Cutting unit, razor head, and electric razor

Abstract

The embodiment of the utility model discloses a cutting unit, a razor head and an electric razor, the cutting unit is applied to the razor, the cutting unit comprises a supporting piece with a rotating shaft and a cutting blade provided with a cutting edge, the supporting piece carries a supporting leg in the cutting blade, and the supporting leg is connected with the rotating shaft. Each cutting blade has a moving direction in the process that the cutting unit rotates around the rotating shaft; the cutting edges comprise the first cutting edge and the second cutting edge, the curvature of the first cutting edge is larger than or equal to the curvature of the second cutting edge, and the distance from the first cutting edge to the rotating shaft is larger than or equal to the distance from the second cutting edge to the rotating shaft. The curvature of the first cutting edge of the cutting edges is larger than or equal to the curvature of the second cutting edge, and the distance between the first cutting edge and the rotating shaft is larger than or equal to the distance between the second cutting edge and the rotating shaft, so that the first cutting edge can effectively gather beards, and effective cutting is carried out in combination with the second cutting edge; and the shaving efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of shavers, and in particular to a cutting unit, a shaver head and an electric shaver. Background Art

[0002] The shaving unit of an electric shaver consists of blades and a foil. The blades cut the hairs that enter the foil to achieve shaving. During shaving, beard hairs often enter the cutting area from the far end of the foil slots. Conventional shavers use straight blades and straight slots to cut hairs. When hairs enter the cutting area, they may be pushed outside the foil slots, resulting in a failed shaving, a pulling sensation, or ineffective cutting, affecting shaving efficiency. Utility Model Content

[0003] The embodiments of this specification provide a cutting unit, a shaving head and an electric shaver to solve the problem of low shaving efficiency in the prior art.

[0004] To solve the above technical problems, the embodiments of this specification are implemented as follows:

[0005] An embodiment of the present specification provides a cutting unit, which is used in a razor and includes a support member having a rotation axis and a cutting blade provided with a cutting edge, wherein the support member carries a leg of the cutting blade, and each cutting blade has a moving direction during the rotation of the cutting unit around the rotation axis;

[0006] The cutting edges include a first cutting edge and a second cutting edge, the curvature of the first cutting edge is greater than or equal to the curvature of the second cutting edge, and the distance from the first cutting edge to the rotation axis is greater than or equal to the distance from the second cutting edge to the rotation axis.

[0007] Optionally, along the moving direction of the cutting unit, the first cutting edge is arranged in front of the second cutting edge.

[0008] Optionally, the curvature range of the first cutting edge is 0-6.

[0009] Optionally, the curvature range of the second cutting edge is 0-2.

[0010] Optionally, the curvature of the first cutting edge is different from the curvature of the second cutting edge; and / or, the first cutting edge and the second cutting edge are arranged asymmetrically.

[0011] Optionally, the ratio of the projected length of the first cutting edge on the horizontal plane to the projected length of the second cutting edge on the horizontal plane is 0.618+K, where -0.2≤K≤0.2.

[0012] Optionally, the cutting insert has a plurality of first cutting blades, and the plurality of first cutting blades are arranged on the support member at intervals along the circumference of the support member.

[0013] Optionally, the cutting blade further has a plurality of second cutting blades, which are arranged on the support member at intervals along the circumference of the support member; wherein the second cutting blades are located on a side of the first cutting blade close to the rotation axis.

[0014] A razor head provided in an embodiment of the present specification includes a blade net for use with a razor and the cutting unit described above; wherein the blade net includes an annular shaving track arranged concentrically around the rotation axis so as to cooperate with the cutting edge of the cutting unit; the annular shaving track is provided with an inner circumferential side surface and an outer circumferential side surface and a hair feed groove having a front edge and a rear edge when viewed along the moving direction of the cutting unit, and wherein the hair feed groove extends on at least one of the circumferential side surfaces.

[0015] Optionally, the whisker inlet groove is S-shaped, V-shaped, U-shaped or bracket-shaped.

[0016] An electric shaver provided in an embodiment of the present specification comprises a handheld portion and the above-mentioned shaver head; wherein the shaver head is arranged on the handheld portion.

