Electronic flow valve for controlling oxygen delivery

Abstract

The utility model relates to the technical field of flow valves, in particular to an electronic flow valve for controlling oxygen delivery, which comprises a valve body, an air inlet channel, an opening and closing cavity, a communication channel, an adjusting cavity and an air outlet channel are arranged in the valve body, and the air inlet channel, the opening and closing cavity, the communication channel, the adjusting cavity and the air outlet channel are communicated in sequence. An opening and closing valve element is arranged in the opening and closing cavity in a sliding mode and used for controlling connection and disconnection of the air inlet channel and the communication channel, an adjusting valve element is arranged in the adjusting cavity in a sliding mode and used for controlling the opening degree of the adjusting cavity, and a limiting assembly is arranged in the adjusting cavity and used for limiting the moving range of the adjusting valve element. The electronic flow valve has the advantages that the situation that the valve element and the valve body are stuck is reduced, and the failure rate of the electronic flow valve is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of flow valves, in particular to an electronic flow valve for controlling oxygen delivery. Background Art

[0002] A flow valve is a valve used to control the flow of a medium. Currently, the flow valve uses the valve body outlet flow to be fed back to the control room to control the opening of the valve core, thereby achieving regulation and control of the valve body outlet output flow.

[0003] In the related art, a Chinese patent with authorization announcement number CN204610883U provides an electronic flow valve for controlling oxygen delivery, which includes a valve body, an air intake channel, an oxygen outlet and a valve body are arranged in the valve body, a sealing body of the valve core is used to be tightly matched with the air intake channel, and a DC motor is arranged outside the valve body, and the DC motor is used to drive the valve core to move. The DC motor drives the valve core to move in the air intake channel inside the valve body, and changes the gap distance between the sealing body of the valve core and the inner wall of the air intake channel inside the valve body through displacement, thereby achieving the effect of controlling opening and closing and the flow size.

[0004] In the process of implementing the present application, the inventors found that there are at least the following problems in this technology: when the DC motor drives the valve core to move to close the air intake channel, the DC motor may over-rotate, causing the valve core to be stuck in the air intake channel, resulting in a high failure rate of the electronic flow valve. Utility Model Content

[0005] In order to reduce the possibility of the valve core and the valve body getting stuck and reduce the failure rate of the electronic flow valve, the present application provides an electronic flow valve for controlling oxygen delivery.

[0006] The electronic flow valve for controlling oxygen delivery provided in the present application adopts the following technical solution:

[0007] An electronic flow valve for controlling oxygen delivery comprises a valve body, wherein an air inlet channel, an opening and closing chamber, a connecting channel, a regulating chamber and an air outlet channel are arranged in the valve body, wherein the air inlet channel, the opening and closing chamber, the connecting channel, the regulating chamber and the air outlet channel are sequentially connected, an opening and closing valve core is slidingly arranged in the opening and closing chamber, and the opening and closing valve core is used to control the on-off of the air inlet channel and the connecting channel, an regulating valve core is slidingly arranged in the regulating chamber, and the regulating valve core is used to control the opening of the regulating chamber, and a limit assembly is arranged in the regulating chamber, and the limit assembly is used to limit the moving range of the regulating valve core.

[0008] By adopting the above technical scheme, when the gas enters the valve body from the air inlet channel, the gas passes through the opening and closing chamber, the connecting channel and the regulating chamber in sequence, and then discharges from the valve body from the air outlet channel. In the process of the gas flowing from the air inlet channel to the air outlet channel, the opening and closing of the air inlet channel and the connecting channel are controlled by sliding the opening and closing valve core, thereby achieving the effect of controlling the opening and closing of the gas. By sliding the regulating valve core, the gap distance between the regulating valve core and the inner wall of the regulating chamber is changed, thereby achieving the effect of regulating the gas flow rate. In the process of the movement of the regulating valve core, the limit assembly limits the moving range of the regulating valve core, reduces the situation of the regulating valve core and the valve body being stuck, and reduces the failure rate of the electronic flow valve.

