A phase change-water combined heat storage device based on solar thermal collector coupling

Abstract

The present invention relates to the technical field of solar energy utilization, and specifically discloses a phase-change-water combined heat storage device based on solar thermal collection coupling, including a solar thermal collector and a heat storage device, wherein the heat storage device includes a heat storage device outer tank, a heat storage device inner tank, a partition and a phase-change heat storage ball, wherein the heat storage device inner tank is sleeved in the heat storage device outer tank, the partition is horizontally arranged in the heat storage device inner tank to separate the water storage cavity of the heat storage device inner tank into a high temperature zone and a low temperature zone, a water hole is arranged on the partition, and a plurality of phase-change heat storage balls are placed in the high temperature zone, the heat storage device is located in the high temperature zone and is connected to the water outlet of the solar thermal collector through a water inlet pipe, and the low temperature zone of the heat storage device is connected to the water inlet of the solar thermal collector through a water outlet pipe. The advantages of the present invention are to improve the solar heating guarantee rate and comfort.

Description

Technical Field

[0001] The invention relates to the technical field of solar energy utilization, in particular to a phase change-water combined heat storage device based on solar energy heat collection coupling. Background Art

[0002] Existing solar water heaters use water as the heat storage medium, and use the increase in water temperature (sensible heat) to store heat, so the heat storage capacity is very low; and as the water temperature increases, the heat loss is also more. Using phase change thermal storage materials as the heat storage medium of solar water heaters can greatly improve the heat storage capacity of water heaters. During use, scale will be generated, and the scale will adhere to the phase change material, which will affect heat conduction and thus affect use. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a phase change-water combined heat storage device based on solar heat collection coupling.

[0004] The objective of the present invention is achieved through the following technical solutions: A phase change-water combined heat storage device based on solar thermal collection coupling, comprising a solar thermal collector and a heat storage device, wherein the heat storage device comprises a heat storage device outer tank, a heat storage device inner tank, a partition and a phase change heat storage ball, wherein the heat storage device inner tank is sleeved in the heat storage device outer tank, the partition is horizontally arranged in the heat storage device inner tank to separate the water storage cavity of the heat storage device inner tank into a high temperature zone and a low temperature zone, a water hole is arranged on the partition, and a plurality of the phase change heat storage balls are placed in the high temperature zone, the heat storage device is located in the high temperature zone and is connected to the water outlet of the solar thermal collector through a water inlet pipe, and the low temperature zone of the heat storage device is connected to the water inlet of the solar thermal collector through a water outlet pipe.

[0005] Specifically, a heat-insulating layer is provided between the outer tank of the heat storage device and the inner tank of the heat storage device.

[0006] Specifically, the phase-change heat storage ball includes a shell and a phase-change filler filled in the shell.

[0007] Specifically, the phase change filler includes paraffin wax and graphite powder, and the composition ratio of the paraffin wax to the graphite powder is 9:1.

[0008] Specifically, a cleaning mechanism is provided in the inner tank of the heat storage device, and the cleaning mechanism includes a cleaning bracket and a mounting bracket. Multiple cleaning brackets are arranged on the mounting bracket, and multiple mounting holes are arranged in an array along the length direction of the cleaning bracket. The phase change heat storage balls are placed in the mounting holes one by one, and a sliding hole is provided on the partition. The cleaning bracket is slidably connected to the sliding hole. A cleaning brush assembly is provided at the bottom of the partition, and the cleaning brush assembly is arranged around the sliding hole.

[0009] Specifically, the cleaning bracket is spiral-shaped, two slide grooves are symmetrically arranged at the center of the slide hole, sliders are arranged on both sides of the cleaning bracket, the sliders are slidably connected to the corresponding slide grooves, and the cleaning bracket is rotatably connected to the mounting frame.

[0010] Specifically, limiting brackets are arranged on both sides of the cleaning bracket to limit the phase change heat storage ball in the mounting hole. The limiting bracket includes a fixing ring and a limiting bar. The limiting bar is a hemispherical ring, and its large diameter end is fixed on the fixing ring. The fixing ring is fixed on the cleaning bracket at the periphery of the mounting hole, and the limiting bar is sleeved on the outside of the phase change heat storage ball.

