CN113847827A

CN113847827A - Tank type heat exchanger and heat pump system

Info

Publication number: CN113847827A
Application number: CN202111233900.7A
Authority: CN
Inventors: 马剑; 李丰; 田帆
Original assignee: GD Midea Heating and Ventilating Equipment Co Ltd; Hefei Midea Heating and Ventilating Equipment Co Ltd
Current assignee: GD Midea Heating and Ventilating Equipment Co Ltd; Hefei Midea Heating and Ventilating Equipment Co Ltd
Priority date: 2021-10-22
Filing date: 2021-10-22
Publication date: 2021-12-28
Anticipated expiration: 2041-10-22
Also published as: CN113847827B; WO2023066118A1

Abstract

The application provides a tank heat exchanger and heat pump system relates to the heat exchanger field. The pot-type heat exchanger comprises an outer barrel, an inner barrel, a heat exchange tube, a liquid tube and an air tube. The inner cylinder is arranged in the outer cylinder. The heat exchange tube is arranged between the inner barrel and the outer barrel and is spirally wound outside the inner barrel. The liquid pipe is used for providing liquid refrigerant to the inner cylinder or sucking the liquid refrigerant from the inner cylinder. The gas pipe is used for sucking gaseous refrigerant from between the inner cylinder and the outer cylinder or supplying the gaseous refrigerant to between the inner cylinder and the outer cylinder. Wherein, the inner cylinder is provided with a spraying hole, and the spraying hole is used for spraying the liquid refrigerant in the inner cylinder to the heat exchange tube. The heat pump system comprises the tank heat exchanger described above. This pot-type heat exchanger provides liquid refrigerant through liquid pipe to the inner tube for liquid refrigerant rises gradually at the liquid level of inner tube, and when the liquid level reached the position that sprays the hole place, liquid refrigerant sprayed to the heat exchange tube from spraying the hole, forms the liquid film on the surface of heat exchange tube, so that liquid refrigerant and the fluid in the heat exchange tube carry out the heat exchange.

Description

Tank type heat exchanger and heat pump system

Technical Field

The application relates to the field of heat exchangers, in particular to a tank type heat exchanger and a heat pump system.

Background

The tank type heat exchanger is a tank type heat exchanger, also called a high-efficiency tank. When the tank type heat exchanger is used as a condenser, compared with a shell and tube type heat exchanger, the tank type heat exchanger has the advantages of small volume and high heat exchange efficiency. But when the evaporator is used as an evaporator, the heat exchange efficiency is low.

Disclosure of Invention

An object of the embodiment of the application is to provide a tank heat exchanger and a heat pump system, which are used as an evaporator and have high heat exchange efficiency.

In a first aspect, an embodiment of the present application provides a tank heat exchanger, which includes an outer cylinder, an inner cylinder, a heat exchange tube, a liquid tube, and a gas tube. The inner cylinder is arranged in the outer cylinder. The heat exchange tube is arranged between the inner barrel and the outer barrel and is spirally wound outside the inner barrel. The liquid pipe extends into the inner cylinder and is used for supplying liquid refrigerant to the inner cylinder or sucking the liquid refrigerant from the inner cylinder. The air pipe is arranged on the outer cylinder and used for sucking gaseous refrigerants from between the inner cylinder and the outer cylinder or providing the gaseous refrigerants to between the inner cylinder and the outer cylinder. Wherein, the inner cylinder is provided with a spraying hole, and the spraying hole is used for spraying the liquid refrigerant in the inner cylinder to the heat exchange tube to reduce the main pipe area of the heat exchange tube.

In above-mentioned technical scheme, when this pot-type heat exchanger was used as the evaporimeter, provided liquid refrigerant to the inner tube through the liquid pipe for liquid refrigerant rises gradually at the liquid level of inner tube, when the liquid level reached the position at spray hole place, liquid refrigerant blowout from spray hole to spray to the heat exchange tube, form the liquid film on the surface of heat exchange tube, so that liquid refrigerant carries out the heat exchange with the fluid in the heat exchange tube, reduce the dry tube district of heat exchange tube, promote heat exchange efficiency.

As an optional technical scheme of the embodiment of the application, the spraying holes are formed in the middle of the inner cylinder in the height direction of the tank type heat exchanger.

In the technical scheme, the spraying holes are formed in the middle of the inner barrel, so that the liquid refrigerant sprayed from the spraying holes can be sprayed to the heat exchange tube, the liquid refrigerant is small in height required to rise on the liquid level of the inner barrel, the time required for the liquid refrigerant to reach the height of the spraying holes (the liquid refrigerant is sprayed out from the spraying holes) from the liquid pipe to the liquid level of the liquid refrigerant is short, and quick spraying is achieved.

As an optional technical scheme of this application embodiment, the hole that sprays is provided with a plurality ofly, and a plurality of holes that spray distribute along the circumference of inner tube.

In the technical scheme, the liquid refrigerant can be guaranteed to be uniformly sprayed to the heat exchange tube by arranging the plurality of spraying holes along the circumferential direction of the inner cylinder.

As an optional technical scheme of the embodiment of the application, the lower end of the inner cylinder is provided with a communication hole which is communicated with the inner cylinder and the outer cylinder.

In the above technical scheme, the communication hole is formed at the lower end of the inner cylinder, when the liquid pipe supplies the liquid refrigerant to the inner cylinder, a part of the liquid refrigerant flows out of the inner cylinder through the communication hole and enters between the inner cylinder and the outer cylinder, and the other part of the liquid refrigerant is left in the inner cylinder. And the communicating hole generates pressure loss, so that the liquid level inside the inner cylinder is higher than the liquid level outside the inner cylinder. When the liquid level in the inner cylinder reaches the height of the spraying holes, the liquid refrigerant in the inner cylinder sprays to the heat exchange tube through the spraying holes. And the existence of the communication hole can lead the air pressure in the inner cylinder to be larger than the air pressure outside the inner cylinder, so that the liquid refrigerant is easier to spray outside the inner cylinder. In addition, the liquid refrigerant which enters the space between the inner cylinder and the outer cylinder through the communicating hole firstly exchanges heat with the heat exchange tube, and the problem that the heat exchange cannot be carried out before the liquid level in the inner cylinder does not reach the height of the spraying hole is relieved to a certain extent. More importantly, the liquid refrigerant that gets into between inner tube and the urceolus through the intercommunicating pore earlier carries out the heat exchange with the heat exchange tube earlier, and liquid refrigerant can gasify to gaseous refrigerant, and gaseous refrigerant upward movement can drive from spraying hole spun liquid refrigerant upward movement for liquid refrigerant is attached to on being located the heat exchange tube that sprays the hole top, and forms the liquid film, carries out the heat exchange with the heat exchange tube, has promoted tank heat exchanger's heat exchange efficiency.

As an optional technical scheme of the embodiment of the application, the tank type heat exchanger comprises a one-way valve, and the one-way valve is arranged in the inner cylinder. The inner space of the inner cylinder is divided into an upper chamber and a lower chamber by the one-way valve, the spraying holes are formed in the wall surface of the upper chamber, and the communication holes are formed in the wall surface of the lower chamber. One end of the liquid pipe extends into the lower cavity to provide liquid refrigerant to the lower cavity. The check valve is configured to allow refrigerant to enter the upper chamber from the lower chamber and to prevent refrigerant from entering the lower chamber from the upper chamber.

In the technical scheme, by arranging the one-way valve, when the tank type heat exchanger is used as an evaporator, the liquid pipe provides liquid refrigerant to the lower cavity, part of the liquid refrigerant enters between the inner cylinder and the outer cylinder through the communicating hole, and the other part of the liquid refrigerant is left in the lower cavity. The liquid level of the liquid refrigerant in the lower chamber gradually rises and reaches the position of the one-way valve, and at the moment, the one-way valve is opened to allow the liquid refrigerant in the lower chamber to enter the upper chamber. The liquid level height of the liquid refrigerant in the upper cavity gradually rises until the liquid level height reaches the position of the spraying hole, and the liquid refrigerant in the upper cavity is sprayed out of the spraying hole and sprayed onto the heat exchange tube. After the liquid refrigerant exchanges heat with the heat exchange tube, the liquid refrigerant is changed into a gaseous refrigerant and is discharged from the air tube. When the tank type heat exchanger is used as a condenser, a gas pipe provides a gaseous refrigerant between the inner cylinder and the outer cylinder, one part of the gaseous refrigerant enters the upper cavity from the spraying hole, the other part of the gaseous refrigerant enters the lower cavity from the communicating hole after being liquefied, and the refrigerant is prevented from entering the lower cavity from the upper cavity by the check valve, so that the gaseous refrigerant which enters the upper cavity and is not fully subjected to heat exchange cannot be discharged out of the tank type heat exchanger. Only the refrigerant entering the lower chamber through the communicating hole (because the communicating hole is positioned at the lower end of the inner cylinder, when the refrigerant reaches the communicating hole, the refrigerant is fully subjected to heat exchange, and the gaseous refrigerant is liquefied into liquid refrigerant) can be drawn out of the tank type heat exchanger by the liquid pipe.

As an optional technical scheme of the embodiment of the application, the one-way valve sleeve is arranged on the liquid pipe.

In the technical scheme, the liquid pipe penetrates through the one-way valve, the structure is simple and compact, and the size of the tank type heat exchanger is favorably reduced.

