A gas path device for reducing pressure drop in laser cutting

Abstract

The present invention provides a gas path device for reducing the pressure drop of laser cutting, including a branch, a valve seat and a laser head. Three branches are provided. A partition straight-through joint, a filter, a flow control valve and a one-way valve are installed on the branch from left to right in sequence. A pressure switch is also provided between the filter and the flow control valve. The components of the branch are internally connected. An electrical proportional valve is also provided on one of the branches. The structural design of the present invention is reasonable. When the minimum diameter of each branch for circulating different gases is the set value, that is, the minimum diameter of the nitrogen branch is 15mm / the minimum diameter of the air branch is 13mm / the minimum diameter of the oxygen branch is 13mm, and the intake pressure is between 20bar and 25bar, the branch flow path becomes larger, the resistance encountered during gas circulation becomes smaller, and the energy consumed is smaller; the enlargement of the branch flow path increases the flow rate of the pipeline, improves the energy of gas circulation, and because the cross-sectional area of ​​the branch outlet is constant, the pressure of the outlet is increased.

Description

Technical Field

[0001] The invention belongs to the technical field of laser cutting gas path devices, in particular to a gas path device for reducing the pressure drop of laser cutting. Background Art

[0002] During laser cutting, the pressure drop difference between the inlet pressure and the outlet pressure is too large, resulting in an uneven cutting surface and failing to achieve the desired effect. This is because the path of the gas flow is too small, resulting in too much resistance in the process of gas flow. When the energy at the inlet end is constant, each object that the object flows through, that is, each component that passes through will do work and consume energy. The greater the resistance, the more work will be done, and the greater the energy consumption, which will cause the outlet pressure to drop. Summary of the invention

[0003] The present invention provides an air path device for reducing the pressure drop of laser cutting, which is used to solve the problem that the cutting surface is not smooth due to the large pressure drop difference between the inlet pressure and the outlet pressure, thereby achieving the beneficial effects of reducing the pressure difference and improving the cutting effect.

[0004] The present invention is achieved through the following technical solutions:

[0005] A gas circuit device for reducing the pressure drop of laser cutting comprises a branch, a valve seat and a laser head. Three branches are provided. A partition straight-through joint, a filter, a flow control valve and a one-way valve are installed on the branch from left to right in sequence. A pressure switch is also provided between the filter and the flow control valve. The components of the branch are internally connected. An electrical proportional valve is also provided on one of the branches. The electrical proportional valve is located between the one-way valve and the valve seat of the branch.

[0006] Furthermore, the one-way valve and the valve seat are connected via an adapter with a sealing ring and a universal joint with a sealing ring.

[0007] Furthermore, one end of the branch away from the laser head is connected to the gas storage tank, and one end of the branch close to the gas storage tank is provided with a pressure gauge.

[0008] Furthermore, the gas flowing in the branch is nitrogen / air, and the gas flowing in the branch with the electric proportional valve is oxygen.

[0009] Furthermore, the minimum diameter of the branch for nitrogen flow is 15 mm.

[0010] Furthermore, the minimum diameter of the air-permeable branch is 13 mm.

[0011] Furthermore, the minimum diameter of the branch for oxygen is 13 mm.

[0012] The advantages of the present invention are:

[0013] The structural design of the present invention is reasonable. When the minimum diameter of each branch for different gases is the set value, that is, the minimum diameter of the nitrogen branch is 15mm / the minimum diameter of the air branch is 13mm / the minimum diameter of the oxygen branch is 13mm, and the intake pressure is between 20bar-25bar, the branch flow path becomes larger, the resistance encountered during gas flow becomes smaller, and the energy consumed is smaller; the larger branch flow path increases the flow rate of the pipeline and improves the energy of gas flow, and because the cross-sectional area of ​​the branch outlet is constant, the pressure of the outlet is increased. By increasing the size of the outlet pressure, the phenomenon of excessive pressure difference is effectively eliminated, thereby assisting the laser equipment cutting equipment in meeting the air pressure requirements when cutting different plates, and achieving the ideal cutting process requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 It is a structural schematic diagram of the present invention.

[0016] In the figure, 1. branch; 2. valve seat; 3. laser head; 4. partition straight-through connector; 5. filter; 6. flow control valve; 7. check valve; 8. pressure switch; 9. electric proportional valve. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0018] A gas path device for reducing pressure drop in laser cutting, such as Figure 1As shown, it includes a branch 1, a valve seat 2 and a laser head 3 with a diameter of 10 mm. The branch 1 is provided with three branches. The valve seat 2 is a four-way valve seat. The valve seat 2 is provided with three inlets and one outlet, that is, one end of the branch 1 is connected to the inlet end of the valve seat 2, and the outlet end of the valve seat 2 is connected to the laser head 3; a partition straight-through connector 4, a filter 5, a flow control valve 6 and a one-way valve 7 are installed on the branch 1 from left to right in sequence. The filter 5 arranged on the branch 1 for circulating nitrogen adopts a high-pressure nitrogen filter 5 of model HFP-1, and the filter 5 arranged on the branch 1 for circulating air / oxygen adopts an air / oxygen filter 5 of model MAF401A. A pressure switch 8 is also arranged between the filter 5 and the flow control valve 6. The circulation control valve 6 is a high-pressure nitrogen solenoid valve of model 321H35-DC24V, the circulation control valve 6 on the branch 1 for circulating air / oxygen is a medium-pressure air / oxygen solenoid valve of model 366501-DC24V, the components on the branch 1 are internally connected, the one-way valve 7 on the branch 1 for circulating nitrogen is a one-way valve 7 of model 100001-1 / 2, the one-way valve 7 on the branch 1 for circulating air / oxygen is a one-way valve 7 of model 100001-3 / 8, one of the branches 1 is also provided with an electric proportional valve 9, the electric proportional valve 9 is an SMC high-pressure proportional valve, and the electric proportional valve 9 is located between the one-way valve 7 and the valve seat 2 of the branch 1.