[0009] Preferably, a conducting cavity is opened at the bottom end of the opening and closing cavity, the air inlet channel and the connecting channel are interconnected with the conducting cavity, a sealing protrusion is fixedly arranged in the conducting cavity, the top of the sealing protrusion is located in the opening and closing cavity, the end wall of the sealing protrusion is in contact with the inner wall of the conducting cavity, the inner wall of the conducting cavity is used to be in contact with the outer wall of the opening and closing valve core, a sealing groove is opened at the bottom of the opening and closing valve core, the sealing groove is used for inserting the sealing protrusion, and the inner wall of the sealing groove is used to be in contact with the outer wall of the sealing protrusion.

[0010] By adopting the above technical scheme, the air intake channel and the connecting channel are connected through the conducting cavity. When the sealing groove and the sealing protrusion are separated, the gas in the air intake channel flows into the connecting channel. When the sealing protrusion is inserted into the sealing groove, the opening and closing valve core seals the gap between the opening and closing cavity and the connecting cavity. The gas in the air intake channel cannot flow into the connecting channel, and then the effect of controlling the on-off of the gas is achieved by moving the opening and closing valve core.

[0011] Preferably, a sleeve is arranged in the opening and closing cavity, an inner cavity is opened in the sleeve, a coil is arranged in the inner cavity, a group of connecting terminals are arranged on the coil, a fixed iron core is fixedly arranged in the sleeve, a moving iron core is arranged below the fixed iron core, the moving iron core is slidably connected to the inner wall of the sleeve, a spring is arranged between the moving iron core and the fixed iron core, and the moving iron core is fixedly connected to the opening and closing valve core.

[0012] By adopting the above technical solution, when the connecting terminal is energized, the coil generates electromagnetic force to move the moving iron core. When the connecting terminal is de-energized, the moving iron core is reset under the action of the spring, thereby achieving the effect that the moving iron core drives the opening and closing valve core to move in the opening and closing cavity.

[0013] Preferably, a connecting sleeve is fixedly provided at one end of the regulating valve core away from the opening and closing cavity, and a driving seat is fixedly provided at one end of the connecting sleeve away from the regulating valve core. A driving screw is penetrated through the driving seat, and the driving screw is threadedly connected to the driving seat. One end of the driving screw is rotatably connected to the valve body, and the other end of the driving screw is located in the connecting sleeve, and the limiting assembly is arranged between the driving screw and the driving seat.

[0014] By adopting the above technical solution, when the driving screw and the valve body rotate relative to each other, the driving seat drives the connecting sleeve to move along the length direction of the driving screw, and the connecting sleeve drives the regulating valve core to move along the length direction of the driving screw, thereby changing the gap distance between the regulating valve core and the inner wall of the regulating chamber. When the regulating valve core moves to a certain position, the limit assembly restricts the driving seat from continuing to move, thereby achieving the effect of limiting the movement range of the regulating valve core.

[0015] Preferably, a plurality of guide grooves are provided on the inner wall of the regulating cavity, guide blocks are slidably arranged in the guide grooves, and the guide blocks are fixedly connected to the driving seat.

[0016] By adopting the above technical solution, when the driving screw and the valve body rotate relative to each other, the driving seat is not easy to rotate synchronously with the driving screw under the limiting action of the guide block, and thus the driving seat and the driving screw rotate relative to each other while the driving seat and the driving screw move relative to each other.

[0017] Preferably, the driving screw is located on one end outside the connecting sleeve and a driving shaft is fixedly provided, the driving shaft passes through the end wall of the valve body, the driving shaft is rotatably connected to the valve body, the driving shaft is located on one end outside the valve body and a transmission gear is fixedly provided, a driving motor is provided outside the valve body, a driving gear is fixedly provided on the output shaft of the driving motor, and the driving gear is meshed with the transmission gear.

[0018] By adopting the above technical solution, the driving motor drives the driving gear to rotate, the driving gear rotation drives the transmission gear rotation, the transmission gear rotation drives the driving shaft rotation, and the driving shaft rotation drives the driving screw rotation.

[0019] Preferably, the limit assembly includes a baffle and a pressure sensor, the baffle is fixedly arranged on one end of the driving screw located in the connecting sleeve, and the pressure sensor is fixedly arranged on one end of the driving seat facing the baffle.

[0020] By adopting the above technical solution, when the driving seat moves to the point where the pressure sensor abuts against the baffle, the pressure sensor sends a signal to stop the driving motor.

