Rotary powder disperser

Abstract

The invention discloses a rotary powder disperser which comprises a shell, a rotary assembly rotationally mounted in the shell through a bearing, and a gas driving device mounted in the shell and used for driving the rotary assembly to rotate, and is characterized in that a first gap is formed between the rotary assembly and the shell and used for exhausting of the gas driving device; the rotary powder disperser is further provided with a first sealing structure, when the gas driving device drives the rotary assembly to rotate, the first sealing structure can open the first gap, and when the gas driving device stops driving the rotary assembly to rotate, the first sealing structure can seal the first gap. According to the rotary powder distributor, the situation that powder, dust and the like enter the bearing from the first gap can be effectively prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of powder spraying, in particular to a rotary powder disperser. Background Art

[0002] The rotating powder spreader of an existing powder spray gun uses a pneumatic turbine to drive the rotating assembly. When the turbine-driven airflow is present, the turbine-driven airflow is discharged through the gap between the rotating assembly and the outer shell, preventing external powder from entering the bearings and pneumatic turbine on which the rotating assembly is mounted. However, when the driving airflow is interrupted, there is a problem of seal failure, resulting in powder intrusion into the bearings and pneumatic turbine. Especially in electrostatic spraying scenarios, powder intrusion into the bearings can cause the rotating assembly to jam, seriously affecting the life of the equipment. In particular, powder spraying requires frequent changes in different colors or types of powder for spraying. During this change, the turbine-driven airflow is interrupted. When changing powder, workers need to use a compressed air gun to blow away any remaining powder from the rotating assembly. Under the action of the high-speed cleaning airflow, external powder can easily be blown into the gap between the rotating assembly and the outer shell by the cleaning airflow, causing the rotating assembly to jam and thus preventing the rotating assembly from reaching the set speed value. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a rotating powder spreader that can effectively prevent powder, dust, etc. from entering a first gap between a rotating assembly and a housing, thereby affecting the operation of the rotating powder spreader.

[0004] According to an embodiment of the present invention, a rotary powder spreader includes a housing, a rotary assembly rotatably mounted within the housing, and an air drive device mounted within the housing for driving the rotary assembly to rotate. A first gap is defined between the rotary assembly and the housing, and the first gap is used for exhausting the air drive device. The rotary powder spreader is further provided with a first sealing structure. When the air drive device drives the rotary assembly to rotate, the first sealing structure is capable of opening the first gap. When the air drive device stops driving the rotary assembly to rotate, the first sealing structure is capable of sealing the first gap.

[0005] The rotary powder disperser according to the embodiment of the present invention has at least the following beneficial effects: in the rotary powder disperser provided by the present invention, when the air drive device drives the rotary component to rotate, the driving airflow discharged by the air drive device can be discharged from the first gap, thereby forming a sealing effect in the first gap by utilizing the driving airflow; and when the air drive device stops working, resulting in interruption of the driving airflow in the first gap but the first gap still needs to be sealed, for example, when the rotary powder disperser needs to replace the powder, the first gap can be sealed by the first sealing structure. Through the above arrangement, it is possible to effectively prevent powder, dust, etc. from entering the first gap between the rotary component and the housing, thereby affecting the operation of the rotary powder disperser.

[0006] According to some embodiments of the present invention, the first sealing structure is configured as a movable sealing structure, and at least a portion of the first sealing structure is movable to open or seal the first gap; or, the first sealing structure is configured as an airbag sealing structure, and the first sealing structure can be inflated and deflated to seal or open the first gap.

[0007] According to some embodiments of the present invention, the rotating component can be slidably installed on the housing, the rotating component can move along the rotation axis of the rotating component, and the first sealing structure is configured as a movable sealing structure, and the first sealing structure is configured between the rotating component and the housing.

[0008] According to some embodiments of the present invention, a reset structure is provided between the rotating assembly and the housing, and the reset structure is used to drive the rotating assembly to move to a first position in which the first sealing structure closes the first gap, wherein the rotating assembly can be pushed to a second position by at least one of the airflow supplied by an air supply channel or the driving airflow discharged by the air drive device, so that the first sealing structure opens the first gap; the first sealing structure includes a first annular sealing portion and a first annular avoidance groove, one of the first sealing portion and the first avoidance groove is provided on the inner wall of the housing, and the other is provided on the outer wall of the rotating assembly, and the rotating assembly moves When the cam moves to the second position, the first sealing portion moves to the first avoidance groove. When the rotating assembly moves to the first position, the first sealing portion abuts and seals against a side wall of the first avoidance groove. The first sealing structure includes a first sealing ring and a first sealing surface relatively arranged along the rotation axis of the rotating assembly. The first sealing ring is at least partially located in the first gap. The first sealing ring is located on the side of the bearing away from the air drive device. One of the first sealing ring and the first sealing surface is provided on the rotating assembly and the other is provided on the housing. When the rotating assembly moves to the first position, the first sealing ring abuts and seals against the first sealing surface.

