CN214333105U - Waterway system of heat pump unit - Google Patents

Abstract

The utility model discloses a heat pump set waterway system, include: the heat pump main machine comprises a water-end heat exchanger; the water end heat exchanger comprises a main machine water inlet and a main machine water outlet; the water tank assembly comprises two or three or more than three water tanks which are connected in sequence; the first pipeline comprises a first main pipe connected with the water outlet of the host machine and a first branch pipe; two ends of the first branch pipe are respectively connected with the first main pipe and the head end water tank; a second pipeline including a second main pipe and a second branch pipe; one end of the second main pipe is connected with a water inlet of the main machine; one end of the second branch pipe is connected with the second main pipe, and the other end of the second branch pipe is communicated with a tail end water tank of the water tank assembly; and the circulating water pump is arranged on the second main pipe. In the waterway system of the heat pump unit, a plurality of water tanks are connected in series to enlarge the volume of the water tanks, so that the production and the transportation are convenient; the water tank quantity can be adjusted according to actual requirements by a user, the operation of the system cannot be influenced when the water tank quantity is adjusted, and the use is more flexible and convenient.

Description

Waterway system of heat pump unit

Technical Field

The utility model relates to a heat pump equipment technical field especially relates to a heat pump set water route system.

Background

A heat pump, which is a device for transferring heat energy of a low-level heat source to a high-level heat source; the heat sources can be classified into: air source heat pump, water source heat pump, ground source heat pump, etc. The air source heat pump water heater takes electric energy as power, heat is absorbed from a low-temperature side to heat domestic water, and hot water is sent to a user through a conveying system to be used as hot water supply or a fan coil is used for heating.

In places such as school dormitories, factory dormitories, hotels and the like, a large amount of hot water needs to be supplied in a centralized manner. In the prior art, a large-capacity water tank is generally equipped for a heat pump water heater to meet the requirement of large water supply. However, configuring a large-capacity water tank has the following drawbacks: firstly, if an open water tank is configured, a heat insulation structure layer needs to be processed on site, and foaming needs to be carried out on site, so that the quality of the water tank is not easy to guarantee, and the open water tank cannot guarantee the cleanliness of a water body; secondly, if the closed pressure-bearing water tank is configured, the water tank needs to be manufactured in a factory and then transported to the site, and the large-capacity water tank is large in size and high in transportation cost.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an aim at: the heat pump set waterway system can meet the requirement of large water consumption, is convenient to produce and transport, and is simple to control and convenient to use.

In order to achieve the purpose, the utility model adopts the following technical proposal:

a heat pump set waterway system comprises:

the heat pump main machine comprises a water-end heat exchanger; the water end heat exchanger comprises a main machine water inlet and a main machine water outlet;

the water tank assembly comprises two or three or more than three water tanks which are connected in sequence; the adjacent water tanks are connected through connecting pipes;

the first pipeline comprises a first main pipe connected with the water outlet of the main machine and a first branch pipe; a water supply port is arranged on the first main pipe; one end of the first branch pipe is connected with the first main pipe, and the other end of the first branch pipe is communicated with a head end water tank of the water tank assembly;

a second pipeline including a second main pipe and a second branch pipe; one end of the second main pipe is connected with the water inlet of the main machine, and the other end of the second main pipe is used for being connected with external water supply equipment; one end of the second branch pipe is connected with the second main pipe, and the other end of the second branch pipe is communicated with a tail end water tank of the water tank assembly;

the circulating water pump is arranged on the second main pipe; the heat pump unit water path system is a circulating heat pump unit water path system or a circulating directly-heated heat pump unit water path system.

Preferably, between adjacent water tanks, the bottom of the former water tank is communicated with the top of the latter water tank through the connecting pipe.

Preferably, when the water path system of the heat pump unit is a water path system of the circulating directly-heated heat pump unit; the heat pump set waterway system further comprises a warm water valve, the warm water valve is arranged in the second main pipe, and the warm water valve is arranged between the water inlet of the main machine and the second branch pipe.