[0019] The one-way valve 7 is connected to the valve seat 2 through an adapter with a sealing ring and a universal joint with a sealing ring. The adapter model provided on the branch 1 for circulating nitrogen is DZ-XA15-R / L-1 / 2, the adapter model provided on the branch 1 for circulating air / oxygen is DZ-XA15-R / L-3 / 8, and the universal joint model is VADKO 15-RL / WD. The end of the branch 1 away from the laser head 3 is connected to the gas storage tank, and the end of the branch 1 close to the gas storage tank is provided with a pressure gauge.

[0020] The gas flowing in the branch 1 is nitrogen / air, and the gas flowing in the branch 1 with the electric proportional valve 9 is oxygen. The minimum diameter in the branch 1 for nitrogen is 15mm. The minimum diameter in the branch 1 for air is 13mm. The minimum diameter in the branch 1 for oxygen is 13mm.

[0021] When using the equipment, the gas flow path is: gas storage tank → pressure gauge → partition straight-through connector → filter → flow control valve → check valve → four-way valve seat → laser head. During the experiment, it was found that under certain conditions of the gas flow path in the branch, as the cross-sectional area of ​​the branch outlet increases, the pressure drop at the branch outlet becomes more obvious and the pressure drop becomes greater. In order to ensure that the outlet pressure can meet the working requirements, the experiment proves that increasing the diameter of the branch through which the gas intake flows can effectively avoid the problem of poor cutting effect caused by large pressure drop (under the condition of constant outlet cross-sectional area). The data before and after the improvement of different branches are recorded, and the experimental data are shown in Table 1-6.

[0022] When the minimum diameter of each branch for different gases is the set value, that is, the minimum diameter of the nitrogen branch is 15mm / the minimum diameter of the air branch is 13mm / the minimum diameter of the oxygen branch is 13mm, and the intake pressure is between 20bar-25bar, the branch flow path becomes larger, the resistance encountered during gas flow becomes smaller, and the energy consumed is smaller; the larger branch flow path increases the flow of the pipeline and improves the energy of gas flow, and because the cross-sectional area of ​​the branch outlet is constant, the outlet pressure is increased. By increasing the size of the outlet pressure, the phenomenon of excessive pressure difference is effectively eliminated, thereby assisting the laser cutting equipment in meeting the air pressure requirements when cutting different plates and achieving the ideal cutting process requirements.

[0023] Table 1 Corresponding relationship between branch outlet cross-sectional area and pressure drop before nitrogen branch pressure drop improvement

[0024]

[0025] Table 2 Corresponding relationship between branch outlet cross-sectional area and pressure drop after nitrogen branch pressure drop improvement

[0026]

[0027] Table 3 Corresponding relationship between branch outlet cross-sectional area and pressure drop before air branch pressure drop improvement

[0028]

[0029] Table 4 Corresponding relationship between branch outlet cross-sectional area and pressure drop after air branch pressure drop improvement

[0030]

[0031] Table 5 Corresponding relationship between branch outlet cross-sectional area and pressure drop before oxygen branch pressure drop improvement

[0032]

[0033] Table 6 Corresponding relationship between branch outlet cross-sectional area and pressure drop after oxygen branch pressure drop improvement

[0034]

[0035] Although the present invention has been described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, and all of these shall be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A gas circuit device for reducing pressure drop in laser cutting, comprising a branch circuit (1), a valve seat (2) and a laser head (3), characterized in that: The branch lines (1) are provided with three branches, and a partition plate straight-through connector (4), a filter (5), a flow control valve (6) and a one-way valve (7) are installed on the branch lines (1) from left to right in sequence. A pressure switch (8) is also provided between the filter (5) and the flow control valve (6). The components on the branch lines (1) are internally connected. An electrical proportional valve (9) is also provided on one of the branch lines (1), and the electrical proportional valve (9) is located between the one-way valve (7) and the valve seat (2) of the branch line (1). The one-way valve (7) and the valve seat (2) are connected via an adapter with a sealing ring and a universal joint with a sealing ring; The end of the branch (1) away from the laser head (3) is connected to the gas storage tank, and the end of the branch (1) close to the gas storage tank is provided with a pressure gauge; The gas flowing in the branch (1) is nitrogen / air, and the gas flowing in the branch (1) with the electric proportional valve (9) is oxygen; When the minimum diameter of each branch for different gases is the set value and the intake pressure is between 20bar and 25bar, the branch flow path becomes larger, the resistance encountered by the gas during circulation becomes smaller, and the energy consumption becomes smaller; the larger branch flow path increases the flow of the pipeline and improves the energy of gas circulation. Because the cross-sectional area of ​​the branch outlet is constant, the outlet pressure is increased. By increasing the outlet pressure, the phenomenon of excessive pressure difference is effectively eliminated, and the air pressure requirements of the laser cutting equipment when cutting different plates are assisted to achieve the ideal cutting process requirements; The minimum diameter of the nitrogen branch (1) is 15 mm; The minimum diameter of the air branch (1) is 13 mm; The minimum diameter of the branch (1) for oxygen is 13 mm.

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