As an alternative solution of the embodiment of the present application, the inner cylinder includes a first cylinder portion and a second cylinder portion, and the first cylinder portion is connected to the second cylinder portion. The internal space of the first tubular portion and the internal space of the second tubular portion are independent of each other. The spraying hole is arranged on the first cylinder part, and the communicating hole is arranged on the second cylinder part. The liquid pipe is configured to supply a part of liquid refrigerant into the first cylinder part and supply the other part of liquid refrigerant into the second cylinder part.

In the above technical solution, by providing the first tube part and the second tube part, the inner space of the first tube part and the inner space of the second tube part are independent of each other, the first tube part is provided with a spray hole, the second tube part is provided with a communication hole, the liquid refrigerant supplied from the liquid pipe to the first tube part can be sprayed to the heat exchange tube from the spray hole provided in the first tube part, the liquid refrigerant supplied from the liquid pipe to the second tube part can enter between the inner tube and the outer tube from the communication hole provided in the second tube part and contact with the heat exchange tube for heat exchange, and after the liquid refrigerant is gasified into a gaseous refrigerant, the liquid refrigerant sprayed from the spray hole can be further driven to move upwards, so that the liquid refrigerant adheres to the heat exchange tube above the spray hole and exchanges heat with the liquid refrigerant.

As an optional technical scheme of this application embodiment, the one end of liquid pipe stretches into in the second section of thick bamboo portion, is provided with by-pass hole or bypass branch road on the pipe wall of liquid pipe, and by-pass hole or bypass branch road communicate with the inner space of first section of thick bamboo portion.

In the above technical scheme, one end of the liquid pipe is extended into the second cylinder part so as to provide liquid refrigerant for the second cylinder part. The liquid refrigerant is conveniently provided for the first cylinder part by arranging the bypass hole or the bypass branch on the liquid pipe.

As an optional technical scheme of the embodiment of the application, the tank type heat exchanger further comprises a control valve, the control valve is arranged at the position of the bypass hole or on the bypass branch, and the control valve is used for controlling the liquid pipe to be communicated with or disconnected from the inner space of the first barrel part.

In the above technical scheme, through setting up the control valve, when the pot-type heat exchanger was as the evaporimeter, the liquid refrigerant that the liquid pipe provided in to first section of thick bamboo portion can be followed and set up the hole that sprays to the heat exchange tube in the first section of thick bamboo portion, the liquid refrigerant that the liquid pipe provided in to the second section of thick bamboo portion can get into between inner tube and the urceolus from the intercommunicating pore that sets up in the second section of thick bamboo portion, and contact with the heat exchange tube and carry out the heat transfer, behind the liquid refrigerant gasification for gaseous refrigerant, can further drive from the liquid refrigerant upward movement of hole spun that sprays, make the liquid refrigerant adhere to on the heat exchange tube that is located spray the hole top, and carry out the heat exchange rather than. After the liquid refrigerant exchanges heat with the heat exchange tube, the liquid refrigerant is changed into a gaseous refrigerant and is discharged from the air tube. When the tank type heat exchanger is used as a condenser, the control valve is closed to prevent the refrigerant from being discharged from the bypass hole or the bypass branch. Gaseous refrigerant is provided between the inner cylinder and the outer cylinder through the air pipe, the gaseous refrigerant enters the first cylinder from the spraying hole and enters the second cylinder from the communicating hole, and the refrigerant is prevented from being discharged from the bypass hole or the bypass branch by the control valve, so that the gaseous refrigerant which enters the first cylinder and is not subjected to heat exchange sufficiently cannot be discharged out of the tank type heat exchanger. Only the refrigerant that has entered the second cylindrical portion through the communication hole (since the communication hole is located at the lower end of the inner cylinder, the refrigerant reaches the communication hole, heat exchange is sufficiently performed, and the gaseous refrigerant is liquefied into a liquid refrigerant) can be drawn out of the tank heat exchanger by the liquid pipe.

As an optional solution of the embodiment of the present application, the first cylinder portion is located above the second cylinder portion. The urceolus includes urceolus roof, urceolus lateral wall and urceolus diapire, and the upper end of first section of thick bamboo portion is sealed by the urceolus roof, and the lower extreme of second section of thick bamboo portion is sealed by the urceolus diapire. The first cylinder part comprises a first cylinder part bottom wall, and the upper end of the second cylinder part is closed by the first cylinder part bottom wall. One end of the liquid pipe penetrates through the bottom wall of the first barrel part and extends into the second barrel part.

In the above technical solution, the upper end of the first cylinder is closed by the top wall of the outer cylinder, so that the refrigerant can only enter and exit the first cylinder from the spray holes. The upper end of the second tube is closed by the first tube bottom wall, and the lower end of the second tube is closed by the outer tube bottom wall, so that the refrigerant can enter and exit the second tube only from the communication hole. In addition, the upper end of the first cylinder part is connected with the top wall of the outer cylinder, the lower end of the second cylinder part is connected with the bottom wall of the outer cylinder, and the first cylinder part is connected with the second cylinder part, so that the connection stability of the inner cylinder and the outer cylinder is improved. The upper end of the second cylinder part is sealed by the bottom wall of the first cylinder part, the bottom wall of the first cylinder part plays a role in separation, and the inner space of the second cylinder part is separated from the inner space of the first cylinder part, so that liquid refrigerant provided by the liquid pipe to the first cylinder part can be sprayed to the heat exchange pipe from the spraying hole formed in the first cylinder part, and the liquid refrigerant provided by the liquid pipe to the second cylinder part can enter between the inner cylinder and the outer cylinder from the communicating hole formed in the second cylinder part.

As an optional technical scheme of the embodiment of the application, the outer cylinder comprises an outer cylinder top wall, an outer cylinder side wall and an outer cylinder bottom wall, the second cylinder extends to the outer cylinder bottom wall from the plane where the outer cylinder top wall is located along the axial direction of the outer cylinder, and the first cylinder is sleeved on the upper portion of the second cylinder.

In the above technical scheme, the second cylinder part extends to the bottom wall of the outer cylinder from the plane where the top wall of the outer cylinder is located along the axial direction of the outer cylinder, so that the space of the second cylinder part is large enough to temporarily store liquid refrigerants when the flow of the liquid pipe fluctuates. The first cylinder part is sleeved on the second cylinder part, an annular cavity is formed between the first cylinder part and the second cylinder part, and the cross sectional area of the annular cavity is small, so that the liquid level in the first cylinder part can be quickly raised, and then liquid refrigerants can be quickly sprayed out of the spraying holes.

As an optional solution of the embodiment of the present application, the upper end of the first cylinder part is closed by the top wall of the outer cylinder.

In the technical scheme, the upper end of the first cylinder part is sealed through the top wall of the outer cylinder, so that the inner cylinder is completely accommodated in the outer cylinder, and the tank type heat exchanger is small in size.

As an optional technical scheme of the embodiment of the application, the upper end of the first barrel part extends out of the top wall of the outer barrel.

In the above technical solution, the upper end of the first cylinder portion extends out of the top wall of the outer cylinder, so that the first cylinder portion is convenient to be provided with the bypass branch, and the liquid pipe is convenient to supply the liquid refrigerant into the first cylinder portion and the second cylinder portion.

As an alternative solution to the embodiment of the present application, the cross-sectional area of the first cylindrical portion is larger than the cross-sectional area of the second cylindrical portion.

In the technical scheme, the cross-sectional area of the first barrel part is larger, so that the spraying holes are closer to the heat exchange tube, more spraying holes can be formed in the first barrel part, and the spraying efficiency is improved.

As an optional technical solution of the embodiment of the present application, the lower end of the liquid pipe is bent, so that the lower end surface of the liquid pipe has an included angle with the horizontal plane.

In above-mentioned technical scheme, through making the lower terminal surface of liquid pipe and horizontal plane have the contained angle, the lower terminal surface of liquid pipe has certain area in the direction of height, can allow the liquid level altitude variation of liquid refrigerant, can reduce the possibility that takes place the pulse imbibition during condensation.

As an optional technical scheme of the embodiment of the application, in the height direction of the tank type heat exchanger, the air pipe is positioned above the spraying holes.

In the technical scheme, the spraying holes are formed in the lower portion of the air pipe, so that the liquid refrigerant can not be sprayed on the air pipe in the spraying process of the spraying holes, the liquid refrigerant which does not exchange heat with the heat exchange pipe can not be directly discharged from the air pipe, the liquid refrigerant can fully exchange heat with the heat exchange pipe, and the heat exchange efficiency of the tank-type heat exchanger is improved.

In a second aspect, embodiments of the present application provide a heat pump system including the tank heat exchanger described above. The heat pump system is provided with the tank type heat exchanger, so that the heat pump system has high heat exchange efficiency.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

Fig. 1 is a schematic structural diagram of a heat pump system (without a four-way valve) according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of a heat pump system (with a four-way valve and a tank heat exchanger as an evaporator) provided by an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a heat pump system (with a four-way valve and a condenser as a tank heat exchanger) provided by an embodiment of the present application;

FIG. 4 is a cross-sectional view of a first tank heat exchanger provided by an embodiment of the present application;

FIG. 5 is a cross-sectional view of a second tank heat exchanger provided by an embodiment of the present application;

FIG. 6 is a cross-sectional view of a third tank heat exchanger provided in an embodiment of the present application;

FIG. 7 is a schematic partial structural view of a fourth tank heat exchanger provided in an embodiment of the present application;

FIG. 8 is a cross-sectional view of a fifth tank heat exchanger provided in an embodiment of the present application;

FIG. 9 is a cross-sectional view of a sixth can heat exchanger provided by an embodiment of the present application;

FIG. 10 is a cross-sectional view of a seventh can heat exchanger provided by an embodiment of the present application;

fig. 11 is a sectional view of an eighth can heat exchanger provided in an embodiment of the present application.

