CN113438862B - Heat dissipation device of CT detector assembly and design method thereof - Google Patents
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Abstract
The invention belongs to the technical field of CT, and particularly relates to a heat dissipation device of a CT detector assembly and a design method thereof. The CT detector is internally provided with a plurality of detector modules and is characterized by also comprising an air feeder, a plenum box and air supply manifolds, wherein the number of the air supply manifolds is the same as that of the detector modules; the air supply outlet of the air feeder is opposite to the static pressure box; the air inlet of the air supply manifold is communicated with the static pressure box; the air inlets of the air supply manifolds are opposite to the detector module; the air supply manifolds correspond to the detector modules one to one. The invention is suitable for detectors with various specifications, and has the characteristics of ensuring the constant temperature of each module and being beneficial to reducing the noise of the detectors during operation.
Description
Technical Field
The invention belongs to the technical field of CT, and particularly relates to a heat dissipation device of a CT detector assembly and a design method thereof.
Background
The detector is a core component in the CT system, and the stability of the output signal of the CT detector has a very large relationship with the temperature, and in the system using the CT detector, the temperature of the detector must be stabilized by adjusting the heating or cooling. The CT detector needs to maintain a constant temperature during operation, but the power consumption of an image processing chip is large, each module needs the image processing chip, and the number of the modules is large.
At present, a common heat dissipation method in the market is to arrange a plurality of heat dissipation fans above the detector, however, the above method has the following problems:
1. gaps are inevitably formed between the fans, and poor heat dissipation can exist in the middle modules;
2. the plurality of cooling fans have high running noise and high power, the generated air flows are mutually influenced, and the actual cooling efficiency is low;
3. the filter screen area of a plurality of fans is big, and it is inconvenient to remove dust.
Therefore, it is necessary to design a heat dissipation device for a CT detector, which can ensure the temperature of each module to be constant, is suitable for detectors of various specifications, and is also beneficial to reducing the noise generated during the operation of the detector.
For example, chinese utility model patent with application number CN201820434043.4 a CT detector heat abstractor, including detector assembly roof and the fan apron of being connected with the detector assembly roof, be equipped with a plurality of fans on the fan apron, the roof mouth has been seted up on the detector assembly roof, be equipped with the wind channel between detector assembly roof and the fan apron, the roof mouth is connected to the one end in wind channel, and the air outlet of fan is connected to the other end. Although the air duct is arranged on the fan cover plate, air passing through the ventilation opening can be completely gathered at the air inlet of the top plate, the air passing through the dustproof device is greatly utilized, the air duct is designed, and the utilization efficiency of the air blown by the cooling fan is improved, so that the detector is efficiently cooled, the heat dissipation is stable, and the heat dissipation efficiency is remarkable; therefore, the air cooling efficiency is improved, but the defects of poor heat dissipation of the middle module, low actual heat dissipation efficiency and inconvenient dust removal are caused because the heat dissipation mode adopts the mode of arranging the plurality of fans on the fan cover plate.
Disclosure of Invention
The invention provides a CT detector assembly heat dissipation device which can ensure the constant temperature of each module, is suitable for detectors with various specifications and is beneficial to reducing the noise of the detectors during operation and a design method thereof, aiming at overcoming the problems that the heat dissipation of an intermediate module is poor, the actual heat dissipation efficiency is low and the dust removal is inconvenient in the existing heat dissipation mode that a plurality of heat dissipation fans are arranged above the detectors in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the CT detector assembly heat dissipation device comprises a CT detector, wherein a plurality of detector modules are arranged in the CT detector, and the CT detector further comprises an air feeder, a static pressure box and air feeding manifolds, wherein the number of the air feeding manifolds is the same as that of the detector modules; the air supply outlet of the air feeder is opposite to the static pressure box; the air inlet of the air supply manifold is communicated with the static pressure box; the air outlets of the air supply manifolds are opposite to the detector modules; the air supply manifolds correspond to the detector modules one to one; the areas of the air inlets of the air supply manifolds are the same;
except the longest air supply manifold, a necking air duct for balancing air duct along-way air pressure loss is arranged in the pipelines of all the other air supply manifolds; the necking duct is used to equalize the wind pressure loss in each of the supply manifolds.
