Shell of electric tool and electric scissors

Abstract

The utility model discloses a shell of an electric tool, which is characterized in that the shell comprises a holding part and a supporting part, and a mounting space for placing a motor is formed in the holding part; the supporting part protrudes out of the inner wall of the holding part and comprises a plurality of protrusions arranged in the axial direction of the inner wall of the holding part, a gap is formed between every two adjacent protrusions, and when a motor is placed in the installation space, the motor makes contact with the surfaces of the protrusions. According to the utility model, the plurality of bulges are arranged on the inner wall of the holding part of the shell, so that multi-point contact is formed between the holding part and the motor, the contact area between the holding part and the motor is reduced under the condition of fixing the motor, the heat transfer is reduced, the temperature rise of the holding part is reduced, and the influence on the hand holding of a user is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of power tools, and particularly relates to a housing of a power tool and an electric scissors. Background Art

[0002] When designing many handheld power tools (such as electric scissors), the motor is placed at the handheld position of the tool. During use, the motor generates heat, which affects the operation of the user. To reduce the temperature rise, the heat generation can be reduced by increasing the volume and power of the motor. However, limited by the volume of the tool itself, a cooling fan cannot be installed at the position of the tool motor. If a large-volume motor is used, the tool may need to be redesigned, resulting in a significant increase in cost. The information disclosed in this background art section is only intended to enhance the overall understanding of the present utility model and should not be regarded as an admission or any form of suggestion that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Utility Model

[0003] The purpose of the present utility model is to provide a housing of a power tool, which can slow down heat transfer and reduce heat conduction without changing the original design of the tool, so as to reduce the impact of temperature rise on the user's handhold.

[0004] To achieve the above purpose, a specific embodiment of the present utility model provides a housing of a power tool, which is characterized in that it includes a holding part and a supporting part. The holding part has an installation space formed inside for placing a motor; the supporting part protrudes from the inner wall of the holding part and includes a plurality of protrusions arranged circumferentially along the inner wall of the holding part. There is a gap between adjacent protrusions. When a motor is placed in the installation space, the motor contacts the surface of the protrusions.

[0005] In one or more embodiments of the present utility model, the supporting part further includes supporting ribs protruding from the inner wall of the holding part, and the protrusions protrude from the supporting ribs. The supporting ribs and the protrusions form an annular supporting member for supporting the motor.

[0006] In one or more embodiments of the present utility model, the distance from the protrusion to the surface of the supporting rib is greater than the distance from the top surface of the supporting rib to the inner wall of the holding part.

[0007] In one or more embodiments of the present utility model, the protrusions are evenly distributed on the supporting ribs.

[0008] In one or more embodiments of the present utility model, at least two groups of the above-mentioned annular supporting members are provided on the inner wall of the holding part.

[0009] In one or more embodiments of the present utility model, the sum of the top areas of the protrusions on the supporting rib is 1 / 4 to 1 / 2 of the top area of the supporting rib.

[0010] In one or more embodiments of the present utility model, the distance between the top of the protrusion and the inner wall of the holding portion is 1.5 - 6 mm.

[0011] In one or more embodiments of the present utility model, the protrusions are evenly distributed on the inner wall of the holding portion in the installation space.

[0012] The present utility model also provides an electric scissors, which includes the housing, motor, blade, transmission mechanism and battery as described above. The motor is arranged in the installation space and supported by the protrusions. The blade is connected to one end of the housing. The motor provides power to the transmission mechanism. The transmission mechanism is installed in the housing and connects and drives the guide plates to approach or move away from each other. The battery is detachably installed at the other end of the housing and supplies energy to the motor.

[0013] In one or more embodiments of the present utility model, no fan is provided in the installation space.

[0014] Compared with the prior art, the housing of the electric tool of the present utility model is provided with a plurality of protrusions on the inner wall of the holding portion, so that multiple-point contact is formed between the holding portion and the motor. While fixing the motor, the contact area between the holding portion and the motor is reduced, heat transfer is reduced, the temperature rise of the holding portion is reduced, and thus the influence on the user's hand-held is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 Schematic diagram of the housing of an electric tool in an embodiment of the present utility model;

[0017] Figure 2 For Figure 1 Partial enlarged view;

[0018] Figure 3 Partial schematic diagram of an electric scissors in an embodiment of the present utility model;

[0019] Figure 4 For Figure 3 Partial enlarged view;

[0020] Figure 5 Schematic diagram of an electric scissors in an embodiment of the present utility model.

