Low-resistance heat exchanger

Abstract

The utility model discloses a low-resistance heat exchanger which comprises a shell, a copper pipe is arranged in the shell, a water inlet and a water outlet are formed in the two sides of the shell, a Freon inlet and a Freon outlet are formed in the surface of the shell, the shell is of a barrel-shaped structure, flanges are arranged at the two ends of the shell, and the two ends of the shell are connected with the copper pipe. The two ends of the shell are provided with end sealing covers of hemispherical structures, the end sealing covers are connected with the shell through bolts and flanges, the ends of the end sealing covers are provided with a water inlet and a water outlet which are provided with flange structures respectively, the two ends of the interior of the shell are welded with copper pipe fixing plates, round holes are distributed in the copper pipe fixing plates, and the copper pipe fixing plates are provided with copper pipes. According to the utility model, the heat exchange area is further increased, the equipment resistance is further reduced, the resistance is smaller, the energy consumption is reduced, and the production cost and the operation cost are lower.

Description

Technical Field

[0001] The utility model belongs to the technical field of shell and tube heat exchangers, and particularly relates to a low-resistance heat exchanger. Background Art

[0002] Shell and tube heat exchangers are commonly used in evaporators and condensers of all air-conditioning chillers, cold (hot) water units (including Freon units, lithium bromide units), and industrial refrigeration (heat) equipment at home and abroad. Due to their unreasonable design, they have great water resistance, and the manufacturing and assembly process is relatively complicated. They need supply and return water partition plates to divide the cavity. The resistance of the water system under standard flow is generally 6-12m water column, which will inevitably cause the circulating water pump to require a higher water pump head to overcome the higher resistance to solve this problem, resulting in unnecessary waste of electricity. In addition, due to the higher power of the circulating water pump, the initial investment and the initial investment of the power distribution system supporting the water pump are increased accordingly.

[0003] In order to improve the energy saving level, a new type of low resistance heat exchanger is proposed. Utility Model Content

[0004] In order to solve the problem of excessive resistance in the prior art, the utility model provides a low-resistance heat exchanger with very small resistance, very low energy consumption and saved production and operation costs.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a low-resistance heat exchanger, comprising a shell, a copper tube is arranged in the shell, a water inlet and a water outlet are arranged on both sides of the shell, a Freon inlet and a Freon outlet are arranged on the surface of the shell, and flange structures are arranged at the ends of the Freon inlet and the Freon outlet. The shell is a cylindrical structure, flanges are arranged at both ends of the shell, and end covers with hemispherical structures are arranged at both ends of the shell. The end covers are connected to the shell through bolts and flanges, and the ends of the end covers are respectively provided with a water inlet and a water outlet with flange structures, and copper tube fixing plates are welded at both ends of the shell, circular holes are distributed on the copper tube fixing plates, and copper tube bundles arranged in parallel are arranged in the circular holes.

[0006] Compared with the prior art, the beneficial effects of the utility model are:

[0007] The heat exchange area is further increased, the equipment resistance is further reduced, the resistance is very small, the energy consumption is very low, and the production and operation cost is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the structure of the utility model.

[0009] Figure 2 This is a schematic diagram of the structure of the copper tube fixing plate of the utility model.

[0010] Figure 3This is a schematic diagram of the copper tube fixing plate structure of a conventional heat exchanger of the utility model.

[0011] Figure 4 This is a schematic diagram of the water flow direction structure of the utility model.

[0012] Figure 5 This is a schematic diagram of the water flow direction structure of a traditional heat exchanger of the utility model.

[0013] In the figure: 1 shell, 2 end cover, 3 Freon inlet, 4 Freon outlet, 5 copper tube fixing plate, 6 copper tube bundle, 7 water inlet, 8 water outlet, 9 round hole. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0015] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention. Example

[0016] See attached Figure 1-5 As shown, a low resistance heat exchanger comprises a shell 1, wherein a copper tube (tube bundle) 6 is arranged in the shell 1, a water inlet 7 and a water outlet 8 are arranged on both sides of the shell 1, a Freon inlet 3 and a Freon outlet 4 are arranged on the surface of the shell 1, and flange structures are arranged at the ends of the Freon inlet 3 and the Freon outlet 4, the shell 1 is a cylindrical structure, flanges are arranged at both ends of the shell 1, and end covers 2 of a hemispherical structure are arranged at both ends of the shell 1, flanges are welded on the end covers 2 and connected to the shell 1 through bolts and flanges, and water inlets 7 and water outlets 8 with flange structures are respectively arranged at the ends of the end covers 2, copper tube fixing plates 5 are welded at both ends of the shell 1, circular holes are distributed on the copper tube fixing plates 5, and copper tube bundles 6 arranged in parallel are arranged in the circular holes.

