Anti-explosion air suspension blower based on positive pressure sealing

Abstract

The invention is suitable for the technical field of air suspension blowers, and provides an anti-explosion air suspension blower based on positive pressure sealing, the anti-explosion air suspension blower comprises an impeller, a volute, a motor and a carbon ring seal, the impeller is installed in the center of the volute and installed on a rotor, and an air inlet channel and an exhaust channel which are communicated with a motor cavity are arranged on a motor shell; pure air or inert gas enters the motor cavity through the air inlet channel and then is exhausted out of the motor shell through the exhaust channel, and meanwhile it is guaranteed that the pressure in the motor cavity is always higher than the external pressure. The carbon ring seal is arranged between the impeller and the motor, pure air or inert gas is input into the carbon ring seal, and meanwhile it is guaranteed that the pressure in the carbon ring seal is always higher than the pressure of the joint of the impeller and the motor, so that hazardous gas can be prevented from entering the air suspension motor through the cooling gas inlet in the air suspension air blower, and the service life of the air suspension motor is prolonged. Meanwhile, dangerous gas can be prevented from entering the air suspension motor through the joint of the impeller and the motor, the air suspension blower is further prevented from exploding, and the safety is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air suspension blowers, and in particular to an explosion-proof air suspension blower based on positive pressure sealing. Background Art

[0002] With the rapid popularization of air suspension technology, the application field of air suspension blowers continues to expand. However, if air suspension blowers are to be used in dangerous places such as petroleum, chemical, oil and gas, and medicine, they must meet explosion-proof requirements. Due to the complex structure of the air suspension motor in the air suspension blower, it is difficult to meet the explosion-proof requirements using the traditional flameproof structure. Therefore, traditional air suspension blowers cannot be used in dangerous places such as petroleum, chemical, oil and gas, and medicine.

[0003] However, the inventors have discovered that the reason why traditional air suspension blowers are difficult to meet explosion-proof requirements is that when the air suspension blower is running, dangerous gases from the outside can easily enter the air suspension motor. When the air suspension blower is running, there are two situations in which dangerous gases can enter the air suspension motor: the first situation is that the dangerous gases directly enter the air suspension motor through the cooling gas inlet on the air suspension motor; the second situation is that when the dangerous gases enter the volute chamber through the process gas inlet on the volute, some of the dangerous gases will enter the air suspension motor through the connection between the impeller and the air suspension motor. Both of the above situations may cause the air suspension blower to explode.

[0004] Therefore, how to prevent dangerous gases from entering the air suspension motor and thus prevent the air suspension blower from exploding and improve safety is an issue that needs to be solved urgently. Summary of the invention

[0005] In response to the technical problems raised above, an explosion-proof air suspension blower based on positive pressure sealing is provided.

[0006] The technical means adopted by the present invention are as follows:

[0007] A positive pressure seal-based explosion-proof air suspension blower comprises an impeller, a volute, a motor filled with pure air or inert gas, and a carbon ring seal with isolation gas, wherein the impeller is rotatably mounted in the volute, and the impeller is connected to the motor; the motor comprises a rotor, a stator, and a motor casing, a motor cavity is arranged in the motor casing, the rotor and the stator are both arranged in the motor cavity, and the impeller and the carbon ring seal with isolation gas are arranged on the rotor; an air inlet channel and an exhaust channel connected to the motor cavity are arranged on the motor casing, the pure air or inert gas enters the motor cavity through the air inlet channel and is then discharged from the motor casing through the exhaust channel, and the flow rate of the gas in the air inlet channel is greater than the flow rate of the gas in the exhaust channel, so as to ensure positive pressure in the motor cavity.

[0008] Furthermore, the carbon ring seal with isolation gas is installed on the part of the rotor located between the impeller and the motor housing; the carbon ring seal includes a sleeve, a carbon ring, a carbon ring substrate, an isolation gas inlet channel and a tension spring, the sleeve is installed on the rotor, a plurality of carbon rings are provided and installed on the sleeve, a plurality of annular sealing grooves are opened in the carbon ring substrate, the number of the annular sealing grooves is consistent with that of the carbon rings and they correspond one to one, corresponding carbon rings are installed in the annular sealing grooves, a sealing cavity is formed between the carbon ring substrate and the sleeve, the isolation gas inlet channel is provided on the carbon ring substrate and is connected to the sealing cavity, and the tension spring is installed on the outer wall of the carbon ring.

