Radiation source and security inspection machine

Abstract

The present invention provides a radiation source and an X-ray security inspection machine, relating to the technical field of electronic devices, and is used to solve the technical problem that it is difficult for the radiation source and the X-ray security inspection machine to be used in high-temperature environments and / or low-temperature environments. The radiation source includes: a housing assembly, an X-ray tube, a first heat exchanger, a compressor, a second heat exchanger, an expansion valve, and a commutation controller. The housing assembly has a first chamber and a second chamber. The X-ray tube and the first heat exchanger are located in the first chamber. The compressor and the second heat exchanger are located in the second chamber. The first heat exchanger has a first port and a second port. The second heat exchanger has a third port and a fourth port. The fourth port is communicated with the second port through the expansion valve. When the commutation controller is in the first working state, the inlet of the compressor is communicated with the first port, and the outlet of the compressor is communicated with the third port; when the commutation controller is in the second working state, the inlet of the compressor is communicated with the third port, and the outlet of the compressor is communicated with the first port. The radiation source can be used in an X-ray security inspection machine.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic devices, and in particular to a ray source and a security inspection machine. Background Art

[0002] In addition to being used for security inspections in public areas such as airports, high-speed railway stations, and subway stations, security inspection machines are also widely used in scenarios such as express delivery sorting and industrial part inspection. Security inspection machines usually need to work continuously at high power all day long, which puts higher requirements on the continuous detection ability and heat and cold resistance ability of security inspection machines. Summary of the Invention

[0003] In a first aspect, an embodiment of the present invention provides a ray source, including a housing assembly, a ray tube, a first heat exchanger, a compressor, a second heat exchanger, an expansion valve, and a commutation controller. The housing assembly has a first chamber and a second chamber. The wall of the housing assembly corresponding to the first chamber has a ray outlet. The wall of the housing assembly corresponding to the second chamber has a ventilation opening. The ray tube is located in the first chamber. The ray outlet is used for the ray emitted by the ray tube to pass through. The first heat exchanger is located in the first chamber. The first heat exchanger has a first port and a second port. The compressor and the second heat exchanger are both located in the second chamber. The second heat exchanger has a third port and a fourth port. The fourth port is communicated with the second port. The expansion valve is communicated between the fourth port and the second port. The commutation controller has a first working state and a second working state; when the commutation controller is in the first working state, the inlet of the compressor is communicated with the first port, and the outlet of the compressor is communicated with the third port; when the commutation controller is in the second working state, the inlet of the compressor is communicated with the third port, and the outlet of the compressor is communicated with the first port.

[0004] In an embodiment of the present invention, a refrigerant circulation channel can be formed between the compressor, the first heat exchanger, and the second heat exchanger. By changing the working state of the commutation controller, the flow direction of the refrigerant between the first heat exchanger and the second heat exchanger can be changed, thereby changing the refrigeration and heating functions of the first heat exchanger. By switching the refrigeration or heating function of the first heat exchanger, the ambient temperature where the ray tube is located can be adjusted, so that the ambient temperature where the ray tube is located can always be within the working temperature range of the ray tube, improving the stability of the ray tube and extending the service life of the ray tube.

[0005] Optionally, the commutation controller is a fluid commutation valve, and the fluid commutation valve has first to fourth interfaces; the first interface is communicated with the inlet of the compressor; the second interface is communicated with the outlet of the compressor; the third interface is communicated with the first port; the fourth interface is communicated with the third port of the second heat exchanger. Among them, the fluid commutation valve has accurate action, high automation degree, and stable and reliable work.

[0006] Optionally, the commutation controller includes a first control valve, a second control valve, a third control valve, and a fourth control valve; the inlet of the compressor is communicated with the first port through the first control valve, and the outlet of the compressor is communicated with the third port through the second control valve; the inlet of the compressor is communicated with the third port through the third control valve, and the outlet of the compressor is communicated with the first port through the fourth control valve. Among them, in the first working state, the first control valve and the second control valve are opened; in the second working state, the third control valve and the fourth control valve are opened. Among them, by making the commutation controller include a first control valve, a second control valve, a third control valve, and a fourth control valve, the on or off of each pipeline can be controlled separately.

[0007] Optionally, the radiation source further includes insulating oil. The insulating oil is located in the first chamber. Among them, the radiation tube is immersed in the insulating oil. And / or, the first heat exchanger is immersed in the insulating oil. The radiation tube being immersed in the insulating oil can prevent high-voltage breakdown, and can transfer the heat generated when the radiation tube works to the insulating oil, which is beneficial to the heat dissipation of the radiation tube. The first heat exchanger being immersed in the insulating oil enables the first heat exchanger to directly absorb the heat in the insulating oil or directly release heat to the insulating oil, improving the heat exchange efficiency and being beneficial to adjusting the ambient temperature of the radiation tube.

[0008] Optionally, the radiation source further includes an oil pump. The oil pump is located in the first chamber and is used to drive the flow of the insulating oil. With such a setting, by using the oil pump to drive the flow of the insulating oil, the insulating oil near the first heat exchanger can flow towards the radiation tube, and the insulating oil near the radiation tube can flow towards the first heat exchanger. With such a setting, the temperature change of the insulating oil around the radiation tube can be accelerated, and it is beneficial to the heat exchange between the insulating oil and the first heat exchanger.

[0009] Optionally, one of the first heat exchanger and the second heat exchanger is an evaporator, and the other is a condenser. With such a setting, when the first heat exchanger is an evaporator, the second heat exchanger is a condenser, and at this time the function of the first heat exchanger is refrigeration. When the first heat exchanger is a condenser, the second heat exchanger is an evaporator, and at this time the function of the first heat exchanger is heating.

[0010] Optionally, the first heat exchanger includes a first heat exchange tube and a plurality of first fins. The two ends of the first heat exchange tube are respectively a first port and a second port. The plurality of first fins are sleeved on the first heat exchange tube. With such a setting, the plurality of first fins can expand the heat exchange area between the first heat exchanger and the surrounding environment, and improve the heating or refrigeration efficiency of the first heat exchanger.

