Seat air blowing and suction system and vehicle

Abstract

The utility model discloses a seat air blowing and suction system and a vehicle, the seat air blowing and suction system comprises a ventilation bag, a ventilation sealing layer and a bidirectional ventilator, the ventilation bag is used for being assembled in a seat, the ventilation bag comprises a first contact surface and a second contact surface which are opposite to each other, the first contact surface is provided with a first through hole, and the second contact surface is provided with a second through hole; the second contact surface is provided with a first groove body and a plurality of air ducts communicated with the first groove body and the first through hole; the ventilation sealing layer is used for being connected with a seat, the ventilation sealing layer is attached to the second contact face to seal the air duct, and the ventilation sealing layer is provided with a second through hole corresponding to the first groove body; the two-way ventilator is assembled to the first groove body, communicates with the second through hole and is used for driving gas to circulate between the side, away from the ventilation bag, of the ventilation sealing layer and the first groove body; the bidirectional ventilating fan has the functions of blowing and sucking air, so that the diversified functions of the seat ventilating system can be realized, and the requirements of customers on a blowing system and a sucking system can be met at the same time.

Description

Technical Field

[0001] This utility model relates to the field of seat ventilation technology, and in particular to a seat blowing and suction system and a vehicle. Background Technology

[0002] With the rapid development of the automotive industry, customers have increasingly higher requirements for seat comfort, especially seat ventilation. Existing seat ventilation systems have cooling and dehumidification functions, which can ensure the comfort of drivers and passengers in hot summer weather. However, simple blowing or suction systems can no longer meet the growing needs of customers.

[0003] Therefore, how to realize the diversified functions of seat ventilation systems is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0004] The purpose of this invention is to provide a seat ventilation system and vehicle that can realize the diverse functions of the seat ventilation system, so as to simultaneously meet the customer's needs for both the blowing and suction systems.

[0005] To achieve the above objectives, this utility model provides a seat blowing and suction system, comprising:

[0006] A ventilation bag is used to be installed inside a seat. The ventilation bag includes a first contact surface and a second contact surface that are opposite to each other. The first contact surface has a first through hole, and the second contact surface has a first groove and a plurality of air ducts that connect the first groove and the first through hole.

[0007] A ventilation sealing layer is used to connect with the seat. The ventilation sealing layer is attached to the second contact surface to seal the air duct. The ventilation sealing layer is provided with a second through hole corresponding to the first groove.

[0008] A two-way ventilation fan is assembled to the first slot and connected to the second through hole. The two-way ventilation fan is used to drive the gas to circulate between the ventilation sealing layer on the side away from the ventilation bag and the first slot.

[0009] In one possible implementation, the second contact surface is further provided with an annular groove, which is connected to the first groove, and a stepped surface is formed between the inner circumferential wall of the annular groove and the inner circumferential wall of the first groove.

[0010] The bidirectional ventilation fan includes a fan body and a fixing plate located on the outer periphery of the fan body. The fixing plate can be connected to the stepped surface to fix the fan body to the first slot.

[0011] In one possible implementation, the second through hole allows the fan body to pass through, so that part of the fan body is located on the side of the ventilation sealing layer away from the step surface.

[0012] The side of the fixing plate away from the step surface is flush with the second contact surface, and the cross-sectional diameter of the second through hole perpendicular to its own axis is smaller than the cross-sectional diameter of the fixing plate perpendicular to its own axis, so that the ventilation sealing layer can fit the side of the fixing plate away from the step surface to limit the fixing plate from leaving the annular groove.

[0013] In one possible implementation, a positioning post is provided on the side of the ventilation sealing layer facing the second contact surface, and a positioning groove adapted to the positioning post is provided on the second contact surface, so that the positioning post can be inserted into the positioning groove for positioning of the ventilation sealing layer.

[0014] In one possible implementation, the edge of the ventilation sealing layer is provided with a first protrusion and a second protrusion protruding from the side of the ventilation sealing layer facing the second contact surface. The first protrusion is adapted to the first groove of the seat, and the second protrusion is adapted to the second groove of the seat, so that the edge of the ventilation sealing layer fits against the seat.

