Supercritical water-cooled reactor runner device

Abstract

The invention provides a supercritical water-cooled reactor runner device which comprises a hanging basket barrel, an upper pressing barrel and an isolation barrel, the hanging basket barrel is arranged on the inner side of a pressure container in a sleeving mode, and one end of the hanging basket barrel is connected with a reactor core lower plate; the upper pressing barrel is arranged on the inner side of the hanging basket barrel in a sleeved mode, the outer wall of the upper pressing barrel is attached to the inner wall of the hanging basket barrel, a first cavity is formed in the upper pressing barrel, and the hanging basket barrel and the upper pressing barrel are provided with circulation channels communicated with the first cavity and an inlet connecting pipe of a pressure container respectively. One end of the isolation cylinder is connected with the reactor core lower plate, the other end of the isolation cylinder penetrates through the first cavity and forms an outlet heat cavity in the first cavity, and the outlet heat cavity is communicated with an outlet connecting pipe of the pressure container; the lower part of the upper compression cylinder is connected with a first fuel assembly, one end of the first fuel assembly is communicated with the first chamber, the other end of the first fuel assembly is communicated with the lower chamber of the reactor core lower plate, a second fuel assembly is arranged in the isolation cylinder, one end of the second fuel assembly is communicated with the lower chamber, and the other end of the second fuel assembly is communicated with the outlet heat chamber.

Description

Technical Field

[0001] The invention relates to the technical field of supercritical water-cooled reactor flow channel design, and in particular to a supercritical water-cooled reactor flow channel device. Background Art

[0002] The supercritical water-cooled reactor is the only light water-cooled reactor among the six most promising candidate reactor types identified by the Generation IV International Forum.

[0003] The flow channel design in the reactor is an important part of the internal components of the reactor. The reactor needs to guide the coolant into the core and distribute the flow at the core inlet through the flow channel design in the reactor, ensuring that the flow distribution at the core inlet is as uniform as possible and within an acceptable range, so as to reduce the deviation of the flow at the inlet of a single component in adjacent fuel assemblies, thereby effectively limiting the wear of the fuel rods caused by vibration and preventing the power reduction during normal operation, ensuring the safety of the reactor operation. Traditional reactor flow channels are not suitable for supercritical water-cooled reactors.

[0004] Based on this, the inventor of the present application proposes a supercritical water-cooled reactor flow channel device in order to solve the above technical problems. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the defect that the traditional flow channel in the prior art cannot meet the requirements of the supercritical water-cooled reactor, and provide a.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] The present invention provides a supercritical water-cooled reactor flow channel device, which is characterized in that it includes:

[0008] The hanging basket cylinder is sleeved inside the pressure vessel, and one end is connected to the lower plate of the core;

[0009] An upper compression cylinder is sleeved inside the hanging basket cylinder, the outer wall of the upper compression cylinder is in contact with the inner wall of the hanging basket cylinder, a first chamber is provided inside the upper compression cylinder, and the hanging basket cylinder and the upper compression cylinder are provided with flow channels respectively connected with the first chamber and the inlet pipe of the pressure vessel;

[0010] An isolation tube, one end of which is connected to the lower core plate, and the other end of which is passed through the first chamber and forms an outlet hot chamber in the first chamber, wherein the outlet hot chamber is connected to the outlet pipe of the pressure vessel; wherein,

[0011] A first fuel assembly is connected to the lower portion of the upper compression cylinder, one end of the first fuel assembly is connected to the first chamber, and the other end is connected to the lower chamber of the lower plate of the core, and a second fuel assembly is arranged inside the isolation cylinder, one end of the second fuel assembly is connected to the lower chamber, and the other end is connected to the outlet hot chamber.

[0012] According to one embodiment of the present invention, a plurality of rows of first circulation units are arranged on the circumference of the upper compression cylinder, and each of the first circulation units is provided with at least one first circulation hole along the axial direction of the upper compression cylinder;

[0013] The circumference of the hanging basket cylinder is provided with a plurality of rows of second circulation units, and each of the second circulation units is provided with at least one second circulation hole along the circumference of the hanging basket cylinder;

[0014] The first circulation hole cooperates with the second circulation hole to form the circulation channel.

