Motor and heart pump

Abstract

The utility model discloses a motor and heart pump relates to motor field, motor includes motor main part and motor shaft subassembly, motor shaft subassembly includes rotating shaft and strutting piece, strutting piece is provided in the motor main part, the cooperation place of rotating shaft and strutting piece is equipped with first guide structure, and the first guide structure is equipped with second guide structure. And the first guide structure is used for guiding the lubricating liquid to be gathered at the matching part. The motor structure is simplified, the service life of the motor is prolonged, and the sealing performance of the internal space of the motor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a motor and a heart pump. Background Art

[0002] The motor of a micro-invasive artificial heart assist device needs to be placed in the human body, so strict requirements are placed on the overall sealing and performance safety of the motor. Most of the motors used in existing invasive artificial hearts are flushed with fluid, and the flushing fluid is continuously passed from the inside of the motor to achieve the dynamic sealing effect inside the motor. After the motor adds a flushing pipeline system, the complexity of the entire motor structure increases, and when the flushing liquid flows out of the motor, it will bring out a large amount of particulate matter from the wear inside the motor, which may cause damage to the human body after flowing into the human body. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the related art to a certain extent. To this end, the utility model provides a motor and a heart pump, which have the advantages of simplifying the motor structure, increasing the service life of the motor, and improving the sealing of the internal space of the motor.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A motor comprises a motor body and a motor shaft assembly, wherein the motor shaft assembly comprises a rotating shaft and a support member, wherein the support member is arranged on the motor body, and a first guiding structure is provided at a fitting position between the rotating shaft and the support member, wherein the first guiding structure is used to guide lubricating fluid to gather at the fitting position.

[0006] By setting a first guide structure at the fitting point of the rotating shaft and the support member, the first guide structure is used to enable the lubricating liquid applied to the fitting point of the rotating shaft and the support member to continuously accumulate at the fitting point when the motor is running. When the motor is running, the contact area between the rotating shaft and the support member is reduced, that is, the friction resistance between the rotating shaft and the support member is reduced, and the service life of the motor is increased.

[0007] At the same time, since the lubricating fluid gathered at the joint between the rotating shaft and the support member forms a fluid static pressure seal, when the motor is working in a specific scenario, such as when the motor is set in the body as a power source for a heart pump, the fluid static pressure seal formed by the lubricating fluid can prevent blood from entering the inner cavity of the motor body.

[0008] Optionally, the first guiding structure comprises a first helical structure and a second helical structure, the first helical structure and the second helical structure are arranged in sequence along the axial direction of the rotating shaft, and the first helical structure and the second helical structure have opposite rotation directions.

[0009] Optionally, the first spiral structure includes any one of a first spiral ridge or a first spiral groove, and the second spiral structure includes any one of a second spiral ridge or a second spiral groove.

[0010] Optionally, the support member includes a first bearing, an axial hole is formed on the motor body, the first bearing is arranged in the axial hole, and the first shaft neck of the rotating shaft is arranged in the bearing hole of the first bearing; the first spiral structure and the second spiral structure are formed on the first shaft neck, and the first spiral structure and the second spiral structure are arranged in sequence along the axial direction of the first shaft neck.

[0011] Optionally, the first spiral structure includes a first spiral ridge, and the second spiral structure includes a second spiral ridge, and the first spiral ridge and the second spiral ridge both protrude outward from the outer surface of the first shaft neck; or the first spiral structure includes a first spiral groove, and the second spiral structure includes a second spiral groove, and the first spiral groove and the second spiral groove are both formed on the outer surface of the first shaft neck.

[0012] Optionally, along the axial direction of the rotating shaft, the first spiral structure is a first spiral ridge, the second spiral structure is a second spiral ridge, and the first spiral ridge and the second spiral ridge have the same length.

[0013] Optionally, the first shaft neck includes a first end, a middle part and a second end connected in sequence, the first spiral structure is a first spiral groove, the second spiral structure is a second spiral groove, the groove is formed on the first end, the second spiral groove is formed on the second end, and the diameter of the middle part is smaller than the diameter of the first end and the diameter of the second end.