Preferably, when the water path system of the heat pump unit is a water path system of the circulating directly-heated heat pump unit; the waterway system of the heat pump unit also comprises a valve module, the valve module is arranged on the second main pipe, and the valve module is arranged between the water inlet of the host and the second branch pipe;

the valve module comprises two parallel water regulating valves, both of which are warm water valves, or one of the two water regulating valves is a warm water valve and the other is a manual regulating valve.

Preferably, when the water path system of the heat pump unit is a circulating water path system of the heat pump unit, the heat pump unit further comprises a temperature measuring element, and the temperature measuring element is arranged between the water inlet of the host and the second branch pipe.

Preferably, when the water path system of the heat pump unit is a water path system of the circulating direct-heating heat pump unit, the heat pump unit further comprises a return water temperature measuring element and an outlet water temperature measuring element; the backwater temperature measuring element is arranged on the second main pipe and is arranged between the water inlet of the main machine and the second branch pipe;

the water outlet temperature measuring element is arranged on the first main pipe and between the water outlet of the main machine and the first branch pipe.

Preferably, the system also comprises a water return pipeline; a second branch port is formed in the second main pipe, and the second branch pipe is connected with the second main pipe through the second branch port;

a third branch port is formed in the second main pipe, one end of the water return pipeline is connected with one end, far away from the water outlet of the main machine, of the first main pipe, and the second end of the water return pipeline is connected with the third branch port; the second branch port is positioned between the third branch port and the host water outlet.

Preferably, the water-saving device further comprises a water return pump, and the water return pump is arranged on the water return pipeline.

Preferably, the device further comprises a first check valve, a second check valve, a third check valve, a first electromagnetic valve and a second electromagnetic valve;

the first one-way valve and the first electromagnetic valve are arranged on the water return pipeline and are arranged between the water return pump and the second main pipe; the first one-way valve, when open, allows fluid flow from the direction to the second branch port;

the second check valve and the second electromagnetic valve are arranged in the second main pipe and are arranged between the second branch port and the water inlet of the main machine; when the second one-way valve is opened, fluid is allowed to flow towards the direction of the water inlet of the main machine;

an opening of one end of the second main pipe, which is far away from the water inlet of the host machine, is a water supply interface; the third one-way valve is arranged in the second main pipe and is arranged between the water supply interface and the third branch port; the third one-way valve, when open, allows fluid flow in the direction of the second branch port.

Preferably, the heat pump system further comprises a fixing frame, and the heat pump host, the water tank assembly, the first pipeline, the second pipeline and the circulating water pump are all fixed on the fixing frame.

The utility model has the advantages that: the waterway system of the heat pump unit enlarges the volume of the water tank by connecting the plurality of water tanks in series, and is more convenient to produce and transport; the water tank control system has the advantages that complex control elements are not required to be added, the control system is simple, the number of the water tanks in the water tank assembly can be adjusted according to actual requirements by a user, the operation of the system cannot be influenced when the number of the water tanks is adjusted, and the use is more flexible and convenient.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Fig. 1 is one of schematic structural diagrams of a water path system of a circulating direct heat pump unit according to an embodiment of the present invention;

fig. 2 is a second schematic structural view of a water path system of the circulation direct-heating heat pump unit according to the embodiment of the present invention;

FIG. 3 is a schematic view of a water path system of a circulating heat pump unit according to an embodiment of the present invention;

FIG. 4 is a second schematic view of the structure of the water path system of the circulating heat pump unit according to the embodiment of the present invention; (in the circulation heating mode)

FIG. 5 is a third schematic view of a water path system of a circulating heat pump unit according to an embodiment of the present invention; (in a water supply mode for supplying water to a user)

In the figure: 10. a heat pump host; 11. a water-side heat exchanger; 111. a water inlet of the main machine; 112. a water outlet of the host machine; 12. an evaporator; 13. an economizer; 14. a main expansion valve; 15. an auxiliary expansion valve; 16. a compressor; 17. a four-way valve; 20. a water tank assembly; 201. opening the temperature measurement; 21. a head end water tank; 22. a terminal water tank; 23. a connecting pipe; 31. a first main tube; 311. a first branch port; 32. a first branch pipe; 41. a second main pipe; 411. a second branch port; 412. a third branch port; 413. a water supply interface; 42. a second branch pipe; 51. a warm water valve; 52. a manual regulating valve; 60. a water return pipe; 71. a water circulating pump; 72. a water return pump; 81. a first check valve; 82. a second one-way valve; 83. a third check valve; 84. a first solenoid valve; 85. a second solenoid valve; 90. and (5) a water using device.