[0009] According to some embodiments of the present invention, the rotary powder spreader includes an inner spreading member mounted on the inner side of the rotary assembly, the rotary assembly and the inner spreading member enclosing a second gap. The rotary powder spreader is further configured with a second sealing structure. When the pneumatic drive device drives the rotary assembly to rotate, the second sealing structure is capable of opening the second gap. When the pneumatic drive device stops driving the rotary assembly to rotate, the second sealing structure is capable of sealing the second gap.

[0010] According to some embodiments of the present invention, the second sealing structure is configured as a movable sealing structure, and at least part of the second sealing structure is movable to open or seal the second gap; or, the second sealing structure is configured as an airbag sealing structure, and the second sealing structure can be inflated and deflated to seal or open the second gap.

[0011] According to some embodiments of the present invention, the rotating assembly is slidably mounted on the outer shell, the rotating assembly is movable along the rotation axis of the rotating assembly, the second sealing structure is configured as a movable sealing structure, and the second sealing structure is disposed between the rotating assembly and the inner diffuser.

[0012] According to some embodiments of the present invention, a reset structure is provided between the rotating assembly and the housing, the reset structure being used to drive the rotating assembly to move to a first position, wherein the rotating assembly can be pushed to a second position by at least one of an airflow supplied by an air supply channel or a driving airflow discharged by the air drive device, so that the second sealing structure opens the second gap; the second sealing structure comprises an annular second sealing portion and an annular second avoidance groove, one of the second sealing portion and the second avoidance groove being provided on an inner wall of the rotating assembly, and the other being provided on an outer wall of the inner diffuser, wherein when the rotating assembly moves to the second position, the second sealing portion moves to the second avoidance groove, and when the rotating assembly moves to the first position, the second sealing portion abuts and seals against a side wall of the second avoidance groove; the second sealing structure comprises a second sealing ring and a second sealing surface arranged opposite to each other along the rotation axis of the rotating assembly, one of the second sealing ring and the second sealing surface being provided on the air drive device, and the other being provided on the rotating assembly, wherein when the rotating assembly moves to the first position, the second sealing ring abuts and seals against the second sealing surface, and when the rotating assembly moves to the second position, the gap between the second sealing ring and the second sealing surface communicates with the second gap.

[0013] According to some embodiments of the present invention, the rotating assembly is mounted to the housing via a bearing, and the first sealing structure is at least partially located on a side of the bearing facing away from the air drive device.

[0014] According to some embodiments of the present invention, the air drive device supplies air through an air supply channel, and the air supply channel is equipped with a filter plate for filtering the airflow; the end of the shell facing away from the rotating assembly has a connecting end, and the connecting end is used to connect to the gun barrel of the spray gun, wherein the air supply channel inputs airflow from the gun barrel, or the shell is provided with an air supply interface for communicating with the air supply channel; the driving structure between the air drive device and the rotating assembly is configured as a pneumatic turbine; a powder spreading channel is formed between the rotating assembly and the inner spreading member, and a powder input channel is provided inside the inner spreading member or between the inner spreading member and the shell, and the powder input channel is communicated with the powder spreading channel, and the powder spreading channel is located on a side of the second gap facing away from the air drive device and is communicated with the second gap; a discharge structure is provided at one end of the inner spreading member facing away from the air drive device, and the discharge structure is located at the center of the powder spreading channel; at least one of the shell, the rotating assembly, and the air drive device is made of non-metallic material.

[0015] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0017] Figure 1 Schematic diagram of a half-section of a rotating powder spreader (when the first sealing structure seals the first gap) according to an embodiment of the present invention;

[0018] Figure 2 for Figure 1 An enlarged view of the rotating powder spreader at A is shown;

[0019] Figure 3 for Figure 1 An enlarged view of the rotating powder spreader at B is shown;

[0020] Figure 4 A cross-sectional view of a rotating powder spreader according to an embodiment of the present invention (when the first sealing structure opens the first gap);

[0021] Figure 5 for Figure 4 An enlarged view of the rotating powder spreader at C is shown;

[0022] Figure 6 for Figure 4 An enlarged view of the rotating powder spreader at D is shown;

[0023] Figure 7 for Figure 1 A cross-sectional view of the rotating assembly of a rotating powder spreader is shown.

