Fresh air supercharging device

Abstract

The utility model provides a fresh air supercharging device, and belongs to the technical field of air conditioners. The fresh air supercharging device comprises a filtering assembly, a connecting pipe and an air blowing assembly. The filtering assembly comprises a shell, a first filter, a second filter and a third filter, the first filter is connected with the outer wall of the shell, the second filter is contained in the shell, the third filter is contained in the second filter, and the first filter, the second filter and the third filter are sequentially communicated to form a filtering channel. The first end of the connecting pipe is connected with the shell and communicates with the filtering channel, and the second end of the connecting pipe communicates with the air blowing assembly. When the outside is a high-dust place with a severe environment, the pressurization and fresh air exchange functions can be provided for a closed working space.

Description

Technical Field

[0001] The present disclosure belongs to the technical field of air conditioners, and particularly relates to a fresh air pressurizing device. Background Art

[0002] In a high-dust environment, the external environment is relatively harsh, and it is necessary to provide the functions of fresh air replacement and pressurization for an enclosed working space.

[0003] In the related art, an air conditioner is usually used to provide the function of fresh air replacement for an enclosed working space. And in order to prevent the high-dust external environment from blocking and polluting the fresh air system of the air conditioner, a filter is often installed in the fresh air system.

[0004] However, in the related art, if a high-efficiency filter is configured in the fresh air system, the filter will be clogged and dirty in a very short time, resulting in too large an operating air resistance of the fresh air system. If a general filter is configured in the fresh air system, it cannot filter smaller particles. Summary of the Utility Model

[0005] Embodiments of the present disclosure provide a fresh air pressurizing device, which can provide the functions of pressurization and fresh air replacement for an enclosed working space when the external environment is a high-dust place with harsh conditions. The technical solution is as follows:

[0006] Embodiments of the present disclosure provide a fresh air pressurizing device, including a filtering component, a connecting pipe, and a blowing component. The filtering component includes a housing, a first filter, a second filter, and a third filter. The first filter is connected to the outer wall of the housing. The second filter is accommodated in the housing. The third filter is accommodated in the second filter. The first filter, the second filter, and the third filter are sequentially communicated to form a filtering channel. The first end of the connecting pipe is connected to the housing and is communicated with the filtering channel. The second end of the connecting pipe is communicated with the blowing component.

[0007] In one implementation manner of the present disclosure, both ends of the second filter are hermetically abutted against the inner wall of the housing. The outer side wall of the second filter faces the first filter, and the inner side wall of the second filter faces the third filter, so that the side wall of the second filter forms part of the filtering channel.

[0008] In another implementation of the present disclosure, the second filter includes an outer filter core, an outer annular end cap, and an outer sealing end cap. The first end of the outer filter core is received in the outer annular end cap, and the internal space of the outer filter core communicates with the internal space of the outer annular end cap. The second end of the outer filter core is received in the outer sealing end cap. One side of the outer annular end cap facing away from the outer filter core is sealingly abutted against the inner wall of the housing. One side of the outer sealing end cap facing away from the outer filter core is sealingly abutted against the inner wall of the housing at the end away from the connecting pipe.

[0009] In yet another implementation of the present disclosure, the two ends of the third filter are respectively an open end and a sealed end. The open end of the third filter is sealingly abutted against the first end of the connecting pipe, and the inner cavity of the open end of the third filter communicates with the inner cavity of the first end of the connecting pipe. The outer sidewall of the third filter faces the inner sidewall of the second filter, so that the sidewall of the third filter forms part of the filtering channel.

[0010] In yet another implementation of the present disclosure, the third filter includes an inner filter core, an inner annular end cap, and an inner sealing end cap. The first end of the inner filter core is received in the inner annular end cap, and the internal space of the inner filter core communicates with the internal space of the inner annular end cap. The second end of the inner filter core is received in the inner sealing end cap. One side of the inner annular end cap facing away from the inner filter core is sealingly abutted against the first end of the connecting pipe.

[0011] In yet another implementation of the present disclosure, the housing includes a first housing and a second housing. The first housing and the second housing are connected to form a flow-through gap therebetween. The flow-through gap communicates with the first filter and the second filter respectively, and the flow-through gap forms part of the filtering channel.