[0015] In one possible implementation, the inner circumferential wall of the first tank has an opening that communicates with the air duct, and all openings are evenly distributed along the inner circumferential wall of the first tank.

[0016] In one possible implementation, the bottom surface of the first trough is provided with a third protrusion, and the fan body is provided with a support member at one end facing the bottom surface of the first trough. The support member is provided with a radially extending fourth protrusion in its circumference, and the fourth protrusion abuts against the third protrusion so that there is a gap between the support member and the bottom surface of the first trough.

[0017] In one possible implementation, the ventilation sealing layer has a mounting position on the side facing the second contact surface. The mounting position is located inside the air duct, and a temperature measuring head for detecting gas temperature is provided inside the mounting position. The temperature measuring head is connected to a signal transmitter, which is used to transmit the temperature information detected by the temperature measuring head.

[0018] In one possible implementation, the bidirectional ventilation fan is an integrated structure.

[0019] A vehicle comprising a seat blowing / suction system as described in any of the above.

[0020] Compared to the aforementioned background technology, the seat blowing and suction system provided by this utility model includes a ventilation bag, a ventilation sealing layer, and a bidirectional ventilation fan. The ventilation bag is used to be assembled into the seat and includes a first contact surface and a second contact surface opposite to each other. The first contact surface has a first through hole, and the second contact surface has a first groove and a plurality of air ducts connecting the first groove and the first through hole. The ventilation sealing layer is used to connect with the seat and is attached to the second contact surface to seal the air ducts. The ventilation sealing layer has a second through hole corresponding to the first groove. The bidirectional ventilation fan is assembled to the first groove and connected to the second through hole. The bidirectional ventilation fan is used to drive gas to circulate between the side of the ventilation sealing layer away from the ventilation bag and the first groove.

[0021] Specifically, the first contact surface of the ventilation bag has a first through hole, and the second contact surface of the ventilation bag has a first groove and an air duct. The ventilation sealing layer is attached to the second contact surface to seal the air duct, allowing gas to flow between the first through hole and the first groove through the air duct. By opening a second through hole in the ventilation sealing layer corresponding to the position of the first groove, the bidirectional ventilation fan assembled at the first groove can drive the gas to flow between the side of the ventilation sealing layer away from the ventilation bag and the first groove. The bidirectional ventilation fan has both blowing and suction functions. When the bidirectional ventilation fan is blowing, it can drive the gas to flow through the second through hole, the first groove, and the air duct in sequence to the first through hole. When the bidirectional ventilation fan is suction, it can drive the gas to flow through the first through hole, the air duct, the first groove, and the second through hole in sequence to the side of the ventilation sealing layer away from the ventilation bag. This enables the seat ventilation system to achieve diversified functions, so as to simultaneously meet the customer's needs for both blowing and suction systems. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the seat blowing and suction system provided in this embodiment of the utility model, installed on the seat;

[0024] Figure 2 This is a schematic diagram of the seat blowing and suction system provided in this embodiment of the utility model without the ventilation sealing layer installed;

[0025] Figure 3 This is a schematic diagram of the seat blowing and suction system provided in this embodiment of the utility model without the ventilation sealing layer installed, viewed from another angle.

[0026] Figure 4 This is a schematic diagram of the structure of the fan body installed in the ventilation bag according to an embodiment of the present utility model;

[0027] Figure 5 This is a schematic diagram of the structure of the ventilation bag provided in an embodiment of the present utility model;

[0028] Figure 6 A schematic diagram of the structure of the ventilation sealing layer and the bidirectional ventilation fan provided in this embodiment of the utility model;

[0029] Figure 7 This is a schematic diagram of the structure of the ventilation sealing layer provided in an embodiment of the present invention.

