Laser cutting head and cooling device thereof

Abstract

The utility model relates to a laser cutting head and a cooling device thereof, the laser cutting head comprises a shell, the shell is internally provided with a medium cavity, the laser cutting head also comprises an inner stirring part, the inner stirring part is rotatably arranged in the medium cavity and tightly covers the inner ring wall of the shell, and the outer side of the inner stirring part is provided with an inner gear ring; the outer stirring part is rotatably arranged in the medium cavity and tightly covers the outer ring wall of the shell, and an outer gear ring is arranged on the inner side of the outer stirring part; the driving part is provided with a rotatable output shaft, and one end of the output shaft extends into the medium cavity and is connected with a gear meshed with the inner gear ring and the outer gear ring. According to the utility model, the inner stirring part and the outer stirring part which are arranged in the medium cavity and reversely and differentially rotate are arranged, so that two streams of media with different flow directions and flow speeds can collide at all positions in the medium cavity, and a comprehensive'turbulent flow phenomenon 'is forced to occur in the medium cavity, so that a hot film is damaged, and the uniformity of heat distribution of the media is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of water cooling, and particularly relates to a laser cutting head and its cooling device. Background Art

[0002] The cooling device of the laser cutting head is a cooling device set based on the requirement of continuous operation of the laser cutting head. It has an annular structure and is often sleeved outside the laser cutting head. A cooling medium flows through the annular cavity, and heat exchange occurs between the inner wall of the annular cavity and the laser cutting head through the cooling medium to achieve cooling.

[0003] As Figure 1 shown, the figure shows the heat distribution inside the cooling device during actual use. It can be seen that the temperature on the side close to the inner annular wall is relatively high, while the high-temperature medium that is beneficial to absorbing heat is far from the laser cutting head. This is because of the "laminar flow phenomenon" caused by the low flow rate in the annular cavity. The medium near the end wall cannot be metabolized in time and will instead form a thermal film that blocks heat exchange, which is not conducive to dissipating heat from the laser cutting head. Content of the Utility Model

[0004] Aiming at the problems of the prior art, the utility model provides a laser cutting head and its cooling device, and the specific technical solutions are as follows:

[0005] The cooling device of the laser cutting head includes a housing, and a medium cavity is provided inside the housing. It further includes:

[0006] An inner stirring part, which is rotatably arranged in the medium cavity and tightly covers the inner annular wall of the housing. An inner toothed ring is arranged on the outer side of the inner stirring part;

[0007] An outer stirring part, which is rotatably arranged in the medium cavity and tightly covers the outer annular wall of the housing. An outer toothed ring is arranged on the inner side of the outer stirring part;

[0008] A driving part, which has a rotatable output shaft. One end of the output shaft extends into the medium cavity and is connected with a gear that meshes with the inner toothed ring and the outer toothed ring;

[0009] When the gear rotates, it can drive the inner toothed ring and the outer toothed ring to rotate in reverse with different speeds to force a full-scale turbulent flow to occur in the medium cavity.

[0010] As a further technical solution of the utility model, the inner stirring part includes an inner cylinder that is rotatably connected to the housing. The inner cylinder is coaxially arranged with the housing and tightly covers the inner annular wall of the housing. An inner toothed ring is coaxially connected to the outer side of the inner cylinder, and several groups of inner fins are arranged on the outer side of the inner cylinder at equal intervals along its axial direction.

[0011] As a further technical solution of the present utility model, the outer stirring part includes an outer cylinder rotatably connected to the housing. The outer cylinder is coaxially arranged with the housing and tightly covers the outer ring wall of the housing. An outer gear ring is coaxially connected to the inner side of the outer cylinder, and several groups of outer fins are arranged on the inner side of the outer cylinder at equal intervals along its axial direction.

[0012] As a further technical solution of the present utility model, the outer fins and the inner fins are staggered in the axial direction.

[0013] As a further technical solution of the present utility model, there is a gap between the outer fins and the inner fins in the axial direction.

[0014] As a further technical solution of the present utility model, the driving part includes an output motor installed on the housing, and the output end of the output motor is connected to an output shaft.

[0015] As a further technical solution of the present utility model, an inlet communicating with the medium cavity is opened at the bottom of the housing, and an overflow port communicating with the medium cavity is opened at the top of the housing.

[0016] On the other hand, a laser cutting head, a cooling device using the above laser cutting head.

[0017] The beneficial effects of the present utility model are as follows:

[0018] (1) In this application, by arranging the inner stirring part and the outer stirring part that rotate in reverse differential speeds in the medium cavity, collisions of two media with different flow directions and flow rates can occur everywhere in the medium cavity, thereby forcing a comprehensive "turbulent flow phenomenon" to occur in the medium cavity, so as to destroy the thermal film and improve the uniformity of the medium heat distribution.

