Rotary joint suitable for high-viscosity particle-containing medium

Abstract

The utility model relates to a rotary joint suitable for high-viscosity and particle-containing media, which relates to the field of mechanical sealing and comprises a connecting pipe, and a connecting structure connected with an external pipe fitting is arranged at the position, close to the inlet end, of the connecting pipe. A bearing seat, a first moving ring seat, a static ring seat, a second moving ring seat and a shell are sequentially and detachably mounted on the outer side wall of the connecting pipe in the flow direction of a medium; an atmosphere moving ring and an atmosphere static ring are sequentially installed between the first moving ring seat and the static ring seat in a sealed mode in the flow direction of a medium, and a medium static ring and a medium moving ring are sequentially installed between the static ring seat and the second moving ring seat in a sealed mode in the flow direction of the medium. A blocking and sealing liquid cavity is formed among the static ring base, the atmosphere moving ring, the atmosphere static ring, the medium static ring, the medium moving ring and the outer side wall of the connecting pipe, blocking and sealing liquid circulates in the blocking and sealing liquid cavity, and liquid films are formed between the sealing faces of the atmosphere moving ring and the atmosphere static ring and between the sealing faces of the medium moving ring and the medium static ring. The service life of the rotary joint can be prolonged.

Description

Technical Field

[0001] This application relates to the field of mechanical seals, and in particular to a rotary joint suitable for high-viscosity, particulate media. Background Technology

[0002] Mechanical seals, also known as face seals, consist of a pair of annular parts that are in contact with each other and slide relative to each other. The rotating part during operation is called the rotating ring, and the stationary part is called the stationary ring. During operation, the two end faces of the rotating and stationary rings are kept in contact by the elastic force provided by elastic elements (springs, compression springs, etc.) and the pressure of the medium, so it is also called a dynamic seal.

[0003] In applications involving high-viscosity, particulate media (such as lithium battery slurries, pesticides, paints, inks, ceramic slurries, coatings, etc.), where the media is a highly suspended mixture of solid powder and liquid, mechanical seals are prone to dry running, severe end-face wear, and media leakage during operation. This results in low reliability of the mechanical seals, affecting the service life of the rotary joints, and areas for improvement are available. Utility Model Content

[0004] In order to extend the service life of rotary joints, this application provides a rotary joint suitable for high-viscosity, particulate media.

[0005] The rotary joint provided in this application, suitable for high-viscosity media containing particles, adopts the following technical solution:

[0006] A rotary joint suitable for high-viscosity, particulate media includes a connecting pipe. The connecting pipe has a connection structure for connecting to an outer connecting pipe fitting near its inlet end. A bearing, a bearing housing, a first moving ring housing, a stationary ring housing, a second moving ring housing, and a housing are detachably installed sequentially on the outer wall of the connecting pipe along the flow direction of the media. A bearing is installed between the bearing housing and the connecting pipe. A media liquid cavity for media flow is formed between the housing and the outlet end of the connecting pipe, and a discharge port for media outflow is provided on the housing.

[0007] An atmospheric dynamic ring and an atmospheric static ring are sequentially sealed and installed between the first dynamic ring seat and the static ring seat along the flow direction of the medium. A medium static ring and a medium dynamic ring are sequentially sealed and installed between the static ring seat and the second dynamic ring seat along the flow direction of the medium. A sealing liquid cavity is formed between the static ring seat, the atmospheric dynamic ring, the atmospheric static ring, the medium static ring, the medium dynamic ring, and the outer wall of the connecting pipe. A sealing liquid circulates in the sealing liquid cavity. The pressure of the sealing liquid is greater than the pressure of the medium. Liquid films are formed between the sealing surfaces of the atmospheric dynamic ring and the atmospheric static ring, and between the sealing surfaces of the medium dynamic ring and the medium static ring.