[0015] According to an embodiment of the present invention, one second circulation hole is correspondingly arranged for each of the first circulation holes, and the correspondingly arranged first circulation hole and the second circulation hole are coaxial.

[0016] According to an embodiment of the present invention, one second circulation hole is correspondingly arranged for each of the first circulation holes, and the correspondingly arranged first circulation holes and second circulation holes are arranged alternately.

[0017] According to one embodiment of the present invention, the first chamber forms an inlet cold chamber outside the isolation tube, and the coolant of the inlet pipe flows into the inlet cold chamber through the flow channel and flows downward to the lower chamber through the first fuel assembly.

[0018] According to one embodiment of the present invention, a first isolation plate is provided in the upper compression cylinder, and the top of the isolation cylinder is connected to the first isolation plate and enclosed with the first isolation plate to form the outlet heat chamber.

[0019] According to one embodiment of the present invention, a second isolation plate is provided on the top of the upper compression cylinder, a heat discharge chamber is formed between the first isolation plate and the second isolation plate, and at least one mounting hole communicating with the outlet heat chamber and the heat discharge chamber is provided on the first isolation plate;

[0020] The heat exhaust chamber is in communication with the outlet pipe.

[0021] According to one embodiment of the present invention, a guide tube is further installed on the top of the first fuel assembly, one end of the guide tube is connected to the first fuel assembly, and the other end of the guide tube is passed through the first isolation plate and connected to the second isolation plate;

[0022] The second isolation plate and the top cover of the pressure container enclose a containing cavity, and one end of the guide cylinder is connected to the containing cavity.

[0023] According to one embodiment of the present invention, an annular cavity is formed between the outer side of the hanging basket cylinder and the pressure vessel, and the inlet pipe is connected to the annular cavity;

[0024] A throttle plate is arranged in the annular cavity, a flow gap is opened on the throttle plate, and at least part of the coolant introduced by the inlet pipe flows to the lower chamber through the flow gap.

[0025] According to one embodiment of the present invention, at least one matching hole is further provided on the hanging basket cylinder, the matching hole connects the annular cavity and the accommodating cavity, and at least part of the coolant flowing into the inlet pipe flows into the accommodating cavity.

[0026] The positive and progressive effects of the present invention are:

[0027] The flow channel device of the supercritical water-cooled reactor of the present invention is provided with a circulation channel connected to the inlet pipe in the hanging basket cylinder and the upper pressing cylinder. The coolant enters the first fuel assembly through the circulation channel and flows downward to the lower chamber, then returns to the second fuel assembly and goes upward to enter the outlet hot chamber, and is finally discharged from the outlet pipe. In this way, not only can the dual-flow of the coolant in the reactor be realized, but also the flow distribution is more uniform and the structure is simpler and more compact, thereby meeting the flow channel design requirements of the water-cooled reactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0029] Figure 1 A cross-sectional view of a supercritical water-cooled reactor flow channel device according to the present invention at one angle;

[0030] Figure 2 It is an internal cross-sectional view at one angle of the flow channel device of a supercritical water-cooled reactor of the present invention;

[0031] Figure 3 for Figure 1 Axonometric view of the middle hanging basket cylinder;

[0032] Figure 4 for Figure 1 Axonometric view of the middle and upper compression cylinder;

[0033] Figure 5 for Figure 4 An angled cross-sectional view of the middle and upper compression cylinder.

