A heat pump system with a tube-and-tube fin heat exchanger

Abstract

The invention discloses a heat pump system with a sleeve-fin heat exchanger, which is composed of several compressors, four-way valves and throttling elements, and two sleeve-fin heat exchangers. The sleeve-fin heat exchanger has fins on the outside of the sleeve, and the inter-tube side and inner tube side of the sleeve are working medium or liquid flow channels, and are respectively provided with one or more working medium flow channels, each of which is connected to the compressor, four-way valve and throttling element to form an independent heat pump circuit and filled with an appropriate amount of working medium, and the liquid flow channel is connected to the configured external pipeline. In the heat pump system, the working medium exchanges heat with water and air at the same time, integrating the functions of heating and domestic hot water supply into a set of devices, effectively reducing the cost and installation space, and can also form more than two heat pump circuits, effectively improving the energy efficiency ratio of the heat pump under the condition of large heat exchange temperature difference.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of heat pump systems for building heating and hot water supply, in particular to a tube-and-tube fin heat exchanger and a heat pump system thereof, belonging to the technical field of heat pumps. Background Art

[0002] The district heating system is a centralized heating network that distributes heat from a centralized heat source to users. It is mostly used to solve the heat demand problems of individuals, family homes, commercial heating, and industrial processing processes. In order to save energy, the temperature of district heating has been reduced again and again. The temperature of hot water supplied by the widely used third-generation district heating system is about 90°C. In order to further recycle and utilize medium and low waste heat resources such as boiler exhaust to achieve the purpose of energy conservation and emission reduction, people have been studying or vigorously promoting the fourth-generation district heating system since the 21st century. The temperature of hot water supplied can be reduced to 70°C or even lower to 50°C, which greatly reduces the heat loss of the system and improves the heating efficiency. However, after the heating temperature of the fourth-generation district heating system is reduced, it can only provide direct heating, and cannot provide domestic hot water for bathing and other needs through heat exchange. It also needs to be equipped with heating equipment to provide domestic hot water. The heating heat pump with hot water supply as the heat source has become the preferred heating heat pump and is widely used in the fourth-generation system. In recent years, driven by the "dual carbon" goal, people have proposed the fifth-generation district heating system, that is, the ultra-low temperature district heating system, with a water supply temperature below 50°C, or even as low as 25°C, so that low-grade heat sources that were difficult to use in the past can be fully utilized, such as solar energy, environmental heat sources, data center waste heat, process cooling water, etc. Compared with the fourth-generation system, the characteristics of the fifth-generation system are as follows: 1) The water supply of the heating network cannot be directly used for heating. In addition, the temperature difference between heating and hot water supply is large and the demand for domestic hot water is highly random, so two sets of warming heat pumps are required; 2) The heating network can also be used for cooling at the same time. The waste heat generated during cooling can be used or dispersed by cooling towers and other equipment. Therefore, for the fifth-generation system, the advantages of energy saving, emission reduction and saving of pipe network construction costs are very obvious, and the problems brought are also more prominent. For example, if users configure two sets of warming systems, it will bring about a large increase in construction cost and installation space. When making domestic hot water or heating in cold weather, the heat pump temperature rise is large, that is, the heat exchange temperature difference is large, which will seriously reduce the energy efficiency ratio of the heat pump.

[0003] In order to solve the problems existing in the above-mentioned district heating system warming heat pump, the technical solution of the present invention is designed. Summary of the invention

[0004] The purpose of the present invention is to address the problems existing in the above-mentioned prior art and provide a heat exchanger with a sleeve-fin type heat exchanger and a heat pump system thereof, which can simultaneously exchange heat between water and air and the working medium of a heat pump, has a compact structure, and significantly improved energy efficiency. The present invention designs a sleeve-fin type heat exchanger, in which the working medium can exchange heat with water and air at the same time, and can integrate two heating systems, a heating heat pump and a domestic hot water heat pump, into a set of devices, solving the problems of high cost and large installation size caused by the separation of the heating heat pump and the domestic hot water heat pump; the sleeve-fin type heat exchanger is provided with more than two working medium flow paths, and forms more than two heat pump circuits with other components of the heat pump, so that the heat exchange temperature difference borne by each circuit can be reduced, solving the problem of low energy efficiency ratio of the heat pump under large temperature rise conditions.

