A hot and cold water circulation system utilizing waste heat from air conditioning

Abstract

A hot and cold water circulation system utilizing the waste heat of an air conditioner comprises: a water storage tank provided with a cold water outlet and a return inlet; a heat-insulating shell sleeved on an air conditioner outer unit provided with an air collecting port for collecting and discharging the hot air generated by the air conditioner outer unit; a heat exchanger provided with a water inlet, a water outlet, and a first flow channel for water flow connected to the water storage tank, and the water in the water storage tank flows back to the water storage tank through the cold water outlet, the water inlet, the first flow channel, the water outlet, and the return inlet; the heat exchanger is also provided with an air inlet, an air outlet, and a second flow channel connected to the heat-insulating shell, and the hot air in the heat-insulating shell is discharged outward through the air collecting port, the air inlet, the second flow channel, and the air outlet; the fluids flowing in the first flow channel and the second flow channel respectively exchange heat during the flow process. The present invention has a simple structure, low cost, small space occupation, and easy installation. It is suitable for household air conditioners and can fully convert the waste heat of air conditioners into energy required for life, preventing the waste heat of air conditioners from harming the environment while saving energy.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioner waste heat recovery, and more specifically, to a hot and cold water circulation system utilizing air conditioner waste heat. Background Art

[0002] Air conditioning waste heat is an important factor leading to the heat island effect. In order to reduce the impact of air conditioning waste heat on the heat island effect, the treatment of air conditioning waste heat is particularly important. In addition, air conditioning waste heat is often dissipated to the external environment after it is generated and cannot be fully utilized, so the reuse of air conditioning waste heat is also crucial. There are many air conditioning waste heat utilization technologies in the existing technology, especially the waste heat utilization technology of central air conditioning in large buildings. Combined with energy storage technology, air conditioning waste heat can be used to provide users with free heating, domestic hot water and other conveniences. At present, many mature waste heat utilization technologies have been applied.

[0003] However, for household air conditioners, the existing technology has factors such as high cost, complex structure, and large installation space required. It is impossible to achieve air conditioning waste heat treatment and utilization based on common and low-cost equipment and simple structure, and it is difficult to apply it to household air conditioners. Therefore, a large amount of air conditioning waste heat is still directly discharged into the external environment, which not only aggravates the heat island effect, but also the waste heat cannot be recycled and utilized, wasting a lot of heat. Summary of the invention

[0004] The present invention aims to overcome at least one of the shortcomings of the above-mentioned prior art and provide a hot and cold water circulation system that utilizes the waste heat of air conditioning. The waste heat of air conditioning is reused by using common and inexpensive equipment. The equipment occupies a small space and has a low installation cost. It can be applied to household air conditioners and has a wider range of applications.

[0005] The technical solution adopted by the present invention is a hot and cold water circulation system that utilizes the waste heat of an air conditioner, comprising: a water storage tank provided with a cold water outlet and a reflux inlet; a heat-insulating shell mounted on the outdoor unit of the air conditioner, the heat-insulating shell provided with an air collecting port, the air collecting port being used to collect and discharge the hot air generated by the outdoor unit of the air conditioner; a heat exchanger, the heat exchanger provided with a water inlet, a water outlet and a first flow channel for water flow connected to the water storage tank, the water in the water storage tank flows back to the water storage tank via the cold water outlet, the water inlet, the first flow channel, the water outlet and the reflux inlet in sequence; the heat exchanger is also provided with an air inlet, an air outlet and a second flow channel connected to the heat-insulating shell, the hot air in the heat-insulating shell is discharged outward via the air collecting port, the air inlet, the second flow channel and the air outlet in sequence; and the fluids flowing in the first flow channel and the second flow channel respectively exchange heat with each other during the flow process.

