Phase change heat exchanger and heat pump system

Abstract

The utility model relates to a phase change heat exchanger and a heat pump system. The phase change heat exchanger comprises a shell, a first heat exchange pipe and a second heat exchange pipe. The shell is provided with a cavity, the cavity comprises a top chamber and a bottom chamber which are distributed in the vertical direction, the top chamber is communicated with the bottom chamber, and the bottom chamber is used for containing a liquid medium; the first heat exchange pipe is arranged in the bottom cavity, the first heat exchange pipe is used for conveying a heat exchange medium for heating the liquid medium, the first heat exchange pipe is used for heating the liquid medium to generate a gaseous medium, and the top cavity is filled with the gaseous medium; the second heat exchange pipe is arranged in the top cavity, the first heat exchange pipe and the second heat exchange pipe are arranged at intervals in the vertical direction, when the bottom cavity contains the liquid medium, the second heat exchange pipe is used for conveying the medium to be heated, and the gaseous medium heats the medium to be heated and is condensed into the liquid medium. The phase change heat exchanger is simple in structure, small in occupied area, low in cost and high in operation efficiency.

Description

Technical Field

[0001] The present application belongs to the field of refrigeration and heat pump technology, and in particular, relates to a phase change heat exchanger and a heat pump system. Background Art

[0002] At present, heat pump technology is increasingly used in various fields due to its advantages such as high energy efficiency, zero pollutant emissions, and intelligence.

[0003] The application of heat pumps has involved fields such as food biology and medicine, urban utilities, and the cultivation and processing of agricultural and sideline products. In the application of related technologies, issues such as food safety and circulating medium corrosion are involved. The heat exchanger in the heat pump system cannot perform direct heat exchange, but an indirect heat exchange system is used for heating. The indirect heat exchange system includes a medium circulation pipeline and a water pump. The medium circulation pipeline and the water pump are used to transport the intermediate circulation medium. The water pump allows the intermediate circulation medium to absorb heat on one side of the heat pump and release heat on the heat user side. However, since the indirect heat exchange system includes additional medium circulation pipelines and water pumps, the overall system structure is more complicated, the floor space is increased, the overall system operation efficiency is reduced, and the cost of the heat pump system increases. Utility Model Content

[0004] The embodiments of the present application provide a phase change heat exchanger and a heat pump system. The phase change heat exchanger has a simple structure, occupies a small area, has low cost and high operating efficiency.

[0005] In one aspect, an embodiment of the present application provides a phase change heat exchanger, comprising:

[0006] The housing is provided with a cavity, the cavity includes a top cavity and a bottom cavity distributed in a vertical direction, the top cavity and the bottom cavity are connected, and the bottom cavity is used to contain a liquid medium;

[0007] A first heat exchange tube is disposed in the bottom chamber, the first heat exchange tube is used to transport a heat exchange medium for heating a liquid medium, the first heat exchange tube is used to heat the liquid medium to generate a gaseous medium, and the gaseous medium fills the top chamber;

[0008] The second heat exchange tube is arranged in the top chamber. The first heat exchange tube and the second heat exchange tube are arranged at intervals in the vertical direction. When the bottom chamber contains liquid medium, the second heat exchange tube is used to transport the medium to be heated. The gaseous medium heats the medium to be heated and condenses to form a liquid medium.

[0009] In some embodiments, the first heat exchange tube includes a first horizontal section, a first bending section and a second horizontal section. The first horizontal section and the second horizontal section are respectively connected to two ends of the first bending section. Along the vertical direction, the first horizontal section and the second horizontal section are spaced apart. The first horizontal section has a heat exchange medium input port, and the second horizontal section has a heat exchange medium output port.

[0010] In some embodiments, the second heat exchange tube includes a third horizontal section, a second bending section and a fourth horizontal section. The third horizontal section and the fourth horizontal section are connected to both ends of the second bending section. The third horizontal section and the fourth horizontal section are spaced apart in the vertical direction. The third horizontal section has an input port for the medium to be heated, and the fourth horizontal section has an output port for the medium to be heated.

[0011] In some embodiments, the phase change heat exchanger further comprises a first fin and a second fin, wherein the first fin is disposed in the bottom chamber and the first fin is disposed on the outer wall of the first heat exchange tube; the second fin is disposed in the top chamber and the second fin is disposed on the outer wall of the second heat exchange tube. When the bottom chamber contains the liquid medium, the liquid medium immerses the first fin.

