Rotary joint and negative pressure system
By designing a rotary joint, the upper pressure cap applies downward pressure to the rotary pressure cap, thereby achieving the rotation and sealing of the negative pressure pipe. This solves the problem of loosening or falling off the negative pressure pipe under torsional stress and ensures stable system operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HEILONGJIANG FEIHE DAIRY CO LTD
- Filing Date
- 2025-06-03
- Publication Date
- 2026-04-28
AI Technical Summary
Existing negative pressure pipeline connections are prone to loosening or detachment under torsional stress, affecting the normal operation of the system. In particular, when the equipment layout is complex and the direction of change is reversed, the seals fail, posing a safety hazard.
Design a rotary joint including an upper pressure cap, a lower connector, and a rotating pressure cap. It is sealed with a negative pressure pipe through a sealing element. The upper pressure cap applies downward pressure to the rotating pressure cap to ensure sealing and allows the rotating pressure cap to rotate relative to the upper pressure cap and the lower connector, thereby reducing the impact of torsional stress.
While ensuring a tight seal, the negative pressure pipe can be rotated to prevent loosening or detachment of the connection and ensure stable system operation.
Smart Images
Figure CN224174733U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pipeline connection technology, and in particular to a rotary joint and a negative pressure system. Background Technology
[0002] In many industrial applications, negative pressure conveying systems and equipment rely on negative pressure pipelines for their negative pressure suction function. However, existing negative pressure pipeline connection methods generally suffer from simple structures and limited functionality. Especially when pipelines need to change direction, the connection points are highly susceptible to torsional stress, leading to loosening or even detachment, severely impacting the system's normal operation. For example, in production equipment, negative pressure pipelines often require complex turning connections based on equipment layout, and traditional connection methods frequently result in sealing failures and pipeline detachment. This not only reduces production efficiency but may also create safety hazards. Utility Model Content
[0003] The purpose of this invention is to provide a rotary joint and a negative pressure system that can achieve the rotation of the negative pressure pipe while ensuring the sealing of the joint, thus avoiding the phenomenon of loosening or even falling off of the negative pressure pipe due to torsional stress.
[0004] To achieve the above objectives, this utility model provides the following technical solution:
[0005] In a first aspect, this utility model provides a rotary joint, including an upper pressure cap, a lower joint, and a rotary pressure cap for connecting to a negative pressure pipe.
[0006] The rotating cap is rotatably disposed between the upper cap and the lower connector, and the rotating cap has a sealing element configured to seal with the negative pressure pipe.
[0007] The upper pressure cap is connected to the lower connector. The upper pressure cap is sleeved outside the rotating pressure cap and applies pressure to the rotating pressure cap to press down on the lower connector, so that the seal is pressed onto the lower connector.
[0008] In an optional embodiment, the upper pressure cover includes a cover body, a bearing, and a first elastic element;
[0009] The cover is connected to the lower connector and sleeved on the outside of the rotating pressure cap;
[0010] The bearing is connected to the cover and is located between the cover and the rotating pressure cap;
[0011] The first elastic element is clamped between the cover and the rotating cover to apply a force to the rotating cover to press down the lower connector.
[0012] In an optional embodiment, the cover and the lower connector are connected by a first connector, and the cover is provided with a first connection hole for the first connector to pass through.
[0013] In an optional embodiment, the rotating cap includes an upper slip ring, which has a rotational degree of freedom relative to the upper cap about the axis of the upper cap, and a sliding degree of freedom relative to the upper cap along the axial direction of the upper cap. The sealing member is connected to the upper slip ring and has a gap between the sealing member and the upper slip ring for clamping the end of the negative pressure tube.
[0014] In an optional embodiment, the surface of the upper slip ring facing the lower connector has a mounting groove, and the seal is at least partially installed in the mounting groove, with the side of the portion of the seal located in the mounting groove forming the gap between the upper slip ring and the seal.
[0015] In an optional embodiment, when the upper pressure cap includes a first elastic element that applies the pressure, the surface of the upper slip ring facing the first elastic element is provided with a gasket that contacts the first elastic element.
[0016] In an optional embodiment, the lower connector includes a connector body, a sliding ring, and a sealing ring;
[0017] The connector body is connected to the upper pressure cover, and the surface of the connector body facing the rotating pressure cover has a pressing surface for mating with the sealing element;
[0018] The sliding ring is rotatably engaged with the connector body and a sealing ring is provided between the sliding ring and the connector body.
