Ceramic mandrel and rotary joint

Abstract

The utility model discloses a ceramic mandrel and a rotary joint, and relates to the technical field of rotary joints. The shaft sleeve is made of a ceramic material and is coaxially arranged on the outer side of the mandrel body in a sleeving manner; and the limiting pieces are correspondingly arranged on the mandrel body and the shaft sleeve and used for limiting the shaft sleeve. The ceramic shaft sleeve is sleeved on the outer side of the core shaft body, so that the abrasion resistance of the core shaft body is effectively improved, and the service life of the core shaft body and the service life of the rotary joint are prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary joints, in particular to a ceramic core shaft and a rotary joint. Background Art

[0002] The rotary joint is a mechanical sealing device, which is mainly used to connect fixed pipelines and rotating equipment, and can play the role of conveying mud medium. At present, the alloy steel used in the core shaft of the rotary joint is not wear-resistant during use, and is easy to leak mud, and the reliability is not high. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the disadvantages of the prior art and provide a ceramic mandrel and a rotary joint.

[0004] In order to solve the above technical problems, the technical solution of the utility model is as follows:

[0005] A ceramic mandrel, comprising:

[0006] mandrel body;

[0007] The shaft sleeve is made of ceramic material and is coaxially arranged on the outside of the mandrel body;

[0008] The limiting member is correspondingly arranged on the mandrel body and the shaft sleeve, and is used to limit the shaft sleeve;

[0009] Among them, the limiting member includes a first limiting hole opened on the side of the core shaft body, a second limiting hole opened on the side of the sleeve, and a limiting pin; the axes of the first limiting hole and the second limiting hole are perpendicular to the axis of the core shaft body, and the first limiting hole is aligned with the second limiting hole, and the limiting pin is passed through the first limiting hole and the second limiting hole; a third limiting hole is opened in the side wall of the core shaft body, the axis of the third limiting hole is parallel to the axis of the core shaft body, and one end of the third limiting hole is connected to the side of the first limiting hole; an elastic pin is arranged on one side of the limiting pin, and the contraction direction of the elastic pin is parallel to the axis direction of the third limiting hole;

[0010] When the limiting pin is inserted into the first limiting hole and the second limiting hole, the elastic pin extends into the third limiting hole.

[0011] As a preferred solution of the ceramic core shaft of the utility model, wherein: two first limiting holes and two second limiting holes are provided, and the axes of the two first limiting holes coincide.

[0012] As a preferred solution of the ceramic mandrel of the utility model, the limiting member further comprises a limiting block fixedly arranged on the outside of the mandrel body and a limiting groove opened on the side of the sleeve, and the limiting groove extends from one end of the sleeve to the other end;

[0013] When the shaft sleeve is sleeved on the outer side of the core shaft body, the limiting block is located in the limiting groove, and the first limiting hole is aligned with the second limiting hole.

[0014] As a preferred solution of the ceramic core shaft of the utility model, wherein: the limiting groove includes a first groove body and a second groove body, the cross-section of the first groove body is rectangular, the cross-section of the second groove body is semicircular, and the diameter of the semicircle is equal to the width of the rectangle, one end of the first groove body is flush with one end of the sleeve, and the other end of the first groove body is connected to the second groove body.

[0015] As a preferred solution of the ceramic mandrel of the utility model, two limiting grooves are provided on the side of the shaft sleeve, and the two limiting grooves are located on two opposite sides of the shaft sleeve.

[0016] As a preferred solution of the ceramic mandrel of the utility model, an annular groove for sleeve sleeve is provided on the outer side of the mandrel body, and the thickness of the annular groove is equal to the thickness of the sleeve.

[0017] As a preferred solution of the ceramic mandrel of the utility model, the outer side surface of the mandrel body in contact with the shaft sleeve and the inner side surface of the shaft sleeve are coated with sealing glue.

[0018] The utility model also provides a rotary joint, comprising:

[0019] case;

[0020] A rotating shaft is rotatably mounted in the housing through a bearing;

[0021] A ceramic mandrel as in any one of the above items, coaxially disposed within the rotating shaft;

[0022] A sealing assembly is arranged between the rotating shaft and the ceramic core shaft;

[0023] A first end cover, mounted on the end of the housing by bolts;

[0024] The second end cover is mounted on the end of the rotating shaft by bolts.

[0025] The beneficial effects of the utility model are:

[0026] (1) The utility model effectively improves the wear resistance of the mandrel body by sleeve-arranging a ceramic sleeve on the outer side of the mandrel body, thereby extending the service life of the mandrel body and the rotary joint.