[0012] In some embodiments, the phase change heat exchanger further includes a fan, which is disposed in the top chamber. The fan is disposed corresponding to the second heat exchange tube and the second fin, and the second heat exchange tube and the second fin are both located on the air supply path of the fan.

[0013] In some embodiments, the phase change heat exchanger further includes a liquid level meter, which is disposed in the bottom chamber and connected to the housing, and is used to detect the liquid level of the liquid medium contained in the bottom chamber.

[0014] In some embodiments, the phase change heat exchanger further includes a two-way delivery valve connected to the shell and in communication with the bottom chamber, and the two-way delivery valve is used to inject or discharge liquid medium into the bottom chamber.

[0015] In some embodiments, the phase change heat exchanger further includes a pressure control component, which is disposed in the housing and communicated with the top chamber, and is used to detect and control the pressure in the cavity.

[0016] In some embodiments, the phase change heat exchanger further includes a safety relief valve, which is disposed on the outer shell and is connected to the top chamber. When the pressure in the cavity is greater than a threshold of the safety relief valve, the safety relief valve opens to release the pressure in the cavity.

[0017] On the other hand, an embodiment of the present application provides a heat pump system, comprising the phase change heat exchanger of any of the above embodiments.

[0018] According to the phase change heat exchanger and heat pump system provided by the present application, the shell of the phase change heat exchanger is provided with a cavity, and the cavity includes a top chamber and a bottom chamber distributed in the vertical direction. The first heat exchange tube is arranged in the bottom chamber, and the first heat exchange tube is used to transport the heat exchange medium for heating the liquid medium. When the liquid medium is contained in the bottom chamber, the liquid medium immerses the first heat exchange tube. The heat exchange medium in the first heat exchange tube can heat the liquid medium so that the liquid medium evaporates and boils to produce a gaseous medium. The heat of the heat exchange medium can be conducted to the liquid medium contained in the bottom chamber through the first heat exchange tube, thereby heating the liquid medium. After the temperature of the liquid medium rises to the saturation temperature, it evaporates and boils to produce a gaseous medium, so that the inside of the shell is in a gas-liquid two-phase state. The liquid medium is located in the bottom chamber of the phase change heat exchanger, and the gaseous medium fills the top chamber. The second heat exchange tube is arranged in the top chamber. The second heat exchange tube is used to transport the medium to be heated. The gaseous medium in the top chamber transfers heat to the medium to be heated in the second heat exchange tube through the second heat exchange tube, so as to heat the medium to be heated in the second heat exchange tube. After releasing heat, the temperature of the gaseous medium decreases and condenses to form a liquid medium, which flows back into the bottom chamber under the action of gravity. The phase change heat exchanger of the embodiment of the present application can directly realize heat exchange between the first heat exchange tube and the second heat exchange tube by converting the medium in the bottom chamber and the top chamber between gas and liquid phases. Therefore, the phase change heat exchanger of the embodiment of the present application can eliminate intermediate circulation systems such as medium circulation pipes and water pumps, so that the overall structure of the phase change heat exchanger is simple, the footprint is small, the cost is low and the operation efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0020] Figure 1 is a schematic diagram of the structure of a phase change heat exchanger provided in some embodiments of the present application;

[0021] Figure 2 is a system schematic diagram of a heat pump system provided in some embodiments of the present application.

[0022] Marking Description:

[0023] 1. Phase change heat exchanger;

[0024] 10. housing; 101. cavity; 1011. top chamber; 1012. bottom chamber;

[0025] 20, first heat exchange tube; 201, first horizontal section; 2011, heat exchange medium input port; 202, first bending section; 203, second horizontal section; 2031, heat exchange medium output port;

[0026] 30, second heat exchange tube; 301, third horizontal section; 3011, input port of medium to be heated; 302, second bending section; 303, fourth horizontal section; 3031, output port of medium to be heated;

[0027] 40. First fin;

[0028] 50. Second fin;

[0029] 60. Fan;

[0030] 70. Liquid level gauge;

[0031] 80. Two-way delivery valve;

[0032] 90. Pressure control components;

[0033] 11. Safety relief valve;

[0034] 12. Vacuum valve;

[0035] 13. Expansion valve;

[0036] 14. Evaporator;

[0037] 15. Compressor.