[0021] Description of Main Reference Numerals:

[0022] 100 - Electric scissors, 10 - Housing, 11 - Holding portion, 20 - Support portion, 21 - Protrusion, 22 - Gap, 23 - Support rib, 30 - Motor, 40 - Blade, 50 - Battery. Detailed Embodiment

[0023] In order to enable those skilled in the art to better understand the technical solutions in the present utility model, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0024] As Figure 1-2 shown, the housing 10 of the power tool in an embodiment of the present utility model is mainly applied to handheld power tools such as electric scissors, and includes a holding portion 11 and a support portion 20. The holding portion 11 is the position where the user holds the tool, and an installation space for placing the motor is formed inside it. The support portion 20 protrudes from the inner wall of the holding portion 11 and includes a plurality of protrusions 21 arranged circumferentially along the inner wall of the holding portion 11 for supporting the motor in the circumferential direction. A gap 22 is formed between adjacent protrusions 21. In the power tool using this housing 10, the motor is fixed in the installation space of the holding portion 11 and contacts the surface of the protrusion 21, rather than directly contacting the inner wall of the holding portion 11.

[0025] Limited by its own volume, handheld power tools generally cannot be equipped with a cooling fan for the motor. If the motor directly contacts the tool housing or the contact area is large, a large amount of heat from the motor will be transferred to the tool housing, resulting in too high a temperature rise of the housing and affecting the user's hand holding. Therefore, in this embodiment, the housing 10 is divided into two detachable and fixed parts, Figure 1 the middle housing 10 is one of the parts, and on the corresponding position of the holding portion of the other housing, there are also provided the same as Figure 1 and 2The same supporting part 20. When the two parts of the outer shell 10 are fixed, the supporting parts 20 on both sides form a supporting structure for supporting the motor. The motor is in direct contact with the protrusions 21 and is separated from the outer shell 10. Therefore, the protrusions 21 reduce the contact area with the motor, slow down the heat transfer from the motor to the outer shell 10, and part of the heat diffuses through the gap 22 between the protrusions 21. As a result, the temperature rise at the position of the holding part 11 is reduced, and the temperature of the holding part 11 will not rise too high after long-term use, which will not affect touching, picking up or holding, thus improving the user experience. Secondly, multiple protrusions 21 can provide sufficient support for the motor to prevent displacement and other situations.

[0026] In one embodiment, the supporting part 20 further includes a supporting rib 23 protruding from the inner wall of the holding part 11, and the protrusion 21 protrudes from the supporting rib 23. As Figure 2 shown, since the protrusion 21 protrudes from the supporting rib 23, the supporting rib 23 defines the setting position of the protrusion 21. The protrusion 21 surrounds one circumference of the motor, and the supporting rib 23 and the protrusion 21 form an annular supporting member for supporting the motor. The supporting rib 23 can reduce the height of the protrusion 21 while ensuring the total height of the protrusion 21, thus improving the strength of the protrusion 21 and avoiding the situation of the protrusion 21 breaking. Secondly, the protrusion 21 keeps the total heat conduction amount unchanged, but the setting of the supporting rib 23 makes the heat transfer from the motor to the holding part 11 change from a point heat source to an annular line heat source when the heat is transferred to the holding part 11. After the heat is first transferred to the supporting rib 23 and then transferred from the supporting rib 23 to the holding part 11, the heat conduction area on the holding part 11 becomes larger, and the local temperature rise on the holding part 11 is further reduced.

[0027] Furthermore, the protrusion 21 is set such that the distance from its top surface to the surface of the supporting rib 23 is greater than the distance from the top surface of the supporting rib 23 to the inner wall of the holding part 11. In the case of setting the supporting rib 23 and keeping the total height unchanged, the relatively higher protrusion 21 has slower heat transfer and less heat conduction compared with the relatively lower setting method.

[0028] Preferably, the protrusions 21 are evenly distributed on the supporting rib 23, so that the heat transfer points are evenly distributed on the supporting rib 23, and the temperatures at all parts of the supporting rib 23 are the same. Furthermore, the temperatures at all positions of the holding part 11 at the supporting rib 23 are also basically the same, and there is no temperature singularity point, thus improving the use effect of the user.

[0029] In one embodiment, two sets of annular supporting members composed of the supporting member 23 and the protrusion 21 are arranged on the holding part 11 (of course, more sets can also be arranged) to increase the supporting points of the motor and improve the stability of the support for the motor.

[0030] Furthermore, the protrusion 21 is arranged such that its top surface fits against the outer wall surface of the motor, enabling the top surface of the protrusion 21 to be in full contact with the motor surface, thus avoiding overly sharp contact points. After long-term use, the protrusion 21 will not be worn smooth, and the contact position will not shift towards the holding part 11, preventing insufficient support for the motor, wobbling, and abnormal noises.

[0031] According to the formula for calculating the heat conduction rate Φ=-λA(dt / dx) (where Φ is the heat transfer amount, λ is the thermal conductivity coefficient; A is the heat transfer area, t is the temperature, and (dt / dx) is the temperature change rate), the heat transfer amount is proportional to the heat conduction area. When the heat conduction area is reduced, the heat transfer amount decreases proportionally. Therefore, in one embodiment, the sum of the top surface areas of all the protrusions 21 on one of the support ribs 23 accounts for 1 / 4 - 1 / 2 of the sum of the top surface areas of the support rib 23, reducing the conducted heat to about 1 / 4 - 1 / 2, thereby effectively reducing the heat transfer amount and the temperature rise of the holding part 11.