[0005] In order to achieve the above-mentioned purpose of the invention, the technical solution of the present invention is implemented in the following ways:

[0006] A heat exchanger with sleeve-fin type and its heat pump system, which consists of several compressors 1, four-way valves 2 and throttling elements 3, and two sleeve-fin type heat exchangers. The sleeve of the sleeve-fin type heat exchanger is provided with fins on the outer side of the sleeve, and the inter-tube side and inner tube side of the sleeve are working medium or liquid flow channels. The sleeve-fin type heat exchanger is respectively provided with one or more working medium flow paths and liquid flow paths, and each working medium or liquid flow path is collected on its inlet and outlet headers. One working medium flow path of each of the two sleeve-fin type heat exchangers is connected to the compressor 1, the four-way valve 2 and the throttling element 3 through its inlet and outlet headers to form an independent heat pump circuit, and the heat pump circuit is filled with an appropriate amount of working medium. The number of working medium flow paths arranged in the two sleeve-fin type heat exchangers is the same as the number of corresponding heat pump circuits, and the liquid flow path is connected with the configured liquid pipeline through its inlet and outlet headers.

[0007] Two tube-and-tube fin heat exchangers A tube-and-tube heat exchanger includes a first tube-and-tube fin heat exchanger 4 and a second tube-and-tube fin heat exchanger 5; the first tube-and-tube fin heat exchanger 4 is provided with two working medium flow paths and a liquid flow path, which is composed of an outer tube 401, an inner tube 402, an inner tube elbow 403, an outer tube elbow A 404, a liquid upper header 405 and a liquid lower header 414, fins 406, an upper header 407 for the working medium flow path and a lower header 416 for the working medium flow path, a right frame 408, an upper frame 409, an outer tube elbow B 410, a left frame 411, a lower frame 412, a lower header 413 for the working fluid flow path 2 and an upper header 415 for the working fluid flow path 2, and the structure is as follows: the outer tube 401 is arranged into a tube array according to a certain rule, and a plurality of fins 406 are strung on the outside of the outer tube 401; the tube array of the outer tube 401 is supported between the left frame 411 and the right frame 408 and tightly connected together; the inner tube 402 is prefabricated into a U-shaped tube and penetrates into the outer tube 401 to form a sleeve, and the outer tube bend B410 is pre-inserted into the U-shaped tube bend of the inner tube 402; the inner tube 402 at the opening of the U-shaped tube passes through the outer tube 401, and the outer tube 402 is pre-inserted into the U-shaped tube bend of the inner tube 402. The outer tube bend A404 and the outer tube bend B410 connect the outer tube 401 into several branches according to the required rules, and collect them in the upper header 407 of the working fluid flow path 1 and the lower header 416 of the working fluid flow path 1 and the upper header 415 of the working fluid flow path 2 and the lower header 413 of the working fluid flow path 2; the inner tube bend 403 connects the inner tube 402 into several branches according to the required rules and collects them in the upper liquid header 405 and the lower liquid header 414; the upper frame 409 and the lower frame 412 are respectively connected to the right frame 408 and the left frame 411 to form an installation frame. The composition and structure of the second tube-and-fin heat exchanger 5 are similar to or similar to the first tube-and-fin heat exchanger 4.

[0008] A heat pump circuit with two casings is composed of a first compressor 1A and a second compressor 1B, a first four-way valve 2A and a second four-way valve 2B, a first throttling element 3A and a second throttling element 3B, a first casing fin heat exchanger 4, a second casing fin heat exchanger 5, a distributor a6, a distributor b7, a distributor c8, a distributor d9, a fan A10 and a fan B11, etc. The fin sides of the first shell-and-tube-fin heat exchanger 4 and the second shell-and-tube-fin heat exchanger 5 are equipped with fans A10 and B11. The working fluid flow path 1 of the first shell-and-tube-fin heat exchanger 4 and the working fluid flow path 2 of the second shell-and-tube-fin heat exchanger 5 pass through distributor a6 and distributor d9 respectively, and are connected to the first compressor 1A, the first four-way valve 2A, and the first throttling element 3A as a heat pump circuit A; the working fluid flow path 2 of the first shell-and-tube-fin heat exchanger 4 and the working fluid flow path 1 of the second shell-and-tube-fin heat exchanger 5 pass through distributor b7 and distributor c8 respectively, and are connected to the second compressor 1B, the second four-way valve 2B, and the second throttling element 3B as a heat pump circuit B; the first shell-and-tube-fin heat exchanger 4 and the second shell-and-tube-fin heat exchanger 5 are configured with one or two liquid flow paths, and the liquid flow paths may be the same or different.

