CN219846599U - Detector heat abstractor and PET system - Google Patents

Abstract

The utility model discloses a detector heat dissipation device and a PET system, wherein the detector heat dissipation device comprises a detector heat dissipation plate, a heat dissipation fan and an air cooling element, the heat dissipation plate comprises a packaging part and a hollowed part, the packaging part is provided with a packaged cooling liquid flow passage, and the cooling liquid flow passage extends in a meandering manner; a heat radiation fan arranged at one end of the detector heat radiation plate; the air cooling element comprises a cold air fan and a fan mounting plate, an air cooling liquid flow passage is arranged on the periphery of the fan mounting plate, and the air cooling liquid flow passage is communicated with the cooling liquid flow passage through a connecting pipeline so as to cool the hollowed-out part. According to the utility model, the packaged cooling liquid flow passage is adopted to cool the detector to be cooled, and the cooling element is arranged to cool the air entering the detector to be cooled while the hot air in the detector is pumped by the cooling fan, so that the heat dissipation effect on the detector is improved, and the working performance of the detector is improved.

Description

Detector heat abstractor and PET system

Technical Field

The utility model relates to the field of medical instruments, in particular to a detector heat dissipation device and a PET system.

Background

At present, with the wide application of nuclear medicine technology in clinical diagnosis and life science research, positron Emission Tomography (PET) plays an increasingly important role in diagnosis and treatment of diseases. The detection device of the PET system comprises a scintillation crystal and a photoelectric conversion element, gamma rays are converted into visible light signals by the scintillation crystal, the visible light signals are further converted into scintillation pulse signals by the photoelectric conversion device, and then a series of application images can be obtained by sampling and processing the scintillation pulse signals.

Along with the improvement of the resolution requirements of the PET system, the data processing time is shortened, the chip operation requirements are higher and higher, and the problems of power consumption and heat dissipation are more and more prominent. Good heat dissipation is a precondition for ensuring high-efficiency operation of chips, and a heat dissipation scheme is always an important link that must be considered for products using chips.

The existing heat dissipation mode mainly comprises the steps of enabling a chip to be in contact with a water-cooling structural member through a metal daughter card heat dissipation plate, and enabling heat conducted by the chip to be taken away through circulation flow of cooling water.

In the dense layout of chips, the contact surface between the water-cooling structural member and the chips is smaller due to the limitation of space, so that the heat conduction efficiency is affected, and the cooling water cannot effectively bring out the heat of the chips. All components in the chip circuit have the heat dissipation requirement, but part of the components cannot dissipate heat through contact due to the self-protection requirement, the components heat air in a relatively sealed environment, and the internal air is in a high-temperature state after long-time use, so that the functions of the chip are affected.

The description of the background art is only for the purpose of facilitating an understanding of the relevant art and is not to be taken as an admission of prior art.

Disclosure of Invention

Accordingly, the present utility model is directed to a detector heat sink and a PET system that address at least one of the problems of the prior art.

According to a first aspect of the present utility model, there is provided a probe heat sink comprising: the detector cooling plate comprises a packaging part and a hollowed-out part, wherein the packaging part is provided with a packaged cooling liquid flow channel, and the cooling liquid flow channel extends in a meandering manner; a heat radiation fan arranged at one end of the detector heat radiation plate; the air cooling element is arranged at the hollowed-out part of the detector radiating plate and comprises a cold air fan and a fan mounting plate, the fan mounting plate is provided with an air cooling liquid flow passage, and the air cooling liquid flow passage is communicated with the cooling liquid flow passage through a connecting pipeline so as to cool the hollowed-out part.

According to an embodiment of the present utility model, the detector heat dissipation plate includes: the cooling device comprises a cooling plate main body and a packaging plate, wherein the cooling plate main body comprises a packaging part and a hollowed part, the surface of the packaging part is concaved downwards to form a groove, a guide piece is arranged in the groove to define a cooling liquid flow channel which extends in a winding way, and cooling liquid flows along the cooling liquid flow channel which extends in the winding way; the encapsulation plate covers the surface of the encapsulation part to form an encapsulated cooling liquid flow passage.