[0012] In yet another implementation of the present disclosure, the side of the first housing facing the second housing has a first limiting cylinder, and the side of the second housing facing the first housing has a second limiting cylinder. The first limiting cylinder and the second limiting cylinder are opposite and spaced apart to form the flow-through gap therebetween. The first ends of the second filter and the third filter are both located in the first limiting cylinder, and the second ends of the second filter and the third filter are both located in the second limiting cylinder.

[0013] In yet another implementation manner of the present disclosure, the connecting pipe includes a pipe body. The first end of the pipe body is inserted into the outer shell, and the first end of the pipe body is clamped between the second filter and the third filter. The second end of the pipe body is connected to the air blowing assembly.

[0014] In yet another implementation manner of the present disclosure, the connecting pipe further includes an outer flange and an inner boss. The outer flange is sleeved on the outer wall of the pipe body, and one end face of the outer flange abuts against the outer wall of the outer shell. The inner boss is located on the inner wall of the pipe body, and one end face of the inner boss abuts against the first end of the third filter.

[0015] In yet another implementation manner of the present disclosure, the connecting pipe further includes a support frame. The support frame is close to the second end of the pipe body, and the support frame is respectively connected to the outer wall of the pipe body and the air blowing assembly.

[0016] The beneficial effects brought by the technical solution provided by the embodiments of the present disclosure are as follows:

[0017] Since the first filter is connected to the outer wall of the outer shell, when the outside air passes through the first filter, large particulate dust in the outside air is filtered under the action of the first filter, thereby completing the first rough filtration. Also, since the second filter is accommodated in the outer shell and the third filter is accommodated in the second filter, and the first filter, the second filter, and the third filter are connected in sequence to form a filtration channel, the outside air enters the filtration channel after being roughly filtered by the first filter, and in the filtration channel, it is sequentially subjected to medium efficiency filtration by the second filter and high efficiency filtration by the third filter, so that medium particulate matter in the outside air is filtered out by the second filter, and small particulate matter in the outside air is filtered out by the third filter. Also, since the first end of the connecting pipe is connected to the outer shell, and the first end of the connecting pipe is communicated with the filtration channel, and the second end of the connecting pipe is communicated with the air blowing assembly, the clean air after three times of filtration can enter the air blowing assembly through the connecting pipe, and finally be blown into the enclosed working space after being pressurized by the air blowing assembly.

[0018] That is to say, when the outside is a high-dust place with a harsh environment, the fresh air pressurizing device can provide pressurization and fresh air replacement functions for the enclosed working space. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1It is a schematic structural diagram of a fresh air pressurizing device provided by an embodiment of the present disclosure;

[0021] Figure 2 It is an assembly schematic diagram of a fresh air pressurizing device provided by an embodiment of the present disclosure;

[0022] Figure 3 It is a schematic structural diagram of a first filter provided by an embodiment of the present disclosure;

[0023] Figure 4 It is a schematic structural diagram of a fresh air pressurizing device provided by an embodiment of the present disclosure.

[0024] The meanings represented by the symbols in the figure are as follows:

[0025] 10. Filter assembly;

[0026] 110. Housing; 111. First housing; 1111. First limiting cylinder; 1112. Circular hoop; 1113. Bayonet; 112. Second housing; 1121. Second limiting cylinder; 1122. Buckle; 113. Flow-through gap; 114. Dust discharge pipe; 120. First filter; 121. Cylindrical housing; 122. Air inlet; 123. Swirl fan; 124. Dust outlet; 125. Air inlet pipe; 130. Second filter; 131. Outer filter core; 132. Outer annular end cover; 133. Outer sealing end cover; 140. Third filter; 141. Inner filter core; 142. Inner annular end cover; 143. Inner sealing end cover.

[0027] 20. Connecting pipe;

[0028] 210. Pipe body; 220. Outer flange; 230. Inner boss; 240. Support frame;

[0029] 30. Blowing assembly;

[0030] 310. Blower; 320. Motor;

[0031] 40. Drainage duckbill valve. Detailed implementation manners

[0032] To make the purpose, technical solutions and advantages of the present disclosure clearer, the following will further describe the embodiments of the present disclosure in detail with reference to the accompanying drawings.