[0017] One embodiment of this specification achieves the following beneficial effects:

[0018] The cutting unit, shaver head and electric shaver of the embodiments of this specification are configured such that the curvature of the first cutting edge of the cutting edge is greater than or equal to the curvature of the second cutting edge, and the distance from the first cutting edge to the rotation axis is greater than or equal to the distance from the second cutting edge to the rotation axis, so that the first cutting edge can more effectively gather the beard and can effectively cut in combination with the second cutting edge, thereby avoiding the beard being pushed outside the blade mesh slot, thereby improving shaving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic structural diagram of a cutting blade provided in an embodiment of this specification;

[0021] Figure 2A schematic diagram of the structure of a knife net provided in an embodiment of this specification;

[0022] Figure 3 A schematic structural diagram of a cutting unit provided in an embodiment of this specification;

[0023] Figure 4 A front view of a cutting unit provided in an embodiment of this specification;

[0024] Figure 5 A top view of a cutting unit provided in an embodiment of this specification;

[0025] Figure 6 Provided for the embodiments of this specification Figure 5 A partial enlarged view of point A in the middle;

[0026] Figure 7 A top view of a cutting unit provided in an embodiment of this specification;

[0027] Figure 8 Provided for the embodiments of this specification Figure 7 A partial enlarged view of point B in the middle;

[0028] Figure 9 A schematic diagram of a shape comparison of a cutting edge provided in an embodiment of this specification;

[0029] Figure 10 A schematic diagram of the projected length of the cutting edge provided in the embodiments of this specification;

[0030] Figure 11 A schematic diagram of the structure of a razor head provided in an embodiment of this specification;

[0031] Figure 12 A top view of a razor head provided in an embodiment of this specification;

[0032] Figure 13 A schematic cross-sectional view of a razor head provided in an embodiment of this specification;

[0033] Figure 14 A schematic diagram of the structure of a knife net provided in an embodiment of this specification;

[0034] Figure 15 A schematic diagram of the structure of a razor head with an S-shaped hair feed groove provided in an embodiment of this specification;

[0035] Figure 16 Provided for the embodiments of this specification Figure 15 A partial enlarged view of point C in the middle;

[0036] Figure 17 A schematic structural diagram of a bracket-shaped whisker inlet groove provided in an embodiment of this specification;

[0037] Figure 18 This is a schematic structural diagram of an electric shaver provided in an embodiment of this specification.

[0038] Reference numerals:

[0039] 1. Straight-edge cutting blade; 2. Straight-groove knife net; 3. Cutting unit; 31. Support member; 32. Cutting blade; 321. First cutting edge; 322. Second cutting edge; 33. Support leg; 34. Fixed seat; 4. Knife net; 41. Annular shaving track; 411. Inner circumferential side surface; 412. Outer circumferential side surface; 413. Shaving feed groove; 414. Strip bone position; 415. Bone position body; 416. First fixed foot; 417. Second fixed foot; 42. Knife net edge; 5. Shaving head; 51. Knife head housing; 6. Handle part. DETAILED DESCRIPTION

[0040] To make the purpose, technical solutions, and advantages of one or more embodiments of this specification more clear, the technical solutions of one or more embodiments of this specification will be clearly and completely described below in conjunction with the specific embodiments of this specification and the corresponding drawings. Obviously, the embodiments described are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of one or more embodiments of this specification.

[0041] The technical solutions provided by the embodiments of this specification are described in detail below with reference to the accompanying drawings.

[0042] The razor usually shaves by cutting the beard that enters the knife net through the cutting blade. In actual application, the razor usually uses a straight-edge cutting blade and a straight-groove knife net. Figure 1 This is a schematic diagram of the structure of a cutting blade provided in an embodiment of this specification. Figure 2 This is a schematic diagram of the structure of a knife net provided in the embodiment of this specification, see Figure 1 It can be seen that the cutting blade of the razor is a straight-edge cutting blade 1, see Figure 2 You can see that the shaver's blade mesh is a straight-grooved blade mesh 2. Under the action of the straight-edge cutting blade and the straight-grooved blade mesh, beards may be pushed outside the blade mesh groove when entering the cutting area of ​​the shaver. When the user uses the shaver to shave back and forth, it will cause a pulling sensation on the beards, affecting shaving efficiency.