[0009] Furthermore, the carbon ring is divided into a plurality of carbon ring sectors along its circumferential direction, and any two adjacent carbon ring sectors can be disassembled and combined. A tension spring installation groove is provided on the outer side wall of the carbon ring sector along its circumferential direction. When the plurality of carbon ring sectors are combined together to form a circular carbon ring, the tension spring installation groove is formed by combining the tension spring installation groove with the tension spring installed in it.

[0010] Furthermore, a choke plug is installed in the exhaust channel, which can reduce the flow rate of gas in the exhaust channel to less than the flow rate of gas in the intake channel; a spark particle baffle is installed in the part of the exhaust channel located between the choke plug and the output end of the exhaust channel.

[0011] Furthermore, it also includes a radial bearing and an axial thrust bearing; the outer rings of the radial bearing and the axial thrust bearing are both installed in the motor cavity, and the inner rings of the radial bearing and the axial thrust bearing are both installed on the rotor; the radial bearing and the axial thrust bearing both use air bearings with pure air or inert gas as lubricant.

[0012] Furthermore, it also includes a cooling device, which can be an air-cooling device or an air-cooling plus water-cooling device, and the air-cooling plus water-cooling device includes an air-cooling device and a water-cooling device.

[0013] Furthermore, it also includes a PLC control unit for controlling an explosion-proof air suspension blower based on positive pressure sealing and a frequency converter for controlling the rotation speed of the motor.

[0014] Furthermore, it also includes a temperature sensor, a pressure sensor and an alarm; the temperature sensor, the pressure sensor and the alarm are all explosion-proof products to meet the on-site explosion-proof requirements.

[0015] Furthermore, the explosion-proof air suspension blower based on positive pressure sealing may be a split explosion-proof air suspension blower or an integrated explosion-proof air suspension blower; the split explosion-proof air suspension blower includes an explosion-proof area and a non-explosion-proof area. When the explosion-proof air suspension blower based on positive pressure sealing is a split explosion-proof air suspension blower, the PLC control unit and the frequency converter are installed in the non-explosion-proof area, and the parts of the explosion-proof air suspension blower based on positive pressure sealing other than the PLC control unit and the frequency converter are installed in the explosion-proof area, and the PLC control unit controls the speed of the motor through the frequency converter; The integrated explosion-proof air suspension blower includes a cabinet, in which a first positive pressure sealed cabin and a second positive pressure sealed cabin are arranged. The first positive pressure sealed cabin and the second positive pressure sealed cabin are both filled with pure air or inert gas to ensure positive pressure in the first positive pressure sealed cabin and the second positive pressure sealed cabin. When the explosion-proof air suspension blower based on positive pressure sealing is an integrated explosion-proof air suspension blower, the PLC control unit is installed in the first positive pressure sealed cabin, and the frequency converter is installed in the second positive pressure sealed cabin. The PLC control unit controls the speed of the motor through the frequency converter.

[0016] Furthermore, it also includes an air intake unit and a pressure relief unit; the air intake unit is installed on the outside of the cabinet, and is used to provide pure air or inert gas to the air intake channel, the isolation air intake channel, the first positive pressure sealed cabin and the second positive pressure sealed cabin; the pressure relief unit is installed on the outside of the cabinet, and is used to relieve the pressure of the gas in the first positive pressure sealed cabin and the second positive pressure sealed cabin when the pressure in the first positive pressure sealed cabin and the second positive pressure sealed cabin is higher than the pressure threshold.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. In the present invention, an air intake unit is provided to fill the motor cavity with pure air or inert gas, and a positive pressure is created in the motor cavity to prevent dangerous gases from directly entering the motor cavity through the exhaust passage on the motor housing. Specifically, pure air or inert gas enters the motor cavity through the air intake passage and is then discharged from the motor housing through the exhaust passage. At the same time, the flow rate of the gas in the air intake passage is controlled to be greater than the flow rate of the gas in the exhaust passage to ensure a positive pressure in the motor cavity. Since the gas cannot move from a low pressure to a high pressure, the dangerous gas cannot enter the motor cavity through the exhaust passage on the motor housing.

[0019] 2. In the present invention, a carbon ring seal with isolation gas is installed on the portion of the rotor between the impeller and the motor housing to prevent dangerous gases from entering the motor cavity through the connection between the impeller and the motor. Specifically, isolation gas is filled into the sealing cavity through the isolation gas inlet channel, and the pressure of the isolation gas in the sealing cavity is made greater than the pressure at the connection between the impeller and the motor. Since the gas cannot move from a low pressure to a high pressure, the dangerous gas cannot enter the motor cavity through the connection between the impeller and the motor.