Icon: 10-can heat exchanger; 20-a compressor; 30-a heat exchanger; 31-a condenser; 40-an expansion valve; a 50-four-way valve; 60-a gas-liquid separator; 70-low pressure valve; 80-a high pressure valve; 90-water pump; 100-outer cylinder; 110-a leg; 120-the top wall of the outer cylinder; 130-outer barrel side wall; 140-the bottom wall of the outer barrel; 200-an inner cylinder; 210-spray holes; 220-communicating hole; 230-an upper chamber; 240-lower chamber; 250-a one-way valve; 251-a body; 2511-flow through holes; 252-a floating baffle; 253-a stop; 260-a first cartridge portion; 261-a first barrel bottom wall; 262-a first cartridge side wall; 270-a second cartridge portion; 300-heat exchange tube; 310-water inlet end; 320-water outlet end; 400-liquid tube; 410-a bypass branch; 420-a control valve; 430-a bypass orifice; 500-trachea; 600-an oil return pipe; 700-user terminal; 1000-heat pump system.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the embodiments of the present application, it is to be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like, refer to the orientation or positional relationship as shown in the drawings, or as conventionally placed in use of the product of the application, or as conventionally understood by those skilled in the art, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be considered as limiting the present application.

Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The heat exchanger is a device for transferring part of heat of hot fluid to cold fluid, and is also called as a heat exchanger. The heat exchanger plays an important role in chemical industry, petroleum industry, power industry, food industry and other industrial production, can be used as a heater, a cooler, a condenser, an evaporator, a reboiler and the like in chemical industry production, and is widely applied.

The heat exchanger has various forms such as a can type heat exchanger, a shell and tube type heat exchanger, and the like. Wherein, the tank type heat exchanger is a tank type heat exchanger, also called high-efficiency tank. When the tank type heat exchanger is used as a condenser, compared with a shell and tube type heat exchanger, the tank type heat exchanger has the advantages of small volume and high heat exchange efficiency. But when the evaporator is used as an evaporator, the heat exchange efficiency is low.

The working principle of the tank-type heat exchanger is that a refrigerant is taken away from a tank body, a medium to be subjected to heat exchange, such as water, is taken away from a heat exchange pipe, and the medium to be subjected to heat exchange is subjected to heat exchange through the refrigerant, so that the temperature of the medium to be subjected to heat exchange is increased or reduced. When the medium to be heat exchanged is water, the tank heat exchanger is used for heating or cooling the water. The applicant found that: when the tank heat exchanger is used as an evaporator, the refrigerant is concentrated at the bottom of the tank, occupying about 1/5 of the tank volume. In other words, only the heat exchange tubes close to the bottom of the tank body can be soaked in the refrigerant to exchange heat with the refrigerant, and most of the heat exchange tubes are not in contact with the refrigerant and cannot exchange heat with the refrigerant. The heat exchange tubes which are not soaked in the refrigerant are dry to form a main tube. The part of the heat exchange tube which is not immersed by the liquid refrigerant is taken as a main tube area, and the heat exchange efficiency of the main tube area is lower. In short, the applicant found that when the tank type heat exchanger is used as an evaporator, the refrigerant thereof cannot sufficiently cover the heat exchange tubes, resulting in a low heat exchange efficiency when the tank type heat exchanger is used as an evaporator.

Based on the above consideration, in order to solve the problem that the heat exchange pipe cannot be sufficiently covered by the refrigerant when the tank heat exchanger is used as an evaporator, the applicant has designed a tank heat exchanger through intensive research. The tank type heat exchanger comprises an outer cylinder, an inner cylinder, a heat exchange tube, a liquid tube and an air tube. The inner cylinder is arranged in the outer cylinder. The heat exchange tube is arranged between the inner barrel and the outer barrel and is spirally wound outside the inner barrel. The liquid pipe extends into the inner cylinder and is used for supplying liquid refrigerant to the inner cylinder or sucking the liquid refrigerant from the inner cylinder. The air pipe is arranged on the outer cylinder and used for sucking gaseous refrigerants from between the inner cylinder and the outer cylinder or providing the gaseous refrigerants to between the inner cylinder and the outer cylinder. Wherein, the inner cylinder is provided with a spraying hole, and the spraying hole is used for spraying the liquid refrigerant in the inner cylinder to the heat exchange tube to reduce the main pipe area of the heat exchange tube. When this pot-type heat exchanger is used as the evaporimeter, provide liquid refrigerant through liquid pipe to the inner tube for liquid refrigerant rises gradually at the liquid level of inner tube, when the liquid level reached the position that sprays the hole place, liquid refrigerant spout from spraying the hole, and spray to the heat exchange tube, forms the liquid film on the surface of heat exchange tube, so that liquid refrigerant carries out the heat exchange with the fluid in the heat exchange tube, reduces the dry tube district of heat exchange tube, promotes heat exchange efficiency. When the tank type heat exchanger is used as an evaporator, the liquid refrigerant can fully cover the heat exchange tube, and the heat exchange efficiency is higher.

The tank heat exchanger disclosed by the embodiment of the application can be used in industrial production such as petroleum, chemical engineering, light industry, pharmacy and energy, low-temperature fluid is heated or high-temperature fluid is cooled, and liquid is vaporized into steam or the steam is condensed into liquid. The tank heat exchanger can be used as a unit device such as a heater, a cooler, a condenser and the like, and can also be a component of a certain process device such as a heat exchanger in an ammonia synthesis tower. Commonly, the tank type heat exchanger can be used as a heating or cooling unit of a floor heating system, an air disc, an air conditioner and a water heater. The tank heat exchanger may also function as an evaporator or condenser for the heat pump system.

The following embodiments are described taking a heat pump system as an example.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a heat pump system 1000 according to the present embodiment. The heat pump system 1000 includes a compressor 20, a condenser 31, an expansion valve 40, and a tank heat exchanger 10. Wherein, the outlet of the compressor 20 is communicated with the inlet of the condenser 31, the outlet of the condenser 31 is communicated with the tank type heat exchanger 10 through the expansion valve 40, and the tank type heat exchanger 10 is communicated with the inlet of the compressor 20. In this embodiment, the tank heat exchanger 10 functions as an evaporator. The low-temperature low-pressure gaseous refrigerant is compressed by the compressor 20, is converted into a high-temperature high-pressure gaseous refrigerant, flows to the condenser 31 from the outlet of the compressor 20, releases heat in the condenser 31, is converted into a medium-temperature high-pressure gas refrigerant, then the medium-temperature high-pressure gaseous refrigerant enters the expansion valve 40 and is converted into a liquid refrigerant, the liquid refrigerant enters the tank heat exchanger 10, exchanges heat with a medium to be heated, cools the medium to be heated, and the medium to be heated flows to the user terminal 700 after being cooled for use. The user terminal 700 may be an air conditioner, and the cold water in the tank heat exchanger 10 is introduced into the air conditioner to exchange heat with the indoor air to provide cold air. A water pump 90 is provided between the user terminal 700 and the tank heat exchanger 10 to pump the cold water in the tank heat exchanger 10 into the air conditioner. After passing through the tank heat exchanger 10, the liquid refrigerant is converted into a low-temperature and low-pressure gaseous refrigerant, and then returns to the compressor 20.

In some embodiments, a low pressure valve 70 is provided between the compressor 20 and the tank heat exchanger 10 to monitor the system pressure, which is too low to shut down the compressor 20 for protection. It should be appreciated that when a too low pressure is detected, the compressor 20 and the tank heat exchanger 10 are disconnected, i.e., the compressor 20 is shut down for protection. When the pressure is detected to be normal, the compressor 20 is communicated with the tank heat exchanger 10, and the low-temperature and low-pressure gaseous refrigerant discharged from the tank heat exchanger 10 can enter the compressor 20.

In some embodiments, a high pressure valve 80 is provided between the compressor 20 and the condenser 31 to monitor system pressure, and excessive pressure causes shutdown protection of the compressor 20. It should be appreciated that when excessive pressure is detected, the compressor 20 and condenser 31 are disconnected and the compressor 20 is shut down for protection. When the pressure is detected to be normal, the compressor 20 is communicated with the condenser 31, and the high-temperature and high-pressure gaseous refrigerant discharged from the tank heat exchanger 10 can enter the condenser 31.