[0009] A heat exchanger with a sleeve-and-tube fin type and a heat pump system thereof, wherein the sleeve of the sleeve-and-tube fin type heat exchanger can be a structure suitable for forced convection or natural convection, such as a tube-and-tube fin type, a tube-rolled fin type or a tube-wound fin type; the fins can also be omitted, the outer tube can be a single tube arranged in a regular pattern and then connected to form a flow path with a bend, or can be first processed into a U-shaped tube or an S-shaped tube and then connected to form a flow path with a bend, and the inner tube built into the fin tube can be a single tube or multiple tubes, and the connection method at both ends should be adapted to the connection method of the fin tube.

[0010] A heat exchanger with a tube-and-fin type and a heat pump system thereof, wherein the flow path arrangements of two tube-and-fin type heat exchangers can be the same or different.

[0011] A heat exchanger with sleeve fins and a heat pump system thereof, wherein the four-way valve can be omitted, the throttling element can be a throttling tube, a throttling hole, a throttling valve or an expansion valve, and the compressor can be an independent compressor or a compressor cylinder with independent suction and exhaust.

[0012] A heat exchanger with a tube-and-fin type and a heat pump system thereof. The inner tube and the inter-tube flow passage of the tube-and-fin type heat exchanger can carry liquid and working fluid respectively, or can carry working fluid and liquid respectively. The working fluid is R134a, R410A, R32, R290 or R600a that meets environmental protection requirements, and the fluid can be water, antifreeze or synthetic fluid, etc. The working fluids used in different heat pump circuits can be the same or different, and the fluids used in different liquid flow passages can be the same or different.

[0013] A heat exchanger with a tube-and-fin type and a heat pump system thereof, wherein in the first tube-and-fin type heat exchanger 4, the outer tube 401 can be prefabricated into a U-shaped tube, in which case the outer tube bend B410 can be omitted, the U-shaped tube opening of the inner tube 402 passes through the U-shaped tube bend of the outer tube 401, and the other end of the outer tube 401 passes through the outer tube bend A404.

[0014] A heat exchanger with sleeve fins and a heat pump system thereof, wherein the distributor thereof can be a component formed by connecting four two-way valves or single-phase valves, or two three-way valves according to the principle of consistent flow direction in the working medium flow path.

[0015] For the above-mentioned heat exchanger with shell and tube fins and its heat pump system, the inter-tube and inner tube channels of the shell of the shell and tube fin heat exchanger can flow through the working fluid and water, and the air can flow through the fin side, so that the working fluid can exchange heat with water and air at the same time, and the two sets of warming heat pump systems for heating and domestic hot water can be integrated into a set of devices, so that the cost and installation space of the warming heat pump can be effectively reduced; two or more working fluid flow paths are arranged on the shell and tube fin heat exchanger, and more than two heat pump circuits are formed with other components of the heat pump. Each circuit can be equipped with a suitable working fluid and jointly bear the total temperature rise of the heat pump, so that the heat exchange temperature difference borne by each circuit can be reduced, effectively improving the energy efficiency ratio of the heat pump. In addition, the heat pump adjusts the number of operating circuits according to the heating demand, that is, a single circuit is operated when the demand is small, and a large number of circuits are operated when the demand is large, which can effectively reduce the annual power consumption of the heat pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0017] Figure 1 It is a system diagram of embodiment 1 of the present invention.

[0018] Figure 2 It is a front view of a tube-fin heat exchanger according to an embodiment of the present invention.

[0019] Figure 3 It is a right side view of a tube-fin heat exchanger according to an embodiment of the present invention.

[0020] Figure 4 It is a left side view of the shell and tube fin heat exchanger of the first embodiment of the present invention.

[0021] Figure 5 It is a system diagram of embodiment 2 of the present invention.

[0022] Figure 6 It is a front view of the tube-and-fin heat exchanger according to the second embodiment of the present invention.

[0023] Figure 7 It is a right side view of the tube-and-fin heat exchanger according to the second embodiment of the present invention.

[0024] Figure 8It is a system diagram of embodiment 3 of the present invention.

[0025] Fig. 9 It is a front view of the tube-and-fin heat exchanger according to the third embodiment of the present invention.

[0026] Fig.10 It is a right side view of the tube-and-fin heat exchanger according to the third embodiment of the present invention.

[0027] Fig.11 It is a system diagram of embodiment 4 of the present invention.

[0028] Fig.12 It is a front view of a fourth tube-and-fin heat exchanger according to embodiment of the present invention.

[0029] Fig.13 It is a right side view of the fourth tube-fin heat exchanger of the embodiment of the present invention.

[0030] In the figure: 1A, 1B—compressors, 2A, 2B—four-way valves, 3A, 3B—throttling elements, 4—first tube-and-fin heat exchanger, 5—second tube-and-fin heat exchanger, 6—distributor a, 7—distributor b, 8—distributor c, 9—distributor d, 10—fan A, 11—fan B.

