1. A construction machine comprising:
a nearly sealed engine room section (30, 30a) where an engine (22) is disposed;
a first cooling unit group (R) comprising a plurality of cooling units; and
a single cooling fan (20) for cooling a second cooling unit group (R1) where some cooling units of said first cooling unit group (R) are disposed in parallel;
wherein said second cooling unit group (R1) and said cooling fan (20) are disposed so that they face each other.
2. A construction machine comprising:
a first cooling unit group (R) comprising a plurality of cooling units;
a cooling fan (20) for cooling a second cooling unit group (R1) where some cooling units of said first cooling unit group (R) are disposed in parallel;
an engine (20);
a partition member (26, 26A) provided between said cooling fan (20) and said engine (20);
a chamber (28), partitioned and formed by said partition member (26, 26A), where said first cooling unit group (R) and said cooling fan (20) are disposed; and
a nearly sealed engine room section (30, 30a), partitioned by said partition member (26, 26A), where said engine (22) is disposed;
wherein said cooling fan (20) comprises a single cooling fan (20).
3. The construction machine as set forth in claim 1 or 2, wherein said second cooling unit group (R1) and the remaining cooling unit (RN) of said first cooling unit group (R) are disposed so that they face each other.
4. The construction machine as set forth in claim 3, wherein a gap (D) is provided between said second cooling unit group (R1) and said remaining cooling unit (RN) so that cleaning can be performed.
5. The construction machine as set forth in claim 4, wherein a gap-closing cover (CV) is provided to nearly close at least the circumference of said gap (D) and is rotatable or detachable.
6. The construction machine as set forth in any one of claims 1 through 5, wherein a gap (D) between said second cooling unit group (R1) and the remaining cooling unit (RN) of said first cooling unit group (R) disposed so as to face said second cooling unit group (R1) is set so that a ratio of said gap (D) to a height (H) of a cooling unit of said second cooling unit group (R1) on the upstream side of said remaining cooling unit (RN) is (DH)0.05 to 0.3.
7. The construction machine as set forth in claim 6, wherein said gap (D) is set to about 30 to 300 mm, preferably about 40 to 100 mm.
8. The construction machine as set forth in claim 6 or 7, wherein said cooling unit of said second cooling unit group (R1) on the upstream side of said remaining cooling unit (RN) comprises an intercooler (14).
9. The construction machine as set forth in claim 2, 4, or 6, wherein said nearly sealed engine room section (30, 30a) is constructed so that cooling air introduced by said cooling fan (20) is drawn in, or is constructed so that it is ventilated by discharging cooling air within said nearly sealed engine room section (30, 30a), which has risen in temperature, from blow off bores (26b) of said partition member (26, 26A) with cooling air introduced by said cooling fan (20).
10. The construction machine as set forth in claim 1, 2, or 9, wherein said cooling fan (20) comprises an axial flow fan, a bent axis flow fan, or a centrifugal fan.
11. The construction machine as set forth in claim 1, 2, or 9, wherein said nearly sealed engine room section (30, 30a) is provided with an ejector (EJ).
12. The construction machine as set forth in claim 1, 2, 9, or 11, wherein said nearly sealed engine room section (30, 30a) is provided with an ejector (EJ) and a ventilating fan (20K, 20Ks).
13. The construction machine as set forth in claim 1, 2, 6, 7, 9, 11, or 12, further comprising cylindrical guide members (26R) which have a communicating bore corresponding and communicating with a communicating bore (26a) or blowoff bore (26b) provided in said partition member (26, 26a).
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. (canceled)
2. The reactor core according to claim 4,
wherein when said four fuel assemblies adjacent to said four lateral sides include three of said second fuel assemblies, an other fuel assembly among said four fuel assemblies is said first fuel assembly.
3. (canceled)
4. A reactor core comprising:
an outermost region;
a core region surrounded by said outermost region;
a plurality of fuel support members, each of which is disposed at a lower end portion of said outermost region and said core region; and
a plurality of fuel assemblies loaded in said outermost region and said core region and supported by said fuel support members;
wherein a plurality of said fuel assemblies disposed in said core region include a plurality of first fuel assemblies, each of which is inserted into a first coolant passage which is formed in said fuel support member and has a first resistor having an opening, and a plurality of second fuel assemblies, each of which is individually inserted into each of second coolant passage which is formed in said fuel support member and has a second resistor having an opening and a larger pressure loss than that of said first resistor; and
wherein four fuel assemblies are provided so that each of which is adjacent to each of four lateral sides of each of a plurality of first fuel assemblies and include either three or four second fuel assemblies;
wherein when a distance between a center of said core region and an axis of said fuel assembly located at a furthest position from said center of said core region among all of said fuel assemblies adjacent to said outermost region and disposed in said core region is represented as L, said core region includes an inner region wherein said fuel assemblies, each of which has said axis on an inner side of a L\u221a{square root over (2)} position in a radial direction of said core region from said center of said core region, are loaded, and an outer region surrounding said inner region; and
wherein said first fuel assemblies and said second fuel assemblies are arranged in said inner region, and said second fuel assemblies are arranged in said outer region including no said first fuel assemblies.
5. (canceled)
6. The reactor core according to claim 4,
wherein said first fuel assemblies, each of which is adjacent to either three or four of said second fuel assemblies, are all of said first fuel assemblies arranged in said inner region.
7. (canceled)
8. (canceled)
9. (canceled)
10. A reactor core, comprising:
an outermost region;
a core region surrounded by said outermost region;
a plurality of fuel support members, each of which is disposed at a lower end portion of said outermost region and said core region; and
a plurality of fuel assemblies loaded in said outermost region and said core region and supported by said fuel support members;
wherein a plurality of said fuel assemblies disposed in said core region include a plurality of first fuel assemblies, each of which is inserted a first coolant passage which is formed in said fuel support member and has a first resistor having an opening, and a plurality of second fuel assemblies, each of which is inserted into each of second coolant passage which is formed in said fuel support members and has a second resistor having an opening and a larger pressure loss than that of said first resistor;
wherein when a distance between a center of said core region and an axis of said fuel assembly located at a furthest position from said center of said core region among all of said fuel assemblies adjacent to said outermost region and disposed in said core region is represented as L, said core region includes an inner region wherein said fuel assemblies, each of which has said axis on an inner side of a L\u221a{square root over (2)} position in a radial direction of said core region from said center of said core region, are loaded, and an outer region surrounding said inner region;
wherein when a number of said first fuel assemblies among four of said fuel assemblies separately adjacent to four lateral sides of each of said first fuel assemblies is represented as \u03b1, an average number \u03b1 in said inner region is no greater than 0; and
wherein said second fuel assemblies are arranged in said outer region including no said first fuel assemblies.
11. (canceled)
12. The reactor core according to claim 4,
wherein said first fuel assemblies, each of which is adjacent to either three or four of said second fuel assemblies, are all of said first fuel assemblies arranged in said inner region.
13. (canceled)
14. The reactor core according to claim 4,
wherein said first fuel assembly is a fuel assembly having an in-core fuel dwelling time which is shorter than that of a core average.