CN117939863B

CN117939863B - Low-noise temperature control device and method for medical imaging equipment and medical imaging equipment

Info

Publication number: CN117939863B
Application number: CN202410329891.9A
Authority: CN
Inventors: 侯建昆; 所福亮; 张宁
Original assignee: Sinovision Technology Beijing Co ltd
Current assignee: Sinovision Technology Beijing Co ltd
Priority date: 2024-03-22
Filing date: 2024-03-22
Publication date: 2024-06-21
Anticipated expiration: 2044-03-22
Also published as: CN117939863A

Abstract

The application provides a low-noise temperature control device and method for medical imaging equipment and the medical imaging equipment. The low noise temperature control device includes: an interface plate dividing a space of the equipment rack into a front cavity and a rear cavity, having a plurality of openings; a rotor plate covering the interface plate, and provided with a ventilation opening at a position corresponding to the electronic component of the rotor assembly; an inner housing assembly disposed in the front cavity, defining a regular annular rotation space with the rotor support; an air supply fan arranged at the bottom of the front cavity and an air exhaust fan arranged at the top of the rear cavity, wherein the air supply fan supplies air towards the annular rotating space; a heat radiation fan for making air flow toward the electronic component; the air supply direction is at least partially tangential to the rotation direction of the rotor assembly, the air flow is entrained by the rotor assembly to rotate, is sucked to the electronic component by the cooling fan, flows from the front cavity into the rear cavity through the ventilation opening and the interface plate opening, and is discharged by the exhaust fan. The low-noise temperature control device dynamically controls noise and has good heat dissipation effect.

Description

Low-noise temperature control device and method for medical imaging equipment and medical imaging equipment

Technical Field

The application relates to the field of medical equipment, in particular to a temperature control and noise reduction technology of medical imaging equipment.

Background

Medical imaging devices, such as CT (Computed Tomography) devices, have been widely used in modern medicine for screening and diagnosis of disease. The conventional CT apparatus is composed of a gantry (accommodating therein a rotatable X-ray source and X-ray detector), a human subject support (including a horizontally movable bed board for supporting a human subject), an operation console (providing a user operation interface, receiving and storing scan data, reconstructing and displaying CT tomographic images), and some auxiliary systems. In the scanning process, the scanning frame rotates at a fixed position, the detecting person horizontally lies on the patient support, and the bed board of the detecting person support supports the detecting person to horizontally move.

The gantry of a CT apparatus generally comprises a stator assembly and a rotor assembly, wherein the rotor assembly mounts a plurality of electronic components including a bulb for generating X-rays, a bulb heat sink, a high voltage generator for supplying the bulb, and a detector for receiving the X-rays. These components will generate a lot of heat during operation, which if not dissipated in time will affect the performance of the electronic components, seriously affecting the imaging quality and even causing a shutdown. In the process of gradually improving the performance of the CT apparatus, electronic components in the CT apparatus, which need to dissipate heat, are also gradually increased, so that heat dissipation power consumption will be larger and larger. The heat dissipation effect inside the CT device directly affects the imaging quality of the CT device. At present, the whole machine of the CT equipment mostly adopts a simple and reliable air cooling mode to dissipate heat, and most of selected fans are axial flow fans which are arranged above heating components on the front side of the equipment, so that the heat dissipation function of the whole machine of the CT equipment is realized. To improve the heat dissipation effect, a method of increasing the rotation speed of the fans or increasing the number of fans is generally adopted, which increases the noise of the device.

Accordingly, it is desirable to provide a heat sink for a CT apparatus that has low noise and better heat dissipation.

Disclosure of Invention

The application aims to provide a low-noise temperature control scheme for medical imaging equipment, which provides a good heat dissipation effect and can dynamically control noise in the equipment, so that the overall performance of the equipment is improved, and the experience of users and detected people is improved.

In order to achieve the above object, a first aspect of the present application provides a low noise temperature control device for a medical imaging apparatus, comprising: an interface board vertically arranged in the equipment rack of the medical imaging equipment to divide a space defined by the equipment rack into a front cavity and a rear cavity, the interface board being provided with a plurality of openings covering the whole area thereof; a rotor plate covering the interface plate around a rotor bracket of a rotor assembly for carrying medical imaging equipment in the front cavity, and providing a ventilation opening at a position corresponding to an electronic component of the rotor assembly; an inner housing assembly disposed in the front cavity around the rotor support in front of the rotor plate, defining a regular annular rotation space with the rotor support; the air supply fan and the air exhaust fan are arranged at the bottom of the front cavity and supply air towards the annular rotating space, and the air exhaust fan is arranged at the top of the rear cavity; a heat radiation fan arranged in the vicinity of the electronic component to cause an air flow toward the electronic component; the air supply direction of the air supply fan is at least partially tangential to the rotating direction of the rotor assembly, the fed air flow is carried by the rotor assembly to rotate and is sucked to the electronic component through the cooling fan, flows through the electronic component, flows into the rear cavity from the front cavity through the ventilation opening on the rotor plate and the opening on the interface plate, and is discharged through the exhaust fan by the optional exhaust component communicated with the exhaust fan.

Optionally, the low-noise temperature control device further comprises a measurement and control device, the measurement and control device comprises a front cavity temperature sensor, a rear cavity temperature sensor, a frequency converter and a controller which are in communication connection with each other, wherein the front cavity temperature sensor and the rear cavity temperature sensor respectively sense the front cavity temperature P1 and the rear cavity temperature P2, and the controller changes the working frequencies of the air supply fan and the air exhaust fan through the frequency converter according to the front cavity temperature and the rear cavity temperature to control fan noise, wherein the front cavity temperature sensor senses the temperature of the air inlet position of the heat radiation unit of the detector of the medical imaging device and takes the temperature of the air inlet of the heat radiation unit as the front cavity temperature P1.

Optionally, the controller stores a preset low temperature threshold t1, high temperature threshold t2, and temperature difference threshold t0, and sets a first boundary condition δ++t0 and t1+.p1+.t2, where δ=p2-P1, and in case the first boundary condition is met, the controller sets the operating frequency to the nominal frequency f.

