Simple double-pipe heat exchanger assembly

Abstract

The utility model discloses a simple double-pipe heat exchanger assembly which comprises a first double-pipe heat exchanger, a second double-pipe heat exchanger, a compressor and an expansion valve, and the first double-pipe heat exchanger and the second double-pipe heat exchanger are each composed of an outer pipe and an inner pipe arranged in the outer pipe. An outer pipe of the first double-pipe heat exchanger and an inner pipe of the second double-pipe heat exchanger are connected in parallel to form a refrigeration channel, and the compressor, the inner pipe of the first double-pipe heat exchanger, the expansion valve and the outer pipe of the second double-pipe heat exchanger are connected in series to form a mechanical refrigeration loop. Coolant is compressed through a compressor, the coolant is in a high-pressure state, when passing through an outer pipe of the second double-pipe heat exchanger, the coolant is cooled under the action of a refrigerant medium in an inner pipe of the second double-pipe heat exchanger, and the coolant is in a liquid state, is subjected to pressure reduction and cooling under the action of an expansion valve and is sprayed to an inner pipe of the first double-pipe heat exchanger. And an outer pipe refrigerant medium of the first double-pipe heat exchanger is subjected to heat dissipation and cooling.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat dissipation and heat pipes in a machine room, and particularly relates to a simple shell-and-tube heat exchanger component. Background Art

[0002] Now IDC computer rooms are using new technologies to improve the energy efficiency of cooling and hot standby, including fresh air energy-saving systems, heat exchange systems, and heat pipe heat exchanger energy saving. Among them, heat pipe technology has been maturely used in industries such as spacecraft, electronic equipment, and waste heat recovery. In the computer room air conditioning industry, gravity separation heat pipes (hereinafter referred to as "heat pipes") are mainly used. Heat pipe heat exchangers have a simple structure and no power components. They mainly exchange heat through the latent heat generated by the phase change of the refrigerant in the heat exchanger. They have high heat transfer efficiency and obvious energy-saving effects.

[0003] The integration density of cabinet servers in the computer room is getting higher and higher, and the heat generated by the servers is getting higher and higher. In order to ensure that the servers in the high heat density computer room work at the most suitable ambient temperature, the heat exchange method of the high heat density computer room is also constantly developing and changing. Now the application of heat pipe multi-split is becoming more and more widespread. There are currently two main forms of heat pipe multi-split. One is the pure gravity heat pipe multi-split system, which is mainly matched with the direct expansion system and switched in the transition season. The disadvantage of this system is that it requires the original computer room to be equipped with a direct expansion system, and it cannot be used independently throughout the year. The other is the direct expansion indirect gravity heat pipe multi-split system, which mainly integrates the direct expansion system and the gravity heat pipe system through the intermediate plate exchange. The advantage of this system is that it solves the problem that the pure gravity heat pipe multi-split system cannot be used independently throughout the year. The disadvantage is that the addition of the intermediate plate heat exchanger has more heat exchange components, occupies more space in the unit, and has a greater impact on the reliability of the system. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes a simple shell and tube heat exchanger assembly.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a simple shell and tube heat exchanger assembly, including a first shell and tube heat exchanger and a second shell and tube heat exchanger, the first shell and tube heat exchanger and the second shell and tube heat exchanger are both composed of an outer tube and an inner tube arranged in the outer tube, and the inner tube and the outer tube of the first shell and tube heat exchanger and the second shell and tube heat exchanger are respectively provided with a collecting pipe at both ends, and the collecting pipe is in a semicircular shape. The outer tube of the first shell and tube heat exchanger and the inner tube of the second shell and tube heat exchanger are connected in parallel to form a refrigeration channel for the circulation of a refrigerant medium. The first The inner tube of the shell and tube heat exchanger and the outer tube of the second shell and tube heat exchanger are connected in series to form a mechanical refrigeration circuit for coolant circulation. A compressor is provided between the inner tube outlet of the second shell and tube heat exchanger and the outer tube inlet of the first shell and tube heat exchanger, and an expansion valve is provided between the inner tube inlet of the first shell and tube heat exchanger and the outer tube outlet of the second shell and tube heat exchanger. The outer walls of the outer tubes of the first shell and tube heat exchanger and the second shell and tube heat exchanger are both provided with cooling fins. The flow direction of the refrigerant in the inner tube of the first shell and tube heat exchanger is opposite to the flow direction of the coolant in the outer tube of the first shell and tube heat exchanger.