[0019] In an optional embodiment, the lower connector further includes a second elastic element sandwiched between the connector body and the sliding ring, the second elastic element being configured to apply pressure to the sliding ring to press against the rotating cap.
[0020] In an optional embodiment, when the connector body and the upper pressure cover are connected by a first connector, the connector body is provided with a second connection hole for the first connector to pass through.
[0021] Secondly, this utility model provides a negative pressure system, including a negative pressure pipe and a rotary joint as described in any of the foregoing embodiments, wherein the negative pressure pipe is sandwiched between the rotary cover and the lower joint, and the negative pressure pipe is sealed to the sealing element.
[0022] The rotary joint and negative pressure system provided by this utility model can produce the following beneficial effects:
[0023] In the first aspect of this utility model, when the negative pressure pipe needs to be turned during application, the rotating cap can rotate relative to the upper cap and the lower connector, reducing the torsional stress on the connection between the negative pressure pipe and the rotating cap. Because the sealing element is sealed to the negative pressure pipe, it can prevent gas from entering the negative pressure pipe through the gap between the rotating cap and the negative pressure pipe during use. Under the downward pressure of the upper cap, the sealing element of the rotating cap can be pressed against the lower connector, preventing gas from entering the negative pressure pipe through the gap between the rotating cap and the lower connector. It can achieve the turning of the negative pressure pipe while ensuring the sealing of the joint, and prevent the negative pressure pipe from becoming loose or even falling off due to the torsional stress.
[0024] The negative pressure system provided in the second aspect of this utility model has the rotary joint provided in the first aspect of this utility model, and thus has all the beneficial effects of the rotary joint provided in the first aspect of this utility model. Attached Figure Description
[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0026] Figure 1 A cross-sectional view of a rotary joint connected to a negative pressure pipe, provided for an embodiment of this utility model;
[0027] Figure 2 A cross-sectional view of an upper pressure cap provided for an embodiment of this utility model;
[0028] Figure 3 A cross-sectional view of a rotating cap provided in an embodiment of this utility model;
[0029] Figure 4 A cross-sectional view of a lower connector provided in an embodiment of this utility model;
[0030] Figure 5 This is a schematic diagram of a negative pressure system provided in an embodiment of the present invention.
[0031] Icons: 1-Upper cap; 11-Cap body; 111-First connecting hole; 112-Opening; 12-Bearing; 13-First elastic element; 2-Lower connector; 21-Connector body; 211-Crimping surface; 212-Second connecting hole; 22-Sliding ring; 23-Sealing ring; 24-Second elastic element; 3-Rotating cap; 31-Sealing element; 32-Upper sliding ring; 33-Gasket; 4-Negative pressure pipe; 5-First connector; 6-Base. Detailed Implementation
[0032] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0033] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0035] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.
[0036] The first aspect of this utility model provides a rotary joint, such as Figure 1 As shown, it includes an upper pressure cap 1, a lower connector 2, and a rotating pressure cap 3 for connecting to the negative pressure pipe 4;
[0037] The rotating cover 3 is rotatably disposed between the upper cover 1 and the lower connector 2. The rotating cover 3 has a sealing element 31, which is configured to seal with the negative pressure pipe 4.
[0038] The upper pressure cover 1 is connected to the lower connector 2. The upper pressure cover 1 is sleeved on the outside of the rotating pressure cover 3 and applies pressure to the rotating pressure cover 3 to press the lower connector 2, so that the seal 31 is pressed onto the lower connector 2.
[0039] The rotary joint provided in the first aspect of this utility model, during application, such as Figure 1 As shown, when the negative pressure pipe 4 needs to be turned, since the negative pressure pipe 4 is connected to the rotating cover 3, the negative pressure pipe 4 can drive the rotating cover 3 to rotate relative to the upper cover 1 and the lower connector 2, reducing the torsional stress on the connection between the negative pressure pipe 4 and the rotating cover 3. Since the sealing element 31 is sealed with the negative pressure pipe 4, it can prevent gas from entering the negative pressure pipe 4 from the gap between the rotating cover 3 and the negative pressure pipe 4 during use. Under the downward pressure of the upper cover 1, the sealing element 31 of the lower rotating cover 3 can be pressed against the lower connector 2, which can prevent gas from entering the negative pressure pipe 4 from the gap between the rotating cover 3 and the lower connector 2. While ensuring the sealing at the joint, the negative pressure pipe 4 can be turned, avoiding the phenomenon of loosening or even falling off due to the torsional stress of the negative pressure pipe 4.
