Combined heat supply system

Abstract

The utility model belongs to the technical field of heat supply, and particularly discloses a combined heat supply system. The combined heat supply system comprises heat source equipment, a floor heating device and a heat pump device, a hot water outlet of the heat source equipment and a water return port of the floor heating device are connected with a water supply pipe, and a water return pipe is connected between the water return port of the heat source equipment and a water outlet of the floor heating device; the heat pump device comprises a water tank, a compressor, a main heat exchanger, a throttling device and a heat exchanger. The compressor, the main heat exchanger, the throttling device and a first heat exchange channel are sequentially connected end to end to form a refrigerant circulation pipeline. The water inlet end and the water outlet end of the second heat exchange channel are both connected into a water return pipe, the water return pipe is sequentially provided with a first intersection point and a second intersection point in the water flowing direction, the water inlet end of the second heat exchange channel communicates with the first intersection point, and the water outlet end of the second heat exchange channel communicates with the second intersection point. Heating in winter and refrigerating in summer can be achieved, and the use experience of the combined heating system is provided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of heat supply, especially relates to a combined heat supply system. BACKGROUND

[0002] The heat source equipment is the common equipment that water is heated and supplied to the water end through electric energy, heat generated by gas combustion, solar energy or other energy, and it is generally divided into electric water heater, gas water heater, solar water heater or heat pump water heater according to heating mode.

[0003] The prior art provides a combined heat supply system, which comprises a heat pump device, a floor heating device and a heat exchange assembly, the heat pump device comprises a water tank and a heat pump assembly, the heat pump assembly comprises a compressor, a condenser and a throttling device connected in sequence from head to tail, the heat exchange assembly comprises a water inlet pipe, a plate heat exchanger and a water outlet pipe connected in sequence, the water inlet pipe is connected to the water supply pipe of the floor heating device, and the water outlet pipe is connected to the return water pipe of the heating system, and another heat exchange channel of the plate heat exchanger is connected in series between the inlet of the compressor and the throttling device.

[0004] The combined heat supply system provided by the prior art can make part of the heating water flow to the plate heat exchanger to heat the refrigerant flowing through the plate heat exchanger and release heat, so that part of the heat of the heating water can be used for heating the refrigerant in the heat pump device when there is a heating demand in winter. UTILITY MODEL CONTENTS

[0005] The utility model solves the technical problem that when the heat pump device and the floor heating device of the existing combined heat supply system run simultaneously, the heating water in the floor heating device has flow and pressure fluctuations.

[0006] The above technical problem is solved by the following technical scheme:

[0007] A combined heat supply system, comprising a heat source equipment, a floor heating device and a heat pump device, a water supply pipe is connected between the hot water outlet of the heat source equipment and the return water port of the floor heating device, and a return water pipe is connected between the return water port of the heat source equipment and the water outlet port of the floor heating device.

[0008] The heat pump device comprises a water tank, a compressor, a main heat exchanger, a throttling device and a heat exchanger, the heat exchanger has a first heat exchange channel and a second heat exchange channel, the compressor, the main heat exchanger, the throttling device and the first heat exchange channel are sequentially connected in series to form a refrigerant circulation pipeline, and the main heat exchanger is used for heating water in the water tank.

[0009] The water inlet end and the water outlet end of the second heat exchange channel are connected to the water supply pipe or the return water pipe, a communication pipe is connected between the water supply pipe and the return water pipe, the return water pipe is sequentially provided with a first intersection point and a second intersection point along the water flow direction, the water inlet end of the second heat exchange channel is communicated with the first intersection point, and the water outlet end is communicated with the second intersection point.

[0010] The combined heating system has the beneficial effects that, due to the fact that the water inlet end and the water outlet end of the first heat exchange channel are connected to the return water pipe, the flow of the ground heating water flowing into the ground heating device will not change during the heating circulation, thereby avoiding the problem of flow fluctuation in the ground heating device caused by the flow of part of the ground heating water into the first heat exchange channel, improving the heating stability, and better meeting the simultaneous use requirements of the ground heating device and the heat pump device.

[0011] In one of the embodiments, a communication pipe is connected between the water supply pipe and the return water pipe, the intersection point of the communication pipe and the return water pipe is located downstream of the second intersection point, and the communication pipe can be selectively conducted.