[0014] Optionally, the motor shaft assembly also includes a second bearing, the second journal of the rotating shaft is arranged in the second bearing, the second bearing is arranged in the inner cavity of the motor body, the first journal and the second journal are respectively located at two ends of the rotating shaft, and a second guide structure is formed on the second journal, and the second guide structure is used to guide the lubricating liquid to gather in the middle of the second journal.

[0015] Optionally, the second guiding structure comprises a third helical structure and a fourth helical structure, the third helical structure and the fourth helical structure are arranged in sequence along the axial direction of the first journal, and the third helical structure and the fourth helical structure have opposite rotation directions.

[0016] Optionally, the third spiral structure includes a third spiral ridge, and the fourth spiral structure includes a fourth spiral ridge, and both the third spiral ridge and the fourth spiral ridge protrude outward from the outer surface of the second shaft neck; or the third spiral structure includes a third spiral groove, and the fourth spiral structure includes a fourth spiral groove, and both the third spiral groove and the fourth spiral groove are formed on the outer surface of the second shaft neck.

[0017] In addition, the utility model also provides a heart pump, comprising any one of the above-mentioned motors. The reasoning process of the beneficial effects of the heart pump provided by the utility model and the above-mentioned motors is similar, and will not be repeated here.

[0018] These features and advantages of the utility model will be disclosed in detail in the following specific embodiments and drawings. The best implementation or means of the utility model will be fully presented in conjunction with the drawings, but it is not a limitation of the technical solution of the utility model. In addition, these features, elements and components appearing in each of the following texts and drawings are multiple, and are marked with different symbols or numbers for convenience, but all represent components with the same or similar structure or function. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the structure of an embodiment of the utility model;

[0021] Figure 2 It is a structural schematic diagram of another embodiment of the utility model;

[0022] Figure 3 The structure of the first journal in the above embodiment is schematically shown. Figure 1 ( Figure 2 (A in the figure is enlarged)

[0023] Figure 4 The structure of the first journal in the above embodiment is schematically shown. Figure 2 ( Figure 2 (enlarged view of point A in the figure);

[0024] Figure 5 This is a structural schematic diagram of another embodiment of the utility model.

[0025] Among them, 11, motor housing; 11a, inner cavity; 11b, shaft hole; 121, stator; 122, coil; 123, rotor; 131, rotating shaft; 1311, first journal; 1311a, middle part; 1311b, first end; 1311c, second end; 131a, second spiral groove; 131b, first spiral groove; 131d, third spiral groove; 131e, fourth spiral groove; 132, first bearing; 132a, bearing hole; 133, second spiral ridge; 134, first spiral ridge; 135, second bearing; 136, second journal. DETAILED DESCRIPTION

[0026] The following is a detailed description of embodiments of the present invention, examples of which 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 in the implementation manner are intended to be used to explain the present invention and should not be construed as limiting the present invention.

[0027] References in this specification to "one embodiment" or "an example" or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment itself may be included in at least one embodiment of the present patent disclosure. The appearance of the phrase "in one embodiment" in various places in the specification does not necessarily refer to the same embodiment.

[0028] The utility model provides a motor, comprising a motor body and a motor shaft assembly, such as Figure 1 As shown, the motor shaft assembly includes a rotating shaft 131 and a support member, the support member is arranged on the motor body, and the matching position between the rotating shaft 131 and the support member has a first guiding structure, and the first guiding structure is used to guide the lubricating fluid to gather at the matching position.

[0029] Specifically, refer to Figure 1 and Figure 2 The motor includes a motor body and a motor shaft assembly. The motor body is formed with an axial hole 11b, which is connected to the inner cavity 11a of the motor body. The motor body includes a motor housing 11, a rotor 123, a stator 121 and a coil 122. The stator 121 is a tubular structure, the side wall of the stator 121 is connected to the inner wall of the motor housing 11, and the coil 122 is arranged on the surface of the stator 121. The rotor 123 is made of permanent magnetic material. Optionally, the rotor 123 is made of magnetic steel, and the rotor 123 is formed with a through hole that penetrates the rotor 123 along the axial direction.