[0017] Working principle: The circular holes 9 arranged on the copper tube fixing plate 5 correspond to each other up and down and are evenly distributed. The spacing between the small holes is the same, and they are positioned and connected with the copper tube bundle 6. The copper tube and the copper tube fixing plate 5 are connected by tube expansion technology and metal sealant. The water inlet 7 and the water outlet 8 are respectively arranged on both sides of the shell, so that the water flow in the copper tube bundle 6 is all connected in parallel, and the copper tubes on the copper tube bundle can be increased by 1-3 rows, so that the number of copper tubes running in parallel is further increased, and the equipment resistance is further reduced.

[0018] Example description:

[0019] Using a traditional heat exchanger, for example, a condenser with a design flow of 200m³ / h and a total water resistance of 8m water column, it can be roughly considered that the resistance from the water inlet to the right end cap is about 4m water column from left to right, and 4m water column from right to left. When the water is changed to the opposite side inlet and outlet, the upper and lower groups of copper tube bundles (two groups of copper tube bundles with equal numbers are connected in parallel, and then the two groups are operated in series) are all changed to parallel operation. The upper copper tube shares half of the total flow, 100m³ / h, and the lower copper tube bundle shares half of the total flow, 100m³ / h. The total flow is still 200m³ / h, but the flow in the upper and lower tube bundles is reduced by half. According to the relationship between flow and resistance.

[0020] △P∝G²;

[0021] ∵Energy consumed per unit time (i.e., electrical power consumed) P∝△P*G²);

[0022] ∴P∝G³;

[0023] Where: △P is the resistance (equipment resistance is the inlet and outlet pressure difference);

[0024] G is the water flow rate;

[0025] P is the electrical power.

[0026] After calculation, when the lower water inlet flow rate is reduced by half (1 / 2), the flow rate of the lower water from left to right becomes 100m³ / h, and the total resistance is only 1 / 4 of the original, that is, △P=1m / water column, that is, the total resistance of the equipment from left to right (from right to left without return) is only 1m water column, which is equivalent to 1 / 8 of the original total resistance of 8m. Considering that the traditional design of water inlet and outlet is divided by partitions, which affects the number of copper tubes, after the improved design without partitions, the number of copper tubes is further increased by 1-3 rows, which further shares the total flow and increases the heat exchange area, so the equipment resistance will be less than 1m water column, that is, less than 1 / 8 of the original total resistance of 8m water column;

[0027] ∵ P∝△P*G², when the total flow rate remains unchanged and the total resistance is reduced to 1 / 8 of the original, the power consumption of water flowing through the heat exchanger is also reduced to less than 1 / 8 of the original.

[0028] contrast Figure 2 , Figure 3 The utility model increases the number of copper tube rows and the number of copper tubes.

[0029] contrast Figure 4 , Figure 5 All the copper tubes of the utility model are changed from being connected in parallel in two groups and then in series in two groups to being connected in parallel.

[0030] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the utility model, and any figure marks in the claims should not be regarded as limiting the claims involved.

[0031] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A low resistance heat exchanger, comprising a shell, a copper tube is arranged in the shell, a water inlet and a water outlet are arranged on both sides of the shell, and a Freon inlet and a Freon outlet are arranged on the surface of the shell, characterized in that: The shell is a cylindrical structure, with flanges at both ends of the shell, and end covers with hemispherical structures at both ends of the shell. The end covers are connected to the shell through bolts and flanges, and the ends of the end covers are respectively provided with water inlets and water outlets with flange structures. Copper tube fixing plates are welded at both ends of the shell, and circular holes are distributed on the copper tube fixing plates. Copper tube bundle expansion tubes arranged in parallel are fixed in the circular holes.

2. A low resistance heat exchanger according to claim 1, characterized in that: The Freon inlet and the Freon outlet ends are provided with flange structures.

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