CN113847827B

CN113847827B - Tank heat exchanger and heat pump system

Info

Publication number: CN113847827B
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: 2023-12-19
Anticipated expiration: 2041-10-22
Also published as: CN113847827A; WO2023066118A1

Abstract

The application provides a tank heat exchanger and heat pump system relates to the heat exchanger field. The tank 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 cylinder and the outer cylinder and spirally wound outside the inner cylinder. The liquid pipe is used for supplying liquid refrigerant to the inner cylinder or sucking liquid refrigerant from the inner cylinder. The air pipe is used for sucking the gaseous refrigerant from the inner cylinder and the outer cylinder or providing the gaseous refrigerant between the inner cylinder and the outer cylinder. Wherein, the inner tube has seted up the hole that sprays, sprays the hole and is used for spraying the liquid refrigerant in the inner tube to the heat exchange tube. The heat pump system comprises the tank heat exchanger. The tank heat exchanger provides liquid refrigerant for the inner cylinder through the liquid pipe, so that the liquid refrigerant gradually rises on the liquid level of the inner cylinder, when the liquid level reaches the position of the spraying hole, the liquid refrigerant is sprayed to the heat exchange pipe from the spraying hole, and a liquid film is formed on the surface of the heat exchange pipe, so that the liquid refrigerant exchanges heat with fluid in the heat exchange pipe.

Description

Tank heat exchanger and heat pump system

Technical Field

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

Background

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

Disclosure of Invention

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

In a first aspect, embodiments of the present application provide a tank heat exchanger including 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 cylinder and the outer cylinder and spirally wound outside the inner cylinder. The liquid pipe stretches into the inner cylinder and is used for supplying liquid refrigerant to the inner cylinder or sucking liquid refrigerant from the inner cylinder. The air pipe is arranged on the outer cylinder and is used for sucking the gaseous refrigerant from the space between the inner cylinder and the outer cylinder or providing the gaseous refrigerant to the space between the inner cylinder and the outer cylinder. Wherein, spray hole has been seted up to the inner tube, sprays the hole and is used for spraying the liquid refrigerant in the inner tube to the heat exchange tube to reduce the dry district area of heat exchange tube.

In the technical scheme, when the tank-type heat exchanger is used as an evaporator, liquid refrigerant is supplied to the inner cylinder through the liquid pipe, so that the liquid refrigerant gradually rises on the liquid surface of the inner cylinder, when the liquid surface reaches the position of the spraying hole, the liquid refrigerant is sprayed out of the spraying hole and sprayed to the heat exchange pipe, and a liquid film is formed on the surface of the heat exchange pipe, so that the liquid refrigerant can exchange heat with fluid in the heat exchange pipe, the dry pipe area of the heat exchange pipe is reduced, and the heat exchange efficiency is improved.

As an alternative technical scheme of the embodiment of the application, in the height direction of the tank heat exchanger, the spraying hole is positioned in the middle of the inner cylinder.

In the above technical scheme, the spraying hole is formed in the middle of the inner cylinder, so that the liquid refrigerant sprayed from the spraying hole can be sprayed to the heat exchange tube, the liquid refrigerant is small in height required to rise at the liquid level of the inner cylinder, and the time required from the liquid tube to the liquid level of the liquid refrigerant reaching the height of the spraying hole (the liquid refrigerant sprayed from the spraying hole) is short, so that rapid spraying is realized.

As an optional technical scheme of the embodiment of the application, a plurality of spraying holes are formed, and the plurality of spraying holes are distributed along the circumference of the inner cylinder.

In the technical scheme, the plurality of spraying holes are formed in the circumferential direction of the inner cylinder, so that the liquid refrigerant can be uniformly sprayed to the heat exchange tube.

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

In the above technical scheme, the communicating hole is formed in the lower end of the inner cylinder, when the liquid pipe supplies liquid refrigerant to the inner cylinder, a part of liquid refrigerant flows out of the inner cylinder through the communicating hole, enters between the inner cylinder and the outer cylinder, and the other part of liquid refrigerant is remained in the inner cylinder. The communicating hole generates pressure loss, so that the liquid level in the inner cylinder is larger than the liquid level outside the inner cylinder. When the liquid level in the inner cylinder reaches the height of the spraying hole, the liquid refrigerant in the inner cylinder sprays to the heat exchange tube through the spraying hole. Moreover, the air pressure in the inner cylinder is larger than the air pressure outside the inner cylinder due to the communication holes, so that the liquid refrigerant can be sprayed outside the inner cylinder more easily. In addition, the liquid refrigerant entering between the inner cylinder and the outer cylinder through the communication hole can exchange heat with the heat exchange tube, so that the problem that heat cannot be exchanged before the liquid level in the inner cylinder does not reach the height of the spraying hole is solved to a certain extent. More importantly, the liquid refrigerant entering between the inner cylinder and the outer cylinder through the communication hole is subjected to heat exchange with the heat exchange tube, the liquid refrigerant is gasified into gaseous refrigerant, and the upward movement of the gaseous refrigerant drives the liquid refrigerant sprayed out of the spraying holes to move upwards, so that the liquid refrigerant is attached to the heat exchange tube above the spraying holes, forms a liquid film, performs heat exchange with the heat exchange tube, and improves the heat exchange efficiency of the tank type heat exchanger.

As an alternative technical solution of the embodiments of the present application, the tank heat exchanger includes a check valve, which is disposed in the inner cylinder. The check valve separates the inner space of the inner barrel into an upper chamber and a lower chamber, 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 chamber to provide liquid refrigerant for the lower chamber. The check valve is configured to allow refrigerant from the lower chamber to enter the upper chamber and to prevent refrigerant from the upper chamber to enter the lower chamber.

In the technical scheme, when the tank heat exchanger is used as an evaporator by arranging the one-way valve, the liquid pipe provides liquid refrigerant for the lower chamber, one part of liquid refrigerant enters between the inner cylinder and the outer cylinder through the communication hole, and the other part of liquid refrigerant is left in the lower chamber. The liquid level of the liquid refrigerant in the lower chamber gradually rises and reaches the position of the one-way valve, at the moment, the one-way valve is opened, and the liquid refrigerant in the lower chamber is allowed to enter the upper chamber. The liquid level of the liquid refrigerant in the upper cavity is gradually increased until the liquid level 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 phase-change refrigerant is changed into a gaseous refrigerant to be discharged from the air tube. When the tank 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 chamber from the spray holes, the other part of the gaseous refrigerant enters the lower chamber from the communication holes after being liquefied, and the one-way valve prevents the refrigerant from entering the lower chamber from the upper chamber, so that the gaseous refrigerant which enters the upper chamber and is not fully subjected to heat exchange cannot be discharged out of the tank heat exchanger. Only the refrigerant that enters the lower chamber through the communication hole (because the communication hole is positioned at the lower end of the inner cylinder, when the refrigerant reaches the communication hole, heat exchange is fully performed, and the gaseous refrigerant is liquefied into liquid refrigerant), can be pumped out of the tank heat exchanger by the liquid pipe.