[0006] The cold water in the water storage device reaches the water outlet in sequence through the cold water outlet of the water storage device, the water inlet of the heat exchanger, and the first flow channel. The cold water flowing out of the cold water outlet of the water storage device exchanges heat with the gas flowing in the second flow channel of the heat exchanger during the flow in the first flow channel. When reaching the water outlet, it has become hot water with a temperature higher than the original water temperature. The hot water then enters the water storage device through the water outlet of the heat exchanger and the reflux inlet of the water storage device for storage and use. It can also be used for recirculation and heat exchange to increase the temperature. The heat-insulating shell mounted on the air conditioner outdoor unit first collects the waste heat of the air conditioner outdoor unit. The hot air generated by the air conditioner outdoor unit flows out through the air collecting port on the heat-insulating shell. The present invention connects the air collecting port and the air inlet of the heat exchanger, thereby guiding the hot air to enter the heat exchanger. After the hot air enters the air inlet of the heat exchanger, it reaches the air outlet through the second flow channel in the heat exchanger. During the flow in the second flow channel, the hot air exchanges heat with the water in the first flow channel, thereby increasing the temperature of the cold water and cooling the hot air. That is, after the cold water in the water storage tank and the hot air generated by the air conditioner outdoor unit enter the heat exchanger, the first flow channel and the second flow channel can realize the heat exchange between water and gas, thereby achieving the effect of lowering the temperature of the hot air and raising the water temperature, that is, avoiding the hot air from being directly discharged to the outside environment to affect the environment, and making full use of the heat energy of the air conditioner waste heat to avoid energy waste. Preferably, the air outlet is connected to the outside world, and the cooled air is directly discharged to the outside environment.

[0007] That is, the present invention can realize the reuse of air conditioning waste heat through the basic structure consisting of a water storage tank, a heat exchanger, and an insulated shell with an air collecting port. Compared with the central air conditioner and automobile engine air conditioning waste heat reuse system in the prior art, the structure is simpler, and the equipment required can all use common and low-priced equipment on the market. It is simple to install, has low installation cost, and occupies a small space, which can significantly reduce costs, so that it can be widely used in different families, increase the utilization rate of air conditioning waste heat reuse systems, thereby improving the air conditioning waste heat reuse rate in the entire region and reducing the impact of air conditioning waste heat on the environment. At the same time, the air conditioning waste heat is used to heat the water to provide warm water for users, making full use of the air conditioning waste heat while saving the original water heating energy.

[0008] Preferably, the heat exchanger is a plate heat exchanger, which is installed on the side of the heat-insulating shell; compared with other heat exchangers in the prior art, the plate heat exchanger occupies less space and can be applied to different types of air-conditioning outdoor units, especially suitable for household air-conditioning outdoor units, which do not require too much space for installation; it is light in weight, which reduces the difficulty of installation, thereby reducing the installation cost; and has a high heat transfer coefficient. Since the flow channel on the plate heat exchanger is small and the cross-sectional changes are complex, the flow direction and flow rate of the fluid are constantly changing, which increases the disturbance of the fluid, thereby achieving flocculation at a very small flow rate, thereby achieving sufficient heat transfer, improving the heat transfer efficiency between water and hot air, and reducing the loss of hot air heat energy. In addition, the low price of the plate heat exchanger can promote the application of the system in different households, and the plate heat exchanger can flexibly combine the number of heat exchange plates, thereby further improving the heat exchange efficiency in combination with specific needs.

[0009] Preferably, the plate heat exchanger includes a plurality of heat exchange plates and an odd number of gaps for fluid flow formed by the plurality of heat exchange plates, the gaps being gaps formed between the heat exchange plates or between the heat exchange plates and other adjacent plates of the prior art, water and gas flow in adjacent gaps, the first flow channel includes a parallel flow channel formed by gaps for water flow, the second flow channel includes a parallel flow channel formed by gaps for gas flow, and the gaps close to the air inlet and away from the air inlet belong to the second flow channel. The plate heat exchanger is the plate heat exchanger in the prior art, but in the present invention, it is preferably configured to have a plurality of heat exchange plates that produce an odd number of gaps for fluid flow, and the gaps close to the air inlet and away from the air inlet belong to part of the second flow channel, so that the gaps at both ends of the entire plate heat exchanger flow as hot air, thereby achieving heat preservation of the gap fluid inside the heat exchanger and reducing the heat energy loss of the water in the first flow channel after heating.