[0027] (2) The utility model has a first limiting hole on the side wall of the mandrel body and a second limiting hole on the side wall of the sleeve. When the sleeve is completely sleeved on the outside of the mandrel body, the first limiting hole and the second limiting hole can be aligned by rotating the sleeve. At this time, the limiting pin is inserted into the aligned first limiting hole and the second limiting hole to achieve the limiting between the sleeve and the mandrel body.

[0028] (3) The utility model also has a third limiting hole in the side wall of the mandrel body. At the same time, an elastic pin is provided on one side of the limiting pin. When the limiting pin is inserted into the aligned first limiting hole and the second limiting hole, the elastic pin is squeezed by the second limiting hole and the first limiting hole and is first in a contracted state until the elastic pin is aligned with the third limiting hole. At this time, the elastic pin automatically pops out and extends into the third limiting hole, realizing the automatic positioning of the limiting pin and ensuring the installation stability of the limiting pin.

[0029] (4) The utility model also provides a limit block on the side wall of the mandrel body and a limit groove on the side wall of the sleeve. The cooperation between the limit block and the limit groove not only prevents the sleeve from rotating relative to the outside of the mandrel body, but also realizes the pre-positioning of the first limit hole and the second limit hole.

[0030] (5) The limit groove in the utility model includes a first groove body and a second groove body, and the cross section of the first groove body is rectangular, and the cross section of the second groove body is semicircular. One end of the first groove body is flush with one end of the sleeve, and the other end of the first groove body is butted against the second groove body. The cross-sectional shape of the limit block is the same as the cross-sectional shape of the limit groove. In this way, when the sleeve is sleeved on the outer side of the core shaft body, the arc-shaped portion at one end of the limit block can be used as a guide portion to guide the butt joint between the limit groove and the limit block. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0032] Figure 1 A cross-sectional schematic diagram of a ceramic mandrel provided by the utility model;

[0033] Figure 2 A front view of the ceramic mandrel provided by the utility model;

[0034] Figure 3 A schematic diagram of the structure of the rotary joint provided by the utility model;

[0035] Among them: 1. core shaft body; 2. sleeve; 3. first limit hole; 4. second limit hole; 5. limit pin; 6. third limit hole; 7. elastic pin; 8. limit block; 9. limit groove; 10. annular groove; 11. shell; 12. rotating shaft; 13. sealing assembly; 14. first end cover; 15. second end cover; 16. bolt; 17. ceramic core shaft; 18. bearing. DETAILED DESCRIPTION

[0036] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below according to specific implementation methods and in combination with the accompanying drawings.

[0037] Figure 1 A schematic diagram of the structure of a ceramic mandrel provided in an embodiment of the present application. The device comprises a mandrel body 1, a sleeve 2 and a stopper. The sleeve 2 and the shaft sleeve 2 are arranged on the outside of the mandrel body 1, and the stopper is used to limit the sleeve 2 to prevent the sleeve 2 from rotating or falling off outside the mandrel body 1.

[0038] For details, see Figure 1 The mandrel body 1 is generally a hollow cylindrical structure, and one end of the mandrel body is provided with an annular flange as a connection end for connecting a water pipe. An annular groove 10 is provided on the outer side of the mandrel body 1, and the axis of the annular groove 10 coincides with the axis of the mandrel body 1. The annular groove 10 serves as a mounting groove for the shaft sleeve 2.

[0039] The sleeve 2 is in a hollow cylindrical shape and is arranged at the mounting groove on the outside of the mandrel body 1. The thickness of the sleeve 2 is equal to the thickness of the mounting groove on the outside of the mandrel body 1, so that when the sleeve 2 is installed on the outside of the mandrel body 1, the outer side of the sleeve 2 is flush with the outer side of the mandrel body 1.

[0040] It should be noted that the sleeve 2 is made of ceramic material. By sleeved with a highly wear-resistant ceramic sleeve 2 on the outer side of the mandrel body 1, the wear resistance of the mandrel body 1 is effectively improved, thereby extending the service life of the mandrel body 1 and the rotary joint.