As an alternative 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, so that the structure is simple and compact, and the size of the tank heat exchanger is 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 with the second cylinder portion. The inner space of the first tube portion and the inner space of the second tube portion are independent from each other. The spraying hole is arranged at the first cylinder part, and the communication hole is arranged at the second cylinder part. The liquid pipe is configured to supply a part of the liquid refrigerant into the first cylinder portion and another part of the liquid refrigerant into the second cylinder portion.

In the above technical scheme, through setting up first section of thick bamboo portion and second section of thick bamboo portion for the inner space of first section of thick bamboo portion and the inner space of second section of thick bamboo portion are independent each other, and set up the hole that sprays at first section of thick bamboo portion, set up the intercommunicating pore at the second section of thick bamboo portion, liquid refrigerant that the liquid pipe provided to first section of thick bamboo portion can spray to the heat exchange tube from the hole that sprays of seting up in first section of thick bamboo portion, liquid refrigerant that the liquid pipe provided to second section of thick bamboo portion can get into between inner tube and the urceolus from the intercommunicating pore of seting up in second section of thick bamboo portion, and exchange heat with the heat exchange tube contact, liquid refrigerant gasification is gaseous refrigerant after, can further drive from spraying hole spun liquid refrigerant upward movement, make liquid refrigerant attached to the heat exchange tube of hole top, and carry out the heat exchange with it.

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

In the above technical scheme, one end of the liquid pipe extends into the second cylinder to provide liquid refrigerant for the second cylinder. By arranging the bypass hole or the bypass branch on the liquid pipe, the liquid refrigerant is conveniently supplied to the first cylinder part.

As an optional technical solution of this embodiment of the application, the tank heat exchanger further includes a control valve, where the control valve is disposed at the bypass hole or on the bypass branch, and the control valve is used for controlling the connection or disconnection of the liquid pipe and the internal space of the first cylinder.

In the above technical scheme, when the tank heat exchanger is used as the evaporator, the liquid refrigerant provided by the liquid pipe in the first cylinder part is sprayed to the heat exchange pipe from the spraying hole formed in the first cylinder part, the liquid refrigerant provided by the liquid pipe in the second cylinder part enters between the inner cylinder and the outer cylinder from the communication hole formed in the second cylinder part and is in heat exchange with the heat exchange pipe, and after the liquid refrigerant is gasified into the gaseous refrigerant, the liquid refrigerant sprayed out of the spraying hole is further driven to move upwards, so that the liquid refrigerant is attached to the heat exchange pipe above the spraying hole and is in heat exchange with the heat exchange pipe. After the liquid refrigerant exchanges heat with the heat exchange tube, the phase-change refrigerant is changed into a gaseous refrigerant to be discharged from the air tube. When the tank 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. The gas pipe provides gaseous refrigerant between the inner cylinder and the outer cylinder, the gaseous refrigerant enters the first cylinder part from the spraying hole and enters the second cylinder part from the communication hole, and the control valve prevents the refrigerant from being discharged from the bypass hole or the bypass branch, so that the gaseous refrigerant which does not fully exchange heat and enters the first cylinder part cannot be discharged out of the tank heat exchanger. Only the refrigerant that has entered the second tube portion through the communication hole (because the communication hole is located at the lower end of the inner tube, when the refrigerant reaches the communication hole, heat exchange is fully performed, and the gaseous refrigerant is liquefied into a liquid refrigerant), can be pumped out of the tank heat exchanger by the liquid tube.

As an alternative solution of the embodiment of the present application, the first cylinder is located above the second cylinder. The outer cylinder comprises an outer cylinder top wall, an outer cylinder side wall and an outer cylinder bottom wall, the upper end of the first cylinder part is closed by the outer cylinder top wall, and the lower end of the second cylinder part is closed by the outer cylinder bottom wall. The first cylinder portion includes a first cylinder portion bottom wall, and an upper end of the second cylinder portion is closed by the first cylinder portion bottom wall. One end of the liquid pipe penetrates through the bottom wall of the first cylinder part and stretches into the second cylinder part.

In the above technical scheme, 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 spraying holes. In addition, the upper end of the second cylinder is closed by the bottom wall of the first cylinder, and the lower end of the second cylinder is closed by the bottom wall of the outer cylinder, so that the refrigerant can only enter and exit the second cylinder from the communication hole. In addition, the upper end of the first tube part is connected with the top wall of the outer tube, the lower end of the second tube part is connected with the bottom wall of the outer tube, and the first tube part is connected with the second tube part, so that the connection stability of the inner tube and the outer tube is improved. Through making first section of thick bamboo diapire seal the upper end of second section of thick bamboo, first section of thick bamboo diapire plays the separation effect, separates the inner space of second section of thick bamboo and the inner space of first section of thick bamboo, like this, liquid refrigerant that the liquid pipe provided in to first section of thick bamboo can spray to the heat exchange tube from seting up in the hole that sprays of first section of thick bamboo, liquid refrigerant that the liquid pipe provided to second section of thick bamboo can get into between inner tube and the urceolus from seting up in the intercommunicating pore of second section of thick bamboo.

As an alternative 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 part extends to the outer cylinder bottom wall along the axial direction of the outer cylinder from the plane where the outer cylinder top wall is located, and the first cylinder part is sleeved on the upper part of the second cylinder part.

In the technical scheme, the plane of the top wall of the outer cylinder extends to the bottom wall of the outer cylinder along the axial direction of the outer cylinder, so that the space of the second cylinder is large enough to temporarily store liquid refrigerant 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, the cross section area of the annular cavity is smaller, the liquid level in the first cylinder part can be rapidly increased, and then liquid refrigerant is rapidly sprayed out from the spraying hole.

As an alternative solution of the embodiment of the present application, the upper end of the first barrel portion is closed by the top wall of the outer barrel.

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 contained in the outer cylinder, and the tank-type heat exchanger is small in volume.

As an alternative solution of the embodiment of the present application, the upper end of the first barrel portion extends out of the top wall of the outer barrel.

In the technical scheme, the upper end of the first cylinder part extends out of the top wall of the outer cylinder, so that the bypass branch is conveniently arranged in the first cylinder part, and the liquid pipe is conveniently used for supplying liquid refrigerant into the first cylinder part and the second cylinder part.

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

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 alternative 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 the technical scheme, the lower end face of the liquid pipe has an included angle with the horizontal plane, and has a certain area in the height direction, so that the change of the liquid level of the liquid refrigerant can be allowed, and the possibility of pulse liquid suction during condensation can be reduced.

As an alternative technical solution of the embodiment of the present application, in the height direction of the tank heat exchanger, the air pipe is located above the spray hole.

