CN219957410U - Safety inspection machine - Google Patents

Abstract

The utility model provides a security inspection machine, comprising: the security inspection machine comprises a security inspection machine shell, wherein a security inspection channel is arranged in the security inspection machine shell; a radiation source disposed within the security inspection channel, the radiation source adapted to generate a radiation beam; the voltage doubling circuit box body is arranged in the security inspection machine shell, and is isolated from the security inspection channel so as to reduce the influence of vibration of the security inspection channel on the voltage doubling circuit box body, and insulating oil is filled in the voltage doubling circuit box body; the transformer, set up in the voltage doubling circuit box, be applicable to for the ray source provides the electric energy, the transformer includes: a magnetic core formed to close the magnetic path; a primary winding wound around a first arm of the frame of the magnetic core; a secondary winding wound on a second arm of the frame opposite to the first arm and isolated from the primary winding; and the epoxy resin layers are respectively wrapped on the primary winding and the secondary winding so as to isolate the primary winding and the secondary winding from insulating oil.

Description

Safety inspection machine

Technical Field

The utility model relates to a security inspection machine, in particular to a security inspection machine with a high-frequency high-voltage transformer.

Background

The security inspection X-ray machine mainly comprises an X-ray tube, an X-ray machine power supply, a control circuit and the like. Wherein the X-ray tube is composed of a cathode filament (Catpod) and an Anode target (Anode) and a vacuum glass tube. The power supply of the X-ray machine can be divided into a high-voltage power supply and a filament power supply, wherein the filament power supply is used for heating a filament, high-voltage output ends of the high-voltage power supply are respectively added at two ends of a cathode filament and an anode target, and a high-voltage electric field is provided to enable electrons active on the filament to accelerate to flow to the anode target, so that a high-speed electron flow is formed.

The conventional high-frequency transformer is generally a step-down transformer, the secondary voltage is generally lower than 300V, and the insulation requirement is not high. Compared with the conventional high-frequency transformer, the high-frequency transformer in the security inspection machine is a step-up transformer and has the characteristics of high frequency and high voltage. The common switching frequency is between 20KHz and 100KHz, the voltage of the secondary side is 5-10 times that of the primary side, the voltage reaches more than 10KV, and the primary and secondary insulation requirements are high.

The high-frequency high-voltage transformer in the current security inspection machine is directly placed in air or insulating oil. The high-voltage transformer placed in the air is extremely easy to be influenced by dust, humidity and the like, and the normal operation of the transformer is influenced by long-term use. The transformer placed in the insulating oil can generate residues such as metal oxide and the like after long-term use of the insulating oil, so that the oil quality is poor, and the normal operation of the transformer is affected. On the other hand, after long-term use, the viscosity of the transformer is more and more viscous, so that heat dissipation is difficult, and the service life of the transformer is influenced. In this process, the interfacial tension of the oil product is also reduced, which means that the quality of the oil product is deteriorated, with various metal oxides or other residues, and the safety factor of the operation of the equipment is relatively reduced. In addition, the volume, the size and the weight of the detected objects in the security inspection machine are different, the conveyor belt of the security inspection channel is in a variable load working condition in the working process, the stress transmission speed of the conveyor belt is a variable, and the vibration frequency of the transmission device is also a variable. The sealing of the insulating oil tank is influenced by the changed vibration, once the insulating oil tank leaks, the liquid level drops, and the primary winding and the secondary winding of the transformer are possibly discharged to cause the burning of the transformer, so that the security inspection machine cannot work continuously, and the normal operation of the security inspection work is influenced.

Disclosure of Invention

To solve at least one technical problem of the above or other aspects, an embodiment of the present utility model provides a security inspection machine for a high-frequency and high-voltage transformer, which can improve the stability of the transformer by placing a primary winding and a secondary winding coated with an epoxy resin layer in insulating oil and by isolating the primary winding and the secondary winding from a security inspection channel.

