Shell and tube heat exchanger, heat pump system and air conditioner

Abstract

The utility model discloses a shell and tube heat exchanger, a heat pump system and an air conditioner. The shell and tube heat exchanger comprises a barrel, a heat exchange tube and at least one flow guide piece. The barrel comprises a heat exchange cavity for containing refrigerant fluid, a liquid passing connector and a gas passing connector. And the liquid passing interface, the ventilation interface and the ventilation interface are communicated with the heat exchange cavity. The connector is connected between the first side and the second side. The liquid passing connector is close to the first side and arranged at the bottom of the connecting body. The ventilation connector is arranged on the top of the connector close to the second side. And the heat exchange pipe is fixedly arranged in the heat exchange cavity. The heat exchange pipe is provided with a refrigerating fluid channel so that refrigerating fluid can be matched with refrigerant fluid in a heat exchange mode. And the at least one flow guide piece is arranged in the heat exchange cavity. The flow guide piece abuts against at least part of the connecting body and is arranged opposite to the liquid passing connector or the ventilation connector. The flow guide part is used for guiding refrigerant fluid to flow in the heat exchange cavity. According to the shell and tube heat exchanger, full heat exchange can be achieved, and the heat exchange quality is improved.

Description

Technical Field

[0001] The present application relates to the field of air conditioning manufacturing, and in particular to a shell and tube heat exchanger, a heat pump system and an air conditioner. Background Art

[0002] In the related art, the cooling or heating function of the air conditioner is realized by a heat pump system. In the heat pump system in the related art, a heat exchanger is often provided to exchange heat with a refrigerant such as a refrigerant fluid to absorb or release heat, thereby realizing cooling or heating.

[0003] However, the heat exchange effect of the heat exchanger in the related art is poor due to the flow properties of the refrigerant fluid, and a large amount of oil and gas mixture is likely to enter the compressor, thereby causing unstable operation of the heat pump system. Utility Model Content

[0004] The present application provides a shell and tube heat exchanger, a heat pump system and an air conditioner. The shell and tube heat exchanger in the present application is conducive to achieving sufficient heat exchange and improving the heat exchange quality.

[0005] The technical solution is as follows:

[0006] According to a first aspect of an embodiment of the present application, a shell and tube heat exchanger is provided, comprising a cylinder, a heat exchange tube, and at least one flow guide.

[0007] The cylinder includes a heat exchange chamber for accommodating a refrigerant fluid, a liquid interface, and a ventilation interface. The liquid interface, the ventilation interface, and the ventilation interface are in communication with the heat exchange chamber. The cylinder also includes a first side and a second side spaced apart along the axial direction of the cylinder, and a connector. The connector is connected and disposed between the first side and the second side. The liquid interface is disposed close to the first side and is disposed at the bottom of the connector. The ventilation interface is disposed close to the second side and is disposed at the top of the connector. The refrigerant fluid enters the heat exchange chamber through the liquid interface and the ventilation interface.

[0008] The heat exchange tube is fixed in the heat exchange cavity and is provided with a refrigerant channel so that the refrigerant can cooperate with the refrigerant fluid in heat exchange.

[0009] At least one flow guide is arranged in the heat exchange cavity, the flow guide abuts against at least part of the connector, and is arranged opposite to the liquid interface or the air interface, and is used to guide the refrigerant fluid to flow in the heat exchange cavity.

[0010] The technical solution provided by the embodiments of the present application may have the following beneficial effects:

[0011] By arranging the refrigerant in the heat exchange tube to cooperate with the refrigerant fluid for heat exchange, the refrigerant fluid and the refrigerant can absorb or release heat. The setting of the guide piece is arranged relative to the liquid interface or the ventilation interface, so that the fluid entering from the liquid interface or the ventilation interface can enter the heat exchange tube for sufficient heat exchange through the guiding effect of the guide piece. It can be understood that the flow rate of the liquid interface or the ventilation interface is relatively fast. In this way, different from setting the guide piece in other positions, setting the guide piece relative to the liquid interface or the ventilation interface is conducive to more directly slowing down the flow rate of the fluid and guiding it to the heat exchange tube for heat exchange, which is conducive to improving the quality of heat exchange.

[0012] The technical solution is further described below:

[0013] In one embodiment, at least one flow guide comprises a first flow guide. The first flow guide is disposed at the bottom of the heat exchange chamber. The first flow guide is disposed opposite to the liquid interface so that at least part of the refrigerant fluid is heat-transferred through the liquid interface, the first flow guide and the heat exchange tube in sequence.

[0014] And / or, at least one flow guide includes a second flow guide, which is arranged at the top of the heat exchange chamber; the second flow guide is arranged relative to the ventilation interface so that at least part of the refrigerant fluid passes through the liquid interface, the heat exchange tube, the second flow guide and the ventilation interface in sequence.

[0015] In one embodiment, the first flow guide comprises a first plate body and a plurality of small holes arranged at intervals on the first plate body. One side of the first plate body is arranged close to the first side and connected to the liquid interface, and the other side of the first plate body is arranged close to the second side and connected to the inner side wall of the cylinder. The heat exchange tube is arranged above the first plate body. The liquid interface is arranged below the first plate body and connected to the first plate body.

[0016] In one embodiment, the second flow guide comprises a second plate body, on which a plurality of small holes are arranged at intervals. The second plate body is arranged at least partially opposite to the ventilation interface, and extends in the axial direction close to the first side and is connected to the inner side wall of the cylinder body.

