Double-pipe heat exchanger

Abstract

The utility model relates to the technical field of heat exchangers, in particular to a double-pipe heat exchanger. The electric heating device comprises an annular electric heating inner plate, a heat preservation arc plate arranged on the outer side of the annular electric heating inner plate in a sliding mode and a heat exchange coil pipe arranged between the annular electric heating inner plate and the heat preservation arc plate and spirally surrounding the outer circumferential wall of the annular electric heating inner plate. A first heating plate is fixedly arranged on the peripheral wall of the electric heating inner plate; a plurality of second heating plates are arranged on the inner side face of the heat preservation arc plate in parallel at intervals. A mounting cavity is formed in the heat preservation arc plate, a vacuum motor is fixedly arranged at the top in the mounting cavity, and a sewage tank communicating with the vacuum motor is fixedly arranged at the bottom of the mounting cavity; and a plurality of water absorption holes are formed between the adjacent first heating plates on the inner side wall of the mounting cavity. The utility model aims to provide a double-pipe heat exchanger, which solves the problems that water drops are easy to freeze again in cold weather, the anti-freezing measure is single and the effect is limited because the existing anti-freezing measure cannot process the water drops after the outer wall of a heat exchange coil pipe is defrosted in time.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to a shell and tube heat exchanger. Background Art

[0002] A heat exchanger is a common heat exchange equipment. It is an energy-saving equipment used to transfer heat between two or more fluids at different temperatures. It transfers heat from a higher-temperature fluid to a lower-temperature fluid so that the fluid temperature reaches the specified indicators of the process to meet the needs of process conditions. It is also one of the main equipment for improving energy utilization. It plays an important role in refrigeration, chemical, petroleum, power, food and many other industrial production. It should be noted that due to the low temperature in cold areas in winter and the reduced water flow rate in the heat exchanger coil, the surface and inside of the heat exchanger are very likely to freeze, causing the water pipe to rupture and cause damage to the user.

[0003] Existing antifreeze measures for heat exchange coil pipes mainly include the following: 1. Wrap the heat exchange coil pipes with insulation materials; 2. Insulate with electric heaters by winding heating tape around the heat exchange coil pipes, monitoring the inlet water temperature, and starting the heating tape to surround the heat exchange coil pipes.

[0004] After the above-mentioned anti-freeze measures use electric heaters to heat the outside of the heat exchange coil pipe, the thermal insulation effect of the heating tape is limited. When it passes through the outside of the heat exchange coil pipe, part of the ice layer outside the heat exchange coil thaws and the ice water flows downward. It is very likely that the water droplets will not drip onto the ground and will freeze again, or the water droplets will drip and accumulate in the gaps between adjacent pipes.

[0005] Therefore, how to design a shell and tube heat exchanger that can solve the above technical problems is a technical problem that needs to be solved. Utility Model Content

[0006] In order to solve the above problems, the purpose of the present invention is to provide a shell and tube heat exchanger, which solves the problem that the existing antifreeze measures cannot promptly deal with the water droplets on the outer wall of the heat exchange coil after thawing, resulting in the water droplets easily freezing again in cold weather, and the antifreeze measures are single and have limited effects.

[0007] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: it comprises an annular electric heating inner plate, an insulation arc plate slidably arranged on the outer side of the annular electric heating inner plate, and a heat exchange coil arranged between the annular electric heating inner plate and the insulation arc plate and spirally surrounding the outer peripheral wall of the annular electric heating inner plate; a first heating plate is fixedly provided on the outer peripheral wall of the annular electric heating inner plate, and two groups of transmission assemblies are provided in parallel along the circumference of the upper and lower sides of the outer peripheral wall of the annular electric heating inner plate; the upper and lower ends of the insulation arc plate are respectively mounted on the two groups of transmission assemblies; the inner side surface of the insulation arc plate is in contact with the outer side surface of the heat exchange coil, and a plurality of second heating plates are provided in parallel and spaced apart on the inner side surface of the insulation arc plate; an installation cavity is opened in the insulation arc plate, a vacuum motor is fixed on the top of the installation cavity, and a sewage tank connected to the vacuum motor is fixed on the bottom of the installation cavity; a plurality of water suction holes are opened between adjacent first heating plates on the inner side wall of the installation cavity, and a plurality of water inlet pipes are provided between the water suction holes and the sewage tank.