Optionally, the controller further sets a second boundary condition δ < t 0:

Third boundary condition ，

Fourth boundary conditionA kind of electronic device

Fifth boundary condition；

In response to the second boundary condition being met,

If the third boundary condition is met, the controller sets the operating frequency to，

If the fourth boundary condition is met, the controller sets the operating frequency to，

If the fifth boundary condition is met, the controller sets the operating frequency to。

Optionally, the inner shell assembly is formed from a plurality of arcuate plates, a plurality of straight plates, or a combination thereof, to form a substantially circular axisymmetric or centrosymmetric structure.

Optionally, the inner shell assembly comprises: the top arc plate, the upper arc plate, the lower arc plate, the side straight plate and the optional bottom arc plate or straight plate are used for limiting an annular rotation space which is axisymmetric relative to the vertical direction, wherein a grid or mesh plate type air supply opening is formed on the lower arc plate on the right side.

Optionally, the interface plate is configured in a grid pattern comprising a base plate fixed to the equipment rack 20 and a plurality of circumferential ribs and a plurality of radial ribs on the base plate, the circumferential ribs and the radial ribs defining a plurality of regions in the base plate for forming the openings; and the rotor plate is formed by a plurality of sub-rotor plates, at least one part of the sub-rotor plates are provided with ventilation openings, and the configuration of the outer side edge of the rotor plate is matched with the configuration of the inner side surface of the inner shell assembly.

Optionally, the air supply fan is arranged at the periphery of the inner shell assembly and is positioned in an independent cavity at the bottom of the inner shell assembly, and the independent cavity is closed relative to the inner space of the inner shell assembly and is provided with a side air inlet.

According to a second aspect of the present application, there is provided a low noise temperature control method using the low noise temperature control device according to the first aspect of the present application.

According to a third aspect of the present application, there is provided a medical imaging apparatus comprising the low noise temperature control device according to the first aspect of the present application, the medical imaging apparatus being configured as a CT apparatus, a PET apparatus or an MRI apparatus, wherein the rotor assembly is configured to have an outer boundary conforming to an annular rotation space defined by the inner housing assembly.

The technical scheme provided by the embodiment of the application can comprise the following beneficial effects: the rotational space defined by the inner housing assembly defines a regular airflow movement space and flow path, reducing turbulence of irregular flow and reducing cutting of the airflow by the rotor assembly, thus reducing noise; the interface board divides the equipment rack into a front cavity (high temperature area) and a rear cavity (low temperature area), so that cold air flow enters the rear cavity after the front cavity and the electronic components are comprehensively heat exchanged, and the cold energy of the cold air flow can be completely utilized; the interface plate, rotor plate, inner housing assembly, blower and exhaust fan design and arrangement provide a directional stable airflow path from the bottom of the front cavity into the rear cavity in the longitudinal direction through the radiator fan after rotating in the circumferential direction in the annular rotating space of the inner housing assembly, and being exhausted through the top exhaust fan; the air flow of the front cavity is concentrated at the position of the electronic component and is discharged into the rear cavity after heat exchange is completed around the rotor component, and all the cold air flow flows into the rear cavity through the electronic component, so that the optimal heat dissipation effect can be provided; the direction of the air flow fed into the front cavity is tangential to the direction of rotation of the rotor assembly belt, which reduces the cutting of the air flow by the rotor assembly and, therefore, reduces noise.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application, are incorporated in and constitute a part of this specification. The drawings and their description are illustrative of the application and are not to be construed as unduly limiting the application. In the drawings:

fig. 1 is a schematic view showing an internal structure of a medical imaging apparatus equipped with a low-noise temperature control device according to an embodiment of the present invention;

FIG. 2 is an internal block diagram of a medical imaging device with a top mount removed according to an embodiment of the present invention;

FIG. 3 is a schematic view showing an internal structure of a retainer frame of a medical imaging apparatus with a rotor assembly removed according to an embodiment of the present invention;

FIG. 4 is a partial schematic view of a rotor assembly of a medical imaging device according to an embodiment of the present invention;

fig. 5 is a schematic view showing the construction of a low noise temperature control device according to an embodiment of the present invention;

FIG. 6 is a schematic structural view of an inner housing assembly of a low noise temperature control device according to an embodiment of the present invention;

FIG. 7 is a schematic view of an inner housing assembly disposed about a rotor support according to an embodiment of the present invention;

FIG. 8 is a schematic view of an inner housing assembly and interface plate mounted to an equipment rack according to an embodiment of the present invention;

FIG. 9 is a schematic view of an inner shell assembly inboard mounting rotor plate according to an embodiment of the present invention;

FIG. 10 is a schematic view of the mounting of a bracket component for a rotor assembly inside an inner housing assembly according to an embodiment of the present invention;

FIG. 11 is a schematic diagram showing the constitution of a measurement and control device of a low noise temperature control device according to an embodiment of the present invention;

FIG. 12 is a flow chart of a low noise temperature control method according to an embodiment of the present invention;

FIG. 13 is a graph of fan frequency versus noise for a medical imaging device according to an embodiment of the present invention;

FIG. 14 is a schematic view of a structure in an anterior chamber of a medical imaging device according to an embodiment of the present invention;

FIG. 15 is a schematic structural view of a rotor assembly of a medical imaging device according to an embodiment of the present invention;

FIG. 16 is a schematic view of a structure in a rear cavity of a medical imaging device according to an embodiment of the present invention; and

Fig. 17 is a schematic view of an air supply fan of the low noise temperature control device according to the embodiment of the present invention.

Detailed Description

In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the application herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are only used to better describe the present application and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations.

Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present application will be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, the terms "mounted," "configured," "provided," "connected," "coupled," and "sleeved" are to be construed broadly. For example, "connected" may be in a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

Specific embodiments according to the present invention will be described below with reference to the accompanying drawings.

The invention aims to provide a low-noise and controllable-noise ventilation and heat dissipation device for medical imaging equipment, which is used for realizing a heat dissipation scheme with good heat dissipation efficiency, low noise and controllable noise in real time by improving the internal structure and spatial arrangement of the medical imaging equipment, configuring the directional airflow routes of the subareas and dynamically changing the working frequency (the rotating speed of a fan) according to the heat dissipation condition.