[0038] In the drawings, the same reference numerals are used for the same components. The drawings are not drawn to scale. DETAILED DESCRIPTION

[0039] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0040] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0041] On the one hand, see Figure 1 and Figure 2 The embodiment of the present application provides a phase change heat exchanger 1, which includes a shell 10, a first heat exchange tube 20 and a second heat exchange tube 30. The shell 10 is provided with a cavity 101. The cavity 101 includes a top chamber 1011 and a bottom chamber 1012 distributed in the vertical direction. The top chamber 1011 and the bottom chamber 1012 are connected. The bottom chamber 1012 is used to accommodate a liquid medium. The first heat exchange tube 20 is arranged in the bottom chamber 1012. The first heat exchange tube 20 is used to transport a heat exchange medium that heats the liquid medium. The first heat exchange tube 20 is used to heat the liquid medium to generate a gaseous medium. The gaseous medium fills the top chamber 1011. The second heat exchange tube 30 is arranged in the top chamber 1011. In the vertical direction, the first heat exchange tube 20 and the second heat exchange tube 30 are arranged at intervals. The second heat exchange tube 30 is used to transport the medium to be heated. The gaseous medium heats the medium to be heated and condenses to form a liquid medium which flows back to the bottom chamber 1012 .

[0042] In some embodiments, along the vertical direction, the upper half of the housing 10 forms a top chamber 1011 , and the lower half forms a bottom chamber 1012 .

[0043] In some embodiments, the liquid medium may be, but is not limited to, deionized water. The medium to be heated may be a corrosive oil-water mixture fluid with a high freezing point. The heat exchange medium may be a refrigerant. The number of the first heat exchange tube 20 and the second heat exchange tube 30 may be one or more, and the medium to be heated may be one or more strands. In the embodiment of the present application, adaptive adjustment may be made according to factors such as the heat exchange area and heat exchange amount of the phase change heat exchanger 1.

[0044] In some embodiments, the second heat exchange tube 30 is detachably connected to the housing 10. For example, the second heat exchange tube 30 is detachably connected to the housing 10 via a flange, so that when the corrosive medium to be heated corrodes and damages the second heat exchange tube 30, the second heat exchange tube 30 can be removed for replacement, thereby reducing costs.

[0045] In summary, according to the phase change heat exchanger 1 provided in one embodiment of the present application, the shell 10 of the phase change heat exchanger 1 is provided with a cavity 101. The cavity 101 includes a top chamber 1011 and a bottom chamber 1012 distributed in the vertical direction. The first heat exchange tube 20 is arranged in the bottom chamber 1012. The first heat exchange tube 20 is used to transport a heat exchange medium for heating a liquid medium. When the bottom chamber 1012 contains a liquid medium, the liquid medium immerses the first heat exchange tube 20. The heat exchange medium in the first heat exchange tube 20 can heat the liquid medium so that the liquid medium evaporates and boils to produce a gaseous medium. The heat of the heat exchange medium can be conducted to the liquid medium contained in the bottom chamber 1012 through the first heat exchange tube 20, thereby heating the liquid medium. After the temperature of the liquid medium rises to the saturation temperature, it evaporates and boils to produce a gaseous medium, so that the interior of the shell 10 is in a gas-liquid two-phase state. The liquid medium is located in the bottom chamber 1012 of the phase change heat exchanger 1, and the gaseous medium fills the top chamber 1011. The second heat exchange tube 30 is arranged in the top chamber 1011. The second heat exchange tube 30 is used to transport the medium to be heated. The gaseous medium in the top chamber 1011 transfers heat to the medium to be heated in the second heat exchange tube 30 through the second heat exchange tube 30 to heat the medium to be heated in the second heat exchange tube 30. The gaseous medium condenses and releases heat to form a liquid medium, which flows back to the bottom chamber 1012 under the action of gravity. The phase change heat exchanger 1 of the embodiment of the present application can directly realize heat exchange between the first heat exchange tube 20 and the second heat exchange tube 30 through the conversion of the medium in the bottom chamber 1012 and the top chamber 1011 between the gas and liquid phases. Therefore, the phase change heat exchanger 1 of the embodiment of the present application can omit the intermediate circulation system such as the medium circulation pipeline and the water pump, so that the overall structure of the phase change heat exchanger 1 is simple, the footprint is small, the cost is low and the operation efficiency is high.

[0046] In some embodiments, see Figure 1 The first heat exchange tube 20 includes a first horizontal section 201, a first bending section 202 and a second horizontal section 203. The first horizontal section 201 and the second horizontal section 203 are respectively connected to the two ends of the first bending section 202. In the vertical direction, the first horizontal section 201 and the second horizontal section 203 are arranged at intervals. The first horizontal section 201 has a heat exchange medium input port 2011. The second horizontal section 203 has a heat exchange medium output port 2031.