[0031] The first tube-and-fin heat exchanger 4 for fluid A is constructed as follows: 401—outer tube, 402—inner tube, 403—inner tube elbow, 404—outer tube elbow A, 405—liquid upper header, 406—fin, 407—working fluid flow path one upper header, 408—right frame, 409—upper frame, 410—outer tube elbow B, 411—left frame, 412—lower frame, 413—working fluid flow path two lower header, 414—liquid lower header, 415—working fluid flow path two upper header, 416—working fluid flow path one lower header, 417—liquid middle upper header, 418—liquid middle lower header.

[0032] The second tube-and-fin heat exchanger 5 for fluid B is constructed as follows: 501—outer tube, 502—inner tube, 503—inner tube elbow, 504—outer tube elbow A, 505—liquid upper header, 506—fin, 507—working fluid flow path one upper header, 508—right frame, 509—upper frame, 510—outer tube elbow B, 511—left frame, 512—lower frame, 513—working fluid flow path two lower header, 514—liquid lower header, 515—working fluid flow path two upper header, 516—working fluid flow path one lower header, 517—liquid middle upper header, 518—liquid middle lower header.

[0033] The valves of the distributor a 6 are as follows: 61—upper valve a, 62—middle upper valve a, 63—middle lower valve a, 64—lower valve a.

[0034] The valves of distributor b7 are as follows: 71—upper valve b, 72—middle upper valve b, 73—middle lower valve b, 74—lower valve b.

[0035] The valves of the distributor c8 are as follows: 81—upper valve c, 82—middle upper valve c, 83—middle lower valve c, 84—lower valve c.

[0036] The valves of the distributor d9 are as follows: 91—upper valve d, 92—middle upper valve d, 93—middle lower valve d, 94—lower valve d. DETAILED DESCRIPTION

[0037] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0038] Embodiment 1

[0039] refer to Figure 1 This embodiment is a heat pump system using a double-flow-path working medium and a single-flow-path inner tube liquid shell-and-tube fin heat exchanger. The heat pump system is composed of compressors 1A and 1B, four-way valves 2A and 2B, throttling elements 3A and 3B, a first shell-and-tube fin heat exchanger 4, a second shell-and-tube fin heat exchanger 5, distributors a6, b7, c8, d9, fans A10 and B11. The first tube-and-tube fin heat exchanger 4 and the second tube-and-tube fin heat exchanger 5 are both composed of a working fluid flow path 1, a working fluid flow path 2 and a liquid flow path, and fans A10 and B11 are installed on the fin side thereof; the inner tube of the tube forms a liquid flow path, which is connected to the fluid A and fluid B pipelines respectively, and fluid A can be indoor domestic hot water, and fluid B can be supplied heat source water, which flow in the inner tubes of the first tube-and-tube fin heat exchanger 4 and the second tube-and-tube fin heat exchanger 5 respectively; fans A10 and B11 drive indoor air and indoor exhaust air or outdoor air to pass through the fin side of the first tube-and-tube fin heat exchanger 4 and the second tube-and-tube fin heat exchanger 5; the outer tube and inner tube of the tube Two working fluid paths are formed between the tubes, namely, the upper working fluid path 1 and the lower working fluid path 2. The working fluid path 1 of the first tube-and-fin heat exchanger 4 and the working fluid path 2 of the second tube-and-fin heat exchanger 5 pass through the distributor a6 and the distributor d9 respectively, and are connected to the compressor 1A, the four-way valve 2A, and the throttling element 3A to form a heat pump circuit A, and the working fluid thereof can be R134a; the working fluid path 2 of the first tube-and-fin heat exchanger 4 and the working fluid path 1 of the second tube-and-fin heat exchanger 5 pass through the distributor b7 and the distributor c8 respectively, and are connected to the compressor 1B, the four-way valve 2B, and the throttling element 3B to form a heat pump circuit B, and the working fluid thereof can be R410A or R32.

