Rotary sealing structure and pneumatic system with same

Abstract

The utility model provides a rotary sealing structure and a pneumatic system with the rotary sealing structure, the rotary sealing structure is connected with an air cylinder, and the rotary sealing structure comprises a shaft body connected with the air cylinder; a first air inlet channel and a first air outlet channel are formed in the shaft body and communicate with a cylinder body of the air cylinder. The shaft body is sleeved with the sealing component, a second air inlet channel and a second air outlet channel are formed in the sealing component, the second air inlet channel is communicated with the first air inlet channel, and the second air outlet channel is communicated with the first air outlet channel. The problems that in the prior art, a rotary sealing shaft cannot supply air to an air cylinder in the rotating process, the air cylinder needs to be provided with an independent air path, and consequently a pneumatic system is complex in structure are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of pneumatic system sealing, and more specifically, to a rotary sealing structure and a pneumatic system having the same. Background Art

[0002] In a pneumatic system, a cylinder needs to be connected to a rotating component (such as a piston rod). Therefore, a rotary sealing shaft is usually provided at the connection between the cylinder and the rotating component. The rotary sealing shaft can prevent external dust, moisture or other contaminants from entering the cylinder interior, keep the cylinder interior clean, and at the same time can provide dynamic sealing, maintaining the sealing performance even during high-speed rotation or swinging motion.

[0003] In the prior art, since the shaft body rotates continuously and it is impossible to supply air to the rotating cylinder, the cylinder can only be provided with a separate air path, and the rotating shaft only serves as a seal. This not only increases the structural complexity of the pneumatic system, but also occupies a large installation space and increases the cost of the pneumatic system. Summary of the Utility Model

[0004] The main object of the present utility model is to provide a rotary sealing structure and a pneumatic system having the same, so as to solve the problem that the rotary sealing shaft in the prior art cannot supply air to the cylinder during rotation, and the cylinder needs to be provided with a separate air path, resulting in a complex structure of the pneumatic system.

[0005] To achieve the above object, according to one aspect of the present utility model, a rotary sealing structure is provided, which is connected to a cylinder. The rotary sealing structure includes: a shaft body connected to the cylinder; a first air inlet channel and a first air outlet channel are provided in the shaft body, and the first air inlet channel and the first air outlet channel are respectively communicated with the cylinder block; a sealing component sleeved on the shaft body, and a second air inlet channel and a second air outlet channel are provided on the sealing component, the second air inlet channel is communicated with the first air inlet channel, and the second air outlet channel is communicated with the first air outlet channel.

[0006] Further, the rotary sealing structure further includes: a bearing seat sleeved on the shaft body, the bearing seat is connected to the shaft body through a bearing, and the sealing component is located between the bearing seat and the shaft body; a third air inlet channel and a third air outlet channel are provided on the bearing seat, the third air inlet channel is communicated with the second air inlet channel, and the third air outlet channel is communicated with the second air outlet channel.

[0007] Further, the rotary sealing structure further includes: an air inlet switch, at least part of the air inlet switch is arranged in the third air inlet channel, and the position of the air inlet switch is movably arranged to block or avoid the air flow in the third air inlet channel.

[0008] Further, there are a plurality of first intake channels, and the plurality of first intake channels are arranged at intervals in the radial direction or circumferential direction of the shaft body; and / or, there are a plurality of first exhaust channels, and the plurality of first exhaust channels are arranged at intervals in the radial direction or circumferential direction of the shaft body.

[0009] Further, there are a plurality of first intake channels and a plurality of first exhaust channels; there are a plurality of second intake channels, and the plurality of second intake channels are arranged at intervals along the extending direction of the sealing member, and the plurality of second intake channels are arranged in one-to-one correspondence with the plurality of first intake channels; and / or, there are a plurality of second exhaust channels, and the plurality of second exhaust channels are arranged at intervals along the extending direction of the sealing member, and the plurality of second exhaust channels are arranged in one-to-one correspondence with the plurality of first exhaust channels.