In some embodiments, the tank heat exchanger 10 communicates with the inlet of the compressor 20 through a gas-liquid separator 60. The gas-liquid separator 60 is used to separate liquid mixed in low-temperature and low-pressure gaseous refrigerant discharged from the tank heat exchanger 10, such as liquid refrigerant and/or lubricating oil contained in the gaseous refrigerant. In addition, the tank type heat exchanger 10 has a special oil return pipe 600, and the oil return pipe 600 communicates with the gas-liquid separator 60.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a heat pump system 1000 (having a four-way valve 50, and a tank heat exchanger 10 being an evaporator) according to the present embodiment. The heat pump system 1000 includes a compressor 20, a heat exchanger 30, an expansion valve 40, a four-way valve 50, and a tank heat exchanger 10. Wherein, the inlet of the compressor 20, the heat exchanger 30, the can type heat exchanger 10 and the outlet of the compressor 20 are communicated through the four-way valve 50. The condenser 31 communicates with the tank heat exchanger 10 through an expansion valve 40. Referring to fig. 2, the tank heat exchanger 10 serves as an evaporator and the heat exchanger 30 serves as a condenser, and at this time, the four-way valve 50 communicates an outlet of the compressor 20 with an inlet of the heat exchanger 30 and communicates an inlet of the compressor 20 with the tank heat exchanger 10. The flow of the refrigerant in the heat pump system 1000 is as follows: the low-temperature low-pressure gaseous refrigerant is compressed by the compressor 20, is converted into a high-temperature high-pressure gaseous refrigerant, flows to the heat exchanger 30 from an outlet of the compressor 20, releases heat in the heat exchanger 30, is converted into a medium-temperature high-pressure gas refrigerant, then the medium-temperature high-pressure gaseous refrigerant enters the expansion valve 40 and is converted into a liquid refrigerant, the liquid refrigerant enters the tank type heat exchanger 10, exchanges heat with a medium to be heated, cools the medium to be heated, and the medium to be heated flows to the user terminal 700 after being cooled for use. The user terminal 700 may be an air conditioner, and the cold water in the tank heat exchanger 10 is introduced into the air conditioner to exchange heat with the indoor air to provide cold air. A water pump 90 is provided between the user terminal 700 and the tank heat exchanger 10 to pump the cold water in the tank heat exchanger 10 into the air conditioner. After passing through the tank heat exchanger 10, the liquid refrigerant is converted into a low-temperature and low-pressure gaseous refrigerant, and then returns to the compressor 20.

In some embodiments, a low pressure valve 70 is provided between the inlet of the compressor 20 and the four-way valve 50 to monitor the system pressure, which is too low to shut down the compressor 20 for protection. It should be appreciated that when too low a pressure is detected, the compressor 20 and four-way valve 50 are disconnected, i.e., the compressor 20 is shut down for protection. When the pressure is detected to be normal, the compressor 20 is communicated with the four-way valve 50, that is, the compressor 20 is communicated with the tank heat exchanger 10, and the low-temperature and low-pressure gaseous refrigerant discharged from the tank heat exchanger 10 can enter the compressor 20.

In some embodiments, the four-way valve 50 is in communication with an inlet of the compressor 20 through a gas-liquid separator 60, and the low pressure valve 70 is disposed between the compressor 20 and the gas-liquid separator 60. That is, the tank heat exchanger 10 is communicated with the inlet of the compressor 20 through the gas-liquid separator 60, and the gas-liquid separator 60 is used for separating liquid mixed in low-temperature and low-pressure gaseous refrigerant discharged from the tank heat exchanger 10, such as liquid refrigerant and/or lubricating oil contained in the gaseous refrigerant. In addition, the tank type heat exchanger 10 has a special oil return pipe 600, and the oil return pipe 600 communicates with the gas-liquid separator 60.

In some embodiments, a high pressure valve 80 is provided between the outlet of the compressor 20 and the four-way valve 50 to monitor system pressure, which causes shutdown protection of the compressor 20. It should be appreciated that when excessive pressure is detected, the outlet of the compressor 20 and the four-way valve 50 are disconnected, i.e., the compressor 20 is shut down for protection. When the pressure is detected to be normal, the outlet of the compressor 20 is communicated with the four-way valve 50, that is, the outlet of the compressor 20 is communicated with the heat exchanger 30, and the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 20 can enter the heat exchanger 30.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a heat pump system 1000 (having a four-way valve 50, and a tank heat exchanger 10 as a condenser) according to the present embodiment. At this time, the can type heat exchanger 10 serves as a condenser and the heat exchanger 30 serves as an evaporator, and at this time, the four-way valve 50 communicates the outlet of the compressor 20 with the can type heat exchanger 10 and communicates the inlet of the compressor 20 with the heat exchanger 30. The flow of the refrigerant in the heat pump system 1000 is as follows: the low-temperature low-pressure gaseous refrigerant is compressed by the compressor 20, is converted into a high-temperature high-pressure gaseous refrigerant, flows to the tank heat exchanger 10 from the outlet of the compressor 20, releases heat in the tank heat exchanger 10, exchanges heat with a medium to be heat exchanged, heats the medium to be heat exchanged, and flows to the user terminal 700 after the medium to be heat exchanged is cooled for use by a user. The user terminal 700 may be a water heater or a heating system, and hot water in the tank heat exchanger 10 is introduced into the water heater to supply domestic hot water to a user, or introduced into the heating system to exchange heat with indoor air to heat. A water pump 90 is provided between the user terminal 700 and the tank type heat exchanger 10 to pump the hot water in the tank type heat exchanger 10 into an air conditioner or a heating system. The high-temperature high-pressure gas refrigerant is converted into a high-temperature high-pressure liquid refrigerant through the tank heat exchanger 10, then the high-temperature high-pressure liquid refrigerant enters the expansion valve 40 and is converted into a low-temperature low-pressure liquid refrigerant, the low-temperature low-pressure liquid refrigerant enters the heat exchanger 30, and the liquid refrigerant is converted into a low-temperature low-pressure gas refrigerant through the heat exchanger 30 and returns to the compressor 20 again.

At this time, when the pressure is detected to be too low, the compressor 20 and the four-way valve 50 are disconnected, i.e., the compressor 20 is shut down for protection. When the pressure is detected to be normal, the compressor 20 is communicated with the four-way valve 50, that is, the compressor 20 is communicated with the heat exchanger 30, and the low-temperature and low-pressure gaseous refrigerant discharged from the heat exchanger 30 can enter the compressor 20. When excessive pressure is detected, the outlet of the compressor 20 and the four-way valve 50 are disconnected, i.e., the compressor 20 is shut down for protection. When the pressure is detected to be normal, the outlet of the compressor 20 is communicated with the four-way valve 50, that is, the outlet of the compressor 20 is communicated with the tank heat exchanger 10, and the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 20 can enter the tank heat exchanger 10. When the heat exchanger 30 is used as an evaporator, the heat exchanger 30 is communicated with an inlet of the compressor 20 through the gas-liquid separator 60, and the gas-liquid separator 60 is used for separating liquid mixed in low-temperature and low-pressure gaseous refrigerant discharged from the heat exchanger 30, such as liquid refrigerant and/or lubricating oil contained in the gaseous refrigerant.

Referring to fig. 4, fig. 4 is a sectional view of the first tank heat exchanger 10 according to the present embodiment. The present embodiment provides a can type heat exchanger 10, and the can type heat exchanger 10 includes an outer tub 100, an inner tub 200, a heat exchange pipe 300, a liquid pipe 400, and a gas pipe 500. The inner cylinder 200 is disposed in the outer cylinder 100. The heat exchange pipe 300 is disposed between the inner tube 200 and the outer tube 100, and is spirally wound outside the inner tube 200. The liquid pipe 400 extends into the inner tube 200 to supply liquid refrigerant to the inner tube 200 or to suck liquid refrigerant from the inner tube 200. The gas pipe 500 is provided to the outer tub 100, and is used to suck the gaseous refrigerant from between the inner tub 200 and the outer tub 100 or supply the gaseous refrigerant to between the inner tub 200 and the outer tub 100. The inner cylinder 200 is provided with spray holes 210, and the spray holes 210 are used for spraying the liquid refrigerant in the inner cylinder 200 to the heat exchange tube 300, so as to reduce the main tube area of the heat exchange tube 300. This can-type heat exchanger 10 is when being used as the evaporimeter, provides liquid refrigerant through liquid pipe 400 to inner tube 200 for liquid refrigerant rises gradually at the liquid level of inner tube 200, when the liquid level reached the position that sprays hole 210 place, liquid refrigerant is spout from spraying hole 210, and spray to the dry tube district of heat exchange tube 300, form the liquid film on the surface of heat exchange tube 300, so that liquid refrigerant carries out the heat exchange with the fluid in the heat exchange tube 300, reduce the dry tube district of heat exchange tube 300, promote heat exchange efficiency.

Referring to fig. 4, the outer tub 100 is a tubular structure, and both ends of the outer tub 100 are closed to form a closed space, thereby improving heat exchange efficiency. The bottom of the tub 100 is provided with legs 110, and the legs 110 are used to contact the ground, supporting the entire tank type heat exchanger 10, so as to reduce the risk of damage to the tub 100 caused by the direct contact of the tub 100 with the ground. The specific shape of the outer tub 100 is not limited, and for example, the outer tub 100 may have a cylindrical structure or a square-tube structure. Specifically, the outer tub 100 includes an outer tub top wall 120, an outer tub side wall 130, and an outer tub bottom wall 140, the outer tub side wall 130 enclosing a cylindrical structure, the outer tub top wall 120 and the outer tub bottom wall 140 respectively closing both ends of the outer tub side wall 130. In other words, the outer tub top wall 120 and the outer tub bottom wall 140 are oppositely disposed, and the outer tub side wall 130 connects the outer tub top wall 120 and the outer tub bottom wall 140. Here, the outer tub side wall 130 refers to an outer wall of the outer tub 100 parallel to the axial direction of the outer tub 100, and the outer tub top wall 120 and the outer tub bottom wall 140 are both outer walls of the outer tub 100 perpendicular to the axial direction of the outer tub 100, and the outer tub top wall 120 and the outer tub bottom wall 140 are oppositely disposed in the axial direction of the outer tub 100.

The heat exchange pipe 300 is used for passing a medium to be heat-exchanged, such as water. The heat exchange pipe 300 is spirally wound around the outer wall of the inner tube 200. The heat exchange tube 300 has two ends extending out of the outer tube 100, wherein one end is a water inlet end 310 and the other end is a water outlet end 320. Alternatively, the water inlet end 310 is near the bottom of the tank heat exchanger 10 and the water outlet end 320 is near the top of the tank heat exchanger 10.

