Bolt pressing structure for combined cooler of nuclear power emergency diesel generating set

Abstract

The utility model provides a nuclear power emergency diesel generating set combined cooler bolt pressing structure which comprises a pressing bolt, and the pressing bolt comprises a bottom threaded section, a middle section and a top threaded section. The bottom threaded section is installed in the combined cooler lower plate, and the bottom threaded section and the top threaded section are connected through the middle section. The top threaded section is in threaded connection with a first nut, a second nut and a third nut, a combined cooler middle plate is installed between the first nut and the second nut, and lubricating oil / cooling water plates are installed on the combined cooler lower plate and the combined cooler middle plate; and a combined cooler upper plate is arranged between the second nut and the third nut, so that the pressing connection of the combined cooler lower plate, the lubricating oil / cooling water plate, the combined cooler middle plate and the combined cooler upper plate is completed. By the adoption of the novel compression bolts, when the combined cooler is installed, the fuel oil side plate and the lubricating oil side plate can be fastened through different tightening torques, and the installation reliability is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of bolt compression structures, and in particular relates to a bolt compression structure for a nuclear power emergency diesel generator set combined cooler. Background Art

[0002] The combined cooler for nuclear power emergency diesel generator sets utilizes a three-layer sandwich structure. The fuel oil / low-temperature water heat exchanger is located between the first and second plates, while the lubricating oil / low-temperature water heat exchanger is located between the second and third plates. The heat exchanger plates are constructed of stainless steel, effectively preventing corrosion from the media. Other components, such as the pressure plate, are constructed from materials that meet safety and reliability requirements for mechanical performance and seismic resistance. The plate-type heat exchanger boasts high heat transfer efficiency and minimal heat loss, resulting in a compact and compact design, easy maintenance, and enhanced flexibility.

[0003] Combined coolers handle three media with different operating pressures: 600kPa on the fuel side, 650kPa on the low-temperature water side, and 400kPa on the lubricating oil side. Traditional plate heat exchangers, on the other hand, only handle two media with different pressures. If a combined cooler uses the traditional upper and lower plate compression method, when the equipment is running, the pressure on the fuel side will be greater than the pressure on the lubricating oil side. This insufficient force will increase the gap between the fuel plates, pushing the center plate toward the lubricating oil side. This will compress the lubricating oil plates and cause leakage.

[0004] Based on this, a bolt tightening structure for the combined cooler of nuclear power emergency diesel generator sets was proposed. Utility Model Content

[0005] The technical problem to be solved by the present invention is to provide a nuclear power emergency diesel generator set combined cooler bolt tightening structure in view of the deficiencies of the above-mentioned prior art, so as to solve the problems raised in the above-mentioned background technology.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a nuclear power emergency diesel generator set combined cooler bolt clamping structure, including a clamping bolt, the clamping bolt including a bottom threaded section, a middle section and a top threaded section;

[0007] The bottom threaded section is installed in the lower plate of the combined cooler, and the bottom threaded section and the top threaded section are connected by an intermediate section;

[0008] The top threaded section is threadedly connected with a first nut, a second nut, and a third nut; a combined cooler middle plate is installed between the first nut and the second nut of the top threaded section; and lubricating oil / cooling water plates are installed on the combined cooler lower plate and the combined cooler middle plate;

[0009] The upper joint cooler upper plate is installed between the second nut and the third nut of the top threaded section, and the compression connection of the joint cooler lower plate, the oil / cooling water plate piece, the joint cooler middle plate and the joint cooler upper plate is completed through the compression bolts.

[0010] As a further description of the utility model, the diameter of the bottom threaded section and the top threaded section is the same, and the diameter of the middle section is smaller than that of the bottom threaded section.

[0011] As a further description of the utility model, the top of the top threaded section is provided with a square.

[0012] As a further description of the utility model, the compression bolts are eight, which are arranged around the joint cooler composed of the joint cooler lower plate, the oil / cooling water plate piece, the joint cooler middle plate and the joint cooler upper plate.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] 1. The utility model adopts the new compression bolts, and the joint cooler can be fastened by using different tightening torques for the oil side and the oil side plate piece during installation, thereby increasing the installation reliability.

[0015] 2. The utility model can determine the compression amount of the oil side and the oil side by adjusting the different threaded sections and the installation nuts, and the oil side and the oil side can be pressed according to different pressures required by the test when the joint cooler is tested, so that the deformation of the plate piece caused by the different pressures of the two sides during the test is avoided, the operability of the test is increased, and the risk of leakage is reduced.

[0016] 3. The compression bolts in the utility model can determine the compression amount of the plate piece again when the joint cooler is disassembled and reassembled, thereby ensuring the sealing property. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic diagram of the utility model in the whole use state;

[0018] Figure 2 is a schematic diagram of the compression bolt structure of the utility model;

[0019] Figure 3 is a front view of the utility model in the whole use state.

[0020] MARKING DESCRIPTION:

[0021] 1-Tightening bolt; 11-Bottom threaded section; 12-Middle section; 13-Top threaded section; 14-First nut; 15-Second nut; 16-Third nut; 17-Square; 2-Combined cooler lower plate; 3-Lubricating oil / cooling water plate; 4-Combined cooler middle plate; 5-Combined cooler upper plate. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] like Figure 1-3 As shown, the utility model provides a technical solution: a nuclear power emergency diesel generator set combined cooler bolt clamping structure, including a clamping bolt 1, the clamping bolt 1 includes a bottom threaded section 11, a middle section 12 and a top threaded section 13;

[0024] The bottom threaded section 11 and the top threaded section 13 have the same diameter, and the diameter of the middle section 12 is smaller than that of the bottom threaded section 11 , so that the middle section 12 can be easily pulled out during disassembly.