[0011] Specifically, it also includes a driving device, which includes a driving motor and a screw rod. A screw rod nut is provided on the mounting frame, and the screw rod is threadedly connected to the screw rod nut. One end of the screw rod is connected to the output end of the driving motor, and the other end is rotatably connected to the partition. A guide rod is provided in the inner tank of the heat storage device, and the partition is slidably connected to the guide rod.

[0012] Specifically, a plurality of fixing bars are arranged in the shell, and fins are arranged on the fixing bars.

[0013] Specifically, the cleaning brush assembly includes a fixed cylinder and bristles, the bristles are fixed on the inner wall of the fixed cylinder, the fixed cylinder is coaxially arranged with the sliding hole, and the fixed cylinder is fixed on the partition.

[0014] The present invention has the following advantages:

[0015] The phase change-water combined heat storage device selects phase change materials with phase change temperatures within the temperature range of solar collector hot water to ensure that the phase change materials fully absorb heat and change phases, and absorb and store the solar heat collected during the day to the maximum extent, ensuring that there is sufficient heat to heat the room when there is no sun at night. At the same time, graphite powder or metal powder materials with good thermal conductivity are added and used in combination with water heat storage, combining the properties of phase change heat storage materials such as high heat storage density, poor thermal conductivity, and instability with the properties of water sensible heat storage method such as low heat storage density and good thermal conductivity, combining the advantages and disadvantages of the two, maximizing the heat storage density, and realizing continuous and uniform heat storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the heat storage device of the present invention;

[0017] Figure 2 It is a schematic cross-sectional structural diagram of the heat storage device of the present invention;

[0018] Figure 3 It is a schematic diagram of the coordination structure of the cleaning bracket and the phase-change heat storage ball of the present invention;

[0019] Figure 4 It is a schematic diagram of the internal structure of the phase change heat storage ball of the present invention;

[0020] Figure 5 It is a schematic diagram of the limiting bracket structure of the present invention;

[0021] Figure 6 It is a schematic diagram of the partition structure of the present invention;

[0022] In the figure: 1-heat storage, 2-solar collector, 3-radiator, 101-heat storage outer tank, 102-heat storage inner tank, 103-insulation layer, 104-partition, 105-phase change heat storage ball, 1051-shell, 1052-phase change filler, 1053-fixing bar, 1054-fin, 106-cleaning bracket, 107-fixing cylinder, 108-mounting frame, 109-drive motor, 110-screw, 111-screw nut, 112-exhaust valve, 113-drain port, 114-fixing ring, 115-limiting bar, 116-water hole, 117-slide hole, 118-slide groove, 119-slider, 120-mounting hole. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0025] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including a..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0026] The present invention is further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0027] like Figure 1-Figure 6As shown, a phase change-water combined heat storage device 1 based on solar thermal collection coupling includes a solar thermal collector 2 and a heat storage device 1, wherein the heat storage device 1 includes a heat storage device outer tank 101, a heat storage device inner tank 102, a partition 104 and a phase change heat storage ball 105, wherein the heat storage device inner tank 102 is sleeved in the heat storage device outer tank 101, and the partition 104 is horizontally arranged in the heat storage device inner tank 102 to separate the water storage cavity of the heat storage device inner tank 102 into a high temperature zone and a low temperature zone, and a water hole 116 is arranged on the partition 104, and a plurality of the phase change heat storage balls 105 are placed in the high temperature zone, and the heat storage device 1 is located in the high temperature zone and is connected to the water outlet of the solar thermal collector 2 through a water inlet pipe, and the low temperature zone of the heat storage device 1 is connected to the water inlet of the solar thermal collector 2 through a water outlet pipe. In this embodiment, the solar collector 2 absorbs solar energy during the day to heat the water in the solar collector 2. A solenoid valve is provided on the water inlet pipe. After the water in the solar collector 2 is heated to a certain temperature, the solenoid valve is opened to transport the hot water to the high temperature zone of the heat storage 1. The heating and heat collection cycle process causes temperature stratification of the water in the heat storage 1. The temperature of the heat storage 1 decreases from high to low from top to bottom. A phase change heat storage ball 105 is provided in the high temperature zone. The phase change heat storage ball 105 absorbs the heat of the hot water and stores it, so as to maximize the absorption and storage of solar energy collected during the day. The phase change heat storage ball 105 is placed in the high temperature zone at the top of the heat storage 1, which is conducive to the timely absorption of heat by the phase change material and sufficient phase change heat storage, so as to ensure sufficient heat when there is no sun at night. The heat storage 1 of this embodiment can be used with The radiator 3 is used in conjunction with the radiator 3, and the water inlet end of the radiator 3 is connected with the high temperature zone of the heat storage device 1 through a pipe. A heating circulation pump is arranged on the pipe. At night, the hot water in the high temperature zone is passed into the radiator 3 through the heating circulation pump, and the water outlet end of the radiator 3 is connected with the low temperature zone of the heat storage device 1 through a pipe. The cold water of the radiator 3 returns to the low temperature zone of the heat storage device 1 through the pipe. After the hot water in the high temperature zone is transported to the radiator 3, the water in the low temperature zone rises to the high temperature zone. At this time, the phase change heat storage ball 105 releases heat to heat the water and then continues to circulate for heating. The above technical scheme can improve the utilization rate of solar energy. When there is continuous rainy weather, the temperature of the heat storage device 1 is too low and the heat collection cycle does not work, the electric heating rod is started to assist in heating the heat storage device 1, and the heating rod is arranged in the low temperature zone.