[0030] in:

[0031] 100-Ventilation bag, 110-First contact surface, 111-First through hole, 120-Second contact surface, 121-First groove, 122-Air duct, 123-Annular groove, 124-Step surface, 125-Positioning groove, 126-Third protrusion;

[0032] 200 - Seat, 210 - First recess, 220 - Second recess;

[0033] 300 - Ventilation sealing layer, 310 - Second through hole, 320 - Positioning post, 330 - First protrusion, 340 - Second protrusion, 350 - Mounting position;

[0034] 400-Two-way ventilation fan, 410-Fan body, 411-Support component, 412-Fourth protrusion, 420-Fixing plate;

[0035] 500-Temperature sensor. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] In the description of this utility model, it should be understood that the terms "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of this utility model.

[0039] The purpose of this invention is to provide a seat ventilation system and vehicle that can realize the diverse functions of the seat ventilation system, so as to simultaneously meet the customer's needs for both the blowing and suction systems.

[0040] Please see Figures 1 to 7To achieve the above objectives, this utility model provides a seat blowing and suction system, including a ventilation bag 100, a ventilation sealing layer 300, and a bidirectional ventilation fan 400. The ventilation bag 100 is used to assemble into a seat 200. The ventilation bag 100 includes a first contact surface 110 and a second contact surface 120 facing each other. The seat 200 is provided with seat foam for a person to lean against. The seat foam is located on the side where the first contact surface 110 of the ventilation bag 100 is located. The first contact surface 110 has a first through hole 111. The seat foam has ventilation holes corresponding to the first through hole 111. In wind mode, the gas in the ventilation hole is drawn away along the first through hole 111. In blowing mode, the gas flows toward the ventilation hole to the side of the seat 200 foam away from the ventilation bag 100. The second contact surface 120 is provided with a first groove 121 and a plurality of air ducts 122 connecting the first groove 121 and the first through hole 111. The air ducts 122 guide the flow of gas so that the gas can flow along a preset path and then flow into the first through hole 111. The air ducts 122 can be used for the gas in the first through hole 111 to flow along the air ducts 122 to a preset position for collection, so as to be discharged in a concentrated manner.

[0041] It is understandable that there are usually multiple first through holes 111, and the multiple first through holes 111 are evenly arranged on the first contact surface 110. The air duct 122 can be planned according to the different positions of the first through holes 111. For example, a first air duct can be set to connect the outermost through holes to each other. At the same time, a second air duct with a cross-shaped structure is added. The end of the second air duct is connected to the first air duct to form an air duct 122 with a grid-shaped structure. This facilitates the flow of gas located at the center of the cross-shaped second air duct to multiple positions in the first air duct, and at the same time, it facilitates the flow of gas from multiple positions in the first air duct to the center of the cross-shaped second air duct for collection.

[0042] A ventilation sealing layer 300 is used to connect with the seat 200. The ventilation sealing layer 300 is attached to the second contact surface 120 to seal the air duct 122. The ventilation sealing layer 300 has a second through hole 310 corresponding to the first groove 121. The second through hole 310 is used to allow gas to flow between the side of the ventilation sealing layer 300 away from the ventilation bag 100 and the first groove 121. A bidirectional ventilation fan 400 is assembled to the first groove 121 and communicates with the second through hole 310. The bidirectional ventilation fan 400 adopts an integrated structure and is used to drive gas through the ventilation sealing layer 300 away from the ventilation bag. There is flow between one side of 100 and the first groove 121. The bidirectional ventilation fan 400 includes a rotor that can rotate after being powered on and fan blades connected to the rotor. When the rotor rotates clockwise, it drives the fan blades to rotate clockwise, and the bidirectional ventilation fan 400 is in the suction state. When the rotor rotates counterclockwise, it drives the fan blades to rotate counterclockwise, and the bidirectional ventilation fan 400 is in the blowing state. By replacing the original fan with the bidirectional ventilation fan 400, the system realizes the blowing and suction functions, which can greatly enhance the product competitiveness, increase the selling points of the whole vehicle, and at the same time, without adding other accessories, it can reduce the cost of the product and improve the competitiveness of the product.