Detailed Description

In order to make the technical problems, technical solutions and technical effects achieved by the present invention more clear, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected" and "fixed" are to be understood broadly, e.g. as a fixed connection, a detachable connection or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In fig. 1 to 5, the direction of the arrow is the water flow direction.

The utility model provides a heat pump set water route system, it can satisfy the large water demand, and the production transportation is convenient to control is simple, uses more in a flexible way, and is more convenient.

As shown in fig. 1-5, in an embodiment of the water path system of the heat pump unit of the present invention, the water path system of the heat pump unit includes:

a heat pump main unit 10 including a water-side heat exchanger 11; the water-side heat exchanger 11 comprises a main machine water inlet 111 and a main machine water outlet 112; water to be heated enters the water end heat exchanger 11 from the main machine water inlet 111 and flows out of the water end heat exchanger 11 from the main machine water outlet 112, and the heat pump main machine 10 heats water flow;

a water tank assembly 20 including n water tanks connected in sequence, n being 2 or 3 or an integer greater than 3; the adjacent water tanks are connected through a plurality of connecting pipes 23;

a first pipe including a first main pipe 31 connected to the main unit water outlet 112, and a first branch pipe 32; a water supply port is arranged on the first main pipe 31; one end of the first branch pipe 32 is connected to the first main pipe 31, and the other end is communicated with the head end water tank 21 of the water tank assembly 20; the first branch pipe 32 is located between the water supply port and the main body water inlet 111;

a second pipe including a second main pipe 41 and a second branch pipe 42; one end of the second main pipe 41 is connected with the main machine water inlet 111, and the other end is used for being connected with external water supply equipment; one end of the second branch pipe 42 is connected with the second main pipe 41, and the other end is communicated with the tail end water tank 22 of the water tank assembly 20;

and a circulation water pump 71 provided in the second main pipe 41.

Specifically, in this embodiment, the water-side heat exchanger 11 further includes a working medium inlet and a working medium outlet, the heat exchange working medium enters the water-side heat exchanger 11 from the working medium inlet, and the heat exchange working medium is liquefied to release heat and then flows out of the water-side heat exchanger 11 from the working medium outlet; the water entering the water end heat exchanger 11 absorbs the heat emitted by the heat exchange working medium, and the water flows out from the outlet of the main machine after being heated.

Specifically, the first main pipe 31 is provided with a first branch opening 311, and the first branch pipe 32 is connected to the first main pipe 31 through the first branch opening 311.

The utility model discloses a heat pump set water route system, accessible circulation mode heats water, and the principle of circulation heating as follows:

an external water supply device is connected through the second main pipe 41, and the external water supply device supplies water to the heat pump main unit 10;

external water flow enters the water-end heat exchanger 11 from the second main pipe 41 and the main machine water inlet 111;

in the water inlet end heat exchanger 11, the heat exchange medium of the heat pump main unit 10 releases heat to heat water, and the heated water flows out of the heat pump main unit 10 from the main unit water outlet 112;

the water flow after the primary temperature rise sequentially passes through the first main pipe 31 and the first branch pipe 32 and enters the head end water tank 21 in the water tank assembly 20;

the water flow entering the water tank assembly 20 flows to the tail end water tank 22 through the connecting pipe 23 in sequence; until the water fills the water flow in the tank assembly 20;

the water subjected to the primary temperature rise in the tail end water tank 22 flows back to the second main pipe 41 through the second branch pipe 42, flows through the water inlet end heat exchanger 11 again for secondary heating temperature rise, and enters the water tank assembly 20 through the first branch pipe 32; the heating is circulated for many times until the water temperature rises to the preset temperature.

The utility model discloses a heat pump set water route system can be pure circulating heat pump set water route system, also can be circulation directly-heated heat pump set water route system.

As shown in fig. 3-5, in the water path system of the pure circulation heat pump unit, water is heated for multiple cycles until the temperature of the water in the head-end water tank 21 reaches a predetermined temperature, such as 40 degrees or 60 degrees, at this time, the water in the head-end water tank 21 is pumped to the first main pipe 31 by the operation of the water pump, so that water is supplied to the outside through the water supply port of the first main pipe 31.