[0028] Furthermore, a heat preservation layer 103 is provided between the heat storage outer tank 101 and the heat storage inner tank 102. In this embodiment, the heat preservation layer 103 is provided between the heat storage outer tank 101 and the heat storage inner tank 102 to prevent the heat loss of water.

[0029] Furthermore, the phase change heat storage ball 105 includes a shell 1051 and a phase change filler 1052 filled in the shell 1051, and the phase change filler 1052 includes paraffin and graphite powder, and the composition ratio of the paraffin and graphite powder is 9:1. In this embodiment, the phase change filler 1052 is made of solid material, and the phase change material absorbs heat and melts to complete the heat charging process. The graphite powder can be replaced by metal powder. The phase change material has a large heat storage density and can fully absorb the heat of the water in the heat storage device 1, so that the temperature of the heat storage device 1 is not too high; on the one hand, the temperature of the phase change material is constant during the charging and discharging process, which can alleviate the problems such as large temperature fluctuations in the house caused by large temperature changes during the charging and discharging of the traditional water tank, and improve the heating comfort. On the other hand, the phase change material with added graphite powder or metal powder is wrapped in the heat storage ball and placed in the water area, and is fully in contact with the water, so as to overcome the problems of poor thermal conductivity and insufficient phase change of the phase change heat storage device 1, wherein the paraffin is 9 parts and the graphite powder is 1 part.