[0012] In one of the embodiments, a one-way valve is arranged on the return water pipe, the one-way valve is located between the first intersection point and the second intersection point and only allows water to flow from the first intersection point to the second intersection point.

[0013] In one of the embodiments, a communication control valve is arranged on the communication pipe, and the communication control valve is used for controlling the on-off of the communication pipe.

[0014] In one of the embodiments, the water inlet end of the first heat exchange channel is communicated with the corresponding return water pipe or water inlet pipe by using a heat exchange water inlet pipe, the water outlet end of the first heat exchange channel is communicated with the corresponding return water pipe or water inlet pipe by using a heat exchange water outlet pipe, and a water pump is arranged on the heat exchange water inlet pipe or the heat exchange water outlet pipe.

[0015] In one of the embodiments, the water pump is a variable frequency water pump.

[0016] In one of the embodiments, the water tank comprises an inner container, the main heat exchanger is coiled outside the inner container, the heat pump device further comprises an auxiliary heat exchanger, the auxiliary heat exchanger is located inside the inner container and connected with the water outlet end of the heat exchange water inlet pipe, the water outlet end of the auxiliary heat exchanger is connected with the first heat exchange channel through a connecting pipe, a bypass pipe is connected between the connecting pipe and the heat exchange water inlet pipe, and the heat exchange water inlet pipe is selectively communicated with the bypass pipe or the auxiliary heat exchanger.

[0017] In one of the embodiments, the heat exchange water inlet pipe is provided with an inlet temperature detection member; and / or, the heat exchange water inlet pipe is provided with a switch valve.

[0018] In one of the embodiments, the water tank comprises an inner container, the main heat exchanger is coiled outside the inner container, and an electric heating member is arranged inside the inner container.

[0019] In one of the embodiments, the heat source equipment is a wall-hanging stove. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 A schematic view of a combined heat supply system in a first operation mode according to an embodiment of the present application;

[0021] Fig. 2 A schematic view of a combined heat supply system in a second operation mode according to an embodiment of the present application;

[0022] Fig. 3 A structural schematic view of a heat pump device according to an embodiment of the present application.

[0023] REFERENCE SIGNS:

[0024] 100, heat pump device; 200, floor heating device; 201, distribution water collector; 202, floor heating coil pipe; 300, heat source equipment; 400, water supply pipe; 500, water return pipe; 600, one-way valve; 700, communication pipe; 800, communication control valve; 900, water use end;

[0025] 1, water tank; 11, inner container; 12, tank shell;

[0026] 2, heat pump assembly; 21, compressor; 22, main heat exchanger; 23, throttling device; 24, heat exchanger; 25, evaporation temperature detection member; 26, first filter;

[0027] 3, heat exchange component; 31, heat exchange inlet pipe; 32, heat exchange outlet pipe; 33, auxiliary heat exchanger; 34, water pump; 35, inlet temperature detection piece; 36, bypass pipe; 37, three-way valve; 38, on-off valve; 39, outlet temperature detection piece; 310, connecting pipe;

[0028] 4, hot water outlet pipe; 5, cold water inlet pipe; 6, electric heating piece; 7, anode rod; 8, water tank temperature detection piece. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0030] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0031] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0032] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] As shown in the Figs. 1 to 3 The present embodiment provides a combined heating system, which can realize winter heating and heating of the water tank 1, while realizing summer cooling, improving the use experience of the combined heating system.

[0034] Specifically, the combined heating system comprises a heat source device 300, a floor heating device 200 and a heat pump device 100. The hot water outlet of the heat source device 300 is connected to the return water inlet of the floor heating device 200 through a water supply pipe 400, and the return water outlet of the heat source device 300 is connected to the water outlet of the floor heating device 200 through a return water pipe 500, so that the heat source device 300, the water supply pipe 400, the floor heating device 200 and the return water pipe 500 are sequentially connected to form a heating circulation loop.

[0035] The heat pump device 100 comprises a water tank 1, a heat pump assembly 2 and a heat exchange assembly 3. The heat pump assembly 2 comprises a compressor 21, a main heat exchanger 22, a throttling device 23 and a heat exchanger 24, the heat exchanger 24 has a first heat exchange channel and a second heat exchange channel, the compressor 21, the main heat exchanger 22, the throttling device 23 and the second heat exchange channel are sequentially connected to form a refrigerant circulation pipeline; the main heat exchanger 22 is used for heating the water in the water tank 1. The return water pipe 500 is sequentially provided with a first intersection point and a second intersection point along the water flow direction, and the water inlet end of the second heat exchange channel is communicated with the first intersection point and the water outlet end is communicated with the second intersection point.