[0047] In some examples, along the vertical direction, the first horizontal section 201 is located above the second horizontal section 203. When the bottom chamber 1012 contains a liquid medium, the first horizontal section 201 is closer to the liquid surface of the liquid medium than the second horizontal section 203. The temperature of the heat exchange medium input into the first horizontal section 201 is relatively high, so that the heat exchange medium of the first horizontal section 201 can transfer heat to the upper part of the liquid medium, so that the upper part of the liquid medium is heated up faster, which is conducive to faster evaporation and boiling of the liquid medium surface to produce gaseous medium. The first horizontal section 201 is farther away from the inner wall of the shell 10 than the second horizontal section 203, which is conducive to reducing the possibility that part of the heat of the first horizontal section 201 is transferred to the liquid medium and released to the external environment through the liquid medium and the shell 10, resulting in heat waste and failure to be used to heat the liquid medium, thereby improving the heat exchange efficiency.

[0048] In some examples, the lengths of the first horizontal section 201 and the second horizontal section 203 are equal. The first bending section 202 is U-shaped. The first bending section 202 is disposed close to the inner wall of the housing 10 away from the heat exchange medium input port 2011 .

[0049] The phase change heat exchanger 1 provided in one embodiment of the present application is configured such that the first heat exchange tube 20 includes a first horizontal section 201, a first bending section 202, and a second horizontal section 203, and the first horizontal section 201 and the second horizontal section 203 are respectively connected to both ends of the first bending section 202. In the vertical direction, the first horizontal section 201 and the second horizontal section 203 are arranged at intervals, so that the first heat exchange tube 20 has a simple structure and high heat exchange efficiency.

[0050] In some embodiments, the second heat exchange tube 30 includes a third horizontal section 301, a second bending section 302, and a fourth horizontal section 303. The third horizontal section 301 and the fourth horizontal section 303 are connected to both ends of the second bending section 302. In the vertical direction, the third horizontal section 301 and the fourth horizontal section 303 are arranged at intervals. The third horizontal section 301 has an input port 3011 for the medium to be heated. The fourth horizontal section 303 has an output port 3031 for the medium to be heated.

[0051] In some examples, along the vertical direction, the fourth horizontal section 303 is located below the third horizontal section 301. When the bottom chamber 1012 contains a liquid medium, the fourth horizontal section 303 is closer to the liquid surface of the liquid medium relative to the third horizontal section 301. The closer the gaseous medium is to the liquid medium, the higher its own temperature is. Therefore, the gaseous medium generated by the evaporation and boiling of the liquid medium can transfer heat to the fourth horizontal section 303 more quickly, so as to transfer more heat to the medium to be heated in the second heat exchange tube 30, which is conducive to reducing heat waste and improving heat exchange efficiency. At the same time, it is conducive to ensuring that the temperature of the medium to be heated in the fourth horizontal section 303 is in a high temperature state, effectively avoiding the possibility of a drop in the temperature of the medium to be heated output from the fourth horizontal section 303.

[0052] In some embodiments, the third horizontal section 301 is equal to the fourth horizontal section 303 in length. The second bending section 302 is U-shaped. The second bending section 302 is disposed close to the inner wall of the housing 10 away from the outlet 3031 of the medium to be heated.

[0053] The phase change heat exchanger 1 provided in one embodiment of the present application is configured such that the second heat exchange tube 30 includes a third horizontal section 301, a second bending section 302 and a fourth horizontal section 303, and the third horizontal section 301 and the fourth horizontal section 303 are connected to both ends of the second bending section 302. In the vertical direction, the third horizontal section 301 and the fourth horizontal section 303 are arranged at intervals, so that the second heat exchange tube 30 has a simple structure and high heat exchange efficiency.

[0054] In some embodiments, the phase change heat exchanger 1 further includes a first fin 40. The first fin 40 is disposed in the bottom chamber 1012. The first fin 40 is disposed on the outer wall of the first heat exchange tube 20. When the bottom chamber 1012 contains the liquid medium, the liquid medium immerses the first fin 40.

[0055] The heat exchange medium in the first heat exchange tube 20 can transfer heat to the liquid medium through the first heat exchange tube 20 and the first fin 40. The sum of the contact area between the first heat exchange tube 20 and the liquid medium and the contact area between the first fin 40 and the liquid medium is large, which is conducive to enhancing the heat exchange effect between the heat exchange medium and the liquid medium, so as to effectively shorten the time for heating the liquid medium and generating the gaseous medium from the liquid medium.