In the technical scheme, the spraying holes are formed in the lower portion of the air pipe, so that the liquid refrigerant cannot be sprayed on the air pipe in the spraying process, the air pipe cannot directly discharge the liquid refrigerant which does not exchange heat with the heat exchange pipe, the liquid refrigerant can exchange heat with the heat exchange pipe fully, 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 comprising a tank heat exchanger as described above. The heat pump system has higher heat exchange efficiency by arranging the tank-type heat exchanger.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

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) according to 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 tank heat exchanger being a condenser) according to an embodiment of the present application;

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

FIG. 5 is a cross-sectional view of a second tank heat exchanger provided in 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 view of a part of a structure of a fourth tank heat exchanger according to 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 tank heat exchanger provided in an embodiment of the present application;

fig. 10 is a cross-sectional view of a seventh tank heat exchanger provided in an embodiment of the present application;

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

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

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of 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 apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the embodiments of the present application, it should be understood that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like indicate orientations or positional relationships based on those shown in the drawings, or those conventionally put in place when the product of the application is used, or those conventionally understood by those skilled in the art, merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the application.

Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not 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 explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

A heat exchanger is a device that transfers a portion of the heat of a hot fluid to a cold fluid, also known as a heat exchanger. The heat exchanger plays an important role in chemical industry, petroleum, power, food and other industrial production, and can be used as a heater, a cooler, a condenser, an evaporator, a reboiler and the like in chemical production, and the application is wide.

Heat exchangers come in many forms, such as tank heat exchangers, shell and tube heat exchangers, and the like. The tank-type heat exchanger is a tank-shaped heat exchanger, and is also called an efficient tank. When the tank heat exchanger is used as a condenser, compared with a shell-and-tube heat exchanger, the tank heat exchanger has the advantages of small volume and high heat exchange efficiency. But it is used as an evaporator with low heat exchange efficiency.

The tank heat exchanger has the working principle that the tank body is provided with a refrigerant, the heat exchange tube is provided with a medium to be subjected to heat exchange, such as water, namely, 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 intensively distributed at the bottom of the tank body, and occupies about 1/5 of the volume of the tank body. In other words, only the heat exchange tube near 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 contacted with the refrigerant and cannot exchange heat with the refrigerant. The heat exchange tube which is not soaked in the refrigerant is drier to form a dry tube. The part of the heat exchange tube which is not immersed by the liquid refrigerant is called a dry tube area, and the heat exchange efficiency of the dry tube area is lower. In short, the applicant found that when a tank heat exchanger is used as an evaporator, the refrigerant thereof does not sufficiently cover the heat exchange tube, resulting in a lower heat exchange efficiency when the tank heat exchanger is used as an evaporator.

Based on the above considerations, in order to solve the problem that the refrigerant cannot sufficiently cover the heat exchange tube when the tank heat exchanger is used as an evaporator, the applicant has conducted intensive studies and has designed a tank heat exchanger. The tank 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 cylinder and the outer cylinder and spirally wound outside the inner cylinder. The liquid pipe stretches into the inner cylinder and is used for supplying liquid refrigerant to the inner cylinder or sucking liquid refrigerant from the inner cylinder. The air pipe is arranged on the outer cylinder and is used for sucking the gaseous refrigerant from the space between the inner cylinder and the outer cylinder or providing the gaseous refrigerant to the space between the inner cylinder and the outer cylinder. Wherein, spray hole has been seted up to the inner tube, sprays the hole and is used for spraying the liquid refrigerant in the inner tube to the heat exchange tube to reduce the dry district area of heat exchange tube. When the tank-type heat exchanger is used as an evaporator, liquid refrigerant is supplied to the inner cylinder through the liquid pipe, so that the liquid refrigerant gradually rises on the liquid level of the inner cylinder, when the liquid level reaches the position of the spraying hole, the liquid refrigerant is sprayed out of the spraying hole and sprayed to the heat exchange pipe, a liquid film is formed on the surface of the heat exchange pipe, the heat exchange between the liquid refrigerant and fluid in the heat exchange pipe is facilitated, the dry pipe area of the heat exchange pipe is reduced, and the heat exchange efficiency is improved. When the tank 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 of petroleum, chemical industry, light industry, pharmacy, energy and the like, and is used for heating low-temperature fluid or cooling high-temperature fluid, vaporizing liquid into steam or condensing steam 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 part of certain process equipment, such as a heat exchanger in an ammonia synthesis tower. In general, the tank heat exchanger can be used as a heating or cooling unit of a floor heating, a fan 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 examples illustrate heat pump systems.

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 in communication with the inlet of the condenser 31, the outlet of the condenser 31 is in communication with the tank heat exchanger 10 through the expansion valve 40, and the tank heat exchanger 10 is in communication with the inlet of said 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 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 medium-temperature high-pressure gaseous refrigerant, then enters the expansion valve 40, is converted into liquid refrigerant, enters the tank heat exchanger 10, exchanges heat with a medium to be subjected to heat exchange, cools the medium to be subjected to heat exchange, and flows to the user terminal 700 for a user to use after the medium to be subjected to heat exchange is cooled. The user terminal 700 may be an air conditioner into which cold water in the tank heat exchanger 10 enters, and exchanges heat with 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 inside 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 low-pressure gaseous refrigerant, and the gaseous refrigerant returns to the compressor 20 again.

In some embodiments, a low pressure valve 70 is provided between the compressor 20 and the tank heat exchanger 10 for monitoring system pressure, and an excessive pressure may result in shutdown protection of the compressor 20. It will be appreciated that when the pressure is monitored to be too low, 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 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 for monitoring system pressure, which would allow for shutdown protection of the compressor 20. It will be appreciated that when the pressure is monitored to be too high, 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 via a gas-liquid separator 60. The gas-liquid separator 60 is used for separating liquid mixed in the low-temperature low-pressure gaseous refrigerant discharged from the tank heat exchanger 10, for example, liquid refrigerant and/or lubricating oil contained in the gaseous refrigerant. In addition, the tank heat exchanger 10 has a dedicated 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 diagram of a heat pump system 1000 (with a four-way valve 50, and a tank heat exchanger 10 as 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 tank 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, the heat exchanger 30 serves as a condenser, and the four-way valve 50 communicates the outlet of the compressor 20 with the inlet of the heat exchanger 30, and communicates the inlet of the compressor 20 with the tank heat exchanger 10. The flow conditions of the refrigerant in the heat pump system 1000 are as follows: the low-temperature low-pressure gaseous refrigerant is compressed by the compressor 20, is converted into high-temperature high-pressure gaseous refrigerant, flows to the heat exchanger 30 from the outlet of the compressor 20, releases heat in the heat exchanger 30, is converted into medium-temperature high-pressure gaseous refrigerant, then enters the expansion valve 40, is converted into liquid refrigerant, enters the tank heat exchanger 10, exchanges heat with a medium to be subjected to heat exchange, cools the medium to be subjected to heat exchange, and flows to the user terminal 700 for a user to use after the medium to be subjected to heat exchange is cooled. The user terminal 700 may be an air conditioner into which cold water in the tank heat exchanger 10 enters, and exchanges heat with 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 inside 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 low-pressure gaseous refrigerant, and the gaseous refrigerant returns to the compressor 20 again.