[0034] 1. hanging basket cylinder; 11. second circulation unit; 111. second circulation hole; 12. matching hole;

[0035] 2. pressure vessel; 21. inlet pipe; 22. outlet pipe; 23. top cover of pressure vessel; 24. accommodating chamber; 25. annular chamber; 251. throttle plate; 252. flow gap; 26. lower chamber;

[0036] 3. Lower core plate;

[0037] 4. Upper compression cylinder; 41. First chamber; 42. First fuel assembly; 43. First circulation unit; 431. First circulation hole; 44. Inlet cold chamber; 45. First isolation plate; 451. Mounting hole; 46. Second isolation plate; 47. Exhaust hot chamber;

[0038] 5. Isolation cylinder; 51. Outlet hot chamber; 52. Second fuel assembly;

[0039] 6. Guide tube. DETAILED DESCRIPTION

[0040] The present invention is further described below in conjunction with specific embodiments and drawings. More details are elaborated in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description herein. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0042] Please refer to Figures 1 to 5 The present invention proposes a supercritical water-cooled reactor flow channel device, which includes a hanging basket cylinder 1, an upper pressing cylinder 4 and an isolation cylinder 5. The hanging basket cylinder 1 is sleeved on the inner side of the pressure vessel 2, and one end is connected to the lower plate 3 of the core; the upper pressing cylinder 4 is sleeved on the inner side of the hanging basket cylinder 1, and the outer wall of the upper pressing cylinder 4 is in contact with the inner wall of the hanging basket cylinder 1. The upper pressing cylinder 4 has a first chamber 41, and the hanging basket cylinder 1 and the upper pressing cylinder 4 are provided with flow channels respectively connected to the first chamber 41 and the inlet pipe 21 of the pressure vessel 2; one end of the isolation cylinder 5 is connected to the lower plate 3 of the core, and the other end is penetrated through the first chamber 41 and forms an outlet hot chamber 51 in the first chamber 41, and the outlet hot chamber 51 is connected to the outlet pipe 22 of the pressure vessel 2.

[0043] Among them, a first fuel assembly 42 is connected to the lower part of the upper compression cylinder 4, one end of the first fuel assembly 42 is connected to the first chamber 41, and the other end is connected to the lower chamber 26 of the core lower plate 3, and a second fuel assembly 52 is arranged inside the isolation cylinder 5, one end of the second fuel assembly 52 is connected to the lower chamber 26, and the other end is connected to the outlet hot chamber 51.

[0044] At present, all pressurized water reactors are single-flow reactor structures, that is, the coolant enters the annular cavity 25 formed with the internal components of the reactor from the inlet pipe of the pressure vessel 2 and then enters the core. The structural design of some supercritical water-cooled reactors adopts a pipe-type structure, which is very complex and not conducive to the overall layout and installation of the reactor.

[0045] Based on this, refer to Figure 1 In the present invention, an upper pressing cylinder 4 is arranged in the hanging basket cylinder 1, and a circulation channel is formed between the hanging basket cylinder 1 and the upper pressing cylinder 4. The coolant of the inlet pipe 21 can enter the first chamber 41 through the circulation channel, and flow downward to the lower chamber 26 through the first fuel assembly 42 arranged below the first chamber 41. The coolant in the lower chamber 26 enters from the bottom of the second fuel assembly 52 arranged in the isolation cylinder 5 and reaches the outlet hot chamber 51 after upward heating, and is finally discharged outward from the outlet pipe 22.

[0046] It can be seen that the flow channel arrangement of the hanging basket cylinder 1, the upper compression cylinder 4 and the isolation cylinder 5 of the present invention satisfies the dual-flow flow of the coolant in the pile, which is conducive to making the flow distribution in the pile more uniform. Compared with the pipe-type inlet flow channel, the installation is also more convenient and the structure is simpler and more compact.

[0047] The top of the basket cylinder 1 is connected to the flange of the inner wall of the pressure vessel 2, for example, it is mounted on the upper end surface of the pressure vessel flange and connected through a connector. The bottom of the basket cylinder 1 is connected to the lower core plate 3. The basket cylinder 1 is used to transfer the core and other design loads to the upper compression cylinder 4, and finally to the pressure vessel 2.