[0043] The ventilation bag 100 has a first through hole 111 on its first contact surface 110, and a first groove 121 and an air duct 122 on its second contact surface 120. A ventilation sealing layer 300 is fitted to the second contact surface 120 to seal the air duct 122, allowing gas to flow between the first through hole 111 and the first groove 121 through the air duct 122. By opening a second through hole 310 in the ventilation sealing layer 300 corresponding to the first groove 121, a bidirectional ventilation fan 400 fitted to the first groove 121 can drive gas to flow between the side of the ventilation sealing layer 300 away from the ventilation bag 100 and the first groove 121. The 400 has both blowing and suction functions. When the bidirectional ventilation fan 400 is blowing, it can drive the gas through the second through hole 310, the first groove 121, and the air duct 122 in sequence to the first through hole 111. When the bidirectional ventilation fan 400 is suction, it can drive the gas through the first through hole 111, the air duct 122, the first groove 121, and the second through hole 310 in sequence to the side of the ventilation sealing layer 300 away from the ventilation bag 100. Compared with the ventilation system in the prior art that only has one of the two functions of suction and blowing, it can realize the diversified functions of the seat 200 ventilation system to simultaneously meet the customer's needs for both blowing and suction systems.

[0044] In one possible implementation, the first groove 121 is a circular groove, and the second contact surface 120 is further provided with an annular groove 123. The annular groove 123 is connected to the first groove 121, and the axis of the annular groove 123 is collinear with the axis of the first groove 121. A stepped surface 124 is formed between the inner circumferential wall of the annular groove 123 and the inner circumferential wall of the first groove 121. The bidirectional ventilation fan 400 includes a fan body 410 and a fixing plate 420 located on the outer periphery of the fan body 410. The fixing plate 420 is located in the middle of the fan body 410 in the axial direction of the first groove 121. The fixing plate 420 can be connected to the stepped surface 124 to fix the fan body 410 to the first groove 121. The connection between the fixing plate 420 and the stepped surface 124 can be, but is not limited to, adhesive bonding, as long as the fixing plate 420 and the stepped surface 124 are relatively fixed.

[0045] In one possible implementation, the second through hole 310 allows the fan body 410 to pass through, so that part of the fan body 410 is located on the side of the ventilation sealing layer 300 away from the step surface 124. The side of the fixing plate 420 away from the step surface 124 is flush with the second contact surface 120, and the cross-sectional diameter of the second through hole 310 perpendicular to its own axis is smaller than the cross-sectional diameter of the fixing plate 420 perpendicular to its own axis, so that the ventilation sealing layer 300 can fit against the side of the fixing plate 420 away from the step surface 124 to restrict the fixing plate 420 from disengaging from the annular groove 123.

[0046] When the side of the fixing plate 420 away from the step surface 124 is flush with the second contact surface 120 and the ventilation sealing layer 300 is attached to the second contact surface 120, the ventilation sealing layer 300 can be attached to the side of the fixing plate 420 away from the step surface 124. The cross-sectional diameter of the second through hole 310 is smaller than the cross-sectional diameter of the fixing plate 420, so as to restrict the fixing plate 420 from disengaging from the annular groove 123 in the axial direction of the second through hole 310. At the same time, the second through hole 310 is used to allow part of the fan body 410 located on the side of the fixing plate 420 away from the step surface 124 to pass through, so as to ensure the effect of gas flow between the side of the ventilation sealing layer 300 away from the ventilation bag 100 and the first groove 121.

[0047] In addition, the fixing plate 420 may also protrude partially from the second contact surface 120. A mounting groove adapted to the portion of the fixing plate 420 protruding from the second contact surface 120 is provided on the side of the ventilation sealing layer 300 facing the fixing plate 420, so as to fit with the fixing plate 420 and limit the fixing plate 420. The mounting groove should be connected to the second through hole 310, and a shoulder for fitting with the fixing plate 420 is formed between the inner circumferential surface of the mounting groove and the inner circumferential surface of the second through hole 310.