[0030] The motor shaft assembly includes a rotating shaft 131 and a support member, and the support member includes a first bearing 132, and the first bearing 132 is connected to the side wall of the shaft hole 11b. The first bearing 132 is formed with a bearing hole 132a, and the rotating shaft 131 passes through the through hole and the bearing hole 132a, and one end of the rotating shaft 131 is located outside the motor body. The part of the rotating shaft 131 located at the first bearing 132 is the first journal 1311 of the first rotating shaft 131. The matching part of the rotating shaft 131 and the support member is the first journal 1311. A first guide structure is provided on the outer surface of the first journal 1311, and the first guide structure is used to enable the lubricating liquid applied to the first journal 1311 to continuously gather in the middle of the first journal 1311 when the motor is running. When the motor is running, the contact area between the rotating shaft 131 and the bearing is reduced, that is, the friction resistance between the rotating shaft 131 and the first bearing 132 is reduced, and the service life of the motor is increased.

[0031] At the same time, since the lubricating fluid gathered in the middle of the first journal 1311 forms a hydrostatic seal, when the motor works in a specific scenario, for example, when the motor is set in the body as a power source of a heart pump, the hydrostatic seal formed by the lubricating fluid can prevent blood from entering the inner cavity 11a of the motor body. By setting the guide structure, the sealing of the space is achieved, and the friction between the rotating shaft 131 and the first bearing 132 is reduced. There is no need to set an additional structure to continuously provide lubricating fluid, thereby simplifying the motor structure.

[0032] In order to allow the lubricating fluid to gather in the middle of the first journal 1311 when the motor is running, optionally, the first guide structure includes a first spiral structure and a second spiral structure, the first spiral structure and the second spiral structure are arranged in sequence along the axial direction of the first journal 1311, and the first spiral structure and the second spiral structure have opposite directions of rotation. The first spiral structure includes any one of a first spiral ridge or a first spiral groove, and the second spiral structure includes any one of a second spiral ridge or a second spiral groove.

[0033] Specifically, Figure 1 As shown, the first spiral structure includes a first spiral ridge 134, and the second spiral structure includes a second spiral ridge 133. The first spiral ridge 134 and the second spiral ridge 133 are both formed on the outer surface of the first shaft neck 1311, and the first spiral ridge 134 and the second spiral ridge 133 are arranged in sequence along the axial direction of the first shaft neck 1311; the rotation direction of the first spiral ridge 134 is opposite to that of the second spiral ridge 133.

[0034] By providing the first spiral ridge 134 and the second spiral ridge 133 with opposite rotation directions, when in use, the motor is started and the shaft 131 rotates at high speed. The first spiral ridge 134 and the second spiral ridge 133 with opposite rotation directions squeeze the lubricating liquid in the gap between the shaft 131 and the bearing hole 132a to the middle to form a liquid seal. While reducing the friction between the shaft 131 and the bearing, the squeezed lubricating liquid seals the internal space of the motor body.

[0035] It can be understood that the rotation direction of the first spiral ridge 134 and the rotation direction of the second spiral ridge 133 are related to the rotation direction of the shaft 131. Figure 1 , when viewed from right to left, the rotation direction of the rotating shaft 131 is clockwise, the rotation direction of the first spiral ridge 134 is left-handed, and the rotation direction of the second spiral ridge 133 is right-handed. When the first spiral ridge 134 and the second spiral ridge 133 rotate together with the rotating shaft 131, the lubricating liquid moves toward the direction of the second spiral ridge 133 under the drive of the first spiral ridge 134, and the lubricating liquid moves toward the direction of the first spiral ridge 134 under the drive of the second spiral ridge 133. Therefore, under the joint action of the first spiral ridge 134 and the second spiral ridge 133, the lubricating liquid moves between the first spiral ridge 134 and the second spiral ridge 133.

[0036] In an optional implementation, the first spiral ridge 134 and the second spiral ridge 133 are both formed as external threads of the first journal 1311 .