Preferably, a filter screen is arranged in the static pressure box.
The invention also provides a design method of the heat dissipation device of the CT detector assembly, which comprises the following steps:
s1, calculating the on-way air pressure loss of airflow on each air supply manifold to obtain on-way resistance values in pipelines of each air supply manifold;
s2, calculating air pressure loss at the necking air channel in each air supply manifold to obtain a pressure loss value at the necking position in each air supply manifold;
s3, calculating the diameter of the neck air duct in each air supply manifold according to the on-way resistance value in each air supply manifold pipeline and the pressure loss value of the neck in each air supply manifold obtained in the step S1 and the step S2;
and S4, finishing the design of the heat dissipation device of the CT detector assembly according to the diameter value of the neck air duct in each air supply manifold obtained in the step S3.
Preferably, step S1 further comprises the steps of:
s11, calculating the Reynolds number Re,
wherein rho is air density and unit KG/M 2 (ii) a V is wind speed, unit is M 2 (ii) a d is the diameter of the air supply manifold, and the unit is M; eta is the aerodynamic viscosity coefficient;
s12, looking up the Modi diagram, looking up a corresponding abscissa on the Modi diagram, looking up a table of 'absolute roughness delta of the pipe wall of the pipeline', dividing the absolute roughness delta by the diameter d of the air supply manifold, and calculating delta/d, wherein the value of the delta/d corresponds to the right ordinate of the Modi diagram and a curve in the center of the region of the Modi diagram; correspondingly determining a point on the central curve of the Modi diagram area according to the Reynolds number Re of the abscissa obtained in the step S11 and the Delta/d of the ordinate on the right side, wherein the point corresponds to the on-way resistance coefficient lambda of the ordinate on the left side of the Modi diagram;
s13, according to the formula
Calculating on-way resistance values in each air supply manifold pipeline;
wherein λ is an on-way resistance coefficient of the air in the duct obtained in step S12, V is a wind speed, ρ is an air density, D is a diameter of the air supply manifold, and L is a length of the air supply manifold.
Preferably, step S2 further comprises the steps of:
s21, because the airflow passes through the neck-down air channel in each air supply manifold, according to the Bernoulli equation:
wherein p is 1 Is the pressure of the air flow at a point A before the air flow passes through the neck-down air duct in the air supply manifold 2 Is the pressure intensity, V, of the air flow passing through a point B at the neck-down duct in the supply manifold 1 And V 2 Flow velocities at the midpoint a and at the point B of the air flow, respectively, γ representing the gravity per unit volume of air, γ = ρ g, ρ is the air density, g is the gravitational acceleration, z is 1 And z 2 Are all constant;
s22, according to the Bernoulli equation in the step S21, obtaining the local loss of the variable diameter in the air supply manifold as follows:
because the air volume passing through the cross section at the point A and the point B is consistent, the following results are obtained:
V 1 A a ＝V 2 A b
wherein, A a Is the cross-sectional area at point A, A b The cross-sectional area at point B;
s23, consider A a And A b The distance between the sections is short, the surface forces on the side surfaces are disregarded, and the momentum equation is then obtained as:
P 1 A b -P 2 A b ＝ρV 2 A b (V 1 -V 2 )
the momentum equation and the continuous equation are introduced to obtain the pressure loss delta P at the necking air duct of each air supply manifold x ＝P 1 -P 2 ＝ρV 2 (V 1 -V 2 )，
Wherein, the longest air supply manifold is not provided with a necking air duct, so the total air pressure loss of the longest air supply manifold is P = [ delta ] P M I.e. by
Preferably, step S3 further comprises the steps of:
s31, setting the air duct length of the air supply manifold as L from long to short 1 ，L 2 ，L 3 ，L 4 ，……L n (ii) a The diameter of each air supply manifold at the non-necking air duct is D 1 Wherein, the longest air supply manifold is not provided with a necking air duct; the diameter of the necked air duct of the 2 nd to nth blowing manifolds is D 2 ，D 3 ，D 4 ，……，D n And the sectional area of the necking part of each air duct is obtained
S32, adding and equalizing the pressure loss at the necking air ducts of the air supply manifolds and the on-way resistance loss in the pipelines, namely P n ＝△P xn +△P Mn Equal; since the first section of the longest air supply manifold is not provided with a necking air duct, delta P x1 ＝0；
S33, let P 1 ＝P 2 ＝P 3 ……＝P n ，
Is finally obtained when
When the pressure loss in the nth section of air supply manifold is the same as that in the 1 st section of air supply manifold;
s34, mixing L 1 ，L n ，D 1 ，V 2 Substituting into formula
That is, the corresponding D can be calculated n The value is obtained.
