阅读说明：本技术 一种不喘振的多级离心鼓风机 (Surging-free multistage centrifugal blower ) 是由 盖京方 王洪强 孔祥飞 魏如彬 马德明 盖克洲 于 2019-11-13 设计创作，主要内容包括：本发明公开一种不喘振的多级离心鼓风机,它包括进气机壳、出气机壳、中间机壳、主轴和叶轮；出气机壳的出口端处设有风量感应器；出气机壳上设有排气管；主轴的两端分别设有进气、出气轴承座；出气轴承座上设有振动传感器；叶轮与主轴传动连接；出气机壳与主轴的连接处设有平衡盘；平衡盘的外侧设有密封罩,且密封罩的一端与出气机壳连接,另一端与主轴连接；密封罩与主轴的连接处设有位移感应器；密封罩与平衡盘之间形成一密封腔室；密封腔室通过回气管与进气机壳连通。本发明优化了气体回流及密封结构,不仅能够克服因轴承损坏引起的间隙变化损坏设备,更能避免因系统阻力变化与风机压力不适应造成的设备损坏,确保鼓风机能可靠运行。(The invention discloses a surge-free multistage centrifugal blower, which comprises an air inlet casing, an air outlet casing, an intermediate casing, a main shaft and an impeller, wherein the air inlet casing is connected with the air outlet casing; an air quantity sensor is arranged at the outlet end of the air outlet casing; an exhaust pipe is arranged on the air outlet casing; the two ends of the main shaft are respectively provided with an air inlet bearing seat and an air outlet bearing seat; a vibration sensor is arranged on the air outlet bearing seat; the impeller is in transmission connection with the main shaft; a balance disc is arranged at the joint of the air outlet casing and the main shaft; a sealing cover is arranged on the outer side of the balance disc, one end of the sealing cover is connected with the air outlet machine shell, and the other end of the sealing cover is connected with the main shaft; a displacement sensor is arranged at the joint of the sealing cover and the main shaft; a sealing chamber is formed between the sealing cover and the balance disc; the sealed chamber is communicated with the air inlet machine shell through an air return pipe. The invention optimizes the gas backflow and sealing structure, can overcome the defect that equipment is damaged due to the change of the clearance caused by the damage of the bearing, can also avoid the damage of the equipment caused by the inadaptation of the change of the system resistance and the pressure of the blower, and ensures the reliable operation of the blower.)

1. A surge-free multistage centrifugal blower comprising a housing assembly, a main shaft (10) and an impeller (9);

the shell assembly comprises an air inlet shell (13), an air outlet shell (8) and a plurality of intermediate shells (12) arranged between the air inlet shell (13) and the air outlet shell (8), wherein the air inlet shell (13) and the air outlet shell (8) are communicated with each other; a cavity is arranged in the middle shell (12); the method is characterized in that:

an air quantity sensor (18) is arranged at the outlet end of the air outlet casing (8); an exhaust pipe (20) with a pressure sensor (22) and an automatic valve (21) is arranged at the outlet end of the air outlet casing (8);

the main shaft (10) is arranged in the middle of the shell assembly, and two ends of the main shaft (10) are connected with the air inlet machine shell (13) and the air outlet machine shell (8) through an air inlet bearing seat (14) and an air outlet bearing seat (2) respectively; a vibration sensor (17) is arranged on the air outlet bearing seat (2);

the impeller (9) is correspondingly arranged in a cavity in the middle shell (12) and is in transmission connection with the main shaft (10); a first gap (11) is reserved between the impeller (9) and the middle chamber;

a balance disc (7) with a sealing ring is arranged at the joint of the air outlet casing (8) and the main shaft (10); a sealing cover (6) is arranged on the outer side of the balance disc (7), one end of the sealing cover (6) is connected with the air outlet machine shell (8), and the other end of the sealing cover is connected with the main shaft (10); a second gap (25) and a displacement inductor (5) are reserved at the joint of the sealing cover (6) and the main shaft (10); a sealing chamber (26) is formed between the sealing cover (6) and the balance disc (7); the sealed chamber (26) is communicated with the air inlet casing (13) through an air return pipe (1);

the air volume sensor (18), the pressure sensor (22), the vibration sensor (17), the displacement sensor (5) and the automatic valve (21) are electrically connected with an electric controller respectively.

2. A surge-free multistage centrifugal blower as claimed in claim 1, wherein the outlet end of the outlet housing (8) is provided with a diffuser pipe (19).

3. The surge-free multistage centrifugal blower according to claim 1, wherein a heavy support bearing (3) is arranged in the outlet bearing seat (2), and a third gap (24) is reserved between the heavy support bearing (3) and a bearing side cover (23) arranged on one side of the outlet bearing seat (2); the heavy support bearing (3) slides within the third gap (24).