[0011] Optionally, the first heat exchange tube includes a plurality of first straight tubes arranged side by side, and a first elbow tube connecting adjacent two first straight tubes. With such a setting, the first heat exchange tube is in a reciprocating folded shape, which can extend the flow path of the refrigerant and is beneficial to heat transfer.

[0012] Optionally, the second heat exchanger includes second heat exchange tubes and a plurality of second fins. The two ends of each second heat exchange tube are a third port and a fourth port respectively. The plurality of second fins are sleeved on the second heat exchange tubes. With such an arrangement, the plurality of second fins can increase the heat exchange area between the second heat exchanger and the surrounding heat exchange environment, and improve the heating or cooling efficiency of the second heat exchanger.

[0013] Optionally, the second heat exchange tubes include a plurality of second straight tubes arranged side by side, and second elbows connecting adjacent second straight tubes. With such an arrangement, the second heat exchange tubes are in a reciprocating folded shape, which can extend the flow path of the refrigerant and is beneficial to heat transfer.

[0014] Optionally, the first heat exchanger includes: a first heat exchange tube, with the two ends of the first heat exchange tube being a first port and a second port respectively; the second heat exchanger includes: a second heat exchange tube, with the two ends of the second heat exchange tube being a third port and a fourth port respectively; wherein, the length of the second heat exchange tube is less than that of the first heat exchange tube, which can reduce the volume of the second heat exchange tube, and further reduce the space of the second chamber. When the volume of the internal space of the housing assembly is fixed, by reducing the space of the second chamber, the space of the first chamber can be increased, thereby increasing the amount of insulating oil in the first chamber, and thus improving the heat exchange efficiency between the first heat exchanger and the insulating oil.

[0015] Optionally, the radiation source further includes a fan. The fan is located in the second chamber. The air inlet side or the air outlet side of the fan faces the second heat exchanger. With such an arrangement, the fan can accelerate the air flow around the second heat exchanger, which is beneficial to the heat exchange between the second heat exchanger and the air.

[0016] Optionally, the housing assembly includes a housing main body, a partition plate and a cover body. The housing main body includes a receiving cavity surrounded by a bottom wall and a side wall with an opening at the top and one side. The partition plate is located in the receiving cavity to divide the receiving cavity into a first chamber and a second chamber. The cover body covers the opening at the top of the first chamber to close the first chamber. Among them, the opening at the top and one side of the second chamber is a ventilation opening. With such an arrangement, integrating the radiation tube, the first heat exchanger, the compressor, the second heat exchanger, the expansion valve and the fluid reversing valve into the housing main body and separating them into two chambers by the partition plate can make the structure of the radiation source more compact, facilitating installation and later maintenance. The opening at the top and one side of the second chamber is beneficial to the ventilation and heat exchange of the second heat exchanger.

[0017] Optionally, the radiation source further includes a protective cover. The protective cover covers the top and the opening on one side of the second chamber. The protective cover has at least one ventilation structure, and the ventilation structure includes a plurality of ventilation holes. Among them, the ventilation opening is replaced by the plurality of ventilation holes of the ventilation structure from the top and the opening on one side of the second chamber. With such a setting, the protective cover and the second chamber are of a split structure. The protective cover can not only protect the components in the second chamber, but also be disassembled, facilitating the inspection and maintenance of the components in the second chamber.

[0018] Optionally, the protective cover includes a first plate portion and a second plate portion that are connected to each other. The first plate portion seals the opening at the top of the second chamber. The second plate portion seals the opening on one side of the second chamber. The ventilation structure includes a first ventilation structure and a second ventilation structure. The first ventilation structure is located on the first plate portion. The second ventilation structure is located on the second plate portion. Among them, the orthographic projection of the second heat exchanger on the second plate portion covers at least part of the second ventilation structure. With such a setting, both the top and one side of the second chamber have ventilation structures, which is beneficial to the heat exchange between the second heat exchanger and the air.

[0019] Optionally, the radiation source further includes a circuit board, a controller, and a temperature sensor. The circuit board is electrically connected to the radiation tube. The controller is electrically connected to the compressor, the fluid direction change valve, and the circuit board respectively. The temperature sensor is located in the first chamber and is electrically connected to the controller. The temperature sensor is used to detect the temperature of the insulating oil. With such a setting, the controller can control the circuit board to supply power to the radiation tube, so that the radiation tube emits radiation. The controller can also control the compressor to turn on and off. The controller can also control the fluid direction change valve to change the flow direction of the refrigerant in the first heat exchanger and the second heat exchanger according to the temperature of the insulating oil measured by the temperature sensor, and then switch the heating or cooling function of the first heat exchanger to automatically adjust the temperature of the insulating oil.

[0020] Optionally, the compressor is a piston compressor. And / or, the expansion valve is an electronic expansion valve. And / or, the fluid direction change valve is a four-way change valve. With such a setting, the piston compressor has a wide applicable pressure range, high compression efficiency, and strong adaptability. The electronic expansion valve has a fast adjustment response. The number of interfaces of the four-way change valve can meet the usage requirements.

[0021] In a second aspect, an embodiment of the present invention provides a security inspection machine, including the radiation source described in the first aspect.

[0022] The security inspection machine in the embodiment of the present invention includes the radiation source described in the first aspect, and thus has all the beneficial effects of the first aspect described above, which will not be elaborated here. Description of the Drawings

[0023] To more clearly illustrate the technical solutions in the present invention, the following will briefly introduce the drawings required for use in some embodiments of the present invention. Obviously, the drawings in the following description are only the drawings of some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings. In addition, the drawings in the following description can be regarded as schematic diagrams, and are not limitations on the actual dimensions of the products involved in the embodiments of the present invention, the actual processes of the methods, etc.