[0025] A square 17 is provided on the top of the top threaded section 13 to facilitate the use of an external tool to turn and rotate the compression bolt 1 .

[0026] The bottom threaded section 11 is installed in the combined cooler lower plate 2, and the bottom threaded section 11 and the top threaded section 13 are connected by the middle section 12. The top threaded section 13 is threaded with a first nut 14, a second nut 15 and a third nut 16. The combined cooler middle plate 4 is installed between the first nut 14 and the second nut 15 of the top threaded section 13. The lubricating oil / cooling water plate 3 is installed between the combined cooler lower plate 2 and the combined cooler middle plate 4. The combined cooler upper plate 5 is installed between the second nut 15 and the third nut 16 of the top threaded section 13. The combined cooler lower plate 2, the lubricating oil / cooling water plate 3, the combined cooler middle plate 4 and the combined cooler upper plate 5 are compressed and connected by the tightening bolt 1.

[0027] During the specific installation, prepare the lower plate 2 of the combined cooler and place it horizontally on the workbench; after stacking the lubricating oil / cooling water plates 3 along the positioning tooling, install the clamping bolt 1, with the end of the clamping bolt 1 with the square 17 facing upward, and screw the bottom threaded section 11 of the clamping bolt 1 into the bolt hole of the lower plate 2 of the combined cooler.

[0028] When screwing in, check the height between the top threaded section 13 of the compression bolt 1 and the plate. The compression bolt 1 should be 100 mm higher than the upper surface of the plate. Install the first nut 14 on the compression bolt 1 in sequence, screwing the first nut 14 from the top threaded section 13 on the compression bolt 1 until the first nut 14 is suspended in the middle section 12.

[0029] Next, install the combined cooler midplate 4 from above the compression bolts 1. Once the combined cooler midplate 4 is in place, screw in the second nut 15 again from the top threaded section 13 of the compression bolts 1. Use a wrench to turn the second nuts 15 sequentially until the oil / cooling water plates 3 are evenly compressed to the specified height. During compression, adjust the depth of the compression bolts into the combined cooler lower plate 2 using the square 17 at the top of the compression bolts 1. Ensure that the threads of the top threaded section 13 of the combined cooler midplate 4 are exposed at the bottom to ensure they are tightened.

[0030] After confirming that the compression height of the lubricating oil / cooling water plate 3 is within the specified range, apply thread locker to the first and second nuts 14, 15 of the combined cooler middle plate 4 and tighten them. After this, continue installing the fuel / cooling water plate on the upper surface of the combined cooler middle plate 4. Then, install the combined cooler upper plate 5 along the positioning fixture and compression bolts 1. Finally, install the third nut 16 on the compression bolts. Use a wrench to turn the third nut 16 sequentially until the fuel / cooling water plate is evenly compressed to the specified height. This completes the installation of compression bolts 1.

[0031] There are eight holding bolts 1 , which are arranged around the combined cooler consisting of a combined cooler lower plate 2 , a lubricating oil / cooling water plate 3 , a combined cooler middle plate 4 and a combined cooler upper plate 5 .

[0032] Under the working condition combination of deadweight + pressure + temperature + earthquake SL2 (level C), the stress conditions of the tightening bolts are shown in Table 1 below.

[0033] Table 1 Compression bolt load values

[0034]

[0035] Table 2 Calculation results and evaluation of compression bolt stress

[0036]

[0037] It can be seen from Table 2 that the tensile stress and shear stress of the combined cooler compression bolts meet the requirements of the following formula:

[0038]

[0039] Therefore, the hold-down bolt 1 is in a safe state.

[0040] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0041] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bolt tightening structure for a combined cooler of a nuclear power emergency diesel generator set, characterized by: It comprises a clamping bolt (1), wherein the clamping bolt (1) comprises a bottom threaded section (11), a middle section (12) and a top threaded section (13); The bottom threaded section (11) is installed in the lower plate (2) of the combined cooler, and the bottom threaded section (11) and the top threaded section (13) are connected via an intermediate section (12); The top threaded section (13) is threadedly connected with a first nut (14), a second nut (15) and a third nut (16); a combined cooler middle plate (4) is installed between the first nut (14) and the second nut (15) of the top threaded section (13); and lubricating oil / cooling water plates (3) are installed on the combined cooler lower plate (2) and the combined cooler middle plate (4); The combined cooler upper plate (5) is installed between the second nut (15) and the third nut (16) of the top threaded section (13), and the combined cooler lower plate (2), the lubricating oil / cooling water plate (3), the combined cooler middle plate (4) and the combined cooler upper plate (5) are compressed and connected by the compression bolts (1).

2. A nuclear power emergency diesel generator set combined cooler bolt pressing structure according to claim 1, characterized in that: The bottom thread segment (11) and the top thread segment (13) have the same diameter, and the middle segment (12) has a smaller diameter than the bottom thread segment (11).

3. The bolt pressing structure for a nuclear power emergency diesel generator set combined with a cooler according to claim 1, characterized in that: A square (17) is provided at the top of the top threaded section (13).

4. A nuclear power emergency diesel generator set combined cooler bolt pressing structure according to claim 1, characterized in that: There are eight clamping bolts (1) arranged around the combined cooler which is composed of a combined cooler lower plate (2), a lubricating oil / cooling water plate (3), a combined cooler middle plate (4) and a combined cooler upper plate (5).

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