[0024] Reference numerals:

[0025] Housing 100, first avoidance groove 110, connecting end 120, sliding seat 130, bearing 200, air drive device 300, filter plate 310, rotating assembly 400, outer spreading member 400a, rotating shaft 400b, rotating wheel 400c, first sealing portion 410, second avoidance groove 420, first sealing surface 430, second sealing surface 440, stirring protrusion 450, inner spreading member 500, second sealing portion 510, discharge structure 520, air supply channel 530, reset structure 600, powder spreading channel 710, powder input channel 720, first gap 730, second gap 740, first sealing ring 810, second sealing ring 820. DETAILED DESCRIPTION

[0026] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0027] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0028] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0029] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0030] Reference Figure 1 、 Figure 2 、 Figure 4 and Figure 5According to an embodiment of the present invention, a rotary powder disperser includes a housing 100, a rotary assembly 400 rotatably mounted inside the housing 100, and an air drive device 300 mounted inside the housing 100 for driving the rotary assembly 400 to rotate. A first gap 730 is defined between the rotary assembly 400 and the housing 100. The first gap 730 is used for exhausting the air drive device 300. The rotary powder disperser is further provided with a first sealing structure. When the air drive device 300 drives the rotary assembly 400 to rotate, the first sealing structure can open the first gap 730. When the air drive device 300 stops driving the rotary assembly 400 to rotate, the first sealing structure can seal the first gap 730.

[0031] During the specific implementation process, the rotating assembly 400 can be installed on the housing 100 through the bearing 200 to make the rotating assembly 400 rotate more flexibly, wherein the first sealing structure is at least partially located on the side of the bearing 200 away from the air drive device 300, thereby preventing powder, dust, etc. from entering the first gap 730 and then contacting the bearing 200.

[0032] In the rotary powder spreader provided by the present invention, when the air drive device 300 drives the rotating assembly 400 to rotate, the driving airflow discharged by the air drive device 300 can be discharged from the first gap 730, thereby forming a sealing effect in the first gap 730 using the driving airflow. When the air drive device 300 stops working, resulting in interruption of the driving airflow in the first gap 730, but the first gap 730 still needs to be sealed, for example, when the rotary powder spreader needs to replace the powder, the first gap 730 can be sealed by the first sealing structure. In this way, powder, dust, etc. can be effectively prevented from entering the first gap 730 between the rotating assembly 400 and the housing 100, thereby affecting the operation of the rotary powder spreader.

[0033] Reference Figure 1 、 Figure 2 、 Figure 4 and Figure 5 According to some embodiments of the present invention, the first sealing structure is configured as a movable sealing structure, and at least a portion of the first sealing structure is movable to open or seal the first gap 730. By moving at least a portion of the first sealing structure, the first sealing structure can switch between a state of opening the first gap 730 and a state of sealing the first gap 730, thereby meeting working requirements.

[0034] Reference Figure 1 、 Figure 2 、 Figure 4 and Figure 5Specifically, according to some embodiments of the present invention, the rotating assembly 400 is slidably mounted on the housing 100. The rotating assembly 400 is movable along the rotation axis 400b of the rotating assembly 400, and the first sealing structure is disposed between the rotating assembly 400 and the housing 100. With this arrangement, the first sealing structure is a movable sealing structure disposed between the rotating assembly 400 and the housing 100. Thus, when the rotating assembly 400 moves, it can drive at least a portion of the first sealing structure to move, thereby enabling the first sealing structure to open or seal the first gap 730.

[0035] A reset structure 600 is provided between the rotating assembly 400 and the housing 100. The reset structure 600 is used to drive the rotating assembly 400 to move to the first position in which the first sealing structure closes the first gap 730. The air drive device 300 supplies air through the air supply channel 530, and the air supply channel 530 simultaneously branches off a branch channel to supply air to the rotating assembly 400. As a result, the rotating assembly 400 can be pushed to the second position by the air flow supplied by the air supply channel 530, so that the first sealing structure opens the first gap 730. It should be noted that in other embodiments, the rotating assembly 400 can also be directly pushed to the second position by the driving air flow discharged from the air drive device 300. In this case, the air supply channel 530 does not need to branch off a branch channel to supply air to the rotating assembly 400.

[0036] Of course, in other embodiments, the rotating assembly 400 may also be directly pushed to the first position or the second position by a pusher, and in this case, the reset structure 600 may not be provided.