According to one embodiment of the utility model, the number of the hollowed-out parts is two, and the packaging parts are symmetrically arranged about the central connecting line of the two hollowed-out parts.

According to one embodiment of the utility model, the hollowed-out part is recessed relative to the surface of the detector heat dissipation plate to form an air cooling element accommodating part.

According to one embodiment of the utility model, a plurality of guide members are arranged, and the guide members are in a straight shape.

According to one embodiment of the utility model, the guide member comprises a side guide member and a middle guide member, wherein the side guide member is in a straight shape, the middle guide member is in a soil shape, and the hollowed-out part is arranged on the middle guide member.

According to one embodiment of the utility model, one end of the detector radiating plate, which is far away from the radiating fan, is provided with a cooling liquid inlet and a cooling liquid outlet, and the cooling liquid inlet and the cooling liquid outlet are arranged at intervals; a diversion channel is arranged between the cooling liquid flow channel and the cooling liquid inlet or the cooling liquid outlet.

According to one embodiment of the utility model, the joint end of the cooling liquid flow channel and the diversion channel is provided with a gradual change part, and the caliber of the gradual change part gradually decreases to be the same as the inner diameter of the cooling liquid flow channel along the extending direction from the joint end to the cooling liquid flow channel.

According to one embodiment of the present utility model, the cross section of the gradual change portion is a right triangle.

According to one embodiment of the present utility model, an angle formed between a hypotenuse of a right triangle of a cross section of the gradation portion and the heat dissipation plate main body is 30 degrees to 45 degrees.

According to one embodiment of the utility model, the flow guide channel is an L-shaped flow guide channel, and the joint end of the cooling liquid flow channel, which is jointed with the L-shaped flow guide channel, is set as a gradual change part.

According to one embodiment of the utility model, the cooling liquid flow channel has a rectangular, trapezoidal or polygonal cross section.

According to one embodiment of the utility model, the cross section of the cooling liquid flow channel is trapezoid, and the lower bottom of the trapezoid is the bottom of the cooling liquid flow channel.

According to one embodiment of the utility model, the cross section of the fan mounting plate is rectangular, four air-cooled liquid flow passages communicated with each other are circumferentially arranged, and the four air-cooled liquid flow passages are communicated with cooling liquid of the packaging part through connecting pipelines.

According to one embodiment of the utility model, the connecting pipeline comprises a liquid inlet pipeline and a liquid outlet pipeline, the liquid inlet pipeline and the liquid outlet pipeline are diagonally arranged, one ends of the liquid inlet pipeline and the liquid outlet pipeline are connected with the joint parts of the two air cooling liquid flow channels at the diagonal positions, and the other ends of the liquid inlet pipeline and the liquid outlet pipeline are communicated with the cooling liquid flow channels of the packaging part.

According to one embodiment of the utility model, the hollow units of the hollow grid part are isosceles triangles, and a plurality of hollow units are circumferentially arranged to form a ring shape.

According to a second aspect of the utility model there is provided a PET system comprising a detector heat sink according to any embodiment of the utility model.

In the embodiment of the utility model, the packaged cooling liquid flow passage is adopted to cool the detector to be cooled, and the cooling element is arranged to cool the air entering the detector to be cooled while the cooling fan sucks hot air in the detector, so that the heat dissipation effect on the detector is improved, and the working performance of the detector is improved.

Optional features and other effects of embodiments of the utility model are described in part below, and in part will be apparent from reading the disclosure herein.

