Air pressure control structure and equipment

Abstract

The utility model discloses an air pressure control structure and equipment, the equipment can be a laser cutter, the laser cutter comprises the air pressure control structure, and the air pressure control structure comprises an air outlet pipeline, a first air inlet pipeline and a second air inlet pipeline. Wherein the first air inlet pipeline is communicated with the air outlet pipeline, a first proportional valve is arranged on the first air inlet pipeline, the second air inlet pipeline is communicated with the air outlet pipeline, a second proportional valve is arranged on the second air inlet pipeline, and the working pressure of the first proportional valve is larger than that of the second proportional valve. According to the air pressure control structure and equipment, the problem that in the prior art, impurities easily block the proportional valve is solved.

Description

Technical Field

[0001] This application relates to the technical field of air pressure control, and more particularly, to an air pressure control structure and device. Background Art

[0002] In a laser cutting device, a proportional valve is used to control the pressure of the gas flowing into the laser cutting head. The laser cutting head usually uses gases such as oxygen, nitrogen or air for cutting. When the laser cutting head uses air or nitrogen for cutting, since there are certain impurities in the air or nitrogen, after the impurities enter the proportional valve, if the gas pressure in the proportional valve is too low, it is easy to cause the impurities to block the proportional valve. Summary of the Utility Model

[0003] The main purpose of this application is to provide a gas control structure and device to at least solve the problem of impurity blockage of the proportional valve in the prior art.

[0004] According to one aspect of this application, an air pressure control structure is provided, including:

[0005] An air outlet pipe;

[0006] A first air inlet pipe, the first air inlet pipe is communicated with the air outlet pipe, and a first proportional valve is arranged on the first air inlet pipe;

[0007] A second air inlet pipe, the second air inlet pipe is communicated with the air outlet pipe, and a second proportional valve is arranged on the second air inlet pipe;

[0008] Wherein, the working pressure of the first proportional valve is greater than the working pressure of the second proportional valve.

[0009] Furthermore, the air pressure control structure includes a control valve, the control valve is at least arranged on the second air inlet pipe and is located at the output end of the second proportional valve, and the control valve is used to prevent the gas flowing out of the first proportional valve from entering the second proportional valve.

[0010] Furthermore, the control valve includes a first check valve and a second check valve. The first check valve is arranged on the first air inlet pipe and is located at the output end of the first proportional valve. The second check valve is arranged on the second air inlet pipe and is located at the output end of the second proportional valve.

[0011] Furthermore, the air pressure control structure further includes a tee pipe. The tee pipe includes a first pipe, a second pipe and a third pipe that are communicated with each other. The first pipe forms the air outlet pipe, the second pipe forms the first air inlet pipe, and the third pipe forms the second air inlet pipe.

[0012] Further, the first proportional valve is a high-pressure valve, and the air pressure adjustment range P1 of the first proportional valve satisfies the relational expression: 0 ≤ P1 ≤ 3 Mpa; and / or,

[0013] The second proportional valve is a low-pressure valve, and the air pressure adjustment range P2 of the second proportional valve satisfies the relational expression: 0 ≤ P2 ≤ 0.5 Mpa.

[0014] Further, the first proportional valve and / or the second proportional valve includes a servo proportional valve.

[0015] Further, the air pressure control structure further includes a control module, the control module is electrically connected to the first proportional valve and the second proportional valve respectively, and the control module is used to control the first proportional valve and the second proportional valve.

[0016] Further, the control module includes a voltage-current conversion element, the voltage-current conversion element is electrically connected to the first proportional valve and the second proportional valve, and the voltage-current conversion element is used to convert voltage into current and control the first proportional valve and the second proportional valve with the current.

[0017] On the other hand, the present application also provides a device, and the device includes the above-mentioned air pressure control structure.

[0018] Further, the device includes a laser cutter.

[0019] Compared with the prior art, in the present application, when the laser cutter needs to use gases such as air or nitrogen to cut materials, air and nitrogen can be connected to the first intake pipe. Since the working pressure of the first proportional valve is relatively high, impurities in the air or nitrogen will not affect the first proportional valve. That is, under the action of high pressure, the impurities in the air or nitrogen will be taken away together from the first proportional valve. Therefore, the impurities in the air or nitrogen will not cause the first proportional valve to be blocked. When the laser cutter needs to use oxygen to cut materials, oxygen can enter through the second intake pipe. Since the purity of oxygen is relatively high and there are almost no impurities in oxygen, even though the working pressure of the second proportional valve is relatively low, the second proportional valve will not be blocked after the second intake pipe is connected to oxygen. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0021] Figure 1 is a schematic structural diagram of the air pressure control structure disclosed in the present application;

[0022] Figure 2This is the schematic diagram of the air pressure control structure disclosed in the present application.