[0008] Furthermore, both groups of transmission components are linear modules.

[0009] Furthermore, a liquid level detector is provided on the inner wall of the sewage tank.

[0010] Furthermore, a ventilation hole is provided on the heat-insulating arc plate at a position corresponding to the vacuum motor.

[0011] Furthermore, a sewage outlet connected to the sewage tank is provided at a position on the bottom of the heat-insulating arc plate corresponding to the sewage tank, and the sewage outlet is detachably connected to a sealing cover.

[0012] Furthermore, the heat-insulating arc plate and the annular electric heating inner plate are respectively housed in a temperature controller electrically connected to the second heating plate and the first heating plate.

[0013] The utility model has the following beneficial effects:

[0014] 1. The utility model provides an annular electric heating inner plate, a first heating plate, an insulation arc plate, and a second heating plate to continuously heat and insulate the inside and outside of the heat exchange coil, thereby preventing the water flow in the heat exchange coil from freezing. At the same time, it prevents the outer wall of the heat exchange coil from rupturing due to the external temperature being too low or the frozen volume of the internal water flow increasing and breaking the outer wall. The structure is stable and effectively provides anti-freeze protection.

[0015] 2. The utility model sets a vacuum motor, a sewage tank and a water absorption hole in the heat-insulating arc plate, and generates a high-speed airflow through the vacuum motor to quickly absorb the water droplets after the ice layer on the outer wall of the heat exchange coil melts. On the one hand, it speeds up the air flow and increases the thawing speed of the ice layer. On the other hand, it quickly absorbs the water droplets, preventing the water droplets from sliding down slowly or accumulating between adjacent heat exchange coils and freezing again to form an ice layer, thereby improving the anti-freeze protection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a partial cross-sectional schematic diagram of the utility model.

[0017] Description of reference numerals:

[0018] 1- annular electric heating inner plate, 11- first heating plate, 12- transmission assembly;

[0019] 2-insulation arc plate, 21-second heating plate, 22-installation cavity, 23-vacuum motor, 24-sewage tank, 241-liquid level detector, 25-water suction hole, 26-water inlet pipe, 27-ventilation hole, 28-sewage outlet, 281-sealing cover;

[0020] 3-Heat exchange coil. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0022] See also Figure 1 As shown, the scheme includes an annular electric heating inner plate 1, an insulation arc plate 2 slidingly arranged on the outside of the annular electric heating inner plate 1, and a heat exchange coil 3 arranged between the annular electric heating inner plate 1 and the insulation arc plate 2 and spirally arranged around the outer peripheral wall of the annular electric heating inner plate 1;

[0023] A first heating plate 11 is fixedly mounted on the outer circumferential wall of the annular electric heating inner plate 1. Two sets of transmission assemblies 12 are parallelly mounted on the upper and lower sides of the outer circumferential wall of the annular electric heating inner plate 1 along its circumferential direction. The upper and lower ends of the insulation arc plate 2 are respectively mounted on the two sets of transmission assemblies 12. The inner side surface of the insulation arc plate 2 is in contact with the outer side surface of the heat exchange coil 3, and a plurality of second heating plates 21 are parallelly and spaced apart on the inner side surface of the insulation arc plate 2. An installation cavity 22 is defined within the insulation arc plate 2. A vacuum motor 23 is fixedly mounted at the top of the installation cavity 22, and a sewage tank 24 connected to the vacuum motor 23 is fixedly mounted at the bottom of the installation cavity 22. A plurality of water suction holes 25 are defined between adjacent first heating plates on the inner side wall of the installation cavity 22. A plurality of water inlet pipes 26 are connected between the plurality of water suction holes 25 and the sewage tank 24. The aforementioned vacuum motor 23 is prior art and will not be further elaborated.

[0024] Furthermore, both sets of transmission components 12 are linear modules.

[0025] Furthermore, in order to prevent the sewage tank 24 from overflowing, a liquid level detector is provided on the inner wall of the sewage tank 24 in this embodiment.

[0026] Furthermore, a ventilation hole 27 is provided on the heat-insulating arc plate 2 at a position corresponding to the vacuum motor 23 to facilitate the use of the vacuum motor 23 .

