Multi-conical-surface sealed rotary joint

Abstract

The invention provides a multi-conical-surface sealing rotary joint, relates to the technical field of joint sealing, and adopts the scheme that the multi-conical-surface sealing rotary joint comprises a tubular shell, a static sealing ring and a movable sealing ring are arranged in the shell in the axial direction of the shell, and at least two conical bosses are arranged on the side, close to the movable sealing ring, of the static sealing ring; the side, close to the static sealing ring, of the movable sealing ring is provided with a conical groove matched with the conical boss, and the side, away from the movable sealing ring, of the static sealing ring is connected with a jacking assembly. The rotary joint has the advantages that the sealing pressure and the working pressure of the rotary joint can be improved, a sealing piece is not prone to abrasion or leakage, and the service life can be prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of joint sealing, and in particular to a rotary joint with multi-conical surface sealing. Background Art

[0002] In order to make more efficient use of solar energy, all trough solar collectors on the market are equipped with tracking functions. Trough solar collectors use a heat collecting trough to reflect sunlight, focus the sunlight into a line, and set a focusing tube at the focusing line to collect heat energy. The focusing tube is a hollow pipe, which is connected in series with the external pipe to form a heat conduction loop, and a heat transfer medium circulates inside. The heat collecting trough needs to rotate with the angle of sunlight, so the joint between the heat collecting trough body and the supporting component needs to have a rotation function, and the joint also needs to be connected to the focusing tube to conduct the heat transfer medium, and the sealing function needs to be guaranteed. Therefore, the rotary joint is a relatively complex and important component in the trough solar collector product.

[0003] In the prior art, a rotary joint usually consists of a fixed mandrel and a rotating outer ring arranged on the fixed mandrel. The fixed mandrel adopts a hollow metal tube, which is connected to the energy-gathering tube to form a heat conduction circuit. The rotating outer ring is connected to the solar collector tank and rotates with the tank. Since no sealing measures are adopted between the fixed mandrel and the rotating outer ring, the outside air of the tank can easily enter the heat collector tank cavity, affecting the performance of the collector; in addition, as the temperature rises, the rotating outer ring and the mandrel are heated and easily get stuck. For this reason, the development of a rotary joint with multi-conical surface sealing for high temperature and high pressure environment is an urgent problem to be solved. Summary of the invention

[0004] The purpose of the present invention is to propose and design a rotary joint with multi-conical surface sealing, in order to solve the problems that the existing trough type solar collector rotary joint has poor sealing performance and the outside air enters and affects the performance of the collector trough cavity. The rotary joint can improve the sealing pressure and working pressure of the rotary joint, the sealing part is not easy to wear and leak, and the service life can be extended.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: a rotary joint with multi-conical surface seals, including a tubular shell, in which a static sealing ring and a dynamic sealing ring are arranged along the axial direction of the shell, a conical boss is arranged on the side of the static sealing ring close to the dynamic sealing ring, at least two conical bosses are arranged, a conical groove adapted to the conical boss is arranged on the side of the dynamic sealing ring close to the static sealing ring, and a top pressure assembly is connected to the side of the static sealing ring away from the dynamic sealing ring. The static sealing ring is processed with multiple conical bosses, and correspondingly, the dynamic sealing ring is processed with multiple conical grooves. When working, the conical boss of the static sealing ring relies on the top pressure of the top pressure component to be in close contact with the conical groove of the dynamic sealing ring, thereby achieving good sealing performance. Moreover, because it is set in a conical shape, it has a self-positioning function, which facilitates the conical boss to accurately fit into the conical groove. Dust generated by friction during the insertion process will also automatically fall due to the conical surface and fall into the sealing cavity between the dynamic sealing groove and the static sealing groove, thereby preventing dust from damaging the friction surfaces of the dynamic sealing ring and the static sealing ring, thereby extending the service life of the two sealing rings. In addition, the static sealing ring is provided with at least two conical bosses, and the dynamic sealing ring has a prefabricated corresponding number of conical grooves. The conical surface is used for the sealing of the rotary joint, and multiple sealing levels form a redundant sealing function. Even if one sealing cone surface leaks, the remaining sealing cone surfaces can still substitute to achieve the sealing function, thereby ensuring the sealing performance of the rotary joint.

[0006] Furthermore, a chip ring groove is provided in the dynamic seal ring, the chip ring groove is located at the groove bottom of the conical groove, and the chip ring groove is connected to the conical groove. Dust generated by friction is accumulated in the chip ring groove of the dynamic seal ring, and further measures are taken to prevent dust from damaging the sealing cone surface, thereby extending the service life of the dynamic seal ring and the static seal ring.