[0056] In some examples, the first fin 40 and the first heat exchange tube 20 are an integrally formed structure, which is beneficial to reducing the thermal resistance between the first fin 40 and the first heat exchange tube 20 and improving the heat conduction effect.

[0057] In some examples, there may be a plurality of first fins 40. The plurality of first fins 40 are evenly and spaced apart on the outer wall of the first heat exchange tube 20, thereby further increasing the contact area between the first fins 40 and the liquid medium and further enhancing the heat exchange effect between the heat exchange medium and the liquid medium.

[0058] In some examples, the first fin 40 may be a hydrophilic high thermal conductivity fin.

[0059] In some embodiments, the phase change heat exchanger 1 further includes a second fin 50. The second fin 50 is disposed in the top chamber 1011. The second fin 50 is disposed on the outer wall of the second heat exchange tube 30. The gaseous medium generated by the evaporation of the liquid medium can transfer heat to the medium to be heated in the second heat exchange tube 30 through the second heat exchange tube 30 and the second fin 50. The sum of the contact area between the second heat exchange tube 30 and the gaseous medium and the contact area between the second fin 50 and the gaseous medium is large, which is conducive to strengthening the heat exchange effect between the gaseous medium and the medium to be heated, so as to effectively shorten the time for heating the medium to be heated and increasing the temperature of the medium to be heated.

[0060] In some examples, there may be a plurality of second fins 50. The plurality of second fins 50 are evenly and spaced apart on the outer wall of the second heat exchange tube 30, thereby further increasing the contact area between the second fins 50 and the gaseous medium and further enhancing the heat exchange effect between the gaseous medium and the medium to be heated.

[0061] In some embodiments, the second fin 50 may be a hydrophobic fin. After the gaseous medium condenses and releases heat to become a liquid medium, the liquid medium can more easily drip from the second fin 50 to the bottom chamber 1012, which helps to reduce the possibility that the condensed liquid medium adheres to the second fin 50 for too long, resulting in poor heat conduction to the medium to be heated.

[0062] In some examples, the second fin 50 and the second heat exchange tube 30 are an integrally formed structure, which is beneficial to reducing the thermal resistance between the second fin 50 and the second heat exchange tube 30 and improving the heat conduction effect.

[0063] In a phase change heat exchanger 1 provided in one embodiment of the present application, first fins 40 and second fins 50 are respectively provided on the outer wall of the first heat exchange tube 20 and the outer wall of the second heat exchange tube 30 , which is beneficial to enhancing the heat exchange effect of the phase change heat exchanger 1 .

[0064] In some embodiments, see Figure 1, along the horizontal direction, the heat exchange medium input port 2011 and the heat exchange medium output port 2031 of the first heat exchange tube 20 are respectively located on the same side of the shell 10. Along the horizontal direction, the heat exchange medium input port 3011 and the heat exchange medium output port 3031 of the second heat exchange tube 30 are located on the same side of the shell 10. Along the horizontal direction, the heat exchange medium input port 2011 and the heat exchange medium output port 2031 of the first heat exchange tube 20 are arranged on one of the two opposite sides of the shell 10, and the heat exchange medium input port 3011 and the heat exchange medium output port 3031 of the second heat exchange tube 30 are arranged on the other side. It can be understood that the heat exchange medium input port 2011 and the heat exchange medium output port 2031 of the first heat exchange tube 20 and the heat exchange medium input port 3011 and the heat exchange medium output port 3031 of the second heat exchange tube 30 can also be arranged on the same side of the shell 10.

[0065] In some embodiments, the temperature of the heat exchange medium at the heat exchange medium input port 2011 of the first heat exchange tube 20 is 75 degrees Celsius (°C). The temperature of the heat exchange medium at the heat exchange medium output port 2031 of the first heat exchange tube 20 is 65 degrees Celsius. The temperature of the medium to be heated at the heat exchange medium input port 3011 of the second heat exchange tube 30 is 25 degrees Celsius. The temperature of the medium to be heated at the heat exchange medium output port 3031 of the second heat exchange tube 30 is 55 degrees Celsius. The temperature of the liquid medium and the gaseous medium in the heat exchange tank is 60 degrees Celsius.

[0066] In some embodiments, see Figure 1 and Figure 2 The phase change heat exchanger 1 further includes a fan 60. The fan 60 is disposed in the top chamber 1011. The fan 60 is disposed corresponding to the second heat exchange tube 30 and the second fin 50. The second heat exchange tube 30 and the second fin 50 are both located on the air supply path of the fan 60.