Drawings

The accompanying drawings, in which like or similar reference numerals refer to like or similar elements and which are not limited to the scale shown in the drawings, illustrate embodiments of the utility model in detail, and wherein:

FIG. 1 is a schematic perspective view of a heat sink for a probe according to an embodiment of the utility model;

FIG. 2 is a front view of a heat sink of the probe according to the embodiment of FIG. 1;

FIG. 3 is a left side view of the probe heat sink according to the embodiment of FIG. 1;

FIG. 4 is a rear view of the probe heat sink according to the embodiment of FIG. 1;

FIG. 5 is a top view of a heat sink of the detector according to the embodiment of FIG. 1;

FIG. 6 is a bottom view of the probe heat sink according to the embodiment of FIG. 1;

FIG. 7 is an exploded view of a heat sink of the probe according to the embodiment of FIG. 1;

FIG. 8 is a cross-sectional view of a probe heat sink according to the embodiment of FIG. 7;

fig. 9 is a schematic perspective view of a heat dissipating plate body according to an embodiment of the present utility model;

fig. 10 is a schematic perspective view of an air cooling element according to an embodiment of the present utility model;

fig. 11 is a top view of an air cooling element according to the embodiment of fig. 10;

fig. 12 is a bottom view of an air cooling element according to the embodiment of fig. 10;

FIG. 13 is a cross-sectional view of the probe heat sink along the direction A-A in accordance with the embodiment of FIG. 2;

fig. 14 is a schematic perspective view of an adapting unit according to an embodiment of the present utility model;

fig. 15 is a front view of the adapter according to the embodiment of fig. 14;

fig. 16 is a cross-sectional view of the adapter according to the embodiment of fig. 15 in the direction B-B.

Detailed Description

The present utility model will be described in further detail with reference to the following detailed description and the accompanying drawings, in order to make the objects, technical solutions and advantages of the present utility model more apparent. The exemplary embodiments of the present utility model and the descriptions thereof are used herein to explain the present utility model, but are not intended to limit the utility model.

The term "comprising" and variations thereof as used herein means open ended, i.e., "including but not limited to. The term "or" means "and/or" unless specifically stated otherwise. The term "based on" means "based at least in part on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment. The term "another embodiment" means "at least one additional embodiment". The terms "first," "second," and the like, may refer to different or the same object. Other explicit and implicit definitions are also possible below.

Specific embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

Fig. 1 to 9 show the structure of a heat sink of a probe according to an embodiment of the present utility model. As shown in fig. 1 to 9, the probe heat sink 110 includes: the detector heat dissipation plate 101 comprises a packaging part 111 and a hollowed part 113, wherein the packaging part 111 is provided with a packaged cooling liquid flow passage 112, and the cooling liquid flow passage 112 extends in a meandering manner; a heat radiation fan 117 provided at one end of the probe heat radiation plate 101; an air cooling element 114, which is disposed at the hollowed-out portion 113 of the detector heat dissipation plate 101, wherein the air cooling element 114 includes a cold air fan 1141 and a fan mounting plate 1142, the fan mounting plate 1142 includes a fan mounting portion 11421, a hollowed-out grid portion 11422 corresponding to the fan mounting portion 11421, and an air cooling liquid flow channel 11423 disposed at the periphery of the fan mounting plate 1142, and the air cooling liquid flow channel 11423 is communicated with the cooling liquid flow channel 112 through a connecting pipe 1143 to cool the hollowed-out grid portion 11422; the packaging part 111 and the air cooling element 114 are both disposed on the same side of the detector heat dissipation plate 101, the heat dissipation fan 117 is disposed on the other side of the detector heat dissipation plate 101, the air is cooled to low-temperature air by the hollow grid part 11422 under the action of the cold air fan 1141, and the low-temperature air forms cold air through the hollow part 113 by the cold air fan 1141.

In the embodiment of the utility model, the detector to be cooled can be arranged on one side of the detector heat dissipation device, which is opposite to the air cooling element 114, and the bottom of the cooling liquid flow passage 112 is contacted with the detector to be cooled, so that the heat dissipation is carried out on the detector, the contact area between the cooling liquid flow passage 112 and the detector can be increased, and the cooling effect is improved; and the cooling liquid is transmitted in the packaged cooling liquid flow channel of the detector heat dissipation device 110, so that a water pipe is not required to be used for transmitting cooling water between the detector heat dissipation devices, complex pipeline design is avoided, the supply of the cooling liquid is simplified, and the equipment is concise. In addition, the detector to be cooled is not directly communicated with the cooling liquid flow channel, and the detector is directly disassembled and assembled when the detector is required to be maintained, so that the maintenance is very convenient.