[0040] See also Figure 2 , Figure 3 and Figure 4The first tube-and-fin heat exchanger 4 is composed of an outer tube 401, an inner tube 402, an inner tube elbow 403, an outer tube elbow A 404, a liquid upper header 405 and a liquid lower header 414, fins 406, an upper header 407 for a working fluid flow path and a lower header 416 for a working fluid flow path, a right frame 408, an upper frame 409, an outer tube elbow B 410, a left frame 411, a lower frame 412, a lower header 413 for the working fluid flow path 2 and an upper header 415 for the working fluid flow path 2, and the structure is as follows: the outer tube 401 is arranged into a tube array according to a certain rule, and a plurality of fins 406 are strung on the outside thereof, and the tube array of the outer tube 401 is supported between the left frame 411 and the right frame 408 and is tightly connected together; the inner tube 402 is prefabricated into a U-shaped tube and penetrates into the outer tube 401 to form a sleeve, and the outer tube bend B410 is pre-inserted into the U-shaped tube bend of the inner tube 402, and the inner tube 402 passes through the outer tube bend A4 at the opening of the U-shaped tube. 04; the outer tube bend A404 and the outer tube bend B410 connect the outer tube 401 into several branches according to the required rules and collect them in the upper header 407 of the working fluid flow path one and the lower header 416 of the working fluid flow path and the upper header 415 of the working fluid flow path two and the lower header 413 of the working fluid flow path two; the inner tube bend 403 connects the inner tube 402 into several branches according to the required rules and collects them in the upper liquid header 405 and the lower liquid header 414; the upper frame 409 and the lower frame 412 are respectively connected to the right frame 408 and the left frame 411 to form an installation frame.

[0041] The composition and structure of the second tube-and-fin heat exchanger 5 are the same or similar to those of the fluid A tube-and-fin heat exchanger 4 .

[0042] The distributor a6 is composed of an upper valve a61, a middle upper valve a62, a middle lower valve a63 and a lower valve a64, and is connected in the following manner: the upper valve a61 and one end of the middle upper valve a62 are connected in parallel to an upper header 407 of the working fluid flow path, and the middle lower valve a63 and one end of the lower valve a64 are connected in parallel to a lower header 416 of the working fluid flow path; the other end of the upper valve a61 and the middle lower valve a63 are connected in parallel to the right side pipe of the four-way valve 2A, and the other end of the middle upper valve a62 and the other end of the lower valve a64 are connected in parallel to one end of the throttling element 3A.

[0043] The distributor b7 is composed of an upper valve b71, a middle upper valve b72, a middle lower valve b73 and a lower valve b74, and its connection method is as follows: the upper valve b71 and one end of the middle upper valve b72 are connected in parallel to the upper header 415 of the working fluid flow path 2, and the middle lower valve b73 and one end of the lower valve b74 are connected in parallel to the lower header 413 of the working fluid flow path 2; the other end of the upper valve b71 and the middle lower valve b73 are connected in parallel to the left side pipe of the four-way valve 2B, and the other end of the middle upper valve b72 and the other end of the lower valve b74 are connected in parallel to one end of the throttling element 3B.

[0044] The distributor c8 is composed of an upper valve c81, a middle upper valve c82, a middle lower valve c83 and a lower valve c84, and its connection method is as follows: the upper valve c81 and one end of the middle upper valve c82 are connected in parallel to an upper header 507 of the working fluid flow path, and the middle lower valve c83 and one end of the lower valve c84 are connected in parallel to a lower header 516 of the working fluid flow path; the other end of the upper valve c81 and the middle lower valve c83 are connected in parallel to the other end of the throttling element 3B, and the other end of the middle upper valve c82 and the other end of the lower valve c84 are connected in parallel to the right side pipe of the four-way valve 2B.

[0045] The distributor b9 is composed of an upper valve b91, a middle upper valve b92, a middle lower valve b93 and a lower valve b94, and its connection method is as follows: the upper valve b91 and one end of the middle upper valve b92 are connected in parallel to the upper manifold 515 of the working fluid flow path 2, and the middle lower valve b93 and one end of the lower valve b94 are connected in parallel to the lower manifold 513 of the working fluid flow path 2; the other end of the upper valve b91 and the middle lower valve b93 are connected in parallel to the other end of the throttling element 3A, and the other end of the middle upper valve b92 and the other end of the lower valve b94 are connected in parallel to the left side pipe of the four-way valve 2B.

[0046] The air intake and exhaust ports of compressor 1A of heat pump circuit A are connected to the finger pipe and main pipe of four-way valve 2A respectively, while the air intake and exhaust ports of compressor 1B of heat pump circuit B are connected to the finger pipe and main pipe of four-way valve 2B respectively.

