Screw blower with flexible seal

Abstract

The utility model provides a screw blower with flexible sealing device, it includes casing assembly and transmission assembly, casing assembly includes shell body, wallboard and oil tank, transmission assembly includes male rotor and female rotor, the outer circumference of rotor shaft that male rotor and female rotor are located gear end wallboard and non drive end wallboard position is equipped with the bushing respectively, a plurality of bushings are equipped with flexible sealing assembly between the inner circumference of corresponding wallboard respectively, the inboard side of flexible sealing assembly is flexible material. Under the effect of flexible material, realize flexible contact between its and the outboard side of bushing, when the rotor or bushing appears small amplitude deformation, the inboard side of flexible sealing device also will follow suit and conform to deformation, after conforming to deformation, will not destroy the sealing effect between bushing and wallboard, can avoid appearing lubricating oil and transmission gas leak problem, prolongs the service life of blower. The utility model can be widely applied to screw blower.

Description

Technical Field

[0001] This utility model relates to a screw blower, and more particularly to a screw blower with a flexible sealing device. Background Technology

[0002] A screw blower is a gas conveying device that uses screw compression technology. It features high efficiency, low energy consumption, and low noise, and is widely used in low-pressure gas compression scenarios.

[0003] When a blower is running, there are strict standards for its internal sealing performance, especially the sealing performance between the bushing and the wall plate on the outside of the rotor shaft. Currently, most screw blowers use mechanical seals between the bushing and the wall plate. The mechanical seal is made of rigid material and has a rigid rotary seal connection with the bushing.

[0004] However, during long-term operation of the blower, under the continuous high temperature, the rotor will inevitably undergo slight deformation. After deformation, the relative position between the bushing and the mechanical seal will also change. At this time, since the mechanical seal and the bushing are rigidly connected, the bushing and the mechanical seal will rub against each other during the high-speed rotation of the rotor, reducing the sealing effect between the bushing and the mechanical seal, resulting in leakage of lubricating oil and transmitted gas. At the same time, it also causes the mechanical seal and the bushing to suffer varying degrees of wear, reducing their service life. Utility Model Content

[0005] This utility model addresses the above-mentioned technical problems by providing a screw blower with a flexible sealing device. The rigid mechanical seal between the rotor and bushing is replaced with a flexible sealing device. Because the inner side of the flexible sealing device is made of flexible material, it achieves flexible contact with the outer side of the bushing. When the rotor or bushing undergoes slight deformation, the inner side of the flexible sealing device will also deform accordingly. This deformation does not damage the sealing effect between the bushing and the wall panel, thus preventing leakage of lubricating oil and transmitted gas, and extending the blower's service life.

[0006] Therefore, the technical solution of this utility model is a screw blower with a flexible sealing device, including a housing assembly and a transmission assembly. The housing assembly includes an outer shell, wall plates, and an oil tank. The wall plates are composed of gear end wall plates and non-drive end wall plates, which are fixedly connected to both ends of the outer shell. The oil tank is fixedly connected to the outer side of the gear end wall plates. The transmission assembly includes a male rotor and a female rotor, both of which are located inside the housing assembly and can mesh and rotate inside the housing assembly.

[0007] The rotor shafts at both ends of the male rotor and the female rotor are located inside the gear end wall plate and the non-drive end wall plate, respectively. Bushings are provided on the outer circumference of the rotor shafts on the male rotor and the female rotor at the positions of the gear end wall plate and the non-drive end wall plate, respectively. The inner circumference of the multiple bushings is fixedly connected to the outer circumference of the corresponding rotor shaft.

[0008] Multiple bushings are provided with flexible sealing components between their inner circumference and the inner circumference of their respective wall panels. The inner side of the flexible sealing components is made of flexible material. The outer circumference of the multiple flexible sealing components is fixedly connected to the inner circumference of their respective wall panels. The inner circumference of the multiple flexible sealing components is rotatably sealed to the outer circumference of their respective bushings.

[0009] Preferably, the flexible sealing assembly consists of a metal retaining ring, a sealing adhesive, and a flexible sealing ring. The metal retaining ring is located on the outer side of the flexible sealing assembly, the sealing adhesive is located in the middle of the flexible sealing assembly, and the flexible sealing ring is located on the inner side of the flexible sealing assembly. The metal retaining ring and the flexible sealing ring are fixedly connected by the sealing adhesive.

[0010] The metal retaining ring is made of rigid material, while the flexible sealing ring is made of flexible material.

[0011] Preferably, the inner circumferential surface of the metal retaining ring is provided with a spiral groove.

[0012] Preferably, the bushing is a comb-tooth sealing bushing, which consists of an inner section and an outer section. The inner section is located on the inner side of the axial direction, and the outer section is located on the outer side of the axial direction. Sealing comb teeth are provided on the outer circumference of the inner section.