[0027] In order to facilitate drainage, in this embodiment, a sewage outlet 28 connected to the sewage tank 24 is opened at a position corresponding to the sewage tank 24 at the bottom of the insulation arc plate 2, and the sewage outlet 28 is detachably connected to a sealing cover 281.

[0028] The insulation arc plate 2 and the annular electric heating inner plate 1 are respectively connected to the second heating plate 21 and the first heating plate 11 by temperature controllers, and the insulation arc plate 2 and the annular electric heating inner plate 1 are provided with power supplies for them; the temperature controller outputs corresponding control signals to control the first heating plate 11 and the second heating plate 21 to generate heat, and maintain the temperature within the set range to achieve anti-freeze protection.

[0029] The working principle is roughly as follows:

[0030] When the outside temperature affects the heat exchange coil 3 and causes the temperature of the outer wall of the heat exchange coil 3 to drop, the first heating plate 11 and the second heating plate 21 are started by the temperature controller to generate heat, and the heat exchange coil 3 is continuously heated and insulated. The inner side surface of the insulation arc plate 2 fits with the outer side surface of the heat exchange coil 3. At this time, the insulation arc plate 2 moves along the transmission assembly 12 around the annular electric heating inner plate 1. During the movement, when the vacuum motor 23 in the insulation arc plate 2 works to generate high-speed airflow, a vacuum state is formed in the sewage tank 24. The ice layer on the outer wall of the heat exchange coil 3 is dissolved into water droplets under the heating action of the second heating plate 21 and the first heating plate 11. The water droplets that slide down or accumulate between adjacent heat exchange coils 3 are affected by the high-speed airflow and enter the sewage tank 24 through the water suction hole 25 and the water inlet pipe 26.

[0031] The above description is only a specific embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, is also included in the patent protection scope of the present invention.

Claims

1. A double-tube heat exchanger, characterized in that: It comprises an annular electric heating inner plate (1), a heat-insulating arc plate (2) slidably arranged on the outside of the annular electric heating inner plate (1), and a heat exchange coil (3) arranged between the annular electric heating inner plate (1) and the heat-insulating arc plate (2) and spirally arranged around the outer peripheral wall of the annular electric heating inner plate (1); A first heating plate (11) is fixedly provided on the outer peripheral wall of the annular electric heating inner plate (1), and two groups of transmission components (12) are provided in parallel along the circumference of the upper and lower sides of the outer peripheral wall of the annular electric heating inner plate (1), and the upper and lower ends of the insulation arc plate (2) are respectively installed on the two groups of the transmission components (12); the inner side surface of the insulation arc plate (2) is in contact with the outer side surface of the heat exchange coil (3), and a plurality of second heating plates (21) are provided in parallel and spaced apart on the inner side surface of the insulation arc plate (2); an installation cavity (22) is provided in the insulation arc plate (2), a vacuum motor (23) is fixedly provided on the top of the installation cavity (22), and a sewage tank (24) connected to the vacuum motor (23) is fixedly provided at the bottom of the installation cavity (22); a plurality of water absorption holes (25) are provided between the inner side wall of the installation cavity (22) and the adjacent first heating plates, and a plurality of water inlet pipes (26) are provided between the plurality of water absorption holes (25) and the sewage tank (24).

2. The double-tube heat exchanger according to claim 1, characterized in that: Both sets of transmission components (12) are linear modules.

3. The double-tube heat exchanger according to claim 1, characterized in that: The inner wall of the sewage tank (24) is provided with a liquid level detector (241).

4. The double-tube heat exchanger according to claim 1, characterized in that: A ventilation hole (27) is provided on the heat-insulating arc plate (2) at a position corresponding to the vacuum motor (23).

5. The double-tube heat exchanger according to claim 1, characterized in that: A sewage outlet (28) connected to the sewage tank (24) is provided at a position on the bottom of the heat-insulating arc plate (2) corresponding to the sewage tank (24), and the sewage outlet (28) is detachably connected to a sealing cover (281).

6. The double-tube heat exchanger according to claim 1, characterized in that: The heat-insulating arc plate (2) and the annular electric heating inner plate (1) are both respectively connected to the temperature controllers of the second heating plate (21) and the first heating plate (11).

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