Sponge cushion assembly and backrest chair

Abstract

The utility model provides a spongy cushion assembly and a backrest chair. The spongy cushion assembly comprises a supporting piece, a first spongy cushion and a second spongy cushion, the supporting piece comprises a first plastic supporting part and a second plastic supporting part, and the first plastic supporting part and the second plastic supporting part are of an integrated structure or a split structure. An arc-shaped reinforcing part is formed between the first plastic supporting part and the second plastic supporting part, extends upwards in an arc shape along the first plastic supporting part and is connected with the second plastic supporting part; and the structural stability of the supporting piece is ensured. The first sponge cushion is connected to the first plastic supporting part and can support the buttocks of the user; according to the sponge pad assembly, the first sponge pad is provided with a plurality of grooves which are communicated with one another and form corresponding runners, so that heat between the hip of a user and the first sponge pad is taken away in the flowing process of gas in the runners, the heat dissipation effect is achieved, the heat dissipation effect of the sponge pad assembly is guaranteed, and the comfort effect of the first sponge pad on the hip of the user is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of backrest chairs, and more particularly to a sponge pad assembly and a backrest chair. Background Technology

[0002] With the development of technology, backrest chairs have become increasingly common in people's lives. These chairs provide support for users' backs and buttocks, and foam padding assemblies are an integral part of them. In existing technology, foam padding assemblies include a support member, a first foam pad, and a second foam pad. The first and second foam pads are connected to different positions on the support member. While the first foam pad supports the user's buttocks, the flat surface of the first foam pad results in poor heat dissipation in existing foam padding assemblies. Utility Model Content

[0003] The purpose of this utility model is to provide a sponge pad assembly and a backrest chair. The support component includes a first plastic support part and a second plastic support part, which can be an integrated structure or a separate structure. An arc-shaped reinforcing part is formed between the first and second plastic support parts, extending upward along the first plastic support part and connecting to the second plastic support part. This improves the structural strength and ensures the structural stability of the support component. The first sponge pad is connected to the first plastic support part and can support the user's buttocks. The first sponge pad has multiple grooves that are interconnected and form corresponding flow channels for gas to pass through. This allows the gas to carry away the heat between the user's buttocks and the first sponge pad during the flow process, thereby achieving a heat dissipation effect and ensuring the heat dissipation effect of the sponge pad assembly, thus improving the comfort of the first sponge pad for the user's buttocks. The second sponge pad is connected to the second plastic support part and can support the user's back. The second sponge pad has at least one functional area, which can be a vibration area, a heating area, or a red light area, to provide functional massage to the user.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a sponge pad assembly for use in a backrest chair, the sponge pad assembly comprising:

[0005] The support component includes a first plastic support portion and a second plastic support portion, wherein the first plastic support portion and the second plastic support portion are an integrated structure or a separate structure; an arc-shaped reinforcing portion is formed between the first plastic support portion and the second plastic support portion, the arc-shaped reinforcing portion extending upward in an arc along the first plastic support portion and connecting to the second plastic support portion;

[0006] The first sponge pad is connected to the first plastic support part and can support the user's buttocks; the first sponge pad has multiple grooves, which are connected to form corresponding flow channels for gas to pass through.

[0007] The second sponge pad is connected to the second plastic support part and can support the user's back; the second sponge pad has at least one functional area, which is a vibration area, a heating area or a red light area.

[0008] Optionally, the first sponge pad is detachably connected to the first plastic support and is located on the upper side of the first plastic support; the lower surface of the first sponge pad is attached to the upper sidewall of the first plastic support, and the upper surface of the first sponge pad is used to contact the user's buttocks and provide a flexible fit to the user's buttocks.

[0009] Optionally, the upper surface of the first sponge pad converges along the middle of the first sponge pad and extends in an arc direction to better fit the user's buttocks.

[0010] Optionally, the groove is formed by a downward indentation of the upper surface of the first sponge pad, and two adjacent grooves are connected.

[0011] The flow channel is provided with a main flow channel and multiple branch flow channels, and the main flow channel is opened in the first sponge pad along the front-back direction;

[0012] Multiple branch channels are disposed on one side of the main channel, and the multiple branch channels are arranged at an angle or perpendicular to the main channel, and the multiple branch channels are respectively connected to different positions of the main channel.