[0013] The flexible sealing ring is located on the outer circumference of the inner section of the comb-tooth sealing bushing. The flexible sealing ring and the sealing comb are rotated and sealed together, forming a labyrinth sealing structure.

[0014] An oil seal is provided between the outer circumference of the outer section of the comb-tooth sealing bushing and the inner circumference of the corresponding wall plate. The outer section of the comb-tooth sealing bushing and the corresponding wall plate are connected by a rotary seal through the oil seal.

[0015] The beneficial effects of this utility model are that by setting a flexible sealing component between multiple comb-tooth sealing bushings and the corresponding wall panels, and with the inner side of the flexible sealing component being made of flexible material, the inner side of the component is in flexible contact with the outer side of the bushing. When the rotor or bushing undergoes slight deformation due to factors such as high temperature and high pressure, the inner side of the flexible sealing component will also deform accordingly. Even after deformation, the inner side of the flexible sealing component and the outer side of the bushing remain in a sealed state, without damaging the sealing effect between the bushing and the wall panel. This can prevent the problem of lubricating oil and transmitted gas leakage during blower operation and extend the service life of the blower. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a utility model Figure 1 Enlarged view of point A in the middle.

[0018] Explanation of symbols in the diagram:

[0019] 1. Outer shell; 2. Gear end wall plate; 3. Non-drive end wall plate; 4. Oil tank; 5. Male rotor; 6. Female rotor; 7. Flexible sealing assembly; 701. Metal retaining ring; 702. Sealing adhesive; 703. Flexible sealing ring; 8. Oil seal; 9. Comb tooth sealing bushing; 901. Inner section of comb tooth sealing bushing; 90101. Sealing comb tooth; 902. Outer section of comb tooth sealing bushing. Detailed Implementation

[0020] The present invention will be further described below with reference to the embodiments.

[0021] pass Figures 1-2 As can be seen, the screw blower with flexible sealing device includes a housing assembly and a transmission assembly. The housing assembly includes an outer shell 1, wall plates, and an oil tank 4. The wall plates are composed of a gear end wall plate 2 and a non-drive end wall plate 3. The gear end wall plate 2 and the non-drive end wall plate 3 are fixedly connected to both ends of the outer shell 1, respectively. The oil tank 4 is fixedly connected to the outer side of the gear end wall plate 2. The transmission assembly includes a male rotor 5 and a female rotor 6. Both the male rotor 5 and the female rotor 6 are located inside the housing assembly and can mesh and rotate inside the housing assembly.

[0022] The rotor shafts at both ends of the male rotor 5 and the female rotor 6 are located inside the gear end wall plate 2 and the non-drive end wall plate 3, respectively. Bushings are provided on the outer circumference of the rotor shafts of the male rotor 5 and the female rotor 6 located at the gear end wall plate 2 and the non-drive end wall plate 3, respectively. The inner circumference of the multiple bushings is fixedly connected to the outer circumference of the corresponding rotor shaft.

[0023] Multiple bushings are provided with flexible sealing components 7 between their inner circumference and the inner circumference of their respective wall panels. The inner side of the flexible sealing components 7 is made of flexible material. The outer circumference of the multiple flexible sealing components 7 is fixedly connected to the inner circumference of their respective wall panels. The inner circumference of the multiple flexible sealing components 7 is rotatably sealed to the outer circumference of their respective bushings.

[0024] Because the inner side of the flexible sealing component 7 is made of flexible material, it is in flexible contact with the outer side of the bushing. When the rotor or bushing is deformed slightly due to factors such as high temperature and high pressure, the inner side of the flexible sealing device will also deform accordingly. After deformation, the inner side of the flexible sealing component 7 and the outer side of the bushing are still in a sealed state, which will not damage the sealing effect between the bushing and the wall panel. This can prevent the problem of lubricating oil and transmission gas leakage during blower operation and extend the service life of the blower.

[0025] In one specific embodiment, the flexible sealing assembly 7 is composed of a metal retaining ring 701, a sealing adhesive 702, and a flexible sealing ring 703. The metal retaining ring 701 is located on the outer side of the flexible sealing assembly 7, the sealing adhesive 702 is located in the middle of the flexible sealing assembly 7, and the flexible sealing ring 703 is located on the inner side of the flexible sealing assembly 7. The metal retaining ring 701 and the flexible sealing ring 703 are fixedly connected by the sealing adhesive 702.

[0026] The metal retaining ring 701 is made of rigid material and is rigidly fixed to the wall panel, thereby ensuring the firmness of the flexible sealing component 7 and the stability of its application. The flexible sealing ring 703 is made of flexible material, which forms a flexible seal with the bushing, i.e., an elastic sealing structure. When the rotor or bushing undergoes a small deformation, the inner side of the flexible sealing device will also deform accordingly. After deformation, the sealing effect between the bushing and the wall panel will not be damaged, which can avoid the problem of leakage of lubricating oil and transmitted gas, and extend the service life of the blower. The material of the flexible sealing ring 703 is preferably PTFE Teflon rubber, which has a self-lubricating effect, eliminating the need for additional medium lubrication and reducing costs.