In an example, referring to fig. 4-5, alternatively, the number of the heat dissipation fans 117 is two, and the two heat dissipation fans 117 are opposite and spaced apart. In the embodiment of the utility model, the detector is arranged on one side of the detector radiating device, which is opposite to the air cooling element, the interior of the detector is in a relatively airtight environment, when each component works, the air is heated to enable the interior air to be in a high-temperature state, and the radiating fan 117 is used for pumping out the high-temperature air in the detector, reducing the temperature in the detector and radiating the heat of the detector so as to improve the function of the detector.

In the embodiment of the utility model, the packaged cooling liquid flow passage 112 is adopted to cool the detector to be cooled, and the cooling element is arranged to cool the air entering the detector to be cooled while sucking hot air in the detector through the cooling fan, so that the heat dissipation effect on the detector is improved, and the working performance of the detector is improved.

In some embodiments, referring to fig. 1, the detector heatsink 101 includes: the heat sink body 1011 and the package plate 1012, the heat sink body 1011 includes the package portion 111 and the hollowed-out portion 113. Referring to fig. 9, the surface of the encapsulation 111 is concavely formed with a groove in which a guide 1110 is provided to define a serpentine cooling liquid flow passage 112, and the cooling liquid flows along the serpentine cooling liquid flow passage 112; the package plate 1012 covers the surface of the package portion 111 to form a packaged cooling liquid flow channel 112. Specifically, the package plate 1012 may be welded to the surface of the guide 1110 to form the hermetically sealed cooling liquid flow channel 112. In an embodiment of the present utility model, optionally, a part of the surface of the guide 1110 is convexly provided with a welding element 1111 for welding with a package board 1012, and the thickness of the package board 1012 is the same as the thickness of the welding element 1111 to realize a sealed packaged cooling liquid flow channel 112 by spot welding. In the embodiment of the utility model, the surface of the packaging part 111 is concaved downwards to form the groove, and the guide piece is arranged in the groove to form the cooling liquid flow channel, so that the cooling liquid flow channel can be directly contacted with the detector to be cooled, the heat dissipation effect on the detector is improved, and the working performance of the detector is improved.

In some alternative embodiments, grooves may be formed on the surface of the packaging part 111, and the guide 1110 is disposed in the grooves to form the cooling liquid channels 112.

In some embodiments, the cooling liquid flow passage 112 is rectangular or polygonal in cross-section.

In some embodiments, the cooling liquid flow channel 112 is trapezoidal in cross section, with the bottom of the trapezoid being the bottom of the cooling liquid flow channel. In the embodiment of the utility model, the detector to be cooled can be arranged on one side of the detector heat dissipation device, which is opposite to the air cooling element 114, and the bottom of the cooling liquid flow channel 112 is in contact with the detector to be cooled to dissipate heat of the detector.

In some embodiments, referring to fig. 1-4 and 7-9, alternatively, the number of the hollowed-out portions 113 is two, and the packaging portion 111 is symmetrically disposed about a central line of the two hollowed-out portions 113.

In one example, the hollowed-out portion 113 is recessed with respect to the surface of the probe radiation plate 101 to form an air-cooling element accommodating portion. Alternatively, the hollowed-out portion 113 may be flush with the surface of the probe radiation plate 101.

In some embodiments, a plurality of guides 1110 are provided, and the guides 1110 may each be in a straight shape.

