Heat exchanger for nuclear power air conditioning unit

Abstract

The utility model discloses a heat exchanger for a nuclear power air conditioning unit, which comprises a heat transfer pipe, a copper protective plate and the like, adopts the heat transfer pipe with an elliptical section, and improves the operation reliability, reduces the air side flow resistance and improves the heat exchange effect by adopting a pipe distribution mode that the heat transfer pipe is gradually reduced in height along the flowing direction of refrigerant water. The contact area of the heat transfer tube and the frame is increased by using the copper protective plate, so that the direct contact between the heat transfer tube and the frame is avoided during tube penetration, tube expansion, transportation and operation of the heat exchanger.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat exchange and relates to a heat exchanger for a nuclear power air-conditioning unit. Background Art

[0002] Heat exchangers are currently widely used in nuclear power plant ventilation systems. They operate as coolers, cooling air passing through the heat exchanger fins with cold water and as heaters, heating the air with hot water. This ensures that the ventilation and air conditioning system meets the air temperature and humidity control requirements. Nuclear power heat exchangers are generally designed for a lifespan of 40 years or more. Because nuclear power plants place great importance on the safety and stability of their equipment, heat exchangers must maintain functional and structural integrity while stationary or operating, even during and after seismic loads, to ensure long-term safe and stable operation.

[0003] Prior art 1 "CN218764703U A circular heat exchanger, published on March 28, 2023" discloses a heat exchanger composed of baffles, copper tubes, etc., which are prone to some problems during use. For example, during operation, the joints between the heat transfer copper tubes and the baffle perforations are in a low-frequency vibration state for a long time, which can easily cause the copper tubes to be cut and leak. In the process of tube insertion, tube expansion, transportation and operation of the heat exchanger, the direct contact between the heat transfer copper tubes and the baffles can also cause wear, strain and cracks on the heat transfer tubes. The copper tubes in the heat exchanger are often round tubes (with a circular radial cross-section), but the air resistance of the round tubes is large, and there are dead corners in the leeward side where the wind cannot reach, thereby generating vortices, resulting in low overall energy efficiency of the heat exchanger. In a free static state, the hot and cold media are not easy to be discharged from the water inlet or outlet, resulting in the hot and cold media remaining in the heat exchanger for a long time, corroding the pipes, further causing leakage problems, and greatly affecting its service life. Summary of the Invention

[0004] In order to achieve the above-mentioned purpose, the utility model provides a heat exchanger for a nuclear power air-conditioning unit, which solves the problems existing in the prior art.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A heat exchanger for a nuclear power air conditioning unit includes a water inlet valve, a water outlet valve, a water inlet main pipe, and a water outlet main pipe. The water inlet valve is connected to the water inlet main pipe, the water outlet valve is connected to the water outlet main pipe, and the water inlet main pipe and the water outlet main pipe are connected to a heat transfer pipe.

[0007] The left frame, the upper frame, the right frame and the lower frame are connected in pairs to form a heat exchanger frame, the frame is fixed by screws, and a fin is arranged in the middle of the frame.

[0008] The heat transfer pipe passes through the two rows of openings on the outer side of the left frame and is connected to the water inlet main pipe and the water outlet main pipe, and passes through the two rows of openings on the inner side and is connected to the heat transfer pipe elbow.

[0009] The heat transfer pipe passes through the right frame opening and is connected to the heat transfer pipe elbow.

[0010] Preferably, there are four rows of openings on the left frame and the right frame, and the copper guard plate passes through the openings and is arranged in the left frame and the right frame.

[0011] Preferably, the cross section of the heat transfer tube is elliptical.

[0012] Preferably, the heat transfer tubes are arranged in a staggered manner, and the heat transfer tubes are connected to the heat transfer tube bends step by step downward.

[0013] Preferably, the major axis of the ellipse of the heat transfer tube is 7.5 mm, and the minor axis is 7 mm.

[0014] The beneficial effects of the utility model are:

[0015] This utility model uses copper guard plates to increase the contact area between the heat transfer tubes and the frame, thereby preventing direct contact between the heat transfer tubes and the frame during pipe insertion, expansion, transportation, and operation, which could lead to wear, strain, and cracking of the heat transfer tubes, thereby improving the reliability of the heat exchanger. By adopting a new elliptical cross-section heat transfer tube, the structure is compact, the windward area is reduced, the air-side flow resistance is reduced, and the heat exchange efficiency is improved, saving heat exchanger materials while reducing air conditioner power consumption. By adopting a piping method in which the heat transfer tubes are arranged in a step-by-step manner along the flow direction of the refrigerant water, the hot and cold media can be discharged from the water inlet or outlet in a free and static state, preventing the hot and cold media from being retained in the heat exchanger for a long time and corroding the pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is the main view of the heat exchanger of the utility model;

[0018] Figure 2 This is a left view of the heat exchanger of the utility model;

[0019] Figure 3 This is a top view of the heat exchanger of the utility model;

[0020] Figure 4 This is a right side view of the heat exchanger of the utility model;

[0021] Figure 5 It is a schematic diagram of the copper guard plate of the utility model;

[0022] Figure 6 It is a schematic diagram of the medium flow in the left view of the utility model.