[0024] Figure 1 Structural diagram of an X-ray security inspection machine according to some embodiments;

[0025] Figure 2 Structural diagram of an X-ray source according to some embodiments;

[0026] Figure 3 Structural diagram of the internal structure of an X-ray source from a first perspective;

[0027] Figure 4 Structural diagram of the internal structure of an X-ray source from a second perspective;

[0028] Figure 5 Connection relationship diagram of each component in an X-ray source according to some embodiments;

[0029] Figure 6 Structural diagram of a fluid direction control valve according to some embodiments;

[0030] Figure 7 Heat exchange flow chart of an X-ray source according to some embodiments;

[0031] Figure 8 Structural diagram of a first heat exchanger according to some embodiments;

[0032] Figure 9 Structural diagram of a second heat exchanger according to some embodiments;

[0033] Figure 10 Structural diagram of an X-ray source according to some other embodiments. Detailed implementation manners

[0034] The following will describe the embodiments of the present invention in detail with reference to the drawings.

[0035] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0036] The terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0037] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a direct connection, or an indirect connection through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Figure 1 The structural diagram of the security inspection machine in some embodiments of the present invention is shown. As Figure 1 shown, some embodiments of the present invention provide a security inspection machine 300. The security inspection machine 300, also known as the security inspection instrument, is an electronic device that completes the inspection by means of a conveyor belt to send the items to be inspected into the X-ray inspection channel. The security inspection machine 300 is widely used in airports, railway stations, subway stations, bus stations, government office buildings, embassies, conference centers, exhibition centers, hotels, shopping malls, large-scale events, post offices, schools, the logistics industry, industrial inspections, etc.

[0039] It can be understood that the embodiments of the present invention do not further limit the use of the security inspection machine 300. The detection principle of the security inspection machine will be illustrated by way of example below.

[0040] The security inspection machine 300 detects the items to be inspected by means of X-rays. For example, an X-ray source emits X-rays, and a fan-shaped X-ray beam passing through a collimator penetrates the items to be inspected on the conveyor belt. The X-rays are absorbed by the items to be inspected and finally bombard the dual-energy semiconductor detector installed in the channel. The dual-energy semiconductor detector converts the X-rays into signals. These very weak signals are amplified and sent to the signal processing chassis for further processing. X-rays are electromagnetic waves that can penetrate opaque objects such as wood, cardboard, and leather. The security inspection machine 300 can present images of different colors on the screen according to the degree of X-ray absorption by the object. For example, orange represents organic matter, such as food, plastic, etc.; books, ceramics, etc. are displayed in green; metals are displayed in blue. At this time, the security inspector quickly views the image scanned by the X-rays and can judge whether there are prohibited items based on rich experience. With the advancement of smart city and modernization construction, higher requirements are put forward for the item detection ability, heat resistance, and cold resistance working ability of the security inspection machine 300. Such as express sorting, industrial part detection, etc. The security inspection machine needs to work continuously all day long at high power. The ray tube is the core component of the security inspection machine 300 that generates the detection rays. In some examples, to prevent the phenomenon of high-voltage breakdown, the ray tube is often immersed in an oil tank filled with insulating oil. About 99% of the energy generated during its operation will be dissipated into the insulating oil in the form of heat. In a high-temperature environment, if the heat in the insulating oil cannot be dissipated in time, it will directly affect the stability and service life of the ray tube. In a low-temperature environment, the insulating oil will crystallize due to low temperature, resulting in a decrease in insulation strength, and creepage will occur between the high-voltage device and the structural member, affecting the performance and function of the equipment and even causing damage to the equipment components.

[0041] Due to the different temperatures of the insulating oil in the ray source in different use environments, both too high and too low temperatures of the insulating oil will directly affect the working state and service life of the ray tube. In order to enable the ray source to work both in a high-temperature environment and in a low-temperature environment, the existing ray source is improved. Continuing with Figure 1 as an example for illustration. The above-mentioned high-temperature environment is an environment greater than the first temperature threshold, and the mentioned low-temperature environment is an environment less than the second temperature threshold. The first temperature threshold and the second temperature threshold are set according to actual needs. For example, the first temperature threshold can be 45 °C, and the second temperature threshold can be -20 °C.

[0042] In some embodiments, as Figure 1 shown, the security inspection machine 300 includes a security inspection machine main body 200 and a ray source 100. Among them, the ray source 100 is located inside the security inspection machine main body 200. For example, the ray source 100 can be an X-ray source, or a γ-ray source, a β-ray source, an α-ray source, etc. In the following embodiments, the X-ray source is taken as an example for illustration.

[0043] The number of radiation sources 100 can be set to one or more. When the radiation source 100 is set to one, it can be used in connection with a collimator. When the radiation source 100 is set to multiple, they can be set at different positions within the security inspection machine main body 200 to irradiate the item to be tested from multiple angles.

[0044] Figure 2 It is a structural diagram of a radiation source according to some embodiments. Figure 3 It is a structural diagram of the internal structure of a radiation source according to some embodiments from a first perspective. Figure 4 It is a structural diagram of the internal structure of a radiation source according to some embodiments from a second perspective. Figure 5 It is a connection relationship diagram of the components in a radiation source according to some embodiments. The following refers to Figures 2 to 5 to illustrate the structure of the radiation source 100 by way of example.

[0045] In some embodiments, as Figures 2 to 4 shown, the radiation source 100 includes a housing assembly 1, an X-ray tube 2, a first heat exchanger 3, a compressor 4, a second heat exchanger 5, an expansion valve 6, and a commutation controller 7.

[0046] The housing assembly 1 has a first chamber A1 and a second chamber A2. The wall of the housing assembly 1 corresponding to the first chamber A1 has a radiation outlet 131. The wall of the housing assembly 1 corresponding to the second chamber A2 has a ventilation opening. Exemplarily, the radiation outlet 131 can be located at the top of the first chamber A1 or on the side wall of the first chamber A1.

[0047] The X-ray tube 2 is located in the first chamber A1. The radiation outlet 131 is used for the radiation emitted by the X-ray tube 2 to pass through. Exemplarily, the X-ray tube 2 and the radiation outlet 131 can be directly opposite each other or can be offset (in this case, the radiation emitted by the X-ray tube 2 can be adjusted to be directed towards the radiation outlet 131 through a guiding structure), as long as the radiation can be emitted through the radiation outlet 131, and no specific limitation is made here.