[0043] In order to solve the defects in the prior art, this solution provides the following embodiments:

[0044] Figure 3 This is a structural diagram of a cutting unit provided in an embodiment of this specification. Figure 4 This is a front view of a cutting unit provided in an embodiment of this specification. Figure 3-Figure 4 As shown, the cutting unit 3 of the embodiment of this specification is applied to a razor. The cutting unit 3 may include a support member 31 having a rotation axis Z and a cutting blade 32 provided with a cutting edge. The support member 31 is used to support the support legs 33 in the cutting blade 32. During the rotation of the cutting unit 3 around the rotation axis Z, each cutting blade 32 has a moving direction.

[0045] Figure 5 This is a top view of a cutting unit provided in an embodiment of this specification. Figure 5 As shown, the cutting unit 3 of the embodiment of this specification may further include a fixing seat 34 coaxially arranged with the support member 31. The fixing seat 34 may be used to couple with an external drive shaft. The external drive shaft may drive the cutting unit 3 to rotate by driving the fixing seat 34.

[0046] Figure 6 Provided for the embodiments of this specification Figure 5 A partial enlarged view of the middle A. Figure 6 As shown, the cutting edge of the cutting blade 32 includes a first cutting edge 321 and a second cutting edge 322, and the curvature of the first cutting edge 321 can be greater than or equal to the curvature of the second cutting edge 322. Figure 3 In the embodiment of this specification, the distance from the first cutting edge 321 to the rotation axis Z may be greater than or equal to the distance from the second cutting edge 322 to the rotation axis Z.

[0047] In the embodiment of this specification, the curvature of the first cutting edge 321 is set to be greater than or equal to the curvature of the second cutting edge 322, and the distance from the first cutting edge 321 to the rotation axis Z is greater than or equal to the distance from the second cutting edge 322 to the rotation axis Z. This allows beard hairs to be gathered by the first cutting edge 321 after entering the cutting area, thereby preventing them from being pushed outside the beard inlet slot of the blade net. This eliminates the feeling of beard being pulled when the user shaves back and forth with the razor, thereby improving the user's shaving experience. Furthermore, after the first cutting edge 321 gathers the beard hairs, it combines with the second cutting edge 322 to effectively cut the hairs, resulting in higher shaving efficiency.

[0048] In a specific embodiment, the cutting edge of the cutting blade 32 may have a protrusion protruding in the opposite direction of the moving direction of the cutting unit 3. Due to the presence of the protrusion, the cutting edge of the cutting blade 32 can also gather the beard, avoid the beard pulling feeling and improve the shaving efficiency.

[0049] Specifically, the first cutting edge 321 and the second cutting edge 322 of the cutting edge may both be straight-line cutting edges, and the straight-line first cutting edge 321 and the straight-line second cutting edge 322 may form a preset angle with each other.

[0050] Figure 7 This is a bottom view of a cutting unit provided in an embodiment of this specification. Figure 8 Provided for the embodiments of this specification Figure 7 A partial enlarged view of point B in the figure. Figure 7-Figure 8 As shown, the first cutting edge 321 and the second cutting edge 322 may both be straight cutting edges.

[0051] It can be understood that one of the first cutting edge 321 and the second cutting edge 322 can be a curved cutting edge, and the other can be a straight cutting edge, and the secant line passing through the starting point and the end point of the curve of the curved cutting edge forms a preset angle with the straight line of the straight cutting edge; or, the first cutting edge 321 and the second cutting edge 322 are both curved cutting edges, for example, the first cutting edge 321 is a first curved cutting edge, and the second cutting edge 322 is a second curved cutting edge, then the secant line passing through the starting point and the end point of the curve of the first curved cutting edge can form a preset angle with the secant line passing through the starting point and the end point of the curve of the second curved cutting edge.

[0052] In the embodiment of this specification, the preset angle may be an angle greater than zero.

[0053] In order to further improve the beard gathering effect of the first cutting edge 321 , in the embodiment of this specification, along the moving direction of the cutting unit 3 , the first cutting edge 321 of any cutting blade 32 can be arranged in front of the second cutting edge 322 of any cutting blade 32 .