[0010] Preferably, a high-temperature pneumatic angle seat valve is provided between the cold water outlet of the water storage tank and the water inlet of the heat exchanger, and the gas collecting port is connected to the gas collecting pipe, and the gas collecting port is connected to the pneumatic inlet of the high-temperature pneumatic angle seat valve through the gas collecting pipe, and a first branch pipe is provided on the side of the gas collecting pipe close to the high-temperature pneumatic angle seat valve, and the branch pipe connects the gas collecting pipe and the air inlet of the heat exchanger.

[0011] The cold water outlet of the water storage device is connected to the water inlet of the heat exchanger by a pipe, wherein a high-temperature pneumatic angle seat valve is provided on the pipe, and the high-temperature pneumatic angle seat valve is a common pneumatic angle seat valve in the prior art, and the high-temperature pneumatic angle seat valve is provided with a pneumatic inlet, and the pneumatic inlet is connected to the air collecting port through the air collecting pipe, and the hot air generated by the air conditioner outdoor unit flows into the air collecting pipe through the air collecting port; a part of the hot air flowing into the air collecting pipe from the air collecting port flows toward the high-temperature pneumatic angle seat valve, driving the valve to open, at this time, the cold water outlet is connected to the water inlet, and the cold water flows to the water inlet of the heat exchanger through the pipe, and the cold water enters the heat exchanger; at the same time, another part of the hot air flowing into the air collecting pipe from the air collecting port flows toward the air inlet of the heat exchanger through the first branch pipe connected to the air collecting pipe, and the hot air enters the heat exchanger. When the air conditioner is in the off state or there is no hot air in the air collecting pipe, no hot air flows into the pneumatic inlet, the high-temperature pneumatic angle seat valve is closed, the cold water outlet and the water inlet are in a disconnected state, and the cold water cannot enter the heat exchanger.

[0012] That is, the present invention realizes that when the hot air flows into the gas collecting pipe through the gas collecting port after the air conditioner is turned on, the entire heat exchange system is started, and cold water is prevented from continuously entering the heat exchanger when there is no hot air heat transfer, and the unheated cold water is prevented from flowing back to the water storage tank to reduce the temperature of the warm water in the original water storage tank. The high-temperature pneumatic angle seat valve is used to realize the linkage of hot air and cold water entering the heat exchanger. In addition to avoiding a single fluid from entering without heat exchange, it can also ensure that hot air and cold water tend to enter the heat exchanger at the same time, thereby improving the transmission of thermal energy.

[0013] Preferably, the diameter of the gas collecting pipe gradually decreases between the gas collecting port and the pneumatic inlet, the side of the first branch pipe connected to the gas collecting pipe is perpendicular to the gas collecting pipe, and the diameter of the first branch pipe gradually increases between the gas collecting pipe and the air inlet. The pneumatic inlet of the high-temperature pneumatic angle seat valve often requires a higher air pressure to drive the valve to open. The present invention accelerates the flow rate of hot air by gradually reducing the diameter of the gas collecting pipe between the gas collecting port and the pneumatic inlet, thereby facilitating driving the high-temperature pneumatic angle seat valve to open. The first branch pipe disposed on the side of the gas collecting pipe close to the high-temperature pneumatic angle seat valve avoids most of the hot air from rushing to the first branch pipe first, and makes most of the hot air rush to the side of the high-temperature pneumatic angle seat valve, which facilitates driving the valve to open. The first branch pipe is perpendicular to the air collecting pipe, which can prevent hot air from flowing into the first branch pipe quickly. The diameter of the first branch pipe close to the air collecting pipe gradually decreases in the direction from the air collecting pipe to the air inlet, and forms a fixed diameter before entering the air inlet, thereby reducing the flow rate of hot air entering the air inlet of the heat exchanger and the heat exchanger, slowing its flow rate in the heat exchanger, and increasing the heat exchange time per unit volume of hot air, so that it can fully exchange heat with the water in the first flow channel.