[0030] Furthermore, a cleaning mechanism is provided in the heat storage tank 102, and the cleaning mechanism includes a cleaning bracket 106 and a mounting bracket 108. A plurality of cleaning brackets 106 are arranged on the mounting bracket 108, and a plurality of mounting holes 120 are arranged in an array along the length direction of the cleaning bracket 106. The phase change heat storage balls 105 are placed in the mounting holes 120 one by one, and a sliding hole 117 is provided on the partition 104. The cleaning bracket 106 is slidably connected to the sliding hole 117, and a cleaning brush assembly is provided at the bottom of the partition 104, and the cleaning brush assembly is arranged around the sliding hole 117. During the use of the heat storage device 1, scale will be generated. If the scale adheres to the heat storage device inner tank 102, it will not affect the use. However, if the scale is adsorbed on the surface of the phase change heat storage ball 105, it will affect the heat absorption and heat release of the phase change heat storage ball 105. When the scale is adsorbed too much, it will seriously affect the operation of the phase change heat storage ball 105. In this embodiment, a cleaning mechanism is set in the heat storage device 1 to regularly clean the scale attached to the phase change heat storage ball 105. The upper end of the cleaning bracket 106 is connected to the mounting bracket 108. A mounting hole 120 is set on the cleaning bracket 106. The phase change heat storage ball 105 is placed on the mounting hole 120. Multiple phase change heat storage balls 105 can be installed on each cleaning bracket 106. In this way, multiple cleaning brackets 106 can be set to install more phase change heat storage balls 105. A sliding hole 117 is correspondingly arranged on the partition 104, and the cleaning bracket 106 is slidably connected to the slider 119. A cleaning brush assembly is correspondingly arranged at the bottom of the partition 104, so that the driving device can drive the mounting frame 108 to reciprocate up and down to allow the cleaning bracket 106 to slide along the sliding hole 117. At this time, the phase change heat storage ball 105 on the cleaning bracket 106 can contact the cleaning brush assembly, thereby brushing off the scale on the surface of the phase change heat storage ball 105. Each time cleaning is performed, the phase change heat storage ball 105 can be cleaned by reciprocating the mounting frame 108 multiple times. The mounting frame 108 is designed to be a hollow structure, which can reduce the resistance of the mounting frame 108 when it reciprocates up and down in water. The above structure can realize the cleaning of the phase change heat storage ball 105, and the phase change heat storage ball 105 can work stably.

[0031] Furthermore, the cleaning bracket 106 is spiral-shaped, and two slide grooves 118 are symmetrically arranged at the center of the slide hole 117. Slide blocks 119 are arranged on both sides of the cleaning bracket 106. The slide blocks 119 are slidably connected to the corresponding slide grooves 118, and the cleaning bracket 106 is rotatably connected to the mounting frame 108. In this embodiment, the cleaning bracket 106 is set to a spiral structure. When cleaning the phase change heat storage ball 105, since the phase change heat storage ball 105 is placed in the mounting hole 120, the part of the phase change heat storage ball 105 that contacts the cleaning brush assembly is blocked during the up and down movement of the cleaning bracket 106, so that the cleaning is not thorough during cleaning. In order to solve this problem, in this embodiment, the cleaning bracket 106 is set to a spiral structure, and sliders 119 are set on both sides of the cleaning bracket 106. The slider 119 is spherical, and the corresponding slide groove 118 is also arc-shaped. The slider 119 and the slide groove 118 slide in cooperation to play a guiding role, so that when the cleaning bracket 106 moves up and down, the slider 119 slides along the slide groove 118. Since the cleaning bracket 106 is spiral, it will rotate when the cleaning bracket 106 moves up and down, so that the phase change heat storage ball 105 can follow Rotate or produce relative rotation, the phase change heat storage ball 105 can rotate irregularly, in this way, the outer wall of the phase change heat storage ball 105 can be fully in contact with the cleaning brush assembly, so as to clean more thoroughly. Secondly, after the cleaning brush assembly brushes off the scale on the outer wall of the phase change heat storage ball 105, it is easy to adhere to the cleaning brush assembly, which affects the cleaning efficiency. In this embodiment, during the rotation of the cleaning bracket 106, the sliders 119 on both sides of the cleaning bracket 106 can scrape the cleaning brush assembly back and forth, so that the scale on the cleaning brush assembly can be brushed off, and the scale on the cleaning brush assembly can be prevented from sticking to the outer wall of the phase change heat storage ball 105. Designing the cleaning bracket 106 into a spiral structure can not only make the phase change heat storage ball 105 clean more thoroughly, but also clean the scale on the cleaning brush assembly. The cleaning bracket 106 can be connected to the mounting bracket 108 via a universal ball joint.

