A jet enthalpy-enhancing heat exchanger

Abstract

This invention provides a jet enthalpy-enhancing heat exchanger, comprising a heat exchange outer shell and a heat exchange inner shell. A heat exchange outer cavity for refrigerant flow is provided between the outer and inner shells. At least one hot water pipe is coiled around the heat exchange outer cavity. The heat exchange inner shell has a heat exchange inner cavity that communicates with the heat exchange outer cavity. A secondary subcooled liquid cavity is provided at the bottom of the outer cavity. The secondary subcooled liquid cavity contains an enthalpy-enhancing liquid pipe and a heat dissipation fixing plate. The enthalpy-enhancing liquid pipe is mounted on the heat dissipation fixing plate, forming a microchannel between the pipe and the plate for refrigerant enthalpy enhancement. The structure is simple, reducing the amount of enthalpy-enhancing liquid pipe used, increasing the heat exchange capacity for refrigerant enthalpy enhancement, effectively reducing the refrigerant resistance pressure drop within the enthalpy-enhancing liquid pipe, reducing operating noise, providing better heat dissipation, and ensuring product quality.

Description

Technical Field

[0001] This utility model relates to the technical field of heat exchangers, specifically a jet enthalpy-enhancing heat exchanger. Background Technology

[0002] With the continuous improvement of living standards, existing heat pump systems are widely used, utilizing the heat absorption and release phenomena generated by the liquid and gas phase changes of the refrigerant. For example, in the air conditioning cooling process, the refrigerant is drawn into the compressor and compressed, then releases heat and condenses into a liquid in the condenser. It then passes through a throttling device to reduce its pressure, and finally enters the heat exchanger to absorb heat and evaporate, returning to the compressor as vapor, thus realizing the refrigeration cycle and regulating the temperature of the medium or the surrounding environment. In the air conditioning heating process, the refrigerant is drawn into the compressor and compressed, then releases heat and condenses in the heat exchanger. It then passes through a throttling device to reduce its pressure, and finally enters the evaporator to absorb heat and evaporate into a gas, flowing back to the compressor.

[0003] However, under low outdoor temperatures, refrigerant evaporation is difficult, the compressor suction pressure is too low, the compressor power is reduced, resulting in insufficient compressor suction volume, poor heating effect of heat pump air conditioning units, and insufficient heating capacity.

[0004] To address this, existing units employ vapor injection enthalpy enhancement to increase heating capacity while ensuring the compressor remains operational. These units typically utilize vapor injection enthalpy enhancement heat exchangers. On one hand, they subcool the refrigerant in the main circulation loop before throttling, increasing the system's enthalpy difference and thus improving heating capacity. On the other hand, they appropriately preheat the low-pressure, low-temperature refrigerant in the auxiliary loop (where the refrigerant is introduced directly from the compressor's center and participates in compression) after pressure reduction via the expansion valve, achieving a suitable intermediate pressure. This preheated refrigerant vapor is then connected to the compressor's enthalpy enhancement port to supplement refrigerant vapor, providing secondary compression to increase the amount of circulating refrigerant for condenser heating and the compressor's discharge volume, thereby increasing heating capacity.

[0005] However, existing jet enthalpy-enhancing heat exchangers have the following shortcomings in practical applications:

[0006] 1) The existing jet enthalpy heat exchanger has excessively long jet enthalpy heat exchange tubes, resulting in a large pressure drop of the refrigerant inside the enthalpy heat exchange tubes.

[0007] 2) Existing jet enthalpy-enhancing heat exchangers use an immersion-type heat exchange method, which has weak convection and low heat exchange efficiency.

[0008] 3) Existing jet enthalpy-enhancing heat exchangers generate noise and have poor heat dissipation during operation. Summary of the Invention

[0009] The purpose of this invention is to address the shortcomings of existing technologies by proposing a jet enthalpy-enhancing heat exchanger.

[0010] The objective of this invention is achieved as follows: A jet enthalpy-enhancing heat exchanger includes a heat exchange outer shell and a heat exchange inner shell. A heat exchange outer cavity for refrigerant circulation is provided between the heat exchange outer shell and the heat exchange inner shell. At least one hot water pipe is coiled around the heat exchange outer cavity. The heat exchange inner shell is provided with a heat exchange inner cavity, which is connected to the heat exchange outer cavity. A secondary subcooled liquid cavity is provided at the bottom of the heat exchange outer cavity. The secondary subcooled liquid cavity is provided with an enthalpy-enhancing liquid pipe and a heat dissipation fixing plate. The enthalpy-enhancing liquid pipe is installed on the heat dissipation fixing plate and forms a microchannel for refrigerant enthalpy enhancement between the pipe and the plate.