[0023] Among them, the above-mentioned drawings include the following reference numerals:

[0024] 10. First intake pipe; 11. First proportional valve; 20. Second intake pipe; 21. Second proportional valve; 30. Outlet pipe; 40. Control valve; 41. First one-way valve; 42. Second one-way valve. Detailed implementation manners

[0025] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0026] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary implementation manners according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "comprise" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0027] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for the sake of convenience of description, the sizes of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0028] See Figures 1 to 2 As shown, according to an embodiment of the present application, a device is provided. The device may be a laser cutter, and the laser cutter includes an air pressure control structure. The air pressure control structure includes an outlet pipe 30, a first intake pipe 10, and a second intake pipe 20.

[0029] Among them, the first intake pipe 10 is communicated with the outlet pipe 30, and a first proportional valve 11 is arranged on the first intake pipe 10. The second intake pipe 20 is communicated with the outlet pipe 30, and a second proportional valve 21 is arranged on the second intake pipe 20. The working pressure of the first proportional valve 11 is greater than that of the second proportional valve 21.

[0030] Specifically, in this embodiment, when the laser cutter needs to use gases such as air or nitrogen to cut materials, air and nitrogen can be connected to the first intake pipe 10. Since the working pressure of the first proportional valve 11 is relatively high, impurities in the air or nitrogen will not affect the first proportional valve 11. That is, under the action of high pressure, the impurities in the air or nitrogen will be carried away together from the first proportional valve 11. Therefore, the impurities in the air or nitrogen will not cause the first proportional valve 11 to be blocked. When the laser cutter needs to use, for example, oxygen to cut materials, oxygen can enter through the second intake pipe 20. Since the purity of oxygen is relatively high and there are almost no impurities in oxygen, even though the working pressure of the second proportional valve 21 is relatively low, the second proportional valve 21 will not be blocked after the second intake pipe is connected to oxygen. Therefore, the service life of the first proportional valve 11 and the second proportional valve 21 in the air pressure control structure of this embodiment is improved to a certain extent, and thus the use cost of the first proportional valve 11 and the second proportional valve 21 is reduced to a certain extent. In addition, in this embodiment, oxygen can also be connected to the first intake pipe 10. However, since the working pressure of the second proportional valve 21 is relatively low, the second intake pipe 20 is usually not connected to gases containing more impurities such as air or nitrogen to prevent the impurities from blocking the second proportional valve 21.

[0031] Since both the first intake pipe 10 and the second intake pipe 20 are communicated with the outlet pipe 30, when the first intake pipe 10 passes through gases containing more impurities such as air or nitrogen, the gas and impurities remaining in the first intake pipe 10 may flow into the second proportional valve 21 through the second intake pipe 20, thus causing the second proportional valve 21 to be blocked. To prevent impurities in the gas from entering the second proportional valve 21 through the second intake pipe 20 and causing the second proportional valve 21 to be blocked. In this embodiment, the air pressure control structure includes a control valve 40. The control valve 40 is at least arranged on the second intake pipe 20 and is located at the output end of the second proportional valve 21. The control valve 40 is used to prevent the gas flowing out of the first proportional valve 11 from entering the second proportional valve 21.

[0032] For example, when the control valve 40 is a switch valve, when the first intake pipe 10 passes through gas and the first proportional valve 11 works, and the second intake pipe 20 does not pass through gas, the switch valve is closed at this time, thereby preventing the air flow flowing out of the first proportional valve 11 from flowing into the second control valve 40, and further causing the second proportional valve 21 to be blocked.

[0033] Optionally, the control valve 40 includes a first one-way valve 41 and a second one-way valve 42. The first one-way valve 41 is disposed on the first intake air duct 10 and at the output end of the first proportional valve 11. The second one-way valve 42 is disposed on the second intake air duct 20 and at the output end of the second proportional valve 21.

[0034] Specifically, the first one-way valve 41 is disposed at the output end of the first proportional valve 11, and the second one-way valve 42 is disposed at the output end of the second proportional valve 21. That is, the air flow in the air outlet duct 30 or the second intake air duct 20 cannot enter the first proportional valve 11 under the action of the first one-way valve 41. Similarly, the air flow in the air outlet duct 30 or the first intake air duct 10 cannot enter the second proportional valve 21 under the action of the second one-way valve 42, thereby preventing the air flow flowing out of the first proportional valve 11 from flowing back into the first proportional valve 11 and contaminating the first proportional valve 11, or the air flow flowing out of the first proportional valve 11 from flowing into the second proportional valve 21 and contaminating the second proportional valve 21. At the same time, it prevents the air flow of the second proportional valve 21 from flowing back into the second proportional valve 21, contaminating the second proportional valve 21, or the air flow flowing out of the second proportional valve 21 from flowing into the first proportional valve 11 and contaminating the first proportional valve 11.