[0048] The first heat exchanger 3 is located in the first chamber A1. The compressor 4 and the second heat exchanger 5 are both located in the second chamber A2. Exemplarily, the first heat exchanger 3 is located on the side of the first chamber A1 close to the second chamber A2, and the X-ray tube 2 is located on the side of the first heat exchanger 3 away from the second chamber A2. With such a setting, it is convenient for the arrangement of the connecting pipelines between the first heat exchanger 3, the compressor 4, and the second heat exchanger 5, which is beneficial to saving space.

[0049] As Figure 5 shown, the first heat exchanger 3 has a first port 33 and a second port 34. The second heat exchanger 5 has a third port 53 and a fourth port 54. The fourth port 54 is connected to the second port 34. The expansion valve 6 is connected between the fourth port 54 and the second port 34.

[0050] The commutation controller 7 has a first working state and a second working state. When the commutation controller 7 is in the first working state, the inlet of the compressor 4 is communicated with the first port 33, and the outlet of the compressor 4 is communicated with the third port 53. When the commutation controller 7 is in the second working state, the inlet of the compressor 4 is communicated with the third port 53, and the outlet of the compressor 4 is communicated with the first port 33.

[0051] Wherein, by setting the commutation controller 7, a refrigerant circulation channel can be formed between the compressor 4 and the first heat exchanger 3 and the second heat exchanger 5. Exemplarily, the commutation controller 7 has a first working state and a second working state. When the commutation controller 7 is in the first working state, the flow direction of the refrigerant between the first heat exchanger 3 and the second heat exchanger 5 is the first flow direction. When the commutation controller 7 is in the second working state, the flow direction of the refrigerant between the first heat exchanger 3 and the second heat exchanger 5 is the second flow direction, wherein the first flow direction and the second flow direction are opposite.

[0052] In some of the above embodiments of the present invention, by changing the working state of the commutation controller 7, the flow direction of the refrigerant between the first heat exchanger 3 and the second heat exchanger 5 can be changed, thereby changing the refrigeration and heating functions of the first heat exchanger 3. By switching the refrigeration or heating function of the first heat exchanger 3, the ambient temperature where the ray tube 2 is located can be adjusted, so that the ambient temperature where the ray tube 2 is located can always be within the working temperature range of the ray tube 2, improving the stability of the ray tube 2 and prolonging the service life of the ray tube 2.

[0053] In some examples, the commutation controller 7 can be arranged in the housing assembly 1. Among them, the ray tube 2, the first heat exchanger 3, the compressor 4, the second heat exchanger 5, the expansion valve 6 and the commutation controller 7 are integrated in the housing assembly 1, making the structure of the radiation source 100 more compact and facilitating installation and later maintenance.

[0054] Exemplarily, the compressor 4 is a piston compressor. The piston compressor in this example has the advantages of a wide applicable pressure range, high compression efficiency and strong adaptability. Exemplarily, the expansion valve 6 is an electronic expansion valve. The electronic expansion valve in this example has the advantage of fast adjustment response. It should be noted that in other embodiments, the compressor 4 and the expansion valve 6 can also be of other types as long as they can meet the usage requirements. This embodiment does not limit this.

[0055] Such as Figure 6As shown, in some embodiments, the commutation controller 7 is a fluid commutation valve 7A. The fluid commutation valve 7A has first to fourth interfaces. The first interface 71 is in communication with the inlet of the compressor 4. The second interface 72 is in communication with the outlet of the compressor 4. The third interface 73 is in communication with the first port 33. The fourth interface 74 is in communication with the third port 53. It can be understood that the two openings in communication (such as the aforementioned interfaces, ports, outlets, inlets) can be directly in communication, or they can also be Figures 3 to 6 in communication through the pipeline 400 as shown. The present invention does not limit this.

[0056] Exemplarily, in the first working state, the first interface 71 and the third interface 73 of the fluid commutation valve 7A are in communication. Since the first interface 71 is in communication with the inlet of the compressor 4 and the third interface 73 is in communication with the first port 33, the inlet of the compressor 4 is in communication with the first port 33. At the same time, the second interface 72 and the fourth interface 74 of the fluid commutation valve 7A are in communication. Since the second interface 72 is in communication with the outlet of the compressor 4 and the fourth interface 74 is in communication with the third port 53, the outlet of the compressor 4 is in communication with the third port 53.

[0057] In the second working state, the first interface 71 and the fourth interface 74 of the fluid commutation valve 7A are in communication. Since the first interface 71 is in communication with the inlet of the compressor 4 and the fourth interface 74 is in communication with the third port 53, the inlet of the compressor 4 is in communication with the third port 53. At the same time, the second interface 72 and the third interface 73 of the fluid commutation valve 7A are in communication. Since the second interface 72 is in communication with the outlet of the compressor 4 and the third interface 73 is in communication with the first port 33, the outlet of the compressor 4 is in communication with the first port 33.

[0058] Exemplarily, the fluid commutation valve 7A is a four-way commutation valve. The number of interfaces of the four-way commutation valve in this example can meet the usage requirements.

[0059] It should be noted that in other embodiments, the fluid commutation valve 7A can also be of other types, as long as it can meet the usage requirements. This embodiment does not limit this.

[0060] Among them, the fluid commutation valve 7A has accurate actions, high automation degree, and stable and reliable operation.

[0061] In addition to being able to control the fluid direction-changing valve 7A as described above, in some other embodiments, the direction-changing controller 7 may further include a first control valve, a second control valve, a third control valve, and a fourth control valve. The inlet of the compressor 4 is connected to the first port 33 through the first control valve, and the outlet of the compressor 4 is connected to the third port 53 through the second control valve. The inlet of the compressor 4 is connected to the third port 53 through the third control valve, and the outlet of the compressor 4 is connected to the first port 33 through the fourth control valve. Among them, in the first working state, the first control valve and the second control valve are opened, and the third control valve and the fourth control valve are closed. In the second working state, the third control valve and the fourth control valve are opened, and the first control valve and the second control valve are closed.

