Electromagnetic compatibility processing device of nitrogen making machine

Abstract

The utility model relates to a nitrogen making machine electromagnetic compatibility processing device, which comprises a device body, and the device body comprises a nitrogen making machine shell. The shielding box is provided with an accommodating chamber and comprises a shielding box body and a shielding box cover which are mutually occluded and sealed, and a conductive rubber strip is arranged between the contact surfaces of the shielding box body and the shielding box cover; the filtering assembly is arranged in the shielding box accommodating chamber and comprises a common mode inductor and a high-frequency decoupling capacitor; the common mode inductor is arranged in the shielding box, the interface assembly is exposed on the side wall of the shielding box, the interface assembly comprises an input interface and an output interface which are oppositely arranged, the input interface comprises an aviation socket, the output interface comprises a feed-through filter, the aviation socket is connected with the common mode inductor, and the common mode inductor is connected with the feed-through filter. According to the nitrogen making machine equipment, the anti-interference performance can be improved, and meanwhile, the external interference capability of the nitrogen making machine serving as a disturbance source is also reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic shielding, in particular to an electromagnetic compatibility processing device for a nitrogen generator. Background Art

[0002] In the field of nitrogen generators, product electromagnetic compatibility is one of the important issues that need to be considered when designing products. With the diversification of power sources, nitrogen generator control systems have put forward higher requirements for product electromagnetic compatibility. The three elements that constitute electromagnetic interference are electromagnetic disturbance sources, transmission paths, and sensitive equipment. The current basic control technologies for electromagnetic compatibility include grounding technology, filtering technology, and shielding technology. The main process for improving the electromagnetic compatibility of products on the market through shielding technology is electric field shielding. That is, the transmission path of radiated electromagnetic noise along the space is cut off, and the area to be shielded is surrounded by metal materials or magnetic materials, so that the "fields" inside and outside the shielding body are isolated from each other, thereby achieving electric field shielding.

[0003] However, in the prior art, the aviation socket for power supply of the nitrogen generator is directly installed on the outer shell of the nitrogen generator. The contact surface between the aviation socket and the housing of the nitrogen generator is small, and the housing of the nitrogen generator needs to be painted. There are paint residues on the mounting hole of the aviation socket and the installation position of the aviation socket, which affects the grounding of the system. At the same time, the aviation socket is directly installed on the outer shell of the nitrogen generator, which limits the space at the tail of the aviation socket, resulting in great difficulty in wiring and welding the filter capacitor. In addition, the wire at the tail of the aviation socket is exposed in the inner cavity of the nitrogen generator. Although the tail of the aviation socket is connected to a filter device, there is still a certain distance between the filter device and the tail of the aviation socket. When the nitrogen generator is operating normally, the oil-free air compressor, solenoid valve, controller, etc. are placed in the same cavity. Since the above devices can generate electromagnetic waves, they are coupled and interfered with each other on the wire between the filter device and the tail of the aviation socket, resulting in electromagnetic leakage inside the shell.

[0004] It can be seen that how to design an electromagnetic compatibility processing device for a nitrogen generator that can improve the anti-interference performance and reduce the ability of the nitrogen generator as a disturbance source to cause external interference is crucial. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides an electromagnetic compatibility processing device for a nitrogen generator, including a device body, the device body is installed inside a housing of the nitrogen generator, and the device body includes:

[0006] A shielding box with a receiving chamber, the shielding box comprising a shielding box body and a shielding box cover which are mutually engaged and sealed, and a conductive rubber strip is arranged between the contact surfaces of the shielding box body and the shielding box cover;

[0007] A filter component built into the shielding box receiving chamber, the filter component comprising a common mode inductor and a high frequency decoupling capacitor; and

[0008] An interface component exposed on the side wall of the shielding box, the interface component includes an input interface and an output interface that are relatively arranged, wherein the input interface includes an aviation socket, the output interface includes a feed-through filter, the aviation socket is connected to the common-mode inductor, and the common-mode inductor is connected to the feed-through filter.

[0009] Furthermore, the contact surfaces of the shielding box body and the shielding box cover are respectively provided with protrusions and grooves that engage with each other, and the grooves are filled with the conductive rubber strips.

[0010] Furthermore, the shielding box body and the shielding box cover are sealed and fixed by screws.

[0011] Furthermore, the shielding box is made of an aluminum plate with high conductivity.

[0012] Furthermore, the shielding box is fixed to the nitrogen generator housing by means of rivet nuts cooperating with the shielding box mounting holes.