[0014] Preferably, the air outlet is connected to an air outlet pipe, and the air outlet pipe is connected to the external environment; a second branch pipe is provided on the side of the air outlet pipe away from the air outlet, and the second branch pipe is connected to the air outlet pipe and the air collecting pipe, and a switching valve is provided at the connection between the second branch pipe and the air outlet pipe, and the switching valve is used to switch the hot air in the air outlet pipe to be discharged to the external environment or to the air collecting pipe; a temperature sensor is provided between the switching valve and the air outlet, and the temperature sensor is connected to the switching valve. The angle between the second branch pipe and the air collecting pipe is less than 60°. When the temperature of the hot air generated by the air conditioner outdoor unit is high, the hot air may still maintain a high temperature after a single heat exchange; or when the heat exchange efficiency is low, the heat cannot be fully exchanged, and the heat transfer of the hot air is small; at this time, by setting a threshold on the temperature sensor and detecting whether the air discharged from the air outlet is below the threshold, when the air after heat exchange is below the threshold, the switching valve switches to the air outlet pipe to be connected to the outside world, and the air after heat transfer is discharged to the outside world through the air outlet pipe. When the air after heat exchange is still above the threshold, the switching valve switches to connect the air outlet pipe with the air collecting pipe. At this time, the hot air after heat exchange enters the heat exchanger again through the second branch pipe, the air collecting pipe, and the first branch pipe, so as to be cooled again, thereby minimizing the impact of hot air on the environment.

[0015] Preferably, the water inlet and the air inlet are at the same height, the water outlet and the air outlet are at the same height, and the water inlet and the air inlet are arranged below the water outlet and the air outlet. In combination with the plate heat exchanger in the prior art, the water inlet, the air inlet, the water outlet and the air outlet are all arranged on one side of the plate heat exchanger. When the water inlet and the air inlet on the plate heat exchanger are at the same height, the water outlet and the air outlet are at the same height, and the water inlet and the air inlet are arranged below the water outlet and the air outlet, the water and the hot air entering the heat exchanger flow from bottom to top in the gap between the heat exchange plates, that is, the water and the hot air exchange heat in the same direction. This heat exchange method is helpful for the installation of the plate heat exchanger. The air inlet and the water inlet maintain the simultaneous entry of the corresponding fluid under the action of the high-temperature pneumatic angle seat valve. The air inlet and the water inlet are at the same height and are arranged below the water outlet and the air outlet, thereby avoiding the excessive length and bending of the gas collecting pipe and the first branch pipe, which is convenient for the installation of the pipe and the plate heat exchanger and can avoid the problem of fluid flow obstruction caused by bending.

[0016] Preferably, the water inlet and the air outlet are at the same height, the water outlet and the air inlet are at the same height, and the water inlet and the air outlet are arranged below the water outlet and the air inlet. At this time, the water entering the heat exchanger flows from bottom to top in the gaps between the heat exchange plates, and the hot air entering the heat exchanger flows from top to bottom in the gaps between the heat exchange plates, thereby realizing reverse flow heat exchange and improving heat exchange efficiency. Preferably, the water inlet, the water outlet, the air inlet, and the air outlet can also be arranged in other positions as long as they can also exchange heat in the plate heat exchanger.

[0017] Preferably, the air outlet or the air outlet duct is oriented parallel to the wall on which the air conditioner outdoor unit is installed, so as to prevent the heat exchanger disposed on the first floor from directly discharging the heat-exchanged air to pedestrians.

[0018] Preferably, the air collecting port is arranged on the side of the heat insulating shell, and the surface of the heat insulating shell bulges outward to form a convex mouth-shaped air collecting port. The diameter of the air collecting port is reduced during the process of the heat insulating shell surface bulging outward to form a convex mouth-shaped air collecting port, which helps the hot air in the heat insulating shell to be discharged through the air collecting port.

[0019] Preferably, the cold water outlet is lower than the reflux inlet and / or the water reservoir is connected to a water circulation pump. When the water reservoir is not provided with a circulation pump, the water circulation can be driven by the pressure difference by arranging the cold water outlet below the reflux inlet. In addition, the water reservoir can also be connected to a water pump at the same time or only, so as to drive the water in the water reservoir to flow out and flow back by the water pump.

