Roots blower with oil seal

Abstract

The utility model relates to the technical field of assembly tools, in particular to a Roots blower with an oil seal, which comprises an impeller box, a main oil tank and an auxiliary oil tank are respectively arranged at two ends of the impeller box, the impeller box and the auxiliary oil tank are separated by a wallboard, and a driving shaft is mounted in the impeller box. And one end of the driving shaft sequentially penetrates through the first mounting hole in the wall plate and the second mounting hole in the auxiliary oil tank so as to extend to the outside of the auxiliary oil tank. A bearing seat is mounted at the first mounting hole, a sealing seat is mounted at the second mounting hole, and the driving shaft penetrates through the bearing seat and the sealing seat. And two ends of the shaft sleeve are respectively inserted into the inner ring of the bearing seat and the inner ring of the sealing seat. Two TC type oil seals are installed between the bearing seat and the shaft sleeve, and two DC type oil seals are installed between the sealing seat and the shaft sleeve.

Description

Technical Field

[0001] The utility model relates to the technical field of blowers, in particular to a Roots blower with an oil seal. Background Art

[0002] A Roots blower generally includes an impeller box in the middle, a main oil tank and an auxiliary oil tank at both ends of the impeller box. The impeller box and the auxiliary oil tank are separated by a wall plate. An active shaft and a driven shaft are installed in the impeller box. Impellers that mesh with each other are arranged on the active shaft and the driven shaft. The pressurized transportation of gas can be realized by the opposite rotation of the impellers. Generally, one end of the driven shaft passes through the auxiliary oil tank and is suspended. One end of the active shaft passes through the wall plate and the side wall of the auxiliary oil tank in sequence and is connected to an external power source to receive external power.

[0003] In related technical solutions, in order to prevent the gas in the Roots blower from leaking from the gap between the active shaft and the auxiliary oil tank, generally at least four TC-type oil seals are installed between the mounting hole of the auxiliary oil tank and the active shaft. The TC oil seal is used to achieve dynamic sealing and prevent the gas in the Roots blower from flowing out of the auxiliary oil tank.

[0004] However, in the above technical solution, the axial width value of the four TC-type oil seals along the active shaft is relatively large, and the side wall of the auxiliary oil tank needs to have a relatively large thickness, which in turn requires an increase in the length and volume of the active shaft and is not conducive to realizing miniaturized design. In addition, it will also increase the bearing support distance of the active shaft at the wall plate, making the bearing more likely to be damaged. Summary of the Utility Model

[0005] The utility model provides a Roots blower with an oil seal, which can solve at least one of the above technical problems.

[0006] To solve the above technical problems, one or more embodiments of the utility model provide a Roots blower with an oil seal, including an impeller box. A main oil tank and an auxiliary oil tank are respectively arranged at both ends of the impeller box. The impeller box and the auxiliary oil tank are separated by a wall plate. An active shaft is installed in the impeller box. One end of the active shaft passes through the first mounting hole on the wall plate and the second mounting hole on the auxiliary oil tank in sequence to extend to the outside of the auxiliary oil tank. A bearing seat is installed at the first mounting hole, and a seal seat is installed at the second mounting hole. The active shaft passes through the bearing seat and the seal seat. A shaft sleeve is sleeved outside the active shaft, and both ends of the shaft sleeve are inserted into the inner rings of the bearing seat and the seal seat respectively. Two TC-type oil seals are installed between the bearing seat and the shaft sleeve, and two DC-type oil seals are installed between the seal seat and the shaft sleeve. The width of the TC-type oil seal along the axial direction of the active shaft is 12 mm to 14 mm, and the width of the DC-type oil seal along the axial direction of the active shaft is 18 mm to 22 mm.