In some embodiments, a low pressure valve 70 is provided between the inlet of the compressor 20 and the four-way valve 50 for monitoring system pressure, and if the pressure is too low, the compressor 20 is shut down for protection. It should be appreciated that when too low a pressure is monitored, 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 tank heat exchanger 10, and the low-temperature low-pressure gaseous refrigerant discharged from the tank heat exchanger 10 can enter the compressor 20.

In some embodiments, the four-way valve 50 communicates with the 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 communicates 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 the low-temperature 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 heat exchanger 10 has a dedicated 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 for monitoring system pressure, which would allow for shutdown protection of the compressor 20. It should be appreciated that when excessive pressure is monitored, 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 diagram of a heat pump system 1000 (with a four-way valve 50, and a condenser as the tank heat exchanger 10) according to the present embodiment. At this time, the tank 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 tank heat exchanger 10, and communicates the inlet of the compressor 20 with the heat exchanger 30. The flow conditions of the refrigerant in the heat pump system 1000 are as follows: the low-temperature low-pressure gaseous refrigerant is compressed by the compressor 20, is converted into 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 subjected to heat exchange, heats the medium to be subjected to heat exchange, and flows to the user terminal 700 for use by a user after being cooled. The user terminal 700 may be a water heater or a heating system, and hot water in the tank heat exchanger 10 enters the water heater to supply domestic hot water to a user, or enters the heating system to exchange heat with indoor air to perform heating. A water pump 90 is provided between the user terminal 700 and the tank heat exchanger 10 to pump hot water in the tank heat exchanger 10 into an air conditioner or a heating system. The high-temperature and high-pressure gas refrigerant is converted into a high-temperature and high-pressure liquid refrigerant through the tank heat exchanger 10, then the high-temperature and high-pressure liquid refrigerant enters the expansion valve 40 and is converted into a low-temperature and low-pressure liquid refrigerant, the low-temperature and low-pressure liquid refrigerant enters the heat exchanger 30, and the liquid refrigerant is converted into a low-temperature and low-pressure gaseous refrigerant after passing through the heat exchanger 30 and is returned to the compressor 20 again.

At this time, when the pressure is monitored to be too low, the compressor 20 and the four-way valve 50 are disconnected, that is, 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, namely, the compressor 20 is communicated with the heat exchanger 30, and the low-temperature low-pressure gaseous refrigerant discharged by the heat exchanger 30 can enter the compressor 20. When the pressure is monitored to be too high, 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 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 the low-temperature 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 cross-sectional view of a first tank heat exchanger 10 according to the present embodiment. The present embodiment provides a tank heat exchanger 10, and the tank heat exchanger 10 includes an outer tub 100, an inner tub 200, a heat exchange pipe 300, a liquid pipe 400, and an air pipe 500. The inner cylinder 200 is disposed within the outer cylinder 100. The heat exchange tube 300 is disposed between the inner tube 200 and the outer tube 100, and spirally wound around the outer tube 200. The liquid pipe 400 extends into the inner tube 200 to supply liquid refrigerant to the inner tube 200 or suck liquid refrigerant from the inner tube 200. The gas pipe 500 is provided to 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 between the inner tub 200 and the outer tub 100. Wherein, the inner tube 200 is provided with spray holes 210, and the spray holes 210 are used for spraying liquid refrigerant in the inner tube 200 to the heat exchange tube 300 so as to reduce the dry pipe area of the heat exchange tube 300. When the tank heat exchanger 10 is used as an evaporator, liquid refrigerant is supplied to the inner cylinder 200 through the liquid pipe 400, so that the liquid refrigerant gradually rises at the liquid level of the inner cylinder 200, and when the liquid level reaches the position of the spraying hole 210, the liquid refrigerant is sprayed out of the spraying hole 210 and sprayed to the dry pipe area of the heat exchange pipe 300, and a liquid film is formed on the surface of the heat exchange pipe 300, so that the liquid refrigerant exchanges heat with fluid in the heat exchange pipe 300, the dry pipe area of the heat exchange pipe 300 is reduced, and the heat exchange efficiency is improved.

Referring to fig. 4, the outer cylinder 100 has a cylindrical structure, and two ends of the outer cylinder 100 are closed to form a closed space, thereby improving heat exchange efficiency. The bottom of the outer tub 100 is provided with legs 110, the legs 110 being adapted to contact the ground, supporting the entire tank heat exchanger 10, to reduce the risk of damage to the outer tub 100 caused by direct contact of the outer tub 100 with the ground. The specific shape of the outer tube 100 is not limited, and for example, the outer tube 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 closing both ends of the outer tub side wall 130, respectively. In other words, the outer tub top wall 120 and the outer tub bottom wall 140 are disposed opposite each other, and the outer tub side wall 130 connects the outer tub top wall 120 and the outer tub bottom wall 140. The outer cylinder sidewall 130 refers to an outer wall of the outer cylinder 100 parallel to the axial direction of the outer cylinder 100, and the outer cylinder top wall 120 and the outer cylinder bottom wall 140 are outer walls of the outer cylinder 100 perpendicular to the axial direction of the outer cylinder 100, and the outer cylinder top wall 120 and the outer cylinder bottom wall 140 are disposed opposite to each other in the axial direction of the outer cylinder 100.

The heat exchange tube 300 is used for passing a medium to be heat exchanged, such as water. The heat exchange tube 300 is spirally wound around the outer wall of the inner tube 200. Two ends of the heat exchange tube 300 extend out of the outer tube 100, one end of which is a water inlet end 310 and the other end of which is a water outlet end 320. Optionally, 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 extends into the inner tube 200, and when the tank heat exchanger 10 is used as an evaporator, the liquid pipe 400 is used to supply liquid refrigerant into the inner tube 200. When the tank heat exchanger 10 is used as the condenser 31, the liquid pipe 400 serves to suck the liquid refrigerant from the inner tube 200. In this embodiment, the liquid tube 400 is near the bottom of the inner tube 200 to facilitate the suction of the refrigerant from the inner tube 200.

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

Referring to fig. 4, the tank 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 lubricant 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 provided near the bottom of the tank heat exchanger 10 so as to facilitate the extraction of the lubricating oil. The oil return pipe 600 is used to communicate with the gas-liquid separator 60 to recover lubricating oil.

The inner cylinder 200 is disposed in the outer cylinder 100, the inner cylinder 200 has a cylindrical structure, and both ends of the inner cylinder 200 are closed. In some embodiments, both ends of the inner cartridge 200 are connected to the outer cartridge top wall 120 and the outer cartridge 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 cylinder structure. The wall surface of the inner cylinder 200 is provided with spray holes 210, and the spray holes 210 are used for spraying liquid refrigerant in the inner cylinder 200 to the heat exchange tube 300 so as to reduce the dry pipe area of the heat exchange tube 300. As previously mentioned, the dry pipe region refers to the portion of the heat exchange pipe 300 that is not immersed by the liquid refrigerant. In this embodiment, the liquid refrigerant can be sprayed to the heat exchange tube 300 through the spraying holes 210, so that the liquid refrigerant covers the dry tube region, and the heat exchange efficiency is improved.