[0062] Among them, the inlet of the compressor 4 is connected to the first port 33 through the first control valve. For example, the first control valve includes two interfaces, and the two interfaces are respectively connected to the inlet of the compressor 4 and the first port 33. For example, one of the interfaces is connected to the inlet of the compressor 4 through a pipeline, and the other interface is connected to the first port 33 through a pipeline.

[0063] The outlet of the compressor 4 is connected to the third port 53 through the second control valve. For example, the second control valve includes two interfaces, and the two interfaces are respectively connected to the outlet of the compressor 4 and the third port 53. For example, one of the interfaces is connected to the outlet of the compressor 4 through a pipeline, and the other interface is also connected to the third port 53 through a pipeline.

[0064] The inlet of the compressor 4 is connected to the third port 53 through the third control valve. For example, the third control valve includes two interfaces, and the two interfaces are respectively connected to the inlet of the compressor 4 and the third port 53. For example, one of the interfaces is connected to the inlet of the compressor 4 through a pipeline, and the other interface is also connected to the third port 53 through a pipeline.

[0065] The outlet of the compressor 4 is connected to the first port 33 through the fourth control valve. For example, the fourth control valve includes two interfaces, and the two interfaces are respectively connected to the outlet of the compressor 4 and the first port 33. For example, one of the interfaces is connected to the outlet of the compressor 4 through a pipeline, and the other interface is also connected to the first port 33 through a pipeline.

[0066] Among them, when the direction-changing controller 7 is in the first working state, the first control valve is opened, so that the inlet of the compressor 4 is connected to the first port 33 of the first heat exchanger 3. At the same time, the second control valve is opened, so that the outlet of the compressor 4 is connected to the third port 53 of the second heat exchanger 5.

[0067] When the commutation controller 7 is in the second working state, the third control valve opens, so that the inlet of the compressor 4 is communicated with the third port 53. At the same time, the fourth control valve opens, so that the outlet of the compressor 4 is communicated with the first port 33 of the first heat exchanger 3.

[0068] In some of the above embodiments, by making the commutation controller 7 include a first control valve, a second control valve, a third control valve and a fourth control valve, the on or off of each pipeline can be controlled separately.

[0069] In some embodiments, the radiation source further includes insulating oil. Refer to Figure 3 , the insulating oil is located in the first chamber A1. Wherein, the radiation tube 2 is immersed in the insulating oil. And / or, the first heat exchanger 3 is immersed in the insulating oil.

[0070] Wherein, the radiation tube 2 and the first heat exchanger 3 can be all immersed in the insulating oil. With such a setting, the heat generated when the radiation tube 2 works can be dissipated into the insulating oil. The first heat exchanger 3 is directly immersed in the insulating oil, which is beneficial to the heat exchange between the first heat exchanger 3 and the insulating oil, and improves the regulation efficiency of the temperature of the insulating oil by the first heat exchanger 3.

[0071] In this embodiment, the radiation tube 2 being immersed in the insulating oil can prevent the phenomenon of high-voltage breakdown, and can transfer the heat generated when the radiation tube 2 works to the insulating oil, which is beneficial to the heat dissipation of the radiation tube. The first heat exchanger 3 being immersed in the insulating oil enables the first heat exchanger 3 to directly absorb the heat in the insulating oil or directly release heat to the insulating oil, improves the heat exchange efficiency, and is beneficial to regulating the ambient temperature where the radiation tube 2 is located.

[0072] In some embodiments, as Figure 3 and Figure 4 shown, the radiation source further includes an oil pump 8. The oil pump 8 is located in the first chamber A1 and is used to drive the insulating oil to flow.

[0073] Exemplarily, the oil pump 8 is located on a side wall of the first chamber A1 and is immersed in the insulating oil. Under the drive of the oil pump 8, the flow direction of the insulating oil is: from the first heat exchanger 3 to the radiation tube 2, or from the radiation tube 2 to the first heat exchanger 3.

[0074] It can be understood that the oil pump 8 can be installed at any position in the first chamber A1, as long as it can accelerate the circulation flow of the insulating oil by using the oil pump 8, and the position of the oil pump 8 in the first chamber A1 can be adjusted as needed.

[0075] In this embodiment, an oil pump 8 is used to drive the insulating oil to flow, enabling the insulating oil near the first heat exchanger 3 to flow towards the X-ray tube 2 and the insulating oil near the X-ray tube 2 to flow towards the first heat exchanger 3. With this arrangement, the temperature change of the insulating oil around the X-ray tube 2 can be accelerated, and heat exchange between the insulating oil and the first heat exchanger 3 is facilitated.

[0076] Figure 7 It is a heat exchange flow chart of an X-ray source according to some embodiments. In some embodiments, referring to Figure 7 , one of the first heat exchanger and the second heat exchanger is an evaporator, and the other is a condenser.

[0077] For example, the first heat exchanger 3 is an evaporator, and the second heat exchanger 5 is a condenser. At this time, the first heat exchanger 3 is in a refrigeration mode.

[0078] Referring to Figure 7 , when the first heat exchanger 3 is in a refrigeration mode, referring to the dashed arrow in Figure 7 , the refrigerant in the form of a low-pressure liquid absorbs heat and evaporates into a low-pressure steam in the first heat exchanger 3. The absorption of heat by the refrigerant evaporation reduces the ambient temperature where the X-ray tube 2 is located. Then, the low-pressure steam enters the compressor 4 through the fluid direction-changing valve 7A. Under the action of the compressor 4, it is compressed into a high-pressure steam. The high-pressure steam flows from the outlet of the compressor 4 into the second heat exchanger 5 through the fluid direction-changing valve 7A; the high-pressure steam condenses into a high-pressure liquid due to heat release in the second heat exchanger 5; the high-pressure liquid is transformed into a low-pressure liquid under the throttling action of the expansion valve 6; the low-pressure liquid returns to the first heat exchanger 3 to complete the refrigeration cycle.

[0079] For example, the first heat exchanger is a condenser, and the second heat exchanger is an evaporator. At this time, the first heat exchanger 3 is in a heating mode.