The utility model discloses, through setting up a plurality of water tank series connection, the water tank adjacent with head end water tank 21 can in time supply the rivers in the head end water tank 21, satisfies the demand of big water consumption. And need not the field processing bulky water tank, also need not to transport bulky water tank, convenient to use, control is simple.

Further, the utility model discloses in, it is adjacent between the water tank, former the bottom and the back of water tank the top of water tank is passed through connecting pipe 23 intercommunication. Due to the arrangement, water communication between adjacent water tanks is facilitated; it should be noted that, in the water tank assembly 20, the forward water tank refers to the water tank near the first branch pipe 32.

As shown in fig. 1 and 2, in the water circuit system of the circulating direct-heating heat pump unit, an adjusting element is disposed in the second main pipe 41, and the adjusting element can be implemented in any one of the following manners to realize the heating function of circulating before direct heating:

first, the adjustment element is a single warm water valve 51; only one warm water valve 51 is arranged on the second main pipe 41, and the warm water valve 51 is arranged between the main machine water inlet 111 and the second branch pipe 42; the warm water valve 51 is an automatic warm water valve 51;

secondly, the regulating element is a valve module; a valve module is arranged on the second main pipe 41 and is arranged between the main machine water inlet 111 and the second branch pipe 42; the valve module comprises two automatic warm water valves 51 connected in parallel;

third, the regulating element is a valve module; a valve module is arranged on the second main pipe 41 and is arranged between the main machine water inlet 111 and the second branch pipe 42; the valve module comprises two parallel water regulating valves, wherein one water regulating valve is an automatic water valve, and the other water regulating valve is a manual regulating valve 52.

The utility model discloses, through being responsible for 41 at the second and setting up adjusting element, can realize the heating function of direct heat after earlier circulation, the principle is as follows:

firstly, operating a circulating heating mode until the water temperature is raised to t1, wherein t1 is the return water temperature, and switching the circulating heating mode into a direct heating mode;

specifically, when t2-t1 >. DELTA.t, t2 is the target set temperature, the valves of the regulating element are all opened, and the water flow is heated in a circulation heating mode;

when t2-t1 is Δ t, the circulation heating mode is switched to the direct heating mode, the valve in the adjusting element is operated, the opening degree is reduced, the water flow entering the heat pump main unit 10 in unit time is reduced, the heat pump main unit 10 directly heats the water flow to t2 and then sends the water flow out of the main unit water outlet 112, and the water flow which is heated at the moment is directly sent to the external water using equipment 90 through the water supply port of the second main pipe 41.

Further, Δ t is set to 5 to 20 degrees. In some embodiments, Δ t is set to 8-15 degrees. The utility model discloses a heat pump set water route system sets for delta t for 5-20 degrees.

In the present embodiment, t2 is 55 degrees Celsius and Δ t is 10 degrees Celsius. The valve or the valve module adopted in the scheme is used for controlling the water flow in the second main pipe 41, when the target set temperature t2 is 55 degrees (only for example), the water is heated in a circulating heating mode, when the return water temperature t1 reaches 45 degrees (only for example), the opening degree of the valve or the valve module is controlled to be reduced by the controller, the flow entering the heat pump main machine 10 is reduced, and at the moment, the heat pump can heat the water at 45 degrees to 55 degrees and directly output the heat.

According to the scheme, the value of delta t is reasonably set, a valve with a large flow regulation range is not required, a coarse regulation valve is adopted, only one warm water valve 51 is adopted, or two regulation valves are matched in parallel, the control is simplified, the cost of a control system is reduced, the situation of field trip caused by the design of a complex control system is avoided, the water demand of a user can be met, the operation is more reliable, and the faults are fewer.

It should be noted that, in other embodiments, t2 and Δ t may be set to specific values according to actual requirements.

In the second embodiment, two automatic warm water valves 51 are connected in parallel, so that the range of the single-time flow adjustment of the water valves can be increased.