[0033] The embodiments of the present disclosure provide a fresh air pressurizing device, Figure 1 which is a schematic structural diagram of a fresh air pressurizing device provided by an embodiment of the present disclosure, as Figure 1As shown in the figure, it includes a filtering component 10, a connecting pipe 20, and a blower component 30. The filtering component 10 includes a housing 110, a first filter 120, a second filter 130, and a third filter 140. The first filter 120 is connected to the outer wall of the housing 110. The second filter 130 is accommodated in the housing 110, and the third filter 140 is accommodated in the second filter 130. The first filter 120, the second filter 130, and the third filter 140 are connected in sequence to form a filtering channel. The first end of the connecting pipe 20 is connected to the housing 110, and the first end of the connecting pipe 20 is in communication with the filtering channel. The second end of the connecting pipe 20 is in communication with the blower component 30.

[0034] Figure 2 It is an assembly schematic diagram of a fresh air pressurizing device provided by an embodiment of the present disclosure. As Figure 2 shown, when the outside air enters the fresh air pressurizing device, the gas flow path of the outside air flowing through the first filter 120, the second filter 130, and the third filter 140 in sequence in the filtering channel is as Figure 2 indicated by the arrow in the figure.

[0035] Since the first filter 120 is connected to the outer wall of the housing 110, when the outside air passes through the first filter 120, the large particulate dust in the outside air is filtered under the action of the first filter 120, thus completing the first rough filtration. Also, since the second filter 130 is accommodated in the housing 110, the third filter 140 is accommodated in the second filter 130, and the first filter 120, the second filter 130, and the third filter 140 are connected in sequence to form a filtering channel, the outside air enters the filtering channel after the rough filtration by the first filter 120, and in the filtering channel, it passes through the medium - efficiency filtration of the second filter 130 and the high - efficiency filtration of the third filter 140 in sequence. As a result, the medium particulate matter in the outside air is filtered out by the second filter 130, and the small particulate matter in the outside air is filtered out by the third filter 140. Also, since the first end of the connecting pipe 20 is connected to the housing 110, the first end of the connecting pipe 20 is in communication with the filtering channel, and the second end of the connecting pipe 20 is in communication with the blower component 30, the clean air after three - stage filtration can enter the blower component 30 through the connecting pipe 20, and finally, after being pressurized by the blower component 30, it is blown into the enclosed working space.

[0036] That is to say, when the outside environment is a high - dust place with harsh conditions, this fresh air pressurizing device can provide pressurization and fresh air replacement functions for the enclosed working space.

[0037] As can be seen from the foregoing, three - stage filtration of the outside air is achieved through the first filter, the second filter, and the third filter, enabling the fresh air pressurizing device to be applicable to high - dust places. The first filter, the second filter, and the third filter will be introduced separately below.

[0038] Figure 3 It is a schematic structural diagram of a first filter 120 provided by an embodiment of the present disclosure. As Figure 3 shown, in this embodiment, the first filter 120 includes a cylindrical outer shell 121, an air inlet 122, a cyclone fan 123, a dust outlet 124, and an air inlet pipe 125. The cylindrical outer shell 121 is coaxially connected to the air inlet pipe 125. The air inlet 122 is located on the wall of the cylindrical outer shell 121 and faces the cyclone fan 123. The cyclone fan 123 is accommodated in the cylindrical outer shell 121, and the cyclone fan 123 is coaxially arranged with the air inlet pipe 125. The dust outlet 124 is located on the side of the cyclone fan 123 facing away from the air inlet 122. The air inlet pipe 125 is respectively communicated with the inner cavity of the cylindrical outer shell 121 and the inner cavity of the outer shell 110.