[0006] Furthermore, a first solenoid valve is provided on the refrigeration channel, and the first solenoid valve is connected to the inner tube outlet of the second shell and tube heat exchanger.

[0007] Furthermore, the outlet of the inner tube of the second shell and tube heat exchanger is further provided with a bypass, the bypass is connected to the inlet of the refrigeration channel, and a second solenoid valve is provided on the bypass.

[0008] Furthermore, a third solenoid valve is provided between the compressor and the outer tube outlet of the second shell and tube heat exchanger.

[0009] Furthermore, fans are provided outside the first shell and tube heat exchanger and the second shell and tube heat exchanger. Beneficial Effects

[0010] In the mechanical refrigeration circuit of the utility model, the coolant is compressed by the compressor and becomes a high-pressure state. When passing through the outer tube of the second shell-and-tube heat exchanger, the coolant is cooled by the refrigerant medium in the inner tube of the second shell-and-tube heat exchanger. The coolant becomes liquid and is decompressed and cooled by the expansion valve. It is sprayed on the inner tube of the first shell-and-tube heat exchanger to dissipate heat and cool the refrigerant medium in the outer tube of the first shell-and-tube heat exchanger. Among them, the inner tube of the first shell-and-tube heat exchanger acts as an evaporator, and the outer tube of the second shell-and-tube heat exchanger acts as a condenser. Therefore, the shell-and-tube heat exchanger assembly does not need to add an evaporator and a condenser, reducing intermediate heat exchange components, and the entire air conditioning system is fully simplified, improving system reliability, and the structure is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1It is a structural schematic diagram of a simple shell and tube heat exchanger assembly of the utility model;

[0012] Figure 2 This is a schematic diagram of the structure of a pure heat pipe refrigeration channel involved in the utility model;

[0013] Figure 3 This is a schematic diagram of the structure of a mechanical refrigeration circuit involved in the utility model;

[0014] In the figure: 1. first shell and tube heat exchanger; 2. second shell and tube heat exchanger; 3. compressor; 4. expansion valve; 5. first solenoid valve; 6. second solenoid valve; 7. third solenoid valve; 8. collecting pipe; 9. refrigeration channel; 10. mechanical refrigeration circuit; 11. fan. DETAILED DESCRIPTION

[0015] 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 the embodiments. 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.

[0016] like Figure 1-3 A simple shell and tube heat exchanger assembly shown in the figure includes a first shell and tube heat exchanger 1 and a second shell and tube heat exchanger 2. The first shell and tube heat exchanger 1 and the second shell and tube heat exchanger 2 are both composed of an outer tube and an inner tube arranged in the outer tube. Both ends of the inner tube and the outer tube of the first shell and tube heat exchanger 1 and the second shell and tube heat exchanger 2 are respectively provided with a collecting pipe 8. The outer tube of the first shell and tube heat exchanger 1 and the inner tube of the second shell and tube heat exchanger 2 are connected in parallel to form a refrigeration channel 9 for the circulation of a refrigerant. The inner tube of the first shell and tube heat exchanger 1 and the outer tube of the second shell and tube heat exchanger 2 are connected in series to form a mechanical refrigeration circuit 10 for the circulation of a coolant. A compressor 3 is provided between the inner tube outlet of the second shell and tube heat exchanger 2 and the outer tube inlet of the first shell and tube heat exchanger 1. An expansion valve 4 is provided between the inner tube inlet of the first shell and tube heat exchanger 1 and the outer tube outlet of the second shell and tube heat exchanger 2. The outer walls of the outer tubes of the first shell and tube heat exchanger 1 and the second shell and tube heat exchanger 2 are both provided with heat dissipation fins.