[0020] Compared with the prior art, the beneficial effects of the present invention are: utilizing a simple structure to realize the reuse of air-conditioning waste heat, utilizing air-conditioning waste heat to realize hot and cold water circulation, thereby fully converting air-conditioning waste heat into energy required for life, preventing air-conditioning waste heat from harming the environment while saving energy. The reuse of air-conditioning waste heat can be realized by utilizing a water storage tank, a heat exchanger, and an insulating shell with an air collecting port. Compared with the medium and large-scale air-conditioning waste heat utilization system in the prior art, it has lower cost, occupies less space, is easier to install, and can be applied to more scenarios, especially for household air conditioners. The characteristics of low cost and easy installation will help more home users adopt the system, thereby improving the utilization rate of the hot and cold water circulation system based on air-conditioning waste heat, reducing the aggravation of the heat island effect caused by household air-conditioning waste heat in the entire region, and saving a lot of energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a partial structural schematic diagram of an embodiment (I).

[0022] Figure 2 This is a partial structural diagram of an embodiment (II).

[0023] Figure 3 It is a schematic diagram of the structure of an embodiment.

[0024] Figure 4 It is a partial enlarged view of the schematic diagram of the structure of the embodiment.

[0025] Figure 5 Schematic diagram of fluid flow in the embodiment (I).

[0026] Figure 6 Schematic diagram of fluid flow in the embodiment (II).

[0027] Figure 7 Schematic diagram of fluid flow in the embodiment (III).

[0028] Description of the drawings: water tank 1, cold water outlet 11, reflux inlet 12, heat-insulating shell 2, air collecting port 21, air collecting pipe 211, first branch pipe 212, heat exchanger 3, water inlet 31, water outlet 32, air inlet 33, air outlet 34, air outlet pipe 341, second branch pipe 342, switching valve 343, high-temperature pneumatic angle seat valve 4, pneumatic inlet 41. DETAILED DESCRIPTION

[0029] The drawings of the present invention are only for illustrative purposes and should not be construed as limiting the present invention. In order to better illustrate the following embodiments, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; it is understandable to those skilled in the art that some well-known structures and their descriptions in the drawings may be omitted.

[0030] Example

[0031] like Figure 1 , 2 As shown in FIG. 3 , a hot and cold water circulation system utilizing waste heat of an air conditioner comprises: a water storage tank 1 having a cold water outlet 11 and a return inlet 12; a heat-insulating housing 2 mounted on an air conditioner outdoor unit, the heat-insulating housing having an air collecting port 21, the air collecting port 21 being used to collect and discharge hot air generated by the air conditioner outdoor unit; a heat exchanger 3 having a water inlet 31 and a water outlet 32 ​​communicating with the water storage tank 1 and a first flow channel for water flow, the first flow channel being as shown in FIG. Figure 6 As shown; the water in the water storage tank 1 flows back to the water storage tank 1 through the cold water outlet 11, the water inlet 31, the first flow channel, the water outlet 32, and the reflux inlet 12 in sequence; the heat exchanger 3 is also provided with an air inlet 33, an air outlet 34 and a second flow channel for the flow of heated air connected to the heat insulation shell 2, and the second flow channel is as shown Figure 6 As shown, the hot air in the heat-insulating housing 2 is discharged outward through the air collecting port 21, the air inlet 33, the second flow channel, and the air outlet 34 in sequence; and the fluids flowing in the first flow channel and the second flow channel exchange heat with each other during the flow process. Figure 3 and Figure 1 , 2 The water inlet, water outlet, air inlet and air outlet are not at the same height and are only for the convenience of showing the installation of water pipes and the connection relationship of each port.