[0007] Furthermore, a front cover is provided in the housing, and the top pressure assembly is provided between the front cover and the static sealing ring. A connecting pipe is installed on the front cover, and the connecting pipe runs through the inner surface of the front cover to transport the high-temperature medium heated by the concentrated energy to the stationary equipment.

[0008] Furthermore, the front end cover is fixedly connected to the housing, and welding is adopted in this solution. The front end cover can provide a supporting force for the pressing assembly, so that the pressing assembly applies a pressing force to the static sealing ring on the other side.

[0009] Furthermore, the pressing assembly includes a metal elastic element and a sealing ring seat, the static sealing ring is installed on the sealing ring seat, the outer wall of the sealing ring seat is in contact with the inner wall of the housing, and the metal elastic element is connected to the sealing ring seat. When the static sealing ring moves axially, the sealing ring seat provides an axial guide for it, so that the axial movement of the static sealing ring is more stable, and the elastic force of the metal elastic element is the driving force for the axial movement of the static sealing ring. Specifically, the metal elastic element acts on the sealing ring seat and can give the sealing ring seat a pressing force, and the sealing ring seat drives the static sealing ring to move toward the dynamic sealing ring, so that the static sealing ring and the dynamic sealing ring are closely matched.

[0010] Furthermore, the sealing ring seat and the front end cover are both provided with a component installation groove, the end of the elastic element is inserted into the component installation groove and abuts against the side wall of the component installation groove, one end of the elastic element is welded and fixed to the sealing ring seat, and the other end of the elastic element is welded and fixed to the front end cover. By providing the component installation groove, it is convenient to limit the elastic element, and the end of the elastic element abuts against the side wall of the component installation groove, and the elastic element can be staggered and welded inside and outside during welding, so that the fixation is more reliable.

[0011] Furthermore, a front guide sleeve is provided between the outer wall of the dynamic sealing ring and the inner wall of the shell, and the front guide sleeve is engaged with the dynamic sealing ring. Furthermore, a rear end cover is provided in the shell, and the rear end cover is fixedly connected to the shell, and welding is adopted in this scheme. An outer tube is installed on the rear end cover, and the outer tube passes through the rear end cover and is connected to the dynamic sealing ring. The outer side of the outer tube is connected to the solar collector energy concentrator tube. A rear guide sleeve is provided between the rear end cover and the outer tube. Both the front guide sleeve and the rear guide sleeve are made of wear-resistant ceramic materials with high strength and good wear resistance. When the rotary joint is working, the dynamic sealing ring can not only withstand the pressure applied by the static sealing ring, but also ensure that the axial position of the outer tube remains unchanged, and can rotate and swing with the connected solar collector energy concentrator tube to realize the heat transfer medium from the rotating and swinging pipeline to the stationary equipment.

[0012] It can be seen from the above technical solutions that the present invention has the following advantages: This scheme provides a rotary joint with multi-conical surface seal, including a front cover, a shell and a rear cover, the front cover and the rear cover are respectively installed at the two ends of the shell, the inner surface of the front cover is penetrated by a connecting pipe, which is used to transport the high-temperature medium heated by energy collection to the stationary equipment, the inner surface of the rear cover is penetrated by an outer tube and extends into the shell, connected with the dynamic sealing ring as a whole, and the outer side is connected to the solar collector energy collection tube. A combined metal elastic element is welded between the front cover and the sealing ring seat inside the shell, wherein the static sealing ring is installed in the sealing ring seat, and the metal elastic element pushes the static sealing ring to always be close to the dynamic sealing ring, and the dynamic sealing ring is ensured by the front guide sleeve and the rear guide sleeve to ensure axial positioning in the shell, and realizes the sealing function with the static sealing ring. The static sealing ring is processed with a plurality of conical bosses, and in contrast, the dynamic sealing ring is processed with a plurality of conical grooves. When working, the conical boss of the static sealing ring relies on the elastic force of the metal elastic element to be in close contact with the conical groove of the dynamic sealing ring, so as to achieve good sealing performance. In order to deal with the dust problem caused by the friction between the dynamic sealing ring and the static sealing ring, a chip ring groove is specially processed at the bottom of the conical groove of the dynamic sealing ring, so that the dust generated by the friction accumulates in the chip ring groove of the dynamic sealing ring, and because of the conical structure, the dust can also automatically fall into the closed cavity of the two sealing rings, preventing the dust from further damaging the friction surfaces of the two sealing rings, thereby extending the service life of the sealing ring. In this solution, the dynamic sealing ring and the static sealing ring have a total of four combined cone surfaces used for the sealing of the rotary joint. Multiple sealing levels form a redundant sealing function. Even if one sealing surface leaks, the other three sealing surfaces can still substitute to achieve the sealing function, so that the sealing performance of the rotary joint is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0014] Figure 1 It is a structural schematic diagram of a specific implementation mode of the present invention.