[0023] In the figure, 1. Water inlet valve; 2. Water outlet valve; 3. Water inlet main pipe; 4. Water outlet main pipe; 5. Heat transfer tube; 6. Heat transfer tube elbow; 7. Left frame; 8. Upper frame; 9. Right frame; 10. Lower frame; 11. Fins; 12. Copper guard plate; 13. Screws. DETAILED DESCRIPTION

[0024] 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.

[0025] like Figures 1 to 6 As shown, the utility model provides a heat exchanger for a nuclear power air conditioning unit, comprising a water inlet valve 1, a water outlet valve 2, a water inlet main pipe 3, and a water outlet main pipe 4;

[0026] The water inlet valve 1 is connected to the water inlet main pipe 3;

[0027] The water outlet valve 2 is connected to the water outlet main pipe 4;

[0028] There are several branch pipes on the water inlet main pipe 3 and the water outlet main pipe 4;

[0029] The left frame 7, the upper frame 8, the right frame 9 and the lower frame 10 are connected in pairs to form a heat exchanger frame, which is fixed by screws 13. A fin 11 is provided in the middle of the frame; Figure 1 The middle fin 11 is drawn in a simplified manner, please refer to the actual Figure 4 ;

[0030] There are four rows of openings on the left frame 7 and the right frame 9, and the copper guard plate 12 passes through the openings and is arranged in the left frame 7 and the right frame 9;

[0031] Several heat transfer tubes 5 pass through the two rows of openings on the outside of the left frame 7 and are connected to the water inlet main pipe 3 and the water outlet main pipe 4. Several heat transfer tubes 5 pass through the two rows of openings on the inside of the left frame 7 and are connected to the heat transfer tube elbow 6.

[0032] The plurality of heat transfer tubes 5 pass through the opening of the right frame 9 and are connected to the heat transfer tube elbow 6;

[0033] The cross-section of the heat transfer tubes 5 is elliptical, with the major axis of the ellipse being 7.5 mm and the minor axis being 7 mm;

[0034] According to the approximate formula for the circumference of an ellipse, the circumference of the ellipse in this application is:

[0035] ;

[0036] In the formula, a is the semi-major axis of the ellipse, and b is the semi-minor axis;

[0037] If the tube length is taken as L, the windward area is reduced by 48% compared with a circular tube of the same size, which can greatly reduce air resistance.

[0038] like Figure 6 As shown, the heat transfer tubes 5 of the present invention are arranged in a staggered manner, the heat transfer tube bends 6 are arranged obliquely, and the heat transfer tubes 5 and the heat transfer tube bends 6 are connected downward step by step.

[0039] Working principle: The medium flows into the water inlet main pipe 3 from the water inlet valve 1, and flows into the heat transfer tube 5 and the heat transfer tube elbow 6 in sequence after diversion. After internal circulation, it is collected in the water outlet main pipe 4 and finally flows out through the water outlet valve 2. The air enters the heat exchanger through the fins 11, exchanging the heat of the medium in the tube with the outside air to achieve the purpose of heat dissipation or heat absorption.

[0040] Each embodiment in this specification is described in a related manner. The same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are included in the scope of protection of the present invention.

Claims

1. A heat exchanger for a nuclear power air conditioning unit, comprising a water inlet valve (1), a water outlet valve (2), a water inlet main pipe (3), and a water outlet main pipe (4), characterized in that: The water inlet valve (1) is connected to the water inlet main pipe (3), the water outlet valve (2) is connected to the water outlet main pipe (4), and the water inlet main pipe (3) and the water outlet main pipe (4) are connected to the heat transfer pipe (5); The cross section of the heat transfer tube (5) is elliptical.

2. A heat exchanger for a nuclear power air conditioning unit according to claim 1, characterized in that: The heat exchanger is composed of a left frame (7), an upper frame (8), a right frame (9) and a lower frame (10) connected in pairs to form a heat exchanger frame. The frame is fixed by screws (13), and a fin (11) is provided in the middle of the frame.

3. A heat exchanger for a nuclear power air conditioning unit according to claim 2, characterized in that: The left frame (7) and the right frame (9) have four rows of openings, and the copper guard plate (12) passes through the openings and is arranged in the left frame (7) and the right frame (9); The heat transfer tube (5) passes through the two rows of openings on the outside of the left frame (7) and is connected to the water inlet main pipe (3) and the water outlet main pipe (4), and passes through the two rows of openings on the inside and is connected to the heat transfer tube elbow (6); The heat transfer tube (5) passes through the opening of the right frame (9) and is connected to the heat transfer tube elbow (6).

4. A heat exchanger for a nuclear power air conditioning unit according to claim 3, characterized in that: The heat transfer tubes (5) are arranged in a staggered manner, and the heat transfer tubes (5) are connected to the heat transfer tube bends (6) step by step downwards.

5. The heat exchanger for a nuclear power air conditioning unit according to claim 1, characterized in that: The elliptical major axis of the heat transfer tube (5) is 7.5 mm, and the minor axis is 7 mm.

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