Compared with the prior art, the invention has the beneficial effects that: (1) The invention adopts a blower to blow air into the detector through the blowing manifold, determines the number of air channels according to the number of detector modules, calculates the air resistance of different air channels based on the length of the air channels to determine the ventilation sectional areas of different air channels, and ensures that the ventilation volume in a plurality of air channels is basically consistent through calculation, thereby ensuring the constant temperature of each module; (2) The invention can be suitable for detectors with different specifications and is beneficial to reducing the noise of the detectors during operation.
Drawings
FIG. 1 is a schematic structural diagram of a heat dissipation device of a CT detector assembly according to the present invention;
FIG. 2 is a cross-sectional view of a supply manifold in accordance with the present invention at a necked air duct;
FIG. 3 is a Modi diagram.
In the figure: the air-conditioning system comprises an air feeder 1, a filter screen 2, a static pressure box 3, an air supply manifold 4, a CT detector 5 and a detector module 6.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention, the following description will explain the embodiments of the present invention with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
Example 1:
the heat dissipation device of the CT detector assembly shown in fig. 1 comprises a CT detector 5, wherein a plurality of detector modules 6 are arranged in the CT detector, and the heat dissipation device further comprises a blower 1, a plenum box 3 and a blower manifold 4 with the same number as the detector modules; the air supply outlet of the air feeder is opposite to the static pressure box; the air inlet of the air supply manifold is communicated with the static pressure box; the air outlets of the air supply manifolds are opposite to the detector modules; the air supply manifolds correspond to the detector modules one to one.
Wherein the blower adopts a direct-current centrifugal fan; the static pressure box is a necessary accessory for reducing dynamic pressure, increasing static pressure, stabilizing airflow and reducing airflow vibration of the air supply system, and the static pressure box can enable the air supply effect to be more ideal. A plenum box is a device that both allows airflow to pass through and effectively prevents or attenuates the outward propagation of acoustic energy.
Furthermore, the air inlets of the air supply manifolds have the same area. The inlet areas of the air supply manifolds are ensured to be the same, so that the inlet air quantity at the inlet of the air supply manifolds is ensured to be the same.
Furthermore, a necking air duct for balancing air duct along-way air pressure loss is arranged in each air supply manifold pipeline. The cross section of the necking air channel is calculated and adjusted to balance the on-way air pressure loss of the air channel, and the air resistance in each air supply manifold is kept the same, so that the air quantity and the air speed and the air pressure passing through each detector module are ensured to be consistent.
Further, a filter screen 2 is arranged in the static pressure box. A filter screen is designed in the static pressure box, and the filter screen can be cleaned by opening the static pressure box.
Based on embodiment 1, the invention further provides a design method of the heat dissipation device of the CT detector assembly, which comprises the following steps:
s1, calculating the on-way air pressure loss of air flow on each air supply manifold to obtain on-way resistance values in pipelines of each air supply manifold;
s2, calculating air pressure loss at the necking air channel in each air supply manifold to obtain a pressure loss value at the necking position in each air supply manifold;
s3, calculating the diameter of the neck air duct in each air supply manifold according to the on-way resistance value in each air supply manifold pipeline and the pressure loss value of the neck in each air supply manifold obtained in the step S1 and the step S2;
and S4, finishing the design of the heat dissipation device of the CT detector assembly according to the diameter value of the neck air duct in each air supply manifold obtained in the step S3.