[0007] The beneficial effects of the above one or more technical solutions are as follows:

[0008] In this solution, a bushing is sleeved outside the driving shaft. The two ends of the bushing are respectively inserted into the inner rings of the bearing and the seal seat; two TC-type oil seals are installed between the bearing seat and the bushing, and two DC-type oil seals are installed between the seal seat and the bushing. The width of the TC-type oil seal is 12 - 14 mm, and the width of the DC-type oil seal is 18 - 22 mm. In this setting method, two of the four oil seals, the TC-type oil seals, are installed in the bearing at the wall panel, and the other two DC-type oil seals are installed in the seal seat on the side wall of the auxiliary fuel tank. At the same time, with the width design of the oil seals, effective gas sealing can be achieved. That is, in this solution, by changing the four TC-type oil seals into two separated TC-type oil seals and two DC-type oil seals, while ensuring the sealing performance of the Roots blower to avoid gas leakage, the thinning design of the side wall of the auxiliary fuel tank can be realized. In addition, it is beneficial to reduce the length of the driving shaft, achieve the miniaturization design of the driving shaft, and facilitate reducing the support distance of the bearing and improving its service life. Brief Description of the Drawings

[0009] Figure 1 It is a partial structural schematic diagram of the Roots blower in the embodiment of the present utility model;

[0010] Figure 2 It is a cross-sectional view of the seal seat in the embodiment of the present utility model.

[0011] Reference Signs: 1, driving shaft; 2, first bolt; 3, end plate; 4, bearing seat; 5, TC-type oil seal; 6, bearing; 7, seal plate; 8, seal seat; 801, first mounting ring; 802, sleeve; 803, second mounting ring; 804, first hole; 805, second hole; 9, DC-type oil seal; 10, bushing; 11, wall panel; 12, side wall; 13, auxiliary fuel tank. Detailed Embodiment

[0012] To clearly illustrate the technical features of this solution, the present utility model will be elaborated in detail below through specific embodiments and in combination with its drawings.

[0013] The structural forms of the TC-type oil seal and the DC-type oil seal in this embodiment adopt the prior art and will not be elaborated here.

[0014] See Figure 1 - Figure 2, this embodiment provides a Roots blower with an oil seal, including an impeller box. A main oil tank and an auxiliary oil tank 13 are respectively arranged at both ends of the impeller box. The impeller box and the auxiliary oil tank 13 are separated by a wall plate 11. A driving shaft 1 is installed in the impeller box. One end of the driving shaft 1 sequentially passes through the first mounting hole on the wall plate 11 and the second mounting hole on the auxiliary oil tank 13 to extend to the outside of the auxiliary oil tank 13. A bearing seat 4 is installed at the first mounting hole, and a sealing seat 8 is installed at the second mounting hole. The driving shaft 1 passes through the bearing seat 4 and the sealing seat 8. A sleeve 10 is sleeved outside the driving shaft 1. Both ends of the sleeve 10 are respectively inserted into the inner ring of the bearing seat 4 and the inner ring of the sealing seat 8. Two TC-type oil seals 5 are installed between the bearing seat 4 and the sleeve 10, and two DC-type oil seals 9 are installed between the sealing seat 8 and the sleeve 10. The width of the TC-type oil seal 5 along the axial direction of the driving shaft 1 is 12 mm to 14 mm, and the width of the DC-type oil seal 9 along the axial direction of the driving shaft 1 is 18 mm to 22 mm.

[0015] Specifically, one end of the driving shaft 1 passes through the main oil tank, and the other end passes through the side wall 12 of the wall plate 11 and the auxiliary oil tank 13 and then extends to the outside of the blower. The part of the driving shaft 1 extending out of the blower is coaxially fixed with the driving motor to receive external rotational power.

[0016] Specifically, the side wall 12 of the impeller box here has an air inlet and an air outlet. An air inlet and an air outlet are respectively arranged on both sides of the plane where the driving shaft 1 and the driven shaft are located. A driving shaft 1 and a driven shaft are also arranged in the impeller box. Impellers are respectively arranged on the driving shaft 1 and the driven shaft. The parts of the driving shaft 1 and the driven shaft in the main oil tank are meshed through gears, so that the impellers on the driving shaft 1 and the driven shaft rotate towards each other, thereby facilitating the pressurized transportation of gas.