4. A surge-free multistage centrifugal blower as claimed in claim 1, wherein the outer peripheral wall and the outer side wall of said balance disk (7) are labyrinth seals (16), respectively.

5. A surge-free multistage centrifugal blower as claimed in claim 1, characterized in that the inlet bearing block (14) is formed by two radial ball bearings (15), and a spacer (4) is provided between the two radial ball bearings (15).

6. The surge-free multistage centrifugal blower as claimed in claim 1, wherein the impeller (9) is provided on its surface with a coating, the coating thickness being 500-.

7. The surge-free multi-stage centrifugal blower of claim 6 wherein said coating is made by the steps of:

step 1) taking the following raw materials in parts by weight: 100 parts of pure acrylic emulsion, 60 parts of deionized water, 8 parts of nano silicon dioxide, 5 parts of nylon fiber, 3 parts of propylene glycol ether, 2 parts of expanded graphite, 1 part of carbon fiber, 1 part of silane coupling agent, 0.8 part of talcum powder, 0.5 part of dimethyl silicone oil and 0.1 part of 2-aminoisobutanol;

step 2) adding nano silicon dioxide and expanded graphite into deionized water which accounts for twice of the weight of the silicon dioxide in sequence, stirring at 500rpm for 5min, then adding talcum powder, continuing to stir at 500rpm for 3min, and then performing ultrasonic dispersion treatment for 10min to prepare filler slurry;

step 3) adding the pure acrylic emulsion into a high-speed dispersion machine, performing dispersion treatment for 2min at 3000rpm, then adding filler slurry, nylon fibers and carbon fibers, and performing dispersion treatment for 10min at 3000rpm to obtain feed liquid A;

step 4) adding propylene glycol ether, a silane coupling agent, simethicone and 2-aminoisobutanol into the rest deionized water in sequence, and stirring at 1000rpm for 5min to obtain a feed liquid B;

step 5) adding the material liquid B into the material liquid A, and stirring at 500rpm for 10min to prepare the coating;

and 6) coating the paint on the surface of the impeller, drying for 15min at 80 ℃, and naturally cooling to room temperature.

8. The surge-free multistage centrifugal blower of claim 6 wherein said silane coupling agent is KH 550.

9. The surge-free multi-stage centrifugal blower of claim 6 wherein said ultrasonic power is 500W.

Technical Field

The invention belongs to the technical field of blowers, and particularly relates to a surge-free multistage centrifugal blower.

Background

Disclosure of Invention

The invention aims to solve the technical problem that the sealing part between an impeller and a casing is scratched and damaged due to the change of system resistance or the change of a gap caused by the damage of a bearing of an air blower in the prior art, and provides a surge-free multistage centrifugal air blower to overcome the defects in the prior art.

The invention is realized by the following technical scheme:

the invention relates to a surge-free multistage centrifugal blower, which comprises a shell assembly, a main shaft and an impeller;

the shell assembly comprises an air inlet shell, an air outlet shell and a plurality of intermediate shells, wherein the air inlet shell and the air outlet shell are communicated with each other; a cavity is arranged in the middle machine shell; an air quantity sensor is arranged at the outlet end of the air outlet casing; an exhaust pipe with a pressure sensor and an automatic valve is arranged at the outlet end of the air outlet casing;

the main shaft is arranged in the middle of the shell assembly, and two ends of the main shaft are respectively connected with the air inlet machine shell and the air outlet machine shell through an air inlet bearing seat and an air outlet bearing seat; a vibration sensor is arranged on the air outlet bearing seat;

the impeller is correspondingly arranged in a cavity in the middle shell and is in transmission connection with the main shaft; a first gap is reserved between the impeller and the middle chamber;

a balance disc with a sealing ring is arranged at the joint of the air outlet casing and the main shaft; a sealing cover is arranged on the outer side of the balance disc, one end of the sealing cover is connected with the air outlet casing, and the other end of the sealing cover is connected with the main shaft; a second gap and a displacement inductor are reserved at the joint of the sealing cover and the main shaft; a sealing chamber is formed between the sealing cover and the balance disc; the sealed chamber is communicated with the air inlet shell through an air return pipe;

the air quantity sensor, the pressure sensor, the vibration sensor, the displacement sensor and the automatic valve are respectively and electrically connected with the electric controller.

Furthermore, a diffusion pipe is arranged at the outlet end of the air outlet casing.

Furthermore, a heavy support bearing is arranged in the air outlet bearing seat, and a third gap is reserved between the heavy support bearing and a bearing side cover arranged on one side of the air outlet bearing seat; the heavy support bearing slides within the third gap.

Further, the outer peripheral wall and the outer side wall of the balance disc are respectively labyrinth seals.