[0020] 3. In the present invention, an explosion-proof air suspension blower based on positive pressure sealing can be a split explosion-proof air suspension blower, wherein a PLC control unit and a frequency converter are installed in a non-explosion-proof area. In the present invention, the parts other than the PLC control unit and the frequency converter are installed in an explosion-proof area. Therefore, there is no need to consider the explosion-proof problem of the PLC control unit and the frequency converter, and the safety of the explosion-proof air suspension blower based on positive pressure sealing provided by the present invention can also be improved; at the same time, since the temperature, humidity, dust and other environments in the non-explosion-proof area are better than those in the explosion-proof area, installing the PLC control unit and the frequency converter in the non-explosion-proof area can also greatly extend the service life of the PLC control unit and the frequency converter.

[0021] 4. Compared with other air suspension blowers, the present invention does not install a cooling impeller on the rotor, which reduces the load on the rotor and improves the working efficiency of the motor.

[0022] 5. In the present invention, the explosion-proof air suspension blower based on positive pressure sealing provided by the present invention can be cooled by air cooling or air cooling plus water cooling, which can better control the temperature of the present invention during operation, thereby extending the service life of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 A schematic cross-sectional structure diagram of an explosion-proof air suspension blower based on positive pressure sealing provided by the present invention;

[0025] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0026] Figure 3 A gas flow diagram in the explosion-proof air suspension blower based on positive pressure sealing provided by the present invention;

[0027] Figure 4 A front view of a split explosion-proof air suspension blower provided in Example 1 of the present invention;

[0028] Figure 5 A front view of an integrated explosion-proof air suspension blower provided in Example 2 of the present invention;

[0029] Figure 6 A side view of an integrated explosion-proof air suspension blower provided in Example 2 of the present invention;

[0030] Figure 7 The overall structural diagram of the air intake unit in the explosion-proof air suspension blower based on positive pressure sealing provided by the present invention;

[0031] In the figure: 1-impeller; 2-volute; 3-intake channel; 4-rotor; 5-heat dissipation convex and concave surface; 6-motor housing; 7-exhaust channel; 8-spark particle partition; 9-blocking plug; 10-radial bearing; 11-axial thrust bearing; 12-carbon ring seal; 13-operation panel; 14-cabinet; 15-PLC control unit; 16-PLC communication unit; 17-alarm; 18-pressure relief unit; 19-second pressure test point; 20-first pressure test point; 21-third pressure test point; 22-frequency converter; 23-air inlet; 24-third outlet pipe; 25-second outlet pipe; 26-first outlet pipe; 27-fourth outlet pipe force test point; 28-fifth pressure test point; 29-sixth pressure test point; 30-pressure gauge; 31-intake unit; 32-intake pipe; 33-third temperature test point; 34-second temperature test point; 35-first temperature test point; 36-fourth temperature test point; 37-first positive pressure sealed cabin; 38-second positive pressure sealed cabin; 39-first explosion-proof junction box; 40-second explosion-proof junction box; 41-stator; 201-process gas outlet; 202-volute chamber; 203-process gas inlet; 1201-isolation gas inlet channel; 1202-carbon ring matrix; 1203-carbon ring; 1204-sleeve; 1205-tension spring. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0035] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, the numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0036] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0037] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0038] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0039] Embodiment 1:

[0040] like Figure 1 As shown, the explosion-proof air suspension blower based on positive pressure sealing provided in this embodiment 1 is a split explosion-proof air suspension blower, comprising an impeller 1, a volute 2, a motor filled with pure air or inert gas, and a carbon ring seal 12 with isolation gas, wherein the impeller 1 is rotatably mounted in the volute 2, and the impeller 1 is connected to the motor; the motor comprises a rotor 4, a stator 41 and a motor housing 6, a motor cavity is arranged in the motor housing 6, the rotor 4 and the stator 41 are both arranged in the motor cavity, the impeller 1 and the carbon ring seal 12 with isolation gas are arranged on the rotor 4; the motor housing 6 is provided with an air inlet channel 3 and an exhaust channel 7 connected to the motor cavity, the pure air or inert gas enters the motor cavity through the air inlet channel 3 and then is discharged from the motor housing 6 through the exhaust channel 7, the flow rate of the gas in the air inlet channel 3 is greater than the flow rate of the gas in the exhaust channel 7, so as to ensure the positive pressure in the motor cavity, after the positive pressure is established in the motor cavity, the flow rate of the gas in the air inlet channel 3 is equal to the flow rate of the gas in the exhaust channel 7.