Referring first to fig. 1, there is shown an internal structure of a medical imaging apparatus equipped with a low noise temperature control device according to an embodiment of the present invention, including a low noise temperature control device 10, an apparatus frame 20, and a rotor assembly 30. A low noise temperature control device 10 (hereinafter simply referred to as "temperature control device 10") and a rotor assembly 30 are mounted to the equipment rack 20, the rotor assembly 30 being located in a front side portion of the equipment rack 20. The equipment rack 20 is generally square in configuration, the temperature control device 10 and the rotor assembly 30 may be centered or offset with respect to the equipment rack 20, the constituent components of the temperature control device 10 being fixedly mounted, the rotor assembly 30 being rotatably mounted.

Fig. 2 and 3 show internal structural views of the medical imaging apparatus at different stages of installation. In the block diagram of fig. 2, a top mount 20F for securing the equipment rack 20 to the equipment housing (not shown) is removed and a bulb 35 mounted on top of the rotor assembly 30 is shown. In the structure of fig. 3, a retainer 34 for fixing the rotor holder 31 to the equipment rack 20 is removed, which is installed outside a positioning frame 33 fixedly connected to the rotor holder 31. The assembled rotor assembly 30 is shown in fig. 2 and 3, and fig. 4 shows a partial detail view of the rotor assembly 30, wherein the illustrated electronics 36 and bulb 35 of fig. 2 and 3 are heat generating components of the medical imaging device. Other constituent parts of the medical imaging apparatus will be described later.

Fig. 5 shows a schematic configuration of the temperature control apparatus 10, including: an air supply fan 11A and an air exhaust fan 11B for supplying a flowing air stream, an inner case assembly 13 for defining an air stream movement space, an interface plate 17 for dividing different temperature regions, and a rotor plate 18 for defining a position where the air stream flows to the interface plate 17. The heat dissipation fans 12A, 12B, 12C, 12D and the heat sink for dissipating heat from the rotor assembly 30 are shown in fig. 3.

The interface plate 17 is vertically disposed within the equipment rack 20 to divide the equipment rack 20 into a front chamber 21 and a rear chamber 22, and a side of the equipment rack 20 in which the rotor assembly 30 (rotating body) is mounted is a front side in which the front chamber 21 is located. The inner housing assembly 13, the rotor plate 18 and the rotor assembly 30 are arranged in the front cavity 21. The front chamber 21 is a high temperature region and the rear chamber 22 provides an exhaust space, which is a low temperature region, due to the heat generated from the rotor assembly 30. In order to provide a flow path for the hot air from the front chamber 21 to the rear chamber 22, the interface plate 17 has a plurality of openings 17E, 17F (see fig. 8). In operation of the apparatus, the rotor assembly 30 rotates and thus changes in real time relative to the position of the interface plate 17, with a plurality of openings 17E and 17F covering the entire area of the interface plate 17, in order for the air flow from the rotor assembly 30 to flow rapidly through the interface plate 17 into the rear chamber 22 at each real time position.

A rotor plate (spacer plate) 18 is overlaid on the interface plate 17 within the front cavity 21, mounted around the rotor bracket 31 between the rotor bracket 31 and the inner housing assembly 13, constituting a backing plate for mounting components of the rotor assembly 30. The rotor plate 18 is designed such that air of the front cavity 21 flows from front to back only at the position of the electronic component 36, preventing heat generated by the electronic component 36 from flowing back to the front cavity 21. The rotor plate 18 is provided with ventilation openings 18A, 18B, 18C, 18D (see fig. 9) selectively at positions corresponding to the electronic components 36, and the heat radiation fans 12A, 12B, 12C, 12D guide and converge the hot air at positions of the electronic components 36 where it flows into the rear chamber 22 via the ventilation openings 18A to 18D and the openings 17E, 17F on the interface plate 17.

The air supply fan 11A and the air exhaust fan 11B are disposed at the bottom of the front chamber 21 and the top of the rear chamber 22, respectively, to provide air flow paths as indicated by arrows Aw1, aw2, aw31, aw32, and Aw33, and Aw4 in fig. 5. Arrow Aw1 indicates the direction of air supply into the front chamber 21 through the air inlet 25, aw2 indicates the direction of rotation of the rotor assembly 30 and the direction in which the air follows the rotation of the rotor assembly 30, aw31, aw32, aw33 indicates the direction of air flow from the front chamber 21 to the rear chamber 22, and Aw4 indicates the direction of air exhaust through the exhaust member 27 at the top of the rear chamber 22. During the flow, the air flows through the electronic component 36 in accordance with the rotational direction Aw1 of the rotor assembly 30 to provide cooling.

The cooling fans 12A, 12B, 12C, 12D are disposed adjacent to the electronic component 36, such as immediately behind or in front of, to focus the airflow toward the electronic component 36 to remove heat and define a stable directional airflow path for airflow in the inner housing assembly 13 to flow into the rear cavity via the ventilation openings 18A-18D. A direct current fan may be selected as the cooling fan 12A-12D. An additional heat sink may be disposed adjacent to the electronic component 36 to dissipate heat from the electronic component 36 by thermal conduction. Referring to fig. 4, a wind-guiding member 19, such as a wind-guiding hood, is arranged behind the radiator fan 12B, which wind-guiding member 19 serves to guide the air flow from the radiator fan 12B to the ventilation openings 18B in the rotor plate 18, ensuring that substantially all the air flow in the inner housing assembly 13 flows into the rear chamber via the ventilation openings 18A-18D.