[0032] Furthermore, limiting brackets are provided on both sides of the cleaning bracket 106 to limit the phase change heat storage ball 105 in the mounting hole 120. The limiting bracket includes a fixing ring 114 and a limiting bar 115. The limiting bar 115 is a hemispherical ring, and its large diameter end is fixed on the fixing ring 114. The fixing ring 114 is fixed on the cleaning bracket 106 on the periphery of the mounting hole 120, and the limiting bar 115 is sleeved on the outside of the phase change heat storage ball 105. Since the phase change heat storage ball 105 needs to be limited in the mounting hole 120 so that the phase change heat storage ball 105 can be driven to move for cleaning by the cleaning bracket 106, in this embodiment, the phase change heat storage ball 105 is limited between the two cleaning brackets 106 by setting limit brackets on both sides of the cleaning bracket 106. The limit bar 115 includes a plurality of warp and weft threads, which are incomplete hemispherical. The fixing ring 114 can be fixed to the limit bracket by bolts or welded to the limit bracket. In addition, the fixing ring 114 can be removed and the limit bar 115 can be directly welded to the limit bracket.

[0033] Furthermore, it also includes a driving device, which includes a driving motor 109 and a screw rod 110. A screw nut 111 is provided on the mounting frame 108. The screw rod 110 is threadedly connected to the screw nut 111. One end of the screw rod 110 is connected to the output end of the driving motor 109, and the other end is rotatably connected to the partition 104. A guide rod is provided in the heat storage tank 102, and the partition 104 is slidably connected to the guide rod. In this embodiment, a driving motor 109 is used to drive the mounting frame 108 to move up and down. The screw rod 110 is a stainless steel screw rod 110 and is rust-proofed. The screw nut 111 is fixed to the middle part of the mounting frame 108. Four guide rods are axially arranged in the heat storage tank 102. One end of the guide rod can be connected to the partition 104, and the other end is connected to the top of the heat storage 1, which plays a guiding role. The mounting frame 108 is driven to move up and down by the forward and reverse motion of the driving motor 109.

[0034] Furthermore, a plurality of fixing bars 1053 are provided in the shell 1051, and fins 1054 are provided on the fixing bars 1053. In this embodiment, the shell 1051 is a metal shell 1051, which is a spherical structure formed by two semicircular shells 1051 connected by threads or welding, and a plurality of fixing bars 1053 are provided in the shell 1051, and the fixing bars 1053 are metal bars, and the fins 1054 are welded on the fixing bars 1053. By providing the fins 1054, heat can be more easily transferred to the interior of the phase change heat storage ball 105, which is convenient for rapid heat absorption and rapid heat release.

[0035] Furthermore, the cleaning brush assembly includes a fixed cylinder 107 and bristles, the bristles are fixed to the inner wall of the fixed cylinder 107, the fixed cylinder 107 is coaxially arranged with the sliding hole 117, and the fixed cylinder 107 is fixed to the partition 104. In this embodiment, bristles are arranged in the fixed cylinder 107, and the bristles are metal bristles. The fixed cylinder 107 is fixed to the bottom of the partition 104 by bolts. When cleaning, the cleaning bracket 106 moves up and down in the fixed cylinder 107, and the phase change heat storage ball 105 is brushed by the bristles.

[0036] An exhaust valve 112 is also provided at the top of the heat storage tank 1 for discharging the high-pressure gas inside the heat storage tank 1 , and a sewage outlet 113 is also provided at the lower end of the heat storage tank 1 .

[0037] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the above-mentioned technical content without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any changes, modifications, equivalent changes and modifications made to the above embodiments based on the technology of the present invention without departing from the content of the technical solution of the present invention belong to the protection scope of the present technical solution.