[0035] Furthermore, the air pressure control structure further includes a tee. The tee includes a first duct, a second duct, and a third duct that are interconnected. The first duct forms the air outlet duct 30, the second duct forms the first intake air duct 10, and the third duct forms the second intake air duct 20.

[0036] In this embodiment, since the first intake air duct 10 is the second duct and the second intake air duct 20 is the third duct, in the tee, the first intake air duct 10 and the second intake air duct 20 are interconnected. Therefore, the first one-way valve 41 is disposed at one end of the second duct close to the first duct, and the second one-way valve 42 is disposed at one end of the third duct close to the first duct. In addition, the setting of the tee makes the connection between the ducts flexible, and can effectively change the air flow direction of the gas entering the air outlet duct 30 from the first intake air duct 10 and the air flow direction of the gas entering the air outlet duct 30 from the second intake air duct 20.

[0037] Furthermore, the first proportional valve 11 is a high-pressure valve, and the air pressure adjustment range P1 of the first proportional valve 11 satisfies the relation: 0 ≤ P1 ≤ 3 Mpa.

[0038] Specifically, since the first proportional valve 11 usually needs to be fed with a gas containing more impurities such as air or nitrogen, the working pressure of the first proportional valve 11 should be relatively high to prevent the impurities in the air or nitrogen from clogging the first proportional valve 11. In the present embodiment, the working pressure of the first proportional valve 11 is usually between 10Mpa and 30Mpa. For example, when a laser cutter needs to cut large materials, if oxygen is passed into the laser cutter, the cost of laser cutting will be too high. At this time, the introduction of higher pressure air can reduce the cost to a certain extent, and the cutting efficiency will not be reduced too much. The working pressure of the first proportional valve 11 can be 10Mpa, 15Mpa, 20Mpa, 25Mpa and 30Mpa.

[0039] Furthermore, the second proportional valve 21 is a low-pressure valve, and the air pressure adjustment range P2 of the second proportional valve 21 satisfies the relationship: 0≤P2≤0.5Mpa.

[0040] When the laser cutter needs fine processing, such as fine cutting of steel sheets, the laser cutter needs to be fed with oxygen at a lower pressure. At this time, in order to reduce the pressure of oxygen, the oxygen is connected to the second air intake pipe 20. After the oxygen is adjusted by the second proportional valve 21, the oxygen pressure becomes the pressure required by the laser cutter. In this embodiment, the working pressure of the second proportional valve 21 is preferably 0.3Mpa and 0.5Mpa.

[0041] Furthermore, the first proportional valve 11 and / or the second proportional valve 21 include a servo proportional valve. Compared with an ordinary proportional valve, the servo proportional valve adds a motor or a torque motor, so that the servo proportional valve can be controlled with higher accuracy and faster response speed. It is worth mentioning that "the first proportional valve 11 and / or the second proportional valve 21 include a servo proportional valve" means that the first proportional valve 11 includes a servo proportional valve, the second proportional valve 21 includes a servo proportional valve, and the first proportional valve 11 and the second proportional valve 21 both include a servo proportional valve. In a specific embodiment, the first proportional valve 11 and the second proportional valve 21 are both servo proportional valves, so that the air pressure control structure can accurately control the pressure of the airflow.

[0042] Furthermore, the air pressure control structure further includes a control module (not shown in the figure), which is electrically connected to the first proportional valve 11 and the second proportional valve 21 respectively, and is used to control the first proportional valve 11 and the second proportional valve 21 .

[0043] Specifically, the first proportional valve 11 can adjust the air pressure inside the first proportional valve 11 through the control module, that is, the control module controls the opening of the air flow channel in the first proportional valve 11, and according to the size of the opening, the pressure of the gas in the first proportional valve 11 is changed. Similarly, the control module can adjust the opening size of the air flow channel in the second proportional valve 21, and further adjust the gas pressure in the second proportional valve 21. In a specific embodiment, when gas is introduced into the first intake pipe 10, the control module can control the second proportional valve 21 to close; when gas is introduced into the second intake pipe 20, the control module controls the first proportional valve 11 to close, so as to prevent the gas pressure flowing out of the outlet pipe 30 from being inconsistent with the predetermined pressure when the pressures of the first proportional valve 11 and the second proportional valve 21 are inconsistent. Of course, in some embodiments, the control module can also control the first proportional valve 11 and the second proportional valve 21 to open simultaneously, and different gases are respectively introduced into the first intake pipe 10 and the second intake pipe 20, so that the gases are mixed in the air pressure control structure.

[0044] Further, the control module includes a voltage-current conversion element, and the voltage-current conversion element is electrically connected to the first proportional valve 11 and the second proportional valve 21. The voltage-current conversion element is used to convert voltage into current and control the first proportional valve 11 and the second proportional valve 21 with the current.