[0008] The stationary ring seat is provided with an inlet and an outlet. The inlet allows the sealing liquid to flow into the sealing liquid chamber, and the outlet allows the sealing liquid to flow out of the sealing liquid chamber. The inlet and outlet are connected to an external circulating cooling system.

[0009] The outer wall of the connector is provided with a flow guiding structure for guiding the circulation of the sealing fluid, and the flow guiding structure is located inside the sealing fluid cavity.

[0010] By adopting the above technical solution, the nozzle is connected to external equipment or fittings through a connecting structure. Pressurized medium flows through the nozzle and then flows out from the outlet on the outer shell. Because the sealing liquid cavity between the outer wall of the nozzle and the inner sides of the stationary ring seat, atmospheric dynamic ring, atmospheric stationary ring, medium stationary ring, and medium dynamic ring is filled with sealing liquid, and the sealing liquid enters between the sealing surfaces of the atmospheric dynamic ring and the atmospheric stationary ring, and between the sealing surfaces of the medium dynamic ring and the medium stationary ring, a liquid film is formed between the sealing surfaces of the atmospheric dynamic ring and the atmospheric stationary ring, and between the sealing surfaces of the medium dynamic ring and the medium stationary ring. This liquid film prevents the sealing end faces of the atmospheric dynamic ring and the atmospheric stationary ring, and between the medium dynamic ring and the medium... The stationary ring's sealing surface is in direct contact and provides lubrication, extending the service life of the rotary joint. Furthermore, because the resistance formed between the fluid's dynamic and static pressures on the sealing surface is greater than the pressure difference between the media on both sides of the sealing surface, the mechanical seal's sealing performance is ensured, achieving the sealing purpose. Since the sealing fluid circulates within the sealing fluid chamber, the sealing fluid flowing out of the outlet can be cooled by the circulating cooling system and then flow back into the sealing fluid chamber through the inlet, effectively dissipating the frictional heat between the sealing surfaces and preventing the liquid film from vaporizing and breaking due to frictional heating. The flow guide structure guides the flow of the sealing fluid within the sealing fluid chamber.

[0011] Preferably, the first moving ring seat is coaxially sleeved on the outer side wall of the connecting pipe, and a first retaining ring is embedded in the outer side wall of the connecting pipe, with the first moving ring seat located between the bearing and the first retaining ring;

[0012] A first annular groove is provided on the outer wall of the connector, and a first sealing ring is embedded in the first annular groove.

[0013] Preferably, a second sealing ring is installed between the atmospheric dynamic ring and the first dynamic ring seat.

[0014] Preferably, a third sealing ring is installed between the atmospheric stationary ring and the stationary ring seat, and the third sealing ring seals between the atmospheric stationary ring and the stationary ring seat.

[0015] Preferably, a fourth sealing ring is installed between the medium stationary ring and the stationary ring seat.

[0016] Preferably, the second rotating ring seat is bolted to the end of the pipe, and a fifth sealing ring is installed between the second rotating ring seat and the medium rotating ring.

[0017] Preferably, a second annular groove is formed on the inner sidewall of the second moving ring seat, and a sixth sealing ring is installed in the second annular groove. The sixth sealing ring abuts against the outer sidewall of the connecting pipe and the inner wall of the second annular groove.

[0018] Preferably, the flow guiding structure includes a flow guiding thread disposed on the outer wall of the pipe, and a flow guiding tube is fixedly installed on the inner side of the stationary ring seat, the flow guiding tube being coaxially sleeved on the outer side of the flow guiding thread.

[0019] Preferably, the connection structure includes a flange integrally formed on the outer wall of the pipe, and the flange has a through hole for the bolt rod to pass through.

[0020] Preferably, a third annular groove is provided on the side of the flange away from the outer casing, and a seventh sealing ring is installed in the third annular groove.