[0037] By machining two sections of external threads with opposite rotation directions on the first journal 1311, the external threads are directly machined on the surface of the shaft 131, which facilitates the standard machining of the shaft 131, and the pitch, thread profile and other parameters of the external threads of the first journal 1311 are determined according to the use environment of the motor. Preferably, the pitch of the first spiral ridge 134 is the same as the pitch of the second spiral ridge 133, so that the lubricating liquid is gathered between the first spiral ridge 134 and the second spiral ridge 133, thereby improving the sealing effect of the liquid seal.

[0038] In the present invention, there is no special limitation on the thread profile. In order to further improve the sealing effect of the liquid seal, preferably, the thread profiles of the first spiral ridge 134 and the second spiral ridge 133 are triangular or trapezoidal.

[0039] In an optional implementation, along the axial direction of the rotating shaft 131 , the lengths of the first spiral ridge 134 and the second spiral ridge 133 are the same.

[0040] By setting the lengths of the first spiral ridge 134 and the second spiral ridge 133 to be the same, the liquid seal position formed by the lubricating liquid after the rotating shaft 131 rotates is maintained at the middle position of the first journal 1311. When the motor is a micro motor, if the lengths of the first spiral ridge 134 and the second spiral ridge 133 are different, the liquid seal position is close to the inner cavity 11a of the motor body or the outside of the motor body. When the length of the first journal 1311 is short, the lubricating liquid is easy to flow into the inner cavity 11a of the motor body or outside the motor body, thereby affecting the sealing effect and lubrication effect. Therefore, the liquid seal position is maintained at the middle position of the first journal 1311, and there is no need to increase the length of the first journal 1311, thereby reducing the volume of the motor and saving the space occupied by the motor.

[0041] Optionally, the first spiral structure includes a first spiral groove 131b, and the second spiral structure includes a second spiral groove 131a. The first spiral groove 131b and the second spiral groove 131a are both formed on the outer surface of the first shaft neck 1311. The first spiral groove 131b and the second spiral groove 131a are arranged in sequence along the axial direction of the first shaft neck 1311, and the rotation directions of the first spiral groove 131b and the second spiral groove 131a are opposite.

[0042] Similarly, by providing the first spiral groove 131b and the second spiral groove 131a with opposite rotation directions, when the rotating shaft 131 rotates, the first spiral groove 131b and the second spiral groove 131a with opposite rotation directions squeeze the lubricating liquid in the gap between the rotating shaft 131 and the bearing hole 132a to the middle to form a liquid seal, while reducing the friction between the rotating shaft 131 and the bearing, the squeezed lubricating liquid seals the inner cavity 11a of the motor body.

[0043] In order to prevent the diameter of the portion between the first spiral groove 131b and the second spiral groove 131a from being larger than the diameters of both sides thereof, so that the lubricating fluid cannot be gathered between the first spiral groove 131b and the second spiral groove 131a after the rotating shaft 131 rotates, thereby affecting the sealing effect, optionally, as Figure 2 and Figure 3 As shown, the first journal 1311 shaft includes a first end 1311b, a middle portion 1311a and a second end 1311c which are connected in sequence, a first spiral groove 131b is formed on the first end 1311b, a second spiral groove 131a is formed on the second end 1311c, and a diameter of the middle portion 1311a is smaller than a diameter of the first end 1311b and a diameter of the second end 1311c.

[0044] By setting the diameter of the middle portion 1311a to be smaller than the diameter of the first end portion 1311b and the diameter of the second end portion 1311c, the lubricating liquid can be concentrated in the middle portion 1311a and form a liquid seal. It can be understood that the minimum diameter of the middle portion 1311a is smaller than the minimum diameter of the first end portion 1311b and the minimum diameter of the second end portion 1311c, wherein the minimum diameter of the first end portion 1311b is the diameter at the first spiral groove 131b, and the minimum diameter of the second end portion 1311c is the diameter at the second spiral groove 131a.

[0045] As an optional implementation, the surface of the middle portion 1311a is a concave curved surface.