[0017] In one of the embodiments, the cylinder also includes a gas-liquid interface. At least one flow guide also includes a third plate and an oil storage cavity. The gas-liquid interface is adjacent to the ventilation interface and is spaced apart at the top of the cylinder. One end of the third plate is connected to the gas-liquid interface, and the other end is connected to the oil storage cavity, so that the oil storage cavity receives and stores the liquid-phase refrigerant fluid on the third plate. The third plate is bent and connected to the second plate, and the third plate is arranged opposite to the ventilation interface, so that at least part of the refrigerant fluid is transferred to the heat exchange tube through the gas-liquid interface, the third plate, the second plate in sequence;

[0018] And / or, the cylinder further includes a liquid outlet, which is arranged at the bottom of the cylinder and is arranged adjacent to the liquid connection interface. The liquid outlet includes an open state and a closed state. When the liquid outlet is in the open state, the liquid outlet is connected to the heat exchange cavity so that the refrigerant fluid is discharged through the liquid outlet; when the liquid outlet is in the closed state, the liquid outlet is not connected to the heat exchange cavity.

[0019] In one embodiment, the heat exchange tube, the first flow guide and the second flow guide are all arranged along the axial direction of the cylinder. The heat exchange tube is fixedly arranged in the heat exchange cavity below the axial direction, so that the distance between the heat exchange tube and the first flow guide is smaller than the distance between the heat exchange tube and the second flow guide.

[0020] And / or, the ratio of the first height from the heat exchange tube to the bottom of the heat exchange chamber to the second height from the heat exchange tube to the top of the heat exchange chamber is 1 / 3 to 2. The bottom of the heat exchange chamber and the top of the heat exchange chamber are located on the same vertical line, and the vertical line is perpendicular to the axial direction.

[0021] According to a second aspect of an embodiment of the present application, a heat pump system is provided, comprising a compressor, an oil separator, a multi-way valve, a first throttling member, a first heat exchanger, and the shell and tube heat exchanger in the above embodiment. The oil separator comprises a first input portion and a first output portion, and the first heat exchanger comprises a first refrigerant input end and a first refrigerant output end.

[0022] The heat pump system includes a cooling mode. When the heat pump system is in the cooling mode, the outlet end of the compressor, the first input part, the first output part, the first end of the multi-way valve, the second end of the multi-way valve, the first refrigerant input end, the first refrigerant output end, the first throttling element, the liquid interface, the air interface and the inlet end of the compressor are sequentially connected to form a first refrigerant circuit.

[0023] When the heat pump system is in cooling mode, the heat exchange tube is set to heating mode so that the refrigerant fluid absorbs heat from the freezing liquid. The first heat exchanger is used to condense the refrigerant fluid.

[0024] The technical solution provided by the embodiments of the present application may have the following beneficial effects:

[0025] The refrigerant fluid comes out of the compressor as a high-temperature and high-pressure gas-phase refrigerant fluid and passes through the oil-gas separator, so that the refrigerant fluid before entering the first heat exchanger is in a gaseous state, ensuring the condensation efficiency and condensation effect of the first heat exchanger. Furthermore, after condensation in the first heat exchanger, the refrigerant fluid becomes a medium-temperature and high-pressure liquid-phase refrigerant fluid and enters the shell-and-tube heat exchanger for evaporation and heat absorption, so that the liquid-phase refrigerant fluid becomes a low-temperature gas-phase refrigerant fluid and flows back to the compressor. At this time, the refrigerant fluid absorbs the heat of the refrigerant liquid, so that the refrigerant liquid freezes the air and blows cold air into the room to achieve refrigeration. The shell-and-tube heat exchanger in the above embodiment is arranged in the heat pump system, so that the heat exchange quality of evaporation is improved during the evaporation of the refrigerant fluid in the shell-and-tube heat exchanger, avoiding insufficient heat exchange caused by too fast flow rate, so that the refrigerant fluid that finally flows into the inlet end of the compressor is a low-temperature gas-phase refrigerant fluid, thereby improving the working stability of the compressor.

[0026] The technical solution is further described below:

[0027] In one embodiment, the heat pump system further includes a shut-off member and a second throttling member. The cylinder further includes a gas-liquid interface. The gas-liquid interface is adjacent to the ventilation interface and is spaced apart at the top of the cylinder. The shell and tube heat exchanger further includes a second flow guide member, which includes a second plate body provided with a plurality of small holes spaced apart, a third plate body, and an oil storage cavity. One end of the third plate body is connected to the gas-liquid interface, and the other end is connected to the oil storage cavity, so that the oil storage cavity receives and stores the liquid-phase refrigerant fluid on the third plate body. The third plate body is bent and connected to the second plate body, and the third plate body is arranged opposite to the ventilation interface, so that at least part of the refrigerant fluid is transferred to the heat exchange tube through the gas-liquid interface, the third plate body, the second plate body in sequence.

[0028] The shutoff member is arranged between the ventilation interface and the inlet end of the compressor. The second throttling member is arranged between the third end of the multi-way valve and the gas-liquid interface.

[0029] The heat pump system also includes a heating mode. When the heat pump system is in the heating mode, the outlet end of the compressor, the first input part, the first output part, the first end of the multi-way valve, the third end of the multi-way valve, the gas-liquid interface, the liquid interface, the first throttling element, the first refrigerant input end, the first refrigerant output end, the second end of the multi-way valve, the fourth end of the multi-way valve and the inlet end of the compressor are sequentially connected to form a second refrigerant circuit.

[0030] Wherein, when the heat pump system is in heating mode, the first heat exchanger is used to evaporate the refrigerant fluid, the shell and tube heat exchanger is set to cooling mode so that the refrigerant fluid releases heat to the freezing liquid, and the shut-off member is in a closed state. When the heat pump system is in cooling mode, the shut-off member is in an open state, and the third end of the multi-way valve or the second throttling member is in a closed state.

[0031] In one embodiment, the heat pump system further includes a liquid level meter, a liquid reservoir for storing refrigerant fluid, and a control module. The liquid reservoir is connected to the first refrigerant circuit and is used to transport the refrigerant fluid to the first refrigerant circuit. The liquid level meter is used to measure the liquid level of the refrigerant fluid in the heat exchange cavity. The control module controls the flow rate of the refrigerant fluid transported from the liquid reservoir to the shell and tube heat exchanger according to the liquid level;

[0032] And / or, the heat pump system further comprises a first pipeline and a first control valve, wherein the first pipeline is connected between the inlet end of the compressor and the liquid interface. The first control valve is connected to the first pipeline and is used to control the flow rate of the refrigerant fluid flowing back to the inlet end of the compressor through the first pipeline.

