Spherical rotor pump and tooth cleaning device

Abstract

The utility model provides a spherical rotor pump and a tooth cleaning device. The spherical rotor pump comprises a pump shell with a containing cavity; the rotor assembly comprises a first rotor and a second rotor, and the first rotor and the second rotor are both located in the containing cavity; the first rotor comprises a base part and a pin shaft part arranged on the base part, a groove is formed in the second rotor, and the pin shaft part is limited in the groove and can rotate around a third axis relative to the groove; the pin shaft part is provided with a first matching face and side faces located on the two sides of the first matching face, the first matching face is connected with the two side faces and is an arc-shaped face, the central angle of the first matching face is smaller than or equal to 180 degrees, and the minimum distance between the two side faces is equal to the chord length of the first matching face. Therefore, inverted buckling can be prevented from being formed between the side part forming the pin shaft part and the base part, so that the possibility that a rotor where the groove is located interferes with the pin shaft part or the base part when the pin shaft part and the groove rotate in a matched mode can be reduced, and the problem that abrasion is prone to occurring can be solved.

Description

Technical Field

[0001] The present application relates to the technical field of oral cleaning, and in particular to a spherical rotor pump and a teeth cleaning device. Background Art

[0002] A spherical rotor pump is a positive displacement water delivery device. A spherical rotor pump generally comprises a pump casing and a rotor assembly disposed in the pump casing. The rotor assembly comprises an active rotor and a driven rotor. The active rotor drives the driven rotor to rotate, thereby achieving the function of pumping water.

[0003] In the related art, the mating parts between the driving rotor and the driven rotor are prone to wear. Utility Model Content

[0004] The present application provides a spherical rotor pump and a tooth cleaning device, aiming to improve the problem that the mating parts between the active rotor and the driven rotor are prone to wear. The specific technical solution is as follows:

[0005] In a first aspect, the present application provides a spherical rotor pump, which comprises: a pump casing having an accommodating cavity; and a rotor assembly, wherein the rotor assembly comprises a first rotor and a second rotor, both of which are located in the accommodating cavity, the first rotor having a first axis, the first rotor being able to rotate around the first axis relative to the pump casing, the second rotor having a second axis, the second rotor being able to rotate around the second axis relative to the pump casing; wherein the first rotor comprises a base and a pin shaft portion arranged on the base, the second rotor being provided with a groove, the pin shaft portion being restricted in the groove and being able to rotate around a third axis relative to the groove; the pin shaft portion having a first mating surface and side surfaces located on both sides of the first mating surface, the first mating surface connecting the two side surfaces, the first mating surface being an arc-shaped surface with a central angle less than or equal to 180°, and the minimum distance between the two side surfaces being equal to the chord length of the first mating surface.

[0006] In the spherical rotor pump in the embodiment of the present application, the pin shaft portion has a first mating surface and side surfaces located on both sides of the first mating surface, wherein the first mating surface is an arcuate surface, and the first mating surface is used to cooperate with the groove so that the pin shaft portion is confined in the groove and can rotate around the third axis relative to the groove. Since the first mating surface is an arcuate surface and the central angle is less than or equal to 180°, the first mating surface will not have a tendency to shrink inward near the two sides. In addition, the minimum distance between the two side surfaces located on both sides of the first mating surface is equal to the chord length of the first mating surface, which will not cause the two side surfaces to shrink inward. In this way, it is possible to avoid the formation of an undercut between the side and base of the pin shaft portion, thereby reducing the possibility of interference between the rotor where the groove is located and the pin shaft portion or the base when the pin shaft portion rotates in cooperation with the groove, thereby improving the problem of easy wear.

[0007] In some embodiments, the two side surfaces are both planes, and the two side surfaces are arranged parallel to each other; or, the two side surfaces are both curved surfaces.

[0008] In some embodiments, both of the side surfaces are planes, and an angle between a spatial plane where one of the side surfaces is located and a spatial plane where the other side surface is located is greater than 0° and less than or equal to 15°.

[0009] In some embodiments, the groove has a second mating surface and avoidance portions located on both sides of the mating surface, the second mating surface is an arc-shaped surface, the second mating surface is used to cooperate with the first mating surface, and there is a gap between the avoidance portion and the pin shaft portion.

[0010] In some embodiments, the gap between the avoidance portion and the pin shaft portion gradually decreases along a direction approaching the second mating surface.