[0036] The combined heating system provided by the embodiment can avoid the problem of internal flow fluctuation of the floor heating device 200 caused by the flow of part of the floor heating water to the first heat exchange channel, improve the heating stability, and better ensure the heating effect. At the same time, when the heat source device 300 is used to heat the floor heating device 200, the floor heating water flowing out of the floor heating device 200 can enter the first heat exchange channel and exchange heat with the refrigerant in the heat exchanger 24, so that the refrigerant can use the heating of the floor heating water to flow back to the compressor 21, realize the utilization of the waste heat of the floor heating water, and also avoid the problem of overloading of the compressor 21 caused by excessive heat absorption of the refrigerant in the heat exchanger 24 due to the excessively high temperature of the floor heating water, thereby improving the use safety and reliability of the combined heating system.

[0037] The water supply pipe 400 and the return water pipe 500 are connected by a communication pipe 700, the intersection point of the communication pipe 700 and the return water pipe 500 is located downstream of the second intersection point, and the communication pipe 700 can be selectively connected. The communication pipe 700, the first heat exchange channel and the floor heating device 200 can be sequentially connected to form a heat exchange circulation pipeline, and the communication pipe 700 can be selectively disconnected, so that part of the floor heating water in the heating circulation loop can flow back to the refrigerant circulation pipeline after being exchanged with the refrigerant in the second heat exchange channel.

[0038] Since the communication pipe 700 can be selectively turned on or turned off, and the water inlet end of the second heat exchange channel and the water outlet pipe are both connected to the return water pipe 500 or the water supply pipe 400, it is helpful to circulate the water supply in the heating circulation loop in the winter heating period to meet the user's heating demand. At this time, if the water in the water tank 1 needs to be heated, a part of the heating water can be extracted into the first heat exchange channel to exchange heat with the refrigerant, so that the refrigerant is warmed and flows back to the compressor 21, and the heating water is cooled, which helps to realize the heat utilization of the heating water. When the ground heating water temperature is relatively high and there is no heating demand in summer, the communication pipe 700 can be controlled to be turned on, so that the communication pipe 700, the first heat exchange channel and the ground heating device 200 are in circulation and form a refrigeration circulation loop. The ground heating water in the ground heating device 200 flows into the first heat exchange channel to exchange heat with the refrigerant, so that the refrigerant is warmed and the ground heating water is cooled at the same time. While meeting the heating demand of the water in the water tank 1, the cooled ground heating water can be circulated to various places in the room through the ground heating device 200, thereby helping to realize the refrigeration of the indoor environment. That is, the combined heating system provided by the embodiment can help to realize the functions of heating and hot water preparation, and is also beneficial to realize the indoor refrigeration function in summer, thereby improving the use experience of the combined heating system.

[0039] In an embodiment, the water inlet end and the water outlet end of the first heat exchange channel are both connected to the return water pipe 500, that is, in winter heating, the ground heating water flowing out of the ground heating device 200 enters the first heat exchange channel to participate in heat exchange, and then flows back to the return water pipe 500. This kind of setting can avoid the problem that the temperature of the ground heating water flowing out of the heat source equipment 300 is too high, which causes the temperature of the water in the first heat exchange channel to be too high, and further causes the refrigerant to absorb too much heat at the heat exchanger 24, thereby avoiding the problem that the temperature of the refrigerant flowing back to the compressor 21 is too high and causes overload. In other embodiments, the water inlet end and the water outlet end of the first heat exchange channel can also be connected to the water supply pipe 400.

[0040] In an embodiment, the return water pipe 500 is provided with a first intersection point, a second intersection point and a third intersection point, the water inlet end of the second heat exchange channel is communicated with the first intersection point, the water outlet end of the second heat exchange channel is communicated with the second intersection point, one end of the communication pipe 700 is communicated with the third intersection point, and the first intersection point, the second intersection point and the third intersection point are sequentially and separately arranged along the water flow direction in the return water pipe 500. The return water pipe 500 is provided with a one-way valve 600, and the one-way valve 600 is located between the first intersection point and the second intersection point and only allows water to flow from the first intersection point to the second intersection point.