[0040] The structure of the upper pressure cover 1 is described in detail below:
[0041] In alternative implementations, such as Figure 1 and Figure 2 As shown, the upper pressure cover 1 includes a cover body 11, a bearing 12, and a first elastic element 13; the cover body 11 is connected to the lower connector 2 and sleeved on the outside of the rotating pressure cover 3, and the cover body 11 has an opening 112 for the negative pressure pipe 4 to pass through; the bearing 12 is connected to the cover body 11 and is located between the cover body 11 and the rotating pressure cover 3, so that the rotating pressure cover 3 rotates more smoothly relative to the cover body 11; the first elastic element 13 is clamped between the cover body 11 and the rotating pressure cover 3 to apply a force to the rotating pressure cover 3 to press down the lower connector 2.
[0042] During assembly, after the cover 11 is connected to the lower connector 2, the first elastic element 13 can apply elastic force to the rotating cover 3. Under the action of the elastic force, the sealing element 31 on the rotating cover 3 is pressed onto the lower connector 2.
[0043] The upper pressure cover 1 in the above embodiment has a simple structure, which not only ensures smoother rotation of the rotating pressure cover 3, but also provides stable downward pressure to the rotating pressure cover 3, ensuring the long-term effectiveness of the rotating joint connection and seal.
[0044] The first elastic element 13 can be a helical spring or a spring sheet, etc.
[0045] In a preferred embodiment, the first elastic element 13 is a helical spring.
[0046] The first elastic element 13 can be configured as one or more. Taking the first elastic element 13 as a helical spring as an example: when the first elastic element 13 is configured as one, the helical spring is sleeved on the cover 11, and the axis of the helical spring coincides with the axis of the cover 11; when the first elastic element 13 is configured as multiple, each helical spring is set in the mounting hole of the cover 11, and each helical spring is evenly distributed around the axis of the cover 11, and applies elastic force to the rotating cover 3 evenly along the circumference of the rotating cover 3.
[0047] The cover 11 and the lower connector 2 can be connected by means of snap-fit, threaded connection, bolt connection, etc.
[0048] In alternative implementations, such as Figure 1 and Figure 2 As shown, the cover 11 is connected to the lower connector 2 by a first connector 5, and the cover 11 is provided with a first connecting hole 111 for the first connector 5 to pass through.
[0049] During installation, the first connector 5 passes through the first connecting hole 111 and connects to the lower connector 2; or the first connector 5 passes through the first connecting hole 111 and the lower connector 2 and connects to the base 6 below the lower connector, thereby enabling the installation of the rotary connector and the base 6.
[0050] The first connecting member 5 can be a pin or a bolt, etc.
[0051] In a preferred embodiment, the first connector 5 is a bolt.
[0052] The first connector 5 can be configured as multiple, and correspondingly, the first connecting hole 111 can be configured as multiple, with the multiple first connecting holes 111 being distributed at equal intervals around the axial direction of the cover 11.
[0053] The structure of the rotating cap 3 is described in detail below:
[0054] In alternative implementations, such as Figure 1 and Figure 3 As shown, the rotating cover 3 includes an upper slip ring 32; the sealing element 31 is connected to the upper slip ring 32 and has a gap between it and the upper slip ring 32 for clamping the end of the negative pressure pipe 4; the upper slip ring 32 has a rotational degree of freedom relative to the upper cover 1 with the axis of the upper cover 1 as the axis, so that when the negative pressure pipe 4 has a rotational tendency, it can drive the upper slip ring 32 to rotate relative to the upper cover 1; the upper slip ring 32 has a sliding degree of freedom relative to the upper cover 1 along the axial direction of the upper cover 1, so that the upper slip ring 32 causes the sealing element 31 to press the lower connector 2 under the downward pressure of the first elastic element 13.
[0055] In the aforementioned rotating cover 3, the sealing element 31 and the upper slip ring 32 can clamp the end of the negative pressure pipe 4, so that the sealing element 31 and the outer ring of the negative pressure pipe 4 are sealed together, ensuring the sealing between the outer ring of the negative pressure pipe 4 and the rotating cover 3.
[0056] In alternative implementations, such as Figure 3 As shown, the upper slip ring 32 has a mounting groove on the surface of the lower connector 2, and the seal 31 is at least partially installed in the mounting groove. A gap is formed between the side of the portion of the seal 31 located in the mounting groove and the upper slip ring 32.