[0032] Furthermore, the total height of the protrusion 21 (the distance from the top surface to the inner wall of the holding part 11) is controlled within 1.5 - 6 mm. Since the cross-sectional area of the protrusion 21 is small and the heat conduction is slow, increasing the total height of the protrusion 21 can further reduce the heat conduction. Secondly, while curbing the heat conduction of the motor, the relatively high protrusion 21 can ensure the shape of the holding part 11 to provide a good holding feeling and enhance the user experience.

[0033] In the above embodiment, the protrusion 21 is arranged on the support rib 23, and the protrusion 21 is limited within the range of the annular support rib 23, so its position is limited. In other embodiments, the support rib 23 may not be provided, and the protrusions 21 may be evenly distributed on the inner wall of the holding part 11. At this time, the position of the protrusion 21 is no longer restricted by the support rib 23 but is evenly distributed within the installation space for fixing the motor. Such an arrangement enables the positions where the heat is transferred to the holding part 11 to be distributed on the entire holding part 11 rather than a certain annular area. Therefore, the holding part 11 is heated as a whole rather than locally, improving the overall user experience.

[0034] As Figures 3-5 shown, the present application also provides an electric scissors 100, including a motor 30 and the above-mentioned housing 10. This electric scissors is a handheld power tool, the holding part 11 is the position where the user grips, the motor 30 is fixed within the installation space inside the holding part 11 and is supported by the protrusions 21.

[0035] The electric scissors 100 further includes a blade 40, a transmission mechanism (not shown in the figure), and a battery 50. The blade 40 is rotatably disposed at one end of the housing 10. The transmission mechanism is disposed inside the housing 10, connected to the motor 30 and powered by the motor 30. The battery 50 is detachably mounted at the other end of the housing 10 for supplying energy to the motor 30. Limited by its own volume, the electric scissors 100 cannot install a cooling fan for the motor 30. Therefore, the housing 10 with the support portion 20 is adopted, and the heat transfer from the motor 30 to the holding portion 11 is slowed down, and the heat conduction amount is reduced, thereby reducing the influence of the temperature rise on the user's hand-held.

[0036] The electric scissors 100 is a hand-held tool. To ensure portability, its volume is small. After the motor 30 is fixed at the position of the hand-held portion 11, it is supported by the protrusion 21. The protrusion 21 separates the motor 30 from the housing 10, slows down the heat transfer to the housing 10, and further slows down the temperature rise of the housing 10. Therefore, the electric scissors 100 does not configure a separate cooling fan for the motor 30, the structure is simpler, and the overall weight is lighter.

[0037] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0038] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A housing of an electric tool, used for natural heat dissipation of a motor; characterized in that: include: A gripping portion (11) having an installation space formed therein for placing a motor; The support portion (20) protrudes from the inner wall of the gripping portion (11), and comprises a plurality of protrusions (21) arranged along the circumference of the inner wall of the gripping portion (11), with gaps (22) formed between adjacent protrusions (21). When a motor is placed in the installation space, the motor contacts the surface of the protrusions (21).

2. The housing according to claim 1, characterized in that The support portion (20) further comprises a support rib (23) protruding from the inner wall of the grip portion (11), the protrusion (21) protruding from the support rib (23), and the support rib (23) and the protrusion (21) constitute an annular support member for supporting the motor.

3. The housing according to claim 2, characterized in that The distance from the protrusion (21) to the surface of the support rib (23) is greater than the distance from the top surface of the support rib (23) to the inner wall of the gripping portion (11).

4. The housing according to claim 2, characterized in that The protrusions (21) are evenly distributed on the supporting ribs (23).

5. The housing according to claim 2, characterized in that At least two groups of the supporting members are arranged on the inner wall of the gripping portion (11).

6. The housing according to claim 2, characterized in that The sum of the top areas of the protrusions (21) on the support rib (23) is 1 / 4 to 1 / 2 of the top area of ​​the support rib (23).

7. The housing according to claim 2, characterized in that The distance between the top of the protrusion (21) and the inner wall of the gripping portion (11) is 1.5-6 mm.

8. The housing according to claim 1, characterized in that The protrusions (21) are evenly distributed on the inner wall of the holding portion (11) in the installation space.

9. An electric scissors, characterized in that: include: The housing of the electric tool according to any one of claims 1 to 8; A motor (30) is disposed in the installation space and supported on the protrusion (21); a blade (40) connected to one end of the housing; a transmission mechanism, installed in the housing and powered by the motor (30), the transmission mechanism connecting and driving the blades (40) to move closer to or farther from each other; A battery (50) is detachably mounted on the other end of the housing and supplies energy to the motor (30).

10. The electric scissors according to claim 9, characterized in that: No fan is arranged in the installation space.

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