[0041] That is, in the embodiment, the combined heating system has a first operating mode and a second operating mode:

[0042] That is, when the combined heating system is in the first operation mode, the hot water generated by the heat source device 300 is supplied to the floor heating device 200 through the water supply pipe 400 and is cooled in the floor heating device 200 to cool the floor heating water and to heat the indoor environment, and the cooled floor heating water flows to the return water pipe 500, and part of the return flow of the floor heating water directly returns to the heat source device 300 through the first, second and third junction points; part of the return flow of the floor heating water flows to the first heat exchange channel at the first junction point, is further cooled after heat exchange with the refrigerant in the second heat exchange channel, and returns to the return water pipe 500 through the second junction point, and then returns to the heat source device 300 to be further heated.

[0043] When the combined heating system is in the operation mode, the heat source device 300 stops running, the floor heating water in the floor heating device 200 flows into the first junction point through the return flow pipe, and then part of the floor heating water directly flows to the second junction point through the return water pipe 500, and part of the floor heating water enters the first heat exchange channel after heat exchange at the first junction point, and then the floor heating water at the second junction point flows to the floor heating device 200 through the communication pipe 700 and the water supply pipe 400.

[0044] By arranging the one-way valve 600, the one-way valve 600 only allows the flow of the floor heating water from the first junction point to the second junction point, so that the water flowing out of the second junction point from the first heat exchange channel cannot flow to the first junction point to form a circulation of the water flow among the first junction point, the first heat exchange channel and the second junction point, and the overall circulation of the floor heating water in the heat exchange circulation pipeline is ensured, thereby ensuring the heat exchange effect.

[0045] In other embodiments, the water supply pipe 400 is provided with the first, second and third junction points, the water inlet end of the second heat exchange channel is communicated with the first junction point and the water outlet end is communicated with the second junction point, one end of the communication pipe 700 is communicated with the third junction point, and the third, first and second junction points are arranged in sequence along the flow direction of the water flow in the water supply pipe 400; the water supply pipe 400 is provided with the one-way valve 600, and the one-way valve 600 is located between the first and second junction points and only allows the flow of the water from the first junction point to the second junction point.

[0046] The heat exchange device comprises a heat exchange assembly 3, and the heat exchange assembly 3 comprises a heat exchange water inlet pipe 31 and a heat exchange water outlet pipe 32. The inlet end of the first heat exchange channel is connected to the first junction point through the heat exchange water inlet pipe 31, and the outlet end of the first heat exchange channel is connected to the second junction point through the heat exchange water outlet pipe 32.

[0047] In order to ensure the smooth flow of the water in the first heat exchange channel, in an embodiment, the heat exchange water inlet pipe 31 and the heat exchange water outlet pipe 32 are provided with a water pump 34, and the water pump 34 is used to provide a driving force for the flow of the floor heating water in the heating circulation pipeline to the first heat exchange channel.

[0048] In an embodiment, the water pump 34 is arranged on the heat exchange water inlet pipe 31 to enhance the driving force of the water in the heating circulation pipeline. In other embodiments, the water pump 34 can also be arranged on the heat exchange water outlet pipe 32.

[0049] In an embodiment, the water pump 34 is a variable frequency water pump 34, so that the frequency of the water pump 34 can be adjusted to control the flow of the floor heating water entering the first heat exchange channel and control the heat released by the floor heating water at the heat exchanger 24.

[0050] To control the on-off of the communication pipe 700, in an embodiment, a communication control valve 800 is arranged on the communication pipe 700, which controls the on-off of the communication pipe 700, so that when the floor heating device 200 is used for heating in winter, the communication control valve 800 is closed, i.e. the communication pipe 700 is disconnected; when the heat exchanger 24 is used for heat exchange of the floor heating water for refrigeration in summer, the communication control valve 800 is opened, i.e. the communication pipe 700 is connected. By arranging the communication control valve 800, the on-off of the communication pipe 700 can be realized, the control logic is simplified, and the cost is reduced.

