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 driving rotor and a driven rotor, the driving rotor and the driven rotor are both located in the containing cavity, the driving rotor, the driven rotor and the wall face of the containing cavity jointly define a volume change cavity, the driving rotor can drive the driven rotor to rotate, and when the driving rotor drives the driven rotor to rotate, the volume of the volume change cavity changes; the transmission shaft is connected with the driving rotor; and the limiting structure is arranged between the transmission shaft and the pump shell, and the limiting structure is used for limiting movement of the transmission shaft relative to the pump shell in the axis direction of the transmission shaft. According to the spherical rotor pump, the movement of the transmission shaft relative to the pump shell in the axis direction of the transmission shaft can be limited through the limiting structure, so that the movement of the driving rotor in the axis direction of the transmission shaft can be further limited, and the problem that the rotor assembly is prone to axial movement is 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. The spherical rotor pump generally comprises a pump casing and a rotor assembly disposed in the pump casing. The function of pumping water can be achieved through the rotation of the rotor assembly.

[0003] In the related art, the rotor assembly includes a driving rotor and a driven rotor. Due to the limitation of machining accuracy, there may be a movable space after the rotor assembly and the pump housing are assembled. This makes the rotor assembly prone to axial movement, thereby increasing the friction between the rotor assembly and the pump housing. Utility Model Content

[0004] The present application provides a spherical rotor pump and a tooth cleaning device, aiming to improve the problem that the rotor assembly of the spherical rotor pump is prone to axial movement. The specific technical solution is as follows:

[0005] In a first aspect, the present application provides a spherical rotor pump, comprising: a pump casing having an accommodating chamber; a rotor assembly, wherein the rotor assembly comprises an active rotor and a driven rotor, wherein the active rotor and the driven rotor are both located in the accommodating chamber, wherein the active rotor, the driven rotor and the wall of the accommodating chamber jointly define a variable volume chamber, wherein the active rotor can drive the driven rotor to rotate, and when the active rotor drives the driven rotor to rotate, the volume of the variable volume chamber changes; a transmission shaft, wherein the transmission shaft is connected to the active rotor; and a limiting structure, wherein the limiting structure is arranged between the transmission shaft and the pump casing, and wherein the limiting structure is used to limit the movement of the transmission shaft relative to the pump casing along its own axial direction.

[0006] The spherical rotor pump in the embodiment of the present application has a limiting structure between the transmission shaft and the pump housing. The limiting structure can limit the movement of the transmission shaft relative to the pump housing along its own axial direction. Since the transmission shaft is connected to the active rotor in the rotor assembly, the movement of the active rotor along the axial direction of the transmission shaft can be further limited to reduce the possibility of axial movement of the active rotor, thereby improving the problem of axial movement of the rotor assembly.

[0007] In some embodiments, the pump casing forms a limiting surface; the limiting structure includes: a first component, the first component is connected to the transmission shaft so that the first component is fixed relative to the transmission shaft along the axial direction of the transmission shaft; a second component, the second component is fixedly connected to the pump casing; and a gasket, the gasket abuts against the limiting surface, and the first component is limited between the gasket and the second component.

[0008] In some embodiments, the first component is a bearing sleeved on the transmission shaft.

[0009] In some embodiments, the bearing includes a bearing outer ring and a bearing inner ring connected to the bearing outer ring, one end of the bearing outer ring abuts against the gasket, and the other end of the bearing outer ring abuts against the second component; the limiting structure also includes a third component, the third component is fixedly connected to the transmission shaft, and the third component abuts against one end of the bearing inner ring away from the gasket.

[0010] In some embodiments, the third component is a retaining spring sleeved on the transmission shaft, or the third component is a pin fixedly mounted on the transmission shaft.

[0011] In some embodiments, the first component is a retaining spring sleeved on the transmission shaft, or the first component is a pin fixedly mounted on the transmission shaft.

[0012] In some embodiments, the second component is a snap ring fixedly connected to the pump housing.

[0013] In some embodiments, the pump housing further has an installation cavity, the limiting structure is located in the installation cavity, a portion of the transmission shaft is located in the accommodating cavity, and another portion of the transmission shaft is located in the installation cavity; the retaining ring is interference fit with the installation cavity.

[0014] In some embodiments, the driving rotor and the driven rotor are connected via a pin shaft, so that the driven rotor can rotate around the pin shaft relative to the driving rotor.