The inner housing assembly 13 is arranged centrally around the rotor support 31 in the front cavity 21, together with the rotor support 31 defining a regular annular rotation space 13I for the rotor assembly 30, which is concentric with the rotor support 31 to make the combined structure of the inner housing assembly 10 and the rotor assembly 30 more regular. The inner housing assembly 13 encloses the rotor assembly 30 on the one hand and rotates the rotor assembly 30 in a regular space on the other hand, thereby reducing wind noise generated by turbulence and air cutting by the rotor assembly 30 at high rotational speeds. As shown by arrow Aw1 in fig. 5, the rotation path of the rotor assembly 30 is circular, and wind noise is generated by continuously cutting air when the rotor assembly 30 rotates due to the different and irregular structures of the various components on the rotor assembly 30. Wind noise becomes a significant cause of overall noise when the rotational speed of the rotor assembly 30 exceeds 200 rpm. The primary function of the inner housing assembly 13 is to reduce wind noise generated by the rotor assembly 30 at high speeds above 200rpm, and by defining a regular annular duct within the front cavity 21 of the equipment rack 20, the direction of air flow within the front cavity 21 is stabilized and follows the direction of rotation Aw2, thereby reducing turbulence and cutting of air by the rotor assembly 30. The regular annular rotation space may be circular or polygonal, generally of central or axial symmetry, to provide a regular interior space.

According to the present application, the direction Aw31 of the air flow provided by the blower fan 11A is at least partially tangential to the rotation direction Aw2 of the rotor assembly 30, so as to further reduce the cutting of the air by the rotor assembly 30. During cooling and temperature control, the air supply fan 11A supplies the lower temperature air in the scanning chamber toward the rotor assembly 30 into the front chamber 21, the air is entrained by the rotor assembly 30 in the annular rotation space 13I to flow in the circumferential direction, mix and flow through the electronic component 36, the cooling fans 12A, 12B, 12C and 12D on the electronic component 36 flow the lower temperature air of the front chamber 21 toward the radiator near the cooling fans 12A to 12D, and the heat exchanged air flows into the rear chamber 22 in the longitudinal direction through the ventilation openings 18A to 18D on the rotor plate 18 at the position of the electronic component 36 and the openings 17E, 17F on the interface plate 17, and finally is discharged through the exhaust member 27 on the top of the rear chamber 22 via the exhaust fan 11B.

The above-described low noise temperature control device 10 according to the present invention provides the following advantageous technical effects: by the arrangement of the inner housing assembly 13, the rotor plate 18, and the blower fan 11A and the air outlet fan 11B, and the cooling fans 12A to 12D, the airflow direction in the cavity of the equipment rack 20 is kept stable and controllable, so that the heat exchange route of the airflow coincides with the rotation direction Aw2 and the linear velocity direction of the rotor assembly 30, and with the position of the electronic component 36, that is: the air supply fan 11A sends air flow from the bottom of the front cavity 21 along the rotation direction of the rotor assembly 30, the air flow flows along the periphery of the rotor assembly 30 along the linear speed direction of the rotor assembly 30 inside the inner shell assembly 13 and is mixed in the annular rotation space, the air flow is converged at the position of the electronic component 36 by the cooling fans 12A-12D and flows to the rear cavity 22, and is discharged from the top of the equipment rack 20 by the exhaust fan 11B, so that effective heat dissipation is realized; the inner shell component 13 provides a regular rotation space surrounding the rotor component 30, defines a regular flow line for air flow, reduces turbulence generated by air flow mixing, and can effectively reduce air flow noise inside the equipment at high rotation speed of the rotor component 30; the location of the cooling fans 12A-12D and the ventilation openings 18A-18D allows the air flow to be entirely focused at the location of the electronic component 36 toward the rear cavity 22 without wasting cold, resulting in better heat dissipation efficiency.

Other aspects and advantages according to the application will be described with continued reference to the accompanying drawings.

The inner shell assembly 13 according to the present application may be made of 6 or 8 sheet metal or plastic plate members, which may be arcuate plates, straight plates or a combination thereof, to form a regular axisymmetric or centrosymmetric substantially circular inner side. Arcuate plates are more advantageous than straight plates in reducing the stagnation and concentration of air flow at the connection locations. It will be appreciated that various combinations of arcuate and straight plates may achieve the technical effect of reducing wind noise, provided that the inner shell assembly 13 is constructed with a regular geometry.

Fig. 6 and 7 show a schematic view of the structure and arrangement of the inner housing assembly 13 according to one embodiment. The inner housing assembly 13 includes: top arcuate plate 13A, upper two arcuate plates 13B and 13C, side straight plates 13D and 13E, lower arcuate plates 13F and 13G. The structure may also be configured with an optional bottom arcuate plate or straight plate 13J, and the bottom arcuate plate or straight plate 13J may not be used in the case where the lower arcuate plates 13F and 13G are closer to the bottom plate 20A of the equipment rack 20. The inner housing assembly 13 defines a rotation space axisymmetric with respect to the vertical direction (vertical direction of the equipment rack 20), and the defined rotation space is also maintained substantially circular since the straight plates 13D and 13E are symmetrically arranged only on the left and right sides. An air supply port 28 is formed in the lower arcuate plate 13G on the right side at a position corresponding to the position of the air supply fan 11A, and the air supply port 28 is configured in a grid or mesh pattern to assist in controlling the direction of the air supply, providing an air flow at least partially tangential to the direction of rotation Aw 2. The overall configuration of the air supply opening 28 conforms to the arcuate inner wall of the arcuate plate 13G to assist the airflow in following the direction of rotation of the rotor assembly 30 with less cutting, resulting in tangential airflow. The plurality of plate members 13A-13G are connected to one another by a joint edge 13H, which in the example of FIG. 6 is configured as a hem to facilitate the installation of additional fasteners, such as fasteners 13K for securing the inner housing assembly 13 to the equipment rack 20 and/or interface plate 17. It should be understood that the engagement edge 13H is not limited to the pattern shown in the figures, and that other suitable patterns of structures may be used depending on design requirements.

Fig. 7 shows that the inner housing assembly 13 is arranged concentrically with respect to the rotor support 31. The inner housing assembly 13 is connected to the fixed structure in the equipment rack 20 through a plurality of fixing frames 13K (refer to fig. 1 and 8), and the inner housing assembly 13 is assembled to form a circular ring concentric with the rotor support 31 and the rotor assembly 30, so as to surround the rotor assembly 30. When the device works, the rotor assembly 30 arranged at the periphery of the rotor bracket 31 and the slip ring 37 rotates in the annular rotating space 13I to drive air to rotate together, the inner shell assembly 13 limits air flow in the annular rotating space 13I, the air flow only flows in the annular rotating space 13I along the inner wall of the inner shell assembly 13, a great deal of turbulence caused by the air flow flowing in an irregular open space is prevented, and turbulence noise and noise caused by cutting of the turbulence are reduced.