In the third embodiment, the automatic valve is connected in parallel with the manual regulating valve 52, the manual regulating valve 52 can be normally opened at ordinary times, the water flow can be regulated only through the single automatic water valve, and the manual regulating valve 52 can realize a compensation regulating function in the actual use process. In addition, the manual regulating valve 52 is adopted, so that the opening degree does not need to be adjusted frequently in the operation process of the equipment, and a manual valve is adopted, so that the control system can be simplified, a compensation function can be provided, and the operation of a water path system of the heat pump unit is more flexible.

In the pure circulation type heat pump unit water path system, the heat pump unit water path system further comprises a temperature measuring element, the temperature measuring element is arranged between the host water inlet 111 and the second branch pipe 42, and the temperature measuring element is used for detecting the return water temperature, namely the temperature of water before the water flow enters the heat pump host 10.

In some embodiments, the heat pump unit water circuit system further includes a temperature measuring element disposed between the main unit water outlet 112 and the second branch pipe 32, and the temperature measuring element is used for detecting the temperature of water.

Preferably, the temperature measuring element is integrated inside the heat pump host 10, so that the assembly of the water path system of the heat pump unit is more convenient, and the temperature measuring element does not need to be additionally arranged on an external pipeline.

In the circulating directly-heated heat pump unit waterway system, the heat pump unit waterway system also comprises a backwater temperature measuring element and a water outlet temperature measuring element; the backwater temperature measuring element is arranged on the second main pipe 41 and between the water inlet 111 of the main machine and the second branch pipe 42, and is used for detecting the backwater temperature, namely the temperature of the backwater before the water flow enters the heat pump main machine 10; when the temperature of the return water reaches the preset temperature, switching the circulating heating mode into a direct heating mode;

the water outlet temperature measuring element is arranged between the water outlet 112 of the main machine and the first branch pipe 32 and is used for detecting the temperature of water, and the water outlet temperature is the temperature of water flowing out of the heat pump main machine 10; and when the outlet water temperature reaches the preset temperature, stopping the direct heating mode.

Preferably, the return water temperature measuring element and the outlet water temperature measuring element are integrated in the heat pump host 10, so that the assembly of the water path system of the heat pump unit is more convenient, and the temperature measuring element does not need to be additionally arranged on an external pipeline. Furthermore, the water circuit system of the heat pump unit also comprises a controller which is electrically connected with the temperature measuring element and the circulating water pump 71. The controller is used for receiving the temperature information measured by the temperature measuring element and comparing the temperature information sent by the temperature measuring element with a preset temperature.

Specifically, in the water circuit system of the circulating direct heat pump unit, the controller is electrically connected to the warm water valve 51, and the controller is configured to control the opening degree of the warm water valve 51 to be reduced when t2-t1 is Δ t.

Further, in order to save water and facilitate recovery of excess water in the first main pipe 31, the water path system of the heat pump unit further includes a water return pipe 60, a second branch port 411 is provided on the second main pipe 41, and the second branch pipe 42 is connected with the second main pipe 41 through the second branch port 411;

a third branch port 412 is arranged on the second main pipe 41, one end of the water return pipe 60 is connected with one end of the first main pipe 31 far away from the main machine water outlet 112, and the second end is connected with the third branch port 412; the second branch port 411 is located between the third branch port 412 and the host outlet port 112.

Further, in order to provide the water return power, the water circuit system of the heat pump unit further comprises a water return pump 72, and the water return pump 72 is arranged on the water return pipe 60.

Further, a first check valve 81, a second check valve 82, a third check valve 83 and a first solenoid valve 84 are included;

the first check valve 81 and the first electromagnetic valve 84 are disposed in the water return pipe 60 and between the water return pump 72 and the second main pipe 41; when the first check valve 81 is opened, fluid is allowed to flow from the direction toward the second branch port 411;

the second check valve 82 is arranged in the second main pipe 41 and between the second branch port 411 and the main machine water inlet 111; the second one-way valve 82, when open, allows fluid flow in the direction of the host water inlet 111.

Further, the opening of the second main pipe 41 at the end far away from the main water inlet 111 is a water supply interface 413; the third check valve 83 is disposed in the second main pipe 41 and between the water supply port 413 and the third branch port 412; the third check valve 83 is opened to allow the fluid to flow in the direction of the second branch port 411.