[0015] In some embodiments, the active rotor includes a first support member and a first encapsulated body, a portion of the structure of the first support member is wrapped inside the first encapsulated body to serve as an inner skeleton of the active rotor, and another portion of the structure of the first support member is located outside the first encapsulated body to form a connecting portion; the driven rotor includes a second support member and a second encapsulated body, the second encapsulated body covers at least a portion of the second support member; a through groove is provided on the second encapsulated body, the connecting portion extends into the interior of the second encapsulated body through the through groove, and is connected to the second support member through the pin shaft.

[0016] In some embodiments, the width of the through slot is greater than the width of the connecting portion, so that there is a distance between the connecting portion and the side wall of the through slot.

[0017] In some embodiments, the transmission shaft is fixedly connected to the first support member, or the transmission shaft and the first support member are an integrated structure; the first support member and the second support member are metal members.

[0018] In some embodiments, the active rotor has a first axis, and the active rotor can rotate around the first axis relative to the pump housing; the driven rotor has a second axis, and the driven rotor can rotate around the second axis relative to the pump housing, and the first axis intersects with the second axis; the pin shaft intersects with both the first axis and the second axis.

[0019] In some embodiments, a groove is provided on the driven rotor, and a pin shaft portion is formed on the active rotor, the surface of the pin shaft portion is a cylindrical surface or a semi-cylindrical surface, the pin shaft portion is confined in the groove and can rotate around a third axis relative to the groove; the central axis of the pin shaft coincides with the third axis.

[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 teeth cleaning device in the embodiment of the present application, a spherical rotor pump is provided with a limiting structure between the transmission shaft and the pump housing. The limiting structure can limit the movement of the transmission shaft relative to the pump housing along its own axial direction. Since the transmission shaft is connected to the active rotor in the rotor assembly, the movement of the active rotor along the axial direction of the transmission shaft can be further limited to reduce the possibility of axial movement of the active rotor, thereby improving the problem of axial movement of the rotor assembly. 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 for Figure 2 Schematic cross-sectional view of section AA;

[0025] Figure 4 An exploded schematic diagram of a spherical rotor pump provided in one embodiment of the present application;

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

[0029] Figure 8 A schematic diagram of the structure of an active rotor provided in one embodiment of the present application;

[0030] Fig. 9 A schematic diagram of the structure of a rotor assembly provided in one embodiment of the present application (the first colloid package and the second colloid package are omitted in the figure);

[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; 102. Mounting chamber; 107. First housing; 108. Second housing; 111. Limiting surface;

[0036] 2. Rotor assembly; 201. Active rotor; 202. Driven rotor; 203. Variable volume cavity; 204. First support member; 2041. Connecting portion; 205. First colloid package; 206. Second support member; 207. Second colloid package; 2071. Through slot; 208. Pin shaft; 209. Pin shaft portion; 210. Groove;

[0037] 3. Transmission shaft;

[0038] 5. driving device; 501 output shaft; 502 main body;

[0039] 6. Bearing; 601. Bearing inner ring; 602. Bearing outer ring;

[0040] 10. Limiting structure; 1001. First component; 1002. Second component; 1003. Third component; 1004. Gasket;

[0041] 11. Circlip;

[0042] 12. Snap ring. DETAILED DESCRIPTION

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] A spherical rotor pump is a positive displacement water delivery device. The spherical rotor pump generally comprises a pump casing and a rotor assembly disposed in the pump casing. The function of pumping water can be achieved through the rotation of the rotor assembly.

[0049] In the related art, the rotor assembly includes a driving rotor and a driven rotor. Due to the limitation of machining accuracy, there may be a movable space after the rotor assembly and the pump housing are assembled. This makes the rotor assembly prone to axial movement, thereby increasing the friction between the rotor assembly and the pump housing.

[0050] Based on this, an embodiment of the first aspect of the present application provides a spherical rotor pump, which aims to improve the problem that the rotor assembly of the spherical rotor pump is prone to axial movement.

[0051] like Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, the spherical rotor pump 100 provided in the first embodiment of the present application includes a pump housing 1, a rotor assembly 2, a transmission shaft 3 and a limiting structure 10. The pump housing 1 has a housing chamber 101, and the rotor assembly 2 includes an active rotor 201 and a driven rotor 202. The active rotor 201 and the driven rotor 202 are both located in the housing chamber 101. The active rotor 201, the driven rotor 202 and the wall surface of the housing chamber 101 jointly define a variable volume chamber 203. The active rotor 201 can drive the driven rotor 202 to rotate, and when the active rotor 201 drives the driven rotor 202 to rotate, the volume of the variable volume chamber 203 changes. The transmission shaft 3 is connected to the active rotor 201, and the limiting structure 10 is arranged between the transmission shaft 3 and the pump housing 1. The limiting structure 10 is used to limit the movement of the transmission shaft 3 relative to the pump housing 1 along its own axis direction.