[0011] Based on the above optimization, the heat exchange inner shell is provided with a contraction port, which is located at the bottom of the heat exchange inner cavity, so that a secondary subcooled liquid cavity is formed at the bottom of the heat exchange outer cavity.

[0012] Based on the above optimization, the heat exchange inner shell is provided with a through hole that is common to the heat exchange inner cavity, microchannel, secondary subcooled liquid cavity and heat exchange outer cavity. The through hole is located on the bottom of the heat exchange inner shell corresponding to the enthalpy-increasing liquid pipe.

[0013] Based on the above optimization, the heat dissipation fixing plates are respectively fixedly installed on the secondary subcooled liquid chamber, and there is an installation groove between the heat dissipation fixing plates to accommodate the fixed installation of the enthalpy-increasing liquid pipe.

[0014] Based on the above optimization, the enthalpy-increasing liquid pipe is coiled around the heat exchange inner shell on the mounting groove.

[0015] Based on the above optimization, the heat exchange shell is provided with a refrigerant inlet pipe and a refrigerant outlet pipe. The refrigerant inlet pipe is installed on the top of the heat exchange shell, and the inlet port of the refrigerant inlet pipe extends to the bottom of the heat exchange inner cavity. The refrigerant outlet pipe is installed on one side of the heat exchange shell and is connected to the heat exchange outer cavity.

[0016] Based on the above optimization, the heat exchange shell is provided with a heat exchange inlet pipe and a heat exchange outlet pipe. The heat exchange inlet pipe and the heat exchange outlet pipe are diagonally installed at the bottom and top of the heat exchange shell and are respectively connected to the inlet and outlet of the heat exchange water pipe.

[0017] Based on the above optimization, the heat exchange shell is provided with an enthalpy-increasing liquid inlet pipe and an enthalpy-increasing liquid outlet pipe. The enthalpy-increasing liquid inlet pipe and the enthalpy-increasing liquid outlet pipe are respectively fixed to the bottom of the heat exchange shell and connected to the liquid inlet and liquid outlet of the enthalpy-increasing liquid pipe.

[0018] Based on the above optimization, the enthalpy-increasing liquid pipe is set as an enthalpy-increasing aluminum liquid pipe, and the heat dissipation fixing plate is set as a fixing aluminum plate.

[0019] The advantages of this utility model are:

[0020] 1) The structure of enthalpy-increasing liquid pipe and heat dissipation fixing plate is adopted to reduce the amount of enthalpy-increasing liquid pipe used and form microchannels to improve the heat exchange of refrigerant enthalpy increase and effectively reduce the refrigerant resistance pressure drop in the enthalpy-increasing liquid pipe.

[0021] 2) By adding a heat dissipation fixing plate, the structure is simple, the enthalpy-increasing liquid pipe can be tightened, the noise during operation is reduced, and the heat dissipation fixing plate and the enthalpy-increasing liquid pipe provide better heat dissipation function due to their own characteristics.

[0022] 3) Due to the contraction opening of the heat exchange inner shell with this structure, the liquid heat exchange outer cavity is enlarged, stabilizing the refrigerant outlet temperature. Attached Figure Description

[0023] Appendix Figure 1 This is a schematic diagram of a preferred embodiment of the present invention.

[0024] Appendix Figure 2 This is a cross-sectional view of a preferred embodiment of the present invention. Detailed Implementation

[0025] The present invention will now be further described with reference to the accompanying drawings.

[0026] According to the appendix Figures 1 to 2 As shown, the jet enthalpy-enhancing heat exchanger of this utility model includes a heat exchange outer shell 1 and a heat exchange inner shell 2. A heat exchange outer cavity 11 for refrigerant circulation is provided between the heat exchange outer shell 1 and the heat exchange inner shell 2. At least one hot water pipe 3 is coiled around the heat exchange outer cavity 11. The heat exchange inner shell 2 is provided with a heat exchange inner cavity 21, which is connected to the heat exchange outer cavity 11. A secondary subcooled liquid cavity 12 is provided at the bottom of the heat exchange outer cavity 11. The secondary subcooled liquid cavity 12 is provided with an enthalpy-enhancing liquid pipe 4 and a heat dissipation fixing plate 5. The enthalpy-enhancing liquid pipe 4 is installed on the heat dissipation fixing plate 5 and forms a microchannel 6 between the pipe and the plate for refrigerant enthalpy enhancement.