In some alternative embodiments, referring to fig. 9, the guides 1110 include side guides 11111 and middle guides 11112. Alternatively, the side guides 11111 may be in a straight shape, and the middle guide 11112 may be in a ground shape. In the embodiment of the utility model, the detector to be cooled is arranged on one side of the main body of the heat dissipation plate, which is opposite to the packaging board 1012, and the middle guide member 11112 is shaped like a Chinese character 'tu', so that the bottom area of the cooling liquid flow channel 112 can be increased, the contact area between the cooling liquid flow channel 112 and the detector to be cooled is increased, and the heat dissipation energy of the detector is improved. In one example, the hollow portion 113 is disposed on the middle guide 11112.

In the embodiment of the present utility model, referring to fig. 4, a cooling liquid inlet 115 and a cooling liquid outlet 116 are disposed at one end of the detector heat dissipation plate 101 away from the heat dissipation fan 117, and the cooling liquid inlet 115 and the cooling liquid outlet 116 are spaced and disposed in parallel on the same side of the heat dissipation plate main body 1011; referring to fig. 13, a diversion channel 118 is disposed between the inlet of the cooling liquid flow channel 112 and the cooling liquid inlet 115, a junction end of the cooling liquid flow channel 112, which is joined to the diversion channel 118, is provided as a gradual junction 1121, and the caliber of the gradual junction 1121 is gradually reduced to be the same as the inner diameter of the cooling liquid flow channel 112 along the direction extending from the junction end to the cooling liquid flow channel 112. In the embodiment of the present utility model, by providing the gradual change portion, when the cooling liquid is transferred between the diversion channel 118 and the cooling liquid flow channel 112, the pressure loss can be reduced, and the cooling liquid is easy to be transferred between the diversion channel 118 and the cooling liquid flow channel 112, i.e. easy to enter the cooling liquid flow channel 112 from the diversion channel 118, or easy to enter the diversion channel 118 from the cooling liquid flow channel 112.

In some embodiments, the cross-section of the transition 1121 is a right triangle.

In some embodiments, the angle formed between the hypotenuse of the right triangle of the cross section of the gradation portion 1121 and the heat radiating plate main body is 30 degrees to 45 degrees. In the embodiment of the present utility model, the angle formed between the hypotenuse of the right triangle of the cross section of the gradual change portion 1121 and the main body of the heat dissipation plate refers to the angle between the hypotenuse of the right triangle of the cross section of the gradual change portion 1121 and the plane of the package board, and the angle is set to be 30-45 degrees, so that when the cooling liquid is transferred between the diversion channel 118 and the cooling liquid flow channel 112, the pressure loss is further reduced, and the cooling liquid is easy to enter the cooling liquid flow channel 112 from the diversion channel 118, or easy to enter the diversion channel 118 from the cooling liquid flow channel 112.

In some embodiments, the diversion channel 118 is an L-shaped diversion channel, and an engagement end of the cooling liquid flow channel 112 engaged with the L-shaped diversion channel is provided as a gradual change portion 1121.

In some embodiments, the L-shaped diversion channel 118 is integrally formed (not shown). Specifically, the L-shaped flow guide channel 118 includes a blocking portion and a hollow flow guide portion. In one example, the engagement section of the deflector portion with the plug portion is provided with a deflector through hole perpendicular to the deflector portion axis, the deflector through hole forming the cooling liquid outlet 116. In another example, the diversion channel 118 includes a blocking portion and a hollow diversion portion, and a side wall of a junction section of the diversion portion and the blocking portion is perforated with diversion holes, and the diversion holes form the cooling liquid outlet 116. The structure of the cooling liquid inlet 115 is referred to as the structure of the cooling liquid outlet 116, and will not be described here.

In some alternative embodiments, as shown in fig. 13, the diversion channel 118 includes a main body portion 1181 and an adapting portion 1182, wherein the main body portion 1181 is disposed on the heat dissipation plate main body 1011, and the adapting portion 1182 is adapted to be connected with the main body portion 1181.

In some embodiments, the fitting portion 1182 is threadably coupled to the body portion 1181. The assembly mode is simple in structure and convenient to operate.