[0017] As a preferred width value, the width of the TC-type oil seal 5 along the axial direction of the driving shaft 1 is 13 mm, and the width of the DC-type oil seal 9 along the axial direction of the driving shaft 1 is 20 mm.

[0018] In some other structural settings, the width of the TC-type oil seal 5 can be 12 mm or 14 mm, and the width of the DC-type oil seal 9 can be 19 mm or 21 mm.

[0019] In this embodiment, the TC-type oil seal 5 is installed at one end of the bearing seat 4 close to the auxiliary oil tank 13, and the DC-type oil seal 9 is installed at one end of the sealing seat 8 close to the wall plate 11. One end of the bearing seat 4 facing away from the auxiliary oil tank 13 is open to form an installation cavity. An opposed roller bearing 6 is installed in the installation cavity, and the installation cavity of the bearing seat 4 is sealed by an end plate 3.

[0020] Specifically, one end of the bearing housing 4 close to the auxiliary fuel tank 13 (i.e., close to the side wall 12 of the auxiliary fuel tank 13) has a circular hole-shaped installation cavity, and one end of the sealing seat 8 close to the wall panel 11 (i.e., close to the bearing housing 4) also has a circular hole-shaped installation cavity. After the two ends of the bushing 10 are respectively inserted into the bearing housing 4 and the sealing seat 8, an annular gap is formed between the bearing housing 4 and the bushing 10 to facilitate the installation of the TC type oil seal 5, and an annular gap is also formed between the sealing seat 8 and the bushing 10 to facilitate the installation of the DC type oil seal 9.

[0021] In this embodiment, the sealing seat 8 includes a first mounting ring 801, a sleeve 802, and a second mounting ring 803 arranged in sequence along the axial direction of the driving shaft 1. The inner diameter of the sleeve 802 is larger than the outer diameter of the bushing 10, the outer diameter of the sleeve 802 is equal to the inner diameter of the mounting hole, the inner diameter of the second mounting ring 803 is equal to the outer diameter of the bushing 10, and the outer diameter of the first mounting ring 801 is larger than the diameter of the second mounting hole.

[0022] Specifically, the first mounting ring 801, the sleeve 802, and the second mounting ring 803 here are made by an integral molding method.

[0023] In this embodiment, one side of the sealing seat 8 close to the wall panel 11 is blocked by a sealing plate 7. Specifically, the sealing plate 7 is fixed to the body of the sealing seat 8 by a second bolt. The sealing plate 7 is an annular sealing plate 7 so that the sealing plate 7 can be sleeved outside the driving shaft 1. More specifically, a plurality of second bolts are provided on the sealing plate 7, and the plurality of second bolts are evenly distributed along the ring shape of the sealing plate 7.

[0024] Similarly, the end plate 3 is fixed to the body of the bearing housing 4 by a first bolt 2. The end plate 3 is an annular end plate 3 so that the end plate 3 can be sleeved outside the driving shaft 1. More specifically, a plurality of first bolts 2 are provided on the end plate 3, and the plurality of first bolts 2 are evenly distributed along the ring shape of the end plate 3.

[0025] In this embodiment, the end of the bushing 10 passing through the second mounting hole is flush with the outer side surface of the auxiliary fuel tank 13.

[0026] In this embodiment, the second mounting hole is a stepped hole. The second mounting hole includes a first hole 804 and a second hole 805. The diameter of the first hole 804 is larger than that of the second hole 805, and the inner diameter of the second hole 805 is equal to the outer diameter of the bushing 10.

[0027] In some structural settings, the DC type oil seal 9 is arranged in the first hole 804. The inner ring of the sealing ring has an annular protrusion. The outer diameter of the annular protrusion is equal to the inner diameter of the first hole 804, and the inner diameter of the annular protrusion is equal to the outer diameter of the bushing 10. During use, the annular protrusion is inserted into the first hole 804, and the annular protrusion abuts against the DC type oil seal 9.