[0021] In summary, the rotary joint of this application suitable for high-viscosity, particulate media has at least one of the following beneficial technical effects:

[0022] 1. The connector is connected to external equipment or fittings via a connecting structure. Pressure carrying the medium flows through the connector and exits through the outlet on the outer casing. The sealing fluid cavity between the outer wall of the connector and the inner sides of the stationary ring seat, atmospheric rotating ring, atmospheric stationary ring, medium stationary ring, and medium rotating ring is filled with sealing fluid. This sealing fluid enters between the sealing surfaces of the atmospheric rotating ring and the atmospheric stationary ring, and between the medium rotating ring and the medium stationary ring, forming a liquid film. This liquid film prevents direct contact between the sealing end faces of the atmospheric rotating ring and the atmospheric stationary ring, and between the medium rotating ring and the medium stationary ring, and also provides lubrication, extending the service life of the rotary joint. Furthermore, because the resistance formed between the fluid dynamic pressure and static pressure at the sealing surfaces is greater than the pressure difference of the medium on both sides of the sealing end face, the sealing performance of the mechanical seal is guaranteed, achieving the sealing purpose.

[0023] 2. Since the sealing fluid circulates in the sealing fluid chamber, the sealing fluid flowing out of the outlet can be cooled by the circulating cooling system and then flow back into the sealing fluid chamber through the inlet. This can promptly dissipate the frictional heat between the sealing surfaces and prevent the liquid film from vaporizing and being destroyed due to frictional heating.

[0024] 3. The flow guiding structure can guide the flow of the sealing liquid in the sealing liquid cavity. Attached Figure Description

[0025] Figure 1 This is a schematic diagram illustrating the internal structure of the rotary joint in an embodiment of this application.

[0026] Figure 2 yes Figure 1The enlarged schematic diagram at point A is mainly used to show the connection structure between the atmospheric dynamic ring, atmospheric static ring, medium static ring, and medium dynamic ring.

[0027] Explanation of reference numerals in the attached drawings: 1. Connecting pipe; 11. Guide thread; 12. First annular groove; 13. First sealing ring; 2. Flange; 21. Through-rod hole; 22. Third annular groove; 23. Seventh sealing ring; 3. Bearing housing; 31. Bearing; 4. First moving ring seat; 41. Atmospheric moving ring; 42. Atmospheric stationary ring; 43. Second sealing ring; 44. Third sealing ring; 5. Stationary ring seat; 51. Guide pipe; 6. Second moving ring seat; 61. Medium stationary ring; 62. Medium moving ring; 63. Fourth sealing ring; 64. Fifth sealing ring; 65. Second annular groove; 66. Sixth sealing ring; 7. Outer shell; 71. Discharge port; 8. Sealing liquid chamber; 81. Liquid inlet; 82. Liquid outlet. Detailed Implementation

[0028] The following combination Figures 1-2 This application will be described in further detail.

[0029] Example 1

[0030] This application discloses a rotary joint suitable for high-viscosity, particulate media. (Refer to...) Figure 1 It mainly includes pipe 1, and the part of pipe 1 near the inlet end is provided with a connection structure for connecting to external equipment or pipe fittings.

[0031] In this embodiment, the connecting structure is a flange 2 integrally formed on the outer wall of the pipe 1, and the flange 2 has multiple through holes 21 for bolt rods to pass through.

[0032] Reference Figure 1 and Figure 2 A bearing housing 3, a first moving ring housing 4, a stationary ring housing 5, a second moving ring housing 6, and a housing 7 are coaxially installed on the outer side of the connector 1 along the axial direction. A bearing 31 is installed between the bearing housing 3 and the connector 1. A medium liquid cavity for medium flow is formed between the housing 7 and the outlet end of the connector 1. A discharge port 71 for medium outflow is opened on the side wall of the housing 7.