[0013] Optionally, the front end of the main channel is provided with a first figure-eight opening, the first figure-eight opening is connected to the external environment, and the width of the first figure-eight opening gradually decreases along the front-back direction.

[0014] Alternatively, the rear end of the main channel is provided with a second figure-eight opening, which faces the arc-shaped reinforcement and is able to connect to the external environment. The width of the second figure-eight opening gradually expands along the front-to-back direction.

[0015] Optionally, the multiple branch channels are arranged symmetrically along the main channel and converge toward the center of the main channel;

[0016] The main flow channel and the multiple branch channels are arranged at different positions relative to the user's buttocks to dissipate heat from the user's buttocks at multiple locations.

[0017] Optionally, when the first plastic support part contacts the table surface, the lower side wall of the first plastic support part is provided with an anti-slip part, which is used to contact the table surface to prevent the first plastic support part from sliding relative to the table surface;

[0018] The anti-slip part is elongated, concentrically circular, or arc-shaped.

[0019] Optionally, the functional area includes a first functional area, which is a vibration area; the sponge pad assembly further includes a vibration motor, which is connected to the second sponge pad and arranged relative to the first functional area, and the vibration motor outputs vibration energy to the first functional area when in operation.

[0020] Alternatively, the functional area includes a second functional area, which is a heating area; the sponge pad assembly further includes a heating element, which is connected to the second sponge pad and arranged relative to the second functional area, and the heating element outputs heat to the second functional area in the working state;

[0021] Alternatively, the functional area may include a third functional area, which is a red light area; the sponge pad assembly may also include a red light element, which is connected to the second sponge pad and arranged relative to the third functional area, and the red light element outputs red light to the third functional area in the working state.

[0022] Optionally, the sponge pad assembly further includes a controller disposed on the rear sidewall of the first plastic support portion. The controller is electrically connected to a functional component arranged relative to the functional area, which may be a vibration motor, a heating element, or a red light element.

[0023] To achieve the above objectives, the present invention provides the following technical solution: a backrest chair, including the aforementioned sponge pad assembly.

[0024] Compared with the prior art, the beneficial effects of this utility model are:

[0025] This utility model provides a sponge pad assembly and a backrest chair. The support component includes a first plastic support part and a second plastic support part, which can be an integrated structure or a separate structure. An arc-shaped reinforcing part is formed between the first and second plastic support parts, extending upwards along the first plastic support part and connecting to the second plastic support part. This improves the structural strength and stability of the support component. The first sponge pad is connected to the first plastic support part and supports the user's buttocks. The first sponge pad has multiple grooves that are interconnected and form corresponding flow channels for gas to pass through. This allows the gas to carry away heat between the user's buttocks and the first sponge pad during flow, achieving a heat dissipation effect and ensuring the heat dissipation effect of the sponge pad assembly, thus improving the comfort of the first sponge pad for the user's buttocks. The second sponge pad is connected to the second plastic support part and supports the user's back. The second sponge pad has at least one functional area, which can be a vibration area, a heating area, or a red light area, to provide functional massage to the user. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0027] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings. In the following description, the same reference numerals denote the same parts.

[0028] Figure 1 A schematic diagram of a sponge pad assembly according to an embodiment of this application is shown.

[0029] Figure 2 A schematic diagram of a first sponge pad of a sponge pad assembly according to an embodiment of this application is shown.

[0030] Figure 3 A schematic diagram of a support member for a sponge pad assembly according to one embodiment of this application is shown.

[0031] Figure 4 A schematic diagram showing the elongated shape of the anti-slip portion of a sponge pad assembly according to an embodiment of this application is shown.

[0032] Figure 5 A schematic diagram showing the anti-slip portion of a sponge pad assembly according to an embodiment of this application is shown, with the shape of concentric circles.

[0033] Figure 6A schematic diagram showing the anti-slip portion of a sponge pad assembly according to an embodiment of this application is shown, with an arc-shaped profile.

[0034] Figure Labels

[0035] 100. Sponge pad assembly;

[0036] 10. Support component; 11. First plastic support part; 111. Anti-slip part; 12. Second plastic support part; 13. Arc-shaped reinforcement part;

[0037] 20. First sponge pad; 20a. Groove; 20b. Flow channel; 20c. Main flow channel; 20d. Branch flow channel; 20e. First figure-eight opening; 20f. Second figure-eight opening;

[0038] 30. Second sponge pad; 31. Functional area; 311. First functional area; 312. Second functional area; 313. Third functional area;

[0039] 40. Controller. Detailed Implementation

[0040] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0041] Please refer to the attached document. Figures 1-6 This application provides a sponge pad assembly 100, which is applied to a backrest chair and is used to flexibly support the user's buttocks.