[0037] Reference Figure 1 and Figure 7 According to some embodiments of the present invention, an annular sliding seat 130 is slidably mounted within the housing 100. The rotating assembly 400 is rotatably mounted within the sliding seat 130 via a bearing 200. A reset structure 600 is disposed between the sliding seat 130 and the housing 100. Due to the provision of the sliding seat 130, the rotating assembly 400 and the bearing 200 can synchronously slide relative to the housing 100 along the axis 400b of the rotating assembly 400. As a result, the rotating assembly 400 and the bearing 200 are relatively fixed, and the bearing 200 is separated from the housing 100, preventing wear on the bearing 200 caused by movement of the rotating assembly 400.

[0038] Reference Figure 1 、 Figure 2 、 Figure 4 and Figure 5According to some embodiments of the present invention, the first sealing structure includes an annular first sealing portion 410 and an annular first avoidance groove 110. One of the first sealing portion 410 and the first avoidance groove 110 is disposed on the inner wall of the housing 100, and the other is disposed on the outer wall of the rotating assembly 400. When the rotating assembly 400 moves to the second position, the first sealing portion 410 moves to the first avoidance groove 110. When the rotating assembly 400 moves to the first position, the first sealing portion 410 abuts and seals against a sidewall of the first avoidance groove 110. Thus, the rotating assembly 400 can drive the first sealing portion 410 or the first avoidance groove 110 to move, so that the first sealing structure opens or seals the first gap 730 through the cooperation between the first sealing portion 410 and the first avoidance groove 110.

[0039] In a specific implementation process, the first sealing portion 410 and the first avoidance groove 110 can be provided in one group, two groups or more to improve the sealing performance.

[0040] Reference Figure 1 、 Figure 2 、 Figure 4 and Figure 5 According to some embodiments of the present invention, the first sealing structure may further include a first sealing ring 810 and a first sealing surface 430 disposed opposite each other along the axis 400b of the rotating assembly 400. The first sealing ring 810 is at least partially located within the first gap 730. The first sealing ring 810 is located on the side of the bearing 200 facing away from the air drive device 300. One of the first sealing ring 810 and the first sealing surface 430 is disposed on the rotating assembly 400, and the other is disposed on the housing 100. When the rotating assembly 400 moves to the first position, the first sealing ring 810 and the first sealing surface 430 abut and seal. Thus, the rotating assembly 400 can drive the first sealing ring 810 or the first sealing surface 430 to move, thereby enabling the first sealing structure to open or seal the first gap 730 through the cooperation between the first sealing ring 810 and the first sealing surface 430. In specific implementations, one, two, or more first sealing rings 810 may be provided to improve sealing performance.

[0041] Using the above-mentioned setting method, the first sealing part 410 cooperates with the first avoidance groove 110 to form a first movable sealing structure, and the first sealing ring 810 cooperates with the first sealing surface 430 to form a second movable sealing structure. Through two different movable sealing structures, the sealing performance can be effectively improved, thereby more effectively preventing powder, dust, etc. from entering the bearing 200 from the first gap 730.

[0042] It should be noted that the above-mentioned movable sealing structure can also be set up in other ways. For example, the movable sealing structure includes an annular sealing ring and a linear pusher. The first gap 730 is connected to an annular active space. The annular sealing ring is arranged in the active space. The linear pusher is connected to the annular sealing ring. The linear pusher can push the annular sealing ring to slide along the rotating shaft 400b of the rotating component 400, so that the annular sealing ring is stuck in the connection between the first gap 730 and the active space, thereby sealing the first gap 730.

[0043] According to other embodiments of the present invention, the first sealing structure may also be configured as an airbag-type sealing structure, which can be inflated and deflated to seal or open the first gap 730. Specifically, the first sealing structure includes at least one annular elastic airbag, which is hollow inside and further configured with an inflation channel and a control valve. The control valve is used to control the on / off of the inflation channel. The elastic airbag is connected to an air source such as an air pump or an air tank through the inflation channel. When the elastic airbag needs to be inflated, the control valve opens. After the elastic airbag expands and seals the first gap 730, the control valve closes to maintain the sealed state. When the elastic airbag needs to be deflated, the control valve opens to allow the elastic airbag to deflate through the inflation channel, thereby opening the first gap 730.