[0052] Specifically, the transmission shaft 3 is used to connect with the driving device 5, and the driving device 5 can provide power. When the driving device 5 is working, it can drive the active rotor 201 to rotate through the transmission shaft 3. In the process of the active rotor 201 driving the driven rotor 202 to rotate, the position and volume of the variable cavity 203 change. Usually, a liquid inlet and a liquid outlet are provided on the pump housing 1. As the rotor assembly 2 rotates, the same variable cavity 203 will alternately connect the liquid inlet and the liquid outlet. Moreover, the volume of the variable cavity 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 cavity 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.

[0053] The spherical rotor pump 100 in the embodiment of the present application is provided with a limiting structure 10 between the transmission shaft 3 and the pump housing 1. The limiting structure 10 can limit the movement of the transmission shaft 3 relative to the pump housing 1 along its own axial direction. Since the transmission shaft 3 is connected to the active rotor 201 in the rotor assembly 2, the movement of the active rotor 201 along the axial direction of the transmission shaft 3 can be further limited to reduce the possibility of axial movement of the active rotor 201, thereby improving the problem of axial movement of the rotor assembly 2.

[0054] In some embodiments, Figure 3 As shown, the pump housing 1 forms a limited position surface 111, and the limiting structure 10 includes a first component 1001, a second component 1002, and a gasket 1004. The first component 1001 is connected to the transmission shaft 3 so that the first component 1001 is fixed relative to the transmission shaft 3 along the axial direction of the transmission shaft 3, the second component 1002 is fixedly connected to the pump housing 1, the gasket 1004 abuts against the limited position surface 111, and the first component 1001 is limited between the gasket 1004 and the second component 1002.

[0055] The first component 1001 is restricted between the gasket 1004 and the second component 1002, so that the movement of the first component 1001 along the axis direction of the transmission shaft 3 is restricted. Because the first component 1001 is connected to the transmission, the movement of the transmission shaft 3 relative to the pump housing 1 along its own axis direction is restricted.

[0056] In one embodiment, Figure 3 , Figure 5 As shown, the first component 1001 is a bearing 6 sleeved on the transmission shaft 3. In this embodiment, the bearing 6 sleeved on the transmission shaft 3 is restricted between the gasket 1004 and the second component 1002, thereby restricting the movement of the transmission shaft 3 along its own axis. In addition, the bearing 6 can contact the wall surface of the pump housing 1, so that the centering accuracy of the transmission shaft 3 during installation can be improved by the bearing 6. In addition, in the process of the driving device 5 driving the transmission shaft 3 to rotate, it can also ensure that the position of the transmission shaft 3 does not deviate, thereby improving the position stability of the transmission shaft 3.

[0057] Furthermore, if Figure 3 As shown, the bearing 6 includes a bearing outer ring 602 and a bearing inner ring 601 connected to the bearing outer ring 602, wherein the bearing inner ring 601 is fastened to the transmission shaft 3, so that the bearing 6 is fixed relative to the transmission shaft 3 along the axial direction of the transmission shaft 3. One end of the bearing outer ring 602 abuts against the gasket 1004, and the other end of the bearing outer ring 602 abuts against the second component 1002, that is, the bearing outer ring 602 is restricted between the gasket 1004 and the second component 1002. Thus, the movement of the transmission shaft 3 relative to the pump housing 1 along its own axial direction is restricted.

[0058] Furthermore, if Figure 3 , Figure 5As shown, the limiting structure 10 may further include a third member 1003, the third member 1003 is fixedly connected to the transmission shaft 3, and the third member 1003 abuts against one end of the bearing inner ring 601 away from the gasket 1004. By providing the third member 1003, the axial stability between the transmission shaft 3 and the bearing 6 can be further ensured, and the tight fit between the bearing inner ring 601 and the transmission shaft 3 is prevented from loosening, thereby causing the transmission shaft 3 to move relative to the bearing 6.

[0059] Specifically, the third member 1003 can be a retaining spring 11 sleeved on the transmission shaft 3, which has the advantage of easy installation. In other embodiments, the third member 1003 can also be a pin fixedly installed on the transmission shaft 3. Using the pin as the third member 1003 has the advantage of stable connection.

