A central refrigeration air conditioner heat exchanger tube plate expansion joint structure

Abstract

This utility model discloses a tube sheet expansion joint structure for a central refrigeration and air conditioning heat exchanger, including a tube sheet body. The tube sheet body has a through hole for inserting heat exchange tubes. Two expansion grooves and several continuously arranged sealing grooves are sequentially formed along the axial direction around the through hole on the inner wall of the through hole. The two expansion grooves include expansion groove one and expansion groove two. Expansion groove one is located on the tube side of the tube sheet, and the sealing grooves are located on the shell side of the tube sheet. This utility model uses a combination of expansion grooves and sealing grooves to ensure the tensile strength and sealing performance of the joint between the non-ferrous metal heat exchange tubes and the tube sheet in the central refrigeration and air conditioning heat exchanger.

Description

Technical Field

[0001] This utility model relates to central refrigeration air conditioning, and more particularly to a tube sheet expansion joint structure for a central refrigeration air conditioning heat exchanger. Background Technology

[0002] Non-ferrous metal heat exchangers are generally used in highly corrosive environments, where the tube-side medium is a corrosive fluid, thus requiring highly corrosion-resistant materials. The shell-side medium, however, is typically the heat exchange fluid, and is often made of ordinary stainless steel or even carbon steel. If a leak occurs at the tube-to-tubesheet joint, the tube-side medium can flow into the shell, contaminating not only the production materials but also corroding the shell and related equipment, potentially causing production accidents. Therefore, it is crucial to strictly ensure the connection quality between the non-ferrous metal heat exchanger tubes and the tubesheet.

[0003] Ensuring a reliable connection between non-ferrous metal heat exchanger tubes and the tube sheet is challenging. The significant difference in linear expansion coefficients between the two materials can lead to a decrease in the tensile strength of the joint as temperature rises. Ordinary heat exchanger expansion joint structures are unsuitable for non-ferrous metal heat exchangers and fail to meet the sealing requirements of central refrigeration and air conditioning heat exchangers.

[0004] Therefore, it is necessary to develop a new type of tube sheet expansion joint structure for central refrigeration and air conditioning heat exchangers to overcome the above problems. Utility Model Content

[0005] Purpose of the utility model: In view of the shortcomings and defects of the existing technology, this utility model provides a tube sheet expansion joint structure for a central refrigeration and air conditioning heat exchanger, which combines expansion joint groove and sealing groove to ensure the tensile strength and sealing performance of the non-ferrous metal heat exchange tube and tube sheet joint of the central refrigeration and air conditioning heat exchanger.

[0006] Technical solution: The present invention relates to a tube sheet expansion joint structure for a central refrigeration and air conditioning heat exchanger, characterized in that: it includes a tube sheet body, on which a through hole for inserting heat exchange tubes is provided, and on the inner wall of the through hole, two expansion joint grooves and several continuously arranged sealing grooves are sequentially formed around the through hole along the axial direction; the two expansion joint grooves include expansion joint groove one and expansion joint groove two, expansion joint groove one being located on the tube side of the tube sheet, and sealing grooves being located on the shell side of the tube sheet.

[0007] Among them, the expansion groove one and expansion groove two are rectangular grooves with a width of 6mm and a depth of 0.5mm.

[0008] The distance between the expansion joint groove and the surface of the tube sheet body on the tube side is 10mm.

[0009] The spacing between adjacent expansion grooves one and two is 8 mm.

[0010] The sealing groove is a V-shaped groove with a 90° angle at the tip and a depth of 0.5 mm.

[0011] The tube sheet body is a central refrigeration air conditioning heat exchanger tube sheet.

[0012] The heat exchange tube is in contact with the rubber bag, and the rubber bag is connected to the high-pressure liquid pipe of the expansion rod core, so that the expansion pressure of the high-pressure liquid is applied to the rubber bag.