[0011] In some embodiments, the gap is equal to 0.05 mm and less than or equal to 0.6 mm.

[0012] In some embodiments, the base has two first planar portions facing the second rotor, and the two first planar portions are located on both sides of the pin shaft portion; the second rotor has two second planar portions facing the base, and the two second planar portions are arranged one by one opposite to the two first planar portions; the pin shaft portion, the wall surface of the accommodating cavity, the first planar portion and the corresponding second planar portion jointly define a variable cavity, and the volume of the variable cavity changes during the rotation of the pin shaft portion around the third axis relative to the groove.

[0013] In some embodiments, the end of the avoidance portion away from the second mating surface is the first end, the end of the avoidance portion close to the second mating surface is the second end, the line connecting the first end and the third axis is the first line, the line connecting the second end and the third axis is the second line, and there is a first angle between the first line and the second line; the end of the side surface away from the first mating surface is the third end, the end of the side surface close to the first mating surface is the fourth end, the line connecting the third end and the third axis is the third line, the line connecting the fourth end and the third axis is the fourth line, and there is a second angle between the third line and the fourth line; the first angle is greater than the second angle.

[0014] In some embodiments, the second angle is less than 40°.

[0015] In some embodiments, the spherical rotor pump has a first state, in which the volume of one of the two variable-volume chambers reaches a minimum value, and the volume of the other of the two variable-volume chambers reaches a maximum value; in the first state, the first planar portion and the corresponding second planar portion in any of the variable-volume chambers maintain a distance.

[0016] In some embodiments, a transition chamfer is formed between the clearance portion and the second planar portion.

[0017] In some embodiments, the first mating surface and the second mating surface are made of materials with the same expansion coefficient.

[0018] In some embodiments, the first mating surface and the second mating surface are made of the same material.

[0019] In some embodiments, the base also has an outer surface that matches the wall of the accommodating cavity, and the outer surface is a spherical surface; the end surfaces of both ends of the pin shaft portion along the third axis direction are spherical surfaces consistent with the outer surface.

[0020] In a second aspect, the present application provides a teeth cleaning device, which includes the spherical rotor pump in any of the above embodiments.

[0021] In the tooth cleaning device in the embodiment of the present application, the pin shaft portion in the spherical rotor pump has a first mating surface and side surfaces located on both sides of the first mating surface, wherein the first mating surface is an arcuate surface, and the first mating surface is used to cooperate with the groove so that the pin shaft portion is confined in the groove and can rotate around the third axis relative to the groove. Since the first mating surface is an arcuate surface and the central angle is less than or equal to 180°, the first mating surface will not have a tendency to shrink inwards at positions close to both sides. In addition, the minimum distance between the two side surfaces located on both sides of the first mating surface is equal to the chord length of the first mating surface, which will not cause the two side surfaces to shrink inwards. In this way, it is possible to avoid the formation of an undercut between the side and base of the pin shaft portion, thereby reducing the possibility of interference between the rotor where the groove is located and the pin shaft portion or the base when the pin shaft portion rotates in cooperation with the groove, thereby improving the problem of easy wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of a spherical rotor pump provided in one embodiment of the present application;

[0023] Figure 2 A schematic diagram of the structure of a spherical rotor pump provided in one embodiment of the present application from another perspective;

[0024] Figure 3 In one embodiment Figure 2 A schematic cross-sectional view of section AA of the structure shown;

[0025] Figure 4 for Figure 3 A partial enlarged schematic diagram of

[0026] Figure 5 An exploded schematic diagram of a spherical rotor pump provided in one embodiment of the present application;

[0027] Figure 6 A schematic diagram of the structure of a rotor assembly provided in one embodiment of the present application;

[0028] Figure 7 A schematic diagram of the structure of a first rotor provided in an embodiment of the present application;

[0029] Figure 8 A schematic structural diagram of a first rotor provided in an embodiment of the present application from another perspective;

[0030] Fig. 9 A schematic diagram of the structure of a second rotor provided in one embodiment of the present application;

[0031] Fig.10 This is a schematic diagram of the structure of a teeth cleaning device provided in one embodiment of the present application.