[0027] In one specific embodiment, the inner circumferential surface of the metal retaining ring 701 is provided with a spiral groove. The metal retaining ring 701 and the sealing adhesive 702 are fixed by the tooth shape of the spiral structure. Compared with planar fixing, the fixation is more reliable and the structural stability is better, which can avoid the problem of structural separation during long-term stress.

[0028] In one specific embodiment, the bushing is a comb-tooth sealing bushing 9, which consists of an inner section 901 and an outer section 902. The inner section 901 is located on the inner side of the axial direction, and the outer section 902 is located on the outer side of the axial direction. The outer circumference of the inner section 901 is provided with sealing comb teeth 90101. A flexible sealing ring 703 is located on the outer circumference of the inner section 901 and flexibly contacts and seals with the sealing comb teeth 90101, thus forming a complete labyrinth seal structure and further enhancing the sealing capability.

[0029] In one specific embodiment, the inner circumference of the flexible sealing ring 703 and the outer diameter of the comb teeth of the rotor shaft are sealed by interference fit, making the sealing gap zero, which greatly reduces the amount of fluid leakage. In addition, the interference fit between the two is precisely calculated, which ensures the sealing effect while minimizing the contact friction force, thereby ensuring that the frictional heat generated when the rotor is running at high speed is low. At the same time, since the flexible sealing ring 703 is thin, the heat generated during rotation is quickly dissipated to the outside through the metal fixing ring 701, resulting in a significant heat dissipation and cooling effect, improving the sealing effect and reducing the overall energy consumption of the blower.

[0030] An oil seal 8 is provided between the outer circumference of the outer section 902 of the comb-tooth sealing bushing and the inner circumference of the corresponding wall plate. The outer section 902 of the comb-tooth sealing bushing and the corresponding wall plate are connected by a rotary seal through the oil seal 8, which can further prevent the leakage of lubricating oil or transmitted gas during the operation of the blower.

[0031] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A screw blower with a flexible seal, characterized by: The device includes a housing assembly and a transmission assembly. The housing assembly includes an outer shell, wall panels, and an oil tank. The wall panels are composed of gear end wall panels and non-drive end wall panels, which are fixedly connected to both ends of the outer shell. The oil tank is fixedly connected to the outer side of the gear end wall panels. The transmission assembly includes a male rotor and a female rotor, both of which are located inside the housing assembly and can mesh and rotate inside the housing assembly. The rotor shafts at both ends of the male rotor and the female rotor are located inside the gear end wall plate and the non-drive end wall plate, respectively. The outer circumference of the rotor shafts on the male rotor and the female rotor located at the gear end wall plate and the non-drive end wall plate is provided with bushings, and the inner circumference of the multiple bushings is fixedly connected to the outer circumference of the corresponding rotor shaft. Each of the bushings is provided with a flexible sealing component between its inner circumference and the inner circumference of the corresponding wall panel. The inner side of the flexible sealing component is made of flexible material. The outer circumference of each of the flexible sealing components is fixedly connected to the inner circumference of the corresponding wall panel. The inner circumference of each of the flexible sealing components is rotatably sealed to the outer circumference of the corresponding bushing.

2. Screw blower with flexible sealing according to claim 1, characterized in that The flexible sealing assembly consists of a metal retaining ring, a sealing adhesive, and a flexible sealing ring. The metal retaining ring is located on the outer side of the flexible sealing assembly, the sealing adhesive is located in the middle of the flexible sealing assembly, and the flexible sealing ring is located on the inner side of the flexible sealing assembly. The metal retaining ring and the flexible sealing ring are fixedly connected by the sealing adhesive. The metal retaining ring is made of a rigid material, and the flexible sealing ring is made of a flexible material.

3. Screw blower with flexible sealing according to claim 2, characterized in that The inner circumferential surface of the metal retaining ring is provided with a spiral groove.

4. Screw blower with flexible sealing according to claim 3, characterized in that The bushing is a comb-tooth sealing bushing, which is composed of an inner section and an outer section. The inner section is located on the inner side of the axial direction, and the outer section is located on the outer side of the axial direction. The outer circumference of the inner section is provided with sealing comb teeth. The flexible sealing ring is located on the outer circumference of the inner section of the comb-tooth sealing bushing. The flexible sealing ring and the sealing comb are rotatably sealed together, forming a labyrinth sealing structure. An oil seal is provided between the outer circumference of the outer section of the comb-tooth sealing bushing and the inner circumference of the corresponding wall plate, and the outer section of the comb-tooth sealing bushing and the corresponding wall plate are connected by a rotary seal through the oil seal.

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