[0032] like Figure 3 , 5 As shown, the heat exchanger 3 is a plate heat exchanger, and the plate heat exchanger 3 is installed on the side of the heat-insulating housing 2; the plate heat exchanger 3 includes a plurality of heat exchange plates and an odd number of gaps, and the gaps shown are gaps between the heat exchange plates or between the heat exchange plates and other plates, and water and gas flow in adjacent gaps, respectively, as shown in FIG. Figure 5 As shown. According to the prior art, the flow actually occurs on the surface of the heat exchange plate on one of the two sides of the gap, such as Figure 6 As shown, the corresponding heat exchange plates are provided with rubber ring seals to prevent fluid leakage. In addition, Figure 5 For the sake of convenience, the rubber ring and the through hole of the heat exchange plate are not shown; Figure 6 It is only used to illustrate the flow direction. As for the specific heat exchange plate type, other plates can be combined using existing technology.

[0033] like Figure 5 , 6 As shown, the water inlet 31, the through hole on the heat exchange plate corresponding to the water inlet 31, a plurality of gaps for water flow or heat exchange plate surface flow channels, and the through hole on the heat exchange plate opposite to the water outlet 32 ​​together form a first parallel flow channel. Similarly, the air inlet 33, the through hole on the heat exchange plate corresponding to the air inlet 33, a plurality of gaps for hot air flow or heat exchange plate surface flow channels, and the through hole on the heat exchange plate 35 opposite to the air outlet 34 together form a second parallel flow channel. In this embodiment, a plurality of heat exchange plates are provided to form an odd number of gaps for fluid flow, and the gaps close to the air inlet and away from the air inlet are both part of the second flow channel, that is, hot air flows through them, so that the gaps at both ends of the entire plate heat exchanger are circulated with hot air, so as to achieve the insulation of the gap fluid inside the heat exchanger and reduce the heat energy loss of the water in the first flow channel after heating.

[0034] like Figure 3 , 4 As shown, a high-temperature pneumatic angle seat valve 4 is provided between the cold water outlet 11 of the water storage tank and the water inlet 31 of the heat exchanger 3, and the gas collecting port 21 is connected to the gas collecting pipe 211, and the gas collecting port 21 is connected to the pneumatic inlet 41 of the high-temperature pneumatic angle seat valve 4 through the gas collecting pipe 211, and a first branch pipe 212 is provided on the side of the gas collecting pipe 211 close to the high-temperature pneumatic angle seat valve 4, and the first branch pipe 212 connects the gas collecting pipe 211 and the gas inlet 33 of the heat exchanger.

[0035] The diameter of the gas collecting pipe 211 gradually decreases between the gas collecting port 21 and the pneumatic inlet 41, and a passage of fixed diameter is formed on the side close to the pneumatic inlet. The first branch pipe 212 is perpendicular to the gas collecting pipe 211 on the side connected to the gas collecting pipe 211, and the diameter of the first branch pipe 212 gradually increases on one side of the gas collecting pipe 211 in the direction from the gas collecting pipe 211 to the air inlet 33.

[0036] like Figure 3 , 4As shown, the air outlet 34 is connected to an air outlet pipe 341, and the air outlet pipe 341 is connected to the external environment; a second branch pipe 342 is provided on the side of the air outlet pipe 341 away from the air outlet 34, and the second branch pipe 342 connects the air outlet pipe 341 and the gas collecting pipe 211, and a switching valve 343 is provided at the connection between the second branch pipe 342 and the air outlet pipe 341, and the switching valve 343 is used to switch the hot air in the air outlet pipe 341 to be discharged to the external environment or to the gas collecting pipe 211; a temperature sensor (not shown in the figure) is provided between the switching valve 343 and the air outlet 34, and the temperature sensor is connected to the switching valve 343. The angle α between the second branch pipe 342 and the gas collecting pipe 211 is less than 60°.