[0060] In another embodiment, the first member 1001 is a retaining spring 11 sleeved on the transmission shaft 3, or the first member 1001 is a pin fixedly mounted on the transmission shaft 3. In this embodiment, no bearing is provided on the transmission shaft 3, and at this time, the retaining spring 11 or the pin sleeved on the transmission shaft 3 is restricted between the gasket 1004 and the second member 1002, thereby restricting the movement of the transmission shaft 3 along its own axial direction.

[0061] In some embodiments, Figure 3 , Figure 5 As shown, the second component 1002 is a snap ring 12 fixedly connected to the pump housing 1. Using the snap ring 12 as the second component 1002 has the advantages of easy installation, convenient material acquisition, and low cost.

[0062] Furthermore, if Figure 3 As shown, the pump housing 1 also has an installation cavity 102, the limiting structure 10 is located in the installation cavity 102, a part of the transmission shaft 3 is located in the accommodating cavity 101, another part of the transmission shaft 3 is located in the installation cavity 102, and the snap ring 12 is interference fit with the installation cavity 102. In this embodiment, the pump housing 1 has an accommodating cavity 101 and an installation cavity 102, the accommodating cavity 101 is used to accommodate the rotor assembly 2, and the installation cavity 102 can be used to accommodate the output shaft 501 of the drive device 5, so that the installation cavity 102 can be used to protect the output shaft 501 of the drive device 5. The limiting structure 10 and a part of the transmission shaft 3 are also located in the installation cavity 102, so that the limiting structure 10 and the transmission shaft 3 can also be under the protection of the installation cavity 102, so that external debris will not touch the output shaft 501, the transmission shaft 3, the limiting structure 10, etc. On this basis, the snap ring 12 can be interference fit with the installation cavity 102 to achieve a fixed connection between the second component 1002 (snap ring 12) and the pump housing 1.

[0063] In some embodiments, Figure 3 , Figure 4As 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, the first housing 107 and the second housing 108 jointly define a receiving chamber 101, and the second housing 108 defines a mounting chamber 102. 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, and the output shaft 501 is located in the mounting chamber 102 and connected to the transmission shaft 3.

[0064] In some embodiments, Figure 3 , Figure 4 , Figure 6 , Figure 7 as well as Figure 8 As shown, the driving rotor 201 and the driven rotor 202 are connected by a pin shaft 208, so that the driven rotor 202 can rotate around the pin shaft 208 relative to the driving rotor 201. In this embodiment, the driving rotor 201 and the driven rotor 202 are connected by the pin shaft 208, so that the driving rotor 201 and the driven rotor 202 are connected together. In this way, the driving rotor 201 and the driven rotor 202 become an integral structure. In this way, on the basis of the limiting structure 10 limiting the movement of the transmission shaft 3 relative to the pump housing 1 along its own axis direction, the possibility of the driving rotor 201 and the driven rotor 202 being moved can be reduced, thereby improving the position stability of the driving rotor 201 and the driven rotor 202 relative to the pump housing 1.

[0065] In some embodiments, Figure 3 , Figure 6 , Figure 7 , Figure 8 as well as Fig. 9 As shown, the active rotor 201 includes a first support member 204 and a first encapsulated body 205, a part of the structure of the first support member 204 is wrapped inside the first encapsulated body 205 to serve as the inner skeleton of the active rotor 201, and another part of the structure of the first support member 204 is located outside the first encapsulated body 205 to form a connecting portion 2041. The driven rotor 202 includes a second support member 206 and a second encapsulated body 207, and the second encapsulated body 207 covers at least a part of the second support member 206. The second encapsulated body 207 is provided with a through slot 2071, and the connecting portion 2041 extends into the interior of the second encapsulated body 207 through the through slot 2071, and is connected to the second support member 206 through a pin 208.

[0066] In this embodiment, the active rotor 201 includes a first support member 204 and a first encapsulated body 205. The first support member 204 can be made of a material with high strength, thereby improving the overall structural strength of the active rotor 201. The outside of the active rotor 201 is the first encapsulated body 205, and the first encapsulated body 205 can better form a gap seal with the inner wall of the pump housing 1. Similarly, the driven rotor 202 includes a second support member 206 and a second encapsulated body 207. The second support member 206 can be made of a material with high strength, thereby improving the overall structural strength of the driven rotor 202. The outside of the driven rotor 202 is the second encapsulated body 207, and the second encapsulated body 207 can better form a gap seal with the inner wall of the pump housing 1.