[0021] Preferably, the limiting assembly comprises a rubber layer, and the rubber layer fixes the baffle toward one end of the driving seat.

[0022] By adopting the above technical solution, when the driving motor over-rotates, the driving seat continues to move to extrude the rubber layer, so that the pressure sensor is not easily damaged by extrusion.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. By setting the valve body, air inlet channel, opening and closing chamber, connecting channel, regulating chamber, air outlet channel, opening and closing valve core and limit assembly, the situation of the regulating valve core and the valve body getting stuck is reduced, and the failure rate of the electronic flow valve is reduced;

[0025] 2. The effect of controlling the on-off of gas is achieved by setting the conduction cavity, sealing protrusion and sealing groove;

[0026] 3. The effect of the opening and closing valve core moving in the opening and closing cavity is achieved by arranging a sleeve, an inner cavity, a coil, a terminal, a fixed iron core, a moving iron core and a spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a cross-sectional view of an electronic flow valve for controlling oxygen delivery in an embodiment of the present application.

[0028] Figure 2 It is a cross-sectional view showing the connection relationship between the valve body and the opening and closing valve core in the embodiment of the present application.

[0029] Figure 3 It is a cross-sectional view showing the positional relationship between the sealing protrusion and the conduction cavity in the embodiment of the present application.

[0030] Figure 4 It is a cross-sectional view showing the positional relationship between the opening and closing valve core and the conduction cavity in the embodiment of the present application.

[0031] Figure 5 It is a cross-sectional view showing the connection relationship between the valve body and the regulating valve core in the embodiment of the present application.

[0032] Figure 6 It is a cross-sectional view showing the positional relationship between the rubber layer and the pressure sensor in the embodiment of the present application.

[0033] Explanation of the reference numerals: 1. valve body; 11. air inlet channel; 12. opening and closing chamber; 13. conduction chamber; 14. connecting channel; 15. regulating chamber; 16. air outlet channel; 2. opening and closing valve core; 21. sealing groove; 22. sealing protrusion; 3. sleeve; 32. coil; 321. inner chamber; 322. terminal; 33. fixed iron core; 34. moving iron core; 35. spring; 4. regulating valve core; 41. connecting sleeve; 42. driving seat; 5. driving screw; 51. driving shaft; 6. limiting assembly; 61. baffle; 62. rubber layer; 63. pressure sensor; 7. guide groove; 71. guide block; 8. driving motor; 81. driving gear; 82. transmission gear. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-6 This application is described in further detail.