[0057] like Figure 1 As shown, when connecting the negative pressure pipe 4, the end of the negative pressure pipe 4 can be bent from the inner wall of the upper slip ring 32 to the end face of the upper slip ring 32 facing the lower connector 2, and then bent in the direction away from the lower connector 2 to between the seal 31 and the upper slip ring 32, so that while the seal 31 on the upper slip ring 32 is pressing the lower connector 2, the upper slip ring 32 can press the negative pressure pipe 4 on the lower connector 2. In this way, when rotating, the lower connector 2 and the negative pressure pipe 4 can maintain a good seal while rotating relative to each other.
[0058] In an optional embodiment, the negative pressure pipe 4 can be made of metal, and the negative pressure pipe 4 and the metal upper slip ring 32 can be fixedly connected by welding or other means.
[0059] In alternative implementations, such as Figure 3 As shown, when the upper pressure cap 1 includes the first elastic member 13 that applies pressure, the upper slip ring 32 has a gasket 33 on the surface facing the first elastic member 13 that contacts the first elastic member 13.
[0060] The gasket 33 can prevent the first elastic element 13 from directly contacting the upper slip ring 32 and causing friction. The gasket 33 can reduce friction and noise.
[0061] The material of the gasket 33 can be rubber or plastic, etc.
[0062] In a preferred embodiment, the gasket 33 is made of polytetrafluoroethylene.
[0063] In alternative implementations, such as Figure 3 As shown, the gasket 33 is fitted onto the outside of the upper slip ring 32.
[0064] The structure of the lower connector 2 is described in detail below:
[0065] In alternative implementations, such as Figure 1 and Figure 4As shown, the lower connector 2 includes a connector body 21, a lower sliding ring 22, and a sealing ring 23; the connector body 21 is connected to the upper pressure cover 1, and the surface of the connector body 21 facing the rotating pressure cover 3 has a pressing surface 211 for cooperating with the sealing element 31; the lower sliding ring 22 is rotatably engaged with the connector body 21 and a sealing ring 23 is provided between the lower sliding ring 22 and the connector body 21, and the sealing ring 23 allows gas to flow only through the through hole in the middle of the lower sliding ring 22.
[0066] In use, the sealing element 31 is pressed onto the pressing surface 211 under the elastic force of the first elastic element 13, achieving a seal between the rotating cap 3 and the lower connector 2. The upper sliding ring 32, under the elastic force of the first elastic element 13, can press the negative pressure pipe 4 onto the lower sliding ring 22, thus achieving... Figure 1 As shown, the outer side of the contact point between the negative pressure pipe 4 and the lower connector 2 can also be sealed through the contact between the sealing element 31 and the pressing surface 211, resulting in a better sealing effect.
[0067] In alternative implementations, such as Figure 4 As shown, the lower connector 2 also includes a second elastic element 24, which is sandwiched between the connector body 21 and the lower sliding ring 22. The second elastic element 24 is configured to apply pressure of the upper rotating cover 3 to the lower sliding ring 22.
[0068] The second elastic element 24 enables the lower sliding ring 22 to press the upper sliding ring 32 upward, giving the upper sliding ring 32 a reaction force, increasing the pressure between the lower sliding ring 22 and the upper sliding ring 32, and improving the sealing effect between them.
[0069] The second elastic element 24 can be a helical spring or a spring sheet, etc.
[0070] In a preferred embodiment, the second elastic element 24 is a helical spring.
[0071] The second elastic element 24 can be configured as one or multiple. Taking the second elastic element 24 as a helical spring as an example: when the second elastic element 24 is configured as one, the helical spring is sleeved inside the connector body 21, and the axis of the helical spring coincides with the axis of the connector body 21; when the second elastic element 24 is configured as multiple, each helical spring is set in the mounting hole of the connector body 21, and each helical spring is distributed at equal intervals around the axis of the connector body 21.
[0072] In alternative implementations, such as Figure 1 and Figure 4 As shown, when the connector body 21 is connected to the upper pressure cover 1 through the first connector 5, the connector body 21 is provided with a second connection hole 212 for the first connector 5 to pass through.
[0073] During installation, such as Figure 5As shown, the first connector 5 can be connected to the base 6 below the lower connector after passing through the first connecting hole 111 and the second connecting hole 212, so as to realize the installation of the rotary connector and the base 6.
[0074] In addition, such as Figure 4 As shown, the connector body 21 has a screw hole below the second elastic member 24. The screw hole is used to install a fixing screw so that the lower connector 2 is connected to the valve cavity. A sealing gasket is used at the connection to complete the seal.