[0048] In one possible implementation, the ventilation sealing layer 300 has a positioning post 320 on the side facing the second contact surface 120. The second contact surface 120 has a positioning groove 125 adapted to the positioning post 320. The positioning post 320 can be inserted into the positioning groove 125 for positioning the ventilation sealing layer 300. The number of positioning posts 320 and positioning grooves 125 are one-to-one, and two can be used for alignment of the ventilation sealing layer 300 and the second contact surface 120. The end of the positioning post 320 facing the second contact surface 120 can be set as a tapered structure so that the positioning post 320 can enter the positioning groove 125. The depth of the positioning groove 125 should be slightly greater than the length of the positioning post 320 so that the ventilation sealing layer 300 fits against the second contact surface 120.

[0049] In one possible implementation, the ventilation sealing layer 300 has a first protrusion 330 and a second protrusion 340 protruding from the side of the ventilation sealing layer 300 facing the second contact surface 120. The first protrusion 330 is adapted to the first groove 210 of the seat 200, and the second protrusion 340 is adapted to the second groove 220 of the seat 200, so that the edge of the ventilation sealing layer 300 fits against the seat 200, avoiding gaps between the edge of the ventilation sealing layer 300 and the seat 200, and ensuring the flow of gas in the airway. The ventilation sealing layer 300 and the second contact surface 120, as well as the ventilation sealing layer 300 and the seat 200, can be fixed by adhesive bonding. In addition, a sealing strip can be added to the edge of the ventilation sealing layer 300 to further improve the sealing effect between the ventilation sealing layer 300 and the seat 200.

[0050] In one possible implementation, the inner circumferential wall of the first trough 121 has an opening that communicates with the air duct 122. All openings are evenly arranged along the inner circumferential wall of the first trough 121 to make the airflow in the first trough 121 evenly distributed in the circumferential direction, that is, the airflow through each opening is relatively uniform.

[0051] In one possible implementation, the bottom surface of the first groove 121 is provided with a third protrusion 126, and the end of the fan body 410 facing the bottom surface of the first groove 121 is provided with a support member 411. The support member 411 is provided with a radially extending fourth protrusion 412 in the circumference. The fourth protrusion 412 abuts against the third protrusion 126, so that there is a gap between the support member 411 and the bottom surface of the first groove 121. The gap space forms an axial airflow channel. Combined with the negative pressure effect generated by the rotation of the fan blades in the fan body 410, the heat dissipation efficiency of the bottom surface of the first groove 121 can be improved. At the same time, a filter screen that can be installed in the first groove 121 and located in the circumference of the fan body 410 is provided on the side of the fixed plate 420 facing the third protrusion 126. The filter screen can prevent impurities from entering the fan body 410, thereby improving the service life of the fan body 410.

[0052] In one possible implementation, the ventilation sealing layer 300 has a mounting position 350 on the side facing the second contact surface 120. The mounting position 350 is located inside the air duct 122, and a temperature measuring head 500 for detecting gas temperature is provided inside the mounting position 350. The temperature measuring head 500 is connected to a signal transmitter, which is used to transmit the temperature information detected by the temperature measuring head 500 to obtain the temperature information inside the air duct 122 in real time. At the same time, a flow sensor can be added inside the air duct 122 to detect the gas flow rate in real time and adjust the operating speed of the fan body 410 according to the actual gas flow rate and temperature information.

[0053] In addition, this application also provides a vehicle that includes the aforementioned seat 200 air blowing and suction system, which also has all the beneficial effects of the aforementioned seat 200 air blowing and suction system. The other components of the vehicle can be referred to the prior art, and will not be described in detail here.