In some embodiments, referring to fig. 14-16, the fitting 1182 includes a blocking portion 11821 and a hollow flow guiding portion 11822. In an example, a connection between the flow guiding portion 11822 and the blocking portion 11821 is provided with a flow guiding through hole perpendicular to an axis of the flow guiding portion 11822, and the flow guiding through hole forms the cooling liquid outlet 116 of the cooling liquid flowing out of the detector heat dissipating device 110. In an alternative example, the adapting portion 1182 includes a blocking portion 11821 and a hollow flow guiding portion 11822, and a side wall where the flow guiding portion 11822 is joined to the blocking portion 11821 is provided with a flow guiding hole in a penetrating manner, where the flow guiding hole forms the cooling liquid outlet 116. The structure of the cooling liquid inlet 115 is referred to as the structure of the cooling liquid outlet 116, and will not be described here.

In some embodiments, optionally, as shown in fig. 10-12, the fan mounting plate 1142 is rectangular in cross section, and is circumferentially provided with four air-cooled liquid flow passages 11423 communicating with each other, and the four air-cooled liquid flow passages 11423 communicate with the cooling liquid flow passages 112 of the package portion 111 through the connecting duct 1143. The fan mounting plate 1142 is provided with mounting holes 11424 for mounting the fan mounting plate 1142 to the package plate 1012 of the package portion 111.

In some embodiments, optionally, as in the example of the fan mounting plate 1142 shown in fig. 11-12 having a rectangular cross section, the connecting duct 1143 includes a liquid inlet duct 11431 and a liquid outlet duct 11432, the liquid inlet duct 11431 and the liquid outlet duct 11432 being diagonally disposed, and the liquid inlet duct 11431 and the liquid outlet duct 11432 having one end connected to the junction of the two air-cooled liquid flow passages 11423 at the diagonal and the other end communicating with the cooling liquid flow passage 112 of the package portion 111.

In an example, optionally, as shown in fig. 11-12, the hollow units of the hollow grid portion 11422 are isosceles triangles, and a plurality of hollow units are circumferentially arranged to form a ring shape. Alternatively, the hollowed-out mesh portion 11422 can be made of metal. In the embodiment of the utility model, the hollow grid portion 11422 made of metal is cooled by the cooling liquid in the four air-cooled liquid flow channels 11423 which are circumferentially arranged on the fan mounting plate 1142 and are communicated with each other, so that air is cooled into low-temperature air when passing through the hollow grid portion 11422 under the action of the cold air fan 1141, and the low-temperature air enters the detector to be cooled through the hollow portion 113, thereby improving the heat dissipation effect of the detector.

In some embodiments, there is also provided a PET system comprising a detector heat sink as described in the previous embodiments. In the PET system, the detector is cooled by the detector cooling device provided by the embodiment of the utility model, the detector to be cooled is water-cooled by adopting the packaged cooling liquid flow passage 112, hot air in the detector is pumped by the cooling fan, and meanwhile, the air entering the detector to be cooled is cold air by arranging the air cooling element 114, so that the cooling effect on the detector is improved, and the working performance of the detector is improved.

Various embodiments are described herein, but the description of the various embodiments is not exhaustive and the same or similar features or portions between the various embodiments may be omitted for the sake of brevity. Herein, "one embodiment," "some embodiments," "example," "specific example," or "some examples" means that it is applicable to at least one embodiment or example, but not all embodiments, according to the present utility model. The above terms are not necessarily meant to refer to the same embodiment or example. Those skilled in the art may combine and combine the features of the different embodiments or examples described in this specification and of the different embodiments or examples without contradiction.

The exemplary systems and methods of the present utility model have been particularly shown and described with reference to the foregoing embodiments, which are merely examples of the best modes for carrying out the systems and methods. It will be appreciated by those skilled in the art that various changes may be made to the embodiments of the systems and methods described herein in practicing the systems and/or methods without departing from the spirit and scope of the utility model as defined in the following claims.