[0033] According to a third aspect of an embodiment of the present application, an air conditioner is provided, comprising a housing assembly and the heat pump system in the above embodiment.

[0034] The technical solution provided by the embodiments of the present application may have the following beneficial effects:

[0035] Through the setting of the heat pump system in the above embodiment, the heat exchange efficiency of the heat pump system can be improved, and through the setting of the oil-gas separator and the shell and tube heat exchanger, excessive liquid refrigerant fluid can be prevented from entering the compressor, which is beneficial to improving the stability of the heat pump system, thereby improving the stability of the air-conditioning operation, and improving the heat exchange efficiency of the air-conditioning, reducing the workload, and facilitating energy saving.

[0036] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0038] Figure 1 Schematic diagram of the structure of an air conditioner in one embodiment.

[0039] Figure 2 for Figure 1 Schematic diagram of the heat pump system shown in .

[0040] Figure 3 for Figure 2 Schematic diagram of the shell and tube heat exchanger shown in FIG.

[0041] Figure 4 for Figure 3 Side view of the shell and tube heat exchanger shown in .

[0042] Figure 5 for Figure 2 The structural diagram of the cooling mode is shown.

[0043] Figure 6 for Figure 3 A schematic structural diagram of a first flow guide member in an embodiment is shown.

[0044] Figure 7 for Figure 3 A schematic structural diagram of a first flow guide member in another embodiment is shown.

[0045] Figure 8 for Figure 2 The structural diagram of the heating mode is shown.

[0046] Description of reference numerals:

[0047] 10. Heat pump system; 100. Shell and tube heat exchanger; 110. Cylinder; 111. Heat exchange chamber; 112. Liquid interface; 113. Ventilation interface; 114. First side; 115. Second side; 116. Connector; 117. Gas-liquid interface; 118. Liquid outlet; 120. Heat exchange tube; 130. Guide; 131. First guide; 1311. First plate; 132. Second guide; 1321. Second plate; 1322. Third plate; 1323. Oil storage chamber; 200. Compressor; 300. Oil Separator; 310, first input part; 320, first output part; 400, multi-way valve; 410, first end; 420, second end; 430, third end; 440, fourth end; 500, first throttling device; 510, shut-off device; 520, second throttling device; 600, first heat exchanger; 610, first refrigerant input end; 620, first refrigerant output end; 630, liquid storage tank; 640, liquid level meter; 700, first refrigerant circuit; 800, second refrigerant circuit; 900, first pipeline; 20, shell assembly. DETAILED DESCRIPTION

[0048] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0049] In the related art, the heat pump system of the air conditioner often uses a shell and tube heat exchanger for heat exchange processing, and the shell and tube heat exchanger is often provided with two interfaces, one for ventilation and the other for liquid. Generally, the ventilation interface and the liquid interface have a faster flow rate at the location where the refrigerant fluid is connected. The refrigerant fluid with a faster flow rate passes through the shell and tube heat exchanger quickly and is unevenly distributed, which can easily lead to poor heat exchange efficiency and heat exchange quality of the shell and tube heat exchanger, which is not conducive to the cooling or heating performance of the air conditioner, and more energy needs to be spent on improving the heat exchange efficiency and the number of cycles, which wastes energy and is not conducive to energy saving.

[0050] Based on this, refer to the attached Figure 1 As shown, the present application provides a housing assembly 20 and a heat pump system 10. Figure 2 As shown, the heat pump system 10 includes a compressor 200, an oil separator 300, a multi-way valve 400, a first throttle 500, a first heat exchanger 600, and the shell and tube heat exchanger 100 in the above embodiment.

[0051] The oil separator 300 includes a first input portion 310 and a first output portion 320 , and the first heat exchanger 600 includes a first refrigerant input end 610 and a first refrigerant output end 620 .

[0052] Among them, refer to the attached Figures 3 to 4 As shown, the shell and tube heat exchanger 100 includes: a cylinder 110 , a heat exchange tube 120 and at least one flow guide 130 .

[0053] The cylinder 110 includes a heat exchange chamber 111 for accommodating a refrigerant fluid, a liquid interface 112, and a ventilation interface 113. The liquid interface 112, the ventilation interface 113, and the ventilation interface 113 are in communication with the heat exchange chamber 111. The cylinder 110 also includes a first side 114 and a second side 115 spaced apart along the axial direction of the cylinder 110, and a connector 116. The connector 116 is connected and disposed between the first side 114 and the second side 115. The liquid interface 112 is disposed close to the first side 114 and is disposed at the bottom of the connector 116, so that the refrigerant fluid can be led out of the heat exchange chamber 111 through the liquid interface 112. The ventilation interface 113 is disposed close to the second side 115 and is disposed at the top of the connector 116. The refrigerant fluid enters the heat exchange chamber 111 through the liquid interface 112 and the ventilation interface 113.

[0054] The heat exchange tube 120 is fixedly arranged in the heat exchange cavity 111. The heat exchange tube 120 is provided with a refrigerant passage so that the refrigerant can cooperate with the refrigerant fluid in heat exchange.

[0055] At least one flow guide 130 is disposed in the heat exchange chamber 111 . The flow guide 130 abuts against at least a portion of the connector 116 and is disposed opposite to the liquid interface 112 or the air interface 113 . The flow guide 130 is used to guide the refrigerant fluid to flow in the heat exchange chamber 111 .

[0056] Further, see Attachment Figure 5 As shown, the working mode of the shell and tube heat exchanger 100 in the heat pump system 10 is as follows: the heat pump system includes a cooling mode. When the heat pump system is in the cooling mode, the outlet end of the compressor--the first input part 310--the first output part 320--the first end 410 of the multi-way valve 400--the second end 420 of the multi-way valve 400--the first refrigerant input end 610--the first refrigerant output end 620--the first throttling member 500--the liquid interface 112--the ventilation interface 113--the inlet end of the compressor 200 are connected in sequence to form a first refrigerant circuit 700 (see Appendix 1). Figure 5 Wherein, when the heat pump system is in cooling mode, the heat exchange tube 120 is set to heating mode so that the refrigerant fluid absorbs heat from the refrigerant.