[0039] Exemplarily, since the cyclone fan 123 is accommodated in the cylindrical outer shell 121, the cyclone fan 123 is coaxially arranged with the cylindrical outer shell 121, the dust outlet 124 is located on the side of the cyclone fan 123 facing away from the air inlet 122, and the air inlet pipe 125 is respectively communicated with the inner cavity of the cylindrical outer shell 121 and the inner cavity of the outer shell 110, when large particulate dust in the outside air enters the cylindrical outer shell 121 through the air inlet 122, it will be affected by the centrifugal force generated by the rotation of the cyclone fan 123 in the cylindrical outer shell 121. The large particulate dust affected by the centrifugal force is thrown to the vicinity of the inner wall of the cylindrical outer shell 121, and then falls out of the first filter 120 from the dust outlet 124 located on the side of the cyclone fan 123 facing away from the air inlet 122 under the action of its own weight, so that the large particulate dust is discharged. The first rough filtration is completed.

[0040] Refer to again Figure 2 , in this embodiment, both ends of the second filter 130 are hermetically abutted against the inner wall of the outer shell 110. The outer side wall of the second filter 130 faces the first filter 120, and the inner side wall of the second filter 130 faces the third filter 140, so that the side wall of the second filter 130 is a partial filter channel.

[0041] Exemplarily, since the second filter 130 is accommodated in the outer shell 110 in a manner that both ends are hermetically abutted against the inner wall of the outer shell 110, and the side wall of the second filter 130 is a partial filter channel, and the inner side wall of the second filter 130 faces the third filter 140, when the outside air enters the filter channel in the outer shell 110, it will only enter the third filter 140 after passing through the side wall of the second filter 130, and will not escape from other channels. In this way, it is ensured that the outside air can be fully filtered by the filtering part of the side wall of the second filter 130, improving the filtration degree and filtration efficiency.

[0042] Continue to refer to Figure 2, in this embodiment, the second filter 130 includes an outer filter core 131, an outer annular end cap 132, and an outer sealing end cap 133. The first end of the outer filter core 131 is received in the outer annular end cap 132, and the internal space of the outer filter core 131 is in communication with the internal space of the outer annular end cap 132. The second end of the outer filter core 131 is received in the outer sealing end cap 133. The side of the outer annular end cap 132 facing away from the outer filter core 131 is in sealing contact with the inner wall of the housing 110. The side of the outer sealing end cap 133 facing away from the outer filter core 131 is in sealing contact with the inner wall of the housing 110 at the end away from the connection pipe 20.

[0043] Since the two ends of the outer filter core 131 are respectively received in the outer annular end cap 132 and the outer sealing end cap 133, and the two ends of the outer filter core 131 are also in sealing contact with the outer annular end cap 132 and the outer sealing end cap 133 respectively, when the outside air completes a primary coarse filtration at the first filter 120 and enters the filtration channel in the housing 110, the outside air will not pass through the two ends of the outer filter core 131 that are in sealing contact with the outer annular end cap 132 and the outer sealing end cap 133, but will only enter the inner filter core 141 after medium - efficiency filtration through the side wall of the outer filter core 131, avoiding the outside air directly entering the inner filter core 141 without medium - efficiency filtration.

[0044] It should be noted that after the outside air completes medium - efficiency filtration through the outer filter core 131, the filtered dust will be adsorbed on the surface of the filter element of the outer filter core 131. Under the vibration of the fresh - air booster device and the self - weight of the dust, the dust adsorbed on the surface of the filter element of the outer filter core 131 will fall into the inner wall of the housing 110. There is a dust discharge pipe 114 on the inner wall of the housing 110. The fresh - air booster device further includes a drain duckbill valve 40. The drain duckbill valve 40 is connected and communicated with the end of the dust discharge pipe 114 away from the housing 110. The inner cavity of the drain duckbill valve 40 is in communication with the outside environment and the inner cavity of the dust discharge pipe 114 respectively. Therefore, the dust on the inner wall of the housing 110 will accumulate at the drain duckbill valve 40 through the dust discharge pipe 114. When there is more accumulated dust at the drain duckbill valve 40, the accumulated dust will push open the flexible valve nozzle of the drain duckbill valve 40 from the inner side of the housing 110, so that the dust falling into the inner wall of the housing 110 is discharged to the outside environment through the dust discharge pipe 114 and the drain duckbill valve 40, realizing the function of automatic dust discharge, which can effectively reduce the cleaning frequency of the second filter 130 and save the cost of manual cleaning. In addition, installing the drain duckbill valve 40 on the dust discharge pipe 114 can also discharge the moisture in the housing 110 without allowing the dust in the external environment to directly enter the flow - through gap 113, ensuring that the humidity of the filtration channel in the housing 110 is not too high, which helps to improve the filtration effect.