[0042] Please refer to the attached document. Figures 1-6In this embodiment, the sponge pad assembly 100 includes a support member 10, a first sponge pad 20, and a second sponge pad 30. The support member 10 includes a first plastic support portion 11 and a second plastic support portion 12. The first plastic support portion 11 and the second plastic support portion 12 are either an integrated structure or a separate structure. An arc-shaped reinforcing portion 13 is formed between the first plastic support portion 11 and the second plastic support portion 12. The arc-shaped reinforcing portion 13 extends upward in an arc along the first plastic support portion 11 and connects to the second plastic support portion 12. This improves the structural strength of the support member 10 and ensures the structural stability of the support member 10. The first sponge pad 20 is connected to the first plastic support part 11 and can support the user's buttocks. The first sponge pad 20 has multiple grooves 20a, which are interconnected and form corresponding flow channels 20b. The flow channels 20b are used for gas passage. This allows the gas to carry away the heat between the user's buttocks and the first sponge pad 20 during the flow of the gas through the flow channels 20b, thereby achieving a heat dissipation effect, ensuring the heat dissipation effect of the sponge pad assembly 100, and improving the comfort effect of the first sponge pad 20 on the user's buttocks. The second sponge pad 30 is connected to the second plastic support part 12 and can support the user's back. The second sponge pad 30 has at least one functional area 31, which is a vibration area, a heating area, or a red light area, to provide functional massage to the user.

[0043] Please refer to the attached document. Figures 1-6 In this embodiment of the application, the support member 10 serves as a support component of the sponge pad assembly 100, and the support member 10 is used to support the first sponge pad 20 and the second sponge pad 30.

[0044] The support member 10 includes a first plastic support portion 11 and a second plastic support portion 12. The first plastic support portion 11 and the second plastic support portion 12 are either an integrated structure or separate structures. An arc-shaped reinforcing portion 13 is formed between the first plastic support portion 11 and the second plastic support portion 12. The arc-shaped reinforcing portion 13 extends upward along the first plastic support portion 11 in an arc shape and connects to the second plastic support portion 12. This allows the second plastic support portion 12 to be connected to the first plastic support portion 11 through the arc-shaped reinforcing portion 13, thereby improving the structural strength of the support member 10 and ensuring the structural stability of the support member 10.

[0045] The first sponge pad 20 is disposed on the upper side of the first plastic support part 11. The first sponge pad 20 is connected to the first plastic support part 11 and can support the user's buttocks so that the user's buttocks can flexibly contact the first sponge pad 20. The first sponge pad 20 is provided with multiple grooves 20a, which are connected to form corresponding flow channels 20b. The flow channels 20b are used for gas to pass through. So that the gas can carry away the heat between the user's buttocks and the first sponge pad 20 during the flow of the gas in the flow channels 20b, thereby achieving a heat dissipation effect, ensuring the heat dissipation effect of the sponge pad assembly 100, and improving the comfort effect of the first sponge pad 20 on the user's buttocks.

[0046] The second sponge pad 30 is disposed on the front side of the second plastic support part 12. The second sponge pad 30 is connected to the second plastic support part 12 and can support the user's back so that the user's back can flexibly contact the second sponge pad 30. The second sponge pad 30 is provided with at least one functional area 31, which is a vibration area, a heating area or a red light area, to perform functional massage on the user.

[0047] Please refer to the attached document. Figures 1-2 In this embodiment, the first sponge pad 20 is detachably connected to the first plastic support portion 11 and is located on the upper side of the first plastic support portion 11, so that the first sponge pad 20 can be connected to or detached from the first plastic support portion 11, improving the ease of replacement of the first sponge pad 20; the lower surface of the first sponge pad 20 is attached to the upper sidewall of the first plastic support portion 11, and the upper surface of the first sponge pad 20 is used to contact the user's buttocks and provide a flexible fit to the user's buttocks, improving the comfort effect of the first sponge pad 20 on the user's buttocks. Optionally, the first sponge pad 20 is detachably connected to the first plastic support portion 11 by adhesive bonding.