Further, step S1 further includes the following steps:
s11, calculating the Reynolds number Re,
wherein rho is air density and unit KG/M 2 (ii) a V is wind speed, in M 2 (ii) a d is the diameter of the air supply manifold, and the unit is M; eta is the aerodynamic viscosity coefficient;
s12, looking up a Modi diagram which is shown in the figure 3, looking up a corresponding abscissa on the Modi diagram, looking up 'absolute roughness delta of the pipe wall of a pipeline', dividing the absolute roughness delta by the diameter d of the air supply manifold, and calculating delta/d, wherein the value of the delta/d corresponds to the right ordinate of the Modi diagram and a curve in the center of the Modi diagram area; correspondingly determining a point on the central curve of the Modisco image area by the Reynolds number Re of the abscissa and the Delta/d of the ordinate on the right side obtained in the step S11, wherein the point corresponds to the on-way resistance coefficient lambda of the ordinate on the left side of the Modisco image;
s13, according to the formula
Calculating on-way resistance values in each air supply manifold pipeline;
wherein λ is an on-way resistance coefficient of the air in the duct obtained in the step S12, V is a wind speed, ρ is an air density, D is a diameter of the air supply manifold, and L is a length of the air supply manifold.
Further, as shown in fig. 2, step S2 further includes the following steps:
s21, because the air flow passes through the inner neck contracted air duct of each air supply manifold, according to the Bernoulli equation:
wherein p is 1 Is the pressure of the air flow at a point A before the air flow passes through the neck-down air duct in the air supply manifold 2 Is the pressure intensity, V, of the air flow passing through a point B at the neck-down duct in the supply manifold 1 And V 2 Flow velocities at the midpoint a and at the midpoint B of the air flow, respectively, γ represents the gravity per unit volume of air, γ = ρ g, ρ is the air density, g is the acceleration of gravity, z is the acceleration of gravity 1 And z 2 Are all constant;
s22, according to the Bernoulli equation in the step S21, obtaining the local loss of the variable diameter in the air supply manifold as follows:
because the air volume passing through the cross section at the point A and the point B is consistent, the following results are obtained:
V 1 A a ＝V 2 A b
wherein A is a Is the cross-sectional area at point A, A b The cross-sectional area at point B;
s23, consider A a And A b The distance between the sections is short, the surface forces on the side surfaces are disregarded, and the momentum equation is then obtained as:
P 1 A b -P 2 A b ＝ρV 2 A b (V 1 -V 2 )
the momentum equation and the continuous equation are substituted to obtain the pressure loss delta P at the necking air duct of each air supply manifold x ＝P 1 -P 2 ＝ρV 2 (V 1 -V 2 )，
Wherein, the longest air supply manifold is not provided with a necking air duct, so the total air pressure loss of the longest air supply manifold is P = [ delta ] P M I.e. by
Further, step S3 further includes the following steps:
s31, setting the length of the air channel of the air supply manifold as L from long to short 1 ，L 2 ，L 3 ，L 4 ，……L n (ii) a The diameter of each air supply manifold at the non-necking air duct is D 1 Wherein, the longest air supply manifold is not provided with a necking air duct; the diameter of the necked air duct of the 2 nd to nth blowing manifolds is D 2 ，D 3 ，D 4 ，……，D n And the sectional area of the necking part of each air duct is obtained
S32, adding and equalizing the pressure loss at the necking air ducts of the air supply manifolds and the on-way resistance loss in the pipelines, namely P n ＝△P xn +△P Mn Equal; since the first section of the longest air supply manifold is not provided with a necking air duct, delta P x1 ＝0；
S33, let P 1 ＝P 2 ＝P 3 ……＝P n ，
Is finally obtained when
When the pressure loss in the nth section of air supply manifold is the same as that in the 1 st section of air supply manifold;
s34, mixing L 1 ，L n ，D 1 ，V 2 Substituting into formula
Then the corresponding D can be calculated n The value is obtained.