[0051] In other embodiments, a three-way valve 37 can also be arranged, two ports of the three-way valve 37 are connected in series to the water return pipe 500, and the other port of the three-way valve 37 is connected with the communication pipe 700; or two ports of the three-way valve 37 are connected in series to the water supply pipe 400, and the other port of the three-way valve 37 is connected with the communication pipe 700.

[0052] In an embodiment, the heat source device 300 is a wall-mounted stove, i.e. the heat source device 300 uses gas combustion to heat the water in the heat exchanger to heat the floor heating water. In other embodiments, the heat source device 300 can also be a heat pump unit or other device capable of heating the floor heating water.

[0053] It is worth noting that the floor heating device 200 includes a distribution water collector 201 and a plurality of floor heating coils 202, the distribution water collector 201 has a total water outlet and a total water inlet, and the floor heating device 200 realizes the supply and circulation of the floor heating water of the plurality of floor heating coils 202 through the distribution water collector 201, the water inlet end of the water return pipe 500 is communicated with the total water outlet of the distribution water collector 201, and the water outlet pipe of the water supply pipe 400 is communicated with the total water inlet of the distribution water collector 201. The specific structure of the floor heating device 200 can be limited by referring to the prior art, which is not the focus of the present application.

[0054] The water tank 1 comprises an inner container 11 with a water storage cavity, and the main heat exchanger 22 is coiled on the outer side of the inner container 11 to facilitate the arrangement of the heat pump assembly 2. To further improve the use performance of the combined heating system, the heat pump device 100 further comprises an auxiliary heat exchanger 33, which is located inside the water tank 1 and has a water inlet end connected with the water outlet end of the heat exchange water inlet pipe 31. The water outlet end of the auxiliary heat exchanger 33 is connected with the connecting pipe 310 of the first heat exchange channel. The bypass pipe 36 is connected between the connecting pipe 310 and the heat exchange water inlet pipe 31. The heat exchange water inlet pipe 31 is selectively communicated with the bypass pipe 36 or the auxiliary heat exchanger 33.

[0055] The above arrangement enables the floor heating water entering from the heat exchange water inlet pipe 31 to first enter the auxiliary heat exchanger 33 when the heat exchange inlet temperature of the floor heating water at the heat exchange water inlet pipe 31 is higher than the temperature of the water in the water tank 1, so that the water in the water storage cavity is heated and the floor heating water is cooled, which can better utilize the heat of the floor heating water and improve the thermal efficiency of the heat pump device 100. When the heat exchange inlet temperature is lower than the temperature of the water in the water tank 1, the heat exchange water inlet pipe 31 is communicated with the bypass pipe 36, so that the floor heating water does not flow to the auxiliary heat exchanger 33 and the water in the water storage cavity for heat exchange, but directly passes through the bypass pipe 36 to the first heat exchange channel for heat exchange. This avoids the problem that the floor heating water cannot be effectively heat-exchanged with the water in the water storage cavity due to the low temperature of the floor heating water entering the heat pump device 100 or the high temperature of the water in the water storage cavity, reduces the energy consumption of the heat pump device 100, and ensures the operating efficiency of the heat pump device 100.

[0056] In an embodiment, the main heat exchanger 22 preferably adopts a micro-channel heat exchanger to reduce the overall footprint of the main heat exchanger 22, thereby reducing the overall size of the heat pump device 100 while ensuring the water storage volume of the water storage cavity, and reducing the cost of the heat pump device 100. The specific structure of the micro-channel heat exchanger and its installation structure on the water tank 1 can be set according to the existing technology, which is not the focus of the present application and will not be described here. The auxiliary heat exchanger 33 preferably adopts a coil heat exchanger, and the heat exchanger 24 is preferably a plate heat exchanger.

[0057] In an embodiment, the heat pump device 100 comprises a three-way valve 37, the first port and the second port of the three-way valve 37 are connected in series in the heat exchange water inlet pipe 31, the inlet end of the bypass pipe 36 is connected to the third port of the three-way valve 37, and the first port is selectively communicated with the second port or the third port. Thus, the communication between the heat exchange water inlet pipe 31 and the auxiliary heat exchanger 33 or the bypass pipe 36 is controlled by the three-way valve 37. Further, the three-way valve 37 is located outside the water tank 1.