[0032] Description of reference numerals:

[0033] 1000. Teeth cleaning device;

[0034] 100, spherical rotor pump; 200, body; 300, nozzle;

[0035] 1. Pump housing; 101. Accommodating chamber; 107. First housing; 108. Second housing;

[0036] 2. rotor assembly; 202. first rotor; 201. second rotor; 2021. second plane portion; 203. variable capacity cavity;

[0037] 209, pin shaft portion; 2091, first mating surface; 2092, side surface; 2093, third end; 2094, fourth end; 2095, end surface;

[0038] 210, groove; 2101, second mating surface; 2102, air avoidance portion; 2103, first end; 2104, second end; 2105, transition chamfer;

[0039] 214, base; 2141, first plane portion; 2142, outer surface;

[0040] 3. Transmission shaft;

[0041] 5. driving device; 501 output shaft; 502. main body. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application 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 application and are not used to limit the present application.

[0043] In the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for the convenience of describing the present application and simplifying the description, and does 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, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as suggesting or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0045] In the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0047] A spherical rotor pump is a positive displacement water delivery device. A spherical rotor pump generally comprises a pump casing and a rotor assembly disposed in the pump casing. The rotor assembly comprises an active rotor and a driven rotor. The active rotor drives the driven rotor to rotate, thereby achieving the function of pumping water.

[0048] In the related art, the mating part between the active rotor and the driven rotor is prone to wear. After a lot of research, the inventor found that the reason why the mating part between the active rotor and the driven rotor is prone to wear is that in the related art, one of the active rotor and the driven rotor is provided with a base and a pin shaft connected to the base, and the other is provided with a groove, and the pin shaft is confined in the groove and can rotate relative to the groove. Among them, the opposite sides of the pin shaft tend to shrink inward near the root (the connection position between the pin shaft and the base), which forms an undercut between the side of the pin shaft and the base. In the process of the pin shaft and the groove rotating in coordination, the rotor where the groove is located is prone to interfere with the undercut structure, so that scratching, wear, jamming, etc. occur during rotation. This causes the problem of easy wear mentioned above.

[0049] Based on this, an embodiment of the first aspect of the present application provides a spherical rotor pump, which aims to improve the problem of easy wear at the mating parts between the active rotor and the driven rotor.

[0050] like Figures 1 to 8As shown, the spherical rotor pump 100 provided by the first embodiment of the present application includes a pump housing 1 and a rotor assembly 2, the pump housing 1 has a receiving chamber 101, the rotor assembly 2 includes a first rotor 202 and a second rotor 201, and the first rotor 202 and the second rotor 201 are both located in the receiving chamber 101. The first rotor 202 has a first axis b, and the first rotor 202 can rotate around the first axis b relative to the pump housing 1, and the second rotor 201 has a second axis a, and the second rotor 201 can rotate around the second axis a relative to the pump housing 1. Among them, the first rotor 202 includes a base 214 and a pin shaft portion 209 arranged on the base 214, and the second rotor 201 is provided with a groove 210, and the pin shaft portion 209 is confined in the groove 210 and can rotate around the third axis c relative to the groove 210. The pin shaft portion 209 has a first mating surface 2091 and side surfaces 2092 located on both sides of the first mating surface 2091. The first mating surface 2091 connects the two side surfaces 2092. The first mating surface 2091 is an arc surface with a central angle less than or equal to 180°. The minimum distance between the two side surfaces 2092 is equal to the chord length d of the first mating surface 2091 (please refer to Figure 8 ).

[0051] Specifically, one of the first rotor 202 and the second rotor 201 can be used as the active rotor, and the other can be used as the driven rotor. When the spherical rotor pump 100 is working, the active rotor can drive the driven rotor to rotate. During the rotation of the active rotor and the driven rotor, due to the cooperation between the pin shaft portion 209 and the groove 210, the driven rotor also makes a reciprocating swing around the third axis c relative to the active rotor. The active rotor and the driven rotor are both located in the accommodating chamber 101. The active rotor, the driven rotor and the wall surface of the accommodating chamber 101 jointly define a variable volume chamber 203. During the rotation of the driven rotor driven by the active rotor, the volume of the variable volume chamber 203 changes with the swing of the driven rotor. Usually, a liquid inlet and a liquid outlet are provided on the pump housing 1. The volume of the variable volume chamber 203 when it is connected to the liquid inlet is greater than the volume when it is connected to the liquid outlet. Therefore, as the variable volume chamber 203 rotates from the position connected to the liquid inlet to the position connected to the liquid outlet, the pressure in the accommodating chamber 101 will rise, thereby driving the liquid to be pumped out from the liquid outlet.