[0057] It can be understood that the refrigerant fluid comes out of the compressor 200 as a high-temperature and high-pressure gas-phase refrigerant fluid and passes through the oil-gas separator, so that the refrigerant fluid before entering the first heat exchanger 600 is in gaseous state, ensuring the condensation efficiency and condensation effect of the first heat exchanger 600. Furthermore, after condensation in the first heat exchanger 600, the refrigerant fluid becomes a medium-temperature and high-pressure liquid-phase refrigerant fluid and enters the shell and tube heat exchanger 100 for evaporation and heat absorption, so that the liquid-phase refrigerant fluid becomes a low-temperature gas-phase refrigerant fluid and flows back to the compressor 200. At this time, the refrigerant fluid absorbs the heat of the refrigerant liquid, so that the refrigerant liquid freezes the air and blows cold air into the room to achieve refrigeration. Among them, in the shell and tube heat exchanger 100, the flow rate of the liquid interface 112 or the ventilation interface 113 is generally relatively fast. In this way, unlike setting the guide member 130 at other positions, setting the guide member 130 relative to the liquid interface 112 or the ventilation interface 113 is beneficial to blocking the refrigerant fluid and more directly slowing down the flow rate of the fluid and guiding it to the heat exchange tube 120 for heat exchange, which is beneficial to achieve sufficient heat exchange, so that in the refrigeration mode, most of the oil fluid eventually flows into the oil storage area, and the gas-phase refrigerant fluid enters the input end of the compressor 200 through the ventilation interface 113 for recycling, avoiding excessive liquid-phase refrigerant fluid from entering the compressor 200, which is beneficial to improving the operating stability of the compressor 200 and the heat pump system 10.

[0058] It should be noted that the first heat exchanger 600 may be an outdoor heat exchanger, a dry coil heat exchanger, or a water-cooled condenser, etc., and no further limitation is given here.

[0059] In some embodiments, see the attached Figure 3As shown, at least one flow guide 130 includes a first flow guide 131. The first flow guide 131 is arranged at the bottom of the heat exchange chamber 111. The first flow guide 131 is arranged relative to the liquid interface 112, so that at least part of the refrigerant fluid is heat-transferred through the liquid interface 112, the first flow guide 131 and the heat exchange tube 120 in sequence. In this way, by relative arrangement of the first flow guide 131 and the liquid interface 112, the first flow guide 131 can reduce the flow rate of the refrigerant fluid flowing into the heat exchange chamber 111 from the liquid interface 112, and evenly distribute the refrigerant fluid in the heat exchange chamber 111, so that the refrigerant fluid flowing into the heat exchange tube 120 area for heat exchange with the refrigerant is evenly distributed and has a slow flow rate, which is conducive to sufficient heat exchange.

[0060] In some other embodiments, see the attached Figure 3 As shown, at least one guide member 130 includes a second guide member 132. The second guide member 132 is arranged at the top of the heat exchange chamber 111. The second guide member 132 is arranged relative to the ventilation interface 113, so that at least part of the refrigerant fluid is connected to the ventilation interface 113 through the liquid interface 112, the heat exchange tube 120, the second guide member 132 and the ventilation interface 113 in sequence. In this way, similarly, by the second guide member 132 and the ventilation interface 113 being arranged relative to each other, the air flow velocity entering the ventilation interface 113 through the second guide member 132 can be slowed down, thereby lengthening the heat exchange time with the heat exchange tube 120 and improving the heat exchange efficiency. Further, it is avoided that the refrigerant fluid mixed with oil and gas is not heat exchanged uniformly, and the liquid phase refrigerant fluid is reduced from entering the inlet end of the compressor 200 through the ventilation interface 113, thereby improving the operating stability of the compressor 200.

[0061] In some embodiments, the shell and tube heat exchanger 100 includes a first flow guide 131 and a second flow guide 132. The first flow guide 131 is disposed at the bottom of the heat exchange chamber 111, and is disposed opposite to the liquid interface 112. The second flow guide 132 is disposed at the top of the heat exchange chamber 111, and is disposed opposite to the ventilation interface 113. In this way, in the cooling mode, the liquid phase refrigerant fluid enters the first flow guide 131 through the liquid interface 112, and the first flow guide 131 blocks and slows down the flow rate, and the flow guide 130 guides the refrigerant fluid evenly, so that the refrigerant fluid in the heat exchange chamber 111 can fully exchange heat with the heat exchange tube 120, and a large amount of gas phase refrigerant fluid is generated at this time. Due to the small density of the gas, the gas phase refrigerant fluid tends to flow to the top of the heat exchanger, and the second flow guide 132 is disposed at the top of the heat exchanger to block the gas to slow down its flow rate, so that the heat exchange time is increased, and the solid line fully exchanges heat.

[0062] It should be noted that the relative arrangement of the flow guide 130 and the liquid interface 112 and the ventilation interface 113 specifically refers to relative installation in terms of orientation, and the flow guide 130 and the ventilation interface 113 or the liquid interface 112 may be in a connection relationship or a non-connection relationship. At the same time, the structure of the flow guide 130 may be a filter or other flow guide structure, which will be described later and will not be described in detail here.