[0048] Please refer to the attached document. Figures 1-2 In this embodiment, the upper surface of the first sponge pad 20 converges along the middle of the first sponge pad 20 and extends in an arc direction so that the outer surface contour of the first sponge pad 20 can be adapted to the outer contour of the user's buttocks, so as to better fit the user's buttocks, ensure the fit between the user's buttocks and the first sponge pad 20, and improve the comfort effect of the first sponge pad 20 on the user's buttocks.

[0049] Please refer to the attached document. Figures 1-2In this embodiment, the groove 20a is formed by a downward indentation of the upper surface of the first sponge pad 20, and two adjacent grooves 20a are connected to each other to allow gas to flow along the multiple grooves 20a. The flow channel 20b is provided with a main flow channel 20c and multiple branch flow channels 20d. The main flow channel 20c is opened along the front-to-back direction in the first sponge pad 20; the multiple branch flow channels 20d are arranged on both sides of the main flow channel 20c to allow gas to flow from front to back through the main flow channel 20c to the multiple branch flow channels 20d. The multiple branch flow channels 20d are arranged at an angle or perpendicular to the main flow channel 20c, and the multiple branch flow channels 20d are respectively connected to different positions of the main flow channel 20c to expand the position of the multiple branch flow channels 20d relative to the user's buttocks, thereby facilitating the gas in the multiple branch flow channels 20d to carry away the heat of the user's buttocks relative to the multiple branch flow channels 20d, and improving the comfort effect of the first sponge pad 20 on the user's buttocks.

[0050] When multiple branch channels 20d are arranged at an angle relative to the main channel 20c, the flow direction of the gas in the branch channels 20d is at a certain angle to the main channel 20c. This angle can generate a certain rotation or vortex in the gas during the branching process, which helps the gas mix and flow. When multiple branch channels 20d are arranged perpendicular to the main channel 20c, the perpendicular arrangement of the branch channels 20d can reduce the resistance when the gas enters the branch channels 20d, because the flow direction of the gas is consistent with the axial direction of the branch channels 20d.

[0051] Please refer to the attached document. Figures 1-2 In this embodiment of the application, the front end of the main channel 20c is provided with a first figure-eight opening 20e, which connects to the external environment. The width of the first figure-eight opening 20e gradually narrows along the front-back direction so that the gas in the external environment can gradually accelerate and concentrate when entering the main channel 20c. The narrowing figure-eight opening can reduce the turbulence generated when the gas enters the main channel 20c. Turbulence will cause gas loss and flow instability.

[0052] Alternatively, the rear end of the main channel 20c is provided with a second figure-eight opening 20f, which faces the arc-shaped reinforcement 13 and is able to connect to the external environment. The width of the second figure-eight opening 20f gradually expands along the front-to-back direction to facilitate the smooth discharge of gas from the main channel 20c to the external environment. When the gas is discharged from the main channel 20c, the gradually expanding second figure-eight opening 20f causes the gas to gradually slow down and disperse during discharge, reducing turbulence generated when the gas is discharged from the main channel 20c. Turbulence can lead to energy loss and flow instability.

[0053] Please refer to the attached document. Figures 1-2In this embodiment, multiple diversion channels 20d are symmetrically arranged along the main channel 20c, ensuring that the heat dissipation effect is evenly distributed on both sides of the user's buttocks. The symmetrical diversion channels 20d can evenly guide heat from both sides of the user's buttocks to the main channel 20c, avoiding excessive heat dissipation on one side and insufficient heat dissipation on the other. The multiple diversion channels 20d converge towards the center of the main channel 20c to concentrate the direction of heat flow, allowing heat to more efficiently converge from both sides of the user's buttocks to the main channel 20c and then be discharged through the main channel 20c. The main channel 20c and the multiple diversion channels 20d are arranged at different positions relative to the user's buttocks to dissipate heat from multiple locations, effectively improving the heat dissipation performance of the sponge pad assembly 100 and enhancing user comfort and user experience.

[0054] Please refer to the attached document. Figures 1-6 In this embodiment, when the first plastic support 11 contacts the table surface, an anti-slip part 111 is provided on the lower side wall of the first plastic support 11. The anti-slip part 111 is used to contact the table surface to prevent the first plastic support 11 from sliding relative to the table surface, thus ensuring the stability of the first plastic support 11 relative to the table surface and preventing the user from falling during use. Optionally, the anti-slip part 111 is elongated, concentrically circular, or arc-shaped.