[0054] Figure 9 This is a schematic diagram of the shape comparison of a cutting edge provided in the embodiment of this specification. Figure 9In the figure, a is a straight cutting edge, b is a barbed cutting edge, c is a bracket-shaped cutting edge, and d is a sickle-shaped cutting edge. The straight cutting edge a is the cutting edge used in actual applications. The straight cutting edge a as a whole can be used to cut beards, and the effective cutting area is large. However, since the straight cutting edge a is straight, it has no beard-gathering effect, and beards are easily pushed outside the straight cutting edge a, resulting in low shaving efficiency. For the barbed cutting edge b, although the first cutting edge of the barbed cutting edge b has a beard-gathering effect, since the first cutting edge of the barbed cutting edge b is not responsible for beard cutting, the effective cutting area is small, and thus the shaving efficiency is low. For the bracket-shaped cutting edge c, the bracket-shaped cutting edge c as a whole can have a beard-gathering effect, but when beards gather, they gather to the middle of the bracket-shaped cutting edge c. In this way, the effective cutting area is only the middle of the bracket-shaped cutting edge c, and the effective cutting area is also small, and thus the shaving efficiency is low.

[0055] To enhance the hair-gathering effect of the straight cutting edge a and avoid the limited effective cutting area of ​​the barbed cutting edge b and the bracketed cutting edge c, the present embodiment incorporates a sickle-shaped cutting edge d. The curvature of the first cutting edge of the sickle-shaped cutting edge d can range from 0 to 6. The curvature of the second cutting edge of the sickle-shaped cutting edge d can range from 0 to 2. Within this curvature range, the first cutting edge of the sickle-shaped cutting edge d not only achieves a hair-gathering effect, but the second cutting edge of the sickle-shaped cutting edge d also has a larger effective cutting area, resulting in higher shaving efficiency.

[0056] In the embodiment of this specification, the curvature range of the first cutting edge of the sickle-shaped cutting edge d is 0-6, specifically [0mm -1 , 6mm -1 The curvature range of the second cutting edge of the sickle-shaped cutting edge d is 0~2, specifically [0mm -1 , 2mm -1 ]. Preferably, the first cutting edge and / or the second cutting edge is a curve, that is, the curvature range of the first cutting edge is (0mm -1 , 6mm -1 ], and / or the curvature range of the second cutting edge is (0mm -1 , 2mm -1 ].

[0057] In order to improve the gathering effect of the cutting edges and the shaving efficiency, the curvature of the first cutting edge 321 is different from the curvature of the second cutting edge 322; and / or the first cutting edge 321 and the second cutting edge 322 are arranged asymmetrically.

[0058] Furthermore, if the horizontal projection length of the first cutting edge 321 is larger and the horizontal projection length of the second cutting edge 322 is smaller, the effective cutting area of ​​the second cutting edge 322 will be smaller, affecting shaving efficiency. Conversely, if the horizontal projection length of the first cutting edge 321 is smaller and the horizontal projection length of the second cutting edge 322 is larger, the hair-gathering effect of the first cutting edge 321 will be poor, affecting shaving efficiency. Therefore, in order to increase the effective cutting area while achieving the hair-gathering effect and improve shaving efficiency, the ratio of the horizontal projection length of the first cutting edge 321 to the horizontal projection length of the second cutting edge 322 in the embodiment of this specification is a preset value.

[0059] Figure 10 Schematic diagram of the projected length of the cutting edge provided in the embodiment of this specification. Figure 10 As shown, the projection length of the first cutting edge 321 on the horizontal plane may be S1, the projection length of the second cutting edge 322 on the horizontal plane may be S2, and the preset value, that is, S1 / S2, may be 0.618+K, wherein -0.2≤K≤0.2.

[0060] In the embodiment of this specification, in order to improve the shaving efficiency of the cutting unit 3 , the cutting blade 32 may be provided with a plurality of first cutting blades, and the plurality of first cutting blades are arranged on the support member 31 at intervals along the circumference of the support member 31 .

[0061] To further improve the shaving efficiency of the cutting unit 3, the cutting blade 32 may further include a plurality of second cutters, which are spaced apart along the circumference of the support 31. The second cutters may be located on a side of the first cutter close to the rotation axis Z.