[0015] In the figure, 1, connecting pipe, 2, front end cover, 3, metal elastic element, 4, shell, 5, sealing ring seat, 6, static sealing ring, 7, front guide sleeve, 8, dynamic sealing ring, 9, rear guide sleeve, 10, rear end cover, 11, outer tube. DETAILED DESCRIPTION

[0016] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in this specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0017] like Figure 1 As shown, this specific embodiment provides a rotary joint with multi-conical surface seals, including a tubular shell 4, with a front end cover 2 and a rear end cover 10 respectively installed at both ends of the shell 4, a static sealing ring 6 and a dynamic sealing ring 8 are arranged in the shell 4 along its axial direction, a conical boss is arranged on the side of the static sealing ring 6 close to the dynamic sealing ring 8, at least two conical bosses are arranged, a conical groove adapted to the conical boss is arranged on the side of the dynamic sealing ring 8 close to the static sealing ring 6, and a top pressure assembly is connected to the side of the static sealing ring 6 away from the dynamic sealing ring 8.

[0018] The dynamic sealing ring 8 is provided with a chip ring groove, which is located at the groove bottom of the conical groove, and is communicated with the conical groove.

[0019] Among them, the top pressure assembly is arranged between the front end cover 2 and the static sealing ring 6. A connecting pipe 1 is installed on the front end cover 2, and the connecting pipe 1 passes through the inner surface of the front end cover 2, and is used to transport the high-temperature medium of energy-concentrating heating to the stationary equipment. The front end cover 2 is fixedly connected to the shell 4. Welding is adopted in this scheme. The front end cover 2 can provide a supporting force for the top pressure assembly, so that the top pressure assembly applies a top pressure to the static sealing ring 6 on the other side. The top pressure assembly includes a metal elastic element 3 and a sealing ring seat 5. The static sealing ring 6 is installed on the sealing ring seat 5. The outer wall of the sealing ring seat 5 fits with the inner wall of the shell 4, and the metal elastic element 3 is connected to the sealing ring seat 5. When the static sealing ring 6 moves axially, the sealing ring seat 5 provides an axial guide for it, making the axial movement of the static sealing ring 6 more stable. The elastic force of the metal elastic element 3 is the driving force for the axial movement of the static sealing ring 6. Specifically, the metal elastic element 3 acts on the sealing ring seat 5, which can give the sealing ring seat 5 a top pressure. The sealing ring seat 5 drives the static sealing ring 6 to move toward the dynamic sealing ring 8, so that the static sealing ring 6 and the dynamic sealing ring 8 are closely matched. The sealing ring seat 5 and the front end cover 2 are both provided with element mounting grooves. The end of the elastic element is stuck in the element mounting groove and abuts against the side wall of the element mounting groove. One end of the elastic element is welded and fixed to the sealing ring seat 5, and the other end of the elastic element is welded and fixed to the front end cover 2. By setting the element mounting groove, it is convenient to limit the elastic element, and the end of the elastic element abuts against the side wall of the element mounting groove. During welding, the elastic element can be staggered inside and outside, and the fixation is more reliable.

[0020] In addition, a front guide sleeve 7 is provided between the outer wall of the dynamic sealing ring 8 and the inner wall of the shell 4, and the front guide sleeve 7 is engaged with the dynamic sealing ring 8. The rear end cover 10 is fixedly connected to the shell 4, and welding is adopted in this scheme. An outer tube 11 is installed on the rear end cover 10, and the outer tube 11 passes through the rear end cover 10 and is connected to the dynamic sealing ring 8. The outer side of the outer tube 11 is connected to the solar collector energy concentrator tube. A rear guide sleeve 9 is provided between the rear end cover 10 and the outer tube 11. The front guide sleeve 7 and the rear guide sleeve 9 are both made of wear-resistant ceramic materials with high strength and good wear resistance. When the rotary joint is working, the dynamic sealing ring 8 can not only withstand the pressure applied by the static sealing ring 6, but also ensure that the axial position of the outer tube 11 remains unchanged, and can rotate and swing with the connected solar collector energy concentrator tube to realize the heat transfer medium from the rotating and swinging pipeline to the stationary equipment.