[0037] like Figure 6 As shown, the water inlet 31 and the air inlet 33 are at the same height, the water outlet 32 ​​and the air outlet 34 are at the same height, and the water inlet 31 and the air inlet 33 are arranged below the water outlet 32 ​​and the air outlet 34. In combination with the plate heat exchanger in the prior art, the water inlet 31, the air inlet 33, the water outlet 32 ​​and the air outlet 34 are all arranged on one side of the plate heat exchanger 3. When the water inlet 31 and the air inlet 33 on the plate heat exchanger 3 are at the same height, the water outlet 32 ​​and the air outlet 34 are at the same height, and the water inlet 31 and the air inlet 33 are arranged below the water outlet 32 ​​and the air outlet 34, the water and the hot air entering the heat exchanger 3 flow from bottom to top in the gap between the heat exchange plates, that is, the water and the hot air exchange heat in the same direction. This heat exchange method is helpful for the installation of the plate heat exchanger and avoids the excessive length and bending of the gas collecting pipe 211 and the first branch pipe 212, which is convenient for the installation of the pipe and the plate heat exchanger 3 and avoids the problem of fluid flow obstruction caused by bending.

[0038] In addition, you can also use Figure 7 In the arrangement shown, the water inlet 31 and the air outlet 34 are at the same height, the water outlet 32 ​​and the air inlet 33 are at the same height, and the water inlet 31 and the air outlet 34 are arranged below the water outlet 32 ​​and the air inlet 33. At this time, the water entering the heat exchanger 3 flows from bottom to top in the gaps between the heat exchange plates, and the hot air entering the heat exchanger flows from top to bottom in the gaps between the heat exchange plates, thereby realizing reverse flow heat exchange and improving heat exchange efficiency.

[0039] In this embodiment, the gas collecting port 21 is arranged on the side of the heat insulating shell 2, and the surface of the heat insulating shell 2 protrudes outward to form a protruding mouth-shaped gas collecting port 21. Figure 1 , 2 As shown, the cold water outlet 11 of the water storage tank is lower than the reflux inlet 12. In addition, although not specifically described in this document, the water storage tank of the present invention can use the existing technology to separate the cold and hot water in the same container, but the upper reflux hot water can squeeze the lower cold water out.

[0040] Implementation principle: the cold water at the bottom of the water storage tank 1 flows to the water inlet 31 of the heat exchanger 3 through the cold water outlet 11 and the pipeline, and a high-temperature pneumatic angle seat valve 4 is provided on the pipeline between the cold water outlet 11 and the water inlet 31, and the high-temperature pneumatic angle seat valve 4 is provided with a pneumatic inlet 41. When no air flows to the pneumatic inlet 41, the valve is closed, and the cold water outlet 11 and the water inlet 31 are not connected; the air collecting port 21 of the heat-insulating shell 2 discharges the hot air generated by the air-conditioning outdoor unit in the heat-insulating shell 2 into the air collecting pipe 211, and the air collecting pipe 211 is connected to the pneumatic inlet 41 of the high-temperature pneumatic angle seat valve 4, and the air collecting pipe 211 is also provided with a first branch pipe 212. Part of the hot air entering the air collecting pipe 211 flows to the pneumatic inlet 41, driving the high-temperature pneumatic angle seat valve 4 to open, and the cold water outlet 11 is connected to the water inlet 31, and cold water flows to the water inlet 31 of the heat exchanger 3. At the same time, another part of the hot air in the air collecting pipe 211 enters the first branch pipe 212 and flows toward the air inlet 33 of the heat exchanger 3. At this time, both hot air and cold water enter the heat exchanger 3, wherein the cold water enters the first flow channel and the hot air enters the second flow channel. The first flow channel includes multiple gaps for water flow, and the second flow channel includes multiple gaps for hot air flow. The hot air and cold water flow in adjacent gaps in the plate heat exchanger 3 and converge and flow toward the air outlet 34 and the water outlet 32 ​​respectively. The cold water and the hot air exchange heat in the plate heat exchanger 3. After receiving the heat, the cold water flows back to the water storage tank 1 through the reflux inlet 12. After the hot air cools down, it is discharged through the air outlet pipe 341 connected to the air outlet 34. The temperature sensor compares the temperature of the hot air after heat transfer with the threshold, so that the switching valve 343 is switched to the corresponding position. After heat transfer, the hot air is directly discharged to the external environment or enters the heat exchanger 3 again through the second branch pipe 342 for heat exchange until it is lower than the threshold and then discharged to the external environment.