[0048] Most of the coolant enters the first chamber 41 through the circulation channel, and is then reasonably distributed from top to bottom as a first-flow coolant and transferred to the lower chamber 26 through the first fuel assembly 42. After all the coolant is collected in the lower chamber 26, it flows from bottom to top as a second-flow coolant through the second fuel assembly 52 and is discharged from the outlet pipe 22.

[0049] As for the upper compression cylinder 4, the top of the upper compression cylinder 4 is connected to the hanging basket cylinder 1, and then connected to the pressure vessel 2 through the top flange of the hanging basket cylinder 1. The upper compression cylinder 4 is used to realize the compression of the reactor core and transmit the dynamic load of the control rod, the fuel assembly load and other loads to the pressure vessel 2.

[0050] Please refer to Figures 3 to 5 A plurality of rows of first flow units 43 are arranged on the circumference of the upper compression cylinder 4, and each first flow unit 43 is provided with at least one first flow hole 431 along the axial direction of the upper compression cylinder 4; a plurality of rows of second flow units 11 are arranged on the circumference of the hanging basket cylinder 1, and each second flow unit 11 is provided with at least one second flow hole 111 along the circumference of the hanging basket cylinder 1; the first flow holes 431 cooperate with the second flow holes 111 to form a flow channel.

[0051] Multiple rows of first circulation units 43 are evenly spaced around the circumference of the upper compression cylinder 4, so that the coolant enters more evenly; similarly, multiple rows of second circulation units 11 are evenly spaced around the circumference of the hanging basket cylinder 1, so that the coolant enters more evenly.

[0052] That is, the number of the first circulation units 43 and the second circulation units 11 can be set according to actual needs, and is not limited here.

[0053] Please continue to refer to Figure 3 and Figure 4 Each first circulation unit 43 is provided with a plurality of first circulation holes 431 at axial intervals along the upper compression cylinder 4, and correspondingly, each second circulation unit 11 is provided with a plurality of second circulation holes 111 at axial intervals along the hanging basket cylinder 1. Here, the number of the first circulation holes 431 and the second circulation holes 111 is described as three as an example, but the specific number can be adjusted according to the actual flow demand and is not limited here.

[0054] In one embodiment, each first circulation hole 431 is correspondingly provided with a second circulation hole 111 , and the correspondingly provided first circulation hole 431 is coaxial with the second circulation hole 111 .

[0055] Alternatively, in some other embodiments, each first circulation hole 431 is correspondingly provided with a second circulation hole 111 , and the correspondingly provided first circulation holes 431 and second circulation holes 111 are alternately provided.

[0056] It can be seen that in order to ensure that the coolant in the inlet pipe 21 can smoothly enter the first chamber 41, the first flow hole 431 and the second flow hole 111 need to be at least partially connected. In this way, the size and relative position relationship of the first flow hole 431 and the second flow hole 111 can be adjusted according to actual flow requirements. For example, the first flow hole 431 and the second flow hole 111 have the same diameter and are coaxially arranged, which can ensure the demand for a larger flow rate.

[0057] Alternatively, the sizes of the first flow hole 431 and the second flow hole 111 are set to be inconsistent, so that the flow rate entering the first chamber 41 can be adjusted. The specific setting method is only given as an example and is not limited.

[0058] Please continue to refer to Figure 1 and Figure 2 The first chamber 41 forms an inlet cold chamber 44 outside the isolation tube 5 , and the coolant of the inlet pipe 21 flows into the inlet cold chamber 44 through the circulation channel, and flows downward to the lower chamber 26 through the first fuel assembly 42 .

[0059] The isolation tube 5 is provided to separate the inlet cold chamber 44 and the outlet hot chamber 51, thereby ensuring that the outlet temperature meets the requirements.

[0060] At the same time, the isolation tube 5 also separates the first fuel assembly 42 and the second fuel assembly 52. ​​For example, different types of fuel assemblies can be selected to meet different heating requirements.