[0063] In combination with any of the above-mentioned embodiments of the flow guide 130, the flow guide 130 may be a filter structure with a plurality of small holes. Figure 4 As shown, the first flow guide 131 includes a first plate body 1311 and a plurality of small holes arranged at intervals on the first plate body 1311. Among them, the heat exchange tube 120 and the gas-liquid interface 117 are both arranged above the first plate body 1311. The liquid interface 112 is arranged below the first plate body 1311 and connected to the first plate body 1311. It can be understood that at this time, the first flow guide 131 is directly connected to the liquid interface 112, so that the refrigerant fluid entering from the liquid interface 112 directly passes through the first flow guide 131 to reduce the flow rate. At this time, in order to increase the circulation speed of the refrigerant fluid from the first flow guide 131 to the heat exchange tube 120, the first flow guide 131 is provided with a plurality of small holes, and at this time, the plurality of small holes can be randomly and irregularly arranged, or neatly and regularly arranged. A plurality of small holes are provided in the first plate body 1311, so that the refrigerant fluid can be evenly distributed in the plurality of small holes, thereby increasing the heating area between the refrigerant fluid and the heat exchange tube 120, which is conducive to sufficient heat exchange.

[0064] It should be noted that the shape of the first plate body 1311 can be a circumferential plate body, or a long plate, or a combination of multiple shapes. Figure 6 As shown, one side of the first plate 1311 is disposed close to the first side 114 and connected to the liquid interface 112, and the other side of the first plate 1311 is disposed close to the second side 115 and connected to the inner wall of the cylinder 110. In this way, the first plate 1311 is in the shape of a long plate and extends toward the second side 115 in the axial direction, so that the refrigerant fluid can be uniformly distributed in the axial direction, and the uniformity of the distribution of the heat exchange tube 120 and the refrigerant fluid in the axial direction is improved, thereby improving the heat exchange efficiency.

[0065] In another example, refer to the attached Figure 7 As shown, the first plate body 1311 is arranged around the liquid interface 112. In this way, when the first plate body 1311 is a circumferential plate body, the refrigerant fluid and the heat exchange tube 120 can be evenly distributed in the vertical direction where the liquid interface 112 and the first plate body 1311 are located, thereby promoting uniform heat exchange of the refrigerant fluid in the heat exchange cavity 111, thereby improving the heat exchange efficiency.

[0066] In another specific implementation, the flow guide 130 may be a liquid barrier baffle. Specifically, in one example, the flow guide 130 is opposite to and spaced from the liquid interface 112 or the ventilation interface 113, wherein the flow guide 130 is spaced from at least part of the inner wall of the cylinder 110, so that the refrigerant fluid can flow through the gap in the liquid interface 112 or the ventilation interface 113. In this way, the liquid barrier baffle can reduce the flow rate of the refrigerant fluid to achieve sufficient heat exchange. Furthermore, in order to improve the uniformity and efficiency of the baffle baffle in guiding the refrigerant fluid, in some embodiments, the liquid barrier baffle can also be tilted along the direction of the heat exchange tube 120 or a flow guide structure can be set to increase the uniformity of the flow, which will not be explained in detail here.

[0067] In combination with any of the above-mentioned embodiments of the flow guide 130, see the attached Figure 2 As shown, the second flow guide 132 includes a second plate 1321, and a plurality of small holes are provided on the second plate 1321. The second plate 1321 is at least partially arranged opposite to the ventilation interface 113, and extends in the axial direction near the first side 114, and is connected to the inner wall of the cylinder 110. Similarly, in this way, the second plate 1321 is provided with a plurality of small holes, so that the non-small hole part can play a good blocking role for the refrigerant fluid mixed with oil and gas, and reduce the flow rate of the refrigerant fluid to fully exchange heat with the heat exchange tube 120. Further, the setting of the small holes can allow the gas-phase refrigerant fluid to smoothly pass through the second flow guide 132 into the ventilation interface 113, improve the ventilation efficiency, and thus improve the circulation efficiency.

[0068] In addition, by setting a plurality of small holes, the uniformity of the flow direction of the gas phase refrigerant fluid can be enhanced. It should be noted that the plurality of small holes can be arranged uniformly and regularly, or can be arranged irregularly and randomly. At the same time, the plurality of small holes can be arranged uniformly along the axial direction, or can be arranged in a concentrated and uneven manner, and no excessive restrictions are made here.

[0069] In combination with any of the above embodiments of the heat pump system 10, the heat pump system 10 further includes a heating mode. Figure 4 As shown, the cylinder 110 further includes a gas-liquid interface 117. The gas-liquid interface 117 is adjacent to the ventilation interface 113 and is spaced apart at the top of the cylinder 110. The heat pump system 10 further includes a shutoff member 510 and a second throttle member 520. The shutoff member 510 is disposed between the ventilation interface 113 and the inlet end of the compressor 200. The second throttle member 520 is disposed between the third end 430 of the multi-way valve 400 and the gas-liquid interface 117. When the heat pump system 10 is in the heating mode, see the attached Figure 8As shown, the outlet end of the compressor 200, the first input part 310, the first output part 320, the first end 410 of the multi-way valve 400, the third end 430 of the multi-way valve 400, the gas-liquid interface 117, the liquid interface 112, the first throttling member 500, the first refrigerant input end 610, the first refrigerant output end 620, the second end 420 of the multi-way valve 400, the fourth end 440 of the multi-way valve 400 and the inlet end of the compressor 200 are connected in sequence to form a second refrigerant circuit 800 (see Appendix 1). Figure 8 The solid line part in ).

[0070] When the heat pump system 10 is in the heating mode, the shell and tube heat exchanger 100 is set to the cooling mode so that the refrigerant fluid releases heat to the freezing liquid, and the shut-off member 510 is in the closed state. When the heat pump system 10 is in the cooling mode, the shut-off member 510 is in the open state, and the third end 430 of the multi-way valve 400 or the second throttle member 520 is in the closed state.