[0052] In the spherical rotor pump 100 in the embodiment of the present application, the pin shaft portion 209 has a first mating surface 2091 and side surfaces 2092 located on both sides of the first mating surface 2091, wherein the first mating surface 2091 is an arcuate surface, and the first mating surface 2091 is used to cooperate with the groove 210, so that the pin shaft portion 209 is confined in the groove 210 and can rotate around the third axis c relative to the groove 210. Since the first mating surface 2091 is an arcuate surface and the central angle is less than or equal to 180°, the first mating surface 2091 will not have a tendency to shrink inwards at positions close to both sides. In addition, the minimum distance between the two side surfaces 2092 located on both sides of the first mating surface 2091 is equal to the chord length d of the first mating surface 2091, which makes the two side surfaces 2092 also have no tendency to shrink inwards. In this way, the formation of undercuts between the side of the pin shaft portion 209 and the base 214 can be avoided, thereby reducing the possibility of interference between the rotor where the groove 210 is located and the pin shaft portion 209 or the base 214 when the pin shaft portion 209 and the groove 210 rotate in cooperation, thereby improving the problem of easy wear.

[0053] In some embodiments, Figure 3 , Figure 5 As shown, the pump housing 1 includes a first housing 107 and a second housing 108, the first housing 107 and the second housing 108 are connected, and the first housing 107 and the second housing 108 jointly define a housing chamber 101. The spherical rotor pump 100 also includes a driving device 5, the driving device 5 includes a main body 502 and an output shaft 501 connected to the main body 502, the main body 502 is connected to the second housing 108, the output shaft 501 is connected to one end of the transmission shaft 3, and the other end of the transmission shaft 3 is connected to one of the first rotor 202 and the second rotor 201. The driving device 5 is used to provide power. When the driving device 5 is working, the output shaft 501 drives the active rotor in the first rotor 202 and the second rotor 201 to rotate through the transmission shaft 3, and the active rotor further drives the driven rotor to be active. In addition, the main body 502 of the driving device 5 is connected to the second housing 108, so that the driving device 5 and the pump housing 1 can be formed into an integral structure.

[0054] In some embodiments, please refer to Figure 4 , both side surfaces 2092 are planes, and the two side surfaces 2092 are arranged parallel to each other. When the side surfaces 2092 are planes, it is advantageous to make the volume of the variable volume cavity 203 formed larger, thereby increasing the volume of liquid pumped in a single time. In addition, when the two side surfaces 2092 are parallel to each other, the distance between the two side surfaces 2092 at any position only needs to be equal to the chord length of the first mating surface 2091, so that the distance between the two side surfaces 2092 can meet the setting requirements.

[0055] In some other embodiments, the two side surfaces 2092 may also be curved surfaces, for example, arc-shaped curved surfaces.

[0056] At this time, it is necessary to obtain the position where the distance between the two side surfaces 2092 is the smallest, and ensure that the distance between the two side surfaces 2092 at this position is equal to the chord length of the first mating surface 2091 .

[0057] In some other embodiments, both side surfaces 2092 are planes, and the angle between the spatial plane where one of the side surfaces 2092 is located and the spatial plane where the other side surface 2092 is located is greater than 0° and less than or equal to 15°. In this embodiment, the angle between the spatial plane where one of the side surfaces 2092 is located and the spatial plane where the other side surface 2092 is located is α. When α is greater than 0°, the two side surfaces 2092 are not parallel to each other, but show a tendency to expand outward, and at this time, the formation of an undercut between the side of the pin shaft portion 209 and the base 214 can also be avoided. However, α should not be too large, otherwise it will cause the volume of the variable cavity 203 to be reduced. Therefore, in this embodiment, α is limited to the range of 0° to 15° to reduce the impact on the volume of the variable cavity 203.