[0067] The phase change heat exchanger 1 provided by one embodiment of the present application is provided with a fan 60, and the gaseous medium is blown by the fan 60, and the natural convection is changed to forced convection. After the gaseous medium exchanges heat with the medium to be heated in the second heat exchange tube 30, the gaseous medium is changed into a liquid medium again. After the liquid medium formed by the condensation of the gaseous medium is collected by the second heat exchange tube 30 and the second fin 50, it is disturbed by the fan 60, and the liquid medium can fall quickly and re-enter the bottom chamber 1012 of the phase change heat exchanger 1. After the second heat exchange tube 30 and the second fin 50 are disturbed by the fan 60, the gaseous medium is not easy to condense on the surface of the second heat exchange tube 30 and the second fin 50 to form a water film after the gaseous medium exchanges heat with the medium to be heated, which is conducive to reducing the possibility that the condensed liquid medium adheres to the second fin 50 for too long, resulting in a poor heat transfer effect to the medium to be heated, and the heat exchange effect can be significantly enhanced.

[0068] In some examples, along the horizontal direction, the second bending section 302 of the second heat exchange tube 30 is arranged close to the fan 60, and the installation angle of the fan 60 is determined according to the second heat exchange tube 30 and the second fin 50, so that the fan 60 can enhance the disturbance of the gaseous working medium of the second heat exchange tube 30 and the second fin 50 as a whole, thereby improving the working efficiency of the fan 60.

[0069] In some embodiments, the phase change heat exchanger 1 further comprises a liquid level meter 70. The liquid level meter 70 is disposed in the bottom chamber 1012. The liquid level meter 70 is connected to the housing 10. The liquid level meter 70 is used to detect the liquid level of the liquid medium contained in the bottom chamber 1012.

[0070] The phase change heat exchanger 1 provided in one embodiment of the present application is provided with a liquid level meter 70 to facilitate detection of the amount of liquid medium injected into the bottom chamber 1012 .

[0071] In some embodiments, the phase change heat exchanger 1 further includes a two-way delivery valve 80. The two-way delivery valve 80 is connected to the housing 10. The two-way delivery valve 80 is connected to the bottom chamber 1012. The two-way delivery valve 80 is used to inject or discharge liquid medium into the bottom chamber 1012. During the use of the phase change heat exchanger 1, the two-way delivery valve 80 can inject liquid medium into the bottom chamber 1012. For example, when the injected liquid medium reaches the upper limit of the liquid level gauge 70, the injection is stopped. When the phase change heat exchanger 1 is maintained, part of the liquid medium can be discharged through the two-way delivery valve 80 to detect the liquid medium. When the phase change heat exchanger 1 is overhauled, the liquid medium can be emptied through the two-way delivery valve 80.

[0072] The phase change heat exchanger 1 provided in one embodiment of the present application is provided with a two-way delivery valve 80 , and the two-way delivery valve 80 is connected to the shell 10 , so as to facilitate the injection or discharge of liquid medium into the bottom chamber 1012 .

[0073] In some examples, the two-way delivery valve 80 may be a manual valve, an electric valve, or a solenoid valve.

[0074] In some embodiments, the phase change heat exchanger 1 further includes a vacuum valve 12. The vacuum valve 12 is disposed on the housing 10. The vacuum valve 12 is connected to the top chamber 1011.

[0075] The phase change heat exchanger 1 provided in one embodiment of the present application can form a vacuum environment in the top chamber 1011 by setting a vacuum valve 12. Before using the phase change heat exchanger 1, liquid medium is added to the bottom chamber 1012 to the upper limit position in advance through the two-way delivery valve 80. Then, the inside of the phase change heat exchanger 1 is evacuated by an external vacuum pump through the vacuum valve 12 to remove air and non-condensable gases and other gases that affect the heat exchange efficiency inside the phase change heat exchanger 1. Before using the phase change heat exchanger 1, preheating is performed through the first heat exchange tube 20, and the pressure inside the phase change heat exchanger 1 is controlled to the required pressure through the vacuum valve 12. The inside of the phase change heat exchanger 1 is a closed system, and the loss during the circulation of the liquid medium can be ignored, so the internal pressure of the phase change heat exchanger 1 can also remain unchanged after the debugging is completed.