[0033] An atmospheric dynamic ring 41 and an atmospheric static ring 42 are sealed between the first dynamic ring seat 4 and the static ring seat 5. A medium static ring 61 and a medium dynamic ring 62 are sealed between the static ring seat 5 and the second dynamic ring seat 6. The atmospheric dynamic ring 41, the atmospheric static ring 42, the medium static ring 61, and the medium dynamic ring 62 are arranged sequentially along the flow direction of the medium in the pipe 1.

[0034] A sealing liquid cavity 8 is formed between the outer wall of the connector 1 and the inner wall of the stationary ring seat 5, the atmospheric moving ring 41, the atmospheric stationary ring 42, the medium stationary ring 61, and the medium moving ring 62. The sealing liquid cavity 8 is filled with sealing liquid, and the pressure of the sealing liquid is greater than the pressure of the medium. A thin layer of liquid film is filled between the sealing surfaces of the atmospheric moving ring 41 and the atmospheric stationary ring 42, and between the sealing surfaces of the medium moving ring 62 and the medium stationary ring 61.

[0035] The side wall of the stationary ring seat 5 is provided with an outlet 82 and an inlet 81. The inlet 81 is used for the inflow of sealing liquid, and the outlet 82 is used for the outflow of sealing liquid. In this embodiment, the inlet 81 is connected to the outlet pipe of the circulating cooling system, and the outlet 82 is connected to the inlet pipe of the circulating cooling system.

[0036] The nozzle 1 is connected to external equipment or pipe fittings through the flange 2. Pressurized medium flows through the nozzle 1 and then flows out through the outlet 71 on the side wall of the housing 7. Since the sealing surfaces of the atmospheric dynamic ring 41 and atmospheric stationary ring 42, and the sealing surfaces of the medium dynamic ring 62 and medium stationary ring 61 are filled with liquid film, the liquid film can prevent the sealing surfaces between the atmospheric stationary ring 42 and atmospheric dynamic ring 41, and between the medium dynamic ring 62 and medium stationary ring 61 from direct contact and dry friction. The liquid film can also play a lubricating role, thereby extending the service life of the mechanical seal of the rotary joint.

[0037] In addition, since the resistance formed between the fluid dynamic pressure and static pressure on the sealing surface is greater than the pressure difference of the medium on both sides of the sealing surface, the sealing performance of the mechanical seal can be guaranteed, thus achieving the purpose of sealing.

[0038] Since the sealing fluid circulates in the sealing fluid chamber 8, the circulating sealing fluid can carry away the frictional heat generated between the sealing surfaces. After cooling, the sealing fluid flows back into the sealing fluid chamber 8, which can effectively reduce the occurrence of vaporization and damage of the liquid film between the sealing surfaces due to frictional heating.

[0039] It should be noted that, in this embodiment, in order to drive the sealing liquid to circulate, a flow guiding structure is provided on the outer wall of the connector 1, and the flow guiding structure is located inside the sealing liquid cavity 8.

[0040] Reference Figure 1 and Figure 2 In this embodiment, the flow guiding structure is a flow guiding thread 11 provided on the outer wall of the pipe 1, and a flow guiding pipe 51 is fixedly installed on the inner side of the stationary ring seat 5. The flow guiding pipe 51 is coaxially sleeved on the outer side of the flow guiding thread 11.

[0041] During the operation of the rotary joint, the pipe 1, bearing, atmospheric moving ring 41, and medium moving ring 62 rotate, while the bearing seat 3, stationary ring seat 5, housing, and guide sleeve remain stationary. During the rotation of the pipe 1, the flow of the sealing fluid can be guided through the thread gap of the guide thread 11, so that the sealing fluid flows to the outlet 82, thereby achieving the technical effect of guiding the sealing fluid to circulate.

[0042] In some other embodiments, depending on the actual needs of use, a circulating pump can also be installed in the pipeline of the circulating cooling system to drive the sealing fluid to circulate, which is not limited or elaborated here.