[0019] (2) In this application, the overflow replacement medium method of entering from the bottom and flowing out from the top is adopted. This is because when the same medium is distributed, the molecular gap of the high-temperature medium is large and the density is small, and it often floats. In this way, the high-temperature medium that has completed heat absorption can be preferentially discharged to ensure the good metabolism of the medium in the medium cavity. Description of the Drawings

[0020] Figure 1 Shows the medium heat distribution diagram in the cooling device in the prior art;

[0021] Figure 2 Shows the overall structural schematic diagram of the cooling device of the laser cutting head;

[0022] Figure 3 Shows the internal structural schematic diagram of the cooling device of the laser cutting head;

[0023] Figure 4 Shows the structural schematic diagram of the inner stirring part, the outer stirring part and the driving part in the installed state;

[0024] Figure 5 Shows a schematic structural diagram of the inner stirring part;

[0025] Figure 6 Shows a schematic structural diagram of the outer stirring part;

[0026] Figure 7 Shows a schematic structural diagram of the driving part;

[0027] Figure 8 Shows a schematic internal structure diagram of the housing.

[0028] Legend:

[0029] 100, housing; 101, inlet; 102, overflow port; 110, inner stirring part; 111, inner cylinder; 112, inner gear ring; 113, inner fin; 120, outer stirring part; 121, outer cylinder; 122, outer gear ring; 123, outer fin; 130, medium cavity; 140, driving part; 141, output motor; 142, output shaft; 143, gear. Detailed implementation mode

[0030] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below in conjunction with the embodiments.

[0031] Based on the laminar flow phenomenon occurring in the cooling device in the prior art, the present application provides a stirring device for driving the medium to flow in the medium cavity, forcing the medium to flow at a high speed and causing a turbulent flow phenomenon to break the thermal film and make the heat distribution in the medium cavity uniform.

[0032] Figure 2 Shows a schematic overall structure diagram of the cooling device of the laser cutting head; Figure 2 In the figure, the cooling device of the laser cutting head includes a housing 100, which is a rotating body as a whole and is sleeved outside the laser cutting head during actual use to cool it.

[0033] Figure 3 Shows a schematic internal structure diagram of the cooling device of the laser cutting head; Figure 2 In the figure, an inner stirring part 110 is arranged on the inner ring wall of the housing 100, an outer stirring part 120 is arranged on the outer ring wall of the housing 100, the inner stirring part 110 and the outer stirring part 120 can cooperate with the housing 100 to form a medium cavity 130 for accommodating the medium, and a driving part 140 is arranged between the inner ring wall and the outer ring wall of the housing 100. The driving part 140 can drive the outer stirring part 120 and the medium cavity 130 to stir the medium.

[0034] Figure 4The figure shows a schematic structural diagram of the internal stirring part 110, the external stirring part 120, and the driving part 140 in an installed state; Figure 4 Among them, the driving part 140 is arranged between the internal stirring part 110 and the external stirring part 120, and can drive the internal stirring part 110 and the external stirring part 120 to rotate simultaneously.

[0035] Figure 5 The figure shows a schematic structural diagram of the internal stirring part 110; Figure 5 Among them, the internal stirring part 110 includes an inner cylinder 111 rotatably connected to the housing 100. The inner cylinder 111 is coaxially arranged with the housing 100 and tightly covers the inner ring wall of the housing 100. An internal gear ring 112 is coaxially connected to the outside of the inner cylinder 111. There are several groups of internal fins 113 equidistantly distributed along the axial direction outside the inner cylinder 111. When the inner cylinder 111 rotates, the several groups of internal fins 113 can stir the medium in the medium chamber 130; multiple groups of internal fins 113 are arranged circumferentially.

[0036] Figure 6 The figure shows a schematic structural diagram of the external stirring part 120; Figure 6 Among them, the external stirring part 120 includes an outer cylinder 121 rotatably connected to the housing 100. The outer cylinder 121 is coaxially arranged with the housing 100 and tightly covers the outer ring wall of the housing 100. An external gear ring 122 is coaxially connected to the inside of the outer cylinder 121. There are several groups of external fins 123 equidistantly distributed along the axial direction inside the outer cylinder 121. When the outer cylinder 121 rotates, the several groups of external fins 123 can stir the medium in the medium chamber 130; multiple groups of external fins 123 are arranged circumferentially; the external fins 123 and the internal fins 113 are staggered in the axial direction; when the internal stirring part 110 and the external stirring part 120 rotate, the external fins 123 and the internal fins 113 can cooperate to stir the medium and form a complete driving surface during stirring; there is a gap between the external fins 123 and the internal fins 113 in the axial direction, which is to reduce the resistance required to be overcome by the internal fins 113 and the external fins 123 during movement, ensure that the stirring is not affected, and part of the medium can flow through the gap to reduce the resistance.