[0075] A second aspect of this utility model provides a negative pressure system, such as... Figure 1 As shown, the negative pressure system provided by the second aspect of this utility model includes a negative pressure pipe 4 and the above-mentioned rotary joint. The negative pressure pipe 4 is sandwiched between the rotary cover 3 and the lower joint 2, and the negative pressure pipe 4 is sealed with the sealing member 31.
[0076] The negative pressure system provided in the second aspect of this utility model has the rotary joint provided in the first aspect of this utility model, and thus has all the beneficial effects of the rotary joint provided in the first aspect of this utility model.
[0077] The aforementioned negative pressure system can be applied to various mechanical structures that require negative pressure, such as negative pressure manipulators. When the manipulator's suction cup rotates horizontally at any angle, the rotating cover 3 can rotate relative to the upper cover 1 and the lower connector 2, so the negative pressure pipe 4 will not be subjected to torque in the opposite direction. When the pipe turns, it can effectively avoid detachment and leakage problems, ensuring the normal operation of the system.
[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A rotary joint, characterized by Includes an upper pressure cap (1), a lower connector (2), and a rotating pressure cap (3) for connection with a negative pressure pipe (4); The rotating cap (3) is rotatably disposed between the upper cap (1) and the lower connector (2). The rotating cap (3) has a sealing element (31), which is configured to seal with the negative pressure pipe (4). The upper pressure cap (1) is connected to the lower connector (2). The upper pressure cap (1) is sleeved on the outside of the rotating pressure cap (3) and applies pressure to the rotating pressure cap (3) to press down on the lower connector (2) so that the seal (31) is pressed onto the lower connector (2).
2. The rotary joint according to claim 1, characterized in that, The upper cover (1) includes a cover body (11), a bearing (12) and a first elastic element (13); The cover (11) is connected to the lower connector (2) and sleeved on the outside of the rotating pressure cover (3); The bearing (12) is connected to the cover (11) and located between the cover (11) and the rotating cover (3); The first elastic element (13) is sandwiched between the cover (11) and the rotating cover (3) to apply a force to the rotating cover (3) to press down the lower connector (2).
3. The rotary joint according to claim 2, characterized in that, The cover (11) is connected to the lower connector (2) by a first connector (5), and the cover (11) is provided with a first connection hole (111) for the first connector (5) to pass through.
4. The rotary joint according to claim 1, characterized in that, The rotating cap (3) includes an upper slip ring (32), which has a rotational degree of freedom relative to the upper cap (1) with the axis of the upper cap (1) as the axis, and a sliding degree of freedom relative to the upper cap (1) along the axial direction of the upper cap (1). The sealing element (31) is connected to the upper slip ring (32) and has a gap between it and the upper slip ring (32) for clamping the end of the negative pressure tube (4).
5. The rotary joint according to claim 4, characterized in that, The upper slip ring (32) has a mounting groove on the surface facing the lower connector (2), and the seal (31) is at least partially installed in the mounting groove. The gap is formed between the side of the portion of the seal (31) located in the mounting groove and the upper slip ring (32).
6. The rotary joint according to claim 4, characterized in that, When the upper pressure cap (1) includes a first elastic element (13) that applies the pressure, the upper slip ring (32) has a gasket (33) on its surface facing the first elastic element (13) that contacts the first elastic element (13).
7. The rotary joint according to claim 1, characterized in that, The lower connector (2) includes a connector body (21), a lower sliding ring (22), and a sealing ring (23). The connector body (21) is connected to the upper pressure cap (1), and the surface of the connector body (21) facing the rotating pressure cap (3) has a pressing surface (211) for cooperating with the seal (31). The sliding ring (22) is rotatably engaged with the connector body (21) and the sealing ring (23) is provided between the sliding ring (22) and the connector body (21).
8. The rotary joint according to claim 7, characterized in that, The lower connector (2) further includes a second elastic element (24), which is sandwiched between the connector body (21) and the lower sliding ring (22). The second elastic element (24) is configured to apply pressure to the lower sliding ring (22) to press the rotating cap (3).
9. The rotary joint according to claim 7, characterized in that, When the connector body (21) is connected to the upper pressure cover (1) via the first connector (5), the connector body (21) is provided with a second connection hole (212) for the first connector (5) to pass through.
10. A negative pressure system, characterized in that, Includes a negative pressure tube (4) and a rotary joint as described in any one of claims 1-9, wherein the negative pressure tube (4) is sandwiched between the rotary cover (3) and the lower joint (2), and the negative pressure tube (4) is sealed to the sealing element (31).