[0067] In addition, a part of the structure of the first support member 204 is wrapped inside the first encapsulated body 205, and another part of the structure is located outside the first encapsulated body 205 to form a connecting portion 2041. A through slot 2071 is provided on the second encapsulated body 207, and the connecting portion 2041 extends into the interior of the second encapsulated body 207 through the through slot 2071, and is connected to the second support member 206 through a pin 208. In this way, the first support member 204 and the second support member 206 are connected through the pin 208, thereby realizing the connection between the active rotor 201 and the driven rotor 202, so that the active rotor 201 and the driven rotor 202 form an integral structure.

[0068] Furthermore, if Figure 3 As shown, the width of the through slot 2071 is greater than the width of the connecting portion 2041, so that there is a gap between the connecting portion 2041 and the side wall of the through slot 2071. In this way, the connecting portion 2041 has a certain swing space, so that when the active rotor 201 drives the driven rotor 202 to rotate, the connecting portion 2041 can be prevented from interfering with the second encapsulated body 207.

[0069] Furthermore, the transmission shaft 3 can be fixedly connected to the first support member 204, that is, the two can be manufactured separately and then connected by screw connection, rivet connection, welding, etc. Alternatively, the transmission shaft 3 and the first support member 204 are an integrated structure, that is, the two can be processed and formed by the same manufacturing process (such as metal casting).

[0070] Furthermore, the first support member 204 and the second support member 206 are metal members, so that the first support member 204 and the second support member 206 have high strength, and the metal members are used as the inner skeleton of the active rotor 201 and the driven rotor 202, which can improve the overall structural strength of the active rotor 201 and the driven rotor 202.

[0071] In some embodiments, Figure 4As shown, the active rotor 201 has a first axis a, and the active rotor 201 can rotate around the first axis a relative to the pump housing 1. The driven rotor 202 has a second axis b, and the driven rotor 202 can rotate around the second axis b relative to the pump housing 1. The first axis a intersects with the second axis b; the pin 208 intersects with both the first axis a and the second axis b.

[0072] In this embodiment, the first axis a of the active rotor 201 intersects with the second axis b of the driven rotor 202, and the pin 208 intersects with both the first axis a and the second axis b. When the active rotor 201 drives the driven rotor 202 to rotate, the active rotor 201 rotates continuously around the first axis, and the driven rotor 202 rotates continuously around the second axis b. At the same time, the driven rotor 202 performs reciprocating swinging motion around the pin 208. In this process, the volume of the variable capacity cavity 203 defined by the active rotor 201, the driven rotor 202 and the wall of the accommodating cavity 101 can be changed.

[0073] In some embodiments, Figure 6 , Figure 7 and Figure 8 As shown, a groove 210 is provided on the driven rotor 202, and a pin shaft portion 209 is formed on the active rotor 201. The surface of the pin shaft portion 209 is a cylindrical surface or a semi-cylindrical surface. 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 central axis of the pin shaft 208 coincides with the third axis c.

[0074] Through the cooperation of the pin shaft portion 209 and the groove 210, a seal can be formed between the active rotor 201 and the driven rotor 202, so that the active rotor 201, the driven shaft and the wall of the accommodating chamber 101 can define a sealed variable cavity 203. In addition, the pin shaft portion 209 is restricted in the groove 210 and can rotate around the third axis c relative to the groove 210, that is, the third axis c is the rotation center of the pin shaft portion 209. On this basis, the central axis of the pin shaft 208 is made to coincide with the third axis c, so that during the process of the driven rotor 202 making a reciprocating swinging motion around the pin shaft 208, the pin shaft portion 209 can always be in a good cooperation state with the groove 210, so that a good seal can be maintained between the active rotor 201 and the driven rotor 202. On the other hand, coinciding the central axis of the pin shaft 208 with the third axis c is also conducive to smooth movement of the rotor assembly 2 and preventing movement jamming.

[0075] 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.10As 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 .

[0076] In the tooth cleaning device 1000 in the embodiment of the present application, a spherical rotor pump 100 is provided with a limiting structure 10 between the transmission shaft 3 and the pump housing 1. The limiting structure 10 can limit the movement of the transmission shaft 3 relative to the pump housing 1 along its own axial direction. Since the transmission shaft 3 is connected to the active rotor 201 in the rotor assembly 2, the movement of the active rotor 201 along the axial direction of the transmission shaft 3 can be further limited to reduce the possibility of axial movement of the active rotor 201, thereby improving the problem of easy axial movement of the rotor assembly 2.