[0013] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: The present invention adopts a combination of expansion groove and sealing groove to ensure the tensile strength and sealing performance of the non-ferrous metal heat exchange tube and tube sheet joint of the central refrigeration air conditioning heat exchanger, and is suitable for non-ferrous metal heat exchangers. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a structural diagram of the expansion joint structure and the expansion joint of the heat exchange tube of this utility model;

[0016] In the figure, 1 is a through hole; 2 is expansion groove one; 3 is the tube sheet body; 4 is expansion groove two; 5 is a sealing groove; 6 is a heat exchange tube; 7 is an expansion rod core; 8 is a high-pressure liquid tube; and 9 is a rubber bag. Detailed Implementation

[0017] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0018] The present invention relates to a tube sheet expansion structure for a central refrigeration air conditioner heat exchanger, comprising a tube sheet body 3, wherein a through hole 1 is provided on the tube sheet body 3 for inserting heat exchange tubes 6, and two expansion grooves and several continuously arranged sealing grooves 5 are sequentially formed along the axial direction around the through hole 1 on the inner wall of the through hole 1; the two expansion grooves include expansion groove one 2 and expansion groove two 4, with expansion groove one 2 located on the tube side of the tube sheet (…). Figure 1 (A side), sealing groove 5 is located on the shell side of the tube sheet ( Figure 1 (Middle B side). Expansion groove 1 (2) and expansion groove 2 (4) are rectangular grooves, 6mm wide and 0.5mm deep. The distance between expansion groove 1 (2) and the surface of the tube sheet body 3 on the tube-side side is 10mm. The distance between adjacent expansion grooves 1 (2) and 2 (4) is 8mm. The sealing groove 5 is a V-shaped groove with a 90° angle and a depth of 0.5mm. The tube sheet body 3 is the tube sheet of a central refrigeration air conditioning heat exchanger. The heat exchange tube 6 contacts the rubber bag 9, which is connected to the high-pressure liquid pipe 8 of the expansion rod core 7, applying the expansion pressure of the high-pressure liquid to the rubber bag 9.

[0019] During use, high-pressure liquid is applied evenly to the rubber bag 9 through the center hole of the expansion rod 7. The rubber bag 9 squeezes the heat exchange tube 6, causing the heat exchange tube 6 to undergo plastic deformation. At this time, the tube sheet body 3 is still within the elastic deformation range. After the expansion pressure is unloaded, the heat exchange tube 6 and the tube sheet body 3 form an interference fit, and a tight connection is achieved by relying on the residual stress between the two.

[0020] This utility model combines expansion grooves and sealing grooves to ensure the tensile strength and sealing performance of the non-ferrous metal heat exchange tubes and tube sheet joints in central refrigeration and air conditioning heat exchangers, making it suitable for non-ferrous metal heat exchangers.

Claims

1. A tube sheet expansion joint structure for a central refrigeration air conditioning heat exchanger, characterized in that: The tube sheet body (3) is provided with a through hole (1) for inserting heat exchange tubes (6). Two expansion grooves and several sealing grooves arranged in a continuous manner are provided on the inner wall of the through hole (1) around the through hole (1) along the axial direction. The two expansion grooves include expansion groove one (2) and expansion groove two (4). Expansion groove one (2) is located on the tube side of the tube sheet, and sealing groove (5) is located on the shell side of the tube sheet.

2. The tube sheet expansion joint structure of the central refrigeration and air conditioning heat exchanger according to claim 1, characterized in that: The expansion joint groove 1 (2) and expansion joint groove 2 (4) are rectangular grooves with a width of 6mm and a depth of 0.5mm.

3. The expansion joint structure of the central refrigeration and air conditioning heat exchanger tube sheet according to claim 1, characterized in that: The distance between the expansion joint groove (2) and the surface of the tube sheet body (3) on the tube sheet side is 10 mm.

4. The tube sheet expansion joint structure of the central refrigeration and air conditioning heat exchanger according to claim 3, characterized in that: The spacing between adjacent expansion joint grooves 1 (2) and 2 (4) is 8 mm.

5. The expansion joint structure of the central refrigeration air conditioning heat exchanger tube sheet according to claim 1, characterized in that: The sealing groove (5) is a V-shaped groove with a 90° angle at the tip and a groove depth of 0.5 mm.

6. The tube sheet expansion joint structure of the central refrigeration and air conditioning heat exchanger according to claim 1, characterized in that: The tube sheet body (3) is a central refrigeration air conditioning heat exchanger tube sheet.

7. The expansion joint structure of the central refrigeration and air conditioning heat exchanger tube sheet according to claim 1, characterized in that: The heat exchange tube (6) is in contact with the rubber bag (9), and the rubber bag (9) is connected to the high-pressure liquid pipe (8) of the expansion rod core (7), so that the expansion pressure of the high-pressure liquid is applied to the rubber bag (9).

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