[0041] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the technical solution of the present invention, and are not intended to limit the specific implementation methods of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the claims of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A hot and cold water circulation system utilizing waste heat from air conditioning, characterized in that: include: A water storage tank having a cold water outlet and a return water inlet; A heat-insulating shell sleeved on the air conditioner outdoor unit, the heat-insulating shell being provided with an air collecting port, the air collecting port being used to collect and discharge hot air generated by the air conditioner outdoor unit; A heat exchanger, wherein the heat exchanger is provided with a water inlet and a water outlet connected to the water reservoir and a first flow channel for water supply flow, and the water in the water reservoir flows back to the water reservoir through the cold water outlet, the water inlet, the first flow channel, the water outlet, and the reflux inlet in sequence; the heat exchanger is also provided with an air inlet, an air outlet, and a second flow channel connected to the heat-insulating shell, and the hot air in the heat-insulating shell is discharged outward through the air collecting port, the air inlet, the second flow channel, and the air outlet in sequence; and the fluids flowing in the first flow channel and the second flow channel respectively exchange heat with each other during the flow process; The heat exchanger is a plate heat exchanger, and the plate heat exchanger is installed on the side of the heat insulation shell; A high-temperature pneumatic angle seat valve is provided between the cold water outlet of the water storage tank and the water inlet of the heat exchanger, the gas collecting port is connected to a gas collecting pipeline, the gas collecting port is connected to the pneumatic inlet of the high-temperature pneumatic angle seat valve through the gas collecting pipeline, and a first branch pipeline is provided on one side of the gas collecting pipeline close to the high-temperature pneumatic angle seat valve, the branch pipeline connects the gas collecting pipeline and the gas inlet of the heat exchanger; The plate heat exchanger includes a plurality of heat exchange plates and an odd number of gaps for fluid flow formed by the plurality of heat exchange plates. Water and gas flow in adjacent gaps. The first flow channel includes parallel flow channels formed by the gaps for water flow, the second flow channel includes parallel flow channels formed by the gaps for gas flow, and the gaps close to the air inlet and away from the air inlet both belong to the second flow channel.

2. A hot and cold water circulation system utilizing waste heat from air conditioning according to claim 1, characterized in that: The diameter of the gas collecting pipe gradually decreases between the gas collecting port and the pneumatic inlet, the side of the first branch pipe connected to the gas collecting pipe is perpendicular to the gas collecting pipe, and the diameter of the side of the first branch pipe close to the gas collecting pipe gradually increases in the direction from the gas collecting pipe to the air inlet.

3. A hot and cold water circulation system using waste heat from air conditioning according to claim 1, characterized in that: The air outlet is connected to an air outlet pipe, and the air outlet pipe is connected to the external environment; a second branch pipe is provided on the side of the air outlet pipe away from the air outlet, and the second branch pipe connects the air outlet pipe and the air collecting pipe, and a switching valve is provided at the connection between the second branch pipe and the air outlet pipe, and the switching valve is used to switch the hot air in the air outlet pipe to be discharged to the external environment or to the air collecting pipe; a temperature sensor is provided between the switching valve and the air outlet, and the temperature sensor is connected to the switching valve.

4. A hot and cold water circulation system using waste heat from air conditioning according to claim 1, characterized in that: The water inlet and the air inlet are at the same height, the water outlet and the air outlet are at the same height, and the water inlet and the air inlet are arranged below the water outlet and the air outlet.

5. A hot and cold water circulation system utilizing waste heat from air conditioning according to claim 1, characterized in that: The water inlet and the air outlet are at the same height, the water outlet and the air inlet are at the same height, and the water inlet and the air outlet are arranged below the water outlet and the air inlet.

6. A hot and cold water circulation system using waste heat from air conditioning according to any one of claims 1 to 5, characterized in that: The gas collecting port is arranged on the side of the heat-insulating shell, and the surface of the heat-insulating shell protrudes outward to form a protruding mouth-shaped gas collecting port.

7. A hot and cold water circulation system using waste heat from air conditioning according to any one of claims 1 to 5, characterized in that: The cold water outlet is lower than the reflux inlet and / or the water reservoir is connected to a water circulation pump.

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