Heat dissipation structure of power wrench

Abstract

The utility model provides a heat dissipation structure of a power wrench, and belongs to the field of electric tools. The problem that an existing wrench is not ideal in heat dissipation is solved. In the utility model, the wrench comprises a casing, the casing comprises a cylindrical and horizontally arranged mounting part, a motor is horizontally arranged in the mounting part, the heat dissipation structure comprises an air inlet arranged at the rear end of the mounting part and fan blades arranged in the mounting part, the fan blades are positioned between the air inlet and the motor, and a cylindrical positioning seat is also coaxially arranged in the mounting part. The positioning seat comprises an outer barrel fixedly connected with the mounting part, a base arranged in the outer barrel and a circle of connecting pieces connecting the outer barrel and the base, the connecting pieces are located between the base and the outer barrel, and an air guide opening is formed between every two adjacent connecting pieces; the two fan blades are located in the outer cylinder and distributed in the axial direction of the motor, a connecting rod coaxial with the motor is further arranged in the outer cylinder, the two fan blades are fixed to the connecting rod, and the front end of the connecting rod is fixedly connected with the rear end of a rotating shaft of the motor. Heat dissipation of the power wrench can be improved.

Description

Technical Field

[0001] The utility model belongs to the field of electric tools and relates to a power wrench, in particular to a heat dissipation structure of a power wrench. Background Art

[0002] Power wrenches, especially electric wrenches, are industrial power tools that are mainly used for disassembly and assembly of bolts and nuts. They play an important role in many fields.

[0003] Existing wrenches, such as an applicable electric wrench structure disclosed in the Chinese Patent Library (application number: 201621418327.1), include a connector, a body, an adjustable speed switch, a charging port, a motor, a noise reducer and a built-in wire, an alloy sleeve is installed on the left side of the body, and a connector is installed on the right side of the alloy sleeve, a heat dissipation hole is installed on the right side of the connector, and an adjustable speed switch is installed on the lower left side of the heat dissipation hole, a handle is installed on the right side below the adjustable speed switch, and a charging port is installed on the right side below the handle, a base is installed on the left side of the charging port, and a battery locking button is installed above the base, a rotating shaft is installed on the upper left side of the body, and a motor is installed on the right side of the rotating shaft, an exhaust fan is installed on the right side of the motor, and a noise reducer is installed on the lower right side of the exhaust fan, a forward and reverse regulator is installed on the lower left side of the noise reducer, and a built-in wire is installed on the right side below the forward and reverse regulator, and a large-capacity lithium battery is installed below the built-in wire.

[0004] The above-mentioned wrench uses an exhaust fan to dissipate the heat of the motor. Since there is only one exhaust fan, the heat on the wrench under load cannot be quickly dissipated, and the heat dissipation effect is not very good. Utility Model Content

[0005] The utility model aims to solve the above problems in the prior art and proposes a heat dissipation structure for a power wrench, and solves the technical problem of how to improve the heat dissipation effect.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a heat dissipation structure of a power wrench, the wrench includes a casing, the casing includes a cylindrical and horizontally arranged mounting portion, a motor is horizontally arranged in the mounting portion, the heat dissipation structure includes an air inlet arranged at the rear end of the mounting portion and fan blades arranged in the mounting portion, and the fan blades are located between the air inlet and the motor, and is characterized in that a cylindrical positioning seat is coaxially arranged in the mounting portion, the positioning seat includes an outer cylinder fixedly connected to the mounting portion, a base arranged in the outer cylinder, and a circle of connecting plates connecting the outer cylinder and the base, the connecting plate is between the base and the outer cylinder, and an air guide port is formed between two adjacent connecting plates; the fan blades are in the outer cylinder, there are two fan blades and they are distributed along the axial direction of the motor, a connecting rod coaxial with the motor is also arranged in the outer cylinder, the two fan blades are fixed on the connecting rod, and the front end of the connecting rod is fixedly connected to the rear end of the motor shaft.

[0007] When in use, the operation of the motor drives the two fan blades to rotate synchronously, and the wind generated by the fan blades blows forward through the air guide port to blow and dissipate heat for the motor and the wrench power head.

[0008] The design of two axial blades can generate a larger air volume when rotating, so as to effectively increase the amount and speed of cold air flowing forward, greatly enhance the heat dissipation speed and effect of the internal parts of the installation part, improve the heat dissipation effect of the power wrench, and thus increase the life and working stability of the power wrench.