[0047] Heat pump circuit A and heat pump circuit B respectively convert the working fluid flow direction through four-way valve 2A and four-way valve 2B to realize the conversion of its heating mode and cooling mode. When the heating mode is working, the heat source water of the second tube-fin heat exchanger 5 and / or the heat of the indoor exhaust air can be transferred to the first tube-fin heat exchanger 4, and the indoor air and domestic hot water can be heated at the same time. Due to the use of two heat pump circuits, domestic hot water can be efficiently raised to a higher suitable temperature, and at the same time, the heat source water can produce a large temperature drop to fully utilize its heat. In addition, if there is a time difference between indoor heating and hot water supply, the speed of fan A10 can be adjusted to change the priority of heating and hot water supply. For example, reducing the speed of fan A10 can give priority to hot water supply, and vice versa, it can give priority to heating. Fan B11 can also change the speed according to the indoor exhaust situation until it stops running. When working in cooling mode, the first tube-and-fin heat exchanger 4 can cool the indoor air and the cold water at the same time, and the second tube-and-fin heat exchanger 5 can heat the water and / or release the heat to the indoor exhaust air or the outdoor air, and the hot water can be used as domestic hot water.

[0048] Embodiment 2

[0049] refer to Figure 5This embodiment is a heat pump system using a double inner tube working medium flow path and a single liquid flow path shell-and-tube fin heat exchanger. Compared with the first embodiment, the inner tube flow paths of the shells of the fluid A shell-and-tube fin heat exchanger 4 and the fluid B shell-and-tube fin heat exchanger 5 constitute two working medium flow paths, and the inter-tube flow path constitutes one liquid flow path. The rest is the same as the first embodiment.

[0050] See also Figure 6 and Figure 7 The working medium branches formed by the inner tube 402 of the shell-and-tube fin heat exchanger 4 of fluid A according to the required rules are respectively collected in the upper header 407 of working medium flow path 1 and the lower header 416 of working medium flow path, as well as the lower header 413 of working medium flow path 2 and the upper header 415 of working medium flow path 2, forming working medium flow path 1 and working medium flow path 2, while the liquid branches formed by the outer tube 401 according to the required rules are respectively collected in the upper liquid header 405 and the lower liquid header 414. Except for the difference in the connection method of the working medium flow path and the liquid flow path collecting pipe, the rest is the same as the heat exchanger of embodiment 1.

[0051] The composition and structure of the fluid B shell-and-tube fin heat exchanger 5 are the same or similar to those of the fluid A shell-and-tube fin heat exchanger 4 .

[0052] Compared with the first embodiment, when the temperature of fluid B is high or the heating demand of the room is small, the second embodiment can effectively reduce the operation time of the heat pump and achieve the purpose of energy saving. For example, if fluid B is hot water at about 45°C, the heat pump can be used to heat the indoor air through the tube-and-fin heat exchanger 5 without starting the heat pump; when domestic hot water at 55°C to 65°C is needed at the same time, the heat pump is started to absorb heat from fluid B and release it into fluid A.

[0053] Embodiment 3

[0054] refer to Figure 8 This embodiment is a heat pump system using a double-flow path for working medium and double-flow path for liquid in a shell-and-tube fin heat exchanger. Compared with the first embodiment, in addition to the inter-tube flow paths of the shells of the fluid A shell-and-tube fin heat exchanger 4 and the fluid B shell-and-tube fin heat exchanger 5 forming two working medium flow paths respectively, the inner tube flow paths also form two liquid flow paths respectively; the two liquid flow paths can be used in parallel or in series, and the fluids can be the same fluid in two temperature ranges or two different fluids, which not only increases the flexibility of the liquid side, but also facilitates the use of the working medium flow path and the liquid flow path in reverse. The rest is the same as the first embodiment.

[0055] See also Fig. 9 and Fig.10Compared with the heat exchanger of the first embodiment, the outer tube 401 is also prefabricated into a U-shaped tube, the opening of the U-shaped tube of the inner tube 402 penetrates the U-shaped tube bend of the outer tube 401, and penetrates the outer tube bend A404 at the other end of the outer tube 401, and the outer tube bend B410 can be omitted at this time; the liquid branch formed by the inner tube bend 403 of the inner tube 402 according to the required rules is respectively collected in the upper liquid header 405 and the middle upper header 417, as well as the middle lower header 418 of the second liquid flow path and the lower liquid header 414; the working medium branch formed by the outer tube bend A404 of the outer tube 401 according to the required rules is respectively collected in the upper header 407 of the first working medium flow path and the lower header 416 of the working medium flow path, as well as the lower header 413 of the second working medium flow path and the upper header 415 of the second working medium flow path. Except that the connection method of the liquid branch and the collecting pipe is different after adding a liquid flow path, the rest is the same as the heat exchanger of the first embodiment.

[0056] The composition and structure of the fluid B shell-and-tube fin heat exchanger 5 are the same or similar to those of the fluid A shell-and-tube fin heat exchanger 4 .