The embodiment of the utility model provides a security inspection machine, which comprises:

the security inspection machine comprises a security inspection machine shell, wherein a security inspection channel is arranged in the security inspection machine shell;

one or two radiation sources disposed within the security screening channel, the radiation sources adapted to generate a beam of radiation;

the voltage doubling circuit box body is arranged in the security inspection machine shell, and is isolated from the security inspection channel so as to reduce the influence of vibration of the security inspection channel on the voltage doubling circuit box body, and insulating oil is filled in the voltage doubling circuit box body; and

the transformer, set up in the voltage doubling circuit box is applicable to for the ray source provides the electric energy, the transformer includes:

a magnetic core formed to close the magnetic path;

a primary winding wound around a first arm of a frame of the magnetic core;

a secondary winding wound around a second arm of the frame opposite to the first arm

Isolated from the primary winding; and

and the epoxy resin layers are respectively wrapped on the primary winding and the secondary winding so as to isolate the primary winding and the secondary winding from the insulating oil.

According to some embodiments of the utility model, the voltage doubling circuit box is further provided with:

the voltage doubling circuit board is arranged in the voltage doubling circuit box body, and a voltage doubling rectifying circuit which is suitable for rectifying the voltage output by the secondary winding is arranged on the voltage doubling circuit board.

According to some embodiments of the utility model, the security inspection machine further comprises:

the installing support is arranged in the security inspection machine shell, the voltage doubling circuit box body is arranged on the installing support, and the installing support is isolated from the security inspection channel.

According to some embodiments of the utility model, the security inspection machine further comprises:

and the shock insulation pad is arranged between the mounting bracket and the voltage doubling circuit box body so as to reduce the influence of vibration of the security inspection channel on the voltage doubling circuit box.

According to some embodiments of the utility model, the core comprises two U-cores that butt-joint at the opening to form a closed magnetic path.

According to some embodiments of the utility model, the transformer further comprises:

and the two frameworks are respectively sleeved on the two U-shaped cores, and the epoxy resin layer is coated on the frameworks.

According to some embodiments of the utility model, a spacing between the epoxy layer outside the primary winding and the epoxy layer outside the secondary winding is greater than or equal to 1mm.

According to some embodiments of the utility model, a liquid level meter is arranged on the voltage doubling circuit box body, and the liquid level meter is used for measuring the liquid level surface height of insulating oil in the voltage doubling circuit box body.

According to some embodiments of the utility model, the security inspection machine further comprises:

an alarm is arranged on the security inspection machine shell and is configured to send out an alarm signal after the height of the liquid level surface is lower than a preset threshold value.

According to some embodiments of the utility model, the epoxy layer is a thermally conductive epoxy

According to some embodiments of the utility model, the thickness of the epoxy layer is greater than or equal to 2mm.

According to the security inspection machine provided by the embodiment of the utility model, the primary winding and the secondary winding are respectively coated by the epoxy resin layer and are isolated in space, and then the primary winding and the secondary winding are integrally soaked in the insulating oil, so that the heat dissipation capacity of the transformer is improved, the risk of direct burning of the transformer after the insulating oil leaks is reduced, and the leakage of an insulating oil tank due to the vibration influence of a security inspection channel is avoided.

Drawings

FIG. 1 schematically illustrates an internal structural perspective view of a security inspection machine according to an embodiment of the present utility model;

FIG. 2 is an internal structural view of a voltage doubling circuit box of the security inspection machine shown in FIG. 1; and

fig. 3 is a perspective view of a transformer of the voltage doubling circuit box shown in fig. 2.

In the drawings, the reference numerals specifically have the following meanings:

1-a security inspection machine shell;

2-a security inspection channel;

3-voltage doubling circuit box body;

a 4-transformer;

401-a magnetic core;

402-primary winding;

403-secondary winding;

404-an epoxy layer;

5-mounting a bracket;

6-insulating oil; and

7-a control circuit box body.

Detailed Description

The present utility model will be further described in detail below with reference to specific embodiments and with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present utility model more apparent.