[0076] In some examples, the liquid medium may be deionized water. When the internal pressure of the phase change heat exchanger 1 is an absolute pressure of 19.946 kPa, the saturation temperature of the liquid medium is 60 degrees Celsius. When the temperature of the liquid medium reaches 60 degrees Celsius, the liquid medium evaporates and boils to generate a gaseous medium.

[0077] The liquid medium exchanges heat with the heat exchange medium in the bottom chamber 1012 of the phase change heat exchanger 1. When the liquid medium evaporates and boils, saturated steam is generated. The saturated steam condenses and exchanges heat with the medium to be heated in the second heat exchange tube 30 in the top chamber 1011 of the phase change heat exchanger 1, releasing a large amount of heat, and the saturated steam condenses into small liquid droplets. The condensed and liquefied small droplets re-enter the liquid medium in the bottom chamber 1012. The phase change heat exchanger 1 can form a dynamic balance between the gas and liquid phases, while maintaining the balance of heat exchange.

[0078] In some embodiments, the phase change heat exchanger 1 further comprises a pressure control assembly 90. The pressure control assembly 90 is disposed in the housing 10. The pressure control assembly 90 is in communication with the top chamber 1011. The pressure control assembly 90 is used to detect and control the pressure in the cavity 101. In some examples, the pressure control assembly 90 comprises a pressure sensor and a controller.

[0079] The phase change heat exchanger 1 provided in one embodiment of the present application is provided with a pressure control component 90, so as to facilitate detection and control of the pressure in the top chamber 1011, and is conducive to accurately adjusting the internal pressure of the phase change heat exchanger 1 to the required pressure.

[0080] In some embodiments, the phase change heat exchanger 1 further includes a safety relief valve 11. The safety relief valve 11 is disposed on the housing 10. The safety relief valve 11 is connected to the top chamber 1011. When the pressure in the cavity 101 is greater than the threshold of the safety relief valve 11, the safety relief valve 11 opens to release the pressure in the cavity 101, thereby facilitating the safety of the phase change heat exchanger 1 during use.

[0081] The phase change heat exchanger 1 provided in one embodiment of the present application is provided with a safety relief valve 11. When the second heat exchange tube 30 is corroded and perforated, the pressure in the phase change heat exchanger 1 will exceed the safety threshold. At this time, the safety relief valve 11 can automatically release the pressure in the phase change heat exchanger 1 to ensure the safety of the phase change heat exchanger 1.

[0082] On the other hand, an embodiment of the present application further provides a heat pump system, comprising the phase change heat exchanger 1 of any of the above embodiments.

[0083] In some embodiments, the heat pump system further comprises an expansion valve 13, an evaporator 14 and a compressor 15. The inlet of the expansion valve 13 is connected to the outlet of the first heat exchange tube 20. The outlet of the compressor 15 is connected to the inlet of the first heat exchange tube 20.

[0084] In some embodiments, the heat pump system further includes an expansion valve 13. The expansion valve 13 is disposed between the evaporator 14 and the first heat exchange tube 20. The expansion valve 13 is provided so that the medium-temperature and high-pressure liquid or gas-liquid two-phase heat exchange medium is throttled to become a low-temperature and low-pressure liquid heat exchange medium. The expansion valve 13 controls the valve flow rate by the change of the superheat at the outlet of the evaporator 14 to prevent the outlet of the evaporator 14 from being liquid-carrying.

[0085] In some embodiments, the heat pump system further includes an evaporator 14. The evaporator 14 is disposed between the expansion valve 13 and the compressor 15. By providing the evaporator 14, the liquid heat exchange medium can be converted into a gaseous heat exchange medium. The heat exchange medium can be a cold medium (ie, a refrigerant).

[0086] In some embodiments, the heat pump system further includes a compressor 15. The outlet of the compressor 15 is connected to the inlet of the first heat exchange pipe 20. The inlet of the compressor 15 is connected to the outlet of the evaporator 14. The compressor 15 is provided to convert the low-temperature and low-pressure gaseous heat exchange medium into a high-temperature and high-pressure gaseous heat exchange medium.

[0087] The heat pump system provided in one embodiment of the present application, because it includes the phase change heat exchanger 1 provided in the above embodiments, has the advantages of simple structure, small footprint, low cost and high operating efficiency.