[0055] Please refer to the attached document. Figure 1 In this embodiment, the functional area 31 includes a first functional area 311, which is a vibration area; the sponge pad assembly 100 also includes a vibration motor, which is connected to the second sponge pad 30 and arranged relative to the first functional area 311. When the user's back is arranged relative to the first functional area 311, the vibration motor can transmit the vibration energy output by the motor to the user's back, thereby providing a vibration massage to the user.

[0056] Alternatively, functional area 31 may include a second functional area 312, which is a heating area; the sponge pad assembly 100 may also include a heating element connected to the second sponge pad 30 and arranged relative to the second functional area 312, wherein the heating element outputs heat to the second functional area 312 in the working state; when the user's back is arranged relative to the second functional area 312, the heating element can output heat in the working state and conduct it to the user's back, thereby providing heating and massage to the user.

[0057] Alternatively, functional area 31 may include a third functional area 313, which is a red light area; the sponge pad assembly 100 may also include a red light element connected to the second sponge pad 30 and arranged relative to the third functional area 313. In its working state, the red light element outputs red light to the third functional area 313. When the user's back is positioned relative to the third functional area 313, the red light output by the red light element in its working state is conducted to the user's back, thereby providing red light therapy to the user. Optionally, functional area 31 may integrate a first functional area 311, a second functional area 312, and a third functional area 313.

[0058] Please refer to the attached document. Figure 1 In this embodiment, the sponge pad assembly 100 further includes a controller 40, which is disposed on the rear side wall of the first plastic support portion 11 so that the operating end of the controller 40 is exposed to the external environment. The controller 40 is electrically connected to a functional component arranged relative to the functional area 31. The functional component is a vibration motor, a heating element, or a red light element, so that the controller 40 can control the vibration motor, heating element, or red light element to start or stop, thereby improving the user's operational convenience.

[0059] In a second embodiment of the application, a backrest chair includes a sponge pad assembly 100, which is part of the backrest chair. The backrest chair is used to adjust the contact point between the human body and the seat to obtain a more comfortable angle to reduce user fatigue.

[0060] At this time, the sponge pad assembly 100 includes a support member 10, a first sponge pad 20, and a second sponge pad 30. The support member 10 includes a first plastic support portion 11 and a second plastic support portion 12. The first plastic support portion 11 and the second plastic support portion 12 are either an integrated structure or a separate structure. An arc-shaped reinforcing portion 13 is formed between the first plastic support portion 11 and the second plastic support portion 12. The arc-shaped reinforcing portion 13 extends upward along the first plastic support portion 11 in an arc shape and connects to the second plastic support portion 12. This improves the structural strength of the support member 10 and ensures the structural stability of the support member 10. The first sponge pad 20 is connected to the first plastic support part 11 and can support the user's buttocks. The first sponge pad 20 has multiple grooves 20a, which are interconnected and form corresponding flow channels 20b. The flow channels 20b are used for gas passage. This allows the gas to carry away the heat between the user's buttocks and the first sponge pad 20 during the flow of the gas through the flow channels 20b, thereby achieving a heat dissipation effect, ensuring the heat dissipation effect of the sponge pad assembly 100, and improving the comfort effect of the first sponge pad 20 on the user's buttocks. The second sponge pad 30 is connected to the second plastic support part 12 and can support the user's back. The second sponge pad 30 has at least one functional area 31, which is a vibration area, a heating area, or a red light area, to provide functional massage to the user.

[0061] Compared with the prior art, the beneficial effects of this utility model are:

[0062] This utility model provides a sponge pad assembly 100 and a backrest chair. The support member 10 includes a first plastic support part 11 and a second plastic support part 12, which are either an integrated structure or separate structures. An arc-shaped reinforcing part 13 is formed between the first plastic support part 11 and the second plastic support part 12. The arc-shaped reinforcing part 13 extends upward along the first plastic support part 11 and connects to the second plastic support part 12, thereby improving the structural strength and ensuring the structural stability of the support member 10. A first sponge pad 20 is connected to the first plastic support part 11 and can support the user's buttocks. The first sponge pad 20 has multiple grooves 20a, which are interconnected and form corresponding flow channels 20b for gas passage. This allows the gas to carry away the heat between the user's buttocks and the first sponge pad 20 during the flow of gas through the flow channels 20b, thereby achieving a heat dissipation effect, ensuring the heat dissipation effect of the sponge pad assembly 100, and improving the comfort of the first sponge pad 20 for the user's buttocks. The second sponge pad 30 is connected to the second plastic support part 12 and can support the user's back; the second sponge pad 30 is provided with at least one functional area 31, which is a vibration area, a heating area or a red light area, to perform functional massage on the user.