[0071] It can be understood that when the heat pump system 10 is in the heating mode, the working principle of the heat pump system 10 is as follows: the high-temperature and high-pressure refrigerant fluid output from the outlet end of the compressor 200 is initially separated into gas and liquid through oil-gas separation, so that the refrigerant fluid entering the fourth end 440 of the multi-way valve 400 is a high-temperature gas-phase refrigerant fluid, and the gas-phase refrigerant fluid is condensed and releases heat through the shell and tube heat exchanger 100 to heat the air, and the heating mode is achieved by blowing the hot air into the room. At this time, the high-temperature gas-phase refrigerant fluid passes through the shell and tube heat exchanger 100 and becomes a low-temperature and high-pressure liquid-phase refrigerant fluid, flows out from the liquid interface 112 and enters the first heat exchanger 600 for heat absorption and evaporation. Through the action of the throttling element, the low-temperature and high-pressure liquid-phase refrigerant fluid is converted into a low-temperature and low-pressure liquid-phase refrigerant fluid, and then enters the first heat exchanger 600 for evaporation and heat absorption, so that the low-temperature and low-pressure liquid-phase refrigerant fluid absorbs heat and becomes a medium-temperature and low-pressure gas-phase refrigerant fluid, and finally flows back to the inlet end of the compressor 200. At this time, the second refrigerant circuit 800 is circulated, and the first refrigerant circuit 700 is not circulated. In this way, by setting the gas-liquid interface 117 and the ventilation interface 113, when switching between the cooling mode and the heating mode, there is no need to change the matching relationship between the pipeline and the interface, and only the second throttle member 520 and the intercepting member 510 need to be switched between the open and closed states, which reduces the switching difficulty and is conducive to improving the switching efficiency.

[0072] Further, in a specific embodiment, see the attached Figure 4As shown, the shell and tube heat exchanger 100 further includes a second flow guide 132, a third plate 1322 and an oil storage cavity 1323. One end of the third plate 1322 is connected to the gas-liquid interface 117, and the other end is connected to the oil storage cavity 1323. The third plate 1322 is bent and connected to the second plate 1321, and the third plate 1322 is arranged opposite to the ventilation interface 113, so that at least part of the refrigerant fluid is heat-transferred to the heat exchange tube 120 through the gas-liquid interface 117, the third plate 1322, and the second plate 1321 in sequence. It is understandable that when the heat pump system 10 is in the heating mode, one end of the third plate 1322 is connected to the gas-liquid interface 117, so that the third plate 1322 can directly reduce the flow rate of the refrigerant fluid entering the gas-liquid interface 117, so that the first collision with the third plate 1322 occurs to separate the liquid-phase refrigerant fluid, and at this time, the liquid-phase refrigerant fluid can enter the oil storage chamber 1323 along the third plate 1322 by gravity. The gas-phase refrigerant fluid extends from the third plate 1322 to the second plate 1321, and at this time, the small holes help the gas-phase refrigerant fluid to be evenly distributed in the axial direction, and the gas-phase refrigerant fluid enters the heat exchange tube 120 through the non-small hole area to exchange heat with the refrigerant. When the heating mode ends, the refrigerant fluid in the oil storage chamber 1323 can be drawn out through a pipeline inserted at the gas-liquid interface 117 to achieve clean separation. In this way, through the third plate 1322 and the oil storage chamber 1323, the second guide member 132 can form a secondary guide effect in the heating mode, improve the uniformity of the refrigerant fluid distribution, and reduce the liquid phase refrigerant fluid entering the heat exchange tube 120 to cover the heat exchange tube 120 and ultimately affect the heat exchange effect.

[0073] It should be noted that the first throttle 500 may be an expansion valve, a control valve, etc. The shutoff 510 may be a shutoff valve, a one-way valve, etc. The second throttle 520 may be a one-way valve, a shutoff valve, an expansion valve, etc. No further limitation is made here.

[0074] In combination with any of the above embodiments of the cylinder 110, see the attached Figure 3 As shown, the cylinder 110 also includes a liquid outlet 118, which is arranged at the bottom of the cylinder 110 and is arranged adjacent to the liquid interface 112. The liquid outlet 118 includes an open state and a closed state. When the liquid outlet 118 is in the open state, the liquid outlet 118 is connected to the heat exchange cavity 111 so that the refrigerant fluid is discharged through the liquid outlet 118; when the liquid outlet 118 is in the closed state, the liquid outlet 118 is not connected to the heat exchange cavity 111. It can be understood that the liquid-phase refrigerant fluid is mostly deposited at the bottom of the cylinder 110. At this time, the liquid-phase refrigerant fluid in the shell and tube heat exchanger 100 is discharged in time through the setting of another liquid outlet 118, thereby reducing the accommodation burden in the shell and tube heat exchanger 100.

[0075] Furthermore, it is possible to avoid excessive liquid-phase refrigerant fluid affecting the heat exchange efficiency of the refrigerant fluid circulating in the heat exchange chamber 111 in the heating mode or the cooling mode, which is conducive to achieving sufficient heat exchange and improving the heat exchange efficiency. It should be noted that the mode switching between the open state and the closed state of the liquid outlet 118 does not depend on the switching between the heating mode and the cooling mode. It can be opened all the time, or the open state and the closed state can be adjusted according to actual use, and no excessive restrictions are made here.

[0076] In some embodiments, the heat exchange tube 120, the first flow guide 131, and the second flow guide 132 are all arranged along the axial direction of the cylinder 110. In this way, by arranging the heat exchange tube 120, the first flow guide 131, and the second flow guide 132 along the axial direction, it is beneficial to improve the distribution uniformity of the first flow guide 131 and the second flow guide 132 in the axial direction of the heat exchange tube 120, thereby facilitating sufficient heat exchange and optimizing the heat exchange quality. Further, the heat exchange tube 120 is fixedly arranged in the heat exchange cavity 111 below the axial direction, so that the spacing distance between the heat exchange tube 120 and the first flow guide 131 is smaller than the spacing distance between the heat exchange tube 120 and the second flow guide 132.

[0077] It is understandable that in the heating mode, the gas phase refrigerant fluid enters the second guide member 132 from the gas-liquid interface 117 to exchange heat with the heat exchange tube 120, and is finally discharged from the liquid interface 112. At this time, the flow direction of the refrigerant fluid is from top to bottom. Similarly, in the cooling mode, the flow direction of the refrigerant fluid is from bottom to top. In this way, the heat exchange tube 120 is arranged close to the bottom of the cylinder 110, so that in the heating mode, by utilizing the high density of the liquid phase refrigerant fluid, the medium-temperature liquid phase refrigerant fluid can be further cooled by the heat exchange tube 120 when it falls into the lower and middle part of the cylinder 110, so that the refrigerant fluid leaving the liquid interface 112 is in a low-temperature liquid phase fluid, thereby improving the adequacy of heat exchange and improving the utilization rate of the refrigerant fluid.