[0010] Further, the first intake channel includes: a first intake section, which is communicated with the second intake channel and extends along the radial direction of the shaft body; a second intake section, with both ends of the second intake section being communicated with the first intake section and the cylinder block of the cylinder respectively, and the second intake section extends along the axial direction of the shaft body.

[0011] Further, the first exhaust channel includes: a first exhaust section, which is communicated with the second exhaust channel and extends along the radial direction of the shaft body; a second exhaust section, with both ends of the second exhaust section being communicated with the first exhaust section and the cylinder block of the cylinder respectively, and the second exhaust section extends along the axial direction of the shaft body.

[0012] Further, the sealing member includes: a spacer sleeve, sleeved on the shaft body, and there are a plurality of spacer sleeves, which are arranged at intervals along the axial direction of the shaft body, and the second intake channel and the second exhaust channel are respectively arranged on the spacer sleeve, and the second intake channel and the second exhaust channel respectively extend along the circumferential direction of the spacer sleeve; an intermediate sealing skeleton, sleeved on the shaft body, and two intermediate sealing skeletons are arranged between every two adjacent spacer sleeves.

[0013] Further, a first groove is provided on the intermediate sealing skeleton, and the opening of the first groove faces the spacer sleeve.

[0014] According to another aspect of the present invention, a pneumatic system is provided, which includes a rotary sealing structure and a cylinder, the rotary sealing structure is connected to the cylinder, and the rotary sealing structure is the above-mentioned rotary sealing structure.

[0015] Applying the technical solution of the present utility model, the rotary seal structure includes a shaft body and a seal component. The shaft body is connected to the cylinder. A first intake passage and a first exhaust passage are provided inside the shaft body, and the first intake passage and the first exhaust passage are respectively communicated with the cylinder block of the cylinder. The seal component is sleeved on the shaft body, and a second intake passage and a second exhaust passage are provided on the seal component. The second intake passage is communicated with the first intake passage, and the second exhaust passage is communicated with the first exhaust passage. With such a setting, on the basis that the rotary seal structure can achieve dynamic sealing of the cylinder, by providing the first intake passage and the first exhaust passage on the shaft body, a gas circulation loop is formed with the cylinder block, and the seal component is used to rotate and seal the shaft body. Thus, there is no need to provide a separate gas circuit circulation component for the cylinder, simplifying the structure of the pneumatic system where the rotary seal structure is located and reducing the cost of the pneumatic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The schematic drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0017] Figure 1 shows a schematic structural diagram of an embodiment of the rotary seal structure according to the present utility model;

[0018] Figure 2 shows according to Figure 1 an enlarged view of part A of the rotary seal structure;

[0019] Figure 3 shows according to Figure 1 an enlarged view of part B of the rotary seal structure;

[0020] Figure 4 shows a sectional view taken along the A-A plane of the rotary seal structure according to the present utility model;

[0021] Figure 5 shows a side view of the rotary seal structure according to the present utility model.

[0022] Among them, the above-mentioned drawings include the following reference numerals:

[0023] 1. Shaft body; 10. First intake passage; 101. First intake section; 102. Second intake section; 11. First exhaust passage; 110. First exhaust section; 111. Second exhaust section; 2. Seal component; 20. Second intake passage; 21. Second exhaust passage; 22. Spacer sleeve; 23. Intermediate seal skeleton; 230. First groove; 24. End seal skeleton; 240. Second groove; 3. Bearing housing; 30. Third intake passage; 31. Third exhaust passage; 4. Bearing. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following will refer to the accompanying drawings and combine with the embodiments to detail the present utility model.