[0045] The dust dropped on the inner wall of the housing 110 is discharged through the dust exhaust pipe 114, thereby realizing the function of self-dust exhaust, which can effectively reduce the cleaning frequency of the second filter 130 and save the cost of manual cleaning.

[0046] It is worth mentioning that both ends of the outer filter core 131 are interference fit with the outer annular end cover 132 and the outer sealing end cover 133. The interference fit method can ensure that the outer filter core 131 can be stably fixed between the outer annular end cover 132 and the outer sealing end cover 133, and can also ensure that the two ends of the outer filter core 131 can be sealed.

[0047] Continue to see Figure 2 In the present embodiment, the two ends of the third filter 140 are an open end and a sealed end respectively. The open end of the third filter 140 is sealed against the first end of the connecting tube 20, and the inner cavity of the open end of the third filter 140 is connected to the inner cavity of the first end of the connecting tube 20. The outer wall of the third filter 140 is opposite to the inner wall of the second filter 130, so that the side wall of the third filter 140 is a partial filtering channel.

[0048] Exemplarily, because the open end of the third filter 140 is sealed against the first end of the connecting tube 20, the other end of the third filter 140 is a sealed end, and the outer wall of the third filter 140 is opposite to the inner wall of the second filter 130, after the outside air enters the filtering channel of the inner cavity of the second filter 130, it will only continue to pass through the side wall of the third filter 140 for high-efficiency filtration. Because the inner cavity of the open end of the third filter 140 is connected to the inner cavity of the first end of the connecting tube 20, the outside air that has passed through the high-efficiency filtration of the third filter 140 can enter the connecting tube 20, so that the clean air that has been filtered three times is sent to the air blowing assembly 30 for pressurization and then transported to the closed working space.

[0049] Continue to see Figure 2 In this embodiment, the third filter 140 includes an inner filter core 141, an inner annular end cap 142 and an inner sealing end cap 143. The first end of the inner filter core 141 is accommodated in the inner annular end cap 142, and the inner space of the inner filter core 141 is communicated with the inner space of the inner annular end cap 142, and the second end of the inner filter core 141 is accommodated in the inner sealing end cap 143. The side of the inner annular end cap 142 facing away from the inner filter core 141 is sealed against the first end of the connecting pipe 20.

[0050] Exemplarily, since both ends of the inner filter element 141 are respectively received in the inner annular end cover 142 and the inner sealing end cover 143, and both ends of the inner filter element 141 are respectively in sealing contact with the inner sealing end cover 143 and the first end of the connecting pipe 20, it can be ensured that the air after the medium - efficiency filtration by the outer filter element 131 will not pass through both ends of the inner filter element 141 which are in sealing contact with the inner sealing end cover 143 and the first end of the connecting pipe 20, but can only enter the inner cavity of the connecting pipe 20 through the inner filter element 141, ensuring that the outside air can enter the inner cavity of the connecting pipe 20 only after the high - efficiency filtration by the inner filter element 141, and ensuring the filtration degree and filtration efficiency.

[0051] It should be noted that both ends of the inner filter element 141 are in interference fit with the inner annular end cover 142 and the inner sealing end cover 143. By using the interference fit method, it can not only ensure that the inner filter element 141 can be stably fixed between the inner annular end cover 142 and the inner sealing end cover 143, but also ensure that both ends of the inner filter element 141 can achieve sealing.

[0052] Continue to refer to Figure 2 , in this embodiment, the housing 110 includes a first housing 111 and a second housing 112. The first housing 111 and the second housing 112 are connected to form a flow - through gap 113 therebetween. The flow - through gap 113 is respectively communicated with the first filter 120 and the second filter 130, and the flow - through gap 113 is a partial filter channel.