Said D n The value is the diameter value of the neck air duct in each air supply manifold. According to D n And the value data is used for finishing the design and the manufacture of the heat dissipation device of the CT detector assembly.
The invention comprises a blower, a filter screen, a static pressure box and a plurality of blower manifolds. The areas of the inlets of the manifolds are ensured to be the same, so that the air inlet amount at the inlets of the manifolds is ensured to be the same, and according to calculation, the shorter the manifold is, the smaller the air pressure loss in the pipeline is, the longer the manifold is, the larger the air pressure loss is, and if air enters a section of reduced section (as shown in fig. 2), certain pressure loss can be generated. The invention adds a necking air duct on the design of each manifold pipeline, balances the on-way air pressure loss of the air duct by calculating and adjusting the sectional area of the necking air duct, keeps the same wind resistance in each manifold, and ensures that the wind volume and the wind speed and the wind pressure of each air inlet module are consistent.
The invention adopts a blower to blow air into the detector through the blowing manifold, determines the number of air channels according to the number of detector modules, calculates the air resistance of different air channels based on the length of the air channels to determine the ventilation sectional areas of different air channels, and ensures that the ventilation volume in a plurality of air channels is basically consistent through calculation, thereby ensuring the constant temperature of each module; the invention can be suitable for detectors with different specifications and is beneficial to reducing the noise of the detectors during operation.
The foregoing has outlined rather broadly the preferred embodiments and principles of the present invention and it will be appreciated that those skilled in the art may devise variations of the present invention that are within the spirit and scope of the appended claims.
Claims (6)
- The heat dissipation device of the CT detector assembly comprises a CT detector, wherein a plurality of detector modules are arranged in the CT detector, and the heat dissipation device is characterized by further comprising an air feeder, a static pressure box and air feeding manifolds, wherein the number of the air feeding manifolds is the same as that of the detector modules; the air supply outlet of the air feeder is opposite to the static pressure box; the air inlet of the air supply manifold is communicated with the static pressure box; the air outlets of the air supply manifolds are opposite to the detector module; the air supply manifolds correspond to the detector modules one to one; the areas of the air inlets of the air supply manifolds are the same;except the longest air supply manifold, the pipelines of other air supply manifolds are provided with a necking air duct for balancing the air pressure loss along the air duct; the necking duct is used to equalize the wind pressure loss in each of the supply manifolds.
- 2. The heat sink assembly as recited in claim 1, wherein a filter screen is disposed in the static pressure chamber.
- 3. The method for designing the heat sink of the CT detector assembly according to claim 1, comprising the following steps:s1, calculating the on-way air pressure loss of airflow on each air supply manifold to obtain on-way resistance values in pipelines of each air supply manifold;s2, calculating air pressure loss at the necking air channel in each air supply manifold to obtain a pressure loss value at the necking position in each air supply manifold;s3, calculating the diameter of the neck air duct in each air supply manifold according to the on-way resistance value in each air supply manifold pipeline and the pressure loss value of the neck in each air supply manifold obtained in the step S1 and the step S2;and S4, finishing the design of the heat dissipation device of the CT detector assembly according to the diameter value of the neck air channel in each air supply manifold obtained in the step S3.
- 4. The method for designing a heat sink of a CT detector assembly according to claim 3, wherein the step S1 further comprises the steps of:s11, calculating the Reynolds number Re,wherein rho is air density and unit KG/M 2 (ii) a V is wind speed, in M 2 (ii) a d is the diameter of the air supply manifold, and the unit is M; eta is the aerodynamic viscosity coefficient;s12, looking up the Modi diagram, looking up a corresponding abscissa on the Modi diagram, looking up a table of 'absolute roughness delta of the pipe wall of the pipeline', dividing the absolute roughness delta by the diameter d of the air supply manifold, and calculating delta/d, wherein the value of the delta/d corresponds to the right ordinate of the Modi diagram and a curve in the center of the region of the Modi diagram; correspondingly determining a point on the central curve of the Modisco image area by the Reynolds number Re of the abscissa and the Delta/d of the ordinate on the right side obtained in the step S11, wherein the point corresponds to the on-way resistance coefficient lambda of the ordinate on the left side of the Modisco image;s13, according to the formulaCalculating on-way resistance values in each air supply manifold pipeline;wherein λ is an on-way resistance coefficient of the air in the duct obtained in the step S12, V is a wind speed, ρ is an air density, D is a diameter of the air supply manifold, and L is a length of the air supply manifold.