[0017] The refrigeration channel 9 is provided with a first solenoid valve 5, which is connected to the inner tube outlet of the second shell-and-tube heat exchanger 2. The inner tube outlet of the second shell-and-tube heat exchanger 2 is also provided with a bypass, which is connected to the inlet of the refrigeration channel 9. The bypass is provided with a second solenoid valve 6. A third solenoid valve 7 is provided between the compressor 3 and the outer tube outlet of the second shell-and-tube heat exchanger 2. In actual use, the first solenoid valve 5, the second solenoid valve 6 and the third solenoid valve 7 are used to switch between different modes. It is suitable for cooling the indoor environment in different outdoor environments.

[0018] The collecting pipe 8 is in a semicircular shape. When the medium flows into and out of the shell and tube heat exchanger, a stable vortex is formed under the action of the collecting pipe 8, which will not directly flush the inner wall and bottom of the tube heat exchanger, thereby improving the stability and drainage efficiency of the airflow at the intersection.

[0019] The first shell and tube heat exchanger 1 and the second shell and tube heat exchanger 2 are arranged in a V shape, and a fan 11 is arranged on the top of the V-shaped heat exchanger assembly to dissipate the heat after heat exchange in the first time.

[0020] The flow direction of the refrigerant in the inner tube of the first double-tube heat exchanger 1 is opposite to the flow direction of the coolant in the outer tube of the first double-tube heat exchanger 1 .

[0021] Implementation Case 1:

[0022] When it is winter, the first solenoid valve 5 is opened, and the second solenoid valve 6 and the third solenoid valve 7 are closed. Figure 2 As shown, it operates in pure heat pipe cooling mode, and the compressor 3 and the expansion valve 4 are turned off at the same time. The inner tube of the first shell and tube heat exchanger 1 and the outer tube of the second shell and tube heat exchanger 2 are idle. The refrigerant in the multi-tube terminal is heated by heat exchange with the indoor hot air, and then sent to the outer tube of the first shell and tube heat exchanger 1 and the inner tube of the second shell and tube heat exchanger 2 through the outlet pipe. The heat is dissipated and cooled under the action of the heat dissipation fins and the fan 11. The refrigerant after heat dissipation and cooling returns to the multi-tube terminal through the return pipe, and continues to exchange heat with the indoor hot air, and the temperature in the machine room is reduced.

[0023] Implementation Case 2:

[0024] When it is in the transition season, the outdoor environment detection temperature is higher than the preset temperature value, the second solenoid valve 6 and the third solenoid valve 7 are opened, the first solenoid valve 1 is closed, and the operation is carried out in the compound cooling mode. After the refrigerant in the multi-connected terminal exchanges heat with the indoor hot air and heats up, it is sent to the outer tube of the first shell and tube heat exchanger 1 and the inner tube of the second shell and tube heat exchanger 2 through the outlet pipe. At the same time, the compressor 3 and the expansion valve 4 are opened. Figure 3 As shown, a mechanical refrigeration circuit for coolant circulation is formed by the compressor 3, the outer tube of the second double-tube heat exchanger 2, the expansion valve 4 and the inner tube of the first double-tube heat exchanger 1.

[0025] Among them, the compressor 3 is used to compress the coolant, and the coolant is put into a high-pressure gas state through compression, which is the basis for realizing a mechanical refrigeration circuit; the outer tube of the second shell and tube heat exchanger 2 is used to buffer the coolant, and the coolant is condensed by the refrigerant medium in the inner tube of the second shell and tube heat exchanger 2, the heat dissipation fins and the fan 11, so that the coolant state changes from a high-pressure gas state to a high-pressure liquid state; the expansion valve 4 is used to squeeze the coolant, so that the coolant changes rapidly from a high-pressure liquid state to a low-pressure gas state, and the temperature also drops rapidly at the same time; the inner tube of the first shell and tube heat exchanger 1 acts as an evaporator, which is used to cool and exchange heat with the refrigerant medium in the outer tube of the first shell and tube heat exchanger 1, and the heated coolant returns to the compressor 3, and the above steps are repeated.