[0041] The limiting member includes two first limiting holes 3 formed on the side wall of the mandrel body 1, two second limiting holes 4 formed on the side wall of the sleeve 2, and two limiting pins 5. Figure 1 , the axes of the first limiting hole 3 and the second limiting hole 4 are perpendicular to the axis of the core shaft body 1. The first limiting hole 3 extends inward from the outer wall of the core shaft body 1 by a certain distance. The second limiting hole 4 passes through the side wall where the sleeve 2 is located along the thickness direction of the sleeve 2. When the sleeve 2 is completely sleeved on the outside of the core shaft body 1, the first limiting hole 3 and the second limiting hole 4 can be aligned by rotating the shaft 12 sleeve 2. At this time, the limiting between the sleeve 2 and the core shaft body 1 can be achieved by inserting the limiting pin 5 into the aligned first limiting hole 3 and the second limiting hole 4.

[0042] See also Figure 1 The two first limiting holes 3 are respectively located on opposite sides of the mandrel body 1, and the axes of the two first limiting holes 3 coincide with each other. By penetrating the two limiting pins 5, the installation stability between the sleeve 2 and the mandrel body 1 is further improved.

[0043] Preferably, in order to ensure the installation stability of the limit pin 5, a third limit hole 6 is further provided in the side wall of the mandrel body 1. Figure 1 The axis of the third limiting hole 6 is parallel to the axis of the mandrel body 1, that is, the axis of the third limiting hole 6 is perpendicular to the axis of the first limiting hole 3. The left end of the third limiting hole 6 is connected to the right side of the first limiting hole 3. At the same time, an elastic pin 7 is provided on one side of the limiting pin 5, and the contraction direction of the elastic pin 7 is parallel to the axis direction of the third limiting hole 6, that is, perpendicular to the axis direction of the limiting pin 5.

[0044] It should be noted that the diameter of the stop pin 5 is slightly smaller than the diameter of the first stop hole 3 and the second stop hole 4. During the insertion of the stop pin 5 into the aligned first stop hole 3 and the second stop hole 4, the elastic pin 7 is squeezed by the second stop hole 4 and the first stop hole 3 and is first in a contracted state until the elastic pin 7 is aligned with the third stop hole 6. At this time, the elastic pin 7 automatically pops out and extends into the third stop hole 6, realizing the automatic positioning of the stop pin 5 and ensuring the installation stability of the stop pin 5.

[0045] In this embodiment, the outer side surface of the core shaft body 1 in contact with the shaft sleeve 2 and the inner side surface of the shaft sleeve 2 are coated with sealing glue to further ensure the installation stability between the core shaft body 1 and the shaft sleeve 2.

[0046] See also Figure 2 The limiting member also includes a limiting block 8 fixedly mounted on the annular groove 10 of the core shaft body 1 and a limiting groove 9 provided on the side wall of the sleeve 2. The limiting block 8 is located at one end of the annular groove 10 adjacent to the annular flange on the core shaft body 1. The limiting groove 9 extends from one end of the sleeve 2 to the other end. When the sleeve 2 is sleeved on the outside of the core shaft body 1, the limiting block 8 is located in the limiting groove 9, and the first limiting hole 3 is aligned with the second limiting hole 4. The cooperation between the limiting block 8 and the limiting groove 9 not only prevents the sleeve 2 from rotating relative to the outside of the core shaft body 1, but also realizes the pre-positioning of the first limiting hole 3 and the second limiting hole 4.

[0047] In this embodiment, the limiting groove 9 includes a first groove body and a second groove body. The cross-section of the first groove body is rectangular, the cross-section of the second groove body is semicircular, and the diameter of the semicircle is equal to the width of the rectangle. One end of the first groove body is flush with one end of the sleeve 2, and the other end of the first groove body is docked with the second groove body. Correspondingly, the cross-sectional shape of the limiting block 8 is the same as the cross-sectional shape of the limiting groove 9. In this way, in the process of the sleeve 2 being sleeved on the outside of the core shaft body 1, the arc portion at one end of the limiting block 8 can be used as a guide portion to guide the docking of the limiting groove 9 and the limiting block 8.

[0048] Preferably, two limiting grooves 9 are provided on the side of the sleeve 2, and the two limiting grooves 9 are located on opposite sides of the sleeve 2. Correspondingly, two limiting grooves 9 are fixedly provided on the outer side of the mandrel body 1. Through the cooperation of the two groups of limiting grooves 9 and the limiting blocks 8, the installation stability of the sleeve 2 and the mandrel body 1 is further improved.