[0062] Based on the same idea, the embodiments of this specification also provide a razor head.

[0063] Figure 11 This is a schematic structural diagram of a razor head provided in an embodiment of this specification. Figure 12 This is a top view of a razor head provided in an embodiment of this specification. Figure 13 This is a cross-sectional diagram of a razor head provided in an embodiment of this specification. Figure 11-13 As shown, the razor head of the embodiment of this specification may include a blade net 4 applied to a razor and the above-mentioned cutting unit 3, and the blade net 4 may be covered on the cutting unit 3. The blade net 4 may include an annular shaving track 41 arranged concentrically around the rotation axis Z so as to cooperate with the cutting edge of the cutting unit 3.

[0064] The annular shaving track 41 has an inner circumferential surface 411 and an outer circumferential surface 412. The inner circumferential surface 411 may be the side of the annular shaving track 41 closer to the rotation axis Z of the support 31. The outer circumferential surface 412 may be the side of the annular shaving track 41 farther from the rotation axis Z of the support 31. The annular shaving track 41 also has a hair feed groove 413 having a front edge and a rear edge when viewed in the direction of movement of the cutting unit 3. The hair feed groove 413 extends on at least one of the inner circumferential surface 411 and the outer circumferential surface 412.

[0065] Furthermore, the annular shaving track 41 may include a plurality of bar-shaped bone positions 414 , and the hair feeding grooves 413 may be provided between adjacent bar-shaped bone positions 414 .

[0066] In the embodiment of this specification, the cutting edge of the cutting blade 32 can abut against the inner circumferential side surface 411 of the annular shaving track 41. When the shaver head is in use, the fixing base 34 of the cutting unit 3 can be coupled to the external drive shaft to drive the cutting unit 3 to rotate along the annular shaving track 41. The beard can enter the blade net 4 through the beard inlet groove 413 and be cut by the cutting blade 32 in the blade net 4.

[0067] In practice, the strip-shaped bone is positioned between the outer and inner circumferential surfaces of the circular shaving track. One end of the strip-shaped bone connects to the outer circumferential top of the circular shaving track, while the other end connects to the inner circumferential top of the circular shaving track. This prevents hair from entering the blade from the outer and inner circumferential surfaces and is easily blocked by the ends of the strip-shaped bone, affecting shaving efficiency.

[0068] Figure 14 This is a schematic diagram of the structure of a knife net provided in the embodiment of this specification. Figure 14 As shown, in this embodiment of the present specification, the strip-shaped bone section 414 may include a bone section body 415 and first and second fixing legs 416 and 417 located on either side of the bone section body. The first fixing legs 416 may be provided on the outer circumferential side surface 412, and the second fixing legs 417 may be provided on the inner circumferential side surface 411. Furthermore, the strip-shaped bone section 414 does not block beard hair from entering the blade net 4, making it easier for beard hair to enter the blade net 4 and be cut, thereby improving shaving efficiency.

[0069] In order to improve the beard gathering effect and further enhance the shaving efficiency, in the embodiment of this specification, the beard feeding groove 413 of the blade net 4 may have a protrusion protruding along the moving direction of the cutting unit 3. The protrusion of the beard feeding groove 413 may cooperate with the cutting edge of the cutting blade 32 to gather the beard, thereby improving the beard gathering effect.

[0070] Specifically, Figure 15This is a schematic diagram of the structure of a razor head with an S-shaped hair feed groove provided in an embodiment of this specification. Figure 16 Provided for the embodiments of this specification Figure 15 A partial enlarged view of point C in the middle. Figure 15-16 As shown, the beard feeding groove 413 of the embodiment of this specification can be specifically S-shaped. A knife net edge 42 can be provided on both sides of the beard feeding groove 413. After the beard enters the knife net 4, it can be cut by the cutting blade 32 and the knife net edge 42.

[0071] Figure 17 This is a schematic diagram of the structure of a bracket-shaped whisker feeding groove provided in the embodiment of this specification. Figure 17 In this embodiment, if the cutting blade 32 has a plurality of first cutting blades and a plurality of second cutting blades, the blade net 4 may also have a hair feed groove 413 for shaving with the first cutting blade and the second cutting blade respectively.

