Heat exchange device of 3D printing equipment

Abstract

The utility model discloses a 3D printing equipment heat exchange device which comprises a shell, a heating pipe and a plurality of heat exchange pipes, and the shell is provided with a normal-temperature nitrogen inlet, a high-temperature nitrogen inlet, a heating nitrogen outlet, a first cooling nitrogen outlet and a second cooling nitrogen outlet; the high-temperature nitrogen inlet is communicated with the printing cavity through a pipeline; the heating nitrogen outlet is aligned with a protective mirror in the printing cavity; a direction control valve communicated with the high-temperature nitrogen inlet is mounted between the first cooling nitrogen outlet and the second cooling nitrogen outlet; the second cooling nitrogen outlet is communicated with the printing cavity through a heating pipe; the heating pipe is coated with a heating plate; the plurality of heat exchange tubes are uniformly mounted in the shell in parallel, and the normal-temperature nitrogen inlet is communicated with the heated nitrogen outlet through the plurality of heat exchange tubes. The device can heat normal-temperature nitrogen and is low in energy consumption.

Description

Technical Field

[0001] The utility model relates to the technical field of heating devices for 3D printing equipment, and more specifically, to a heat exchange device for 3D printing equipment. Background Art

[0002] In a powder laser sintering three-dimensional printing system, since the temperature of the processing chamber is relatively high, generally one protective mirror separates the scanner from the processing chamber, and only the laser beam can pass through this protective mirror and enter the processing chamber for processing operations. During this process, in order to keep the protective mirror clean, nitrogen gas is used to blow it.

[0003] However, at the high temperature of the processing chamber, the input of normal-temperature nitrogen gas cannot fully play the role of cleaning the protective window mirror. The normal-temperature nitrogen gas will cause the dust in the printing chamber to condense on the protective mirror and affect the laser power. In addition, in order to increase the temperature of part of the nitrogen gas, it needs to be heated separately, resulting in high energy consumption.

[0004] Therefore, providing a heat exchange device for 3D printing equipment is an urgent problem to be solved by those skilled in the art. Content of the Utility Model

[0005] In view of this, the utility model provides a heat exchange device for 3D printing equipment, which can heat normal-temperature nitrogen gas with low energy consumption.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] A heat exchange device for 3D printing equipment, comprising:

[0008] A housing, the housing has a normal-temperature nitrogen gas inlet, a high-temperature nitrogen gas inlet, a heated nitrogen gas outlet, a first cooled nitrogen gas outlet, and a second cooled nitrogen gas outlet; the high-temperature nitrogen gas inlet is connected and communicated with the printing chamber through a pipeline; the heated nitrogen gas outlet is aligned with the protective mirror in the printing chamber; a direction control valve that is connected and communicated with the high-temperature nitrogen gas inlet is installed between the first cooled nitrogen gas outlet and the second cooled nitrogen gas outlet;

[0009] A heating pipe, the second cooled nitrogen gas outlet is connected and communicated with the printing chamber through the heating pipe; a heating plate is coated on the heating pipe;

[0010] A plurality of heat exchange pipes, the plurality of heat exchange pipes are installed in parallel and evenly inside the housing, and the normal-temperature nitrogen gas inlet is connected and communicated with the heated nitrogen gas outlet through the plurality of heat exchange pipes.

[0011] By adopting the above technical scheme, the beneficial effects of the utility model are:

[0012] The normal-temperature nitrogen gas entering from the normal-temperature nitrogen gas inlet exchanges heat with the high-temperature nitrogen gas entering from the high-temperature nitrogen gas inlet and discharged from the printing chamber inside the housing. The normal-temperature nitrogen gas is heated and discharged from the heated nitrogen gas outlet to blow air on the protective mirror, while the high-temperature nitrogen gas is cooled and part of it is discharged into the air, and the other part is heated and raised in temperature by the heating plate and then enters the printing chamber again. In this way, the cycle is repeated, realizing the heating of the normal-temperature nitrogen gas and utilizing the energy of the high-temperature nitrogen gas discharged from the printing chamber, thereby reducing energy consumption.

[0013] Further, it further includes a plurality of baffle plates, and the plurality of baffle plates are all installed inside the housing and are alternately distributed up and down; a plurality of the heat exchange tubes are all inserted on the plurality of baffle plates.

[0014] The beneficial effect of adopting the above further technical solution is to improve the heat transfer efficiency.

[0015] Further, it further includes a temperature sensor and a controller. The temperature sensor is installed on the heating tube, and the temperature-sensitive element of the temperature sensor extends into the heating tube; the temperature sensor is electrically connected to the controller, and the controller is electrically connected to the heating plate.

[0016] The beneficial effect of adopting the above further technical solution is to realize the real-time control of the heating temperature of the nitrogen gas.

[0017] Further, it further includes a heat insulation layer, and the heat insulation layer is coated on the housing.