[0045] Specifically, the existing control modules usually use voltage to control the proportional valve to adjust the working pressure of the proportional valve. However, the voltage is easily interfered by the external environment when input to the proportional valve. For example, an external magnetic field or electric field may cause a certain change in the magnitude of the voltage, ultimately resulting in inaccurate control of the proportional valve. In this embodiment, the control module includes a voltage-current conversion element. That is to say, after the voltage passes through the voltage-current conversion element, a specific magnitude of voltage outputs a specific magnitude of current, and the current is not easily interfered by the external environment. Therefore, using current to control the first proportional valve 11 and the second proportional valve 21 can improve the control accuracy of the air pressure control structure.

[0046] In summary, the present application sets a first air intake pipe 10 and a second air intake pipe 20, and the first air intake pipe 10 and the second air intake pipe 20 are both connected to the air outlet pipe 30, the first air intake pipe 10 is provided with a first proportional valve 11, the second air intake pipe 20 is provided with a second proportional valve 21, and the working pressure of the first proportional valve 11 is higher than the working pressure of the second proportional valve 21, therefore, when it is necessary to introduce a gas containing more impurities, the gas can be connected to the first air intake pipe 10, because the working pressure of the first proportional valve 11 is higher, the impurities in the gas will not cause the first proportional valve 11 to be blocked. In addition, in the present application, a first one-way valve 41 is also provided at the output end of the first proportional valve 11, and a second one-way valve 42 is provided at the output end of the second proportional valve 21, so as to prevent the gas in the air outlet pipe 30 from entering the first proportional valve 11 or the second proportional valve 21, causing pollution to the first proportional valve 11 or the second proportional valve 21. Finally, the control module of the present application includes a voltage-current conversion element, which converts voltage into current and uses the current to control the first proportional valve 11 and the second proportional valve 21, thereby improving the control accuracy of the first proportional valve 11 and the second proportional valve 21.

[0047] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0048] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0049] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A pneumatic control structure, characterized in that Including: An air outlet pipe (30); A first air inlet pipe (10), the first air inlet pipe (10) is communicated with the air outlet pipe (30), and a first proportional valve (11) is arranged on the first air inlet pipe (10); A second air inlet pipe (20), the second air inlet pipe (20) is communicated with the air outlet pipe (30), and a second proportional valve (21) is arranged on the second air inlet pipe (20); Wherein, the working pressure of the first proportional valve (11) is greater than the working pressure of the second proportional valve (21).

2. The air pressure control structure according to claim 1, wherein, The air pressure control structure includes a control valve (40), the control valve (40) is at least arranged on the second air inlet pipe (20) and is located at the output end of the second proportional valve (21), and the control valve (40) is used to prevent the gas flowing out of the first proportional valve (11) from entering the second proportional valve (21).

3. The air pressure control structure according to claim 2, wherein The control valve (40) includes a first check valve (41) and a second check valve (42), the first check valve (41) is arranged on the first air inlet pipe (10) and is located at the output end of the first proportional valve (11), and the second check valve (42) is arranged on the second air inlet pipe (20) and is located at the output end of the second proportional valve (21).

4. The air pressure control structure according to claim 1, characterized in that, The air pressure control structure further includes a tee pipe, the tee pipe includes a first pipe, a second pipe and a third pipe which are communicated with each other, the first pipe forms the air outlet pipe (30), the second pipe forms the first air inlet pipe (10), and the third pipe forms the second air inlet pipe (20).

5. The air pressure control structure according to claim 1, characterized in that, The first proportional valve (11) is a high-pressure valve, and the air pressure adjustment range P1 of the first proportional valve (11) satisfies the relation: 0≤P1≤3 Mpa; and / or, The second proportional valve (21) is a low-pressure valve, and the air pressure adjustment range P2 of the second proportional valve (21) satisfies the relation: 0≤P2≤0.5 Mpa.

6. The air pressure control structure according to any one of claims 1 to 5, characterized in that, The first proportional valve (11) and / or the second proportional valve (21) includes a servo proportional valve.

7. The air pressure control structure according to any one of claims 1 to 5, characterized in that, The air pressure control structure further includes a control module, the control module is electrically connected to the first proportional valve (11) and the second proportional valve (21) respectively, and the control module is used to control the first proportional valve (11) and the second proportional valve (21).

8. The air pressure control structure according to claim 7, wherein, The control module includes a voltage-current conversion element, the voltage-current conversion element is electrically connected to the first proportional valve (11) and the second proportional valve (21), and the voltage-current conversion element is used to convert voltage into current and control the first proportional valve (11) and the second proportional valve (21) with the current.

9. A device, characterized in that, The device includes the air pressure control structure according to any one of claims 1 to 8.

10. The device according to claim 9, characterized in that, The device includes a laser cutter.

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