[0072] Furthermore, the whisker inlet groove 413 of the embodiment of this specification can also be U-shaped, or as shown in FIG. Figure 12 Shapes such as the V-shape shown.

[0073] It is understandable that the whisker feeding groove 413 may also have other shapes, which are not specifically limited here.

[0074] Based on the same idea, an electric shaver is also provided in the embodiments of this specification.

[0075] Figure 18 This is a schematic diagram of the structure of an electric shaver provided in the embodiment of this specification. Figure 18 As shown, the electric shaver of the embodiment of this specification includes a handheld portion 6 and the above-mentioned shaving head 5. The shaving head 5 can be arranged on the handheld portion 6.

[0076] In the embodiment of this specification, the shaving head 5 can be installed on the head housing 51 , and then the shaving head 5 can be set on the handheld part 6 through the head housing 51 .

[0077] In the embodiment of this specification, in order to save industrial costs, a shaving head 5 can be provided on the head housing 51 .

[0078] In order to improve the shaving efficiency, a plurality of shaving heads 5 can be provided on the cutter head housing 51. For example, 2, 3 or 5 shaving heads 5 can be provided, which is not limited here.

[0079] For ease of description, spatially relative terms such as "above," "above," "on the upper surface of," and "upper" may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "on top of" other devices or structures would then be positioned as "below" or "beneath" the other devices or structures. Thus, the exemplary term "above" can include both the "above" and "below" orientations. The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used herein should be interpreted accordingly.

[0080] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0081] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0082] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A cutting unit, characterized in that: The cutting unit is applied to a shaver and comprises a support having a rotation axis and cutting blades provided with cutting edges, wherein the support carries legs of the cutting blades, and each of the cutting blades has a direction of movement during the rotation of the cutting unit about the rotation axis; The cutting edges include a first cutting edge and a second cutting edge, the curvature of the first cutting edge is greater than or equal to the curvature of the second cutting edge, and the distance from the first cutting edge to the rotation axis is greater than or equal to the distance from the second cutting edge to the rotation axis.

2. The cutting unit according to claim 1, wherein: Along the direction in which the cutting unit moves, the first cutting edge is arranged in front of the second cutting edge.

3. The cutting unit according to claim 1, wherein: The curvature of the first cutting edge ranges from 0 to 6.

4. The cutting unit according to claim 1, wherein: The curvature of the second cutting edge ranges from 0 to 2.

5. The cutting unit according to claim 1, wherein: The curvature of the first cutting edge is different from the curvature of the second cutting edge; and / or the first cutting edge and the second cutting edge are arranged asymmetrically.

6. The cutting unit according to any one of claims 1 to 5, characterized in that: The ratio of the projected length of the first cutting edge on the horizontal plane to the projected length of the second cutting edge on the horizontal plane is 0.618+K, wherein -0.2≤K≤0.

2.

7. The cutting unit according to claim 1, wherein: The cutting insert has a plurality of first cutting blades, and the plurality of first cutting blades are arranged on the support member at intervals along the circumference of the support member.

8. The cutting unit according to claim 7, wherein: The cutting insert further comprises a plurality of second cutting blades, which are arranged on the support member at intervals along the circumference of the support member; wherein the second cutting blades are located on a side of the first cutting blade close to the rotation axis.

9. A razor head, characterized in that: It comprises a blade net for use in a razor and a cutting unit according to any one of claims 1 to 8; wherein the blade net comprises an annular shaving track arranged concentrically around the rotation axis so as to cooperate with the cutting edge of the cutting unit; the annular shaving track is provided with an inner circumferential side surface and an outer circumferential side surface and a hair feed groove having a front edge and a rear edge when viewed along the moving direction of the cutting unit, and wherein the hair feed groove extends on at least one of the circumferential side surfaces.

10. The shaving head according to claim 9, wherein The hair feeding groove is S-shaped, V-shaped or U-shaped.

11. An electric shaver, characterized in that: The invention comprises a handheld portion and a shaving head according to claim 9 or 10; wherein the shaving head is arranged on the handheld portion.

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