It should be understood that the description is only illustrative and is not intended to limit the scope of the utility model. In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the utility model. It may be evident, however, that one or more embodiments may be practiced without these specific details. In the following description, descriptions of well-known techniques are omitted so as not to unnecessarily obscure the concept of the present utility model.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "comprising" as used herein indicates the presence of a feature, step, operation, but does not preclude the presence or addition of one or more other features.

All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. It should be noted that the terms used herein should be construed to have meanings consistent with the context of the present specification and should not be construed in an idealized or overly formal manner.

Where expressions like at least one of "A, B and C, etc. are used, the expressions should generally be interpreted in accordance with the meaning as commonly understood by those skilled in the art (e.g.," a system having at least one of A, B and C "shall include, but not be limited to, a system having a alone, B alone, C alone, a and B together, a and C together, B and C together, and/or A, B, C together, etc.). Where a formulation similar to at least one of "A, B or C, etc." is used, in general such a formulation should be interpreted in accordance with the ordinary understanding of one skilled in the art (e.g. "a system with at least one of A, B or C" would include but not be limited to systems with a alone, B alone, C alone, a and B together, a and C together, B and C together, and/or A, B, C together, etc.).

FIG. 1 schematically illustrates an internal structural perspective view of a security inspection machine according to an embodiment of the present utility model; FIG. 2 is an internal structural view of a voltage doubling circuit box of the security inspection machine shown in FIG. 1; fig. 3 is a perspective view of a transformer of the voltage doubling circuit box shown in fig. 2.

In order to solve the technical problems, the utility model provides a security inspection machine, which comprises a security inspection machine shell 1, a security inspection channel 2, a radiation source, a voltage doubling circuit box 3 and a transformer 4 as shown in fig. 1 to 3. The inside of the security inspection machine shell 1 is provided with a security inspection channel 2. One or two radiation sources are arranged in the security screening channel 2, which are adapted to generate a radiation beam. The voltage doubling circuit box 3 is arranged in the security inspection machine shell 1, the voltage doubling circuit box 3 is isolated from the security inspection channel 2, so that the influence of vibration of the security inspection channel 2 on the voltage doubling circuit box 3 is reduced, and insulating oil 6 is filled in the voltage doubling circuit box 4. A transformer 4 is arranged in the voltage doubling circuit box 3 and is adapted to provide power to the radiation source, the transformer 4 comprising a magnetic core 401, a primary winding 402, a secondary winding 403 and an epoxy layer 404. The magnetic core 401 is formed to close a magnetic path; the primary winding 402 is wound on a first arm of the frame of the magnetic core 401; the secondary winding 403 is wound on a second arm of the frame of the magnetic core 401 opposite to the first arm and is isolated from the primary winding 401; an epoxy layer 404 is wrapped around the primary winding 401 and the secondary winding 402, respectively, to isolate the primary winding 401, the secondary winding 402 from the insulating oil 6, the epoxy layer 404 being a thermally conductive epoxy.

In this embodiment, the primary winding 401 and the secondary winding 402 are respectively covered by the epoxy resin layer 404 and are spatially isolated, and then the primary winding 401 and the secondary winding 402 are integrally immersed in the insulating oil 6, so that the heat dissipation capability of the transformer is improved, the risk of direct burnout of the transformer after the insulating oil 6 leaks is reduced, and the leakage of the insulating oil tank (voltage doubling circuit box 3) due to the vibration influence of the security inspection channel 2 is avoided.

According to some embodiments of the present utility model, the security inspection machine housing 1 forms a receiving space for mounting and protecting the functional components therein. The security inspection machine comprises a security inspection machine shell 1, wherein a security inspection channel 2 is arranged in the security inspection machine shell 1, and optionally, the security inspection channel 2 comprises a belt conveyor, wherein security inspection inlets and security inspection outlets which are communicated with two ends of the belt conveyor are respectively formed in two ends of the security inspection machine shell 1, a radiation source is arranged in the security inspection channel 2, and objects to be inspected are imaged by emitting radiation beams so as to facilitate inspection by workers.