[0026] The cooling medium passing through the inner tube of the second shell and tube heat exchanger 2 condenses the coolant in the outer tube of the second shell and tube heat exchanger 2. After heating, the refrigerant returns to the water outlet pipe through the third solenoid valve 7, mixes with the refrigerant discharged from the multi-connection end, and waits to re-enter the heat exchanger sleeve next time. The cooling medium passing through the inner tube of the first shell and tube heat exchanger 1 is cooled and dissipated under the action of the mechanical refrigeration circuit 10, the heat dissipation fins and the fan 11, and the cooled refrigerant returns to the multi-connection end through the reflux pipe.

[0027] The shell and tube heat exchanger assembly adopted by the utility model achieves the effect of one device serving two purposes, and solves the problem that the pure gravity heat pipe multi-split system cannot be used independently throughout the year. In the pure heat pipe refrigeration mode, heat is directly dissipated and cooled through the heat dissipation fins and the fan 11. In the compound refrigeration mode, a mechanical refrigeration circuit 10 is added, wherein the inner tube of the second shell and tube heat exchanger 2 acts as the condenser of the mechanical refrigeration circuit, and the outer tube of the first shell and tube heat exchanger 1 acts as the evaporator of the mechanical refrigeration circuit. There is no need to add a condenser and an evaporator, and the intermediate heat exchange components are reduced. The entire air-conditioning system is fully simplified, the system reliability is improved, and the structure is convenient.

[0028] It should be noted that the terms "part", "other", "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein.

[0029] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A simple shell and tube heat exchanger assembly, characterized in that: The invention comprises a first shell and tube heat exchanger (1) and a second shell and tube heat exchanger (2), wherein the first shell and tube heat exchanger (1) and the second shell and tube heat exchanger (2) are each composed of an outer tube and an inner tube arranged in the outer tube, and both ends of the inner tube and the outer tube of the first shell and tube heat exchanger (1) and the second shell and tube heat exchanger (2) are respectively provided with a collecting pipe (8), and the collecting pipe (8) is in the shape of a semicircular arc, and the outer tube of the first shell and tube heat exchanger (1) and the inner tube of the second shell and tube heat exchanger (2) are connected in parallel to form a refrigeration channel (9) for circulating a refrigerant medium, and the inner ... The outer tubes of the second shell-and-tube heat exchanger (2) are connected in series to form a mechanical refrigeration circuit (10) for coolant circulation. A compressor (3) is provided between the inner tube outlet of the second shell-and-tube heat exchanger and the outer tube inlet of the first shell-and-tube heat exchanger (1). An expansion valve (4) is provided between the inner tube inlet of the first shell-and-tube heat exchanger (1) and the outer tube outlet of the second shell-and-tube heat exchanger (2). The outer walls of the outer tubes of the first shell-and-tube heat exchanger (1) and the second shell-and-tube heat exchanger (2) are both provided with heat dissipation fins. The flow direction of the refrigerant in the inner tube of the first shell-and-tube heat exchanger (1) is opposite to the flow direction of the coolant in the outer tube of the first shell-and-tube heat exchanger (1).

2. The compact shell and tube heat exchanger assembly according to claim 1, characterized in that: The refrigeration channel (9) is provided with a first solenoid valve (5), and the first solenoid valve (5) is connected to the inner tube outlet of the second shell and tube heat exchanger (2).

3. The compact shell and tube heat exchanger assembly according to claim 1, characterized in that: The outlet of the second shell and tube heat exchanger (2) is also provided with a bypass, the bypass is connected to the inlet of the refrigeration channel, and a second solenoid valve (6) is provided on the bypass.

4. The compact shell and tube heat exchanger assembly according to claim 1, characterized in that: A third solenoid valve (7) is provided between the compressor (3) and the outer tube outlet of the second shell-and-tube heat exchanger (2).

5. The compact shell and tube heat exchanger assembly according to claim 1, characterized in that: A fan (11) is provided outside the first shell and tube heat exchanger (1) and the second shell and tube heat exchanger (2).

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