[0041] Specifically, a volute chamber 202 is provided in the volute 2, and a process gas inlet 203 and a process gas outlet 201 connected to the volute chamber 202 are provided on the volute 2. A plurality of air inlet channels 3 are provided, and the number of the air inlet channels 3 depends on the power and temperature of the motor. When the present embodiment is in working state, the motor drives the impeller 1 to rotate at a high speed to pressurize the outside air entering the volute chamber 202 from the process gas inlet 203. After passing through the volute chamber 202, the pressurized outside air is discharged from the process gas outlet 201 into the process pipeline of the process gas.

[0042] The present embodiment is placed in dangerous places such as petroleum, chemical industry, oil and gas, and medicine. At this time, the outside air may be mixed with dangerous gases. In order to prevent the dangerous gases from directly entering the motor cavity through the exhaust channel 7 on the motor housing 6, pure air or inert gas is input into the motor cavity through the air inlet channel 3. After passing through the motor cavity, the pure air or inert gas will be discharged from the motor housing 6 through the exhaust channel 7. Specifically, the flow direction of the gas in the motor cavity is as follows: Figure 3 As shown, since the flow rate of gas in the intake channel 3 is greater than the flow rate of gas in the exhaust channel 7, the pressure in the motor cavity is always higher than the external pressure. Since the gas cannot move from a low pressure to a high pressure, the dangerous gas cannot enter the motor cavity through the exhaust channel 7 on the motor housing 6, thereby preventing an explosion in this embodiment.

[0043] In addition, when the cooling device is an air cooling device, air cooling can be used to cool this embodiment. The air cooling device includes a heat dissipation convex and concave surface 5. The heat dissipation convex and concave surface 5 is provided on the inner and outer walls of the motor housing 6 to increase the heat dissipation area of ​​the motor housing 6, thereby enhancing the heat dissipation capacity of the motor housing 6. At the same time, when pure air or inert gas is input into the motor cavity, the pure air or inert gas can take away the heat in the motor cavity, and then be discharged from the motor housing 6 through the exhaust channel 7 on the motor housing 6 to ensure the temperature of the motor during normal operation.

[0044] like Figure 2As shown, in this embodiment, the carbon ring seal 12 with isolation gas is installed on the part of the rotor 4 between the impeller 1 and the motor housing 6; the carbon ring seal 12 includes a sleeve 1204, a carbon ring 1203, a carbon ring substrate 1202, an isolation gas inlet channel 1201 and a tension spring 1205, the sleeve 1204 is installed on the rotor 4, a plurality of carbon rings 1203 are provided and installed on the sleeve 1204, a plurality of annular sealing grooves are opened in the carbon ring substrate 1202, the annular sealing grooves are consistent in number and correspond one to one with the carbon rings 1203, the corresponding carbon rings 1203 are installed in the annular sealing grooves, a sealing cavity is formed between the carbon ring substrate 1202 and the sleeve 1204, the isolation gas inlet channel 1201 is provided on the carbon ring substrate 1202 and is connected to the sealing cavity, and the tension spring 1205 is installed on the outer wall of the carbon ring 1203.

[0045] Specifically, the isolation gas includes pure air or inert gas. When the present embodiment is in a stationary state, no isolation gas is injected into the sealing cavity, and the carbon ring 1203 is fitted together with the shaft sleeve 1204 under the action of the tension spring 1205. Since the shaft sleeve 1204 and the carbon ring 1203 cannot be completely concentric, when the present embodiment is in a working state, by injecting isolation gas into the sealing cavity and making the pressure of the isolation gas in the sealing cavity greater than the pressure at the connection between the impeller 1 and the motor, the carbon ring 1203 will be stretched open and When the carbon ring 1203 floats, a tiny gap (i.e., an air film) will be formed between the carbon ring 1203 and the sleeve 1204. At the same time, a small annular groove is opened on the inner wall of each carbon ring 1203. When the isolating gas passes through the small annular groove, a gas vortex will be formed here to isolate the dangerous gas, thereby achieving the purpose of sealing. Since the pressure of the isolating gas in the sealing chamber is greater than the pressure at the connection between the impeller 1 and the motor, and the air film has the function of intercepting flow and preventing leakage, the dangerous gas cannot enter the motor cavity through the connection between the impeller 1 and the motor, thereby further preventing the explosion of this embodiment.

[0046] In this embodiment, the carbon ring 1203 is divided into a plurality of carbon ring fan surfaces along its circumferential direction, and any two adjacent carbon ring fan surfaces can be disassembled and combined. A tension spring installation groove is provided on the outer wall of the carbon ring fan surface along its circumferential direction. When the plurality of carbon ring fan surfaces are combined together to form the carbon ring 1203, the tension spring installation groove is formed by combining the tension spring installation groove, in which the tension spring 1205 is installed.