Fig. 8 shows a schematic view of the mounting of the inner housing assembly 13 and the interface plate 17 to the equipment rack 20, and fig. 9 and 10 show a schematic view of the mounting of the rotor plate 18 and the rotor bracket 31, the positioning frame 33 for the rotor assembly 30 and the retention frame 34 on the basis of the structure of fig. 8.

As shown in fig. 8, the interface plate 17 is fixed by the equipment rack 20, and the outer geometry of the interface plate 17 conforms to the main fixing member 20D in the equipment rack 20. The interface plate 17 is configured in a grid pattern, which includes: a base plate 17A fixed to the main fixing member 20D, first and second circumferential ribs 17B and 17C formed on the base plate 17A, and a plurality of radial ribs (webs) 17D. The base plate 17A provides an outer geometry conforming to the primary securing member 20D, and the geometry of the first circumferential rib 17B conforms to and advantageously conforms to the inner shape of the inner housing assembly 13 to cause airflow in a circumferential direction within the rotational space 13I inside the inner housing assembly 17. The circumferential ribs 17B, 17C and the radial rib 17D define regions on the base plate 17A for forming the plurality of openings 17E and 17F. The formation of a plurality of openings by the above-described structure is distributed in concentric circumferential annular regions, allowing the air flow to pass freely over the interface plate 17.

The particular manner in which the inner housing assembly 13 is mounted to the equipment rack 20 by the mount 13K is also shown in fig. 8. The inner housing assembly 13 is fixed to the main fixing member 20D of the equipment rack 20 at the top by the fixing frame 13K, is fixed to the fixing member 20C at the side by the fixing frame 13K, and is also fixedly connected with other components (not shown) by means of the connecting edge 13H. The securing member 20C includes a post 20C1, a diagonal beam 20C2 and a cross beam 20C3 that form a stable bracket and may add additional securing or connecting structures depending on the installation requirements.

As shown in the front view of fig. 9 and the perspective view of fig. 10, the rotor plate 18 includes a plurality of sub-rotor plates that meet each other, and the sub-rotor plates may be configured as panels, with their respective outer edges collectively constituting the outer edges of the rotor plate 18 that conform to the inner geometry of the first circumferential rib 17B of the interface plate 17. A plurality of sub-rotor plates are overlaid on the interface plate 17, and a complete rotor plate 18 is constructed for mounting the individual constituent components of the rotor assembly 30. The ventilation openings 18A, 18B, 18C, and 18D described above are formed in at least a portion of the sub-rotor plates of the rotor plate 18, depending on the arrangement of the electronic components 36 of the rotor assembly 30. As shown in the example of fig. 4, the ventilation opening 18B corresponds to the position of the cooling fan 12B, and an additional air guide member 19 is provided between the ventilation opening 18B and the ventilation fan 12B to guide the air flow of the cooling fan 12B to the ventilation opening 18B. The vent openings 18A, 18C, and 18D are arranged in a similar manner to vent opening 18B. The underside of the rotor plate 18 is also provided with arcuate vent openings 18E for venting and heat dissipation from the detector (not shown).

With continued reference to fig. 5, the low noise temperature control device 10 according to the present application includes a device for real-time temperature measurement and noise reduction, hereinafter referred to as a "measurement and control device". The measurement and control device comprises a front cavity temperature sensor 15A, a rear cavity temperature sensor 15B, a frequency converter 16 and a controller 14, which are in communication connection with each other. Based on the structure and arrangement, the measuring and controlling device realizes real-time monitoring and control of noise and temperature. The front chamber temperature sensor 15A and the rear chamber temperature sensor 15B are disposed in the front chamber 21 and the rear chamber 22 of the apparatus frame 20, respectively, for sensing the temperature P1 of a heat radiating unit (e.g., an air inlet position of the heat radiating unit) of the detector and the operating environment temperature P2 of the medical imaging apparatus, and hereinafter the temperatures P1 and P2 are referred to as a front chamber temperature and a rear chamber temperature. The temperature sensors 15A and 15B are, for example, thermal resistance temperature sensors. The controller 14 and the frequency converter 16 are disposed at suitable locations within the equipment rack 20, as will be described in greater detail below. The frequency converter 16 is used for changing the operating frequency of the air supply fan 11A and the air exhaust fan 11B, thereby changing the fan rotation speed, and the controller 14 changes the fan rotation speeds of the air supply fan 11A and the air exhaust fan 11B through the frequency converter 16 according to the front cavity temperature P1 and the rear cavity temperature P2 to control noise generated when the fans are operated. Fan noise is positively correlated with fan speed, and therefore, fan noise can be reduced by reducing fan speed.

Fig. 11 shows a schematic diagram of the configuration of the measurement and control device according to one embodiment. The controller 14 may be configured as a single-chip microcomputer including an FPGA, an ARM, and a digital-to-analog converter 14A in communication with each other. The front cavity temperature sensor 15A and the rear cavity temperature sensor 15B send the front cavity temperature P1 and the rear cavity temperature P2 to the digital-to-analog converter 14A to be converted into temperature data, and data interaction is performed between the digital-to-analog converter 14A and the FPGA and the ARM to determine how to change the working frequencies of the air supply fan 11A and the air exhaust fan 11B, and corresponding instructions are sent to the frequency converter 16 to change the working frequencies and the fan rotation speeds.

Based on the measurement and control device provided by the application, a corresponding low-noise temperature control method is provided. Fig. 12 shows a flowchart of the low noise temperature control method according to the present application.