[0025] As mentioned in the background art, in the existing pneumatic system, the cylinder is sealed by rotating the sealing shaft to prevent external dust, moisture or other pollutants from entering the cylinder interior. Even when the cylinder is swinging or rotating, the dynamic sealing effect is achieved through the rotating sealing shaft. However, since the rotating sealing shaft only provides a sealing function and the air supply to the cylinder is a separate air path, it increases the complexity of the pneumatic system and occupies the installation space. To solve the above technical problems, the rotating sealing structure provided in this application includes a shaft body 1 connected to the cylinder. A first air inlet passage 10 and a first air outlet passage 11 are provided in the shaft body 1. The first air inlet passage 10 and the first air outlet passage 11 are respectively communicated with the cylinder block. During the rotation of the shaft body 1, air is introduced into the cylinder through the first air inlet passage 10, and then the gas in the cylinder is discharged through the first air outlet passage 11 to form an air path cycle. Further, a sealing member 2 is sleeved on the shaft body 1 to ensure the sealing effect of the shaft body 1. A second air inlet passage 20 and a second air outlet passage 21 are provided on the sealing member 2 to form a gas circulation loop with the first air inlet passage 10 and the first air outlet passage 11, so as to ensure the air supply to the cylinder and the output of the gas in the cylinder, enabling the rotating sealing structure to not only achieve dynamic sealing of the cylinder, but also realize an air path cycle between the shaft body 1 and the cylinder during rotation, without the need to separately set a gas circuit for the cylinder, thus simplifying the structure of the pneumatic system and reducing the cost of the pneumatic system.

[0026] Please refer to Figures 1 to 5 The present utility model provides a rotating sealing structure connected to a cylinder. The rotating sealing structure includes: a shaft body 1 connected to the cylinder; a first air inlet passage 10 and a first air outlet passage 11 are provided in the shaft body 1, and the first air inlet passage 10 and the first air outlet passage 11 are respectively communicated with the cylinder block; a sealing member 2 is sleeved on the shaft body 1, and a second air inlet passage 20 and a second air outlet passage 21 are provided on the sealing member 2. The second air inlet passage 20 is communicated with the first air inlet passage 10, and the second air outlet passage 21 is communicated with the first air outlet passage 11.

[0027] According to the rotary seal structure provided by the present application, it includes a shaft body 1 and a sealing member 2. The shaft body 1 is connected to a cylinder; a first intake passage 10 and a first exhaust passage 11 are provided inside the shaft body 1, and the first intake passage 10 and the first exhaust passage 11 are respectively communicated with the cylinder block of the cylinder; the sealing member 2 is sleeved on the shaft body 1, and a second intake passage 20 and a second exhaust passage 21 are provided on the sealing member 2. The second intake passage 20 is communicated with the first intake passage 10, and the second exhaust passage 21 is communicated with the first exhaust passage 11. With such a setting, on the basis that the rotary seal structure can achieve dynamic sealing of the cylinder, by providing the first intake passage 10 and the first exhaust passage 11 on the shaft body 1, a gas circulation loop is formed between the shaft body 1 and the cylinder block, and the shaft body 1 is rotationally sealed by the sealing member 2, so that there is no need to provide a separate gas circuit circulation component for the cylinder, simplifying the structure of the pneumatic system where the rotary seal structure is located and reducing the cost of the pneumatic system.

[0028] During the specific implementation process, in order to ensure the stability of the shaft body 1, the rotary seal structure further includes: a bearing seat 3, sleeved on the shaft body 1, and the bearing seat 3 is connected to the shaft body 1 through a bearing 4. The sealing member 2 is located between the bearing seat 3 and the shaft body 1; a third intake passage 30 and a third exhaust passage 31 are provided on the bearing seat 3. The third intake passage 30 is communicated with the second intake passage 20, and the third exhaust passage 31 is communicated with the second exhaust passage 21. Among them, the bearing seat 3 is connected to the fixed seat supporting the shaft body 1, and the bearing seat 3 is connected to the shaft body 1 through a bearing 4, enabling the shaft body 1 to rotate relative to the bearing seat 3. Through the sealing member 2, the space between the shaft body 1 and the bearing seat 3 is sealed, so that the third intake passage 30, the second intake passage 20, and the first intake passage 10 are stably communicated. Similarly, the third exhaust passage 31, the second exhaust passage 21, and the first exhaust passage 11 are stably communicated, preventing gas from escaping from the space between the bearing seat 3 and the shaft body 1.

[0029] Specifically, the rotary seal structure further includes: an intake switch, at least part of which is disposed in the third intake passage 30, and the position of the intake switch is movably arranged to block or avoid the airflow in the third intake passage 30. Preferably, the intake switch is a pneumatic valve or a pneumatic joint.