[0047] First, split the carbon ring 1203 into several carbon ring sectors, and then install the several carbon ring sectors on the shaft sleeve 1204 and combine them together. At this time, the tension spring installation grooves on the several carbon ring sectors are combined to form a tension spring installation groove. Install the tension spring 1205 in the tension spring installation groove, and then fix the several carbon ring sectors together to form the carbon ring 1203, so that the carbon ring 1203 can be more conveniently installed in this embodiment.

[0048] like Figure 1 As shown, in this embodiment, a choke plug 9 is installed in the exhaust channel 7, which can reduce the flow rate of gas in the exhaust channel 7 to be less than the flow rate of gas in the intake channel 3; a spark particle baffle 8 is installed in the part of the exhaust channel 7 located between the choke plug 9 and the output end of the exhaust channel 7.

[0049] By installing a gas blocking plug 9 in the exhaust channel 7, the gas blocking plug 9 can reduce the flow rate of the gas in the exhaust channel 7 to be less than the flow rate of the gas in the intake channel 3, thereby ensuring the positive pressure in the motor cavity; at the same time, a spark particle baffle 8 is installed in the part of the exhaust channel 7 between the gas blocking plug 9 and the output end of the exhaust channel 7, and the spark particle baffle 8 can block the sparks and particles in the motor from moving to the outside of this embodiment, thereby preventing the sparks and particles in the motor from igniting dangerous gases outside this embodiment.

[0050] In this embodiment, a radial bearing 10 and an axial thrust bearing 11 are also included; the outer rings of the radial bearing 10 and the axial thrust bearing 11 are both installed in the motor cavity, and the inner rings of the radial bearing 10 and the axial thrust bearing 11 are both installed on the rotor 4; the radial bearing 10 and the axial thrust bearing 11 both use air bearings with pure air or inert gas as lubricant.

[0051] The radial bearing 10 and the axial thrust bearing 11 can support and position the rotor 4; further, by setting the radial bearing 10 and the axial thrust bearing 11 as air bearings, the friction between the rotor 4 and the bearings can be further reduced, thereby further improving the operating efficiency and service life of the motor; further, the radial bearing 10 and the axial thrust bearing 11 in this embodiment use pure air or inert gas as lubricant, which can prevent explosions from occurring in the radial bearing 10 and the axial thrust bearing 11.

[0052] like Figure 4 As shown, in this embodiment, a PLC control unit 15 for controlling the explosion-proof air suspension blower based on positive pressure sealing and a frequency converter 22 for controlling the rotation speed of the motor are also included.

[0053] Specifically, it also includes a 220V power supply, a 380V power supply and a circuit breaker. The 220V power supply is connected to the PLC control unit 15 through the circuit breaker to provide a 220V power supply voltage for the PLC control unit 15. The 380V power supply is connected to the frequency converter 22 through the circuit breaker to provide a 380V power supply voltage for the frequency converter 22. The frequency converter 22 provides a 380V voltage for the motor. The staff controls the frequency converter 22 by operating the operation panel 13 on the PLC control unit 15, and the frequency converter 22 controls the speed of the motor, thereby realizing the control of the explosion-proof air suspension blower based on positive pressure sealing provided in this embodiment.

[0054] like Figure 4 As shown, in this embodiment, a temperature sensor, a pressure sensor and an alarm 17 are also installed; the temperature sensor, the pressure sensor and the alarm 17 are all explosion-proof products to meet the on-site explosion-proof requirements.

[0055] The temperature sensor includes a first temperature test point 35 and a second temperature test point 34, the first temperature test point 35 is used to detect the temperature of the stator 41 of the motor, and the second temperature test point 34 is used to detect the temperature of the process gas outlet 201; the pressure sensor includes a first pressure test point 20 and a second pressure test point 19, the first pressure test point 20 is used to detect the pressure in the motor cavity, and the second pressure test point 19 is used to detect the pressure in the process gas outlet 201.

[0056] In this embodiment, the split-type explosion-proof air suspension blower includes an explosion-proof area and a non-explosion-proof area. The PLC control unit 15, the PLC communication unit 16 and the frequency converter 22 are installed in the non-explosion-proof area. The parts of the explosion-proof air suspension blower based on positive pressure sealing except for the PLC control unit 15, the PLC communication unit 16 and the frequency converter 22 are installed in the explosion-proof area. The PLC control unit 15 controls the speed of the motor through the frequency converter 22.