Referring to fig. 4, in the present embodiment, in the height direction (X direction as shown in fig. 4) of the tank heat exchanger 10, the shower holes 210 are located at the middle of the inner tube 200. It is also understood that the shower 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 tank heat exchanger 10. By arranging the spray holes 210 at the middle part of the inner cylinder 200, the liquid refrigerant sprayed from the spray holes 210 can be sprayed to the heat exchange tube 300, and meanwhile, the liquid refrigerant needs to rise to a smaller height at the liquid surface of the inner cylinder 200, and the time required from the liquid tube 400 to the liquid surface of the liquid refrigerant reaching the height of the spray holes 210 (the liquid refrigerant sprayed from the spray holes 210) is shorter, so that rapid spraying is realized.

In some embodiments, the spray holes 210 are located in an upper portion of the inner drum 200 in a height direction of the tank heat exchanger 10. It is also understood that the shower holes 210 are located at an upper position of the outer tub 100 in the height direction of the tank heat exchanger 10. In this way, the liquid refrigerant sprayed from the spraying holes 210 can cover a larger area of the heat exchange tube 300, the spraying effect is better, and the heat exchange efficiency is higher.

In the present embodiment, a plurality of spray holes 210 are provided, and the plurality of spray holes 210 are distributed along the circumferential direction of the inner cylinder 200. By forming the plurality of spray holes 210 in the circumferential direction of the inner cylinder 200, the liquid refrigerant can be sprayed from the plurality of spray holes 210 to the heat exchange tube 300 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 tank heat exchanger 10 is improved. Optionally, the plurality of spraying holes 210 are uniformly distributed in the circumferential direction of the inner cylinder 200, so that the spraying uniformity is better, the liquid refrigerant is facilitated to cover the heat exchange tube 300, and the heat exchange efficiency is improved. In addition, by providing the plurality of spraying holes 210 along the circumferential direction of the inner tube 200, it is possible to ensure that the liquid refrigerant is uniformly sprayed to the heat exchange tube 300.

In this embodiment, referring to fig. 4, a communication hole 220 is formed at the lower end of the inner cylinder 200, and the communication hole 220 communicates the inner cylinder 200 and the outer cylinder 100. The aperture of the communication hole 220 is smaller, so that a part of the liquid refrigerant flows out of the inner cylinder 200 through the communication hole 220, enters between the inner cylinder 200 and the outer cylinder 100, and another part of the liquid refrigerant remains in the inner cylinder 200. The communication hole 220 generates a pressure loss so that the liquid level in the inner cylinder 200 is greater 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 sprays toward the heat exchange tube 300 through the spray holes 210. The specific value of the aperture of the communication hole 220 may be determined according to the flow rate of the liquid refrigerant provided when the heat pump system 1000 is in use. As long as the amount of liquid refrigerant remaining in the inner tube 200 can be ensured to be larger than the amount of liquid refrigerant flowing out of the inner tube 200 through the communication hole 220.

The presence of the communication hole 220 may cause the air pressure inside the inner tube 200 to be greater than the air pressure outside the inner tube 200, so that the liquid refrigerant may be more easily sprayed outside the inner tube 200. In addition, the liquid refrigerant entering 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 holes 210 is solved to a certain extent. More importantly, the liquid refrigerant entering between the inner cylinder 200 and the outer cylinder 100 through the communication hole 220 is subjected to heat exchange with the heat exchange tube 300, the liquid refrigerant is gasified into a gaseous refrigerant, and the upward movement of the gaseous refrigerant drives the liquid refrigerant sprayed out of the spraying holes 210 to move upward, so that the liquid refrigerant is attached to the heat exchange tube 300 above the spraying holes 210, forms a liquid film, performs heat exchange with the heat exchange tube 300 above the spraying holes 210, and improves the heat exchange efficiency of the tank heat exchanger 10.

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 larger 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 cross-sectional view of a second tank heat exchanger 10 according to an embodiment of the present disclosure. The second type of tank heat exchanger 10 is substantially identical in construction to the first type of tank heat exchanger 10 described above. The difference is that the air pipe 500 of the first type of the tank heat exchanger 10 is disposed at the outer tub side wall 130, and the air pipe 500 of the second type of the tank heat exchanger 10 is disposed at the outer tub top wall 120.

Referring to fig. 6, fig. 6 is a cross-sectional view of a third tank heat exchanger 10 according to an embodiment of the present disclosure. The third type of tank heat exchanger 10 is substantially identical in construction to the first type of 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 tube 200. The check valve 250 divides the inner space of the inner cylinder 200 into an upper chamber 230 and a lower chamber 240, the spray holes 210 are opened on the wall surface of the upper chamber 230, and the communication holes 220 are opened on 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 from the lower chamber 240 to enter the upper chamber 230 and to prevent refrigerant from the upper chamber 230 from entering the lower chamber 240. By providing the check valve 250, when the tank heat exchanger 10 is used as an evaporator, the liquid pipe 400 provides liquid refrigerant to the lower chamber 240, a part of the liquid refrigerant enters between the inner cylinder 200 and the outer cylinder 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 increases and reaches the position of the check valve 250, and at this time, the check valve 250 is opened, allowing 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 is gradually increased until the liquid level reaches the position of the spray hole 210, and the liquid refrigerant in the upper chamber 230 is sprayed out of the spray hole 210 and onto the heat exchange tube 300. After the liquid refrigerant exchanges heat with the heat exchange tube 300, the phase-change gaseous refrigerant is discharged from the gas pipe 500. When the tank heat exchanger 10 is used as a condenser, a gas refrigerant is supplied between the inner tube 200 and the outer tube 100 through the gas tube 500, a part of the gas refrigerant enters the upper chamber 230 through the spray holes 210, and the other part of the gas refrigerant enters the lower chamber 240 through the communication holes 220 after being liquefied, and the gas refrigerant which enters the upper chamber 230 and is not sufficiently subjected to heat exchange cannot be discharged out of the tank heat exchanger 10 because the check valve 250 prevents the refrigerant from entering the lower chamber 240 from the upper chamber 230. Only the refrigerant that has entered 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 has sufficiently exchanged heat when reaching the communication hole 220, and the gaseous refrigerant is liquefied into a liquid refrigerant) can be drawn out of the tank heat exchanger 10 by the liquid tube 400.

Optionally, the check valve 250 is sleeved on the liquid pipe 400, that is, the liquid pipe 400 is penetrated through the check valve 250. With the adoption of the arrangement, the structure is simple and compact, and the volume of the tank heat exchanger 10 is 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 one-way valve 250.