[0046] It can be understood that the first spiral structure includes any one of the first spiral ridge and the first spiral groove, and the second spiral structure includes any one of the second spiral ridge and the second spiral groove. The specific forms of the first spiral structure and the second spiral structure can be arbitrarily combined. In addition to the above-mentioned case where the first spiral structure is the first spiral ridge and the second spiral structure is the second spiral ridge, and the first spiral structure is the first spiral groove and the second spiral structure is the second spiral groove, it also includes the case where the first spiral structure is the first spiral ridge and the second spiral structure is the second spiral groove, and the first spiral structure is the first spiral groove and the second spiral structure is the second spiral ridge. The working principle is the same as the specific combination of the first spiral structure and the second spiral structure described above, and will not be repeated here.

[0047] In order to improve the rotation stability of the rotating shaft 131, in an optional implementation, as Figure 1 and Figure 4 As shown, the motor shaft assembly also includes a second bearing 135, and the second journal 136 of the rotating shaft 131 is arranged in the second bearing 135, and the second bearing 135 is arranged in the inner cavity 11a of the motor body. The first journal 1311 and the second journal 136 are respectively located at both ends of the rotating shaft 131, and a second guide structure is formed on the second journal 136, and the second guide structure is used to guide the lubricating liquid to gather in the middle part of the second journal 136.

[0048] By providing the second bearing 135 and the second guide structure, both ends of the rotating shaft 131 can cooperate with the bearings, thereby improving the stability of the rotating shaft 131 during rotation and the sealing of the internal space of the motor.

[0049] Alternatively, if Figure 5As shown, the second guide structure includes a third spiral structure and a fourth spiral structure, the third spiral structure and the fourth spiral structure are sequentially arranged along the axial direction of the first journal, and the third spiral structure and the fourth spiral structure have opposite rotation directions. Specifically, the third spiral structure includes a third spiral groove 131d, and the fourth spiral structure includes a fourth spiral groove 131e. The third spiral groove 131d and the fourth spiral groove 131e are both formed on the outer surface of the second journal 136, the third spiral groove 131d and the fourth spiral groove 131e are sequentially arranged along the axial direction of the second journal 136, and the third spiral groove 131d and the fourth spiral groove 131e have opposite rotation directions.

[0050] Among them, the third spiral groove 131d has the same rotation direction as the first spiral groove 131b, and the fourth spiral groove 131e has the same rotation direction as the second spiral groove 131a. By arranging the third spiral groove 131d and the fourth spiral groove 131e with opposite rotation directions on the second shaft neck 136, the lubricating liquid also forms a liquid seal at the second shaft neck 136, thereby reducing the friction between the rotating shaft 131 and the second bearing 135, improving the rotation stability of the rotating shaft 131, and at the same time, preventing external liquid or impurities from entering the internal space of the motor body, further improving the overall sealing inside the motor.

[0051] In an optional embodiment, the third spiral structure includes a third spiral ridge (not shown in the figure), and the fourth spiral structure includes a fourth spiral ridge. The third spiral ridge and the fourth spiral ridge are both formed on the outer surface of the second journal 136, and the third spiral ridge and the fourth spiral ridge are arranged in sequence along the axial direction of the second journal 136; the rotation direction of the third spiral ridge is opposite to the rotation direction of the fourth spiral ridge. It can be understood that the specific forms of the first guide structure and the second guide can be arbitrarily combined, including but not limited to when the first guide structure is set as the first spiral ridge 134 and the second spiral ridge 133, the second guide structure is set as the third spiral ridge and the fourth spiral ridge, or is set as the third spiral groove 131d and the fourth spiral groove 131e; and when the first guide structure is set as the first spiral groove 131b and the second spiral groove 131a, the second guide structure is set as the third spiral ridge and the fourth spiral ridge, or is set as the third spiral groove 131d and the fourth spiral groove 131e.

[0052] The working mechanism of the third spiral ridge and the fourth spiral ridge is consistent with the working mechanism of the first spiral ridge and the second spiral ridge mentioned above, and both can improve the sealing of the internal space of the motor and reduce the friction between the bearing and the rotating shaft, which will not be repeated here.