[0044] Reference Figure 1 、 Figure 3 、 Figure 4 and Figure 6 According to some embodiments of the present invention, the rotating powder spreader further includes an inner spreading member 500 mounted on the inner side of the rotating assembly 400, and a powder spreading channel 710 is formed between the rotating assembly 400 and the inner spreading member 500. A powder input channel 720 is provided inside the inner spreading member 500 or between the inner spreading member 500 and the outer shell 100, and the powder input channel 720 is communicated with the powder spreading channel 710. The rotating assembly 400 and the inner spreading member 500 are enclosed to form a second gap 740, and the powder spreading channel 710 is located on a side of the second gap 740 away from the air drive device 300 and is communicated with the second gap 740. The rotating powder spreader is further provided with a second sealing structure. When the air drive device 300 drives the rotating assembly 400 to rotate, the second sealing structure can open the second gap 740. When the air drive device 300 stops driving the rotating assembly 400 to rotate, the second sealing structure can seal the second gap 740. With the above arrangement, when the air drive device 300 stops working and the driving airflow in the second gap 740 is interrupted, but the second gap 740 still needs to be sealed, for example, when the rotary powder spreader needs to replace the powder, the second gap 740 can be sealed by the second sealing structure. With the above arrangement, powder, dust, etc. can be effectively prevented from entering the air drive device 300 through the second gap 740.

[0045] Reference Figure 1 、 Figure 4 The first gap 730 and the second gap 740 are connected via the gap between the air drive device 300 and the rotating assembly 400. The driving airflow discharged from the air drive device 300 can be discharged through the gap between the air drive device 300 and the rotating assembly 400 from the first gap 730 and the second gap 740, thereby sealing the first gap 730 and the second gap 740. Furthermore, the driving airflow discharged from the first gap 730 can cause the rotating assembly 400 to levitate relative to the housing 100, reducing rotational friction and wear between the rotating assembly 400 and the housing 100. The driving airflow discharged from the second gap 740 can cause the rotating assembly 400 to levitate relative to the inner diffuser 500, reducing rotational friction and wear between the rotating assembly 400 and the inner diffuser 500. This achieves air suspension of the rotating assembly 400, enabling high-speed, stable rotation of the rotating assembly 400, reducing noise, and ensuring the service life of the rotating assembly 400. Secondly, the driving airflow discharged from the second gap 740 enters the powder dispersing channel 710 and then is discharged. The driving airflow discharged from the second gap 740 can be used to increase the speed of powder spraying.

[0046] When the rotary powder spreader performs powder spraying, the air drive device 300 can drive the rotary assembly 400 to rotate, and the powder can be input from the powder input channel 720 to the powder spreading channel 710, and then the powder is rotated and sprayed out under the drive of the rotary assembly 400.

[0047] Reference Figure 7 According to some embodiments of the present invention, the rotating component 400 is provided with a stirring protrusion 450, and the stirring protrusion 450 is located in the powder spreading channel 710. Thus, when the rotating powder spreader performs powder spraying, the sprayed powder can be stirred by the stirring protrusion 450, so that the powder can be sprayed more evenly, thereby improving the spraying quality of the rotating powder spreader.

[0048] Reference Figure 1 、 Figure 3 、 Figure 4 and Figure 6 According to some embodiments of the present invention, the second sealing structure is configured as a movable sealing structure, and at least a portion of the second sealing structure is movable to open or seal the second gap 740. By moving at least a portion of the second sealing structure, the second sealing structure can be switched between a state of opening the second gap 740 and a state of sealing the second gap 740, thereby meeting working requirements.

[0049] Reference Figure 1 、 Figure 3 、 Figure 4 and Figure 6According to some embodiments of the present invention, the rotating assembly 400 can be slidably installed on the housing 100, and the rotating assembly 400 can move along the rotation axis of the rotating assembly 400. The second sealing structure is configured as a movable sealing structure, and the second sealing structure is disposed between the rotating assembly 400 and the inner distributing member 500. Thus, the movement of the rotating assembly 400 can drive at least partial movement of the second sealing structure, thereby enabling the second sealing structure to switch between a state of opening the second gap 740 and a state of sealing the second gap 740, thereby meeting working requirements.

[0050] Reference Figure 1 、 Figure 3 、 Figure 4 and Figure 6 According to some embodiments of the present invention, a reset structure 600 is provided between the rotating assembly 400 and the housing 100, and the reset structure 600 is used to drive the rotating assembly 400 to move to the first position, wherein the air drive device 300 supplies air through the air supply channel 530, and the rotating assembly 400 can be pushed to the second position by the air flow supplied by the air supply channel 530 or the driving air flow discharged by the air drive device 300.