Referring to fig. 7, fig. 7 is a schematic view of a portion of a fourth tank heat exchanger 10 according to an embodiment of the present disclosure. The fourth type of tank heat exchanger 10 is substantially identical in construction to the third type of tank heat exchanger 10 described above. The difference is 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 type of the tank heat exchanger 10, the lower end (end extending into the inner tube 200) of the liquid tube 400 is bent so that the lower end surface of the liquid tube 400 forms 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), and the liquid level of the liquid refrigerant can be allowed to change, so that the possibility of pulse liquid suction during condensation can be reduced. Wherein, pulse imbibition refers to: when the liquid refrigerant is pumped by the liquid pipe 400, the liquid refrigerant and the air are distributed in the liquid pipe 400 one by one due to the change of the liquid level of the liquid refrigerant, and the pumped air is all the liquid refrigerant in a period of time. 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 and a section of pure liquid occur in the liquid pipe 400, i.e. a pulse liquid suction phenomenon occurs. When the lower end surface of the liquid pipe 400 has an angle with the horizontal plane, the liquid surface may be allowed to vary within a 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 level of the liquid refrigerant exceeds the upper side of the lower end surface of the liquid pipe 400, the liquid pipe 400 sucks the liquid refrigerant. When the liquid level of the liquid refrigerant is 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, the liquid pipe 400 sucks a part of air and a part of liquid refrigerant, so that the condition 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 piece 253 is arranged opposite to the main body 251, the limiting piece 253 is fixedly connected to the outer wall of the liquid pipe 400 and the inner wall of the outer barrel 100, and a through hole for allowing the refrigerant to pass through is formed in the limiting piece 253. The limiting member 253 may be formed by connecting a plurality of blocking posts. The limiting member 253 may be a baffle plate with a through hole. The floating baffle 252 is disposed between the stopper 253 and the main body 251, and the floating baffle 252 is configured to block the flow hole 2511, and when the floating baffle 252 blocks the flow hole 2511, the refrigerant cannot enter the lower chamber 240 from the upper chamber 230, and cannot enter the upper chamber 230 from the lower chamber 240. The floating damper 252 can be separated from the main body 251 under the buoyancy of the liquid refrigerant to open the flow hole 2511, and when the flow 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. Normally, the floating damper 252 is attached to the main body 251 by gravity, and shields the flow hole 2511.

Specifically, when the tank heat exchanger 10 is used as an evaporator, the liquid pipe 400 supplies 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 circulation hole 2511 is not blocked any more, the circulation hole 2511 is opened, and the liquid refrigerant in the lower chamber 240 is allowed to enter the upper chamber 230. The liquid level of the liquid refrigerant in the upper chamber 230 is gradually increased until the liquid level reaches the position of the spray hole 210, and the liquid refrigerant in the upper chamber 230 is sprayed out of the spray hole 210 and onto the heat exchange tube 300. After the liquid refrigerant exchanges heat with the heat exchange tube 300, the phase-change gaseous refrigerant is discharged from the gas pipe 500. When the tank heat exchanger 10 is used as a condenser, a gas pipe 500 provides a 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 hole 210, and another part of the gaseous refrigerant enters the lower chamber 240 from the communication hole 220 after being liquefied, and the floating baffle 252 has no buoyancy, i.e., closes the flow hole 2511 under the action of gravity, so that the refrigerant cannot enter the lower chamber 240 from the upper chamber 230, and therefore, the gaseous refrigerant which does not sufficiently perform heat exchange, entering the upper chamber 230 cannot be discharged out of the tank heat exchanger 10. Only the refrigerant that has entered 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 has sufficiently exchanged heat when reaching the communication hole 220, and the gaseous refrigerant is liquefied into a liquid refrigerant) can be drawn out of the tank heat exchanger 10 by the liquid tube 400.

In other embodiments, the floating damper 252 is rotatably connected to the main body 251, and the floating damper 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, so as to prevent the floating baffle 252 from rotating excessively, and can not 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 being movably disposed to the inner barrel 200 along an axial direction of the inner barrel 200, the floating baffle 252 not allowing 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 baffle 252. Specifically, when the tank heat exchanger 10 is used as an evaporator, the liquid pipe 400 supplies 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 increases 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 a position lower than the spraying holes 210 to a position higher than the spraying holes 210, and when the liquid level of the liquid refrigerant reaches the height of the spraying holes 210, the liquid refrigerant is sprayed out of the spraying holes 210 and onto the heat exchange tube 300. After the liquid refrigerant exchanges heat with the heat exchange tube 300, the phase-change gaseous refrigerant is discharged from the gas pipe 500. When the tank heat exchanger 10 is used as a condenser, a gas refrigerant is supplied between the inner tube 200 and the outer tube 100 through the gas tube 500, a part of the gas refrigerant enters the upper chamber 230 from the spray hole 210, and another part of the gas refrigerant enters the lower chamber 240 from the communication hole 220 after being liquefied, and the gas refrigerant cannot move from the upper side of the floating baffle 252 to the lower side of the floating baffle 252 due to the fact that the floating baffle 252 has no buoyancy, i.e., is positioned below the spray hole 210 under the action of gravity, so that the gas refrigerant which does not sufficiently perform heat exchange, entering the upper chamber 230, cannot exit the tank heat exchanger 10. Only the refrigerant that has entered 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 has sufficiently exchanged heat when reaching the communication hole 220, and the gaseous refrigerant is liquefied into a liquid refrigerant) can be drawn out of the tank heat exchanger 10 by the liquid tube 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 disclosure. The fifth type of tank heat exchanger 10 is substantially identical in construction to the first type of tank heat exchanger 10 described above. The difference is that the inner tube 200 of the fifth tank heat exchanger 10 includes a first tube portion 260 and a second tube portion 270, and the first tube portion 260 is connected to the second tube portion 270. The inner space of the first cylinder 260 and the inner space of the second cylinder 270 are independent from each other. The spraying hole 210 is provided in the first cylinder 260, and the communication hole 220 is provided in the second cylinder 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.