[0057] Embodiment 4

[0058] refer to Fig.11 This embodiment is a heat pump system using a working medium single-flow path and a liquid single-flow path shell-and-tube fin heat exchanger. The working medium is R290 or R32. Compared with the first embodiment, except that the inter-tube flow passages of the shells of the fluid A shell-and-tube fin heat exchanger 4 and the fluid B shell-and-tube fin heat exchanger 5 only constitute one working medium flow path, the rest is the same as the first embodiment.

[0059] See also Fig.12 and Fig.13 Compared with the heat exchanger of Example 1, the outer tube 401 of the shell-and-tube fin heat exchanger 4 of fluid A is respectively collected in the upper header 407 of working fluid flow path 1 and the lower header 413 of working fluid flow path 2 through the outer tube bend A404 according to the required rules, and the additional upper header 415 of working fluid flow path 2 and the lower header 416 of working fluid flow path are omitted; similarly, the liquid branches formed by the inner tube 402 through the inner tube bend 403 according to the required rules are respectively collected in the upper liquid header 405 and the lower liquid header 414; except for the connection of the working fluid branches after reducing one working fluid flow path and the difference in the connection method with the collecting pipe, the rest is the same as the heat exchanger of Example 1.

[0060] The composition and structure of the fluid B shell-and-tube fin heat exchanger 5 are the same or similar to those of the fluid A shell-and-tube fin heat exchanger 4 .

[0061] When the shell-and-tube fin heat exchanger 4 for fluid A is placed indoors and the shell-and-tube fin heat exchanger 5 for fluid B is placed outdoors, there are at least two application scenarios: one scenario is that both fluid A and fluid B are domestic hot water. In winter, the heat exchanger 4 can also supply domestic hot water while supplying heating to the indoor room. In summer, the heat exchanger 5 can also supply domestic hot water to the family while supplying cooling to the indoor room, and at the same time improve its energy efficiency ratio of summer cooling; the other scenario is that fluid A is domestic hot water, and fluid B is waste hot water or hot water made from solar energy. When the heat exchanger 4 supplies heating to the indoor room in winter, in addition to supplying domestic hot water at the same time, the heat exchanger 5 can use fluid B and the atmosphere as heat sources, give priority to the use of waste heat or solar energy, and effectively improve its energy efficiency ratio of winter heating.

[0062] The above embodiments are only some of the application schemes of the present technology. In actual application scenarios, new application schemes can be combined according to actual needs. The flow path arrangements of the two tube-and-fin heat exchangers can be the same or different. For example, one of the two tube-and-fin heat exchangers in embodiment 1 can be equipped with the flow path arrangement of the heat exchanger in embodiment 2 or 3 as needed, and embodiment 2 or 3 can also be equipped with similar arrangements as needed.

Claims

1. A heat pump system with a tube-and-fin heat exchanger, characterized in that: The heat pump system comprises a plurality of compressors (1), a four-way valve (2) and a throttling element (3), and two sleeve-and-fin heat exchangers; the sleeves of the sleeve-and-fin heat exchangers are provided with fins on the outside, and the inter-tube side and the inner tube side of the sleeves are working medium or liquid flow paths; the two sleeve-and-fin heat exchangers are respectively provided with one or more working medium flow paths and liquid flow paths, and each working medium flow path or liquid flow path is collected on its inlet and outlet headers; each working medium flow path of each sleeve-and-fin heat exchanger is connected to the compressor ( 1), a four-way valve (2) and a throttling element (3) are connected to form an independent heat pump circuit; the heat pump circuit is filled with working fluid; the number of working fluid flow paths arranged on the two sleeve-fin heat exchangers is the same as the number of corresponding heat pump circuits, and the liquid flow paths are connected to the configured liquid pipelines through their inlet and outlet headers; the heat pump system has two heat pump circuits, which are composed of a first compressor (1A) and a second compressor (1B), a first four-way valve (2A) and a second four-way valve (2B), a first throttling element (3A) and a second throttling element (3B), The invention is composed of a first tube-and-fin heat exchanger (4), a second tube-and-fin heat exchanger (5), a distributor a (6), a distributor b (7), a distributor c (8), a distributor d (9), a fan A (10) and a fan B (11); the fan A (10) and the fan B (11) are installed on the fin side of the tube-and-fin heat exchanger; the working fluid flow path 1 of the first tube-and-fin heat exchanger (4) and the working fluid flow path 2 of the second tube-and-fin heat exchanger (5) pass through the distributor a (6) and the distributor d (9) respectively, and then are connected to the second tube-and-fin heat exchanger (5); A first compressor (1A), a first four-way valve (2A), and a first throttling element (3A) are connected to form a heat pump circuit A; a working fluid flow path 2 of a first shell-and-tube fin heat exchanger (4) and a working fluid flow path 1 of a second shell-and-tube fin heat exchanger (5) are respectively connected to a second compressor (1B), a second four-way valve (2B), and a second throttling element (3B) to form a heat pump circuit B after passing through a distributor b (7) and a distributor c (8); the shell-and-tube fin heat exchanger is configured with one or two liquid flow paths, which are the same or different.