[0057] Specifically, it also includes a first explosion-proof junction box 39 and a second explosion-proof junction box 40. The cables led out from the PLC control unit 15 in the non-explosion-proof area are connected to the first explosion-proof junction box 39 through an explosion-proof gland. The cables led out from the first explosion-proof junction box 39 are connected to the temperature sensor, the pressure sensor and the alarm 17. The cables led out from the frequency converter 22 are connected to the second explosion-proof junction box 40 through an explosion-proof gland. The cables led out from the second explosion-proof junction box 40 are connected to the motor. The explosion-proof gland is composed of a stainless steel sleeve, a rubber ring and a locking nut.

[0058] By installing the PLC control unit 15, the PLC communication unit 16 and the frequency converter 22 in a non-explosion-proof area, and installing the parts of this embodiment except the PLC control unit 15, the PLC communication unit 16 and the frequency converter 22 in an explosion-proof area, there is no need to consider the explosion-proof problem of the PLC control unit 15, the PLC communication unit 16 and the frequency converter 22, and the safety of the explosion-proof air suspension blower based on positive pressure sealing provided by the present invention can also be improved.

[0059] like Figure 4 and Figure 7 As shown, in this embodiment, an air intake unit 31 and a pressure relief unit 18 are also included; the air intake unit 31 provides pure air or inert gas to the air intake channel 3 and the isolation gas air intake channel 1201, and the pressure relief unit 18 relieves pressure in this embodiment.

[0060] In this embodiment, when the cooling device is an air-cooling plus water-cooling device, the air-cooling plus water-cooling method can be used to cool this embodiment. The water-cooling device includes an explosion-proof water cooler, a first water circuit, a second water circuit and a third water circuit. The water inlet of the first water circuit, the water inlet of the second water circuit and the water inlet of the third water circuit are all connected to the output end of the explosion-proof water cooler, and the water outlet of the first water circuit, the water outlet of the second water circuit and the water outlet of the third water circuit are all connected to the input end of the explosion-proof water cooler, thereby forming a water circuit cycle. Cooling water circulates in the water circuit cycle. The first water circuit passes through the PLC control unit 15, the second water circuit passes through the frequency converter 22, and the third water circuit passes through the motor.

[0061] Furthermore, the explosion-proof air suspension blower based on positive pressure sealing provided in this embodiment can be cooled by air cooling or air cooling plus water cooling, which can better control the temperature of this embodiment during operation, thereby extending the service life of this embodiment.

[0062] Specifically, it also includes a cabinet 14 that can protect this embodiment.

[0063] Embodiment 2:

[0064] like Figure 5 and Figure 6As shown, the explosion-proof air suspension blower based on positive pressure sealing provided in this embodiment 2 is an integrated explosion-proof air suspension blower; the integrated explosion-proof air suspension blower includes a cabinet 14, and a first positive pressure sealed cabin 37 and a second positive pressure sealed cabin 38 are arranged in the cabinet 14, and the first positive pressure sealed cabin 37 and the second positive pressure sealed cabin 38 are filled with pure air or inert gas to ensure the positive pressure in the first positive pressure sealed cabin 37 and the second positive pressure sealed cabin 38. When the explosion-proof air suspension blower based on positive pressure sealing is an integrated explosion-proof air suspension blower, the PLC control unit 15 and the PLC communication unit 16 are installed in the first positive pressure sealed cabin 37, and the frequency converter 22 is installed in the second positive pressure sealed cabin 38, and the PLC control unit 15 controls the speed of the motor through the frequency converter 22.

[0065] Specifically, the first positive pressure sealed cabin 37 is connected to the second positive pressure sealed cabin 38, and an air inlet 23 is provided on the first positive pressure sealed cabin 37 or the second positive pressure sealed cabin 38. The pressure sensor also includes a third pressure test point 21, and the third pressure test point 21 is used to detect the pressure inside the first positive pressure sealed cabin 37 and the second positive pressure sealed cabin 38.

[0066] Specifically, the connecting wires between the 220V power supply and the PLC control unit 15, the connecting wires between the pressure sensor and the PLC control unit 15, the connecting wires between the temperature sensor and the PLC control unit 15, the connecting wires between the alarm 17 and the PLC control unit 15, and the connecting wires between the frequency converter 22 and the PLC control unit 15 all enter the first positive pressure sealed cabin 37 through an explosion-proof flexible tube and are connected to the PLC control unit 15; the connecting wires between the 380V power supply and the motor enter the second positive pressure sealed cabin 38 through an explosion-proof gland and are connected to the frequency converter 22.

[0067] Specifically, the first positive pressure sealed cabin 37 and the second positive pressure sealed cabin 38 are welded by seamless welding technology to ensure the positive pressure state in the first positive pressure sealed cabin 37 and the second positive pressure sealed cabin 38.