[0013] Furthermore, the aviation socket is fixed to the shielding box body by means of a rivet nut and an aviation socket mounting hole, and the nitrogen generator housing is provided with a hole of the same size as the aviation socket base so that the shielding box can be installed close to the nitrogen generator housing.

[0014] Furthermore, a conductive rubber pad is provided between the contact surfaces of the aviation socket and the shielding box body.

[0015] Furthermore, the feed-through filter is fixed to the side wall of the shielding box body through inner and outer nuts.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] The utility model effectively avoids the electromagnetic influence of the external environment on the inside of the shielding box through the design of the shielding box;

[0018] By installing the aviation socket on the shielding box and directly installing the entire shielding box on the housing of the nitrogen generator, the contact area of ​​the system grounding is increased, and the high-frequency signal is effectively suppressed; by placing an electromagnetic compatibility filtering component inside the shielding box, the common-mode signal interference and the high-frequency clock frequency and its harmonics are effectively filtered out; by designing that the shielding box is connected to the internal circuit of the nitrogen generator through the feed-through filter on the shielding box, it can be ensured that the electromagnetic coupling between the internal control board and other devices of the nitrogen generator and the internal circuit of the shielding box can be effectively reduced when the nitrogen generator is running, and the interference signal can be prevented from being transmitted to the outside of the nitrogen generator along the power supply line without affecting the performance of the nitrogen generator; that is, the utility model enables the nitrogen generator equipment to improve the anti-interference performance, and also reduces the external interference ability of the nitrogen generator as a disturbance source. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 An exploded view of an embodiment of the utility model;

[0020] Figure 2 It is a schematic diagram of the overall structure of an embodiment of the utility model;

[0021] Figure 3 A top view of a shielding box body according to an embodiment of the utility model;

[0022] Figure 4 A bottom view of the shielding box cover of an embodiment of the utility model;

[0023] Figure 5 This is a schematic diagram of the installation position of the aviation socket according to an embodiment of the utility model.

[0024] In the figure: 100, device body; 110, shielding box; 1100, shielding box mounting hole; 111, shielding box body; 1110, protrusion; 112, shielding box cover; 1120, groove; 1121, conductive rubber strip; 120, filter component; 121, common mode inductor; 122, high-frequency decoupling capacitor; 130, interface component; 131, aviation socket; 1310, aviation socket mounting hole; 1311, conductive rubber pad; 132, feed-through filter. DETAILED DESCRIPTION

[0025] In order to make the technical scheme and technical effect of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments.

[0026] The utility model aims to provide an electromagnetic compatibility processing device for a nitrogen generator, so that the nitrogen generator equipment can improve the anti-interference performance and reduce the external interference capability of the nitrogen generator as a disturbance source to meet the requirements of corresponding industry standards.

[0027] Example

[0028] like Figure 1-3 As shown, the electromagnetic compatibility processing device for nitrogen generator mainly includes a device body 100, which is installed inside the housing of the nitrogen generator. The device body 100 mainly includes a shielding box 110 with a receiving chamber, a filter component 120 built into the receiving chamber of the shielding box 110, and an interface component 130 exposed on the side wall of the shielding box 110. Specifically:

[0029] The shielding box 110 is made of an aluminum plate with high conductivity and serves as the system grounding of the nitrogen generator. The shielding box 110 includes a shielding box body 111 and a shielding box cover 112 that are mutually engaged and sealed, and a conductive rubber strip 1121 is provided between the contact surfaces of the shielding box body 111 and the shielding box cover 112. Preferably, the contact surfaces of the shielding box body 111 and the shielding box cover 112 are respectively provided with mutually engaged protrusions 1110 and grooves 1120, and a conductive rubber strip 1121 is provided in the groove 1120. The shielding box body 111 and the shielding box cover 112 are sealed and fixed by screws. The advantage of this design is that the shielding box cover 112 has a groove 1120 that changes the leakage path of the electromagnetic wave, and the conductive rubber strip 1121 is added to fill the gap between the shielding box body 111 and the shielding box cover 112, so as to achieve effective electrical contact between the two, reduce high-frequency electromagnetic leakage at the joint, and also avoid the electromagnetic influence of the external environment on the inside of the shielding box 110.

[0030] The filter component 120 includes a common-mode inductor 121 and a high-frequency decoupling capacitor 122 . The common-mode inductor 121 and the high-frequency decoupling capacitor 122 are designed to filter out common-mode signal interference and high-frequency clock frequency and its harmonics.

[0031] The interface component 130 includes an input interface and an output interface that are relatively arranged, wherein the input interface includes an aviation socket 131, and the output interface includes a feed-through filter 132. The aviation socket 131 is connected to the common-mode inductor 121, and the common-mode inductor 121 is connected to the feed-through filter 132, thereby shortening the length of the power supply line and effectively reducing the influence of line coupling.