[0061] Please continue to refer to Figure 1 and Figure 2 A first isolation plate 45 is provided in the upper compression cylinder 4 , and the top of the isolation cylinder 5 is connected to the first isolation plate 45 and enclosed with the first isolation plate 45 to form an outlet hot chamber 51 .

[0062] The first isolation plate 45 and the upper compression cylinder can be connected by welding. The first isolation plate 45 is used to cooperate with the upper compression cylinder 4 to form an outlet heat chamber 51.

[0063] Specifically, a second isolation plate 46 is provided on the top of the upper compression cylinder 4, and a heat discharge chamber 47 is formed between the first isolation plate 45 and the second isolation plate 46. The first isolation plate 45 is provided with at least one mounting hole 451 connected with the outlet heat chamber 51 and the heat discharge chamber 47; the heat discharge chamber 47 is connected with the outlet pipe 22.

[0064] That is, the coolant heated by the second fuel assembly 52 first flows into the outlet heat chamber 51 , then flows to the outlet heat chamber 47 through the first mounting hole 451 , and then is discharged to the outside of the pressure vessel 2 from the outlet pipe 22 .

[0065] Please refer to Figure 2 A guide tube 6 is also installed on the top of the first fuel assembly 42. One end of the guide tube 6 is connected to the first fuel assembly 42, and the other end is passed through the first isolation plate 45 and connected to the second isolation plate 46; the second isolation plate 46 and the pressure vessel top cover 23 enclose a receiving cavity 24, and one end of the guide tube is connected to the receiving cavity 24.

[0066] The guide tube 6 and the first fuel assembly 42 may be integrally provided or connected by a mounting flange using a threaded connector, which is not limited here.

[0067] Furthermore, an annular cavity 25 is formed between the outer side of the hanging basket cylinder 1 and the pressure vessel 2, and the inlet connecting pipe 21 is connected to the annular cavity 25; a throttle plate 251 is provided in the annular cavity 25, and a flow gap 252 is opened on the throttle plate 251, and at least part of the coolant introduced into the inlet connecting pipe 21 flows to the lower chamber 26 through the flow gap 252.

[0068] The annular cavity 25 is provided to buffer the incoming coolant, thereby improving the stability of the coolant entering the first chamber 41. At the same time, a throttle plate 251 is provided in the annular cavity 25, so that part of the coolant can flow along the inner wall of the pressure vessel 2 to the lower chamber 26, so that the relatively low-temperature imported coolant can cool the inner wall of the pressure vessel 2 to meet the use requirements of the pressure vessel 2 material.

[0069] It should be noted that at least one matching hole 12 is also provided on the hanging basket cylinder 1 , and the matching hole 12 connects the annular cavity 25 and the accommodating cavity 24 , and at least part of the coolant flowing into the inlet pipe 21 flows into the accommodating cavity 24 .

[0070] That is, the coolant flowing in through the inlet pipe 21 can flow through the matching hole 12 to the accommodating chamber 24 for storage. When a serious accident occurs in the core, the coolant in the accommodating chamber 24 can act as a water tank and flow to the core through the guide tube 6 and the first fuel assembly 42, thereby slowing down the progress of the accident.

[0071] In summary, in the flow channel device of a supercritical water-cooled reactor of the present invention, the hanging basket cylinder 1 and the upper compression cylinder 4 are provided with a circulation channel connected to the inlet pipe 21. The coolant enters the first fuel assembly 42 through the circulation channel and flows downward to the lower chamber 26, and then returns to the second fuel assembly 52 and ascends to enter the outlet hot chamber 51, and is finally discharged from the outlet pipe 22. This not only realizes the dual-flow flow of the coolant in the reactor, but also makes the flow distribution more uniform, and the structure is simpler and more compact, thereby meeting the flow channel design requirements of the water-cooled reactor.