[0068] like Figures 5 to 7 As shown, in this embodiment, it also includes an air intake unit 31 and a pressure relief unit 18; the air intake unit 31 is installed on the outside of the cabinet 14, and is used to provide pure air or inert gas to the air inlet 23 of the air intake channel 3, the isolation air intake channel 1201, the first positive pressure sealed cabin 37 and the second positive pressure sealed cabin 38; the pressure relief unit 18 is installed on the outside of the cabinet 14, and is used to relieve the pressure of the gas in the first positive pressure sealed cabin 37 and the second positive pressure sealed cabin 38 when the pressure in the first positive pressure sealed cabin 37 and the second positive pressure sealed cabin 38 is higher than the pressure threshold.

[0069] Specifically, the air intake unit 31 is provided with a pressure gauge 30, an air intake pipe 32, a first air outlet pipe 26, a second air outlet pipe 25 and a third air outlet pipe 24, and valves are installed on the air intake pipe 32, the first air outlet pipe 26, the second air outlet pipe 25 and the third air outlet pipe 24, and the first air outlet pipe 26, the second air outlet pipe 25 and the third air outlet pipe 24 are respectively connected to the air intake channel 3, the isolation air intake channel 1201 and the air inlet 23; the pressure sensor also includes a fourth pressure test point 27, a fifth pressure test point 28 and a sixth pressure test point 29, and the fourth pressure test point 27, the fifth pressure test point 28 and the sixth pressure test are respectively installed on the first air outlet pipe 26, the second air outlet pipe 25 and the third air outlet pipe 24; the temperature sensor also includes a third temperature test point 33 and a fourth temperature test point 36, the third temperature test point 33 is used to detect the temperature of the first positive pressure sealed cabin 37, and the fourth temperature test point 36 is used to detect the temperature of the second positive pressure sealed cabin 38.

[0070] The rest of this embodiment is the same as that of Embodiment 1.

[0071] The explosion-proof air suspension blower based on positive pressure sealing provided in Example 1 and Example 2 has the advantages of energy saving and high efficiency, saving more than 30% electricity compared to traditional blowers, and also has the advantages of no vibration, low noise, no lubricating oil, small equipment installation space, high equipment stability, and long life.

[0072] The explosion-proof air suspension blowers based on positive pressure sealing provided in Example 1 and Example 2 are first introduced with pure air or inert gas before working to ensure that there is no dangerous gas in the motor cavity and that there is positive pressure, and then the explosion-proof air suspension blowers based on positive pressure sealing are started to work.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An explosion-proof air suspension blower based on positive pressure sealing, characterized in that: It comprises an impeller (1), a volute (2), a motor filled with pure air or inert gas, and a carbon ring seal (12) with isolation gas, wherein the impeller (1) is rotatably mounted in the volute (2), and the impeller (1) is connected to the motor; The motor comprises a rotor (4), a stator (41) and a motor housing (6); a motor cavity is arranged in the motor housing (6); the rotor (4) and the stator (41) are both installed in the motor cavity; the impeller (1) and a carbon ring seal (12) with isolation gas are installed on the rotor (4); The motor housing (6) is provided with an air intake channel (3) and an air exhaust channel (7) connected to the motor cavity; the pure air or inert gas enters the motor cavity through the air intake channel (3) and is then discharged from the motor housing (6) through the air exhaust channel (7); the flow rate of the gas in the air intake channel (3) is greater than the flow rate of the gas in the air exhaust channel (7) to ensure a positive pressure in the motor cavity.

2. The explosion-proof air suspension blower based on positive pressure sealing according to claim 1 is characterized in that: The carbon ring seal (12) with isolation gas is installed on the portion of the rotor (4) between the impeller (1) and the motor housing (6); The carbon ring seal (12) comprises a shaft sleeve (1204), a carbon ring (1203), a carbon ring substrate (1202), an isolation gas inlet passage (1201) and a tension spring (1205); the shaft sleeve (1204) is mounted on the rotor (4); a plurality of carbon rings (1203) are provided and mounted on the shaft sleeve (1204); a plurality of annular sealing grooves are provided in the carbon ring substrate (1202); the annular sealing grooves are consistent in number with the carbon rings (1203) and correspond one to one; corresponding carbon rings (1203) are installed in the annular sealing grooves; a sealing cavity is formed between the carbon ring substrate (1202) and the shaft sleeve (1204); the isolation gas inlet passage (1201) is provided on the carbon ring substrate (1202) and connected to the sealing cavity; and the tension spring (1205) is mounted on the outer wall of the carbon ring (1203).