According to some embodiments of the present utility model, a control circuit box 7 is disposed in the security inspection machine housing 1, and components and circuits for controlling the security inspection machine to operate normally are disposed in the control circuit box 7, which is not described in detail herein.

According to some embodiments of the present utility model, the voltage doubling circuit box 3 is disposed in the security inspection machine housing 1 at a position far away from the security inspection channel 2, so as to reduce the influence of vibration of the security inspection channel 2 on the sealing structure of the voltage doubling circuit box 3, for example, prevent the sealing ring from being damaged by fatigue under the influence of vibration to cause sealing failure, so that insulating oil in the voltage doubling circuit box 3 leaks, and the transformer 4 cannot work normally.

According to some embodiments of the present utility model, a voltage doubling circuit board is further disposed in the voltage doubling circuit box 3, the voltage doubling circuit board is soaked in the insulating oil 6, and a voltage doubling rectifying circuit suitable for rectifying the voltage output by the secondary winding is disposed on the voltage doubling circuit board.

According to some embodiments of the present utility model, the transformer 4 further includes two bobbins respectively sleeved on the first arm and the second arm, and the primary winding 402 and the secondary winding 403 are respectively wound on the two bobbins. After the primary winding 402 and the secondary winding 403 are wound, epoxy resin is poured, wherein the die is made of a high-hardness steel plate, and the internal draft angle is 2-3 degrees, so that the transformer is demolded after pouring, and the pouring method comprises the following steps:

(1) Placing the wound magnetic core, the wound framework and the wound windings into a mold and fixing the wound magnetic core, the wound framework and the wound windings;

(2) Drying the assembled mould;

(3) Mixing the two-component epoxy resin glue in proportion, degassing, and injecting into a mold;

(4) Heating the mold to cure the epoxy resin, and slowly reducing the temperature to room temperature after the strength of the epoxy resin reaches the preset strength;

(5) Standing the transformer, cooling to room temperature, and removing the mold;

(6) And testing the electrical performance of the transformer.

According to some embodiments of the utility model, the mold in step (1) wraps only the armature and portions of the core and windings inside and outside the armature.

According to some embodiments of the utility model, drying the assembled mold includes placing the mold into a drying oven for drying. Optionally, the temperature of the drying oven is set to be 80-100 ℃ and the drying time is 2-4 hours.

According to some embodiments of the utility model, the degassing treatment of the mixed epoxy glue includes vibration degassing and vacuum degassing. Optionally, the container for containing the epoxy resin glue is vibrated at high frequency by the vibrator, so that the gas generated by the reaction in the epoxy resin glue and the dissolved or carried-in gas in the mixing process overflow. Optionally, the container for containing the epoxy resin glue is placed in a vacuum chamber, vacuum is pumped out, and the gas generated by the reaction in the epoxy resin glue and the dissolved or carried gas in the mixing process are pumped out through negative pressure. Alternatively, the two schemes may be combined, that is, the vacuum degassing is performed by vibration degassing.

According to alternative embodiments of the present utility model, the mold is heated in the temperature range of 130-150 ℃. Optionally, the heating time is 2-4 hours. Optionally, after the epoxy strength reaches the preset strength, slowly reducing the temperature to room temperature within 0.5-1 hour.

According to alternative embodiments of the present utility model, the mold is placed in a vacuum chamber and heated. Alternatively, the epoxy resin in the mold may be evacuated and degassed, then taken out, and the vacuum is broken and then the heating treatment is performed.