[0049] See also Figure 3 , the embodiment of the present application also provides a rotary joint. The rotary joint includes a shell 11, a rotating shaft 12, a ceramic core shaft 17, a sealing assembly 13, a first end cover 14 and a second end cover 15. Among them. The rotating shaft 12 is rotatably installed in the shell 11 through a bearing 18. The ceramic core shaft 17 is the ceramic core shaft 17 provided above, which is coaxially arranged in the rotating shaft 12. The sealing assembly 13 is arranged between the rotating shaft 12 and the ceramic core shaft 17. The first end cover 14 is installed at the end of the shell 11 by bolts 16. The second end cover 15 is installed at the end of the rotating shaft 12 by bolts 16.

[0050] Therefore, the technical solution of the present application effectively improves the wear resistance of the mandrel body 1 by sleeve-mounting the ceramic sleeve 2 on the outside of the mandrel body 1, thereby extending the service life of the mandrel body 1 and the rotary joint. At the same time, by setting a limiter, the sleeve 2 and the mandrel body 1 are prevented from rotating relative to each other, thereby ensuring the installation stability between the sleeve 2 and the mandrel body 1.

[0051] In addition to the above embodiments, the present invention may also have other implementation modes; any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the protection scope required by the present invention.

Claims

1. A ceramic mandrel, characterized in that: include: Mandrel body (1); The shaft sleeve (2) is made of ceramic material and is arranged on the outer side of the core shaft body (1); A limiting member, which is correspondingly arranged on the spindle body (1) and the shaft sleeve (2) and is used to limit the position of the shaft sleeve (2); Wherein, the limiting member comprises a first limiting hole (3) provided on the side of the spindle body (1), a second limiting hole (4) provided on the side of the sleeve (2), and a limiting pin (5); the axes of the first limiting hole (3) and the second limiting hole (4) are perpendicular to the axis of the spindle body (1), and the first limiting hole (3) is aligned with the second limiting hole (4), and the limiting pin (5) is passed through the first limiting hole (3) and the second limiting hole (4); a third limiting hole (6) is provided in the side wall of the spindle body (1), the axis of the third limiting hole (6) is parallel to the axis of the spindle body (1), and one end of the third limiting hole (6) is connected to the side of the first limiting hole (3); an elastic pin (7) is provided on one side of the limiting pin (5), and the contraction direction of the elastic pin (7) is parallel to the axis direction of the third limiting hole (6); When the limiting pin (5) is inserted into the first limiting hole (3) and the second limiting hole (4), the elastic pin (7) extends into the third limiting hole (6).

2. The ceramic mandrel according to claim 1, characterized in that: Two of the first limiting holes (3) and two of the second limiting holes (4) are provided, and the axes of the two first limiting holes (3) coincide with each other.

3. The ceramic mandrel according to claim 1, characterized in that: The limiting member further comprises a limiting block (8) fixedly arranged on the outside of the spindle body (1) and a limiting groove (9) provided on the side of the shaft sleeve (2), wherein the limiting groove (9) extends from one end of the shaft sleeve (2) to the other end; When the shaft sleeve (2) is sleeved on the outer side of the spindle body (1), the limiting block (8) is located in the limiting groove (9), and the first limiting hole (3) is aligned with the second limiting hole (4).

4. The ceramic mandrel according to claim 3, characterized in that: The limiting groove (9) comprises a first groove body and a second groove body, the cross-section of the first groove body is rectangular, the cross-section of the second groove body is semicircular, and the diameter of the semicircle is equal to the width of the rectangle, one end of the first groove body is flush with one end of the shaft sleeve (2), and the other end of the first groove body is butted against the second groove body.

5. The ceramic mandrel according to claim 3, characterized in that: Two limiting grooves (9) are provided on the side surface of the shaft sleeve (2), and the two limiting grooves (9) are located on two opposite sides of the shaft sleeve (2).

6. The ceramic mandrel according to claim 1, characterized in that: An annular groove (10) for the sleeve (2) to be sleeved is provided on the outer side of the core shaft body (1), and the thickness of the annular groove (10) is equal to the thickness of the sleeve (2).

7. The ceramic mandrel according to claim 1, characterized in that: The outer side surface of the core shaft body (1) in contact with the shaft sleeve (2) and the inner side surface of the shaft sleeve (2) are both coated with sealing glue.

8. A rotary joint, characterized in that: include: Housing (11); A rotating shaft (12) is rotatably mounted in the housing (11) via a bearing (18); The ceramic mandrel (17) according to any one of claims 1 to 7, coaxially arranged in the rotating shaft (12); A sealing assembly (13) is arranged between the rotating shaft (12) and the ceramic core shaft (17); A first end cover (14) mounted on an end of the housing (11) by means of bolts (16); The second end cover (15) is mounted on the end of the rotating shaft (12) by means of bolts (16).

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