[0043] Reference Figure 2 In this embodiment, the first moving ring seat 4 is located inside the bearing seat 3, and is coaxially sleeved on the outer wall of the connecting pipe 1. A retaining ring for limiting the first moving ring seat 4 is installed on the connecting pipe 1, and the retaining ring is located on the side of the first moving ring seat 4 away from the bearing. A first annular groove 12 is formed on the outer wall of the connecting pipe 1, and a first sealing ring 13 is installed in the first annular groove 12, sealing the first moving ring seat 4 and the connecting pipe 1.

[0044] The atmospheric moving ring 41 is installed on the first moving ring seat 4, and a second sealing ring 43 is installed between the atmospheric moving ring 41 and the first moving ring seat 4. The second sealing ring 43 seals between the first moving ring seat 4 and the atmospheric moving ring 41, which can prevent the sealing liquid from seeping out from the joint between the first moving ring seat 4 and the atmospheric moving ring 41.

[0045] The stationary ring seat 5 is located between the atmospheric stationary ring 42 and the medium stationary ring 61. A third sealing ring 44 is installed between the atmospheric stationary ring 42 and the stationary ring seat 5, and a fourth sealing ring 63 is installed between the medium stationary ring 61 and the stationary ring seat 5. The third sealing ring 44 can prevent the sealing fluid from seeping out from the joint between the atmospheric stationary ring 42 and the stationary ring seat 5, and the fourth sealing ring 63 can prevent the sealing fluid from seeping out from the joint between the medium stationary ring 61 and the stationary ring seat 5.

[0046] It should be noted that in this embodiment, the elastic element is installed between the atmospheric stationary ring 42 and the medium stationary ring 61. The elastic element causes the sealing surface of the atmospheric stationary ring 42 to fit with the sealing surface of the atmospheric moving ring 41, and at the same time causes the sealing surface of the medium stationary ring 61 to fit with the sealing surface of the medium moving ring 62.

[0047] Please refer to Figure 2 In this embodiment, the second moving ring seat 6 is fixed to the end of the outlet end of the pipe 1 by screws, the medium moving ring 62 is installed on the second moving ring seat 6, and a fifth sealing ring 64 is installed between the second moving ring seat 6 and the medium moving ring 62. The fifth sealing ring 64 seals the joint between the second moving ring seat 6 and the medium moving ring 62, which can prevent the sealing liquid from seeping out from the joint between the second moving ring seat 6 and the medium moving ring 62.

[0048] To improve the sealing effect between the second moving ring seat 6 and the connecting pipe 1, refer to Figure 2 In this embodiment, a second annular groove 65 is provided on the inner sidewall of the second moving ring seat 6, and a sixth sealing ring 66 is installed in the second annular groove 65. The sixth sealing ring 66 abuts against the outer side of the connecting pipe 1 and the inner wall of the second annular groove 65.

[0049] In order to improve the sealing effect of the flange 2 to the external equipment or pipe fittings, in this embodiment of the application, a third annular groove 22 is provided on the side of the flange 2 away from the outer casing 7, and a seventh sealing ring 23 is installed in the third annular groove 22.

[0050] Example 2

[0051] In this embodiment, the connection structure at the inlet end of the pipe 1 is set as an external thread structure, which is connected to external equipment or pipe fittings by means of threaded connection.