[0027] Reference Figures 1 to 2 As shown in the diagram, further detailed, the heat exchange shell 1 is equipped with a refrigerant inlet pipe 13, a refrigerant outlet pipe 14, a heat exchange water inlet pipe 15, a heat exchange outlet pipe 16, an enthalpy-enhancing liquid inlet pipe 17, and an enthalpy-enhancing liquid outlet pipe 18. The refrigerant inlet pipe 13 is installed on the top of the heat exchange shell 1, and its inlet port extends to the bottom of the heat exchange inner cavity 21. The refrigerant outlet pipe 14 is installed on one side of the heat exchange shell 1 and communicates with the heat exchange outer cavity 11. The heat exchange water inlet pipe 15 and the heat exchange water outlet pipe 16 are diagonally mounted on the bottom and top of the heat exchange shell 1 and are respectively connected to the inlet and outlet of the heat exchange water pipe 3. The enthalpy-enhancing liquid inlet pipe 17 and the enthalpy-enhancing liquid outlet pipe 18 are respectively fixed to the bottom of the heat exchange shell 1 and communicate with the inlet and outlet of the enthalpy-enhancing liquid pipe 4.

[0028] The heat exchange inner shell 2 has a through hole 23 that is common to the heat exchange inner cavity 21, microchannel 6, secondary subcooled liquid cavity 12 and heat exchange outer cavity 11. The through hole 23 is located on the bottom of the heat exchange inner shell 2 corresponding to the enthalpy-increasing liquid pipe 4.

[0029] That is, high-temperature, high-pressure refrigerant superheated vapor enters the heat exchange inner cavity 21 from the compressor exhaust port through the heat exchange input pipe, and then enters the microchannel 6, the secondary subcooled liquid cavity 12, and the heat exchange outer cavity 11 through the through hole 23. In the heat exchange outer cavity 11, it condenses and releases heat to become liquid refrigerant. During this process, due to the setting of the microchannel 6, the heat exchange time is extended, and the water in the hot water exchange pipe 3 absorbs the heat released by the superheated vaporization and condensation of the refrigerant, becoming high-temperature hot water. This high-temperature hot water is output through the hot water exchange pipe 3 for user use, thus increasing the heat exchange capacity for refrigerant enthalpy increase. Next, the liquid refrigerant in the existing heat pump system is divided into two paths. One path is depressurized by a throttling device and flows to other heat exchangers in the unit to evaporate and absorb heat, becoming low-temperature, low-pressure refrigerant saturated vapor that flows back to the compressor. The other path is depressurized by another throttling device and flows to the enthalpy-increasing liquid pipe 4. The liquid refrigerant evaporates into refrigerant-saturated vapor by the heat of the liquid refrigerant in the microchannel 6 and the secondary subcooling liquid chamber 12 through the enthalpy-increasing liquid pipe 4. This allows the refrigerant in the microchannel 6 and the secondary subcooling liquid chamber 12 to be subcooled before throttling, increasing the system enthalpy difference, increasing the unit's heating capacity, and improving the heating effect. In addition, the low-pressure, low-temperature refrigerant in the enthalpy-increasing liquid pipe 4, after being depressurized by another throttling device, is properly preheated. The refrigerant saturated vapor is superheated before returning to the compressor to reach a suitable medium pressure, which is then provided to the compressor for secondary compression. Moreover, the refrigerant vapor is supplemented through the compressor's enthalpy-increasing port, thereby increasing the compressor's refrigerant discharge volume and increasing the circulating refrigerant volume in the hot water exchanger pipe 3 for heating, thus increasing the heating capacity.

[0030] Furthermore, the heat dissipation fixing plates 5 are respectively fixedly installed on the secondary subcooled liquid chamber 12, and there is an installation groove 7 between the heat dissipation fixing plates 5 for the fixed installation of the enthalpy-increasing liquid pipe 4; the enthalpy-increasing liquid pipe 4 is coiled around the heat exchange inner shell 2 in the installation groove 7. The structure is simple and reduces the amount of enthalpy-increasing liquid pipe 4 used, effectively reducing the refrigerant resistance pressure drop inside the enthalpy-increasing liquid pipe 4.

[0031] The enthalpy-increasing liquid pipe 4 is an enthalpy-increasing aluminum liquid pipe, and the heat dissipation fixing plate 5 is a fixing aluminum plate. In this way, the heat dissipation fixing plate 5 can secure the enthalpy-increasing liquid pipe 4, reduce noise during operation, and at the same time, due to the inherent characteristics of the heat dissipation fixing plate 5 and the enthalpy-increasing liquid pipe 4, provide better heat dissipation function.