[0018] The beneficial effect of adopting the above further technical solution is to reduce the heat dissipation, thereby reducing the energy loss. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention 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 the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0020] Figure 1 The drawings are the overall structural schematic diagram of a heat exchange device for a 3D printing device provided by the present invention;

[0021] Figure 2 The drawings are the perspective sectional view of a heat exchange device for a 3D printing device provided by the present invention;

[0022] Figure 3 The drawings are the working principle diagrams of a heat exchange device for a 3D printing device provided by the present invention. Detailed Embodiments

[0023] The technical solutions in the embodiments of the present utility model will be clearly and completely described below 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 the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0024] As Figures 1-3 shown, an embodiment of the present utility model discloses a heat exchange device for a 3D printing device, including a housing 1, a heating pipe 2, and a plurality of heat exchange pipes 3. The housing 1 has a normal-temperature nitrogen inlet 11, a high-temperature nitrogen inlet 12, a heated nitrogen outlet 13, a first cooling nitrogen outlet 14, and a second cooling nitrogen outlet 15. The high-temperature nitrogen inlet 12 is connected and communicated with the printing chamber 4 through a pipeline. The heated nitrogen outlet 13 is aligned with the protective mirror 5 in the printing chamber 4. A direction control valve that is connected and communicated with the high-temperature nitrogen inlet 12 is installed between the first cooling nitrogen outlet 14 and the second cooling nitrogen outlet 15. The second cooling nitrogen outlet 15 is connected and communicated with the printing chamber 4 through the heating pipe 2. A heating plate 6 is coated on the heating pipe 2. A plurality of heat exchange pipes 3 are installed in parallel and evenly inside the housing 1, and the normal-temperature nitrogen inlet 11 and the heated nitrogen outlet 13 are connected and communicated through the plurality of heat exchange pipes 3. In the present utility model, the normal-temperature nitrogen entering from the normal-temperature nitrogen inlet 11 exchanges heat with the high-temperature nitrogen discharged from the printing chamber 4 and entering from the high-temperature nitrogen inlet 12 inside the housing 1. The normal-temperature nitrogen is heated and discharged from the heated nitrogen outlet 13 to blow air on the protective mirror 5, while a part of the high-temperature nitrogen is discharged into the air after being cooled, and the other part is heated and raised in temperature by the heating plate 6 and then enters the printing chamber 4 again. By repeating this cycle, the heating of the normal-temperature nitrogen is realized, and the energy of the high-temperature nitrogen discharged from the printing chamber 4 is utilized, reducing the energy consumption.

[0025] To further optimize the technical solution of the present utility model, a plurality of baffle plates 7 are further included. The plurality of baffle plates 7 are all installed inside the housing 1 and are distributed alternately up and down. The plurality of heat exchange pipes 3 all penetrate through the plurality of baffle plates 7, thereby improving the heat transfer efficiency.

[0026] To further optimize the technical solution of the present utility model, a temperature sensor 8 and a controller are further included. The temperature sensor 8 is installed on the heating pipe 2, and the temperature-sensitive element of the temperature sensor 8 extends into the heating pipe 2. The temperature sensor 8 is electrically connected to the controller, and the controller is electrically connected to the heating plate 6 to realize the real-time control of the heating temperature of the nitrogen.

[0027] To further optimize the technical solution of the present utility model, a heat insulation layer 9 is further included. The heat insulation layer 9 is coated on the housing 1, thereby reducing the heat dissipation and thus reducing the energy loss.

[0028] Working principle of the utility model:

[0029] Normal-temperature nitrogen enters the heat exchange tube 3 through the normal-temperature nitrogen inlet 11. At the same time, high-temperature nitrogen enters the space between the housing 1 and the heat exchange tube 3 through the high-temperature nitrogen inlet 12. The normal-temperature nitrogen and the high-temperature nitrogen conduct heat exchange. After being heated, the normal-temperature nitrogen is discharged from the heated nitrogen outlet 13 and then output to the inside of the printing chamber 4 to blow air for dust prevention against the protective mirror 5.

[0030] The high-temperature nitrogen in the printing chamber 4 enters the inside of the housing 1 through the high-temperature nitrogen inlet 12. The normal-temperature nitrogen and the high-temperature nitrogen conduct heat exchange. After the high-temperature nitrogen is cooled down, a part of it is discharged into the air from the first cooled nitrogen outlet 14 to maintain a certain air pressure in the printing chamber 4, and another part is discharged into the heating tube 2 from the second cooled nitrogen outlet 15. The flow direction of the cooled nitrogen is controlled by a direction control valve during this process. The heating plate 6 heats the cooled nitrogen, and then it enters the printing chamber 4 again, and this cycle repeats.

[0031] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple. For the relevant parts, reference can be made to the description in the method section.

[0032] The above description of the disclosed embodiments enables those skilled in the art to implement or use the utility model. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A heat exchange device for 3D printing equipment, characterized in that: include: A housing, wherein the housing has a normal temperature nitrogen inlet, a high temperature nitrogen inlet, a heating nitrogen outlet, a first cooling nitrogen outlet, and a second cooling nitrogen outlet; the high temperature nitrogen inlet is connected to the printing chamber through a pipeline; the heating nitrogen outlet is aligned with the protective mirror in the printing chamber; a directional control valve is installed between the first cooling nitrogen outlet and the second cooling nitrogen outlet, both of which are connected to the high temperature nitrogen inlet; A heating tube, wherein the second cooling nitrogen outlet is connected to the printing chamber through the heating tube; the heating tube is coated with a heating plate; A plurality of heat exchange tubes are arranged in parallel and evenly inside the shell, and the normal temperature nitrogen inlet and the heated nitrogen outlet are connected and communicated through the plurality of heat exchange tubes.

2. A 3D printing equipment heat exchange device according to claim 1, characterized in that: It also includes a plurality of baffles, which are all installed inside the shell and are alternately distributed up and down; and the plurality of heat exchange tubes are all inserted on the plurality of baffles.

3. A 3D printing equipment heat exchange device according to claim 1, characterized in that: It also includes a temperature sensor and a controller. The temperature sensor is installed on the heating tube, and the temperature sensitive element of the temperature sensor extends into the interior of the heating tube; the temperature sensor is electrically connected to the controller, and the controller is electrically connected to the heating plate.

4. A 3D printing equipment heat exchange device according to claim 1, characterized in that: It also includes a heat-insulating layer, which is coated on the shell.

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