[0030] In the present application, as Figure 5As shown in the figure, there are multiple first intake channels 10, and the multiple first intake channels 10 are arranged at intervals along the radial or circumferential direction of the shaft body 1; and / or, there are multiple first exhaust channels 11, and the multiple first exhaust channels 11 are arranged at intervals along the radial or circumferential direction of the shaft body 1. Through the cooperation of the multiple first intake channels 10, air flow is provided to the cylinder body, and through the cooperation of the multiple first exhaust channels 11, the air flow in the cylinder body is discharged. By providing multiple first intake channels 10 and multiple first exhaust channels 11, the intake air volume in the cylinder can be ensured, and at the same time, the gas in the cylinder can be quickly discharged through the multiple first exhaust channels 11.

[0031] Further, there are multiple first intake channels 10 and multiple first exhaust channels 11; there are multiple second intake channels 20, and the multiple second intake channels 20 are arranged at intervals along the extension direction of the sealing member 2, and the multiple second intake channels 20 are arranged in one-to-one correspondence with the multiple first intake channels 10; and / or, there are multiple second exhaust channels 21, and the multiple second exhaust channels 21 are arranged at intervals along the extension direction of the sealing member 2, and the multiple second exhaust channels 21 are arranged in one-to-one correspondence with the multiple first exhaust channels 11. In order to ensure the consistency of the gas flow rate, on the basis of providing multiple first intake channels 10 and multiple first exhaust channels 11, multiple second intake channels 20, multiple second exhaust channels 21, multiple third intake channels 30 and multiple third exhaust channels 31 are respectively provided. Preferably, the multiple second intake channels 20 can be arranged adjacent to each other in sequence, and the multiple second exhaust channels 21 can be arranged adjacent to each other in sequence; or, the multiple second intake channels 20 and the multiple second exhaust channels 21 are arranged alternately in sequence.

[0032] During the specific implementation process, as Figure 4 shown, the first intake channel 10 includes: a first intake section 101, which is connected to the second intake channel 20, and the first intake section 101 extends along the radial direction of the shaft body 1; a second intake section 102, both ends of the second intake section 102 are respectively connected to the first intake section 101 and the cylinder block of the cylinder, and the second intake section 102 extends along the axial direction of the shaft body 1. In order to facilitate intake and ensure smooth air passage, the first intake channel 10 includes the first intake section 101 and the second intake section 102. After the gas flows into the first intake section 101 through the second intake channel 20, it is input into the cylinder body through the second intake section 102.

[0033] Furthermore, the first air outlet passage 11 includes: a first air outlet section 110, which communicates with the second air outlet passage 21, and the first air outlet section 110 extends along the radial direction of the shaft body 1; a second air outlet section 111, both ends of the second air outlet section 111 communicate with the first air outlet section 110 and the cylinder block of the cylinder respectively, and the second air outlet section 111 extends along the axial direction of the shaft body 1. In order to facilitate the discharge of the gas in the cylinder, the first air outlet passage 11 includes the first air outlet section 110 and the second air outlet section 111. After the gas in the cylinder flows into the second air outlet section 111, it is discharged through the first air outlet section 110.

[0034] In the specific implementation process, as Figure 1 and Figure 2 shown, the sealing member 2 includes: a spacer sleeve 22, sleeved on the shaft body 1, there are multiple spacer sleeves 22, and the multiple spacer sleeves 22 are arranged at intervals along the axial direction of the shaft body 1. The second air inlet passage 20 and the second air outlet passage 21 are respectively arranged on the spacer sleeve 22, and the second air inlet passage 20 and the second air outlet passage 21 respectively extend along the circumferential direction of the spacer sleeve 22; an intermediate sealing skeleton 23, sleeved on the shaft body 1, and two intermediate sealing skeletons 23 are arranged between every two adjacent spacer sleeves 22. A first groove 230 is arranged on the intermediate sealing skeleton 23, and the opening of the first groove 230 faces the spacer sleeve 22. In order to facilitate the intake of air into the first air inlet passage 10 and at the same time ensure the seal between the bearing seat 3 and the shaft body 1, the spacer sleeve 22 and the intermediate sealing skeleton 23 are sleeved on the shaft body 1. The second air inlet passage 20 and the second air outlet passage 21 are respectively arranged on the spacer sleeve 22, and the first groove 230 faces the spacer sleeve 22. In this way, when the gas exerts a force on the intermediate sealing skeleton 23, the two intermediate sealing skeletons 23 between the two spacer sleeves 22 deviate from each other and fit. Through the first groove 230, the two intermediate sealing skeletons 23 can fit more closely, can independently separate each intake / outlet area, ensure the sealing effect, and further ensure the smooth and accurate movement of the cylinder.