[0058] In other embodiments, a first control valve can be arranged on the heat exchange water inlet pipe 31, a second control valve can be arranged on the bypass pipe 36, and the first control valve is arranged downstream of the intersection of the bypass pipe 36 and the heat exchange water inlet pipe 31, the first control valve is arranged outside the water tank 1, the first control valve controls the opening and closing of the heat exchange water inlet pipe 31 to the auxiliary heat exchanger 33, and the second control valve controls the opening and closing of the bypass pipe 36. Thus, the opening and closing of the heat exchange water inlet pipe 31 to the auxiliary heat exchanger 33 or the bypass pipe 36 is controlled by the first control valve and the second control valve.

[0059] To control the operation of the three-way valve 37, the heat pump assembly 2, and the water pump 34, the heat pump device 100 comprises a controller, and the compressor 21, the water pump 34, the throttling device 23, and the three-way valve 37 are in communication connection with the controller, so that the controller controls the operation of the compressor 21, the water pump 34, and the throttling device 23.

[0060] To detect the heat exchange inlet temperature of the floor heating water, the heat exchange water inlet pipe 31 is further provided with an inlet temperature detection member 35 for detecting the heat exchange inlet temperature of the floor heating water flowing into the heat exchange water inlet pipe 31, and the inlet temperature detection member 35 is in communication connection with the controller. To detect the temperature in the water tank 1, the water tank 1 is provided with a water tank 1 temperature detection member inside, and the water tank 1 temperature detection member is in communication connection with the controller.

[0061] The heat exchange water inlet pipe 31 is further provided with a switch valve 38 to control the opening and closing of the heat exchange water inlet pipe 31. The switch valve 38 is preferably arranged downstream of the inlet temperature detection member 35. The switch valve 38 is in communication connection with the controller.

[0062] In an embodiment, the heat exchange water outlet pipe 32 is provided with an outlet temperature detection member 39 for detecting the temperature of the heat exchange outlet, so as to avoid the risk of freezing of the floor heating water flowing out of the heat exchange water outlet pipe 32 after heat exchange. The outlet temperature detection member 39 is in communication connection with the controller.

[0063] To further improve the operation safety and reliability of the heat pump device 100, in an embodiment, an evaporation temperature detection member 25 is arranged on the heat pump pipeline, and the evaporation temperature detection member 25 is arranged between the throttling device 23 and the second heat exchange channel to detect the temperature of the refrigerant flowing to the second heat exchange channel, and the evaporation temperature detection member 25 is in communication connection with the controller. The throttling device 23 is preferably an electronic expansion valve.

[0064] In an embodiment, the heat pump device 100 comprises a first filter 26 arranged on the heat pump pipeline and upstream of the inlet end of the throttling device 23 to filter impurities in the refrigerant flowing to the throttling device 23, so as to avoid the impurities from blocking the throttling device 23 and improve the operation safety of the heat pump assembly 2 and the heat pump device 100. Further, the heat pump device 100 further comprises a second filter arranged upstream of the first heat exchange channel to filter the floor heating water flowing to the first heat exchange channel, so as to avoid the impurities in the first heat exchange channel from causing the first heat exchange channel to be blocked.

[0065] In an embodiment, the water tank 1 further comprises a tank shell 12, the heat pump assembly 2 is located between the inner container 11 and the tank shell 12, the heat exchange water inlet pipe 31, the heat exchange water outlet pipe 32 and the heat exchanger 24 are located between the tank shell 12 and the water tank 1, and the water inlet end of the heat exchange water inlet pipe 31 and the water outlet end of the heat exchange water outlet pipe 32 both extend outside the tank shell 12 to be connected with the external heating system.

[0066] The heat pump device 100 further comprises a hot water outlet pipe 4 and a cold water inlet pipe 5, both of which are arranged outside the tank shell 12 and are inserted into the water tank 1, the cold water inlet pipe 5 is connected with the cold water supply pipe 400, and the hot water outlet pipe 4 is connected with the water consumption end 900.

[0067] In an embodiment, the heat pump device 100 further comprises an electric heating element 6 arranged inside the water tank 1 to heat the water in the water tank 1 by electrification, so as to serve as an auxiliary heating mode of the heat pump device 100, so that the heat pump device 100 can ensure the outlet water temperature when the heat pump assembly 2 fails to heat the water tank 1 or the water in the water tank 1 is not heated enough, and improve the use reliability of the heat pump device 100. The electric heating element 6 is in communication connection with the controller.