[0058] In some embodiments, Figure 4 , Fig. 9 As shown, the groove 210 has a second mating surface 2101 and a clearance portion 2102 located on both sides of the mating surface, the second mating surface 2101 is an arcuate surface, the second mating surface 2101 is used to match with the first mating surface 2091, and there is a gap between the clearance portion 2102 and the pin shaft portion 209. In this embodiment, the groove 210 has a second mating surface 2101, and the second mating surface 2101 is an arcuate surface, so that it can better match with the first mating surface 2091 of the pin shaft portion 209. In addition, the groove 210 also has a clearance portion 2102 located on both sides of the second mating surface 2101, and there is a gap between the clearance portion 2102 and the pin shaft portion 209. In the process of the pin shaft and the groove 210 rotating in coordination, the clearance portion 2102 is used to avoid position, so as to prevent the edge position of the groove 210 from interfering with the pin shaft portion 209 and causing wear.

[0059] Furthermore, the gap between the clearance portion 2102 and the pin shaft portion 209 gradually decreases in the direction close to the second mating surface 2101. This arrangement is conducive to making the surface of the groove 210 smoother and preventing a sudden change at the location of the clearance portion 2102.

[0060] Furthermore, the gap between the avoidance portion 2102 and the pin shaft portion 209 is equal to 0.05 mm and less than or equal to 0.6 mm. If the gap size between the avoidance portion 2102 and the pin shaft portion 209 is too small, the effect of the avoidance portion 2102 in preventing wear will become less obvious; on the contrary, if the gap size between the avoidance portion 2102 and the pin shaft portion 209 is too large, particulate impurities are easily introduced between the groove 210 and the pin shaft portion 209, which will also lead to aggravated wear between the first rotor 202 and the second rotor 201, and even problems such as jamming and damage may occur. In this embodiment, the gap between the avoidance portion 2102 and the pin shaft portion 209 is set to a range of 0.05 mm to 0.6 mm, which can not only make the avoidance portion 2102 better play the role of preventing wear, but also better avoid the situation where particulate impurities are easily introduced between the groove 210 and the pin shaft portion 209.

[0061] In some embodiments, Figure 7 , Fig. 9 As shown, the base 214 has two first plane portions 2141 facing the second rotor 201, and the two first plane portions 2141 are located on both sides of the pin shaft portion 209. The second rotor 201 has two second plane portions 2021 facing the base 214, and the two second plane portions 2021 are arranged one by one opposite to the two first plane portions 2141. The pin shaft portion 209, the wall surface of the accommodating cavity 101, the first plane portion 2141 and the corresponding second plane portion 2021 jointly define the variable cavity 203. When the pin shaft portion 209 rotates relative to the groove 210 around the third axis, the volume of the variable cavity 203 changes.

[0062] In this embodiment, the surface of the base 214 facing the second rotor 201 is formed with two first plane portions 2141, and the surface of the second rotor 201 facing the first rotor 202 is formed with two second plane portions 2021, on this basis, the pin shaft portion 209, the wall surface of the accommodating cavity 101, the first plane portion 2141 and the second plane portion 2021 jointly define the variable cavity 203. Compared with the curved surface, the plane portion is easier to process and can also obtain higher processing accuracy, which is conducive to controlling the volume of the variable cavity 203.

[0063] In some embodiments, Figure 4As shown, the end of the avoidance portion 2102 away from the second mating surface 2101 is the first end 2103, the end of the avoidance portion 2102 close to the second mating surface 2101 is the second end 2104, the line connecting the first end 2103 and the third axis is the first line, the line connecting the second end 2104 and the third axis is the second line, and a first angle γ is formed between the first line and the second line; the end of the side surface 2092 away from the first mating surface 2091 is the third end 2093, the end of the side surface 2092 close to the first mating surface 2091 is the fourth end 2094, the line connecting the third end 2093 and the third axis is the third line, the line connecting the fourth end 2094 and the third axis is the fourth line, and a second angle θ is formed between the third line and the fourth line, wherein the first angle γ is greater than the second angle θ.

[0064] Such arrangement enables the extension length of the avoidance portion 2102 along the circumferential direction to be greater than the extension length of the side surface 2092 along the circumferential direction. This ensures that during the coordinated rotation of the pin shaft portion 209 and the groove 210, the avoidance portion 2102 can always effectively play a avoiding role to prevent interference and wear between the edge position of the groove 210 and the pin shaft portion 209.

[0065] Furthermore, the second angle is less than 40°. If the second angle is too large, then the first angle will be too large accordingly, which will cause the clearance portion 2102 to occupy too large an area in the groove 210, while the second mating surface 2101 to occupy too small an area in the groove 210, thereby affecting the mating stability between the pin shaft portion 209 and the groove 210, making it easy for the rotor assembly 2 to vibrate and cause noise when rotating.