By providing the first tube portion 260 and the second tube portion 270, the inner space of the first tube portion 260 and the inner space of the second tube portion 270 are independent from each other, the first tube portion 260 is provided with the spraying hole 210, the second tube portion 270 is provided with the communication hole 220, the liquid refrigerant provided by the liquid tube 400 to the first tube portion 260 is sprayed to the heat exchange tube 300 from the spraying hole 210 provided in the first tube portion 260, the liquid refrigerant provided by the liquid tube 400 to the second tube portion 270 enters between the inner tube 200 and the outer tube 100 from the communication hole 220 provided in the second tube portion 270 and contacts with the heat exchange tube 300 to exchange heat, and the liquid refrigerant gasified into the gaseous refrigerant further drives the liquid refrigerant sprayed from the spraying hole 210 to move upwards, so that the liquid refrigerant is adhered to the heat exchange tube 300 above the spraying hole 210 and exchanges heat with the heat exchange tube. In some embodiments, the first barrel 260 is positioned above the second barrel 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 tub portion 260 is closed by the outer tub top wall 120, and a lower end of the second tub portion 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, with an end of the first barrel side wall 262 remote from the first barrel bottom wall 261 being closed by the outer barrel top wall 120. The upper end of the second cylinder 270 is closed by the first cylinder bottom wall 261. One end of the liquid pipe 400 passes through the first cylinder bottom wall 261 and protrudes into the second cylinder 270. The upper end of the first cylinder 260 is closed by the outer cylinder top wall 120 so that the refrigerant can only enter and exit the first cylinder 260 from the shower holes 210. In addition, 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 only enter and exit the second tube 270 from the communication hole 220. In addition, the upper end of the first tube portion 260 is connected to the outer tube top wall 120, the lower end of the second tube portion 270 is connected to the outer tube bottom wall 140, and the first tube portion 260 is connected to the second tube portion 270, thereby increasing the connection stability between the inner tube 200 and the outer tube 100. By closing the upper end of the second tube 270 by the first tube bottom wall 261, the first tube bottom wall 261 serves as a partition to partition the inner space of the second tube 270 from the inner space of the first tube 260, so that the liquid refrigerant supplied from the liquid tube 400 into the first tube 260 is sprayed from the spray holes 210 formed in the first tube 260 to the heat exchange tube 300, and the liquid refrigerant supplied from the liquid tube 400 into the second tube 270 is introduced between the inner tube 200 and the outer tube 100 from the communication hole 220 formed in the second tube 270.

Referring to fig. 8, one end of the liquid pipe 400 extends into the second cylinder 270, a bypass hole 430 is disposed on a wall of the liquid pipe 400, and the bypass hole 430 is in communication with an inner wall space of the first cylinder 260. Specifically, the liquid pipe 400 penetrates the first cylinder 260 from the upper end of the first cylinder 260, and extends into the second cylinder 270 through the first cylinder bottom wall 261, and the bypass hole 430 is opened at a portion of the liquid pipe 400 located in the first cylinder 260. Optionally, the bypass hole 430 is near the top of the first barrel portion 260. The number of bypass holes 430 may be one or more, which is not limited. When the number of the bypass holes 430 is plural, they may be opened along the length direction of the liquid pipe 400 or may be opened 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 connection or disconnection of the liquid pipe 400 with the inner space of the first cylinder 260.

By providing the control valve, when the tank heat exchanger 10 is used as an evaporator, the liquid refrigerant provided by the liquid pipe 400 into the first cylinder 260 is sprayed to the heat exchange pipe 300 from the spraying hole 210 formed in the first cylinder 260, the liquid refrigerant provided by the liquid pipe 400 into the second cylinder 270 enters between the inner cylinder 200 and the outer cylinder 100 from the communication hole 220 formed in the second cylinder 270 and contacts with the heat exchange pipe 300 to exchange heat, and after the liquid refrigerant is gasified into a gaseous refrigerant, the liquid refrigerant sprayed from the spraying hole 210 is further driven to move upwards, so that the liquid refrigerant is attached to the heat exchange pipe 300 above the spraying hole 210 and exchanges heat with the heat exchange pipe 300. After the liquid refrigerant exchanges heat with the heat exchange tube 300, the phase-change gaseous refrigerant is discharged from the gas pipe 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 hole 430. A part of the gaseous refrigerant is introduced into the first cylinder 260 through the spray holes 210 and the other part is introduced into the second cylinder 270 through the communication holes 220 after being liquefied by the gas pipe 500, and the control valve 420 prevents the refrigerant from being discharged from the bypass holes 430, so that the gaseous refrigerant which has not sufficiently exchanged heat introduced into the first cylinder 260 cannot be discharged out of the tank heat exchanger 10. Only the refrigerant that has entered the second tube portion 270 through the communication hole 220 (since the communication hole 220 is located at the lower end of the inner tube 200, the refrigerant has sufficiently exchanged heat when reaching the communication hole 220, and the gaseous refrigerant is liquefied into a liquid refrigerant) can be drawn out of the tank heat exchanger 10 by the liquid tube 400.

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

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

Referring to fig. 10, fig. 10 is a cross-sectional view of a seventh tank heat exchanger 10 according to an embodiment of the present disclosure. The seventh tank heat exchanger 10 is basically identical in structure to the fifth tank heat exchanger 10 described above. The difference is that, in the seventh tank heat exchanger 10, the outer tube 100 includes an outer tube top wall 120, an outer tube side wall 130, and an outer tube bottom wall 140, the second tube portion 270 extends from the plane of the outer tube top wall 120 to the outer tube bottom wall 140 along the axial direction of the outer tube 100, and the first tube portion 260 is sleeved on the upper portion of the second tube portion 270. The second tube portion 270 extends from the plane of the top wall 120 of the outer tube to the bottom wall 140 of the outer tube 100 in the axial direction of the outer tube 100, so that the space of the second tube portion 270 is large enough to temporarily store the liquid refrigerant when the flow rate of the liquid tube 400 fluctuates. The first cylinder 260 is sleeved on the second cylinder 270, an annular chamber is formed between the first cylinder 260 and the second cylinder 270, and the cross section area of the annular chamber is smaller, so that the liquid level in the first cylinder 260 can be rapidly increased, and then liquid refrigerant is rapidly sprayed out from 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 cylinder 260 is closed by the outer cylinder top wall 120 so that the inner cylinder 200 is completely accommodated in the outer cylinder 100, and the tank heat exchanger 10 has a small volume. One end of the liquid pipe 400 passes through the top wall 120 of the outer cylinder to extend into the second cylinder 270, a bypass branch 410 is arranged on the pipe wall of the liquid pipe 400, and the bypass branch 410 is communicated with the first cylinder 260. The liquid pipe 400 is extended into the second cylinder 270 to supply the liquid refrigerant to the second cylinder 270. By providing the bypass branch 410 on the liquid pipe 400, the liquid refrigerant is conveniently supplied to the first cylinder 260.