Claims (16)

1. A heat sink for a detector, comprising:

the detector cooling plate comprises a packaging part and a hollowed-out part, wherein the packaging part is provided with a packaged cooling liquid flow channel, and the cooling liquid flow channel extends in a meandering manner;

a heat radiation fan arranged at one end of the detector heat radiation plate;

the air cooling element is arranged at the hollowed-out part of the detector radiating plate and comprises a cold air fan and a fan mounting plate, an air cooling liquid flow passage is arranged on the periphery of the fan mounting plate and communicated with the cooling liquid flow passage through a connecting pipeline so as to cool the hollowed-out part.

2. The detector heat sink of claim 1, wherein the detector heat sink comprises:

the cooling device comprises a cooling plate main body and a packaging plate, wherein the cooling plate main body comprises a packaging part and a hollowed part, the surface of the packaging part is concaved downwards to form a groove, a guide piece is arranged in the groove to define a cooling liquid flow channel which extends in a winding way, and cooling liquid flows along the cooling liquid flow channel which extends in the winding way; the encapsulation plate covers the surface of the encapsulation part to form an encapsulated cooling liquid flow passage.

3. The heat dissipating device for a probe according to claim 1 or 2, wherein the number of the hollowed-out parts is two, and the packaging parts are symmetrically arranged about a central connecting line of the two hollowed-out parts.

4. The heat dissipating device for a probe according to claim 1 or 2, wherein the hollowed-out portion is recessed with respect to a surface of the heat dissipating plate for the probe to form an air-cooled element accommodating portion.

5. The heat sink of claim 2, wherein a plurality of guides are provided, the guides being in a straight shape.

6. The heat dissipating device of claim 2, wherein the guide member comprises a side guide member and a middle guide member, the side guide member is in a shape of a Chinese character 'yi', the middle guide member is in a shape of a Chinese character 'tu', and the hollow portion is disposed on the middle guide member.

7. The heat dissipating device for a detector according to claim 2, wherein a cooling liquid inlet and a cooling liquid outlet are provided at an end of the heat dissipating plate for the detector away from the heat dissipating fan, the cooling liquid inlet and the cooling liquid outlet are provided at a distance from each other, and a flow guiding channel is provided between the cooling liquid flow channel and the cooling liquid inlet or the cooling liquid outlet.

8. The heat sink of claim 7, wherein the junction of the cooling fluid flow passage and the flow guide passage is configured as a gradual junction, the gradual junction having a diameter that tapers in a direction extending from the junction to the cooling fluid flow passage to be the same as an inner diameter of the cooling fluid flow passage.

9. The heat sink of claim 8, wherein the transition portion has a right triangle cross section.

10. The heat sink of claim 9, wherein an angle formed between a hypotenuse of a right triangle of the cross section of the gradation portion and the heat dissipating plate main body is 30 degrees to 45 degrees.

11. The heat sink of claim 7, wherein the flow guide channel is an L-shaped flow guide channel, and a junction end of the cooling liquid flow channel with the L-shaped flow guide channel is provided as a gradual change portion.

12. The detector heat sink of claim 1 wherein the cooling liquid flow passage is rectangular, trapezoidal or polygonal in cross-section.

13. The heat sink of claim 1, wherein the fan mounting plate is rectangular in cross section, and four air-cooled liquid flow passages communicating with each other are circumferentially provided, and the four air-cooled liquid flow passages communicate with the cooling liquid of the package portion through a connecting pipe.

14. The heat sink of claim 13, wherein the connecting duct includes a liquid inlet duct and a liquid outlet duct, the liquid inlet duct and the liquid outlet duct being diagonally disposed, one end of the liquid inlet duct and the liquid outlet duct being connected to a junction of two air-cooled liquid flow paths at the diagonal, and the other end being in communication with the cooling liquid flow path of the package.

15. The heat dissipating device of claim 1, wherein the hollow units of the hollow portion are isosceles triangles, and the plurality of hollow units are circumferentially arranged to form a ring shape.

16. A PET system comprising a detector heat sink as claimed in any one of claims 1 to 15.