Furthermore, the air inlet bearing seat is composed of two radial ball bearings, and a spacer bush is arranged between the two radial ball bearings.

The invention has reasonable structure and reliable operation, optimizes gas reflux and sealing structure, can overcome the defect that equipment is damaged due to the change of clearance caused by the damage of a bearing, can also avoid the damage of the equipment caused by the change of system resistance and the inadaptation of fan pressure, and ensures the reliable operation of the blower.

In order to reduce wind noise generated by rotation of the impeller and reduce noise, the surface of the impeller is provided with the coating, and the coating has excellent noise reduction and vibration reduction performance.

The coating is prepared according to the following steps:

step 1) taking the following raw materials in parts by weight: 100 parts of pure acrylic emulsion, 60 parts of deionized water, 8 parts of nano silicon dioxide, 5 parts of nylon fiber, 3 parts of propylene glycol ether, 2 parts of expanded graphite, 1 part of carbon fiber, 1 part of silane coupling agent, 0.8 part of talcum powder, 0.5 part of dimethyl silicone oil and 0.1 part of 2-aminoisobutanol;

step 2) adding nano silicon dioxide and expanded graphite into deionized water which accounts for twice of the weight of the silicon dioxide in sequence, stirring at 500rpm for 5min, then adding talcum powder, continuing to stir at 500rpm for 3min, and then performing ultrasonic dispersion treatment for 10min to prepare filler slurry;

step 3) adding the pure acrylic emulsion into a high-speed dispersion machine, performing dispersion treatment for 2min at 3000rpm, then adding filler slurry, nylon fibers and carbon fibers, and performing dispersion treatment for 10min at 3000rpm to obtain feed liquid A;

step 4) adding propylene glycol ether, a silane coupling agent, simethicone and 2-aminoisobutanol into the rest deionized water in sequence, and stirring at 1000rpm for 5min to obtain a feed liquid B;

step 5) adding the material liquid B into the material liquid A, and stirring at 500rpm for 10min to prepare the coating;

and 6) coating the paint on the surface of the impeller, drying for 15min at 80 ℃, and naturally cooling to room temperature.

Preferably, the silane coupling agent is KH 550.

Preferably, the ultrasonic power is 500W.

Compared with the prior art, the effects of the invention mainly include, but are not limited to, the following aspects:

the blower can carry out double protection on the clearance change of the blower through the pressure displacement control system, and the blower is protected from being continuously damaged due to the damage of parts such as bearings and the like;

the blower can give an alarm and perform pressure relief protection on equipment through vibration and an air flow control system;

labor and time are saved, and the operation is convenient and quick, so that the fault-free operation time of the air blower is greatly prolonged, the reliability of the air blower is enhanced, and the operation efficiency of the air blower is improved.

The actuating mechanism and the control device of the monitoring device are both arranged at the external obvious and convenient positions of the blower casing, so that the running state of the blower can be observed and adjusted in time, and the use by a user is facilitated.

The impeller is coated by the coating, so that the impeller has good noise reduction and vibration reduction performance and strong adhesive force; the coating has a pore structure, and in the transmission process of sound, air in pores moves to rub with the pore wall, and sound energy is converted into heat energy to be dissipated due to viscosity and heat conduction effect, so that the performance of noise reduction and shock absorption is achieved; the nano silicon dioxide can form a stable structure in the coating, and can fill up graphite pores to form a coating structure with higher strength; the nylon fiber and the carbon fiber have good flame retardant and water absorption performance, can be dispersed in resin to form a mesh pore structure, and convert sound energy into heat energy in the sound wave conduction process, thereby playing a role in noise reduction.

Drawings

FIG. 1 is a schematic front sectional view of the structure of the present invention.

Fig. 2 is a schematic left side view of the structure of the present invention.

Fig. 3 is an enlarged view of the structure at a in fig. 1.

Fig. 4 is a schematic enlarged view of the structure at B in fig. 1.

Fig. 5 is an enlarged view of the structure at C in fig. 1.

Fig. 6 is an enlarged view of the structure shown at D in fig. 1.

In the figure, the air return pipe 1, the air outlet bearing seat 3, the support bearing 4, the spacer 5, the displacement sensor 6, the sealing cover 7, the balance disk 8, the air outlet casing 9, the impeller 10, the main shaft 11, the first gap 12, the middle casing 13, the air inlet casing 14, the air inlet bearing seat 15, the radial ball bearing 16, the labyrinth seal 17, the vibration sensor 18, the air volume sensor 19, the diffuser pipe 20, the exhaust pipe 21, the automatic valve 22, the pressure sensor 23, the bearing side cover 24, the third gap 25, the second gap 26 and the sealing chamber are arranged.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.