[0052] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A rotary joint suitable for high-viscosity, particulate media, characterized in that, The device includes a connecting pipe (1), which has a connection structure for connecting to an outer connecting pipe (1) near the inlet end. The outer wall of the connecting pipe (1) is detachably installed with a bearing seat (3), a first moving ring seat (4), a stationary ring seat (5), a second moving ring seat (6), and a housing (7) in sequence along the flow direction of the medium. A bearing (31) is installed between the bearing seat (3) and the connecting pipe (1). A medium liquid cavity for medium flow is formed between the housing (7) and the outlet end of the connecting pipe (1), and a discharge port (71) for medium to flow out is opened on the housing (7). An atmospheric dynamic ring (41) and an atmospheric static ring (42) are sequentially sealed between the first dynamic ring seat (4) and the static ring seat (5) along the flow direction of the medium. A medium static ring (61) and a medium dynamic ring (62) are sequentially sealed between the static ring seat (5) and the second dynamic ring seat (6) along the flow direction of the medium. A sealing liquid cavity (8) is formed between the static ring seat (5), the atmospheric dynamic ring (41), the atmospheric static ring (42), the medium static ring (61), the medium dynamic ring (62), and the outer wall of the connecting pipe (1). A sealing liquid is circulating in the sealing liquid cavity (8). The pressure of the sealing liquid is greater than the pressure of the medium. A liquid film is formed between the sealing surfaces of the atmospheric dynamic ring (41) and the atmospheric static ring (42) and between the sealing surfaces of the medium dynamic ring (62) and the medium static ring (61). The stationary ring seat (5) is provided with an inlet (81) and an outlet (82). The inlet (81) allows the sealing liquid to flow into the sealing liquid chamber (8), and the outlet (82) allows the sealing liquid to flow out of the sealing liquid chamber (8). The inlet (81) and outlet (82) are connected to an external circulating cooling system. The outer wall of the connector (1) is provided with a flow guiding structure for guiding the circulating flow of the sealing liquid, and the flow guiding structure is located in the sealing liquid cavity (8).

2. The rotary joint according to claim 1, suitable for high-viscosity, particulate media, is characterized in that, The first moving ring seat (4) is coaxially sleeved on the outer side wall of the connecting pipe (1), and a first retaining ring is embedded on the outer side wall of the connecting pipe (1). The first moving ring seat (4) is located between the bearing and the first retaining ring. A first annular groove (12) is provided on the outer wall of the connector (1), and a first sealing ring (13) is embedded in the first annular groove (12).

3. A rotary joint suitable for high-viscosity, particulate media according to claim 2, characterized in that, A second sealing ring (43) is installed between the atmospheric moving ring (41) and the first moving ring seat (4).

4. A rotary joint suitable for high-viscosity, particulate media according to claim 3, characterized in that, A third sealing ring (44) is installed between the atmospheric static ring (42) and the static ring seat (5), and the third sealing ring (44) seals between the atmospheric static ring (42) and the static ring seat (5).

5. A rotary joint suitable for high-viscosity, particulate media according to claim 4, characterized in that, A fourth sealing ring (63) is installed between the medium stationary ring (61) and the stationary ring seat (5).

6. A rotary joint suitable for high-viscosity, particulate media according to claim 5, characterized in that, The second moving ring seat (6) is bolted to the end of the pipe (1), and a fifth sealing ring (64) is installed between the second moving ring seat (6) and the medium moving ring (62).

7. A rotary joint suitable for high-viscosity, particulate media according to claim 6, characterized in that, The second moving ring seat (6) has a second ring groove (65) on its inner side wall. A sixth sealing ring (66) is installed in the second ring groove (65). The sixth sealing ring (66) is pressed between the outer side wall of the pipe (1) and the inner wall of the second ring groove (65).

8. A rotary joint suitable for high-viscosity, particulate media according to claim 7, characterized in that, The flow guiding structure includes a flow guiding thread (11) provided on the outer wall of the pipe (1), and a flow guiding tube (51) is fixedly installed on the inner side of the stationary ring seat (5). The flow guiding tube (51) is coaxially sleeved on the outer side of the flow guiding thread (11).

9. A rotary joint suitable for high-viscosity, particulate media according to claim 1, characterized in that, The connection structure includes a flange (2) integrally formed on the outer wall of the pipe (1), and a through hole (21) for the bolt rod to pass through is provided on the flange (2).

10. A rotary joint suitable for high-viscosity, particulate media according to claim 9, characterized in that, The flange (2) has a third annular groove (22) on the side away from the outer shell (7), and a seventh sealing ring (23) is installed in the third annular groove (22).

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