3. The explosion-proof air suspension blower based on positive pressure sealing according to claim 2 is characterized in that: The carbon ring (1203) is divided into a plurality of carbon ring sectors along its circumferential direction, and any two adjacent carbon ring sectors can be disassembled and combined. A tension spring installation slot is provided on the outer wall of the carbon ring sector along its circumferential direction. When the plurality of carbon ring sectors are combined together to form a circular carbon ring (1203), the tension spring installation slots on the plurality of carbon ring sectors are combined to form a tension spring installation groove, in which the tension spring (1205) is installed.

4. The explosion-proof air suspension blower based on positive pressure sealing according to claim 1 is characterized in that: The exhaust passage (7) is provided with a choke (9) which can reduce the flow rate of the gas in the exhaust passage (7) to be smaller than the flow rate of the gas in the intake passage (3); A spark particle baffle (8) is installed in the portion of the exhaust channel (7) between the choke plug (9) and the output end of the exhaust channel (7).

5. The explosion-proof air suspension blower based on positive pressure sealing according to claim 1 is characterized in that: It also includes a radial bearing (10) and an axial thrust bearing (11); The outer rings of the radial bearing (10) and the axial thrust bearing (11) are both mounted in the motor cavity, and the inner rings of the radial bearing (10) and the axial thrust bearing (11) are both mounted on the rotor (4); The radial bearing (10) and the axial thrust bearing (11) both adopt air bearings using pure air or inert gas as lubricant.

6. The explosion-proof air suspension blower based on positive pressure sealing according to claim 1 is characterized in that: It also includes a cooling device, which can be an air-cooling device or an air-cooling plus water-cooling device, and the air-cooling plus water-cooling device includes an air-cooling device and a water-cooling device.

7. The explosion-proof air suspension blower based on positive pressure sealing according to claim 1 is characterized in that: It also includes a PLC control unit (15) for controlling the explosion-proof air suspension blower based on positive pressure sealing and a frequency converter (22) for controlling the rotation speed of the motor.

8. The explosion-proof air suspension blower based on positive pressure sealing according to claim 1 is characterized in that: Also includes a temperature sensor, a pressure sensor and an alarm (17); The temperature sensor, pressure sensor and alarm (17) are all explosion-proof products to meet on-site explosion-proof requirements.

9. An explosion-proof air suspension blower based on positive pressure sealing according to any one of claims 1 to 8, characterized in that: The explosion-proof air suspension blower based on positive pressure sealing can be a split explosion-proof air suspension blower or an integrated explosion-proof air suspension blower; The split-type explosion-proof air suspension blower comprises an explosion-proof area and a non-explosion-proof area. When the explosion-proof air suspension blower based on positive pressure sealing is a split-type explosion-proof air suspension blower, the PLC control unit (15) and the frequency converter (22) are installed in the non-explosion-proof area, and the parts of the explosion-proof air suspension blower based on positive pressure sealing other than the PLC control unit (15) and the frequency converter (22) are installed in the explosion-proof area, and the PLC control unit (15) controls the rotation speed of the motor through the frequency converter (22); The integrated explosion-proof air suspension blower comprises a cabinet (14), wherein a first positive pressure sealed cabin (37) and a second positive pressure sealed cabin (38) are arranged in the cabinet (14), wherein the first positive pressure sealed cabin (37) and the second positive pressure sealed cabin (38) are both filled with pure air or inert gas to ensure positive pressure in the first positive pressure sealed cabin (37) and the second positive pressure sealed cabin (38), and when the explosion-proof air suspension blower based on positive pressure sealing is an integrated explosion-proof air suspension blower, the PLC control unit (15) is installed in the first positive pressure sealed cabin (37), and the frequency converter (22) is installed in the second positive pressure sealed cabin (38), and the PLC control unit (15) controls the rotation speed of the motor through the frequency converter (22).

10. The explosion-proof air suspension blower based on positive pressure sealing according to claim 9, characterized in that: It also includes an air intake unit (31) and a pressure relief unit (18); The air intake unit (31) is installed on the outside of the cabinet (14) and is used to provide pure air or inert gas to the air intake channel (3), the isolation air intake channel (1201), the first positive pressure sealed cabin (37) and the air intake port (23) of the second positive pressure sealed cabin (38); The pressure relief unit (18) is installed on the outside of the cabinet (14) and is used to relieve the pressure of the gas in the first positive pressure sealed cabin (37) and the second positive pressure sealed cabin (38) when the pressure in the first positive pressure sealed cabin (37) and the second positive pressure sealed cabin (38) is higher than a pressure threshold.

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