[0080] Referring to Figure 7 , under the action of the fluid direction-changing valve 7A, the refrigerant flows in the reverse direction, realizing the functional interchange between the first heat exchanger 3 and the second heat exchanger 5, making the first heat exchanger 3 in a heating mode. Referring to the solid arrow in Figure 7 , at this time, the high-pressure steam sent from the compressor 4 enters the first heat exchanger 3. The high-pressure steam releases heat and condenses into a high-pressure liquid in the first heat exchanger 3. The refrigerant releases heat and liquefies, increasing the ambient temperature where the X-ray tube 2 is located. Then, the high-pressure liquid is transformed into a low-pressure liquid under the throttling action of the expansion valve 6. The low-pressure liquid flows into the second heat exchanger 5 and absorbs heat and evaporates into a low-pressure steam in the second heat exchanger 5. The low-pressure steam enters the inlet of the compressor 4 through the fluid direction-changing valve 7A. Under the action of the compressor 4, it is compressed into a high-pressure steam; the high-pressure steam returns from the outlet of the compressor 4 to the first heat exchanger 3 through the fluid direction-changing valve 7A again to complete the heating cycle.

[0081] Figure 8Structural diagram of a first heat exchanger according to some embodiments. In some embodiments, as Figure 8 shown, the first heat exchanger 3 includes a first heat exchange tube 31 and a plurality of first fins 32. The two ends of the first heat exchange tube 31 are respectively a first port 33 and a second port 34. The plurality of first fins 32 are sleeved on the first heat exchange tube 31.

[0082] Exemplarily, the plurality of first fins 32 are parallel to each other. With such an arrangement, a uniform gap can be formed between two adjacent first fins 32, which is beneficial to the heat exchange between the first fins 32 and the environment.

[0083] Exemplarily, the first heat exchange tube 31 and the first fins 32 are connected by expansion joint, so that the first heat exchange tube 31 and the first fins 32 are in close contact with each other, which is beneficial to the transfer of heat.

[0084] In this embodiment, sleeving a plurality of first fins 32 on the first heat exchange tube 31 can expand the heat exchange area between the first heat exchanger 3 and the surrounding heat exchange environment, and improve the heating or cooling efficiency of the first heat exchanger 3.

[0085] In some embodiments, as Figure 8 shown, the first heat exchange tube 31 includes a plurality of first straight tubes 311 arranged side by side, and a first elbow tube 312 connected between two adjacent first straight tubes 311.

[0086] Exemplarily, the first elbow tube 312 is a U-shaped tube. Connecting two adjacent first straight tubes 311 through a U-shaped tube makes the structure of the first heat exchange tube 31 more compact while meeting the length requirement.

[0087] Exemplarily, the plurality of first straight tubes 311 are parallel to each other, and the plurality of first fins 32 are sleeved on the plurality of first straight tubes 311.

[0088] In this embodiment, the first heat exchange tube 31 is in a reciprocating folded shape, which can extend the flow path of the refrigerant, is beneficial to heat transfer, and has a more compact structure, which is beneficial to saving space in the first chamber A1.

[0089] Figure 9 Structural diagram of a second heat exchanger according to some embodiments. In some embodiments, as Figure 9 shown, the second heat exchanger 5 includes a second heat exchange tube 51 and a plurality of second fins 52. The two ends of the second heat exchange tube 51 are respectively a third port 53 and a fourth port 54. The plurality of second fins 52 are sleeved on the second heat exchange tube 51.

[0090] Exemplarily, the plurality of second fins 52 are parallel to each other. With such an arrangement, a uniform gap can be formed between two adjacent second fins 52, which is beneficial to the heat exchange between the second fins 52 and the environment.

[0091] Exemplarily, the second heat exchange tube 51 and the second fin 52 are connected by expansion joint, so that the second heat exchange tube 51 and the second fin 52 are in close contact, which is beneficial to heat transfer.

[0092] In this embodiment, a plurality of second fins 52 are sleeved on the second heat exchange tube 51, which can expand the heat exchange area between the second heat exchanger 5 and the surrounding heat exchange environment, and improve the heating or cooling efficiency of the second heat exchanger 5.

[0093] In some embodiments, as Figure 9 shown, the second heat exchange tube 51 includes a plurality of second straight tubes 511 arranged side by side, and a second elbow 512 connecting adjacent two second straight tubes 511.

[0094] Exemplarily, the second elbow 512 is a U-shaped tube. The adjacent two second straight tubes 511 are connected by a U-shaped tube, so that the second heat exchange tube 51 is more compact in structure on the premise of meeting the length requirement.

[0095] Exemplarily, a plurality of second straight tubes 511 are parallel to each other, and a plurality of second fins 52 are sleeved on the plurality of second straight tubes 511.

[0096] In this embodiment, the second heat exchange tube 51 is in a reciprocating folded shape, which can extend the flow path of the refrigerant, is beneficial to heat transfer, and is more compact in structure, which is beneficial to saving space in the second chamber A2.

[0097] In some embodiments, the length of the second heat exchange tube 51 is less than the length of the first heat exchange tube 31. With such a setting, on the premise of ensuring the switching of the refrigeration and heating functions of the first heat exchange tube 31, the volume of the second heat exchange tube 51 can be reduced, and then the space of the second chamber A2 can be reduced. And when the volume of the internal space of the housing assembly 1 is certain, by reducing the space of the second chamber A2, the space of the first chamber A1 can be increased, so that the amount of insulating oil in the first chamber A1 can be increased, thereby improving the heat exchange efficiency between the first heat exchanger 3 and the insulating oil.

[0098] In some other embodiments, the setting of the expansion valve can make the length of the first heat exchange tube 31 less than the length of the second heat exchange tube 51, so that the volume of the first heat exchange tube 31 can be reduced, and then the space of the first chamber A1 can be reduced.

[0099] In some embodiments, referring to Figures 3 to 5 , the ray source further includes a fan 9. The fan 9 is located in the second chamber A2. The air inlet side or the air outlet side of the fan 9 faces the second heat exchanger 5.