[0051] Reference Figure 1 、 Figure 3 、 Figure 4 and Figure 6 According to some embodiments of the present invention, the second sealing structure includes an annular second sealing portion 510 and an annular second escape groove 420. One of the second sealing portion 510 and the second escape groove 420 is disposed on the inner wall of the rotating assembly 400, and the other is disposed on the outer wall of the inner spreading member 500. When the rotating assembly 400 moves to the second position, the second sealing portion 510 moves to the second escape groove 420. When the rotating assembly 400 moves to the first position, the second sealing portion 510 abuts and seals against a sidewall of the second escape groove 420. Thus, the rotating assembly 400 can drive the second sealing portion 510 or the second escape groove 420 to move, thereby enabling the second sealing structure to open or seal the second gap 740 through the cooperation between the second sealing portion 510 and the second escape groove 420.

[0052] In a specific implementation process, the second sealing portion 510 and the second avoidance groove 420 can be provided in one group, two groups or more to improve the sealing performance.

[0053] Reference Figure 1 、 Figure 3 、 Figure 4 and Figure 6According to some embodiments of the present invention, the second sealing structure may further include a second sealing ring 820 and a second sealing surface 440 disposed opposite each other along the axis 400b of the rotating assembly 400. One of the second sealing ring 820 and the second sealing surface 440 is disposed on the air drive device 300, and the other is disposed on the rotating assembly 400. When the rotating assembly 400 moves to the first position, the second sealing ring 820 and the second sealing surface 440 abut and seal. When the rotating assembly 400 moves to the second position, the gap between the second sealing ring 820 and the second sealing surface 440 communicates with the second gap 740. Thus, the rotating assembly 400 can drive the second sealing ring 820 or the second sealing surface 440 to move, thereby enabling the second sealing structure to open or seal the second gap 740 through the cooperation between the second sealing ring 820 and the second sealing surface 440. In specific implementations, one, two, or more second sealing rings 820 may be provided to improve sealing performance.

[0054] With the above-mentioned arrangement, the second sealing portion 510 cooperates with the second avoidance groove 420 to form a first movable sealing structure, and the second sealing ring 820 cooperates with the second sealing surface 440 to form a second movable sealing structure. Through two different movable sealing structures, the sealing performance can be effectively improved, thereby more effectively preventing powder, dust, etc. from entering the air drive device 300 from the second gap 740.

[0055] It is contemplated that in other embodiments, the second sealing structure may be configured as an airbag-type sealing structure that can be inflated or deflated to seal or open the second gap 740. Specifically, the second sealing structure includes at least one elastic airbag disposed within the inner diffuser 500. The elastic airbag is inflated or deflated via an inflation channel provided on the inner diffuser 500, thereby expanding or contracting the elastic airbag to seal or open the second gap 740.

[0056] Reference Figure 1 、 Figure 4 and Figure 6 According to some embodiments of the present invention, the inner wall of the rotating assembly 400 near the end of the gas drive device 300 is arranged to be zigzag, or the outer wall of the inner distributing member 500 near the end of the gas drive device 300 is arranged to be zigzag, so that the second gap 740 near the end of the gas drive device 300 forms a labyrinth seal structure.

[0057] Reference Figure 1 According to some embodiments of the present invention, the air supply channel 530 is provided with a filter plate 310 for filtering the airflow. The filter plate 310 filters the driving airflow input to the pneumatic device to prevent the input driving airflow from carrying dust or other impurities.

[0058] Reference Figure 1 and Figure 4 According to some embodiments of the present invention, the housing 100 has a connecting end 120 at one end away from the rotating assembly 400. The connecting end 120 is used to connect to the barrel of the spray gun. Through the setting of the connecting end 120, the rotating powder spreader can be easily installed on the barrel of the spray gun.

[0059] Reference Figure 1 and Figure 4 In some embodiments, the air supply channel 530 can be fed with air from the barrel of the spray gun. Specifically, the connection end 120 is annular. When the spray gun barrel is inserted into the connection end 120, the air source channel within the barrel connects with the air supply channel 530, thereby enabling air flow from the spray gun barrel to the air supply channel 530. The air source channel within the barrel can be fed with pre-charge air or another air source. Pre-charge air is typically used to drive powder flow in a spray gun.

[0060] Of course, in other embodiments, the housing 100 may also be provided with an air supply interface for communicating with the air supply channel 530 , and the air supply interface is used to connect to an external air source to supply air to the air drive device 300 .

[0061] According to some embodiments of the present invention, the driving structure between the air drive device 300 and the rotating assembly 400 is configured as an air turbine.