[0037] Figure 7The structural schematic diagram of the driving part 140 is shown; the driving part 140 includes an output motor 141 installed on the housing 100, an output shaft 142 is connected to the output end of the output motor 141, one end of the output shaft 142 extends into the medium cavity 130 and is connected with a gear 143, and the gear 143 meshes with the inner tooth ring 112 and the outer tooth ring 122; starting the output motor 141 can drive the gear 143 to rotate, thereby driving the inner stirring part 110 and the outer stirring part 120 to rotate, and the rotation directions of the inner stirring part 110 and the outer stirring part 120 are opposite. When the inner fins 113 and the outer fins 123 rotate in opposite directions, as the inner fins 113 and the outer fins 123 approach each other, the media driven by the two collide to break the interface of the substance, so as to break the thermal film and promote the uniform distribution of heat in the medium; and, since the inner diameters of the outer stirring part 120 and the inner stirring part 110 are different, the rotation speed of the inner stirring part 110 is greater than that of the outer stirring part 120, so that the position where the medium collision occurs is constantly changing, that is, the position where the inner fins 113 and the outer fins 123 meet is constantly changing, and the thermal film is more comprehensively damaged.

[0038] Figure 8 The internal structural schematic diagram of the housing 100 is shown; Figure 8 In the figure, an inlet 101 communicating with the medium cavity 130 is opened at the bottom of the housing 100, and an overflow port 102 communicating with the medium cavity 130 is opened at the top of the housing 100. The overflow replacement medium method of entering from the bottom and flowing out from the top is adopted. This is because when the same medium is distributed, the molecular gap of the high-temperature medium is large and the density is small, and it often floats. In this way, the high-temperature medium that has completed heat absorption can be preferentially discharged to ensure the good metabolism of the medium in the medium cavity 130.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it.

Claims

1. A cooling device for a laser cutting head, comprising a housing (100), wherein the housing (100) has a medium cavity (130), characterized in that: Also includes: An inner stirring portion (110), the inner stirring portion (110) being rotatably disposed in the medium cavity (130) and tightly covering the inner ring wall of the shell (100), and the outer side of the inner stirring portion (110) being provided with an inner gear ring (112); An external stirring portion (120), the external stirring portion (120) being rotatably disposed in the medium cavity (130) and tightly covering the outer ring wall of the shell (100), and the inner side of the external stirring portion (120) having an external toothed ring (122); A driving part (140), the driving part (140) having a rotatable output shaft (142), one end of the output shaft (142) extending into the medium cavity (130) and connected to a gear (143) meshing with the inner gear ring (112) and the outer gear ring (122); When the gear (143) rotates, it can drive the inner gear ring (112) and the outer gear ring (122) to rotate in opposite directions at differential speeds, thereby forcing a comprehensive turbulent flow to occur in the medium chamber (130).

2. The cooling device for a laser cutting head according to claim 1, characterized in that: The inner stirring portion (110) comprises an inner cylinder (111) rotatably connected to the shell (100); the inner cylinder (111) is coaxially arranged with the shell (100) and tightly covers the inner ring wall of the shell (100); an inner gear ring (112) is coaxially connected to the outer side of the inner cylinder (111); and the inner cylinder (111) has a plurality of groups of inner fins (113) equidistantly distributed along its axial direction.

3. The cooling device for a laser cutting head according to claim 2, characterized in that: The external stirring portion (120) comprises an outer cylinder (121) rotatably connected to the shell (100); the outer cylinder (121) is coaxially arranged with the shell (100) and tightly covers the outer ring wall of the shell (100); an outer gear ring (122) is coaxially connected to the inner side of the outer cylinder (121); and the inner side of the outer cylinder (121) has a plurality of groups of external fins (123) equidistantly distributed along its axial direction.

4. The cooling device for a laser cutting head according to claim 3, characterized in that: The outer fins (123) and the inner fins (113) are distributed alternately in the axial direction.

5. The cooling device for a laser cutting head according to claim 3, characterized in that: The outer fin (123) and the inner fin (113) have a gap in the axial direction.

6. The cooling device for a laser cutting head according to claim 3, characterized in that: The driving unit (140) comprises an output motor (141) mounted on the housing (100), and an output end of the output motor (141) is connected to an output shaft (142).

7. The cooling device for a laser cutting head according to claim 3, characterized in that: An inlet (101) communicating with the medium cavity (130) is provided at the bottom of the shell (100), and an overflow port (102) communicating with the medium cavity (130) is provided at the top of the shell (100).

8. Laser cutting head, characterized in that, A cooling device for a laser cutting head comprising the cooling device of any one of claims 1 to 7.

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