[0053] Exemplarily, since the housing 110 is composed of a first housing 111 and a second housing 112 connected coaxially, the second filter 130 and the third filter 140 can be separately assembled with the first housing 111 and the second housing 112 respectively and then assembled together, making the process of installing and accommodating the second filter 130 and the third filter 140 in the inner cavity of the housing 110 convenient. Also, since a flow - through gap 113 is formed between the first housing 111 and the second housing 112, and the flow - through gap 113 is respectively communicated with the first filter 120 and the second filter 130, a partial filter channel connecting the first filter 120 and the second filter 130 can be formed in the inner cavity of the housing, ensuring that the outside air entering the fresh - air booster device can reach the second filter 130 for coarse filtration and medium - efficiency filtration after passing through the first filter 120.

[0054] Summarily, the cylindrical outer shell 121 of the first filter 120 and the inner cavity space of the air inlet pipe 125, the space surrounded by the outer wall surfaces of the first housing 111, the second housing 112, and the outer filter element 131, the solid internal space of the outer filter element 131, and the gap space between the inner wall surface of the outer filter element 131 and the outer wall surface of the inner filter element 141, and the solid internal space of the inner filter element 141 are communicated with each other in sequence, and jointly form the filter channel in the fresh air pressurizing device.

[0055] Continue to refer to Figure 2 , in this embodiment, one side of the first housing 111 facing the second housing 112 has a first limiting cylinder 1111, and one side of the second housing 112 facing the first housing 111 has a second limiting cylinder 1121. The first limiting cylinder 1111 and the second limiting cylinder 1121 are opposite and arranged at intervals to form a flow-through gap 113 between the first limiting cylinder 1111 and the second limiting cylinder 1121. The first ends of the second filter 130 and the third filter 140 are both located within the first limiting cylinder 1111, and the second ends of the second filter 130 and the third filter 140 are both located within the second limiting cylinder 1121.

[0056] Exemplarily, since the first limiting cylinder 1111 in the first housing 111 can accommodate the first ends of the second filter 130 and the third filter 140, the second limiting cylinder 1121 in the second housing 112 can accommodate the second ends of the second filter 130 and the third filter 140, and the first limiting cylinder 1111 and the second limiting cylinder 1121 are opposite and arranged at intervals, the second filter 130 and the third filter 140 can be accurately and quickly installed and accommodated in the inner cavity of the housing 110 by using the first limiting cylinder 1111 and the second limiting cylinder 1121. Also, since a flow-through gap 113 is formed between the first limiting cylinder 1111 and the second limiting cylinder 1121, the settings of the first limiting cylinder 1111 and the second limiting cylinder 1121 will not block the filter channel passing through the first filter 120 and the second filter 130 in sequence, keeping the filter channel between the first filter 120 and the second filter 130 unobstructed.

[0057] Refer to again Figure 1 , optionally, a plurality of circular hoop strips 1112 are arranged on the outer wall surface of the first housing 111, and the plurality of circular hoop strips 1112 extend along the circumference of the outer wall surface of the first housing 111. The housing 110 can be fixed to various devices or objects that need to operate by means of clamping and assembling with a hoop and the circular hoop strips 1112.

[0058] Continue to refer to Figure 1, in this embodiment, the dust exhaust pipe 114 is located on the wall surface of the second housing 112. The drain duckbill valve 40 is connected and communicated with the side of the dust exhaust pipe 114 away from the second housing 112. Through the dust exhaust pipe 114 and the drain duckbill valve 40, the overflow gap 113 is communicated with the external environment.

[0059] Continue to refer to Figure 1 , optionally, a plurality of buckles 1122 are provided on the outer wall surface of the second housing 112 near one end of the first housing 111, and a bayonet 1113 is provided on the outer wall surface of the first housing 111 near one end of the second housing 112. Through the connection method of buckling the buckle 1122 and the bayonet 1113, the detachable connection between the first housing 111 and the second housing 112 is realized.

[0060] Refer to again Figure 2 , in this embodiment, the diameter of the first limiting cylinder 1111 is the same as the diameter of the second limiting cylinder 1121, and the first limiting cylinder 1111 is coaxial with the second limiting cylinder 1121.

[0061] Exemplarily, because the diameter of the first limiting cylinder 1111 is the same as the diameter of the second limiting cylinder 1121 and the first limiting cylinder 1111 is coaxial with the second limiting cylinder 1121, the two ends of the second filter 130 can be accommodated simultaneously and kept stable.