[0021] The setting principle is as follows: the inner surface of the front cover 2 is penetrated by a connecting pipe 1, which is used to transport the high-temperature medium heated by energy collection to the stationary equipment; the inner surface of the rear cover 10 is penetrated by an outer pipe 11 and extends into the shell 4, connected to the dynamic sealing ring 8 as a whole, and connected to the solar collector energy collection pipe on the outside. A combined metal elastic element 3 is welded between the front cover 2 and the sealing ring seat 5 inside the shell 4, wherein the static sealing ring 6 is installed in the sealing ring seat 5, and the metal elastic element 3 pushes the static sealing ring 6 to always be close to the dynamic sealing ring 8. The dynamic sealing ring 8 is ensured to be axially positioned in the shell 4 by the front guide sleeve 7 and the rear guide sleeve 9, and realizes the sealing function with the static sealing ring 6. The static sealing ring 6 is processed with a plurality of conical bosses, and in contrast, the dynamic sealing ring 8 is processed with a plurality of conical grooves. When working, the conical boss of the static sealing ring 6 relies on the elastic force of the metal elastic element 3 to be in close contact with the conical groove of the dynamic sealing ring 8, so as to achieve good sealing performance. In order to deal with the dust problem caused by the friction between the dynamic seal ring 8 and the static seal ring 6, a chip ring groove is specially processed at the bottom of the conical groove of the dynamic seal ring 8, so that the dust generated by the friction accumulates in the chip ring groove of the dynamic seal ring 8, and because of the conical structure, the dust can also automatically fall into the closed cavity of the two seal rings, preventing the dust from further damaging the friction surface of the two seal rings, thereby extending the service life of the seal ring. In this solution, the dynamic seal ring 8 and the static seal ring 6 have a total of four combined cone surfaces used for the sealing of the rotary joint. Multiple sealing levels form a redundant sealing function. Even if one sealing surface leaks, the remaining three sealing surfaces can still substitute to achieve the sealing function, so that the sealing performance of the rotary joint is guaranteed.

[0022] The terms "upper", "lower", "outer side", "inner side" and the like (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish the relative relationship in position without giving qualitative description. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal communication of two components, it can be a wireless connection, or it can be a wired connection. For ordinary workers in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rotary joint with multi-conical sealing, comprising a tubular housing, characterized in that: A static sealing ring and a dynamic sealing ring are arranged in the shell along its axial direction. A conical boss is arranged on the side of the static sealing ring close to the dynamic sealing ring, and at least two conical bosses are arranged. A conical groove adapted to the conical boss is arranged on the side of the dynamic sealing ring close to the static sealing ring, and a top pressure assembly is connected to the side of the static sealing ring away from the dynamic sealing ring.

2. The multi-cone sealing rotary joint according to claim 1, characterized in that: A chip ring groove is arranged in the dynamic sealing ring. The chip ring groove is located at the groove bottom of the conical groove. The chip ring groove is communicated with the conical groove.

3. The multi-cone sealing rotary joint according to claim 1, characterized in that: A front end cover is arranged in the shell body, and a top pressure assembly is arranged between the front end cover and the static sealing ring.

4. The multi-cone sealing rotary joint according to claim 3, characterized in that: The front end cover is fixedly connected to the shell.

5. The multi-cone sealing rotary joint according to claim 4, characterized in that: The top pressure assembly comprises a metal elastic element and a sealing ring seat, the static sealing ring is installed on the sealing ring seat, the outer wall of the sealing ring seat is in contact with the inner wall of the shell, and the metal elastic element is connected to the sealing ring seat.

6. The multi-cone sealing rotary joint according to claim 1, characterized in that: The sealing ring seat and the front end cover are both provided with element mounting grooves, the end of the elastic element is stuck in the element mounting groove and abuts against the side wall of the element mounting groove, one end of the elastic element is welded and fixed to the sealing ring seat, and the other end of the elastic element is welded and fixed to the front end cover.

7. The rotary joint with multi-cone seal according to any one of claims 1 to 6, characterized in that: A rear end cover is arranged in the shell body, and the rear end cover is fixedly connected to the shell body.

8. The multi-cone sealing rotary joint according to claim 7, characterized in that: A front guide sleeve is arranged between the outer wall of the dynamic sealing ring and the inner wall of the shell, and the front guide sleeve is engaged with the dynamic sealing ring.

9. The multi-cone sealing rotary joint according to claim 8, characterized in that: An outer tube is installed on the rear end cover, the outer tube penetrates the rear end cover and is connected to the dynamic sealing ring, and a rear guide sleeve is arranged between the rear end cover and the outer tube.

10. The multi-cone sealing rotary joint according to claim 9, characterized in that: The front guide sleeve and the rear guide sleeve are both made of ceramic material.

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