[0032] like Figure 4-5 As shown, the nitrogen generator housing is provided with a hole of the same size as the base of the aviation socket 131 so that the shielding box 110 can be installed close to the nitrogen generator housing; the aviation socket 131 is fixed to the shielding box body 111 through a rivet nut in conjunction with the aviation socket mounting hole 1310. The shielding box 110 is fixed to the nitrogen generator housing through a rivet nut in conjunction with the shielding box mounting hole 1100.

[0033] Different from the aviation socket being directly installed on the nitrogen generator housing, the utility model installs the aviation socket 131 on the shielding box 110 in advance, and then opens a hole in the nitrogen generator housing that is the same size as the base of the aviation socket 131, installs the entire shielding box 110 close to the nitrogen generator housing, and then fixes it through the shielding box mounting hole 1100. This design increases the contact area of ​​the system grounding and suppresses high-frequency signals; the mounting hole on the shielding box 110 uses a pressure rivet nut, and it only needs to be installed from the outside of the nitrogen generator.

[0034] A conductive rubber pad 1311 is provided between the contact surfaces of the aviation socket 131 and the shielding box body 111 to ensure effective electrical contact and airtightness between the two, prevent electromagnetic leakage at the interface, and optimize the electromagnetic compatibility performance of the nitrogen generator.

[0035] The feed-through filter 132 is fixed to the side wall of the shielding box body 111 through inner and outer nuts, which can effectively reduce the electromagnetic coupling between the internal control board and other components and the internal circuit of the shielding box device when the nitrogen generator is running.

[0036] The shielding box body 111 and the shielding box cover 112 in the present invention are sealed, the input interface is sealed by the aviation socket 131, and the output interface is sealed by the feed-through filter 132, ensuring that the entire shielding box 110 has a good electromagnetic shielding effect and effectively preventing electromagnetic waves in the external environment from entering the shielding box 110.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electromagnetic compatibility processing device for a nitrogen generator, characterized in that: The invention comprises a device body (100), wherein the device body (100) is installed inside a housing of a nitrogen generator, and the device body (100) comprises: A shielding box (110) having a receiving chamber, the shielding box (110) comprising a shielding box body (111) and a shielding box cover (112) which are mutually engaged and sealed, and a conductive rubber strip (1121) is provided between the contact surfaces of the shielding box body (111) and the shielding box cover (112); A filter assembly (120) built into the housing chamber of the shielding box (110), the filter assembly (120) comprising a common mode inductor (121) and a high frequency decoupling capacitor (122); and An interface component (130) exposed on the side wall of the shielding box (110), the interface component (130) comprising an input interface and an output interface arranged relatively to each other, wherein the input interface comprises an aviation socket (131), the output interface comprises a feed-through filter (132), the aviation socket (131) is connected to the common-mode inductor (121), and the common-mode inductor (121) is connected to the feed-through filter (132).

2. The electromagnetic compatibility processing device for nitrogen generator according to claim 1, characterized in that: The contact surfaces of the shielding box body (111) and the shielding box cover (112) are respectively provided with a protrusion (1110) and a groove (1120) that engage with each other, and the groove (1120) is filled with the conductive rubber strip (1121).

3. The electromagnetic compatibility processing device for nitrogen generator according to claim 1, characterized in that: The shielding box body (111) and the shielding box cover (112) are sealed and fixed by screws.

4. The electromagnetic compatibility processing device for nitrogen generator according to claim 1, characterized in that: The shielding box (110) is made of an aluminum plate with high conductivity.

5. The electromagnetic compatibility processing device for nitrogen generator according to claim 1, characterized in that: The aviation socket (131) is fixed to the shielding box body (111) by means of a rivet nut and an aviation socket mounting hole (1310), and the nitrogen generator housing is provided with a hole of the same size as the base of the aviation socket (131) so that the shielding box (110) can be mounted close to the nitrogen generator housing.

6. The electromagnetic compatibility processing device for nitrogen generator according to claim 5, characterized in that: The shielding box (110) is fixed to the nitrogen generator housing by means of a rivet nut in cooperation with the shielding box mounting hole (1100).

7. The electromagnetic compatibility processing device for nitrogen generator according to claim 6, characterized in that: A conductive rubber pad (1311) is provided between the contact surfaces of the aviation socket (131) and the shielding box body (111).

8. The electromagnetic compatibility processing device for nitrogen generator according to claim 1, characterized in that: The feed-through filter (132) is fixed to the side wall of the shielding box body (111) via inner and outer nuts.

Images