[0077] 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, wherein the pump housing has a receiving cavity; A rotor assembly, wherein the rotor assembly comprises an active rotor and a driven rotor, wherein the active rotor and the driven rotor are both located in the accommodating cavity, wherein the active rotor, the driven rotor and the wall surface of the accommodating cavity jointly define a variable capacity cavity, wherein the active rotor can drive the driven rotor to rotate, and when the active rotor drives the driven rotor to rotate, the volume of the variable capacity cavity changes; a transmission shaft connected to the driving rotor; and A limiting structure is provided between the transmission shaft and the pump housing, and is used for limiting the movement of the transmission shaft relative to the pump housing along its own axial direction.

2. The spherical rotor pump according to claim 1, characterized in that: The pump housing forms a finite surface; The limiting structure comprises: a first member connected to the transmission shaft so that the first member is fixed relative to the transmission shaft along an axial direction of the transmission shaft; a second member fixedly connected to the pump housing; and A gasket is in contact with the limiting surface, and the first component is limited between the gasket and the second component.

3. The spherical rotor pump according to claim 2, characterized in that: The first component is a bearing sleeved on the transmission shaft.

4. The spherical rotor pump according to claim 3, characterized in that: The bearing comprises a bearing outer ring and a bearing inner ring connected to the bearing outer ring, one end of the bearing outer ring abuts against the gasket, and the other end of the bearing outer ring abuts against the second member; The limiting structure further includes a third component, the third component is fixedly connected to the transmission shaft, and the third component abuts against an end of the bearing inner ring away from the gasket.

5. The spherical rotor pump according to claim 4, characterized in that: The third component is a retaining spring sleeved on the transmission shaft, or the third component is a pin fixedly mounted on the transmission shaft.

6. The spherical rotor pump according to claim 2, characterized in that: The first component is a retaining spring sleeved on the transmission shaft, or the first component is a pin fixedly mounted on the transmission shaft.

7. The spherical rotor pump according to claim 2, characterized in that: The second component is a clamping ring fixedly connected to the pump housing.

8. The spherical rotor pump according to claim 7, characterized in that: The pump housing further comprises an installation cavity, the limiting structure is located in the installation cavity, a part of the transmission shaft is located in the accommodating cavity, and another part of the transmission shaft is located in the installation cavity; The clamping ring is interference fit with the mounting cavity.

9. The spherical rotor pump according to claim 1, characterized in that: The driving rotor and the driven rotor are connected via a pin shaft, so that the driven rotor can rotate around the pin shaft relative to the driving rotor.

10. The spherical rotor pump according to claim 9, characterized in that: The active rotor comprises a first support member and a first encapsulated body, a part of the structure of the first support member is encapsulated inside the first encapsulated body to serve as an inner skeleton of the active rotor, and another part of the structure of the first support member is located outside the first encapsulated body to form a connecting portion; The driven rotor comprises a second support member and a second encapsulated body, wherein the second encapsulated body covers at least a portion of the second support member; The second colloid encapsulating body is provided with a through slot, the connecting portion extends into the interior of the second colloid encapsulating body through the through slot, and is connected to the second supporting member through the pin shaft.

11. The spherical rotor pump according to claim 10, characterized in that: The width of the through slot is greater than the width of the connecting portion, so that there is a distance between the connecting portion and the side wall of the through slot.

12. The spherical rotor pump according to claim 10, characterized in that: The transmission shaft is fixedly connected to the first support member, or the transmission shaft and the first support member are an integrated structure; the first support member and the second support member are metal members.

13. The spherical rotor pump according to claim 9, characterized in that: The driving rotor has a first axis, and the driving rotor is rotatable relative to the pump housing about the first axis; The driven rotor has a second axis, the driven rotor can rotate relative to the pump housing about the second axis, and the first axis intersects the second axis; The pin shaft intersects both the first axis and the second axis.

14. The spherical rotor pump according to claim 13, characterized in that The driven rotor is provided with a groove, the driving rotor is formed with a pin shaft portion, the surface of the pin shaft portion is a cylindrical surface or a semi-cylindrical surface, the pin shaft portion is confined in the groove and can rotate relative to the groove around a third axis; The center axis of the pin coincides with the third axis.

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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