[0032] In addition, the heat exchange inner shell 2 is provided with a contraction opening 22, which is located at the bottom of the heat exchange inner cavity 21, so that a secondary subcooled liquid cavity 12 is formed at the bottom of the heat exchange outer cavity 11. By adopting the contraction opening 22 of this structure, the liquid heat exchange outer cavity 11 is enlarged, and the refrigerant outlet temperature is stabilized.

[0033] The above specific embodiments are only specific implementations of the present invention with better effects. Any structure that is the same as or equivalent to the jet enthalpy-enhancing heat exchanger of the present invention is within the protection scope of the present invention.

Claims

1. A jet enthalpy-enhancing heat exchanger, comprising a heat exchange outer shell (1) and a heat exchange inner shell (2), wherein a heat exchange outer cavity (11) for refrigerant circulation is provided between the heat exchange outer shell (1) and the heat exchange inner shell (2), and at least one heat exchange water pipe (3) is coiled around the heat exchange outer cavity (11), characterized in that: The heat exchange inner shell (2) is provided with a heat exchange inner cavity (21), which is connected to the heat exchange outer cavity (11). The bottom of the heat exchange outer cavity (11) is provided with a secondary subcooled liquid cavity (12). The secondary subcooled liquid cavity (12) is provided with an enthalpy-increasing liquid pipe (4) and a heat dissipation fixing plate (5). The enthalpy-increasing liquid pipe (4) is installed on the heat dissipation fixing plate (5) and forms a microchannel (6) between it and the heat dissipation fixing plate (5) for increasing the enthalpy of the refrigerant.

2. The syngas superheating heat exchanger of claim 1, wherein: The heat exchange inner shell (2) is provided with a contraction opening (22), which is located at the bottom of the heat exchange inner cavity (21) so that a secondary subcooled liquid cavity (12) is formed at the bottom of the heat exchange outer cavity (11).

3. The syngas augmented heat exchanger of claim 1, wherein: The heat exchange inner shell (2) has a through hole (23) that is common to the heat exchange inner cavity (21), microchannel (6), secondary subcooled liquid cavity (12) and heat exchange outer cavity (11). The through hole (23) is located on the bottom of the heat exchange inner shell (2) corresponding to the enthalpy-increasing liquid pipe (4).

4. The syngas superheating heat exchanger of claim 1, wherein: The heat dissipation fixing plates (5) are respectively fixedly installed on the secondary subcooled liquid chamber (12), and there is an installation groove (7) between the heat dissipation fixing plates (5) to accommodate the fixed installation of the enthalpy-increasing liquid pipe (4).

5. The syngas superheating heat exchanger of claim 4, wherein: The enthalpy-increasing liquid pipe (4) is coiled around the heat exchange inner shell (2) on the mounting groove (7).

6. The syngas superheating heat exchanger of claim 1, wherein: The heat exchange shell (1) is provided with a refrigerant inlet pipe (13) and a refrigerant outlet pipe (14). The refrigerant inlet pipe (13) is installed on the top of the heat exchange shell (1), and the inlet port of the refrigerant inlet pipe (13) extends into the heat exchange shell (1) and to the bottom of the heat exchange inner cavity (21). The refrigerant outlet pipe (14) is installed on one side of the heat exchange shell (1), and the refrigerant outlet pipe (14) is connected to the heat exchange outer cavity (11).

7. The syngas superheating heat exchanger of claim 1, wherein: The heat exchange shell (1) is provided with a heat exchange inlet pipe (15) and a heat exchange outlet pipe (16). The heat exchange inlet pipe (15) and the heat exchange outlet pipe are diagonally assembled at the bottom and top of the heat exchange shell (1) and respectively connected to the inlet and outlet of the heat exchange water pipe (3).

8. The syngas superheating heat exchanger of claim 1, wherein: The heat exchange shell (1) is provided with an enthalpy-inlet pipe (17) and an enthalpy-outlet pipe (18). The enthalpy-inlet pipe (17) and the enthalpy-outlet pipe (18) are respectively fixed at the bottom of the heat exchange shell (1) and connected to the inlet and outlet of the enthalpy-inlet pipe (4).

9. The syngas superheating heat exchanger of claim 1, wherein: The enthalpy-increasing liquid pipe (4) is an enthalpy-increasing aluminum liquid pipe, and the heat dissipation fixing plate (5) is a fixing aluminum plate.

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