[0078] Furthermore, in the cooling mode, by utilizing the high density of the liquid-phase refrigerant fluid, a sufficiently large space can be left above the heat exchange tube 120 for secondary gas-liquid separation of the refrigerant fluid, thereby ensuring that most of the refrigerant fluid ultimately exiting the vent interface 113 is gas-phase refrigerant fluid.

[0079] Specifically, in a specific implementation mode, see the attached Figure 3 As shown, the ratio of the first height H1 from the heat exchange tube 120 to the bottom of the heat exchange chamber 111 to the second height H2 from the heat exchange tube 120 to the top of the heat exchange chamber 111 is 1 / 5 to 1 / 2. The bottom of the heat exchange chamber 111 and the top of the heat exchange chamber 111 are located on the same vertical line, and the vertical line is perpendicular to the axial direction. In this way, the setting ratio will not have much impact on the setting of the first flow guide 131, and at the same time, the heat exchange efficiency can be improved.

[0080] In conjunction with any of the above embodiments of the heat pump system 10, see the attached Figure 8 As shown, the heat pump system 10 also includes a first pipeline 900 and a first control valve. The first pipeline 900 is connected between the inlet end of the compressor 200 and the liquid interface 112 (or the liquid outlet 118). It can be understood that the stable operation of the tube compressor 200 needs to be achieved through oil-gas balance. When the compressor 200 compresses the refrigerant fluid into a high-temperature and high-pressure gas output, the lubricating oil of the compressor 200 will be output at the same time. As the number of cycles of the heat pump system 10 increases, the lubricating oil of the compressor 200 is reduced. At this time, the flow rate of the oil-divided fluid reflux in the shell and tube heat exchanger 100 is controlled through the first pipeline 900 and the first control valve, and finally refluxed to the compressor 200 for supplementation to ensure the stability of the operation of the compressor 200. In addition, there is no need to introduce additional lubricating oil, so that recycling is achieved, which is conducive to saving energy consumption.

[0081] In conjunction with any of the above embodiments of the heat pump system 10, see the attached Figure 2 and attached Figure 4 As shown, the heat pump system 10 also includes a liquid level meter 640, a liquid reservoir 630 for storing refrigerant fluid, and a control module. The liquid reservoir 630 is connected to the first refrigerant circuit 700 and is used to transport the refrigerant fluid to the first refrigerant circuit 700. The liquid level meter is used to measure the liquid level height of the refrigerant fluid in the heat exchange cavity 111. The control module controls the flow rate of the refrigerant fluid transported by the liquid reservoir 630 to the shell and tube heat exchanger 100 according to the liquid level height. In this way, the liquid level height of the refrigerant fluid in the heat exchanger is detected by the liquid level meter 640, so as to adjust the flow rate through the control module. It can be understood that when the liquid level height is greater than the preset value, the control module controls the liquid reservoir 630 to stop transporting the first refrigerant circuit 700; when the liquid level height is less than the preset value, the control module controls the liquid reservoir 630 to increase the transport to the first refrigerant circuit 700. In this way, the refrigerant flow in the heat pump system 10 can be balanced to maintain system stability.

[0082] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0083] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0084] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0085] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0086] It should be noted that when an element is referred to as being "fixed to", "disposed on", "fixed to" or "mounted on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0087] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0088] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application. The technical contents disclosed above can be used to make slight changes or modifications to equivalent implementation methods with equivalent changes. However, any simple modifications, equivalent changes and modifications made to the above implementation methods based on the technical essence of the present application without departing from the contents of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A shell and tube heat exchanger, characterized in that: include: The cylinder comprises a heat exchange cavity for accommodating a refrigerant fluid, a liquid interface and a ventilation interface; the liquid interface, the ventilation interface and the ventilation interface are in communication with the heat exchange cavity; The cylinder also includes a first side and a second side spaced apart in the axial direction of the cylinder, and a connector; the connector is connected and arranged between the first side and the second side; the liquid interface is arranged close to the first side and is arranged at the bottom of the connector; the ventilation interface is arranged close to the second side and is arranged at the top of the connector; the refrigerant fluid enters the heat exchange chamber through the liquid interface and the ventilation interface; A heat exchange tube is fixedly arranged in the heat exchange cavity; the heat exchange tube is provided with a refrigerant channel so that the refrigerant can cooperate with the refrigerant fluid in heat exchange; At least one flow guide is arranged in the heat exchange cavity; the flow guide abuts against at least a portion of the connector and is arranged opposite to the liquid interface or the ventilation interface; the flow guide is used to guide the refrigerant fluid to flow to the heat exchange tube.

2. The shell and tube heat exchanger according to claim 1, characterized in that: At least one flow guide comprises a first flow guide; the first flow guide is arranged at the bottom of the heat exchange cavity; the first flow guide is arranged opposite to the liquid interface, so that at least part of the refrigerant fluid sequentially passes through the liquid interface, the first flow guide and the heat exchange tube for heat transfer; And / or, at least one flow guide includes a second flow guide, which is arranged at the top of the heat exchange chamber; the second flow guide is arranged opposite to the ventilation interface so that at least part of the refrigerant fluid passes through the liquid interface, the heat exchange tube, the second flow guide and the ventilation interface in sequence.

3. The shell and tube heat exchanger according to claim 2, characterized in that: The first flow guide member includes a first plate body and a plurality of small holes arranged at intervals on the first plate body; one side of the first plate body is arranged close to the first side and connected to the liquid interface, and the other side of the first plate body is arranged close to the second side and connected to the inner wall of the cylinder; wherein the heat exchange tube is arranged above the first plate body; the liquid interface is arranged below the first plate body and connected to the first plate body.