[0062] Reference Figure 1 、 Figure 4 and Figure 7 Specifically, the air drive device 300 includes an air supply wheel, and the rotating assembly 400 includes an outer spreading member 400a and a rotating shaft 400b. The outer spreading member 400a is mounted on one end of the rotating shaft 400b, and the other end of the rotating shaft 400b is connected to a rotating wheel 400c. The rotating shaft 400b is mounted on the inner spreading member 500. The powder distribution channel 710 is formed by the outer spreading member 400a and the inner spreading member 500. The driving airflow discharged by the air supply wheel acts on the vortex on the rotating wheel 400c to drive the rotating wheel 400c to rotate. As a result, the rotating wheel 400c and the air supply wheel form an air turbine.

[0063] The rotating shaft 400b and the rotating wheel 400c can be integrally formed to reduce assembly steps and facilitate installation. In addition, the rotating shaft 400b can be assembled with outer spreading members 400a of different shapes to form different types of rotating assemblies 400, thereby reducing production costs.

[0064] Of course, in other embodiments, the rotating wheel 400c can be set as an independent component relative to the rotating assembly 400, and then the rotating wheel 400c and the rotating assembly 400 are fixedly connected by bolts, snaps, welding, etc.

[0065] It should be noted that the driving structure between the air drive device 300 and the rotating assembly 400 can also be arranged in other ways. For example, the above-mentioned rotating wheel 400c can be replaced by a turbofan having vortex blades distributed in a circular pattern.

[0066] Reference Figure 1 According to some embodiments of the present invention, a discharge structure 520 is provided at the end of the inner spreading member 500 facing away from the air drive device 300. Discharge structure 520 is located at the center of the powder spreading passage 710 to facilitate electrostatic powder spraying. Discharge structure 520 can be configured as a single-pointed discharge needle, a multi-pointed discharge needle assembly, or a disc-shaped discharge needle assembly. Discharge structure 520 is located at the center of the powder dispersion spray.

[0067] According to some embodiments of the present invention, at least one of the housing 100, the rotating assembly 400, or the pneumatic drive 300 is constructed from a non-metallic material, such as plastic or ceramic, to ensure insulation and reduce production costs. In practice, the non-metallic material can comprise at least 90% of the total weight of the rotating powder spreader.

[0068] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the technical field without departing from the scope of the present invention.

Claims

1. A rotary powder spreader comprising a housing (100), a rotary assembly (400) rotatably mounted inside the housing (100), and an air drive device (300) mounted inside the housing (100) for driving the rotary assembly (400) to rotate, characterized in that: A first gap (730) is provided between the rotating assembly (400) and the housing (100), and the first gap (730) is used for exhausting the air drive device (300). The rotating powder spreader is further provided with a first sealing structure. When the air drive device (300) drives the rotating assembly (400) to rotate, the first sealing structure can open the first gap (730). When the air drive device (300) stops driving the rotating assembly (400) to rotate, the first sealing structure can seal the first gap (730).

2. A rotary powder spreader according to claim 1, characterized in that: The first sealing structure is configured as a movable sealing structure, and at least a portion of the first sealing structure is movable to open or seal the first gap (730); Alternatively, the first sealing structure is configured as an airbag sealing structure, and the first sealing structure can be inflated or deflated to seal or open the first gap (730).

3. A rotary powder spreader according to claim 2, characterized in that: The rotating assembly (400) is slidably mounted on the housing (100), and the rotating assembly (400) is movable along the rotation axis of the rotating assembly (400). The first sealing structure is configured as a movable sealing structure, and the first sealing structure is disposed between the rotating assembly (400) and the housing (100).

4. A rotary powder spreader according to claim 3, characterized in that: A reset structure (600) is provided between the rotating assembly (400) and the housing (100), and the reset structure (600) is used to drive the rotating assembly (400) to move to a first position in which the first sealing structure closes the first gap (730), wherein the rotating assembly (400) can be pushed to a second position by at least one of an air flow supplied by an air supply channel (530) or a driving air flow discharged by the air drive device (300), so that the first sealing structure opens the first gap (730); The first sealing structure comprises an annular first sealing portion (410) and an annular first avoidance groove (110); one of the first sealing portion (410) and the first avoidance groove (110) is arranged on the inner wall of the housing (100), and the other is arranged on the outer wall of the rotating component (400); when the rotating component (400) moves to the second position, the first sealing portion (410) moves to the first avoidance groove (110); when the rotating component (400) moves to the first position, the first sealing portion (410) abuts against a side wall of the first avoidance groove (110) for sealing; The first sealing structure comprises a first sealing ring (810) and a first sealing surface (430) arranged opposite to each other along the rotation axis of the rotating assembly (400); the first sealing ring (810) is at least partially located in the first gap (730); the first sealing ring (810) is located on a side of the bearing (200) facing away from the air drive device (300); one of the first sealing ring (810) and the first sealing surface (430) is arranged on the rotating assembly (400) and the other is arranged on the housing (100); when the rotating assembly (400) moves to the first position, the first sealing ring (810) and the first sealing surface (430) abut and seal.