Claims

1. A phase change-water combined heat storage device based on solar heat collection coupling, characterized in that: The invention comprises a solar thermal collector (2) and a heat storage device (1), wherein the heat storage device (1) comprises a heat storage device outer tank (101), a heat storage device inner tank (102), a partition (104) and a phase-change heat storage ball (105); the heat storage device inner tank (102) is sleeved in the heat storage device outer tank (101); the partition (104) is horizontally arranged in the heat storage device inner tank (102) to separate the water storage chamber of the heat storage device inner tank (102) into a high-temperature zone and a low-temperature zone; the partition (104) is provided with a water hole (116); a plurality of phase-change heat storage balls (105) are placed in the high-temperature zone; the heat storage device (1) is located in the high-temperature zone and is connected to the water outlet of the solar thermal collector (2) through a water inlet pipe; and the low-temperature zone of the heat storage device (1) is connected to the water inlet of the solar thermal collector (2) through a water outlet pipe; A cleaning mechanism is arranged in the heat storage tank (102), and the cleaning mechanism comprises a cleaning bracket (106) and a mounting bracket (108). A plurality of the cleaning brackets (106) are arranged on the mounting bracket (108). A plurality of mounting holes (120) are arranged in an array along the length direction of the cleaning bracket (106). The phase change heat storage balls (105) are arranged in the mounting holes (120) in a one-to-one correspondence. A sliding hole (117) is arranged on the partition (104). The cleaning bracket (106) is slidably connected to the sliding hole (117). A cleaning brush assembly is arranged at the bottom of the partition (104), and the cleaning brush assembly is arranged around the sliding hole (117).

2. According to claim 1, a phase change-water combined heat storage device based on solar thermal collection coupling is characterized in that: A heat-insulating layer (103) is provided between the heat storage outer tank (101) and the heat storage inner tank (102).

3. The phase change-water combined heat storage device based on solar thermal collection coupling according to claim 1 is characterized in that: The phase-change heat storage ball (105) comprises a shell (1051) and a phase-change filler (1052) filled inside the shell (1051).

4. The phase change-water combined heat storage device based on solar thermal collection coupling according to claim 3 is characterized in that: The phase change filler (1052) comprises paraffin wax and graphite powder, and the composition ratio of the paraffin wax to the graphite powder is 9:

1.

5. The phase change-water combined heat storage device based on solar thermal collection coupling according to claim 1 is characterized in that: The cleaning bracket (106) is spiral-shaped, and two sliding grooves (118) are symmetrically arranged on the side wall of the sliding hole (117). Slide blocks (119) are arranged on both sides of the cleaning bracket (106), and the slide blocks (119) are slidably connected to the corresponding sliding grooves (118). The cleaning bracket (106) is rotatably connected to the mounting frame (108).

6. The phase change-water combined heat storage device based on solar thermal collection coupling according to claim 5 is characterized in that: Limiting brackets are arranged on both sides of the cleaning bracket (106) to limit the phase change heat storage ball (105) in the mounting hole (120), and the limiting bracket comprises a fixing ring (114) and a limiting fence (115). The limiting fence (115) is a hemispherical ring, and its large diameter end is fixed to the fixing ring (114). The fixing ring (114) is fixed to the cleaning bracket (106) at the periphery of the mounting hole (120), and the limiting fence (115) is sleeved on the outside of the phase change heat storage ball (105).

7. The phase change-water combined heat storage device based on solar thermal collection coupling according to claim 5 is characterized in that: The heat storage device further comprises a driving device, the driving device comprising a driving motor (109) and a screw rod (110), a screw rod nut (111) being provided on the mounting frame (108), the screw rod (110) being threadedly connected to the screw rod nut (111), one end of the screw rod (110) being connected to the output end of the driving motor (109), and the other end being rotatably connected to the partition (104), a guide rod being provided in the heat storage tank (102), and the partition (104) being slidably connected to the guide rod.

8. The phase change-water combined heat storage device based on solar thermal collection coupling according to claim 3 is characterized in that: A plurality of fixing bars (1053) are arranged in the shell (1051), and fins (1054) are arranged on the fixing bars (1053).

9. The phase change-water combined heat storage device based on solar thermal collection coupling according to claim 5 is characterized in that: The cleaning brush assembly comprises a fixed cylinder (107) and bristles, wherein the bristles are fixed to the inner wall of the fixed cylinder (107), the fixed cylinder (107) is coaxially arranged with the sliding hole (117), and the fixed cylinder (107) is fixed to the partition (104).

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