First, a preset first temperature threshold t1, second temperature threshold t2, and third temperature threshold t0 are stored in the controller 14. t0 is a threshold value of the temperature difference δ of the front cavity temperature P1 and the rear cavity temperature P2, δ=p1-P2, for example set to 15 ℃; t1 is the lower limit (low temperature threshold) of the rear cavity temperature P2 (the working environment temperature of the medical imaging equipment), the working environment temperature of the equipment is usually required to be 20-26 ℃, and t1 can be set to be 20 ℃; t2 is the upper limit (high temperature threshold) of the front cavity temperature P1 (the temperature of the air inlet of the heat dissipating unit of the detector), above which the heat dissipating unit of the detector will not work properly (although other electronic components 36 may still work), and insufficient heat dissipating capability will make the temperature of the detector not within a reasonable range, t2 may be set to 30 ℃.

The controller 14 also stores a plurality of boundary conditions for determining the operating frequency, including:

First boundary conditions: delta is more than or equal to t0, t1 is more than or equal to p1 is more than or equal to t2,

Second boundary condition: delta is less than t0, and the number of the components is less than t0,

Third boundary condition:，

fourth boundary condition: A kind of electronic device

Fifth boundary condition:。

the controller 14 controls the operating frequencies of the blower fan 11A and the exhaust fan 11B according to the above-described boundary conditions, in a specific manner described with reference to fig. 12.

When the first boundary condition is met, the normal heating of each component of the image equipment is indicated, the heat dissipation of the equipment is good, and the heat generated by the heating component can be effectively led out of the equipment rack 20. In this case, the controller 14 sets the operating frequencies of the blower fan 11A and the exhaust fan 11B to the nominal frequency f.

And when the second boundary condition is met, the heat dissipation capacity of the image equipment is larger than the heat generation capacity of the heat generation component in the equipment. In this case, the controller 14 performs frequency conversion control of the blower fan 11A and the exhaust fan 11B to reduce fan noise. Specifically:

When the third boundary condition is met, the controller 14 sets the operating frequencies of the fans 11A and 11B to be ；

When the fourth boundary condition is met, the controller 14 sets the operating frequencies of the fans 11A and 11B to；

If the fifth boundary condition is met and no error is reported in the other large components of the imaging device, the controller 14 sets the operating frequency of the fans 11A and 11B to be less or not operatedThe blower fan 11A and the exhaust fan 11B operate at low rotational speeds, and fan noise is significantly reduced.

The boundary conditions described above and shown in fig. 12 are only examples, and the boundary conditions and the corresponding operating frequencies may be appropriately modified according to design requirements. For example, in the case of meeting the second boundary condition, the blower fan 11A and the exhaust fan 11B may be set at the nominal frequency f andThe boundary conditions between the operations are finer to control the noise at high speeds more finely. Or the respective boundary conditions may be set for the operating frequencies of the air supply fan 11A and the air exhaust fan 11B to independently control the rotational speeds of the air supply fan 11A and the air exhaust fan 11B, which adapts to the influence of different internal structures of the front chamber 21 and the rear chamber 22 on the air flow rate, and allows more arrangement of the number and positions of the fans.

Fig. 13 is a graph showing the effect of temperature control and noise reduction using the measurement and control device of the present application. As shown in fig. 13, in the case of reducing the operating frequencies of the blower fan 11A and the exhaust fan 11B, the fan noise is not higher than 50dBA, and this level of noise is pleasant for both the worker and the inspector. At the same timeWhen the working frequency f works, the noise is about 35dBA, and about 1/2 of the noise when the nominal frequency f works, so that the noise is obviously reduced, and the power consumption of the equipment is reduced.

The above process is a dynamic, real-time control process: when the working intensity of the image equipment is high and the heating value is large, the temperature difference delta between the front cavity temperature P1 and the rear cavity temperature P2 is increased, so that the working frequencies of the air supply fan 11A and the air exhaust fan 11B can be increased, the fan rotating speed is increased, and the fan noise is correspondingly increased; when the working strength of the equipment is reduced and the heating value is reduced, the difference delta between the front cavity temperature P1 and the rear cavity temperature P2 is reduced, so that the working frequencies of the air supply fan 11A and the air exhaust fan 11B can be reduced, the fan rotating speed is reduced, and the fan noise is correspondingly reduced. Therefore, the whole control process is to ensure that the temperature in the cavity of the image equipment meets the working requirement of the detector, ensure the good heat dissipation capacity of the system based on the temperature, and dynamically reduce the noise of the fan based on the temperature.

In addition, if P1 > t2, it indicates that the equipment is operating abnormally, such as heat accumulation caused by abnormality of the air supply fan 11A and the air outlet fan 11B and the system air conditioner; if P1< t1, it indicates that the system air conditioner of the device is abnormal, so that the ambient temperature is lower than the operating temperature of the device. In the above situation, the system main control device reports errors to prompt the staff to overhaul the equipment.

The present application also provides a medical imaging apparatus equipped with the low-noise temperature control device 10 described above, with continued reference to fig. 1 to 3, and with reference to fig. 14 to 17, the constitution of the medical imaging apparatus of the present application will be described.

As described above, the low noise temperature control device 10 is installed in the front cavity 21 of the equipment rack 20, and the rotor assembly 30 is installed inside the inner housing assembly 13 through the rotor bracket 31 and the rotor plate 18. The various components of the rotor assembly 30 are arranged between the rotor plate 18 and the positioning frame 33, the whole being rotatable around the rotor-to-rotor 31. As shown in fig. 14 and 15, the various components of the rotor assembly 30 are arranged on the rotor plate 18 in a regular annular layout that matches the geometry of the annular rotational space 13I inside the inner housing assembly 13, which further reduces turbulence and air cutting caused by irregular geometry during rotation of the rotor assembly 30. Fig. 14 shows that the positioning frame 33 of the rotor assembly 30 is entirely of a ring-shaped structure divided into three parts having substantially the same circumferential length by the top opening 33A and the lower left and right branch portions 33B, and the arrangement of the rotor assembly 30 based on the structure has a better degree of balance.