[0035] The present application embodiment discloses an electronic flow valve for controlling oxygen delivery. Figures 1 to 6 , comprising a valve body 1, wherein an air outlet channel 16 is provided at the top of the valve body 1, and an air inlet channel 11 is provided at one end of the valve body 1. An opening and closing chamber 12 and an adjusting chamber 15 are provided in the valve body 1, wherein the adjusting chamber 15 is located below the air outlet channel 16, and the adjusting chamber 15 and the air outlet channel 16 are communicated with each other. The opening and closing chamber 12 is located between the adjusting chamber 15 and the air inlet channel 11, and a conducting chamber 13 is provided at the bottom of the opening and closing chamber 12, and a communicating channel 14 is provided between one side of the conducting chamber 13 and the regulating chamber 15, and the other side of the conducting chamber 13 is communicated with the air inlet channel 11. An opening and closing valve core 2 is slidably arranged in the opening and closing chamber 12, and the outer wall of the opening and closing valve core 2 is used to fit with the inner wall of the conducting chamber 13, and a sealing groove 21 is provided at the bottom of the opening and closing valve core 2. The sealing protrusion 22 is integrally formed in the conduction cavity 13, and there is a gap between the left side wall of the sealing protrusion 22 and the inner wall of the conduction cavity 13. The front side wall of the sealing protrusion 22 and the rear side wall of the sealing protrusion 22 are both in contact with the inner wall of the conduction cavity 13 to form a seal, so that the gas can flow from the top of the sealing protrusion 22. The top of the sealing protrusion 22 is located in the opening and closing cavity 12, the sealing groove 21 is used for inserting the sealing protrusion 22, and the inner wall of the sealing groove 21 is used to fit with the outer wall of the sealing protrusion 22. When the outer wall of the opening and closing valve core 2 fits with the inner wall of the conduction cavity 13, and the inner wall of the sealing groove 21 fits with the outer wall of the sealing protrusion 22, the opening and closing valve core 2 cuts off the air intake channel 11 and the connecting channel 14. The regulating valve core 4 is slidably arranged in the regulating chamber 15. The regulating valve core 4 is in a truncated cone shape. The diameter of the regulating valve core 4 at one end close to the connecting passage 14 is smaller than the diameter of the regulating valve core 4 at one end away from the connecting passage 14. The outer wall shape of the regulating valve core 4 corresponds to the inner wall shape of the regulating chamber 15. The regulating valve core 4 is used to control the opening of the regulating chamber 15. The limit assembly 6 is installed in the regulating chamber 15. The limit assembly 6 is used to limit the moving range of the regulating valve core 4. When the gas enters the valve body 1 from the air inlet passage 11, the gas enters the opening and closing chamber 12 through the guidance of the sealing protrusion 22 in the conducting chamber 13. After the gas in the opening and closing chamber 12 enters the regulating chamber 15 through the connecting passage 14, it is discharged from the valve body 1 from the air outlet passage 16. When the opening and closing valve core 2 moves to the sealing groove 21 and separates from the sealing protrusion 22, there is a gap between the top of the sealing protrusion 22 and the opening and closing cavity 12, so that the gas in the air intake channel 11 flows into the connecting channel 14; when the opening and closing valve core 2 moves to the sealing protrusion 22 and is inserted into the sealing groove 21, the opening and closing valve core 2 seals the gap between the opening and closing cavity 12 and the conducting cavity 13. By moving the opening and closing valve core 2, the opening and closing of the air intake channel 11 and the connecting channel 14 is controlled, thereby achieving the effect of controlling the opening and closing of the gas. By sliding the regulating valve core 4, the gap distance between the regulating valve core 4 and the inner wall of the regulating cavity 15 is changed, thereby achieving the effect of adjusting the gas flow rate. During the movement of the regulating valve core 4, the limit assembly 6 limits the moving range of the regulating valve core 4, reduces the situation where the regulating valve core 4 and the valve body 1 are stuck, and reduces the failure rate of the electronic flow valve.

[0036] In order to achieve the effect of the opening and closing valve core 2 moving in the opening and closing cavity 12, refer to Figures 1 to 4 , a sleeve 3 is installed in the opening and closing cavity 12, an inner cavity 321 is provided in the sleeve 3, a coil 32 is installed in the inner cavity 321, a group of terminals 322 are connected to the coil 32, and the terminals 322 pass through the top of the sleeve 3. A fixed iron core 33 is installed in the sleeve 3, a moving iron core 34 is installed below the fixed iron core 33, and the moving iron core 34 is slidably connected to the inner wall of the sleeve 3. A spring 35 is installed between the top of the moving iron core 34 and the bottom of the fixed iron core 33, and the bottom of the moving iron core 34 is fixedly connected to the opening and closing valve core 2. When the terminal 322 is energized, the coil 32 generates an electromagnetic force to move the moving iron core 34. When the terminal 322 is de-energized, the moving iron core 34 is reset under the action of the spring 35, thereby achieving the effect that the moving iron core 34 drives the opening and closing valve core 2 to move in the opening and closing cavity 12.