[0068] Further, the inner container 11 is further provided with a water tank temperature detection element 8 to detect the water temperature inside the inner container 11. The water tank 1 is further provided with an anode rod 7 to reduce the probability of scaling and corrosion inside the water tank 1, improve the operation safety of the heat pump device 100 and prolong the service life of the heat pump device 100.

[0069] In the specific content of the above specific embodiments, any technically consistent combination of technical features can be combined, and in order to make the description concise, not all possible combinations of the above technical features are described, but as long as the combination of technical features does not exist, it should be considered as the scope of the description.

[0070] The specific contents of the foregoing specific embodiments are only to express several embodiments of the utility model, and the description is more specific and detailed, but it cannot be understood as the limitation of the utility model patent scope. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A combined heat supply system, characterized in that The system comprises a heat source device (300), a floor heating device (200) and a heat pump device (100), a water supply pipe (400) is connected between the hot water outlet of the heat source device (300) and the return water inlet of the floor heating device (200), and a return water pipe (500) is connected between the return water outlet of the heat source device (300) and the water outlet of the floor heating device (200); The heat pump device (100) comprises a water tank (1), a compressor (21), a main heat exchanger (22), a throttling device (23) and a heat exchanger (24), the heat exchanger (24) has a first heat exchange channel and a second heat exchange channel, the compressor (21), the main heat exchanger (22), the throttling device (23) and the first heat exchange channel are sequentially connected end to end to form a refrigerant circulation pipeline, the main heat exchanger (22) is used for heating water in the water tank (1), the return water pipe (500) is sequentially provided with a first intersection point and a second intersection point along the water flow direction, and the water inlet end of the second heat exchange channel is communicated with the first intersection point and the water outlet end is communicated with the second intersection point.

2. The combined heating system according to claim 1, characterized in that The water supply pipe (400) and the return water pipe (500) are connected with a communication pipe (700), the intersection point of the communication pipe (700) and the return water pipe (500) is located downstream of the second intersection point, and the communication pipe (700) can be selectively conducted.

3. The combined heating system according to claim 2, wherein A one-way valve (600) is arranged on the return water pipe (500), the one-way valve (600) is located between the first intersection point and the second intersection point and only allows water to flow from the first intersection point to the second intersection point.

4. The combined heating system of claim 2, wherein A communication control valve (800) is arranged on the communication pipe (700), and the communication control valve (800) is used for controlling the on-off of the communication pipe (700).

5. Combined heating system according to any of claims 1-4, characterized in that The water inlet end of the first heat exchange channel is communicated with a heat exchange water inlet pipe (31) corresponding to the return water pipe (500) or a water inlet pipe, the water outlet end of the first heat exchange channel is communicated with a heat exchange water outlet pipe (32) corresponding to the return water pipe (500) or a water inlet pipe, and a water pump (34) is arranged on the heat exchange water inlet pipe (31) or the heat exchange water outlet pipe (32).

6. The combined heating system according to claim 5, wherein The water pump (34) is a variable frequency water pump.

7. The combined heating system of claim 5, wherein The water tank (1) comprises an inner container (11), the main heat exchanger (22) is coiled on the outside of the inner container (11), the heat pump device (100) further comprises an auxiliary heat exchanger (33), the auxiliary heat exchanger (33) is located in the inner container (11) and the water inlet end is connected with the water outlet end of the heat exchange water inlet pipe (31), the water outlet end of the auxiliary heat exchanger (33) is connected with the first heat exchange channel through a connecting pipe (310), a bypass pipe (36) is connected between the connecting pipe (310) and the heat exchange water inlet pipe (31), and the heat exchange water inlet pipe (31) is selectively conducted with the bypass pipe (36) or the auxiliary heat exchanger (33).

8. The combined heating system of claim 5, wherein, The heat exchange water inlet pipe (31) is provided with an inlet temperature detection member (35); and / or, the heat exchange water inlet pipe (31) is provided with an on-off valve (38).

9. The combined heating system according to any one of claims 1 to 4, characterized in that The water tank (1) comprises an inner container (11), the main heat exchanger (22) is coiled on the outer side of the inner container (11), and an electric heating element (6) is arranged in the inner container (11).

10. The combined heating system according to any one of claims 1 to 4, characterized in that The heat source equipment (300) is a wall-hanging stove.

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