[0063] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0064] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features.

[0065] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A sponge pad assembly, characterized in that, The foam pad assembly, used in a backrest chair, includes: The support component includes a first plastic support portion and a second plastic support portion, wherein the first plastic support portion and the second plastic support portion are an integrated structure or a separate structure; an arc-shaped reinforcing portion is formed between the first plastic support portion and the second plastic support portion, the arc-shaped reinforcing portion extending upward in an arc along the first plastic support portion and connecting to the second plastic support portion; The first sponge pad is connected to the first plastic support part and can support the user's buttocks; the first sponge pad has multiple grooves, which are connected to form corresponding flow channels for gas to pass through. The second sponge pad is connected to the second plastic support part and can support the user's back; the second sponge pad has at least one functional area, which is a vibration area, a heating area or a red light area.

2. The sponge pad assembly according to claim 1, characterized in that, The first sponge pad is detachably connected to the first plastic support and is located on the upper side of the first plastic support; the lower surface of the first sponge pad is attached to the upper sidewall of the first plastic support, and the upper surface of the first sponge pad is used to contact the user's buttocks and provide a flexible fit to the user's buttocks.

3. The sponge pad assembly according to claim 2, characterized in that, The upper surface of the first sponge pad converges along the middle of the first sponge pad and extends in an arc direction to better fit the user's buttocks.

4. The sponge pad assembly according to claim 2, characterized in that, The groove is formed by the downward indentation of the upper surface of the first sponge pad, and two adjacent grooves are connected. The flow channel is provided with a main flow channel and multiple branch flow channels, and the main flow channel is opened in the first sponge pad along the front-back direction; Multiple branch channels are disposed on one side of the main channel, and the multiple branch channels are arranged at an angle or perpendicular to the main channel, and the multiple branch channels are respectively connected to different positions of the main channel.

5. The sponge pad assembly according to claim 4, characterized in that, The front end of the main channel is provided with a first figure-eight opening, which connects to the external environment, and the width of the first figure-eight opening gradually decreases along the front-to-back direction. Alternatively, the rear end of the main channel is provided with a second figure-eight opening, which faces the arc-shaped reinforcement and is able to connect to the external environment. The width of the second figure-eight opening gradually expands along the front-to-back direction.

6. The sponge pad assembly according to claim 4, characterized in that, The multiple branch channels are symmetrically arranged along the main channel and converge toward the center of the main channel; The main flow channel and the multiple branch channels are arranged at different positions relative to the user's buttocks to dissipate heat from the user's buttocks at multiple locations.

7. The sponge pad assembly according to claim 1, characterized in that, When the first plastic support part contacts the table surface, the lower side wall of the first plastic support part is provided with an anti-slip part, which is used to contact the table surface to prevent the first plastic support part from sliding relative to the table surface; The anti-slip part is elongated, concentrically circular, or arc-shaped.

8. The sponge pad assembly according to claim 1, characterized in that, The functional area includes a first functional area, which is a vibration area; the sponge pad assembly also includes a vibration motor, which is connected to the second sponge pad and arranged relative to the first functional area, and the vibration motor outputs vibration energy to the first functional area when it is in operation. Alternatively, the functional area includes a second functional area, which is a heating area; the sponge pad assembly further includes a heating element, which is connected to the second sponge pad and arranged relative to the second functional area, and the heating element outputs heat to the second functional area in the working state; Alternatively, the functional area may include a third functional area, which is a red light area; the sponge pad assembly may also include a red light element, which is connected to the second sponge pad and arranged relative to the third functional area, and the red light element outputs red light to the third functional area in the working state.

9. The sponge pad assembly according to claim 1, characterized in that, The sponge pad assembly also includes a controller, which is disposed on the rear side wall of the first plastic support portion. The controller is electrically connected to a functional component arranged relative to the functional area, which is a vibration motor, a heating element, or a red light element.

10. A backrest chair, characterized in that, Includes the sponge pad assembly as described in any one of claims 1 to 9.

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