The liquid pipe 400 is extended into the inner tube 200, and the liquid pipe 400 is used to supply liquid refrigerant into the inner tube 200 when the can type heat exchanger 10 is used as an evaporator. When the tank heat exchanger 10 is used as the condenser 31, the liquid pipe 400 is used to draw the liquid refrigerant from the inner tube 200. In this embodiment, the liquid pipe 400 is near the bottom of the inner tube 200 to facilitate the suction of the refrigerant from the inner tube 200.

The air pipe 500 is provided on the outer tub 100, and when the can type heat exchanger 10 is used as an evaporator, the air pipe 500 serves to suck a gaseous refrigerant from between the inner tub 200 and the outer tub 100. When the tank type heat exchanger 10 is used as the condenser 31, the gas pipe 500 is used to supply a gaseous refrigerant between the inner tub 200 and the outer tub 100.

Referring to fig. 4, the can type heat exchanger 10 further includes an oil return pipe 600, and the oil return pipe 600 is connected to the outer tub 100 for sucking the lubricating oil between the inner tub 200 and the outer tub 100. Since the amount of the lubricating oil is not large, the oil return pipe 600 is disposed near the bottom of the can type heat exchanger 10 so as to draw out the lubricating oil. The oil return pipe 600 is used to communicate with the gas-liquid separator 60 to recover the lubricating oil.

The inner cylinder 200 is disposed in the outer cylinder 100, the inner cylinder 200 is a cylindrical structure, and both ends of the inner cylinder 200 are closed. In some embodiments, the inner cylinder 200 is connected at both ends to the outer cylinder top wall 120 and the outer cylinder bottom wall 140, respectively, to form a closed space. The specific shape of the inner cylinder 200 is not limited, and for example, the outer cylinder 100 may have a cylindrical structure or a square cylindrical structure. The wall surface of the inner cylinder 200 is provided with spray holes 210, and the spray holes 210 are used for spraying the liquid refrigerant in the inner cylinder 200 to the heat exchange tube 300 so as to reduce the main tube area of the heat exchange tube 300. As mentioned above, the main tube region refers to the portion of the heat exchange tube 300 that is not submerged by the liquid refrigerant. In this embodiment, the liquid refrigerant may be sprayed to the heat exchange tube 300 through the spraying holes 210, so that the liquid refrigerant covers the dry tube region, thereby improving the heat exchange efficiency.

Referring to fig. 4, in the present embodiment, the spray holes 210 are located at the middle of the inner tube 200 in the height direction (X direction shown in fig. 4) of the can type heat exchanger 10. It can also be understood that the spray holes 210 are located at the middle position of the outer tub 100 in the height direction (X direction as shown in fig. 4) of the can type heat exchanger 10. By arranging the spraying holes 210 at the middle part of the inner cylinder 200, the liquid refrigerant sprayed from the spraying holes 210 can be sprayed to the heat exchange tube 300, the liquid refrigerant has a small height required to rise at the liquid level of the inner cylinder 200, and the time required for the liquid refrigerant to reach the height of the spraying holes 210 (the liquid refrigerant is sprayed from the spraying holes 210) from the liquid pipe 400 to the liquid level of the liquid refrigerant is short, so that the rapid spraying is realized.

In some embodiments, the spray holes 210 are located at an upper portion of the inner drum 200 in a height direction of the can type heat exchanger 10. It can also be understood that the spray holes 210 are located at an upper position of the outer tub 100 in the height direction of the can type heat exchanger 10. Thus, the area of the liquid refrigerant sprayed from the spraying holes 210, which can cover the heat exchange tube 300, is large, the spraying effect is good, and the heat exchange efficiency is high.

In the present embodiment, the spray holes 210 are provided in plurality, and the plurality of spray holes 210 are distributed along the circumferential direction of the inner cylinder 200. By forming the plurality of spraying holes 210 in the circumferential direction of the inner tube 200, the liquid refrigerant can be sprayed to the heat exchange tube 300 from the plurality of spraying holes 210 at the same time, so that the liquid refrigerant is attached to the surface of the heat exchange tube 300 as much as possible, the contact area between the liquid refrigerant and the heat exchange tube 300 is increased, and the heat exchange efficiency of the can-type heat exchanger 10 is improved. Optionally, the plurality of spraying holes 210 are uniformly distributed in the circumferential direction of the inner barrel 200, so that the spraying uniformity is better, the liquid refrigerant can cover the heat exchange tube 300, and the heat exchange efficiency is improved. In addition, the plurality of spray holes 210 are formed along the circumferential direction of the inner tube 200, so that the liquid refrigerant can be uniformly sprayed to the heat exchange tube 300.

In the present embodiment, referring to fig. 4, the lower end of the inner cylinder 200 is provided with a communication hole 220, and the communication hole 220 communicates the inner cylinder 200 and the outer cylinder 100. The aperture of the communication hole 220 is small so that a part of the liquid refrigerant flows out of the inner cylinder 200 through the communication hole 220 and enters between the inner cylinder 200 and the outer cylinder 100, and the other part of the liquid refrigerant remains in the inner cylinder 200. Further, the communication hole 220 generates pressure loss such that the liquid level inside the inner cylinder 200 is higher than the liquid level outside the inner cylinder 200. When the liquid level in the inner cylinder 200 reaches the height of the spray holes 210, the liquid refrigerant in the inner cylinder 200 is sprayed to the heat exchange pipe 300 through the spray holes 210. As for the specific value of the aperture of the communication hole 220, it can be determined according to the flow rate of the liquid refrigerant supplied when the heat pump system 1000 is in use. It is sufficient if the amount of the liquid refrigerant remaining in the inner cylinder 200 is greater than the amount of the liquid refrigerant flowing out of the inner cylinder 200 through the communication hole 220.

The presence of the communication hole 220 causes the air pressure inside the inner cylinder 200 to be greater than the air pressure outside the inner cylinder 200, so that the liquid refrigerant is more easily sprayed outside the inner cylinder 200. In addition, the liquid refrigerant which firstly enters between the inner cylinder 200 and the outer cylinder 100 through the communication hole 220 exchanges heat with the heat exchange tube 300, so that the problem that heat cannot be exchanged before the liquid level in the inner cylinder 200 does not reach the height of the spraying hole 210 is relieved to a certain extent. More importantly, the liquid refrigerant which enters the space between the inner cylinder 200 and the outer cylinder 100 through the communicating hole 220 exchanges heat with the heat exchange tube 300 firstly, the liquid refrigerant can be gasified into a gaseous refrigerant, the gaseous refrigerant moves upwards to drive the liquid refrigerant sprayed out of the spraying hole 210 to move upwards, so that the liquid refrigerant is attached to the heat exchange tube 300 above the spraying hole 210, a liquid film is formed, the heat exchange is carried out with the heat exchange tube 300 above the spraying hole 210, and the heat exchange efficiency of the tank-type heat exchanger 10 is improved.

In some embodiments, the communication hole 220 is provided in plurality, and the plurality of spray holes 210 are distributed along the circumferential direction of the inner cylinder 200. It should be noted that the amount of liquid refrigerant remaining in the inner tube 200 should be greater than the total amount of liquid refrigerant flowing out of the inner tube 200 through the plurality of communication holes 220.

Referring to fig. 5, fig. 5 is a sectional view of a second tank heat exchanger 10 according to an embodiment of the present invention. The second tank heat exchanger 10 has substantially the same structure as the first tank heat exchanger 10 described above. The difference is that the air pipe 500 of the first tank type heat exchanger 10 is arranged on the side wall 130 of the outer cylinder, and the air pipe 500 of the second tank type heat exchanger 10 is arranged on the top wall 120 of the outer cylinder.

Referring to fig. 6, fig. 6 is a sectional view of a third tank heat exchanger 10 according to an embodiment of the present invention. The third tank heat exchanger 10 has substantially the same structure as the first tank heat exchanger 10 described above. The difference is that the third tank heat exchanger 10 further includes a check valve 250, and the check valve 250 is disposed in the inner cylinder 200. The check valve 250 partitions the inner space of the inner cylinder 200 into an upper chamber 230 and a lower chamber 240, the shower holes 210 are opened in the wall surface of the upper chamber 230, and the communication holes 220 are opened in the wall surface of the lower chamber 240. One end of the liquid pipe 400 extends into the lower chamber 240 to supply liquid refrigerant to the lower chamber 240. The check valve 250 is configured to allow refrigerant to enter the upper chamber 230 from the lower chamber 240 and to prevent refrigerant from entering the lower chamber 240 from the upper chamber 230. When the can heat exchanger 10 is used as an evaporator by providing the check valve 250, the liquid pipe 400 supplies a liquid refrigerant to the lower chamber 240, a part of the liquid refrigerant enters between the inner tube 200 and the outer tube 100 through the communication hole 220, and the other part of the liquid refrigerant remains in the lower chamber 240. The liquid level of the liquid refrigerant in the lower chamber 240 gradually rises and reaches the position of the check valve 250, and at this time, the check valve 250 opens to allow the liquid refrigerant in the lower chamber 240 to enter the upper chamber 230. The liquid level of the liquid refrigerant in the upper chamber 230 gradually rises until the liquid level reaches the position of the spray holes 210, and the liquid refrigerant in the upper chamber 230 is sprayed out of the spray holes 210 and sprayed onto the heat exchange tube 300. After the liquid refrigerant exchanges heat with the heat exchange tube 300, the liquid refrigerant is changed into a gaseous refrigerant and discharged from the gas tube 500. When the tank type heat exchanger 10 is used as a condenser, the gas pipe 500 supplies the gaseous refrigerant between the inner cylinder 200 and the outer cylinder 100, a part of the gaseous refrigerant enters the upper chamber 230 from the spray holes 210, and the other part of the gaseous refrigerant is liquefied and then enters the lower chamber 240 from the communication hole 220, and the check valve 250 prevents the refrigerant from entering the lower chamber 240 from the upper chamber 230, so that the gaseous refrigerant which has entered the upper chamber 230 and has not sufficiently performed heat exchange cannot be discharged out of the tank type heat exchanger 10. Only the refrigerant introduced into the lower chamber 240 through the communication hole 220 (since the communication hole 220 is located at the lower end of the inner tube 200, the refrigerant reaches the communication hole 220, heat exchange is sufficiently performed, and the gaseous refrigerant is liquefied into a liquid refrigerant), can be drawn out of the can type heat exchanger 10 by the liquid pipe 400.