[0009] In the above-mentioned power wrench heat dissipation structure, the above-mentioned fan blades include an annular base and a circle of blades formed on the outer wall of the base, the base is sleeved on the connecting rod, and the outer wall of the connecting rod is fixed with a retaining ring 1 and a retaining ring 2, the two adjacent end surfaces of the two bases are tightly together, and the two end surfaces of the two bases that are far away are respectively pressed on the retaining ring 1 and the retaining ring 2. The two fan blades are clamped and positioned between the retaining ring 1 and the retaining ring 2, and the friction generated by the clamping is used to make the fan blades rotate synchronously with the connecting rod, which has the advantages of easy assembly and stable operation.

[0010] In the above-mentioned heat dissipation structure of the power wrench, the retaining ring 1 and the connecting rod are an integrated structure, the retaining ring 2 and the connecting rod are a split structure, and the retaining ring 1 is located between the motor and the fan blades, which makes it more convenient to install the fan blades.

[0011] In the above-mentioned power wrench heat dissipation structure, the second retaining ring and the connecting rod are threadedly connected, which further facilitates the disassembly and assembly of the fan blades.

[0012] In the above-mentioned heat dissipation structure of the power wrench, a socket is axially provided at the front end of the connecting rod, and the rear end of the rotating shaft is inserted into the socket, which serves as an installation guide and facilitates the subsequent positioning of the rotating shaft and the connecting rod.

[0013] In the above-mentioned power wrench heat dissipation structure, the base is cylindrical and coaxial with the outer cylinder, and a ring-shaped limit seat is formed on the inner wall of the base. The rear end of the motor is inserted into the base and pressed on the limit seat, and the rear end of the motor shaft extends out of the base and is fixedly connected to the connecting rod. Under the action of the limit seat, the motor can be installed in place at one time, which further facilitates assembly.

[0014] In the above-mentioned heat dissipation structure of the power wrench, a plurality of air holes are axially penetrated on the limit seat, so that part of the wind generated by the fan blades is directly blown toward the motor, further accelerating the heat dissipation of the motor.

[0015] In the above-mentioned heat dissipation structure of the power wrench, the air hole is in the shape of an arc coaxial with the base, so as to increase the flow guide area and achieve better heat dissipation of the motor.

[0016] In the above-mentioned power wrench heat dissipation structure, the connecting piece is arc-shaped and its two ends are respectively connected to the outer cylinder and the base. The axes of the connecting piece and the outer cylinder are vertically arranged to enhance the overall strength of the positioning seat, support the motor more stably, and ensure stable operation of the wrench.

[0017] In the above-mentioned heat dissipation structure of the power wrench, the positioning seat is an integrated plastic part, which is convenient for processing and manufacturing.

[0018] Compared with the prior art, the heat dissipation structure of the power wrench has the following advantages:

[0019] 1. The design of two axial blades can generate a larger air volume when rotating, so as to effectively increase the amount and wind speed of cold air flowing forward, greatly enhance the heat dissipation speed and effect of the internal parts of the installation part, improve the heat dissipation effect of the power wrench, and thus increase the life and working stability of the power wrench.

[0020] 2. The two blades are clamped and positioned between retaining ring 1 and retaining ring 2, and the friction generated by the clamping is used to make the blades rotate synchronously with the connecting rod, which has the advantages of easy assembly and stable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional schematic diagram of a power wrench.

[0022] Figure 2 It is a cross-sectional schematic diagram of a power wrench.

[0023] Figure 3 It is a connection diagram between the motor and the positioning seat.

[0024] In the figure, 1, casing; 1a, mounting part; 1b, air inlet; 2, motor; 3, fan blade; 3a, base; 3b, blade; 4, positioning seat; 4a, outer cylinder; 4a1, clamping strip; 4b, base; 4b1, limiting seat; 4b2, air hole; 4c, connecting piece; 4d, air guide port; 5, connecting rod; 5a, baffle ring 1; 6, baffle ring 2. DETAILED DESCRIPTION

[0025] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0026] like Figure 1 and Figure 2 As shown, the power wrench includes a housing 1, which includes a cylindrical and horizontally arranged mounting portion 1a, in which a motor 2 is horizontally arranged, and the motor 2 and the housing 1 are coaxially arranged.

[0027] The heat dissipation structure of the power wrench includes an air inlet 1b arranged at the rear end of the mounting portion 1a and a fan blade 3 arranged in the mounting portion 1a. The fan blade 3 is located between the air inlet 1b and the motor 2, and the fan blade 3 and the motor 2 are coaxially arranged. There are multiple air inlets 1b, some of which are arranged on the rear end side wall of the mounting portion 1a, and the remaining air inlets 1b are arranged on the rear end surface of the mounting portion 1a to increase the air intake. Figure 2 and Figure 3As shown, a cylindrical positioning seat 4 is coaxially disposed in the mounting portion 1a, and the positioning seat 4 includes an outer cylinder 4a fixedly connected to the mounting portion 1a, a base 4b disposed in the outer cylinder 4a, and a circle of connecting pieces 4c connecting the outer cylinder 4a and the base 4b. The connecting piece 4c is located between the base 4b and the outer cylinder 4a, and an air guide 4d is formed between two adjacent connecting pieces 4c.