The tank heat exchanger 10 further includes a control valve 420, the control valve 420 being disposed on the bypass branch 410, the control valve 420 being configured to control the fluid pipe 400 to be connected to or disconnected from the inner space of the first cylinder 260. By providing the control valve 420, when the tank heat exchanger 10 is used as an evaporator, the liquid refrigerant provided by the liquid pipe 400 into the first cylinder 260 is sprayed to the heat exchange pipe 300 from the spraying hole 210 formed in the first cylinder 260, the liquid refrigerant provided by the liquid pipe 400 into the second cylinder 270 enters between the inner cylinder 200 and the outer cylinder 100 from the communication hole 220 formed in the second cylinder 270 and contacts with the heat exchange pipe 300 to exchange heat, and after the liquid refrigerant is gasified into a gaseous refrigerant, the liquid refrigerant sprayed from the spraying hole 210 is further driven to move upwards, so that the liquid refrigerant is attached to the heat exchange pipe 300 above the spraying hole 210 and is subjected to heat exchange with the liquid refrigerant. After the liquid refrigerant exchanges heat with the heat exchange tube 300, the phase-change gaseous refrigerant is discharged from the gas pipe 500. When the tank heat exchanger 10 is used as a condenser, the control valve 420 is closed, and the refrigerant is prevented from being discharged from the bypass branch 410. A part of the gaseous refrigerant is introduced into the first tube portion 260 through the spray holes 210 by supplying the gaseous refrigerant between the inner tube 200 and the outer tube 100 through the gas pipe 500, and the other part of the gaseous refrigerant is introduced into the second tube portion 270 through the communication hole 220 after being liquefied, and the control valve 420 prevents the refrigerant from being discharged from the bypass branch 410, so that the gaseous refrigerant which has not sufficiently exchanged heat in the first tube portion 260 cannot be discharged out of the tank heat exchanger 10. Only the refrigerant that has entered the second tube portion 270 through the communication hole 220 (since the communication hole 220 is located at the lower end of the inner tube 200, the refrigerant has sufficiently exchanged heat when reaching the communication hole 220, and the gaseous refrigerant is liquefied into a liquid refrigerant) can be drawn out of the tank heat exchanger 10 by the liquid tube 400.

Referring to fig. 11, fig. 11 is a cross-sectional view of an eighth tank heat exchanger 10 according to the present embodiment. The eighth type of tank heat exchanger 10 is basically the same as the seventh type of tank heat exchanger 10 described above. Except that in the eighth tank heat exchanger 10, the upper end of the first cylindrical portion 260 protrudes from the outer cylindrical top wall 120. By extending the upper end of the first tube portion 260 beyond the outer tube top wall 120, the bypass branch 410 is provided in the first tube portion 260, and the liquid tube 400 is provided to supply the liquid refrigerant into the first tube portion 260 and the second tube portion 270.

It should be noted that in some embodiments, in the height direction of the tank heat exchanger 10 (X direction as shown in fig. 11), the air pipe 500 is located above the shower hole 210. Through setting up the hole 210 that sprays in the below of trachea 500 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 heat transfer with heat exchange tube 300, thereby make liquid refrigerant can fully exchange heat with heat exchange tube 300, improve tank heat exchanger 10's heat exchange efficiency.

The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A tank heat exchanger, comprising:

an outer cylinder (100);

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

a heat exchange tube (300) which is arranged between the inner cylinder (200) and the outer cylinder (100) and spirally wound outside the inner cylinder (200);

a liquid pipe (400) extending into the inner cylinder (200) for supplying a liquid refrigerant to the inner cylinder (200) or sucking a liquid refrigerant from the inner cylinder (200); and

a gas pipe (500) provided in the outer tube (100) for sucking a gaseous refrigerant from between the inner tube (200) and the outer tube (100) or supplying a gaseous refrigerant between the inner tube (200) and the outer tube (100);

wherein, the inner cylinder (200) is provided with a spray hole (210), and the spray hole (210) is used for spraying liquid refrigerant in the inner cylinder (200) to the heat exchange tube (300);

the lower end of the inner cylinder (200) is provided with a communication hole (220), and the communication hole (220) is communicated with the inner cylinder (200) and the outer cylinder (100);

the tank heat exchanger (10) comprises a one-way valve (250), the one-way valve (250) is arranged in the inner cylinder (200), the one-way valve (250) divides the inner space of the inner cylinder (200) into an upper chamber (230) and a lower chamber (240), the spraying holes (210) are formed in the wall surface of the upper chamber (230), the communication holes (220) are formed in the wall surface of the lower chamber (240), one end of the liquid pipe (400) extends into the lower chamber (240) so as to provide liquid refrigerant for the lower chamber (240), and the one-way valve (250) is configured to allow the refrigerant to enter the upper chamber (230) from the lower chamber (240) and prevent the refrigerant from entering the lower chamber (240) from the upper chamber (230).

2. Tank heat exchanger according to claim 1, characterized in that the spray holes (210) are located in the middle of the inner cylinder (200) in the height direction of the tank heat exchanger (10).

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

4. The tank heat exchanger according to claim 1, wherein the one-way valve (250) is sleeved on the liquid pipe (400).

5. The tank heat exchanger according to claim 1, wherein the inner tube (200) includes a first tube portion (260) and a second tube portion (270), the first tube portion (260) is connected to the second tube portion (270), an inner space of the first tube portion (260) and an inner space of the second tube portion (270) are independent from each other, the spray hole (210) is opened to the first tube portion (260), the communication hole (220) is opened to the second tube portion (270), and the liquid tube (400) is configured to supply a part of liquid refrigerant into the first tube portion (260) and another part of liquid refrigerant into the second tube portion (270).

6. The tank heat exchanger according to claim 5, wherein one end of the liquid pipe (400) extends into the second cylinder portion (270), 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 an inner space of the first cylinder portion (260).

7. The tank heat exchanger according to claim 6, wherein the tank heat exchanger (10) further comprises a control valve (420), the control valve (420) being arranged at the bypass hole (430) or on the bypass branch (410), the control valve (420) being adapted to control the liquid pipe (400) to be connected to or disconnected from the inner space of the first tube portion (260).

8. The tank heat exchanger according to claim 6, wherein the first tube portion (260) is located above the second tube portion (270), the outer tube (100) includes an outer tube top wall (120), an outer tube side wall (130), and an outer tube bottom wall (140), an upper end of the first tube portion (260) is closed by the outer tube top wall (120), a lower end of the second tube portion (270) is closed by the outer tube bottom wall (140), the first tube portion (260) includes a first tube portion bottom wall (261), an upper end of the second tube portion (270) is closed by the first tube portion bottom wall (261), and one end of the liquid tube (400) extends into the second tube portion (270) through the first tube portion bottom wall (261).

9. The tank heat exchanger according to claim 6, wherein the outer tube (100) includes an outer tube top wall (120), an outer tube side wall (130), and an outer tube bottom wall (140), the second tube portion (270) extends from a plane where the outer tube top wall (120) is located to the outer tube bottom wall (140) along an axial direction of the outer tube (100), and the first tube portion (260) is sleeved on an upper portion of the second tube portion (270).

10. The tank heat exchanger according to claim 9, wherein an upper end of the first tube portion (260) is closed by the outer tube top wall (120).

11. The tank heat exchanger according to claim 9, wherein an upper end of the first tube portion (260) protrudes out of the outer tube top wall (120).

12. The tank heat exchanger according to claim 5, wherein the cross-sectional area of the first tube portion (260) is larger than the cross-sectional area of the second tube portion (270).

13. The tank 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) forms an angle with the horizontal plane.

14. Tank heat exchanger according to claim 1, characterized in that the gas pipe (500) is located above the spray holes (210) in the height direction of the tank heat exchanger (10).

15. A heat pump system, characterized by comprising a tank heat exchanger (10) according to any of claims 1-14.