Optionally, the check valve 250 is sleeved on the liquid tube 400, that is, the liquid tube 400 is inserted through the check valve 250. By adopting the arrangement, the structure is simple and compact, and the size of the tank type heat exchanger 10 is favorably reduced. In some embodiments, the liquid tube 400 extends from the sidewall of the inner barrel 200 into the lower chamber 240 to avoid the check valve 250.

Referring to fig. 7, fig. 7 is a partial structural schematic view of a fourth tank heat exchanger 10 according to an embodiment of the present invention. The fourth tank heat exchanger 10 has substantially the same structure as the third tank heat exchanger 10 described above. Except that, in the third tank heat exchanger 10, the lower end surface of the liquid pipe 400 is parallel to the horizontal plane. In the fourth tank heat exchanger 10, the lower end of the liquid pipe 400 (the end extending into the inner cylinder 200) is bent such that the lower end surface of the liquid pipe 400 has an angle with the horizontal plane. When the tank heat exchanger 10 is used as a condenser, the liquid pipe 400 sucks the liquid refrigerant from the inner tube 200. By forming the lower end surface of the liquid pipe 400 to have an angle with the horizontal plane, the lower end surface of the liquid pipe 400 has a certain area in the height direction (X direction as shown in fig. 7), which can allow the liquid level of the liquid refrigerant to change, and can reduce the possibility of pulse liquid suction during condensation. Wherein, the pulse imbibition means: when the liquid pipe 400 sucks the liquid refrigerant, due to the liquid level change of the liquid refrigerant, the situation that all air is sucked in a period of time, all the liquid refrigerant is sucked in a period of time, and the liquid refrigerant and the air are distributed in the liquid pipe 400 in a period of time can occur. For example, when the lower end surface of the liquid pipe 400 is parallel to the horizontal plane, if the liquid level of the liquid refrigerant is higher than the lower end surface of the liquid pipe 400, the liquid refrigerant is sucked by the liquid pipe 400. If the liquid level of the liquid refrigerant is lower than the lower end surface of the liquid pipe 400, the liquid pipe 400 cannot suck the liquid refrigerant, and only air can be sucked. A section of pure gas will be present in the liquid pipe 400, and in the case of a section of pure liquid, the phenomenon of pulsed imbibition will occur. When the lower end surface of the liquid pipe 400 has an angle with the horizontal plane, the liquid level may be allowed to vary within the height between the upper side of the lower end surface of the liquid pipe 400 and the lower side of the lower end surface of the liquid pipe 400. When the liquid level of the liquid refrigerant exceeds the upper side of the lower end surface of the liquid pipe 400, the liquid refrigerant is sucked from the liquid pipe 400. When the liquid level of the liquid refrigerant is located between the upper side of the lower end face of the liquid pipe 400 and the lower side of the lower end face of the liquid pipe 400, the liquid pipe 400 sucks a part of air and a part of liquid refrigerant, so that the situation of one section of pure gas and one section of pure liquid cannot occur, and the possibility of pulse liquid suction during condensation can be reduced.

Referring to fig. 7, in some embodiments, the check valve 250 includes a main body 251, a floating baffle 252 and a limiting member 253, wherein the main body 251 is welded to an outer wall of the liquid pipe 400 and an inner wall of the outer cylinder 100, a flow hole 2511 is formed in the main body 251, and the flow hole 2511 allows a refrigerant to pass through. The limiting member 253 is disposed opposite to the main body 251, the limiting member 253 is fixedly connected to the outer wall of the liquid tube 400 and the inner wall of the outer tube 100, and a through hole allowing the refrigerant to pass through is formed in the limiting member 253. The limiting member 253 may be formed by connecting a plurality of blocking posts. The limiting member 253 may be a baffle plate having a through hole. The floating barrier 252 is disposed between the stopper 253 and the body 251, and the floating barrier 252 blocks the flow hole 2511, so that the refrigerant cannot enter the lower chamber 240 from the upper chamber 230 or cannot enter the upper chamber 230 from the lower chamber 240 when the floating barrier 252 blocks the flow hole 2511. The floating baffle 252 is separated from the body 251 by buoyancy of the liquid refrigerant to open the circulation hole 2511, and when the circulation hole 2511 is opened, the liquid refrigerant of the lower chamber 240 can enter the upper chamber 230. The stopper 253 and the body 251 together limit the floating range of the floating barrier 252. Typically, the floating shield 252 will engage the body 251 under the force of gravity, shielding the flow through 2511.

Specifically, when the can type heat exchanger 10 is used as an evaporator, the liquid pipe 400 supplies a liquid refrigerant to the lower chamber 240, a part of the liquid refrigerant enters between the inner tube 200 and the outer tube 100 through the communication hole 220, and the other part of the liquid refrigerant remains in the lower chamber 240. The liquid level of the liquid refrigerant in the lower chamber 240 gradually rises and reaches the position of the floating baffle 252, at this time, the floating baffle 252 floats upwards under the buoyancy of the liquid refrigerant, the flow hole 2511 is not blocked, and the flow hole 2511 is opened to allow the liquid refrigerant in the lower chamber 240 to enter the upper chamber 230. The liquid level of the liquid refrigerant in the upper chamber 230 gradually rises until the liquid level reaches the position of the spray holes 210, and the liquid refrigerant in the upper chamber 230 is sprayed out of the spray holes 210 and sprayed onto the heat exchange tube 300. After the liquid refrigerant exchanges heat with the heat exchange tube 300, the liquid refrigerant is changed into a gaseous refrigerant and discharged from the gas tube 500. When the tank heat exchanger 10 is used as a condenser, the gas pipe 500 supplies the gaseous refrigerant between the inner cylinder 200 and the outer cylinder 100, a part of the gaseous refrigerant enters the upper chamber 230 from the spray holes 210, and the other part of the gaseous refrigerant is liquefied and then enters the lower chamber 240 from the communication hole 220. since the floating baffle 252 has no buoyancy, i.e., the circulation hole 2511 is closed under the action of gravity, the refrigerant cannot enter the lower chamber 240 from the upper chamber 230, and therefore, the gaseous refrigerant which enters the upper chamber 230 and is not subjected to sufficient heat exchange cannot be discharged out of the tank heat exchanger 10. Only the refrigerant introduced into the lower chamber 240 through the communication hole 220 (since the communication hole 220 is located at the lower end of the inner tube 200, the refrigerant reaches the communication hole 220, heat exchange is sufficiently performed, and the gaseous refrigerant is liquefied into a liquid refrigerant), can be drawn out of the can type heat exchanger 10 by the liquid pipe 400.

In other embodiments, the floating baffle 252 is rotatably connected to the main body 251, and the floating baffle 252 can rotate relative to the main body 251 under the buoyancy of the liquid refrigerant to open the flow hole 2511. The limiting member 253 can limit the rotation angle of the floating baffle 252 to prevent the floating baffle 252 from rotating excessively and being unable to shelter the flow hole 2511 again under the action of gravity.

In still other embodiments, the check valve 250 includes a floating baffle 252, the floating baffle 252 is movably disposed on the inner tube 200 along an axial direction of the inner tube 200, and the floating baffle 252 does not allow the refrigerant to enter from a lower side of the floating baffle 252 to an upper side of the floating baffle 252. The spray holes 210 are located within the floating range of the floating barrier 252. Specifically, when the can type heat exchanger 10 is used as an evaporator, the liquid pipe 400 supplies a liquid refrigerant to the lower chamber 240, a part of the liquid refrigerant enters between the inner tube 200 and the outer tube 100 through the communication hole 220, and the other part of the liquid refrigerant remains in the lower chamber 240. The liquid level of the liquid refrigerant in the lower chamber 240 gradually rises and reaches the position of the floating baffle 252, at this time, the floating baffle 252 floats upwards under the buoyancy of the liquid refrigerant, so that the floating baffle 252 floats from the position lower than the spray holes 210 to the position higher than the spray holes 210, and when the liquid level of the liquid refrigerant reaches the height of the spray holes 210, the liquid refrigerant is sprayed out of the spray holes 210 and sprayed onto the heat exchange tube 300. After the liquid refrigerant exchanges heat with the heat exchange tube 300, the liquid refrigerant is changed into a gaseous refrigerant and discharged from the gas tube 500. When the tank type heat exchanger 10 is used as a condenser, the gas pipe 500 supplies the gaseous refrigerant between the inner cylinder 200 and the outer cylinder 100, a part of the gaseous refrigerant enters the upper chamber 230 from the spray holes 210, and the other part of the gaseous refrigerant is liquefied and then enters the lower chamber 240 from the communication hole 220. Only the refrigerant introduced into the lower chamber 240 through the communication hole 220 (since the communication hole 220 is located at the lower end of the inner tube 200, the refrigerant reaches the communication hole 220, heat exchange is sufficiently performed, and the gaseous refrigerant is liquefied into a liquid refrigerant), can be drawn out of the can type heat exchanger 10 by the liquid pipe 400.