[0028] like Figure 2 As shown, the fan blades 3 are in the outer cylinder 4a, and there are two fan blades 3 distributed along the axial direction of the motor 2. A connecting rod 5 coaxial with the motor 2 is also provided in the outer cylinder 4a, and both fan blades 3 are fixed on the connecting rod 5, and the front end of the connecting rod 5 is fixedly connected to the rear end of the motor 2 shaft.

[0029] When in use, the motor 2 drives the two fan blades 3 to rotate synchronously, and the wind generated by the fan blades 3 blows forward through the air guide port 4d to blow and dissipate heat to the motor 2 and the wrench power head.

[0030] The design of the two axial blades 3 can generate a larger air volume when rotating, so as to effectively increase the amount and wind speed of cold air flowing forward, greatly enhance the heat dissipation speed and effect of the internal components of the mounting part 1a, improve the heat dissipation effect of the power wrench, and thus improve the life and working stability of the power wrench.

[0031] In this embodiment,

[0032] The installation method of the fan blade 3 is as follows: the fan blade 3 is a plastic integral part, and the fan blade 3 includes a ring-shaped base 3a and a circle of blades 3b formed on the outer wall of the base 3a. The base 3a is sleeved on the connecting rod 5. The outer wall of the connecting rod 5 is fixed with a retaining ring 1 5a and a retaining ring 2 6, and the retaining ring 1 5a and the retaining ring 2 6 are coaxially arranged. The two adjacent end surfaces of the two bases 3a are tightly attached together, and the two end surfaces of the two bases 3a that are far away from each other are pressed tightly on the retaining ring 1 5a and the retaining ring 2 6 respectively. The two fan blades 3 are clamped and positioned between the retaining ring 1 5a and the retaining ring 2 6, and the friction generated by the clamping is used to make the fan blades 3 rotate synchronously with the connecting rod 5, which has the advantages of easy assembly and stable operation.

[0033] Among them, the retaining ring 1 5a and the connecting rod 5 are an integrated structure, the retaining ring 2 6 and the connecting rod 5 are a split structure, and the retaining ring 1 5a is between the motor 2 and the fan blade 3, which is more convenient for installing the fan blade 3. Preferably, the retaining ring 2 6 and the connecting rod 5 are threadedly connected to further facilitate the disassembly and assembly of the fan blade 3.

[0034] The connecting rod 5 and the rotating shaft are connected in the following manner: a socket is axially provided at the front end of the connecting rod 5, and the rear end of the rotating shaft is inserted into the socket, which serves as an installation guide and facilitates the subsequent positioning of the rotating shaft and the connecting rod 5. In actual products, the rotating shaft and the connecting rod 5 are welded and fixedly connected.

[0035] The motor 2 and the base 4b are installed as follows: the base 4b is cylindrical and coaxial with the outer tube 4a, and a ring-shaped limit seat 4b1 is formed on the inner wall of the base 4b, and the limit seat 4b1 and the base 4b are coaxially arranged. The rear end of the motor 2 is inserted into the base 4b and pressed on the limit seat 4b1, and the rear end of the motor 2 shaft extends out of the base 4b and is fixedly connected to the connecting rod 5. Under the action of the limit seat 4b1, the motor 2 is installed in place at one time, which further facilitates assembly. Preferably, the motor 2 is fixedly connected to the limit seat 4b1 by a circle of screws.

[0036] Further explanation, the limiting seat 4b1 is axially penetrated with a plurality of air holes 4b2, so that part of the wind generated by the fan blades 3 is directly blown toward the motor 2, further accelerating the heat dissipation of the motor 2. Preferably, the air holes 4b2 are in an arc shape coaxial with the base 4b to increase the guide area and make the heat dissipation of the motor 2 better.

[0037] The outer tube 4a is connected to the mounting portion 1a in the following manner: the shape and size of the outer wall of the outer tube 4a match those of the mounting portion 1a, and the outer tube 4a is clamped in the mounting portion 1a. To further explain, a positioning hole and a circle of clamping strips 4a1 are formed on the outer wall of the outer tube 4a, and the length of the clamping strips 4a1 extends along the axial direction of the outer tube 4a. A clamping groove matching the clamping strips 4a1 and a protrusion matching the positioning hole are formed on the inner wall of the mounting portion 1a. The number of clamping strips 4a1 and the number of clamping strips 4a1 are the same, and the clamping strips 4a1 are clamped in the corresponding clamping grooves, and the protrusions are inserted in the positioning holes to stably position the outer tube 4a in the mounting portion 1a.