[0037] In order to achieve the effect of adjusting the valve core 4 moving in the adjusting chamber 15, refer to Figures 1 to 5 , a driving shaft 51 is provided through one end of the valve body 1 away from the air inlet passage 11, and the driving shaft 51 is rotatably connected with the valve body 1. A transmission gear 82 is installed on the end of the driving shaft 51 located outside the valve body 1, and a driving motor 8 is installed outside the valve body 1. A driving gear 81 is installed on the output shaft of the driving motor 8, and the driving gear 81 and the transmission gear 82 are meshed with each other. A driving screw 5 is installed on the end of the driving shaft 51 located inside the valve body 1, and a driving seat 42 is threadedly connected on the driving screw 5. A connecting sleeve 41 is installed between the driving seat 42 and the regulating valve core 4, and the connecting sleeve 41 is sleeved on the driving screw 5. A plurality of guide grooves 7 are provided on the inner wall of the regulating chamber 15, and a guide block 71 is slidably provided in the guide groove 7, and the guide block 71 is welded to the driving seat 42. The driving motor 8 drives the driving gear 81 to rotate, and the driving gear 81 rotates to drive the transmission gear 82 to rotate, and the transmission gear 82 rotates to drive the driving shaft 51 to rotate, and the driving shaft 51 rotates to drive the driving screw 5 to rotate. When the driving screw 5 and the valve body 1 rotate relative to each other, the driving seat 42 is not easy to rotate synchronously with the driving screw 5 under the limiting effect of the guide block 71, and then the driving seat 42 and the driving screw 5 rotate relative to each other, and at the same time, the driving seat 42 and the driving screw 5 move relative to each other. The driving seat 42 drives the connecting sleeve 41 to move along the length direction of the driving screw 5, and the connecting sleeve 41 drives the regulating valve core 4 to move along the length direction of the driving screw 5, thereby changing the gap distance between the regulating valve core 4 and the inner wall of the regulating chamber 15.

[0038] In order to limit the movement range of the regulating valve core 4, refer to Figures 1 to 6The limit assembly 6 includes a baffle 61, a rubber layer 62 and a pressure sensor 63. The baffle 61 is installed on the end of the driving screw 5 located in the connecting sleeve 41, the rubber layer 62 is installed on the end of the baffle 61 facing the driving seat 42, and the pressure sensor 63 is installed on the end of the driving seat 42 facing the baffle 61. When the driving seat 42 moves to the point where the pressure sensor 63 abuts against the baffle 61, the pressure sensor 63 sends a signal to stop the driving motor 8. When the driving motor 8 over-rotates, the driving seat 42 continues to move to squeeze the rubber layer 62, so that the pressure sensor 63 is not easily squeezed and damaged.

[0039] The implementation principle of an electronic flow valve for controlling oxygen delivery in the embodiment of the present application is as follows: when the gas enters the valve body 1 from the air inlet channel 11, the gas first enters the conduction chamber 13. When the sealing groove 21 is separated from the sealing protrusion 22, there is a gap for gas circulation between the top of the sealing protrusion 22 and the opening and closing chamber 12. At this time, the gas enters the opening and closing chamber 12 from the conduction chamber 13, and the gas in the opening and closing chamber 12 enters the connecting channel 14. The gas in the connecting channel 14 enters the regulating chamber 15 for flow regulation and then is discharged from the valve body 1 from the air outlet channel 16. When the terminal 322 is energized, the coil 32 generates an electromagnetic force to move the moving iron core 34. When the terminal 322 is de-energized, the moving iron core 34 is reset under the action of the spring 35, so that the moving iron core 34 drives the opening and closing valve core 2 to move in the opening and closing chamber 12. When the opening and closing valve core 2 moves to the sealing groove 21 and separates from the sealing protrusion 22, the gas in the intake channel 11 flows into the connecting channel 14; when the opening and closing valve core 2 moves to the sealing protrusion 22 and is inserted into the sealing groove 21, the opening and closing valve core 2 seals the gap between the opening and closing chamber 12 and the conduction chamber 13. By moving the opening and closing valve core 2, the opening and closing of the intake channel 11 and the connecting channel 14 is controlled, thereby achieving the effect of controlling the opening and closing of the gas. After the drive motor 8 is started, the drive seat 42 drives the regulating valve core 4 to move, changing the gap distance between the regulating valve core 4 and the inner wall of the regulating chamber 15, thereby achieving the effect of adjusting the gas flow rate. During the movement of the regulating valve core 4, the drive seat 42 and the baffle 61 move relative to each other. When the drive seat 42 moves to the pressure sensor 63 and the baffle 61, the pressure sensor 63 sends a signal to stop the drive motor 8. Reduce the situation where the regulating valve core 4 and the valve body 1 are stuck, and reduce the failure rate of the electronic flow valve.