5. A rotary powder spreader according to claim 1, characterized in that: The rotary powder spreader comprises an inner spreading member (500) installed inside the rotating assembly (400), wherein the rotating assembly (400) and the inner spreading member (500) enclose a second gap (740), and the rotary powder spreader is further provided with a second sealing structure. When the air driving device (300) drives the rotating assembly (400) to rotate, the second sealing structure can open the second gap (740), and when the air driving device (300) stops driving the rotating assembly (400) to rotate, the second sealing structure can seal the second gap (740).

6. A rotary powder spreader according to claim 5, characterized in that: The second sealing structure is configured as a movable sealing structure, at least a portion of which is movable to open or seal the second gap (740); or, The second sealing structure is configured as an airbag sealing structure, and the second sealing structure can be inflated or deflated to seal or open the second gap (740).

7. A rotary powder spreader according to claim 6, characterized in that: The rotating assembly (400) is slidably mounted on the housing (100), and the rotating assembly (400) is movable along the rotation axis of the rotating assembly (400). The second sealing structure is configured as a movable sealing structure, and the second sealing structure is disposed between the rotating assembly (400) and the inner distributing member (500).

8. A rotary powder spreader according to claim 7, characterized in that: A reset structure (600) is provided between the rotating assembly (400) and the housing (100), and the reset structure (600) is used to drive the rotating assembly (400) to move to a first position, and the rotating assembly (400) can be pushed to a second position by at least one of the airflow supplied by an air supply channel (530) or the driving airflow discharged by the air drive device (300), so that the second sealing structure opens the second gap (740); The second sealing structure comprises an annular second sealing portion (510) and an annular second avoidance groove (420), one of the second sealing portion (510) and the second avoidance groove (420) being arranged on the inner wall of the rotating component (400), and the other being arranged on the outer wall of the inner distributing member (500), wherein when the rotating component (400) moves to the second position, the second sealing portion (510) moves to the second avoidance groove (420), and when the rotating component (400) moves to the first position, the second sealing portion (510) abuts against and seals against a side wall of the second avoidance groove (420); The second sealing structure includes a second sealing ring (820) and a second sealing surface (440) arranged relative to each other along the rotation axis of the rotating component (400), one of the second sealing ring (820) and the second sealing surface (440) is arranged on the air drive device (300) and the other is arranged on the rotating component (400), when the rotating component (400) moves to the first position, the second sealing ring (820) and the second sealing surface (440) abut and seal, and when the rotating component (400) moves to the second position, the gap between the second sealing ring (820) and the second sealing surface (440) is connected to the second gap (740).

9. A rotary powder spreader according to any one of claims 1 to 8, characterized in that: The rotating assembly (400) is mounted on the housing (100) via a bearing (200), and the first sealing structure is at least partially located on a side of the bearing (200) facing away from the air drive device (300).

10. The rotary powder spreader according to claim 5, characterized in that: The air drive device supplies air through an air supply channel (530), and the air supply channel (530) is provided with a filter plate (310) for filtering air flow; The housing (100) has a connecting end (120) at one end facing away from the rotating assembly (400), and the connecting end (120) is used to connect to the barrel of the spray gun, wherein the air supply channel (530) inputs air flow from the barrel of the spray gun, or the housing (100) is provided with an air supply interface for communicating with the air supply channel (530); The driving structure between the air drive device (300) and the rotating assembly (400) is configured as a pneumatic turbine; A powder dispersing channel (710) is formed between the rotating assembly (400) and the inner dispersing member (500), a powder input channel (720) is provided inside the inner dispersing member (500) or between the inner dispersing member (500) and the outer shell (100), the powder input channel (720) is communicated with the powder dispersing channel (710), and the powder dispersing channel (710) is located on a side of the second gap (740) away from the air drive device (300) and is communicated with the second gap (740); A discharge structure (520) is provided at one end of the inner dispersing member (500) facing away from the gas driving device (300), and the discharge structure (520) is located at the center of the powder dispersing channel (710); At least one of the housing (100), the rotating assembly (400), and the air drive device (300) is made of non-metallic material.

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