Fig. 9, 10 and 14 show the mounting manner and configuration of the rotor holder 31. The retainer 34 fixedly connected with the rotor bracket 31 through the connection rod 34A fixedly connects the rotor bracket 31 to the side fixing plate 20B and the main fixing member 20D of the equipment rack 20, whereby the rotor bracket 31 carries the rotor assembly 30 and allows the rotor assembly 30 to rotate therearound. The rear and front portions of the rotor bracket 31 are provided with a plurality of connection bars 31A and connection bars 31D corresponding in position as partition frames of the respective constituent members of the rotor assembly 13, and the partition frames divided into areas are provided with mounting frames 31B, 31C, and 31E for mounting the constituent members of the rotor assembly 30.

Fig. 16 shows the structure in the rear cavity 22 of the equipment rack 20, showing the manner in which the slip ring retainer 32 is mounted. The slip ring holder 32 defines a rotation track for the slip ring 35 together with the rotor bracket 31 and holds the slip ring 35 in the rotation track. An arc-shaped fixing piece 17F1 is provided on the interface plate 17 in the circumferential direction, and the slip ring retainer 32 is connected to the arc-shaped fixing piece 17F1 through the connection pieces 17F2 and 17F3, thereby being fixed to the interface plate 17. Fig. 16 further shows the external geometry of the interface plate 17 conforming to the polygonal body structure of the equipment rack 20, which allows the interface plate 17 to nest in the polygonal body structure, and the equipment rack 20 bottom is provided with a fixing plate 20F for fixedly connecting the rear side of the interface plate 17 with the equipment rack 20.

Fig. 14 and 16 show the arrangement of the blower fan 11A and the exhaust fan 11B. The blower fan 11A is installed in a separate chamber 21A on the right side of the bottom of the front chamber 21, and the chamber 21A is closed with respect to the inner space defined by the inner housing assembly 13 and the rear chamber 22 by a plate member 13G on the right lower side of the inner housing assembly 13. That is, the air flow does not circulate between the chamber 21A and the space inside the inner housing assembly 13 and the rear cavity 22. As shown in fig. 6 and 7, the right cover plate 21C of the chamber 21A is provided with an air inlet 25, the rear side of which is closed by the rear cover plate 21D, and the air supply opening 28 of the upper plate member 13G is used only for supplying air to the inside of the inner case assembly 13 by the air supply fan 11A. Although the chamber 21A is closed with respect to the inner space of the inner housing assembly 13, the chamber 21A is open to other areas of the imaging device, as shown in fig. 16.

The exhaust fan 11B is mounted on the left and right sides of the top of the rear chamber 22 through a fixing lever 20E and a mounting plate 20F at the top of the equipment rack 20, as shown in fig. 16. The securing lever 20E and the mounting plate 20F are additionally arranged on the polygonal main body structure of the equipment rack 20, substantially at the rear side of the interface plate 17 or flush therewith. The exhaust member 27 is fitted around the exhaust port of the exhaust fan 11B, the exhaust member 27 is opened upward, and the side air guide walls 27A and 27B are configured to guide the air flow to a predetermined area. As shown in fig. 16, the air guiding wall 27A of the air exhausting member 27 on the right side of the top of the equipment rack 20 has an arc structure for guiding the air flow toward the upper left side of the equipment, the air guiding wall 27B of the air exhausting member 27 on the left side of the top has a flat structure for guiding the air flow toward the upper left side, and the air flow exhausted from the air exhausting fan 11B is converged in the upper left area of the equipment and then exhausted from the medical imaging equipment.

Fig. 17 shows an example of the blower fan 11A, in which an eddy centrifugal fan is used as the blower fan 11A, and air is sucked into the blower fan 11A from the intake port 11A1, and is discharged from the exhaust port 11A2 after being boosted in rotation. The exhaust fans 11B may have the same configuration. The advantage of the vortex centrifugal fan is that the direction of the air supply can be controlled by the orientation of the fan, of course, by designing the appropriate exhaust member 27, the axial fan is equally applicable to the present application.

The controller 14 of the measurement and control device may be installed in an area between the side plate 20B and the inner housing assembly 13 at the upper left of the equipment rack 20, and a mounting bracket for mounting the controller 1 may be provided in the area, as shown in fig. 1. The frequency converter 16 is installed in a separate chamber 21B on the left side of the bottom of the front chamber 21, and the chamber 21B is closed with respect to the inner space defined by the inner housing assembly 13 by a plate member 13F on the left lower side of the inner housing assembly 13, so that the air flow does not circulate between the chamber 21B and the space inside the inner housing assembly 13. Similar to chamber 21A, chamber 21B is open to other areas of the imaging device, as shown in fig. 16. Also, as shown in fig. 1 and 14, a vent 24 and a fan 26 are provided on the front panel of the chamber 21B to promote air flow.

In general, the inner housing assembly 13 defines a regular annular rotational space 13I, the rotor assembly 30 (rotational part) of the medical imaging device is arranged inside the rotational space 13I, and the rotor assembly 30 has a substantially regular annular layout to accommodate the configuration of the rotational space 13I. The measurement and control means (fixed part) of the low noise temperature control device is arranged at the periphery of the inner housing assembly 13, wherein the positions of the controller 14 and the frequency converter 16 are as described above, the front cavity temperature sensor 15A is arranged in front of the area defined by the inner housing assembly 13, which may be located near the heat radiation unit air inlet of the detector, the rear cavity temperature sensor 15B is arranged behind the interface plate 17, and example positions of the front cavity temperature sensor 15A and the rear cavity temperature sensor 15B are as shown in fig. 5.

The parts of the medical imaging device related to the low-noise temperature control device according to the application are described above, and the arrangement of other components is not described in detail herein.