- 5. The method for designing the heat sink of the CT detector assembly according to claim 4, wherein the step S2 further comprises the steps of:s21, because the air flow passes through the inner neck contracted air duct of each air supply manifold, according to the Bernoulli equation:wherein p is 1 Is the pressure, p, of the air flow at point A before the air flow passes through the neck-down duct in the supply manifold 2 Is the pressure intensity V of the air flow passing through the point B at the neck-down air duct in the air supply manifold 1 And V 2 Flow velocities at the midpoint a and at the midpoint B of the air flow, respectively, γ represents the gravity per unit volume of air, γ = ρ g, ρ is the air density, g is the acceleration of gravity, z is the acceleration of gravity 1 And z 2 Are all constant;s22, according to the Bernoulli equation in the step S21, obtaining the local loss of the variable diameter in the air supply manifold as follows:because the air volume passing through the cross section at the point A and the point B is consistent, the following results are obtained:V 1 A a ＝V 2 A bwherein A is a Is at point ACross sectional area of (A) b Cross-sectional area at point B;s23, considering A a And A b The distance between the sections is short, the surface forces on the side surfaces are disregarded, and the momentum equation is then obtained as:P 1 A b -P 2 A b ＝ρV 2 A b (V 1 -V 2 )the momentum equation and the continuous equation are substituted to obtain the pressure loss delta P at the necking air duct of each air supply manifold x ＝P 1 -P 2 ＝ρV 2 (V 1 -V 2 )，Wherein, the longest air supply manifold is not provided with a necking air duct, so the total air pressure loss of the longest air supply manifold is P = [ delta ] P M I.e. by
- 6. The method for designing the heat sink of the CT detector assembly as claimed in claim 5, wherein the step S3 further comprises the steps of:s31, setting the length of the air channel of the air supply manifold as L from long to short 1 ，L 2 ，L 3 ，L 4 ，……L n (ii) a The diameter of each air supply manifold at the non-necking air duct is D 1 Wherein, the longest air supply manifold is not provided with a necking air duct; the diameter of the necked air duct of the 2 nd to nth blowing manifolds is D 2 ，D 3 ，D 4 ，……，D n And the sectional area of the necking part of each air duct is obtainedS32, adding and equalizing the pressure loss at the necking air ducts of the air supply manifolds and the on-way resistance loss in the pipelines, namely P n ＝△P xn +△P Mn Equal; since the first section of the longest air supply manifold is not provided with a necking air duct, delta P x1 ＝0；S33, let P 1 ＝P 2 ＝P 3 ……＝P n ，Is finally obtained whenMeanwhile, the pressure loss in the nth section of air supply manifold is the same as that in the 1 st section of air supply manifold;s34, mixing L 1 ，L n ，D 1 ，V 2 Substituting into formulaThat is, the corresponding D can be calculated n The value is obtained.
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| CN205030022U (en) * | 2015-08-04 | 2016-02-10 | 中国空间技术研究院 | Satellite ground testing cooling system |
| CN110806002A (en) * | 2019-11-26 | 2020-02-18 | 重庆大学 | Indoor air conditioner air current tissue induction device |
| CN211909514U (en) * | 2020-04-20 | 2020-11-10 | 固安福爱电子有限公司 | Ventilation and heat dissipation system for server room of data center |
| CN213100484U (en) * | 2020-10-23 | 2021-05-04 | 中核安科锐(天津)医疗科技有限责任公司 | Cooling system of spiral tomography radiotherapy equipment and spiral tomography radiotherapy equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111698892A (en) * | 2020-07-16 | 2020-09-22 | 西安交通大学 | Compact noise-suppression air cooling system and design method thereof |
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