[0100] Exemplarily, the blower 9 is disposed on one side surface of the second heat exchanger 5. Such an arrangement can improve the heat dissipation efficiency of the second heat exchanger 5. It should be noted that the blower 9 can be disposed at any position in the second chamber A2, as long as it can accelerate the air circulation speed around the second heat exchanger 5, and is not limited to Figure 4 the position shown in

[0101] In this embodiment, the blower 9 is used to accelerate the air flow in the second chamber A2, which is beneficial to the heat exchange between the second heat exchanger 5 and the air.

[0102] In some embodiments, such as Figure 2 and Figure 3 shown, the housing assembly 1 includes a housing main body 11, a partition plate 12 and a cover body 13. The housing main body 11 includes a receiving cavity surrounded by a bottom wall 111 and a side wall 112 with an opening at the top and one side. The partition plate 12 is located in the receiving cavity to divide the receiving cavity into a first chamber A1 and a second chamber A2. The cover body 13 covers the opening at the top of the first chamber A1 to close the first chamber A1. Among them, as Figure 3 shown, the openings at the top and one side of the second chamber A2 are ventilation openings.

[0103] Exemplarily, as Figure 2 shown, the ray outlet 131 is located on the cover body 13 and includes a window 1311 and a transparent cover plate 1312 that closes the window 1311.

[0104] Exemplarily, as Figure 2 shown, the cover body 13 also includes a pair of handles 132, and the pair of handles 132 are respectively located on opposite sides of the ray outlet 131. Such an arrangement facilitates the installation and disassembly of the cover body 13 and also facilitates the movement of the radiation source 100.

[0105] Exemplarily, the shape of the receiving cavity can be cylindrical, or square or other polygons. This embodiment does not limit this.

[0106] Exemplarily, the housing assembly can be made of a metal material, such as stainless steel. It can also be made of a non-metal material, such as plastic.

[0107] In this embodiment, the ray tube 2, the first heat exchanger 3, the compressor 4, the second heat exchanger 5, the expansion valve 6 and the fluid commutation valve 7A are integrated in the housing main body 11 and separated into two chambers by the partition plate 12, which can make the structure of the radiation source 100 more compact, facilitating installation and later maintenance. The openings at the top and one side of the second chamber A2 are beneficial to the ventilation and heat exchange of the second heat exchanger 5.

[0108] In some embodiments, such as Figure 2As shown, the radiation source further includes a protective cover 14. The protective cover 14 covers the top and the opening on one side of the second chamber A2. The protective cover 14 has at least one ventilation structure 143.

[0109] Exemplarily, the protective cover 14 can be fixed to the second chamber A2 by screws or by snap fasteners. This embodiment does not limit this, as long as the fixation of the protective cover 14 can be achieved.

[0110] In this embodiment, the protective cover 14 and the second chamber A2 are of a split structure and can be disassembled, which is convenient for the maintenance and repair of the components in the second chamber A2.

[0111] In some embodiments, as Figure 2 shown, the protective cover 14 includes a first plate portion 141 and a second plate portion 142 that are connected to each other. The first plate portion 141 covers the opening at the top of the second chamber A2. The second plate portion 142 covers the opening on one side of the second chamber A2. The ventilation structure 143 includes a first ventilation structure 1411 and a second ventilation structure 1421. The first ventilation structure 1411 is located on the first plate portion 141. The second ventilation structure 1421 is located on the second plate portion 142. Among them, the orthographic projection of the second heat exchanger 5 on the second plate portion 142 covers at least part of the second ventilation structure 1421.

[0112] Exemplarily, the first ventilation structure 1411 includes a plurality of ventilation holes. The shape of the ventilation holes can be a slotted hole, an oval hole, a round hole, a square hole, and other polygonal holes or special-shaped holes. This embodiment does not limit this.

[0113] Exemplarily, the plurality of ventilation holes of the first ventilation structure 1411 are arranged in an array and are evenly distributed between the opposite sides of the first plate portion 141. Such a setting is beneficial to the air circulation in the second chamber A2. It can be understood that the plurality of ventilation holes of the first ventilation structure 1411 can be regularly arranged, such as in an array, or irregularly arranged. This embodiment does not limit this.

[0114] Exemplarily, the second ventilation structure 1421 can be composed of a plurality of ventilation holes or can adopt a dust-proof net. The orthographic projection of the second heat exchanger 5 on the second plate portion 142 covers at least part of the second ventilation structure 1421. The air outlet side of the fan 9 faces the second heat exchanger 5, and the air outlet direction faces the second ventilation structure 1421. With such a setting, the air around the second heat exchanger 5 can be quickly discharged from the second chamber A2 through the second ventilation structure 1421.

[0115] In this embodiment, both the top and one side of the second chamber A2 have the ventilation structure 143, which is beneficial to the heat exchange between the second heat exchanger 5 and the air.

[0116] Figure 10Structural diagram of a radiation source according to some embodiments. In some embodiments, as Figure 10 shown, it further includes a circuit board 101, a controller 102, and a temperature sensor 103. The circuit board 101 is electrically connected to the radiation tube 2. The controller 102 is electrically connected to the compressor 4, the fluid direction control valve 7A, and the circuit board 101 respectively. The temperature sensor 103 is located in the first chamber A1 and is electrically connected to the controller 102. The temperature sensor 103 is used to detect the temperature of the insulating oil.

[0117] Exemplarily, the number of the temperature sensors 103 is one, and the position of the temperature sensor 103 in the first chamber A1 is close to the radiation tube 2 to detect the temperature of the insulating oil around the radiation tube 2. In other examples, the number of the temperature sensors 103 is two or more, and they are evenly distributed in the first chamber A1 to be able to detect the temperatures of the insulating oil at different positions in the first chamber A1.

[0118] The controller 102 of this embodiment can control the fluid direction control valve 7A to change the flow direction of the refrigerant in the first heat exchanger 3 and the second heat exchanger 5 according to the temperature of the first chamber A1 measured by the temperature sensor 103, and further switch the heating or cooling function of the first heat exchanger 3 to achieve automatic regulation of the temperature of the insulating oil. The controller 102 can also control the radiation tube 2 to emit radiation through the circuit board 101. Exemplarily, the circuit board 101 is a high-voltage circuit board, and the high-voltage circuit board is electrically connected to the radiation tube 2 for the purpose of being able to emit high-voltage radiation. Exemplarily, the high-voltage radiation is radiation above KHZ (kilohertz).