[0040] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An electronic flow valve for controlling oxygen delivery, comprising a valve body (1), characterized in that: The valve body (1) is provided with an air inlet passage (11), an opening and closing chamber (12), a connecting passage (14), a regulating chamber (15) and an air outlet passage (16); the air inlet passage (11), the opening and closing chamber (12), the connecting passage (14), the regulating chamber (15) and the air outlet passage (16) are connected in sequence; an opening and closing valve core (2) is slidably provided in the opening and closing chamber (12); the opening and closing valve core (2) is used to control the opening and closing of the air inlet passage (11) and the connecting passage (14); a regulating valve core (4) is slidably provided in the regulating chamber (15); the regulating valve core (4) is used to control the opening of the regulating chamber (15); a limit assembly (6) is provided in the regulating chamber (15); the limit assembly (6) is used to limit the moving range of the regulating valve core (4).

2. An electronic flow valve for controlling oxygen delivery according to claim 1, characterized in that: A conducting cavity (13) is provided at the bottom end of the opening and closing cavity (12); the air inlet channel (11) and the communication channel (14) are both connected to the conducting cavity (13); a sealing protrusion (22) is fixedly arranged in the conducting cavity (13); the end wall of the sealing protrusion (22) is in contact with the inner wall of the conducting cavity (13); the top end of the sealing protrusion (22) is located in the opening and closing cavity (12); the inner wall of the conducting cavity (13) is used to be in contact with the outer wall of the opening and closing valve core (2); a sealing groove (21) is provided at the bottom of the opening and closing valve core (2); the sealing groove (21) is used for inserting the sealing protrusion (22); and the inner wall of the sealing groove (21) is used to be in contact with the outer wall of the sealing protrusion (22).

3. An electronic flow valve for controlling oxygen delivery according to claim 2, characterized in that: A sleeve (3) is arranged in the opening and closing cavity (12), an inner cavity (321) is provided in the sleeve (3), a coil (32) is arranged in the inner cavity (321), a group of connecting terminals (322) are arranged on the coil (32), a fixed iron core (33) is fixedly arranged in the sleeve (3), a moving iron core (34) is arranged below the fixed iron core (33), the moving iron core (34) is slidably connected to the inner wall of the sleeve (3), a spring (35) is arranged between the moving iron core (34) and the fixed iron core (33), and the moving iron core (34) is fixedly connected to the opening and closing valve core (2).

4. The electronic flow valve for controlling oxygen delivery according to claim 1, characterized in that: A connecting sleeve (41) is fixedly arranged at one end of the regulating valve core (4) away from the opening and closing chamber (12); a driving seat (42) is fixedly arranged at one end of the connecting sleeve (41) away from the regulating valve core (4); a driving screw (5) is penetrated through the driving seat (42); the driving screw (5) is threadedly connected to the driving seat (42); one end of the driving screw (5) is rotatably connected to the valve body (1); the other end of the driving screw (5) is located in the connecting sleeve (41); and the limit assembly (6) is arranged between the driving screw (5) and the driving seat (42).

5. An electronic flow valve for controlling oxygen delivery according to claim 4, characterized in that: A plurality of guide grooves (7) are provided on the inner wall of the regulating cavity (15), and guide blocks (71) are slidably arranged in the guide grooves (7), and the guide blocks (71) are fixedly connected to the driving seat (42).

6. An electronic flow valve for controlling oxygen delivery according to claim 4, characterized in that: The driving screw rod (5) is located on one end outside the connecting sleeve (41) and a driving shaft (51) is fixedly arranged thereon. The driving shaft (51) passes through the end wall of the valve body (1). The driving shaft (51) is rotatably connected to the valve body (1). A transmission gear (82) is fixedly arranged on one end outside the valve body (1). A driving motor (8) is arranged outside the valve body (1). A driving gear (81) is fixedly arranged on the output shaft of the driving motor (8). The driving gear (81) is meshed with the transmission gear (82).

7. An electronic flow valve for controlling oxygen delivery according to claim 6, characterized in that: The limit assembly (6) comprises a baffle (61) and a pressure sensor (63); the baffle (61) is fixedly arranged on one end of the driving screw (5) located inside the connecting sleeve (41); and the pressure sensor (63) is fixedly arranged on one end of the driving seat (42) facing the baffle (61).

8. An electronic flow valve for controlling oxygen delivery according to claim 7, characterized in that: The limiting assembly (6) further comprises a rubber layer (62), wherein the rubber layer (62) is fixedly provided with one end of the baffle (61) facing the driving seat (42).

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