[0072] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "install", "connect", "connect", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0073] The present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or multiple times in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0074] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A supercritical water-cooled reactor flow channel device, characterized in that: include: The hanging basket cylinder is sleeved inside the pressure vessel, and one end is connected to the lower plate of the core; An upper compression cylinder is sleeved inside the hanging basket cylinder, the outer wall of the upper compression cylinder is in contact with the inner wall of the hanging basket cylinder, a first chamber is provided inside the upper compression cylinder, and the hanging basket cylinder and the upper compression cylinder are provided with flow channels respectively connected with the first chamber and the inlet pipe of the pressure vessel; An isolation tube, one end of which is connected to the lower core plate, and the other end of which is passed through the first chamber and forms an outlet hot chamber in the first chamber, wherein the outlet hot chamber is connected to the outlet pipe of the pressure vessel; wherein, A first fuel assembly is connected to the lower portion of the upper compression cylinder, one end of the first fuel assembly is connected to the first chamber, and the other end is connected to the lower chamber of the lower plate of the core, and a second fuel assembly is arranged inside the isolation cylinder, one end of the second fuel assembly is connected to the lower chamber, and the other end is connected to the outlet hot chamber.

2. The supercritical water-cooled reactor flow channel device according to claim 1, characterized in that: The upper compression cylinder is provided with a plurality of rows of first circulation units on the circumference thereof, and each of the first circulation units is provided with at least one first circulation hole along the axial direction of the upper compression cylinder; The circumference of the hanging basket cylinder is provided with a plurality of rows of second circulation units, and each of the second circulation units is provided with at least one second circulation hole along the circumference of the hanging basket cylinder; The first circulation hole cooperates with the second circulation hole to form the circulation channel.

3. The supercritical water-cooled reactor flow channel device according to claim 2, characterized in that: One second circulation hole is correspondingly arranged for each of the first circulation holes, and the correspondingly arranged first circulation hole and the second circulation hole are coaxial.

4. The supercritical water-cooled reactor flow channel device according to claim 2, characterized in that: One second circulation hole is correspondingly arranged for each of the first circulation holes, and the correspondingly arranged first circulation holes and second circulation holes are arranged alternately.

5. The supercritical water-cooled reactor flow channel device according to claim 1, characterized in that: The first chamber forms an inlet cold chamber outside the isolation tube, and the coolant of the inlet pipe flows into the inlet cold chamber through the flow channel and flows downward to the lower chamber through the first fuel assembly.

6. The supercritical water-cooled reactor flow channel device according to claim 1, characterized in that: A first isolation plate is disposed in the upper compression cylinder, and the top of the isolation cylinder is connected to the first isolation plate and enclosed with the first isolation plate to form the outlet heat chamber.

7. The supercritical water-cooled reactor flow channel device according to claim 6, characterized in that: A second isolation plate is provided on the top of the upper compression cylinder, a heat discharge chamber is formed between the first isolation plate and the second isolation plate, and at least one mounting hole communicating with the outlet heat chamber and the heat discharge chamber is provided on the first isolation plate; The heat exhaust chamber is in communication with the outlet pipe.

8. The supercritical water-cooled reactor flow channel device according to claim 7, characterized in that: A guide tube is also installed on the top of the first fuel assembly, one end of the guide tube is connected to the first fuel assembly, and the other end of the guide tube is passed through the first isolation plate and connected to the second isolation plate; The second isolation plate and the top cover of the pressure container enclose a containing cavity, and one end of the guide cylinder is connected to the containing cavity.

9. The supercritical water-cooled reactor flow channel device according to claim 8, characterized in that: An annular cavity is formed between the outer side of the hanging basket cylinder and the pressure vessel, and the inlet pipe is connected to the annular cavity; A throttle plate is arranged in the annular cavity, a flow gap is opened on the throttle plate, and at least part of the coolant introduced by the inlet pipe flows to the lower chamber through the flow gap.

10. The supercritical water-cooled reactor flow channel device according to claim 9, characterized in that: At least one matching hole is also formed on the cylinder body of the hanging basket, and the matching hole communicates with the annular cavity and the accommodating cavity, so that at least part of the coolant flowing into the inlet pipe flows into the accommodating cavity.

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