[0035] Furthermore, as Figures 1 to 3As shown in the figure, the rotary seal structure further includes: a bearing housing 3 sleeved on the shaft body 1. The bearing housing 3 is connected to the shaft body 1 through a bearing 4. The sealing member 2 is located between the bearing housing 3 and the shaft body 1. The bearing housing 3 is provided with a third air inlet channel 30 and a third air outlet channel 31. The third air inlet channel 30 is communicated with the second air inlet channel 20, and the third air outlet channel 31 is communicated with the second air outlet channel 21. The sealing member 2 includes: an end sealing skeleton 24 sleeved on the shaft body 1. The end sealing skeletons 24 are respectively arranged on both sides of the bearing 4. The end sealing skeleton 24 is provided with a second groove 240, and the opening of the second groove 240 faces away from the bearing 4. It should be noted here that the opening of the second groove 240 faces away from the bearing 4. In this way, when the second groove 240 is under pressure, it can fit more tightly with the bearing 4, thereby optimizing the sealing effect, protecting the bearing 4 and the internal working environment, and preventing corrosion and the entry of impurities. Preferably, the surfaces of the shaft body 1, the sealing member 2, the bearing housing 3, and the bearing 4 are respectively subjected to electroplating treatment or provided with an anti-corrosion coating. The anti-corrosion coating can be selected to brush rust-proof paint, so as to further improve the continuous working ability in a corrosive environment such as acid and alkali.

[0036] In this application, the bearing housing 3 is fixed on the machine body as a stator. The external air circuit interface is communicated with the third air inlet channel 30 on the bearing housing 3. The shaft body 1 is used as a rotor to realize rotary air supply. The end face opening is connected to the cylinder. The bearing 4 is preferably a deep groove ball bearing as a rotary mechanism support to directly provide the delivery of compressed air at the rotary support position.

[0037] The present utility model further provides a pneumatic system, including a rotary seal structure and a cylinder. The rotary seal structure is connected to the cylinder, and the rotary seal structure is the rotary seal structure of the above-mentioned embodiment.

[0038] From the above description, it can be seen that the above-mentioned embodiments of the present utility model achieve the following technical effects:

[0039] According to the rotary seal structure provided by the present application, including a shaft body 1 and a sealing member 2, the shaft body 1 is connected to the cylinder. A first air inlet channel 10 and a first air outlet channel 11 are arranged in the shaft body 1. The first air inlet channel 10 and the first air outlet channel 11 are respectively communicated with the cylinder block. The sealing member 2 is sleeved on the shaft body 1. The sealing member 2 is provided with a second air inlet channel 20 and a second air outlet channel 21. The second air inlet channel 20 is communicated with the first air inlet channel 10, and the second air outlet channel 21 is communicated with the first air outlet channel 11. Such a setting enables the rotary seal structure to achieve dynamic sealing of the cylinder. On this basis, by arranging the first air inlet channel 10 and the first air outlet channel 11 on the shaft body 1, a gas circulation loop is formed between the shaft body 1 and the cylinder block. The sealing member 2 is used to perform rotary sealing on the shaft body 1, so that there is no need to set a separate air circuit circulation component for the cylinder, simplifying the structure of the pneumatic system where the rotary seal structure is located and reducing the cost of the pneumatic system.