In summary, in the present application, a stable directional airflow path is defined by the air supply fan 11A, the air exhaust fan 11B, the inner housing assembly 13, the rotor plate 18, and the interface plate 17, so as to achieve a good heat dissipation effect; the regular rotational space 13I defined by the inner housing assembly 13 and the regular annular layout of the rotor assembly 30 significantly reduces noise generated when the rotor assembly 30 rotates, particularly at high speeds; the noise of the air supply fan 11A and the air exhaust fan 11B can be controlled in real time by dynamically changing the operating frequencies of the air supply fan 11A and the air exhaust fan 11B by the measurement and control device. The present application provides a heat dissipation path adapted to the movement path of the rotating part and thus reduces the air flow noise by changing the internal structural layout of the medical imaging apparatus, while controlling the fan noise in real time while maintaining the temperature range required by the electronic part 36 by dynamically changing the fan rotation speed according to the operation condition using the frequency conversion device.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A low noise temperature control device (10) for medical imaging equipment, comprising:

an interface panel (17) arranged vertically within an equipment rack (20) of the medical imaging equipment to divide a space defined by the equipment rack into a front cavity (21) and a rear cavity (22), the interface panel having a plurality of openings (17E, 17F) thereon covering an entire area thereof;

a rotor plate (18) on which a rotor holder (31) surrounding a rotor assembly (30) for carrying the medical imaging device is overlaid within the front cavity, and ventilation openings (18A, 18B, 18C, 18D) are provided at positions corresponding to electronic components (36) of the rotor assembly;

An inner housing assembly (13) arranged in the front cavity around the rotor support in front of the rotor plate, defining together with the rotor support a regular annular rotation space (13I);

an air supply fan (11A) disposed at the bottom of the front chamber and supplying air toward the annular rotation space, and an air exhaust fan (11B) disposed at the top of the rear chamber;

a heat radiation fan (12A-12D) arranged in the vicinity of the electronic component to cause an air flow toward the electronic component;

Wherein the direction of the air supply fan is at least partially tangential to the direction of rotation (Aw 2) of the rotor assembly, the incoming air flow is entrained in rotation by the rotor assembly and sucked to the electronic component by the heat dissipation fan, flows through the electronic component and then flows from the front cavity into the rear cavity through the ventilation opening in the rotor plate and the opening in the interface plate, and is exhausted by the exhaust fan via an optional exhaust member (27) in communication with the exhaust fan;

The measurement and control device comprises a front cavity temperature sensor (15A), a rear cavity temperature sensor (15B), a frequency converter (16) and a controller (14) which are in communication connection with each other, wherein the front cavity temperature sensor and the rear cavity temperature sensor respectively sense a front cavity temperature P1 and a rear cavity temperature P2, and the controller changes the working frequencies of the air supply fan and the air exhaust fan through the frequency converter according to the front cavity temperature and the rear cavity temperature so as to control fan noise.

2. The low noise temperature control device according to claim 1, wherein the front cavity temperature sensor senses a temperature of an air inlet position of a heat radiating unit of a detector of the medical imaging apparatus and takes the temperature of the air inlet of the heat radiating unit as the front cavity temperature P1.

3. The low noise temperature control device according to claim 2, wherein the controller stores a preset low temperature threshold t1, high temperature threshold t2, and temperature difference threshold t0, and sets first boundary conditions δ++t0 and t1+.p1+.t2, wherein δ=p2-P1, in the case where the first boundary conditions are met, the controller sets the operating frequency to a nominal frequency f.

4. A low noise temperature control device according to claim 3, wherein the controller further sets a second boundary condition δ < t0 and:

Third boundary condition: ，

fourth boundary condition: A kind of electronic device

Fifth boundary condition:；

In response to the second boundary condition being met,

The controller sets the operating frequency to be，

The controller sets the operating frequency to be。

5. The low noise temperature control device of any of claims 1-4, wherein the inner housing assembly is comprised of a plurality of arcuate plates, a plurality of straight plates, or a combination thereof to form a substantially circular axisymmetric or centrosymmetric structure.

6. The low noise temperature control device of claim 5, wherein the inner housing assembly comprises: a top arcuate plate (13A), an upper arcuate plate (13B, 13C), a lower arcuate plate (13F, 13G), a side straight plate (13D, 13E) and optionally a bottom arcuate plate or straight plate (13J) to define the annular rotation space axisymmetric with respect to the vertical direction, wherein a grid or mesh plate type air supply opening (28) is formed on the lower arcuate plate (13G) on the right side.

7. The low-noise temperature-control device according to any one of claims 1 to 4, wherein,

The interface plate is configured in a grid pattern comprising a base plate (17A) fixed to the equipment rack (20) and a plurality of circumferential ribs (17B, 17C) and a plurality of radial ribs (17D) on the base plate, the circumferential ribs and the radial ribs defining a plurality of regions in the base plate for forming the openings; and

The rotor plate is formed of a plurality of sub-rotor plates, at least a portion of the sub-rotor plates having the ventilation openings therein, the configuration of the outer side edges of the rotor plates conforming to the configuration of the inner side of the inner housing assembly.

8. The low noise temperature control device according to any of claims 1 to 4, characterized in that the air supply fan is arranged at the periphery of the inner shell assembly in a separate chamber (21A) at the bottom of the inner shell assembly, which is closed with respect to the inner space of the inner shell assembly and has a side air intake (25).

9. A low noise temperature control method using the low noise temperature control device according to any one of claims 1 to 8, comprising the steps of:

Storing a preset low temperature threshold t1, a preset high temperature threshold t2 and a preset temperature difference threshold t0 and a plurality of boundary conditions for determining the working frequencies of the air supply fan and the air exhaust fan in the controller, wherein the boundary conditions comprise:

First boundary conditions: delta is more than or equal to t0 and t1 is more than or equal to P1 is more than or equal to t2, wherein delta=P2-P1,

Third boundary condition:，

fourth boundary condition: A kind of electronic device

Fifth boundary condition:；

The front cavity sensor and the rear cavity temperature sensor transmit the sensed front cavity temperature P1 and the sensed rear cavity temperature P2, respectively, to the controller;

The controller controls the working frequencies of the air supply fan and the air exhaust fan through the frequency converter according to the front cavity temperature P1, the rear cavity temperature P2 and the boundary conditions, wherein:

when the first boundary condition is met, the controller sets the working frequency to be a nominal frequency f;

The controller changes the operating frequency when the second boundary condition is met, wherein:

The controller sets the operating frequency to be ；

The controller sets the operating frequency to be；

The controller sets the operating frequency to be。

10. A medical imaging device comprising the low noise temperature control device of any one of claims 1 to 8, configured as a CT device, a PET device, or an MRI device, wherein the rotor assembly is configured to have an outer boundary conforming to the annular rotational space defined by the inner housing assembly.