[0119] It should be noted that the controller 102 can also be electrically connected to the oil pump 8 to control the start / stop, frequency, or rotation speed, etc. of the oil pump 8. The controller 102 can also be electrically connected to the expansion valve 6 to control the throttling degree of the expansion valve 6, and further control the pressure of the refrigerant passing through the expansion valve 6.

[0120] In the description of this specification, specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0121] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claimed rights.

Claims

1. A radiation source, characterized in that, Comprising: A housing assembly having a first chamber and a second chamber; a radiation outlet is provided on the wall of the housing assembly corresponding to the first chamber; a ventilation opening is provided on the wall of the housing assembly corresponding to the second chamber; A radiation tube located in the first chamber; the radiation outlet is for the radiation emitted by the radiation tube to pass through; A first heat exchanger located in the first chamber; the first heat exchanger has a first port and a second port; A compressor and a second heat exchanger, both located in the second chamber; the second heat exchanger has a third port and a fourth port; the fourth port is communicated with the second port; An expansion valve communicated between the fourth port and the second port; and, A commutation controller having a first working state and a second working state; when the commutation controller is in the first working state, the inlet of the compressor is communicated with the first port, and the outlet of the compressor is communicated with the third port; when the commutation controller is in the second working state, the inlet of the compressor is communicated with the third port, and the outlet of the compressor is communicated with the first port.

2. The radiation source according to claim 1, wherein The commutation controller is a fluid commutation valve having first to fourth interfaces; the first interface is communicated with the inlet of the compressor; the second interface is communicated with the outlet of the compressor; the third interface is communicated with the first port; the fourth interface is communicated with the third port of the second heat exchanger.

3. The radiation source according to claim 1, wherein The commutation controller includes a first control valve, a second control valve, a third control valve, and a fourth control valve; the inlet of the compressor is communicated with the first port through the first control valve, and the outlet of the compressor is communicated with the third port through the second control valve; the inlet of the compressor is communicated with the third port through the third control valve, and the outlet of the compressor is communicated with the first port through the fourth control valve; Wherein, in the first working state, the first control valve and the second control valve are opened; in the second working state, the third control valve and the fourth control valve are opened.

4. The radiation source according to claim 2, characterized in that, Further comprising: Insulating oil located in the first chamber; Wherein, the radiation tube is immersed in the insulating oil; And / or, the first heat exchanger is immersed in the insulating oil.

5. The radiation source according to claim 4, characterized in that, Further comprising: An oil pump located in the first chamber; The oil pump is used to drive the insulating oil to flow.

6. The radiation source according to claim 1, wherein One of the first heat exchanger and the second heat exchanger is an evaporator, and the other is a condenser.

7. The radiation source according to claim 1, wherein The first heat exchanger includes: A first heat exchange tube, with the two ends of the first heat exchange tube being the first port and the second port respectively; A plurality of first fins sleeved on the first heat exchange tube.

8. The radiation source according to claim 7, characterized in that, The first heat exchange tube includes: A plurality of first straight tubes arranged side by side; and, A first elbow tube connecting adjacent two of the first straight tubes.

9. The radiation source according to claim 1, characterized in that, The second heat exchanger includes: A second heat exchange tube, with the two ends of the second heat exchange tube being the third port and the fourth port respectively; A plurality of second fins are sleeved on the second heat exchange tube.

10. The radiation source according to claim 9, characterized in that, The second heat exchange tube includes: A plurality of second straight tubes arranged side by side; and, Second elbows that communicate between two adjacent second straight tubes.

11. The ray source according to claim 1, wherein The first heat exchanger includes: a first heat exchange tube, with the two ends of the first heat exchange tube being the first port and the second port respectively; The second heat exchanger includes: a second heat exchange tube, with the two ends of the second heat exchange tube being the third port and the fourth port respectively; Wherein, the length of the second heat exchange tube is less than the length of the first heat exchange tube.

12. The radiation source according to any one of claims 1 to 11, characterized in that, It further includes: A blower, located in the second chamber; the air inlet side or the air outlet side of the blower faces the second heat exchanger.

13. The radiation source according to any one of claims 1 to 11, characterized in that, The housing assembly includes: A housing main body, including a receiving cavity enclosed by a bottom wall and a side wall with an opening at the top and one side; A partition plate, located in the receiving cavity to divide the receiving cavity into the first chamber and the second chamber; A cover body, which covers the opening at the top of the first chamber to close the first chamber; Wherein, the opening at the top and one side of the second chamber is the ventilation opening.

14. The radiation source according to claim 13, characterized in that, It further includes: A protective cover, which covers the opening at the top and one side of the second chamber; The protective cover has at least one ventilation structure, and the ventilation structure includes a plurality of ventilation holes; Wherein, the ventilation opening is replaced by the plurality of ventilation holes of the ventilation structure from the opening at the top and one side of the second chamber.

15. The ray source according to claim 14, wherein The protective cover includes a first plate portion and a second plate portion connected to each other; the first plate portion covers the opening at the top of the second chamber; the second plate portion covers the opening at one side of the second chamber; The ventilation structure includes: A first ventilation structure, located on the first plate portion; A second ventilation structure, located on the second plate portion, wherein the orthographic projection of the second heat exchanger on the second plate portion covers at least part of the second ventilation structure.

16. The radiation source according to claim 4, wherein It further includes: A circuit board, which is electrically connected to the ray tube; A controller, electrically connected to the compressor, the fluid reversing valve and the circuit board respectively; and, A temperature sensor, located in the first chamber and electrically connected to the controller; the temperature sensor is used to detect the temperature of the insulating oil.

17. The ray source according to any one of claims 2 to 11, wherein The compressor is a piston compressor; and / or, The expansion valve is an electronic expansion valve; and / or, The fluid reversing valve is a four-way reversing valve.

18. An X-ray security inspection machine, characterized in that, It includes: The ray source according to any one of claims 1 to 17.

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