Referring to fig. 8, fig. 8 is a cross-sectional view of a fifth tank heat exchanger 10 according to an embodiment of the present invention. The fifth tank heat exchanger 10 has substantially the same structure as the first tank heat exchanger 10 described above. The fifth can-type heat exchanger 10 is different in that the inner tube 200 includes a first tube 260 and a second tube 270, and the first tube 260 is connected to the second tube 270. The internal space of the first cylindrical portion 260 and the internal space of the second cylindrical portion 270 are independent of each other. The shower hole 210 is opened in the first cylindrical portion 260, and the communication hole 220 is opened in the second cylindrical portion 270. The liquid pipe 400 is configured to supply a part of the liquid refrigerant into the first cylinder 260 and another part of the liquid refrigerant into the second cylinder 270.

The first tube part 260 and the second tube part 270 are provided to make the inner space of the first tube part 260 and the inner space of the second tube part 270 independent from each other, the first tube part 260 is provided with the spray holes 210, the second tube part 270 is provided with the communication holes 220, the liquid refrigerant supplied from the liquid tube 400 to the first tube part 260 is sprayed to the heat exchange tube 300 from the spray holes 210 provided to the first tube part 260, the liquid refrigerant supplied from the liquid tube 400 to the second tube part 270 enters between the inner tube 200 and the outer tube 100 from the communication holes 220 provided to the second tube part 270 and contacts with the heat exchange tube 300 for heat exchange, and after the liquid refrigerant is gasified into the gas refrigerant, the liquid refrigerant sprayed from the spray holes 210 is further driven to move upwards, so that the liquid refrigerant is attached to and exchanges heat with the heat exchange tube 300 above the spray holes 210. In some embodiments, the first canister portion 260 is located above the second canister portion 270. The outer tub 100 includes an outer tub top wall 120, an outer tub side wall 130, and an outer tub bottom wall 140, and the upper end of the first tub 260 is closed by the outer tub top wall 120, and the lower end of the second tub 270 is closed by the outer tub bottom wall 140. The first barrel 260 includes a first barrel bottom wall 261 and a first barrel side wall 262, and an end of the first barrel side wall 262 remote from the first barrel bottom wall 261 is closed by the outer barrel top wall 120. The upper end of the second cylinder portion 270 is closed by the first cylinder portion bottom wall 261. One end of the liquid pipe 400 passes through the bottom wall 261 of the first cylinder and extends into the second cylinder 270. The upper end of the first tube 260 is closed by the outer tube top wall 120, so that the refrigerant can enter and exit the first tube 260 only from the shower holes 210. The upper end of the second tube 270 is closed by the first tube bottom wall 261, and the lower end of the second tube 270 is closed by the outer tube bottom wall 140, so that the refrigerant can enter and exit the second tube 270 only from the communication hole 220. Further, the upper end of the first cylindrical portion 260 is connected to the outer cylinder top wall 120, the lower end of the second cylindrical portion 270 is connected to the outer cylinder bottom wall 140, and the first cylindrical portion 260 is connected to the second cylindrical portion 270, thereby increasing the connection stability between the inner cylinder 200 and the outer cylinder 100. By sealing the upper end of the second cylinder portion 270 with the first cylinder portion bottom wall 261, the first cylinder portion bottom wall 261 functions as a partition to partition the internal space of the second cylinder portion 270 from the internal space of the first cylinder portion 260, so that the liquid refrigerant supplied from the liquid pipe 400 into the first cylinder portion 260 is sprayed from the spray holes 210 provided in the first cylinder portion 260 to the heat exchange pipe 300, and the liquid refrigerant supplied from the liquid pipe 400 into the second cylinder portion 270 enters between the inner cylinder 200 and the outer cylinder 100 from the communication holes 220 provided in the second cylinder portion 270.

Referring to fig. 8, one end of the liquid pipe 400 extends into the second cylinder 270, and a bypass hole 430 is formed in a pipe wall of the liquid pipe 400, and the bypass hole 430 is communicated with an inner wall space of the first cylinder 260. Specifically, the liquid pipe 400 penetrates the first tube 260 from the upper end of the first tube 260, and extends into the second tube 270 through the first tube bottom wall 261, and the bypass hole 430 opens in the portion of the liquid pipe 400 located in the first tube 260. Optionally, the bypass aperture 430 is near the top of the first cartridge portion 260. The number of the bypass holes 430 may be one or more, and is not limited thereto. When the number of the bypass holes 430 is plural, they may be formed along the longitudinal direction of the liquid pipe 400, or may be formed along the radial direction of the liquid pipe 400.

The tank heat exchanger 10 further includes a control valve (not shown in fig. 8) provided at the bypass hole 430 for controlling the liquid pipe 400 to be communicated with or disconnected from the inner space of the first barrel 260.

By providing the control valve, when the can-type heat exchanger 10 is used as an evaporator, the liquid refrigerant supplied from the liquid pipe 400 into the first tube 260 is sprayed to the heat exchange tube 300 through the spray hole 210 formed in the first tube 260, the liquid refrigerant supplied from the liquid pipe 400 into the second tube 270 enters between the inner tube 200 and the outer tube 100 through the communication hole 220 formed in the second tube 270, and contacts with the heat exchange tube 300 to exchange heat, and the liquid refrigerant is gasified into a gaseous refrigerant, and then further drives the liquid refrigerant sprayed from the spray hole 210 to move upwards, so that the liquid refrigerant is attached to the heat exchange tube 300 above the spray hole 210 and exchanges heat with the liquid refrigerant. After the liquid refrigerant exchanges heat with the heat exchange tube 300, the liquid refrigerant is changed into a gaseous refrigerant and discharged from the gas tube 500. When the tank heat exchanger 10 is used as a condenser, the control valve 420 is closed to prevent the refrigerant from being discharged through the bypass hole 430. The gas refrigerant is supplied between the inner tube 200 and the outer tube 100 through the gas pipe 500, a part of the gas refrigerant enters the first tube 260 through the shower holes 210, and the other part of the gas refrigerant is liquefied and enters the second tube 270 through the communication hole 220, and the refrigerant is prevented from being discharged through the bypass hole 430 by the control valve 420, so that the gas refrigerant entering the first tube 260 and not sufficiently heat-exchanged cannot be discharged out of the can type heat exchanger 10. Only the refrigerant introduced into the second cylinder 270 through the communication hole 220 (since the communication hole 220 is located at the lower end of the inner tube 200, the refrigerant reaches the communication hole 220, heat exchange is sufficiently performed, and the gaseous refrigerant is liquefied into a liquid refrigerant), the liquid pipe 400 can draw the can heat exchanger 10.

Referring to fig. 8, in the present embodiment, the cross-sectional area of the first cylinder portion 260 is larger than that of the second cylinder portion 270. When the inner cylinder 200 is a cylinder, it can be understood that the inner diameter of the first cylinder 260 is larger than the inner diameter of the second cylinder 270. When the inner cylinder 200 is a square cylinder, it can be understood that the side length of the first cylinder 260 is greater than the side length of the second cylinder 270. The cross-sectional area of the first cylinder 260 is larger, so that the spray holes 210 are closer to the heat exchange tube 300, and more spray holes 210 can be formed in the wall surface of the first cylinder 260, thereby improving the spray efficiency. If the distance from the communication hole 220 to the bottom wall of the second tube 270 is less than or equal to the distance from the shower hole 210 to the bottom wall of the first tube 260, the liquid refrigerant of the second tube 270 enters between the inner tube 200 and the outer tube 100 before the liquid refrigerant of the first tube 260. The liquid refrigerant of the second cylinder 270 enters between the inner cylinder 200 and the outer cylinder 100 to exchange heat with the heat exchange tube 300, and is transformed into a gaseous refrigerant, and the gaseous refrigerant moves upward to drive the liquid refrigerant sprayed from the first cylinder 260 to move upward and attach to the heat exchange tube 300 above the spray hole 210.

Referring to fig. 9, fig. 9 is a sectional view of a sixth tank heat exchanger 10 according to an embodiment of the present disclosure. The sixth tank heat exchanger 10 has substantially the same structure as the fifth tank heat exchanger 10 described above. The difference is that the air pipe 500 in the fifth tank type heat exchanger 10 is provided on the outer tub side wall 130, and the air pipe 500 in the sixth tank type heat exchanger 10 is provided on the outer tub top wall 120.