[0054] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0055] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0056] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. A blowing and suction system for a seat (200), characterized in that, include: A ventilation bag (100) is used to be assembled into a seat (200). The ventilation bag (100) includes a first contact surface (110) and a second contact surface (120) opposite to each other. The first contact surface (110) has a first through hole (111), and the second contact surface (120) has a first groove (121) and a plurality of air ducts (122) communicating with the first groove (121) and the first through hole (111). A ventilation sealing layer (300) is used to connect with the seat (200). The ventilation sealing layer (300) is attached to the second contact surface (120) to seal the air duct (122). The ventilation sealing layer (300) is provided with a second through hole (310) corresponding to the first groove (121). A bidirectional ventilation fan (400) is assembled to the first groove (121) and connected to the second through hole (310). The bidirectional ventilation fan (400) is used to drive gas to circulate between the ventilation sealing layer (300) on the side away from the ventilation bag (100) and the first groove (121).

2. The air blowing and suction system for the seat (200) according to claim 1, characterized in that, The second contact surface (120) is also provided with an annular groove (123), the annular groove (123) is connected to the first groove (121), and a stepped surface (124) is formed between the inner circumferential wall of the annular groove (123) and the inner circumferential wall of the first groove (121). The bidirectional ventilation fan (400) includes a fan body (410) and a fixing plate (420) located on the outer periphery of the fan body (410). The fixing plate (420) can be connected to the stepped surface (124) to fix the fan body (410) to the first groove (121).

3. The air blowing and suction system for the seat (200) according to claim 2, characterized in that, The second through hole (310) allows the fan body (410) to pass through, so that part of the fan body (410) is located on the side of the ventilation sealing layer (300) away from the stepped surface (124); The side of the fixing plate (420) away from the step surface (124) is flush with the second contact surface (120), and the cross-sectional diameter of the second through hole (310) perpendicular to its own axis is smaller than the cross-sectional diameter of the fixing plate (420) perpendicular to its own axis, so that the ventilation sealing layer (300) can fit against the side of the fixing plate (420) away from the step surface (124) to restrict the fixing plate (420) from disengaging from the annular groove (123).

4. The air blowing and suction system for the seat (200) according to claim 1, characterized in that, The ventilation sealing layer (300) has a positioning post (320) on the side facing the second contact surface (120). The second contact surface (120) has a positioning groove (125) adapted to the positioning post (320). The positioning post (320) can be inserted into the positioning groove (125) for positioning the ventilation sealing layer (300).

5. The air blowing and suction system for the seat (200) according to claim 1, characterized in that, The ventilation sealing layer (300) has a first protrusion (330) and a second protrusion (340) protruding from the side of the ventilation sealing layer (300) facing the second contact surface (120) at its edge. The first protrusion (330) is adapted to the first groove (210) of the seat (200), and the second protrusion (340) is adapted to the second groove (220) of the seat (200), so that the edge of the ventilation sealing layer (300) fits against the seat (200).

6. The air blowing and suction system for the seat (200) according to claim 1, characterized in that, The inner circumferential wall of the first trough (121) is provided with an opening that communicates with the air duct (122), and all the openings are evenly arranged along the inner circumferential wall of the first trough (121).

7. The air blowing and suction system for the seat (200) according to claim 2, characterized in that, The bottom surface of the first groove (121) is provided with a third protrusion (126). The fan body (410) is provided with a support member (411) at one end facing the bottom surface of the first groove (121). The support member (411) is provided with a radially extending fourth protrusion (412) in the circumferential direction. The fourth protrusion (412) abuts against the third protrusion (126) so that there is a gap between the support member (411) and the bottom surface of the first groove (121).

8. The air blowing and suction system for the seat (200) according to claim 1, characterized in that, The ventilation sealing layer (300) has a mounting position (350) on the side facing the second contact surface (120). The mounting position (350) is located in the air duct (122), and a temperature measuring head (500) for detecting gas temperature is provided in the mounting position (350). The temperature measuring head (500) is connected to a signal transmitter, which is used to transmit the temperature information detected by the temperature measuring head (500).

9. The air blowing and suction system for the seat (200) according to any one of claims 1-8, characterized in that, The bidirectional ventilation fan (400) is an integrated structure.

10. A vehicle, characterized in that, Includes the seat (200) blowing and suction system as described in any one of claims 1-9.

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