[0062] Continue to refer to Figure 2 , in this embodiment, the connecting pipe 20 includes a pipe body 210. The first end of the pipe body 210 is inserted into the housing 110, and the first end of the pipe body 210 is clamped between the second filter 130 and the third filter 140. The second end of the pipe body 210 is connected to the air blowing assembly 30.

[0063] Exemplarily, because the first end of the pipe body 210 is clamped between the second filter 130 and the third filter 140, and the open end of the third filter 140 is in sealed contact with the open end of the connecting pipe 20, only the clean air that has passed through the first filter 120, the second filter 130, and the third filter 140 three times can enter the inner cavity of the pipe body 210. Also, because the second end of the pipe body 210 is connected to the air blowing assembly 30, the clean air that has passed through three filters can be transported to the air blowing assembly 30, and finally, after being pressurized by the air blowing assembly 30, it is transported to the sealed working space.

[0064] It should be noted that there is an interference fit between the first end of the pipe body 210 and the outer wall surface of the third filter 140 and the side of the first limiting cylinder 1111 away from the outer wall surface of the second filter 130. Through such an interference fit among the three, the third filter 140 can be pressed against the inner cavity of the second filter 130 to keep it stable.

[0065] Continue to refer toFigure 2 In this embodiment, the connecting pipe 20 further includes an outer flange 220 and an inner boss 230. The outer flange 220 is sleeved on the outer wall of the tube body 210, and one end face of the outer flange 220 abuts against the outer wall of the housing 110. The inner boss 230 is located on the inner wall of the tube body 210, and one end face of the inner boss 230 abuts against the first end of the third filter 140.

[0066] For example, because one end face of the outer flange 220 sleeved on the outer wall of the tube body 210 abuts against the outer wall of the housing 110, the connecting tube 20 can be inserted into the tube body 210 of a suitable length in the housing 110 for stable assembly and installation. Because one end face of the inner boss 230 located on the inner wall of the tube body 210 abuts against the first section of the third filter 140, and the first end of the tube body 210 is sandwiched between the second filter 130 and the third filter 140, the third filter 140 can be fixedly installed.

[0067] Continue to see Figure 2 In this embodiment, the connecting pipe 20 further includes a support frame 240. The support frame 240 is close to the second end of the tube body 210, and the support frame 240 is connected to the outer wall of the tube body 210 and the air blowing assembly 30 respectively.

[0068] Exemplarily, because the support frame 240 is connected to the outer wall of the second end of the tube body 210 and the air blowing assembly 30 respectively, the connection between the connecting pipe 20 and the air blowing assembly 30 can be achieved through the support frame 240.

[0069] Figure 4 is a structural schematic diagram of a fresh air boosting device provided in an embodiment of the present disclosure, such as Figure 4 As shown, the blower assembly 30 includes a blower 310 and a motor 320. One end of the blower 310 is connected to an end of the connecting pipe 20 away from the blower assembly 30, and the other end of the blower 310 is connected to the sealed working space. The motor 320 is connected to the blower 310 in a transmission manner.

[0070] For example, because the motor 320 is connected to the blower 310 by transmission, the motor 320 can provide the blower 310 with the power of blowing. And because the two ends of the blower 310 are respectively connected to the connecting pipe 20 and the sealed working space, the blower 310 can be used to provide the air circulation power for filtering for the entire fresh air boosting device, so that the outside air can flow into the first filter 120, the second filter 130 and the third filter 140 in sequence, and the clean air after three filtrations can be finally pressurized at the blower 310 and delivered to the sealed working space.

[0071] The foregoing are only optional embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present disclosure shall be included within the protection scope of the present disclosure.

Claims

1. A fresh air boosting device, characterized in that: It comprises a filter assembly (10), a connecting pipe (20) and an air blowing assembly (30); The filter assembly (10) comprises a housing (110), a first filter (120), a second filter (130) and a third filter (140), wherein the first filter (120) is connected to an outer wall of the housing (110), the second filter (130) is accommodated in the housing (110), and the third filter (140) is accommodated in the second filter (130), and the first filter (120), the second filter (130) and the third filter (140) are sequentially connected to form a filter channel; The first end of the connecting pipe (20) is connected to the housing (110), and the first end of the connecting pipe (20) is in communication with the filter channel, and the second end of the connecting pipe (20) is in communication with the air blowing assembly (30).