[0066] In some embodiments, the spherical rotor pump 100 has a first state, in which the volume of one of the two variable-volume cavities 203 reaches a minimum value, and the volume of the other of the two variable-volume cavities 203 reaches a maximum value. In the first state, the first plane portion 2141 and the corresponding second plane portion 2021 in any variable-volume cavity 203 maintain a distance. This arrangement makes the minimum volume of the variable-volume cavity 203 greater than 0, that is, during the rotation of the rotor assembly 2, the volume of the variable-volume cavity 203 is always greater than 0, that is, the first plane portion 2141 and the second plane portion 2021 will never contact each other, so that the first plane portion 2141 and the second plane portion 2021 can be prevented from adhering to each other, and the spherical rotor pump 100 can be prevented from not being able to work normally due to the adhesion of the two.

[0067] In some embodiments, Fig. 9As shown, a transition chamfer 2105 is formed between the clearance portion 2102 and the second plane portion 2021. This arrangement allows a relatively gentle transition to be formed between the edge of the groove 210 and the second plane portion 2021, thereby reducing the possibility of interference and wear between the connection portion between the groove 210 and the second plane portion 2021 and the pin shaft portion 209.

[0068] In some embodiments, the first mating surface 2091 and the second mating surface 2101 are made of materials with the same expansion coefficient. During the rotation of the rotor assembly 2, heat will be generated due to friction between the first mating surface 2091 of the pin shaft portion 209 and the second mating surface 2101 of the groove 210. Under the influence of thermal expansion and contraction, the structure of the first rotor 202 at the first mating surface 2091 and the structure of the second rotor 201 at the second mating surface 2101 will expand. The first mating surface 2091 and the second mating surface 2101 are made of materials with the same expansion coefficient, so that the expansion degree of the two can be kept consistent. In this way, the first mating surface 2091 and the second mating surface 2101 can always maintain a good matching relationship, preventing the phenomenon of motion jamming due to poor matching.

[0069] Furthermore, the first mating surface 2091 and the second mating surface 2101 are made of the same material. In this way, the first mating surface 2091 and the second mating surface 2101 must have the same expansion coefficient to ensure that the first mating surface 2091 and the second mating surface 2101 can always maintain a good mating relationship during the rotation of the rotor assembly 2.

[0070] In some embodiments, Figure 7 As shown, the base 214 also has an outer surface 2142 for matching with the wall surface of the accommodating chamber 101, and the outer surface 2142 is a spherical surface. Therefore, it is beneficial for the first rotor 202 to rotate relatively smoothly relative to the pump housing 1. In addition, the end surfaces 2095 at both ends of the pin shaft portion 209 along the third axis direction are spherical surfaces consistent with the outer surface 2142, so that the end surfaces 2095 at both ends of the pin shaft portion 209 can be guaranteed to have good sealing performance with the pump housing 1, thereby ensuring the sealing performance of the variable cavity 203.

[0071] The second aspect of the present application provides a tooth cleaning device 1000, which includes the spherical rotor pump 100 in any of the above embodiments. Fig.10 As shown, the tooth cleaning device 1000 may include a body 200 , a nozzle 300 disposed on the body 200 , and a spherical rotor pump 100 for delivering liquid to the nozzle 300 .

[0072] In the tooth cleaning device 1000 in the embodiment of the present application, the pin shaft portion 209 in the spherical rotor pump 100 has a first mating surface 2091 and side surfaces 2092 located on both sides of the first mating surface 2091, wherein the first mating surface 2091 is an arcuate surface, and the first mating surface 2091 is used to cooperate with the groove 210 so that the pin shaft portion 209 is confined in the groove 210 and can rotate around the third axis relative to the groove 210. Since the first mating surface 2091 is an arcuate surface and the central angle is less than or equal to 180°, the first mating surface 2091 will not have a tendency to shrink inwards at positions close to both sides. In addition, the minimum distance between the two side surfaces 2092 located on both sides of the first mating surface 2091 is equal to the chord length d of the first mating surface 2091, which makes the two side surfaces 2092 also have no tendency to shrink inwards. In this way, the formation of an undercut between the side of the pin shaft portion 209 and the base 214 can be avoided, thereby reducing the possibility of interference between the rotor where the groove 210 is located and the pin shaft portion 209 or the base 214 when the pin shaft portion 209 and the groove 210 rotate in cooperation, thereby improving the problem of easy wear.