[0040] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A rotary seal structure, which is connected to a cylinder, is characterized in that The rotary seal structure includes: A shaft body (1) connected to the cylinder; A first intake passage (10) and a first exhaust passage (11) are provided inside the shaft body (1), and the first intake passage (10) and the first exhaust passage (11) are respectively communicated with the cylinder block of the cylinder; A sealing member (2) sleeved on the shaft body (1), a second intake passage (20) and a second exhaust passage (21) are provided on the sealing member (2), the second intake passage (20) is communicated with the first intake passage (10), and the second exhaust passage (21) is communicated with the first exhaust passage (11).

2. The rotary seal structure according to claim 1, wherein The rotary seal structure further includes: A bearing seat (3) sleeved on the shaft body (1), the bearing seat (3) is connected to the shaft body (1) through a bearing (4), and the sealing member (2) is located between the bearing seat (3) and the shaft body (1); A third intake passage (30) and a third exhaust passage (31) are provided on the bearing seat (3), the third intake passage (30) is communicated with the second intake passage (20), and the third exhaust passage (31) is communicated with the second exhaust passage (21).

3. The rotary seal structure according to claim 2, characterized in that, The rotary seal structure further includes: An intake switch, at least part of the intake switch is arranged in the third intake passage (30), and the position of the intake switch is movably arranged to block or avoid the air flow in the third intake passage (30).

4. The rotary seal structure according to claim 1, characterized in that There are multiple first intake passages (10), and the multiple first intake passages (10) are arranged at intervals in the radial or circumferential direction of the shaft body (1); and / or, There are multiple first exhaust passages (11), and the multiple first exhaust passages (11) are arranged at intervals in the radial or circumferential direction of the shaft body (1).

5. The rotary seal structure according to claim 4, characterized in that, There are multiple first intake passages (10) and multiple first exhaust passages (11); There are multiple second intake passages (20), and the multiple second intake passages (20) are arranged at intervals along the extending direction of the sealing member (2), and the multiple second intake passages (20) are arranged in one-to-one correspondence with the multiple first intake passages (10); and / or, There are multiple second exhaust passages (21), and the multiple second exhaust passages (21) are arranged at intervals along the extending direction of the sealing member (2), and the multiple second exhaust passages (21) are arranged in one-to-one correspondence with the multiple first exhaust passages (11).

6. The rotary seal structure according to claim 1, characterized in that The first intake passage (10) includes: A first intake section (101) communicated with the second intake passage (20), and the first intake section (101) extends along the radial direction of the shaft body (1); A second intake section (102), both ends of the second intake section (102) are respectively communicated with the first intake section (101) and the cylinder block of the cylinder, and the second intake section (102) extends along the axial direction of the shaft body (1).

7. The rotary seal structure according to claim 1, characterized in that, The first exhaust passage (11) includes: The first air outlet section (110) is communicated with the second air outlet channel (21), and the first air outlet section (110) extends along the radial direction of the shaft body (1); The second air outlet section (111), both ends of the second air outlet section (111) are respectively communicated with the first air outlet section (110) and the cylinder block of the cylinder, and the second air outlet section (111) extends along the axial direction of the shaft body (1).

8. The rotary seal structure according to claim 1, wherein The sealing member (2) includes: A spacer sleeve (22) sleeved on the shaft body (1), there are multiple spacer sleeves (22), and the multiple spacer sleeves (22) are arranged at intervals along the axial direction of the shaft body (1), the second air inlet channel (20) and the second air outlet channel (21) are respectively arranged on the spacer sleeve (22), and the second air inlet channel (20) and the second air outlet channel (21) respectively extend along the circumferential direction of the spacer sleeve (22); An intermediate sealing skeleton (23) sleeved on the shaft body (1), and two intermediate sealing skeletons (23) are arranged between every two adjacent spacer sleeves (22).

9. The rotating seal structure according to claim 8, wherein, A first groove (230) is arranged on the intermediate sealing skeleton (23), and the opening of the first groove (230) faces the spacer sleeve (22).

10. A pneumatic system, comprising a rotary sealing structure and a cylinder, the rotary sealing structure being connected to the cylinder, characterized in that, The rotary sealing structure is the rotary sealing structure according to any one of claims 1 to 9.

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