In the embodiment, split casting is adopted, and only the winding and the framework are cast. The epoxy resin adhesive adopts bi-component heat-conducting epoxy resin, the withstand voltage exceeds 28kV/mm, the heat-resistant grade is F grade or above, the heat conductivity coefficient is more than 0.8W/m.K, and the dielectric loss tan sigma is less than or equal to 0.003. All structural members of the winding framework are made of glass fiber reinforced plastics, and the thickness of the winding framework is more than or equal to 3mm. The magnetic core is made of manganese-zinc ferrite magnetic core or iron-based amorphous magnetic core, two magnetic cores are generally used, the two magnetic cores are butted to form a square-shaped closed magnetic path, and iron hoops are adopted to be fixed along the outer edge of the square-shaped magnetic core. Optionally, leads (primary and secondary leads) are connected to the primary winding 401 and the secondary winding 402, and the leads are stranded copper wires.

The winding method of the winding also comprises the following steps: the primary winding is wound on a bobbin, and the primary winding voltage is low, typically around 300V. And winding the primary and secondary insulating layers by using a polyester film after finishing, wherein the thickness is more than or equal to 2mm. The secondary winding has high voltage, the highest voltage is positioned at the outermost layer of the winding, the voltage is generally about 11KV, and the secondary winding is wound on the other skeleton. Winding is needed in a sectional mode. And a region of the grounding wire on the framework is divided into 4 sections by using a Mala adhesive tape. Alternatively, the number of segments can be adjusted as desired, with a typical number of segments divided into 2-10 segments. And after the secondary winding is wound, a polyester film is adopted to wind a secondary high-voltage insulating layer, and the thickness is more than or equal to 2mm.

According to some embodiments of the utility model, the security inspection machine further comprises a mounting bracket 5, the mounting bracket 5 is arranged in the security inspection machine shell 1, the voltage doubling circuit box 3 is arranged on the mounting bracket 5, and the mounting bracket 5 is arranged in a separated mode from the security inspection channel 2.

According to some embodiments of the present utility model, the security inspection machine further includes a shock insulation pad disposed between the mounting bracket 5 and the voltage doubling circuit box 3, so as to reduce the influence of the vibration of the security inspection channel 2 on the voltage doubling circuit box 3.

According to some embodiments of the utility model, core 401 includes two U-cores that butt together at an opening to form a closed magnetic path.

According to some embodiments of the present utility model, the distance between the epoxy resin layer outside the primary winding and the epoxy resin layer outside the secondary winding is greater than or equal to 1mm, so as to ensure that the insulating oil can smoothly pass through the gap between the epoxy resin layer 404 outside the primary winding 401 and the secondary winding 402, and take away heat to cool.

According to some embodiments of the present utility model, the voltage doubling circuit box 3 is provided with a liquid level meter, and the liquid level meter is used for measuring the height of the liquid level surface of the insulating oil 6 in the voltage doubling circuit box 3. The staff can observe whether the voltage doubling circuit box 3 leaks oil through the level gauge in real time.

According to some embodiments of the utility model, the safety inspection machine further comprises an alarm arranged on the safety inspection machine housing 1, the alarm being configured to emit an alarm signal in response to the level surface height being below a preset threshold value. Staff can know after receiving alarm signal that voltage doubling circuit box 3 has leaked, adopts epoxy and insulating oil double insulation's design based on the transformer to can not directly lead to the burning out of transformer. Generally, the voltage doubling circuit box 3 can still continue to work for a period of time after leakage of insulating oil, can give staff sufficient time to adjust, for example, drain the staff of security inspection passageway, call the accessory and arrange maintenance personal to enter the field etc., can discharge insulating oil leakage and burn out the stop pendulum that the transformer leads to security inspection work, reduce the risk.

According to some embodiments of the present utility model, the thickness of the epoxy layer 404 is greater than or equal to 2mm to ensure insulation between the primary winding 401 and the secondary winding 402.

Thus, embodiments of the present utility model have been described in detail with reference to the accompanying drawings. It should be noted that, in the drawings or the text of the specification, implementations not shown or described are all forms known to those of ordinary skill in the art, and not described in detail. Furthermore, the above definitions of the components are not limited to the specific structures, shapes or modes mentioned in the embodiments, and may be simply modified or replaced by those of ordinary skill in the art.