2. A heat pump system with a tube-and-fin heat exchanger according to claim 1, characterized in that: The first tube-and-fin heat exchanger (4) is provided with two working fluid flow paths and one liquid flow path, and is composed of an outer tube (401), an inner tube (402), an inner tube bend (403), an outer tube bend A (404), an upper liquid header (405), a lower liquid header (414), fins (406), an upper working fluid flow path header (407), a lower working fluid flow path header (416), a right frame (408), an upper frame (409), an outer tube bend B (410), a left frame (411), a lower frame (412), a second lower working fluid flow path header (413), and a second upper working fluid flow path header (415); the outer tube (401) is arranged into a tube array according to a certain rule, and a plurality of fins (406) are connected in series on the outside; the tube array of the outer tube (401) is supported between the left frame (411) and the right frame (408) and is tightly connected together; the inner tube (402) A prefabricated U-shaped tube is inserted into the outer tube (401) to form a sleeve; the outer tube bend B (410) is pre-inserted into the U-shaped tube bend of the inner tube (402); the inner tube (402) at the opening of the U-shaped tube passes through the outer tube bend A (404); the outer tube bend A (404) and the bend B (410) connect the outer tube (401) into a plurality of branches according to the required rules and respectively gather them in the working fluid flow path upper header (407) and the working fluid flow path A lower header (416), a second upper header (415) for the working fluid flow path, and a second lower header (413) for the working fluid flow path, and an inner tube bend (403) connect the inner tube (402) into a plurality of branches according to the required rules and collect them in the liquid upper header (405) and the liquid lower header (414); an upper frame (409) and a lower frame (412) are respectively connected to the right frame (408) and the left frame (411) to form an installation frame.

3. A heat pump system with a tube-and-fin heat exchanger according to claim 1, characterized in that: The fin-in-tube heat exchanger with a fin-in-tube heat exchanger is a tube-in-tube fin type, a tube-rolled fin type or a tube-wound fin type; the fins on the fin-in-tube can be omitted, the outer tube is a single tube arranged in a regular pattern and then connected to form a flow path with a bend, or processed into a U-shaped tube or an S-shaped tube and then connected to form a flow path with a bend; the inner tube built into the fin-in-tube is a single tube or multiple tubes, and the connection method at both ends is suitable for the fin-in-tube.

4. A heat pump system with a tube-and-fin heat exchanger according to claim 1, characterized in that: The flow path arrangements of the two tube-and-fin heat exchangers are the same or different; the number of working fluid flow paths and the number of liquid flow paths are one, or two or more.

5. The heat pump system with a tube-and-fin heat exchanger according to claim 1, characterized in that: The four-way valve can be omitted; the throttling element is a throttling tube, a throttling hole, a throttling valve or an expansion valve; the compressor is an independent compressor or a compressor cylinder with independent suction and exhaust.

6. A heat pump system with a tube-and-fin heat exchanger according to claim 1, characterized in that: The inner tube and inter-tube flow passage of the shell-and-tube fin heat exchanger of the heat pump system carry liquid and working fluid respectively, or carry working fluid and liquid respectively; the working fluid is R134a, R410A, R32, R290 or R600a, the fluid is water, antifreeze or synthetic fluid, the working fluids used in different heat pump circuits are the same or different, and the fluids used in different liquid flow passages are the same or different.

7. A heat pump system with a tube-and-fin heat exchanger according to claim 2, characterized in that: The outer tube (401) of the first tube-in-tube fin heat exchanger (4) is prefabricated into a U-shaped tube, so that the outer tube bend B (410) can be omitted. The U-shaped tube opening of the inner tube (402) penetrates the U-shaped tube bend of the outer tube (401), and the other end of the outer tube (401) penetrates the outer tube bend A (404).

8. The heat pump system with a tube-and-fin heat exchanger according to claim 1, characterized in that: The distributor is formed by connecting four two-way valves or single-phase valves, or two three-way valves according to the principle of consistent flow direction in the working fluid flow path.

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