Referring to fig. 10, fig. 10 is a sectional view of a seventh tank heat exchanger 10 according to an embodiment of the present disclosure. The seventh tank heat exchanger 10 has substantially the same structure as the fifth tank heat exchanger 10 described above. The seventh can heat exchanger 10 is different in that the outer cylinder 100 includes an outer cylinder top wall 120, an outer cylinder side wall 130, and an outer cylinder bottom wall 140, the second cylinder 270 extends from a plane where the outer cylinder top wall 120 is located to the outer cylinder bottom wall 140 in the axial direction of the outer cylinder 100, and the first cylinder 260 is fitted over the second cylinder 270. The second cylinder 270 extends from the plane of the top wall 120 of the outer cylinder to the bottom wall 140 of the outer cylinder 100 along the axial direction, so that the space of the second cylinder 270 is large enough to temporarily store the liquid refrigerant when the flow rate of the liquid pipe 400 fluctuates. The first cylinder part 260 is sleeved on the second cylinder part 270, an annular chamber is formed between the first cylinder part 260 and the second cylinder part 270, and the cross-sectional area of the annular chamber is small, so that the liquid level in the first cylinder part 260 can be quickly raised, and then liquid refrigerants can be quickly sprayed out of the spraying holes 210. In addition, the upper end of the first tube portion 260 is closed by the outer tube top wall 120. The upper end of the first cylindrical part 260 is closed by the outer cylindrical top wall 120 so that the inner cylinder 200 is completely received in the outer cylindrical 100, and the tank type heat exchanger 10 has a small volume. One end of the liquid pipe 400 penetrates through the top wall 120 of the outer cylinder to extend into the second cylinder portion 270, a bypass branch 410 is arranged on the wall of the liquid pipe 400, and the bypass branch 410 is communicated with the first cylinder portion 260. The liquid pipe 400 is extended into the second cylinder 270 to supply the liquid refrigerant to the second cylinder 270. The bypass branch 410 is provided at the liquid pipe 400, so that the liquid refrigerant is supplied to the first cylinder 260.

The tank heat exchanger 10 further includes a control valve 420, the control valve 420 being provided on the bypass branch 410, the control valve 420 for controlling the connection or disconnection of the liquid pipe 400 with the inner space of the first barrel 260. By providing the control valve 420, when the can-type heat exchanger 10 is used as an evaporator, the liquid refrigerant supplied from the liquid pipe 400 to the first tube 260 is sprayed to the heat exchange pipe 300 through the spray hole 210 formed in the first tube 260, the liquid refrigerant supplied from the liquid pipe 400 to the second tube 270 enters between the inner tube 200 and the outer tube 100 through the communication hole 220 formed in the second tube 270, and contacts with the heat exchange pipe 300 to exchange heat, and the liquid refrigerant is gasified into a gaseous refrigerant, and then further drives the liquid refrigerant sprayed from the spray hole 210 to move upward, so that the liquid refrigerant is attached to the heat exchange pipe 300 above the spray hole 210 and exchanges heat with the liquid refrigerant. After the liquid refrigerant exchanges heat with the heat exchange tube 300, the liquid refrigerant is changed into a gaseous refrigerant and discharged from the gas tube 500. When the tank heat exchanger 10 is used as a condenser, the control valve 420 is closed to prevent the refrigerant from being discharged from the bypass branch 410. The gas pipe 500 supplies the gaseous refrigerant between the inner tube 200 and the outer tube 100, a part of the gaseous refrigerant enters the first tube 260 from the shower holes 210, and the other part of the gaseous refrigerant is liquefied and enters the second tube 270 from the communication hole 220, and the control valve 420 prevents the refrigerant from being discharged from the bypass passage 410, so that the gaseous refrigerant entering the first tube 260 and not sufficiently heat-exchanged cannot be discharged out of the tank heat exchanger 10. Only the refrigerant introduced into the second cylinder 270 through the communication hole 220 (since the communication hole 220 is located at the lower end of the inner tube 200, the refrigerant reaches the communication hole 220, heat exchange is sufficiently performed, and the gaseous refrigerant is liquefied into a liquid refrigerant), the liquid pipe 400 can draw the can heat exchanger 10.

Referring to fig. 11, fig. 11 is a sectional view of an eighth tank heat exchanger 10 according to the present embodiment. The eighth tank heat exchanger 10 has substantially the same structure as the seventh tank heat exchanger 10 described above. Except that, in the eighth can type heat exchanger 10, the upper end of the first tube part 260 protrudes out of the outer cylinder top wall 120. By extending the upper end of the first cylindrical portion 260 beyond the top wall 120 of the outer cylinder, the bypass 410 is easily provided in the first cylindrical portion 260, and the liquid pipe 400 is easily supplied to the first and second

cylindrical portions

260 and 270.

It is noted that, in some embodiments, the air pipe 500 is located above the shower holes 210 in a height direction (X direction as shown in fig. 11) of the can type heat exchanger 10. Through setting up the spray hole 210 in trachea 500's below for spray hole 210 can not spray liquid refrigerant on trachea 500 at the in-process that sprays, trachea 500 can not directly discharge the liquid refrigerant that does not carry out the heat transfer with heat exchange tube 300, thereby makes liquid refrigerant can carry out abundant heat transfer with heat exchange tube 300, improves the heat exchange efficiency of can-type heat exchanger 10.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A tank heat exchanger, comprising:

an outer tub (100);

an inner cylinder (200) provided in the outer cylinder (100);

a heat exchange tube (300) disposed between the inner tube (200) and the outer tube (100), and spirally wound outside the inner tube (200);

the liquid pipe (400) extends into the inner cylinder (200) and is used for supplying liquid refrigerant to the inner cylinder (200) or sucking the liquid refrigerant from the inner cylinder (200); and

an air pipe (500) provided in the outer tub (100) for sucking a gaseous refrigerant from between the inner tub (200) and the outer tub (100) or supplying a gaseous refrigerant to between the inner tub (200) and the outer tub (100);

the inner cylinder (200) is provided with spraying holes (210), and the spraying holes (210) are used for spraying the liquid refrigerant in the inner cylinder (200) to the heat exchange tube (300).

2. The tank heat exchanger according to claim 1, wherein the spray holes (210) are located at a middle portion of the inner drum (200) in a height direction of the tank heat exchanger (10).

3. The tank heat exchanger according to claim 1, wherein the spray holes (210) are provided in plurality, and the plurality of spray holes (210) are distributed along a circumferential direction of the inner cylinder (200).

4. The tank type heat exchanger according to any one of claims 1 to 3, wherein a communication hole (220) is opened at a lower end of the inner cylinder (200), and the communication hole (220) communicates the inner cylinder (200) and the outer cylinder (100).

5. The can type heat exchanger according to claim 4, wherein the can type heat exchanger (10) includes a check valve (250), the check valve (250) is disposed in the inner tube (200), the check valve (250) divides an inner space of the inner tube (200) into an upper chamber (230) and a lower chamber (240), the spray holes (210) are opened in a wall surface of the upper chamber (230), the communication holes (220) are opened in a wall surface of the lower chamber (240), one end of the liquid pipe (400) extends into the lower chamber (240) to supply the liquid refrigerant to the lower chamber (240), and the check valve (250) is configured to allow the refrigerant to enter the upper chamber (230) from the lower chamber (240) and to prevent the refrigerant from entering the lower chamber (240) from the upper chamber (230).

6. The tank heat exchanger according to claim 5, wherein the check valve (250) is sleeved on the liquid pipe (400).

7. The can type heat exchanger according to claim 4, wherein the inner tube (200) includes a first tube (260) and a second tube (270), the first tube (260) is connected to the second tube (270), an inner space of the first tube (260) and an inner space of the second tube (270) are independent from each other, the shower hole (210) is opened in the first tube (260), the communication hole (220) is opened in the second tube (270), and the liquid pipe (400) is configured to supply a part of liquid refrigerant into the first tube (260) and another part of liquid refrigerant into the second tube (270).

8. The can type heat exchanger according to claim 7, wherein one end of the liquid pipe (400) is protruded into the second drum part (270), and a bypass hole (430) or a bypass branch (410) is provided on a pipe wall of the liquid pipe (400), and the bypass hole (430) or the bypass branch (410) is communicated with the inner space of the first drum part (260).

9. The tank heat exchanger according to claim 8, characterized in that the tank heat exchanger (10) further comprises a control valve (420), the control valve (420) being provided at the bypass hole (430) or on the bypass branch (410), the control valve (420) being used for controlling the liquid pipe (400) to be communicated with or disconnected from the inner space of the first barrel (260).

10. The can heat exchanger according to claim 8, wherein the first drum (260) is located above the second drum (270), the outer tub (100) includes an outer tub top wall (120), an outer tub side wall (130), and an outer tub bottom wall (140), an upper end of the first drum (260) is closed by the outer tub top wall (120), a lower end of the second drum (270) is closed by the outer tub bottom wall (140), the first drum (260) includes a first drum bottom wall (261), an upper end of the second drum (270) is closed by the first drum bottom wall (261), and one end of the liquid pipe (400) passes through the first drum bottom wall (261) and protrudes into the second drum (270).

11. The can type heat exchanger according to claim 8, wherein the outer cylinder (100) comprises an outer cylinder top wall (120), an outer cylinder side wall (130) and an outer cylinder bottom wall (140), the second cylinder (270) extends from a plane where the outer cylinder top wall (120) is located to the outer cylinder bottom wall (140) along an axial direction of the outer cylinder (100), and the first cylinder (260) is sleeved on an upper portion of the second cylinder (270).

12. The can heat exchanger according to claim 11, wherein an upper end of the first drum (260) is closed by the outer drum top wall (120).

13. The can heat exchanger according to claim 11, wherein an upper end of the first drum portion (260) protrudes out of the outer drum top wall (120).

14. The can heat exchanger according to claim 7, wherein a cross-sectional area of the first drum portion (260) is larger than a cross-sectional area of the second drum portion (270).

15. The can type heat exchanger according to claim 1, wherein the lower end of the liquid pipe (400) is bent such that the lower end surface of the liquid pipe (400) has an angle with the horizontal plane.

16. The tank heat exchanger according to claim 1, wherein the air pipe (500) is located above the spray holes (210) in a height direction of the tank heat exchanger (10).

17. A heat pump system, characterized in that it comprises a tank heat exchanger (10) according to any one of claims 1-16.