[0028] Working principle: When using this device, first install bearings 6, bearing seats 4 and sealing seats 8 at the side wall 12 of the wall panel 11 and the auxiliary fuel tank 13, and then install a bushing 10 on the driving shaft 1. Install the TC type oil seal 5 on the bearing seat 4 and the DC type oil seal 9 on the sealing seat 8. Then block the bearing seat 4 with the end plate 3 and block the sealing seat 8 with the sealing plate 7.

[0029] When in use, the TC type oil seal 5 restricts the gas from entering the auxiliary fuel tank 13 from the impeller box, and the DC type oil seal 9 restricts the gas from leaking from the side wall 12 of the auxiliary fuel tank 13, thereby reducing the probability of gas leaking out of the Roots blower.

[0030] The above specific implementation manners shall not be used as a limitation to the protection scope of the present utility model. For those skilled in the art of this technology, any alternative improvement or transformation made to the implementation manners of the present utility model falls within the protection scope of the present utility model.

[0031] Those parts not detailed in the present utility model are all well-known technologies to those skilled in the art of this technology.

Claims

1. A Roots blower with an oil seal, comprising an impeller box, with a main oil tank and an auxiliary oil tank respectively arranged at both ends of the impeller box. The impeller box and the auxiliary oil tank are separated by a wall panel. An active shaft is installed in the impeller box. One end of the active shaft sequentially passes through the first mounting hole on the wall panel and the second mounting hole on the auxiliary oil tank to extend outside the auxiliary oil tank. It is characterized in that: A bearing seat is installed at the first mounting hole, and a seal seat is installed at the second mounting hole. The active shaft passes through the bearing seat and the seal seat. A shaft sleeve is sleeved outside the active shaft, and both ends of the shaft sleeve are respectively inserted into the inner ring of the bearing seat and the inner ring of the seal seat; Two TC type oil seals are installed between the bearing seat and the shaft sleeve, and two DC type oil seals are installed between the seal seat and the shaft sleeve; the width of the TC type oil seal along the axial direction of the active shaft is 12 mm to 14 mm, and the width of the DC type oil seal along the axial direction of the active shaft is 18 mm to 22 mm.

2. The Roots blower with an oil seal according to claim 1, characterized in that, The width of the TC type oil seal along the axial direction of the active shaft is 13 mm, and the width of the DC type oil seal along the axial direction of the active shaft is 20 mm.

3. The Roots blower with an oil seal according to claim 1, characterized in that, The TC type oil seal is installed at one end of the bearing seat close to the auxiliary oil tank, and the DC type oil seal is installed at one end of the seal seat close to the wall panel.

4. The Roots blower with an oil seal according to claim 1, characterized in that, One end of the bearing seat facing away from the auxiliary oil tank is open to form an installation cavity, and an aligned roller bearing is installed in the installation cavity. The installation cavity of the bearing seat is sealed by an end plate.

5. The Roots blower with an oil seal according to claim 1, characterized in that, The seal seat includes a first mounting ring, a sleeve and a second mounting ring arranged in sequence along the axial direction of the active shaft. The inner diameter of the sleeve is larger than the outer diameter of the shaft sleeve, the outer diameter of the sleeve is equal to the inner diameter of the mounting hole, the inner diameter of the second mounting ring is equal to the outer diameter of the shaft sleeve, and the outer diameter of the first mounting ring is larger than the diameter of the second mounting hole.

6. The Roots blower with an oil seal according to claim 1, wherein One side of the seal seat close to the wall panel is sealed by a sealing plate.

7. The Roots blower with an oil seal according to claim 1, characterized in that, The end of the shaft sleeve passing through the second mounting hole is flush with the outer side surface of the auxiliary oil tank.

8. The Roots blower with an oil seal according to claim 1, characterized in that, The second mounting hole is a stepped hole, and the second mounting hole includes a first hole and a second hole. The diameter of the first hole is larger than that of the second hole, and the inner diameter of the second hole is equal to the outer diameter of the shaft sleeve.

Images