[0088] The working principle of the heat pump system in the embodiment of the present application:

[0089] Open the two-way delivery valve 80, inject the liquid medium into the bottom chamber 1012, and use the vacuum valve 12 to evacuate the top chamber 1011;

[0090] The heat exchange medium is injected into the first heat exchange tube 20 from the heat exchange medium input port 2011, and the heat exchange medium exchanges heat with the liquid medium. After the heat exchange is completed, the heat exchange medium enters the expansion valve 13 through the heat exchange medium output port 2031;

[0091] After the liquid medium and the heat exchange medium complete the heat exchange, part of the liquid medium evaporates and boils to become a gaseous medium, which is gathered in the top chamber 1011. The medium to be heated is injected into the second heat exchange tube 30 from the medium to be heated input port 3011. The medium to be heated exchanges heat with the gaseous medium. After the heat exchange is completed, the medium to be heated flows out from the medium to be heated output port 3031.

[0092] After the gaseous medium exchanges heat with the medium to be heated, it condenses and turns into a liquid medium again. After being collected by the second heat exchange tube 30 and the second fin 50, it is disturbed by the fan 60, falls rapidly, and re-enters the bottom chamber 1012, so that a dynamic balance is formed between the gaseous medium and the liquid medium, while maintaining the balance of heat exchange.

[0093] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. A phase change heat exchanger, characterized in that: include: The housing is provided with a cavity, wherein the cavity includes a top cavity and a bottom cavity distributed in a vertical direction, the top cavity and the bottom cavity are connected, and the bottom cavity is used to contain a liquid medium; a first heat exchange tube, disposed in the bottom chamber, the first heat exchange tube being used to transport a heat exchange medium for heating the liquid medium, the first heat exchange tube being used to heat the liquid medium to generate a gaseous medium, the gaseous medium filling the top chamber; The second heat exchange tube is arranged in the top chamber. Along the vertical direction, the first heat exchange tube and the second heat exchange tube are arranged at intervals. When the bottom chamber accommodates the liquid medium, the second heat exchange tube is used to transport the medium to be heated. The gaseous medium heats the medium to be heated and condenses to form the liquid medium.

2. The phase change heat exchanger according to claim 1, characterized in that: The first heat exchange tube includes a first horizontal section, a first bending section, and a second horizontal section. The first horizontal section and the second horizontal section are respectively connected to two ends of the first bending section. Along the vertical direction, the first horizontal section and the second horizontal section are arranged at intervals. The first horizontal section has a heat exchange medium input port, and the second horizontal section has a heat exchange medium output port.

3. The phase change heat exchanger according to claim 1, characterized in that: The second heat exchange tube includes a third horizontal section, a second bending section and a fourth horizontal section, the third horizontal section and the fourth horizontal section are connected to two ends of the second bending section, and along the vertical direction, the third horizontal section and the fourth horizontal section are arranged at intervals, the third horizontal section has an input port for the medium to be heated, and the fourth horizontal section has an output port for the medium to be heated.

4. The phase change heat exchanger according to claim 1, characterized in that: The phase change heat exchanger also includes a first fin and a second fin, wherein the first fin is arranged in the bottom chamber, and the first fin is arranged on the outer wall of the first heat exchange tube; the second fin is arranged in the top chamber, and the second fin is arranged on the outer wall of the second heat exchange tube, and when the bottom chamber accommodates the liquid medium, the liquid medium immerses the first fin.

5. The phase change heat exchanger according to claim 4, characterized in that: The phase change heat exchanger further includes a fan, which is disposed in the top chamber. The fan is disposed corresponding to the second heat exchange tube and the second fin, and the second heat exchange tube and the second fin are both located on an air supply path of the fan.

6. The phase change heat exchanger according to claim 1, characterized in that: The phase change heat exchanger further comprises a liquid level meter, which is disposed in the bottom chamber and connected to the housing, and is used to detect the liquid level of the liquid medium contained in the bottom chamber.

7. The phase change heat exchanger according to claim 1, characterized in that: The phase change heat exchanger further comprises a two-way delivery valve, which is connected to the shell and communicates with the bottom chamber, and is used for injecting or discharging the liquid medium into or out of the bottom chamber.

8. The phase change heat exchanger according to claim 1, characterized in that: The phase change heat exchanger further comprises a pressure control component, wherein the pressure control component is arranged on the shell, the pressure control component is communicated with the top chamber, and the pressure control component is used to detect and control the pressure in the cavity.

9. The phase change heat exchanger according to claim 8, characterized in that: The phase change heat exchanger further includes a safety relief valve, which is disposed on the shell and communicated with the top chamber. When the pressure in the cavity is greater than a threshold of the safety relief valve, the safety relief valve opens to release the pressure in the cavity.

10. A heat pump system, characterized in that: It comprises the phase change heat exchanger as claimed in any one of claims 1 to 9.

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