4. The shell and tube heat exchanger according to claim 2, characterized in that: The second flow guide comprises a second plate body, on which a plurality of small holes are arranged at intervals; the second plate body is arranged at least partially opposite to the ventilation interface, and extends along the axial direction close to the first side, and is connected to the inner side wall of the cylinder.

5. The shell and tube heat exchanger according to claim 4, characterized in that: The cylinder also includes a gas-liquid interface; at least one guide member also includes a third plate and an oil storage cavity; the gas-liquid interface is adjacent to the ventilation interface and is spaced apart at the top of the cylinder; one end of the third plate is connected to the gas-liquid interface, and the other end is connected to the oil storage cavity, so that the oil storage cavity receives and stores the liquid-phase refrigerant fluid on the third plate; the third plate is bent and connected to the second plate, and the third plate is arranged opposite to the ventilation interface, so that at least part of the refrigerant fluid is transferred to the heat exchange tube through the gas-liquid interface, the third plate, the second plate in sequence; And / or, the cylinder also includes a liquid outlet, which is arranged at the bottom of the cylinder and is adjacent to the liquid interface; the liquid outlet includes an open state and a closed state; when the liquid outlet is in the open state, the liquid outlet is connected to the heat exchange chamber so that the refrigerant fluid is discharged through the liquid outlet; when the liquid outlet is in the closed state, the liquid outlet is not connected to the heat exchanger.

6. The shell and tube heat exchanger according to any one of claims 2 to 5, characterized in that: The heat exchange tube, the first flow guide and the second flow guide are all arranged along the axial direction of the cylinder; The heat exchange tube is fixedly disposed in the heat exchange cavity below the axial direction, so that the spacing distance between the heat exchange tube and the first flow guide is smaller than the spacing distance between the heat exchange tube and the second flow guide; And / or, the ratio of a first height from the heat exchange tube to the bottom end of the heat exchange chamber to a second height from the heat exchange tube to the top end of the heat exchange chamber is 1 / 3 to 2; wherein, the bottom end of the heat exchange chamber and the top end of the heat exchange chamber are located on the same vertical line, and the vertical line is perpendicular to the axial direction.

7. A heat pump system, characterized in that: The heat pump system comprises: A compressor, an oil separator, a multi-way valve, a first throttling device, a first heat exchanger, and the shell and tube heat exchanger according to any one of claims 1 to 6; the oil separator comprises a first input part and a first output part, and the first heat exchanger comprises a first refrigerant input end and a first refrigerant output end; The heat pump system includes a cooling mode; when the heat pump system is in the cooling mode, the outlet end of the compressor, the first input part, the first output part, the first end of the multi-way valve, the second end of the multi-way valve, the first refrigerant input end, the first refrigerant output end, the first throttling device, the liquid interface, the ventilation interface and the inlet end of the compressor are sequentially connected to form a first refrigerant circuit; Wherein, when the heat pump system is in the cooling mode, the heat exchange tube is set to the heating mode so that the refrigerant fluid absorbs heat from the freezing liquid, and the first heat exchanger is used to condense the refrigerant fluid.

8. The heat pump system according to claim 7, characterized in that: The heat pump system also includes a shut-off member and a second throttling member; the cylinder also includes a gas-liquid interface; the gas-liquid interface is adjacent to the ventilation interface and is spaced apart at the top of the cylinder; the shell and tube heat exchanger also includes a second flow guide member, the second flow guide member includes a second plate body, a third plate body and an oil storage cavity provided with a plurality of small holes spaced apart; one end of the third plate body is connected to the gas-liquid interface, and the other end is connected to the oil storage cavity, so that the oil storage cavity receives and stores the liquid-phase refrigerant fluid on the third plate body; the third plate body is bent and connected to the second plate body, and the third plate body is arranged opposite to the ventilation interface, so that at least part of the refrigerant fluid is heat-transferred to the heat exchange tube through the gas-liquid interface, the third plate body, the second plate body in sequence; The shut-off member is disposed between the ventilation interface and the inlet end of the compressor; the second throttling member is disposed between the third end of the multi-way valve and the gas-liquid interface; The heat pump system also includes a heating mode; when the heat pump system is in the heating mode, the outlet end of the compressor, the first input part, the first output part, the first end of the multi-way valve, the third end of the multi-way valve, the gas-liquid interface, the liquid interface, the first throttling device, the first refrigerant input end, the first refrigerant output end, the second end of the multi-way valve, the fourth end of the multi-way valve and the inlet end of the compressor are sequentially connected to form a second refrigerant circuit; Wherein, when the heat pump system is in the heating mode, the first heat exchanger is used to evaporate the refrigerant fluid, the shell and tube heat exchanger is set to the cooling mode so that the refrigerant fluid releases heat to the refrigerant, and the shut-off member is in a closed state; when the heat pump system is in the cooling mode, the shut-off member is in an open state, and the third end of the multi-way valve or the second throttling member is in a closed state.

9. The heat pump system according to claim 7, characterized in that: The heat pump system further includes a liquid level gauge, a liquid reservoir for storing liquid-phase refrigerant fluid, and a control module; the liquid reservoir is connected to the first refrigerant circuit and is used to transport the refrigerant fluid to the first refrigerant circuit; the liquid level gauge is used to measure the liquid level of the refrigerant fluid in the heat exchange cavity; the control module controls the flow rate of the refrigerant fluid transported by the liquid reservoir to the shell and tube heat exchanger according to the liquid level; And / or, the heat pump system also includes a first pipeline and a first control valve, the first pipeline is connected and arranged between the inlet end of the compressor and the liquid interface, the first control valve is connected and arranged in the first pipeline, and the first control valve is used to control the flow rate of the refrigerant fluid returning to the inlet end of the compressor through the first pipeline.

10. An air conditioner, characterized in that: The heat pump system comprises a shell assembly and the heat pump system according to any one of claims 7 to 9.

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