[0053] The utility model also provides a heart pump including the above-mentioned motor. The above-mentioned motor has the advantage of long service life. By using the above-mentioned motor on the heart pump, the replacement and maintenance of the heart pump caused by the damage of the motor is reduced, and the service life of the heart pump is extended. At the same time, the above-mentioned motor can prevent blood from entering the internal space of the motor by forming a liquid seal, and avoid the motor stalling caused by blood clots entering the bearing position. In addition, dynamic sealing inside the motor can be achieved without setting up an additional flushing system to provide flushing liquid, which reduces the complexity of the heart pump and reduces the volume of the heart pump.

[0054] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention shall be included in the scope of the claims.

Claims

1. A motor, comprising a motor body and a motor shaft assembly, characterized in that: The motor shaft assembly includes a rotating shaft and a support member, wherein the support member is disposed on the motor body, and a first guiding structure is provided at a fitting position between the rotating shaft and the support member, wherein the first guiding structure is used to guide lubricating fluid to gather at the fitting position.

2. The motor according to claim 1, characterized in that The first guiding structure includes a first helical structure and a second helical structure. The first helical structure and the second helical structure are arranged in sequence along the axial direction of the rotating shaft. The first helical structure and the second helical structure have opposite rotation directions.

3. The motor according to claim 2, characterized in that The first spiral structure includes any one of a first spiral ridge or a first spiral groove, and the second spiral structure includes any one of a second spiral ridge or a second spiral groove.

4. The motor according to claim 3, characterized in that The support member includes a first bearing, an axial hole is formed on the motor body, the first bearing is arranged in the axial hole, and the first shaft neck of the rotating shaft is arranged in the bearing hole of the first bearing; the first spiral structure and the second spiral structure are formed on the first shaft neck, and the first spiral structure and the second spiral structure are arranged in sequence along the axial direction of the first shaft neck.

5. The motor according to claim 4, characterized in that The first spiral structure includes a first spiral ridge, and the second spiral structure includes a second spiral ridge, and the first spiral ridge and the second spiral ridge both protrude outward from the outer surface of the first shaft neck; or the first spiral structure includes a first spiral groove, and the second spiral structure includes a second spiral groove, and the first spiral groove and the second spiral groove are both formed on the outer surface of the first shaft neck.

6. The motor according to claim 5, characterized in that Along the axial direction of the rotating shaft, the first spiral structure is a first spiral convex strip, the second spiral structure is a second spiral convex strip, and the first spiral convex strip and the second spiral convex strip have the same length.

7. The motor according to claim 5, characterized in that The first shaft neck includes a first end, a middle part and a second end connected in sequence, the first spiral structure is a first spiral groove, the second spiral structure is a second spiral groove, the groove is formed on the first end, the second spiral groove is formed on the second end, and the diameter of the middle part is smaller than the diameter of the first end and the diameter of the second end.

8. The motor according to claim 4, characterized in that The motor shaft assembly also includes a second bearing, the second journal of the rotating shaft is arranged in the second bearing, the second bearing is arranged in the inner cavity of the motor body, the first journal and the second journal are respectively located at two ends of the rotating shaft, and a second guide structure is formed on the second journal, and the second guide structure is used to guide the lubricating liquid to gather in the middle of the second journal.

9. The motor according to claim 8, characterized in that The second guiding structure comprises a third helical structure and a fourth helical structure, wherein the third helical structure and the fourth helical structure are arranged in sequence along the axial direction of the first journal, and the third helical structure and the fourth helical structure have opposite rotation directions.

10. The motor according to claim 9, characterized in that The third spiral structure includes a third spiral ridge, and the fourth spiral structure includes a fourth spiral ridge, and both the third spiral ridge and the fourth spiral ridge protrude outward from the outer surface of the second shaft neck; or the third spiral structure includes a third spiral groove, and the fourth spiral structure includes a fourth spiral groove, and both the third spiral groove and the fourth spiral groove are formed on the outer surface of the second shaft neck.

11. A heart pump comprising a motor, characterized in that: The motor is the motor according to any one of claims 1 to 10.

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