2. The fresh air boosting device according to claim 1, characterized in that: The two ends of the second filter (130) are respectively sealed against the inner wall of the housing (110), the outer wall of the second filter (130) is opposite to the first filter (120), and the inner wall of the second filter (130) is opposite to the third filter (140), so that the side wall of the second filter (130) is part of the filtering channel.

3. The fresh air boosting device according to claim 1, characterized in that: The second filter (130) comprises an outer filter core (131), an outer annular end cover (132) and an outer sealing end cover (133); The first end of the outer filter core (131) is accommodated in the outer annular end cover (132), and the internal space of the outer filter core (131) is communicated with the internal space of the outer annular end cover (132), and the second end of the outer filter core (131) is accommodated in the outer sealing end cover (133); A surface of the outer annular end cover (132) facing away from the outer filter core (131) is in sealing contact with the inner wall of the outer shell (110); A surface of the outer sealing end cover (133) facing away from the outer filter core (131) is sealed against an inner wall of an end of the outer shell (110) away from the connecting pipe (20).

4. The fresh air boosting device according to claim 1, characterized in that: The two ends of the third filter (140) are an open end and a sealed end, respectively. The open end of the third filter (140) is sealed against the first end of the connecting tube (20), and the inner cavity of the open end of the third filter (140) is connected to the inner cavity of the first end of the connecting tube (20). The outer wall of the third filter (140) is opposite to the inner wall of the second filter (130), so that the side wall of the third filter (140) is part of the filtering channel.

5. The fresh air boosting device according to claim 1, characterized in that: The third filter (140) comprises an inner filter core (141), an inner annular end cover (142) and an inner sealing end cover (143); The first end of the inner filter core (141) is accommodated in the inner annular end cover (142), and the internal space of the inner filter core (141) is communicated with the internal space of the inner annular end cover (142), and the second end of the inner filter core (141) is accommodated in the inner sealing end cover (143); A surface of the inner annular end cover (142) facing away from the inner filter core (141) is sealed against the first end of the connecting pipe (20).

6. The fresh air boosting device according to claim 1, characterized in that: The housing (110) comprises a first shell (111) and a second shell (112); The first shell (111) and the second shell (112) are connected to form a flow gap (113) between the first shell (111) and the second shell (112), and the flow gap (113) is respectively connected to the first filter (120) and the second filter (130), and the flow gap (113) is part of the filtering channel.

7. The fresh air boosting device according to claim 6, characterized in that: A first limiting cylinder (1111) is provided on one side of the first shell (111) facing the second shell (112), and a second limiting cylinder (1121) is provided on one side of the second shell (112) facing the first shell (111); The first limiting cylinder (1111) and the second limiting cylinder (1121) are arranged opposite to each other and spaced apart, so as to form the flow gap (113) between the first limiting cylinder (1111) and the second limiting cylinder (1121); The first ends of the second filter (130) and the third filter (140) are both located in the first limiting cylinder (1111), and the second ends of the second filter (130) and the third filter (140) are both located in the second limiting cylinder (1121).

8. The fresh air boosting device according to claim 1, characterized in that: The connecting pipe (20) comprises a pipe body (210); The first end of the tube body (210) is inserted into the housing (110), and the first end of the tube body (210) is clamped between the second filter (130) and the third filter (140), and the second end of the tube body (210) is connected to the blowing assembly (30).

9. The fresh air boosting device according to claim 8, characterized in that: The connecting pipe (20) further comprises an outer flange (220) and an inner boss (230); The outer flange (220) is sleeved on the outer wall of the tube body (210), and one end surface of the outer flange (220) abuts against the outer wall of the outer shell (110); The inner boss (230) is located on the inner wall of the tube body (210), and one end surface of the inner boss (230) abuts against the first end of the third filter (140).

10. The fresh air boosting device according to claim 8, characterized in that: The connecting pipe (20) further includes a supporting frame (240); The support frame (240) is close to the second end of the tube body (210), and the support frame (240) is respectively connected to the outer wall of the tube body (210) and the air blowing assembly (30).

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