[0073] The above contents are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A spherical rotor pump, characterized in that: include: a pump housing having a receiving chamber; and A rotor assembly, the rotor assembly comprising a first rotor and a second rotor, the first rotor and the second rotor are both located in the accommodating cavity, the first rotor has a first axis, the first rotor can rotate relative to the pump housing around the first axis, the second rotor has a second axis, the second rotor can rotate relative to the pump housing around the second axis; The first rotor comprises a base and a pin portion disposed on the base, the second rotor is provided with a groove, the pin portion is restricted in the groove and can rotate relative to the groove around a third axis; The pin shaft portion has a first mating surface and side surfaces located on both sides of the first mating surface, the first mating surface connects the two side surfaces, the first mating surface is an arc surface and the central angle of the first mating surface is less than or equal to 180°, and the minimum distance between the two side surfaces is equal to the chord length of the first mating surface.

2. The spherical rotor pump according to claim 1, characterized in that: The two side surfaces are both planes, and the two side surfaces are arranged parallel to each other; Alternatively, both of the side surfaces are curved surfaces.

3. The spherical rotor pump according to claim 1, characterized in that: Both of the side surfaces are planes, and an angle between a spatial plane where one of the side surfaces is located and a spatial plane where the other side surface is located is greater than 0° and less than or equal to 15°.

4. The spherical rotor pump according to claim 1, characterized in that: The groove has a second mating surface and avoidance portions located on both sides of the mating surface, the second mating surface is an arcuate surface, the second mating surface is used to match with the first mating surface, and there is a gap between the avoidance portion and the pin shaft portion.

5. The spherical rotor pump according to claim 4, characterized in that: Along the direction approaching the second matching surface, the gap between the clearance portion and the pin shaft portion gradually decreases.

6. The spherical rotor pump according to claim 4, characterized in that: The gap is equal to 0.05 mm and less than or equal to 0.6 mm.

7. The spherical rotor pump according to claim 4, characterized in that: The base has two first plane portions facing the second rotor, the two first plane portions are located on both sides of the pin shaft portion, and the second rotor has two second plane portions facing the base, the two second plane portions are arranged opposite to the two first plane portions one by one; The pin shaft portion, the wall surface of the accommodating cavity, the first plane portion and the corresponding second plane portion jointly define a variable cavity. When the pin shaft portion rotates relative to the groove around the third axis, the volume of the variable cavity changes.

8. The spherical rotor pump according to claim 7, characterized in that: An end of the air avoidance portion away from the second mating surface is a first end, an end of the air avoidance portion close to the second mating surface is a second end, a line connecting the first end and the third axis is a first line, a line connecting the second end and the third axis is a second line, and a first angle is formed between the first line and the second line; An end of the side surface away from the first mating surface is a third end, an end of the side surface close to the first mating surface is a fourth end, a line connecting the third end and the third axis is a third line, a line connecting the fourth end and the third axis is a fourth line, and a second angle is formed between the third line and the fourth line; The first angle is greater than the second angle.

9. The spherical rotor pump according to claim 8, characterized in that: The second angle is less than 40°.

10. The spherical rotor pump according to claim 7, characterized in that: The spherical rotor pump has a first state, in which the volume of one of the two variable-volume chambers reaches a minimum value, and the volume of the other of the two variable-volume chambers reaches a maximum value; In the first state, the first plane portion and the corresponding second plane portion in any variable cavity maintain a distance.

11. The spherical rotor pump according to claim 7, characterized in that: A transition chamfer is formed between the avoidance portion and the second planar portion.

12. The spherical rotor pump according to claim 4, characterized in that: The first mating surface and the second mating surface are made of materials with the same expansion coefficient.

13. The spherical rotor pump according to claim 12, characterized in that: The first mating surface and the second mating surface are made of the same material.

14. The spherical rotor pump according to claim 1, characterized in that The base also has an outer surface for matching with the wall of the accommodating cavity, and the outer surface is a spherical surface; The end surfaces of both ends of the pin shaft portion along the third axis direction are spherical surfaces consistent with the outer surface.

15. A teeth cleaning device, characterized in that: A spherical rotor pump comprising the spherical rotor pump according to any one of claims 1 to 14.

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