[0038] like Figure 3 As shown, the connecting piece 4c is arc-shaped and its two ends are respectively connected to the outer cylinder 4a and the base 4b. The axes of the connecting piece 4c and the outer cylinder 4a are vertically arranged to enhance the overall strength of the positioning seat 4, support the motor 2 more stably, and ensure the stable operation of the wrench.

[0039] In actual products, the positioning seat 4 is a plastic integral part, which is convenient for processing and manufacturing.

[0040] The specific embodiments described herein are merely examples of the spirit of the present invention. A person skilled in the art of the present invention may make various modifications or additions to the specific embodiments described or replace them in a similar manner, but this will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A heat dissipation structure for a power wrench, the wrench comprising a housing (1), the housing (1) comprising a cylindrical and horizontally arranged mounting portion (1a), a motor (2) being horizontally arranged in the mounting portion (1a), the heat dissipation structure comprising an air inlet (1b) arranged at the rear end of the mounting portion (1a) and a fan blade (3) arranged in the mounting portion (1a), and the fan blade (3) being located between the air inlet (1b) and the motor (2), characterized in that: A cylindrical positioning seat (4) is coaxially arranged in the mounting portion (1a), the positioning seat (4) comprising an outer cylinder (4a) fixedly connected to the mounting portion (1a), a base (4b) arranged in the outer cylinder (4a), and a circle of connecting pieces (4c) connecting the outer cylinder (4a) and the base (4b), the connecting piece (4c) being located between the base (4b) and the outer cylinder (4a), and an air guide port (4d) being formed between two adjacent connecting pieces (4c); the fan blades (3) are located in the outer cylinder (4a), the fan blades (3) are two and are distributed along the axial direction of the motor (2), a connecting rod (5) coaxial with the motor (2) is also arranged in the outer cylinder (4a), the two fan blades (3) are fixed on the connecting rod (5), and the front end of the connecting rod (5) is fixedly connected to the rear end of the rotating shaft of the motor (2).

2. The heat dissipation structure of the power wrench according to claim 1, characterized in that: The fan blade (3) comprises an annular base (3a) and a circle of blades (3b) formed on the outer wall of the base (3a). The base (3a) is sleeved on the connecting rod (5). A retaining ring (5a) and a retaining ring (6) are fixed on the outer wall of the connecting rod (5). The two adjacent end surfaces of the two bases (3a) are tightly attached together, and the two end surfaces of the two bases (3a) that are far away from each other are pressed tightly on the retaining ring (5a) and the retaining ring (6).

3. The heat dissipation structure of the power wrench according to claim 2, characterized in that: The retaining ring 1 (5a) and the connecting rod (5) are an integrated structure, the retaining ring 2 (6) and the connecting rod (5) are a split structure, and the retaining ring 1 (5a) is located between the motor (2) and the fan blade (3).

4. The heat dissipation structure of the power wrench according to claim 3, characterized in that: The second retaining ring (6) and the connecting rod (5) are threadedly connected.

5. The heat dissipation structure of the power wrench according to claim 1, characterized in that: A socket is axially provided at the front end of the connecting rod (5), and the rear end of the rotating shaft is plugged into the socket.

6. The heat dissipation structure of the power wrench according to claim 1, characterized in that: The base (4b) is in the shape of a cylinder coaxial with the outer cylinder (4a), and an annular limit seat (4b1) is formed on the inner wall of the base (4b). The rear end of the motor (2) is inserted into the base (4b) and pressed on the limit seat (4b1), and the rear end of the motor (2) shaft extends out of the base (4b) and is fixedly connected to the connecting rod (5).

7. The heat dissipation structure of the power wrench according to claim 6, characterized in that: A plurality of air holes (4b2) are axially penetrated through the limiting seat (4b1).

8. The heat dissipation structure of the power wrench according to claim 7, characterized in that: The air hole (4b2) is in the shape of an arc coaxial with the base (4b).

9. The heat dissipation structure of the power wrench according to claim 1, characterized in that: The connecting piece (4c) is in an arc shape and has two ends respectively connected to the outer cylinder (4a) and the base (4b), and the axes of the connecting piece (4c) and the outer cylinder (4a) are arranged perpendicularly.

10. The heat dissipation structure of the power wrench according to claim 9, characterized in that: The positioning seat (4) is a plastic integral part.

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