It should also be noted that in the embodiments of the present utility model, unless otherwise known, numerical parameters in the present specification and attached claims are approximations that may vary depending upon the desired properties sought to be obtained by the present utility model. In particular, all numbers expressing dimensions, range conditions, and so forth, used in the specification and claims are to be understood as being modified in all instances by the term "about". In general, the meaning of expression is meant to include a variation of + -10% in some embodiments, a variation of + -5% in some embodiments, a variation of + -1% in some embodiments, and a variation of + -0.5% in some embodiments by a particular amount.

Those skilled in the art will appreciate that the features recited in the various embodiments of the utility model and/or in the claims may be combined in various combinations and/or combinations, even if such combinations or combinations are not explicitly recited in the utility model. In particular, the features recited in the various embodiments of the utility model and/or in the claims can be combined in various combinations and/or combinations without departing from the spirit and teachings of the utility model. All such combinations and/or combinations fall within the scope of the utility model.

The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the utility model, and is not meant to limit the utility model thereto, but to limit the utility model thereto, and any modifications, equivalents, improvements and equivalents thereof may be made without departing from the spirit and principles of the utility model.

Claims (11)

1. A security inspection machine, comprising:

the security inspection machine comprises a security inspection machine shell, wherein a security inspection channel is arranged in the security inspection machine shell;

a radiation source disposed within the security screening channel, the radiation source adapted to generate a radiation beam;

the voltage doubling circuit box body is arranged in the security inspection machine shell, and is isolated from the security inspection channel so as to reduce the influence of vibration of the security inspection channel on the voltage doubling circuit box body, and insulating oil is filled in the voltage doubling circuit box body; and

the transformer, set up in the voltage doubling circuit box is applicable to for the ray source provides the electric energy, the transformer includes:

a magnetic core formed to close the magnetic path;

a primary winding wound around a first arm of a frame of the magnetic core;

a secondary winding wound on a second arm of the frame opposite to the first arm and isolated from the primary winding; and

and the epoxy resin layers are respectively wrapped on the primary winding and the secondary winding so as to isolate the primary winding and the secondary winding from the insulating oil.

2. The security inspection machine of claim 1, wherein the voltage doubling circuit box body is further provided with:

the voltage doubling circuit board is arranged in the voltage doubling circuit box body, and a voltage doubling rectifying circuit which is suitable for rectifying the voltage output by the secondary winding is arranged on the voltage doubling circuit board.

3. The security inspection machine of claim 1, further comprising within the machine:

the installing support is arranged in the security inspection machine shell, the voltage doubling circuit box body is arranged on the installing support, and the installing support is isolated from the security inspection channel.

4. A security inspection machine according to claim 3, further comprising within the machine:

and the shock insulation pad is arranged between the mounting bracket and the voltage doubling circuit box body so as to reduce the influence of vibration of the security inspection channel on the voltage doubling circuit box.

5. The security inspection machine of claim 1 wherein the magnetic core comprises two U-cores, the two U-cores abutting at an opening to form a closed magnetic path.

6. The security inspection machine of claim 5, wherein the transformer further comprises:

and the two frameworks are respectively sleeved on the two U-shaped cores, and the epoxy resin layer is coated on the frameworks.

7. The machine of claim 6, wherein a spacing between the epoxy layer outside the primary winding and the epoxy layer outside the secondary winding is greater than or equal to 1mm.

8. The security inspection machine of claim 1, wherein a liquid level meter is arranged on the voltage doubling circuit box body and is used for measuring the height of a liquid level surface of insulating oil in the voltage doubling circuit box body.

9. The security inspection machine of claim 8, further comprising:

an alarm is arranged on the security inspection machine shell and is configured to send out an alarm signal after the height of the liquid level surface is lower than a preset threshold value.

10. The security inspection machine of claim 1, wherein the epoxy layer is a thermally conductive epoxy.

11. The security inspection machine of claim 1, wherein the thickness of the epoxy layer is greater than or equal to 2mm.