Further, the heat pump system further comprises a fixing frame, and the heat pump main unit 10, the water tank assembly 20, the first pipeline, the second pipeline and the circulating water pump 71 are all fixed on the fixing frame.

In the utility model, the controller controls the water return pump 72 to be opened when the water temperature in the water pipe is low and to be closed when the water temperature is increased; the first check valve 81 is opened when water returns, and is closed at other times; the controller controls the first electromagnetic valve 84 and the water return pump 72 to be on and off simultaneously; the third check valve 83 is opened when water needs to be supplied to the heat pump main unit 10 or replenished to the tail end water tank 22 through the first main pipe 31; the second check valve 82 is opened at the time of returning water and closed at other times.

Further, a second electromagnetic valve 85 is provided in the second main pipe 41.

Further, as shown in fig. 1 to 5, in the present embodiment, the heat pump main unit 10 further includes an evaporator 12, an economizer 13, a main expansion valve 14, an auxiliary expansion valve 15, a compressor 16, and a four-way valve 17. The evaporator 12 is a fin heat exchanger, and the evaporator 12 is used for realizing heat exchange between a heat exchange working medium and an external heat source so as to realize heat absorption of the heat exchange working medium.

Furthermore, a temperature measurement opening 201 is further arranged in a water tank in the water tank assembly 20 of the water path system of the circulating heat pump unit or the water path system of the circulating direct heat pump unit, and the temperature measurement opening 201 is applied in water temperature test; when the user is using water, utilize temperature measurement opening 201 to judge the water tank temperature, when the water tank temperature was too low, the heat pump host computer can restart. Of course, in other embodiments, the thermometric opening 201 may not be provided.

In the description herein, it is to be understood that the terms "upper", "lower", "left", "right", and the like are used in a descriptive sense and with reference to the illustrated orientation or positional relationship, and are used for convenience in description and simplicity in operation, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used merely for descriptive purposes and are not intended to have any special meaning.

In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.

The technical principle of the present invention is described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without any inventive effort, which would fall within the scope of the present invention.

Claims (10)

1. A heat pump set waterway system is characterized by comprising:

a heat pump main unit (10) including a water-side heat exchanger (11); the water-end heat exchanger (11) comprises a main machine water inlet (111) and a main machine water outlet (112);

a water tank assembly (20) including two or three or more water tanks connected in sequence; the adjacent water tanks are connected through a connecting pipe (23);

a first pipe comprising a first main pipe (31) connected to the main unit water outlet (112), and a first branch pipe (32); a water supply port is arranged on the first main pipe (31); one end of the first branch pipe (32) is connected with the first main pipe (31), and the other end of the first branch pipe is communicated with a head end water tank (21) of the water tank assembly (20);

a second duct comprising a second main pipe (41) and a second branch pipe (42); one end of the second main pipe (41) is connected with the water inlet (111) of the main machine, and the other end of the second main pipe is used for being connected with external water supply equipment; one end of the second branch pipe (42) is connected with the second main pipe (41), and the other end of the second branch pipe is communicated with a tail end water tank (22) of the water tank assembly (20);

a circulating water pump (71) provided in the second main pipe (41);

the heat pump unit water path system is a circulating heat pump unit water path system or a circulating directly-heated heat pump unit water path system.

2. A water circuit system of heat pump unit according to claim 1, characterized in that the bottom of the former water tank is communicated with the top of the latter water tank through the connecting pipe (23) between the adjacent water tanks.

3. The heat pump unit water circuit system of claim 1, wherein when the heat pump unit water circuit system is a cyclic direct heat pump unit water circuit system; the heat pump unit waterway system further comprises a warm water valve (51), the warm water valve (51) is arranged in the second main pipe (41), and the warm water valve (51) is arranged between the host water inlet (111) and the second branch pipe (42).

4. The heat pump unit water circuit system of claim 1, wherein when the heat pump unit water circuit system is a cyclic direct heat pump unit water circuit system; the waterway system of the heat pump unit also comprises a valve module, the valve module is arranged on the second main pipe (41), and the valve module is arranged between the water inlet (111) of the main machine and the second branch pipe (42);

the valve module comprises two water regulating valves connected in parallel, wherein the two water regulating valves are warm water valves (51), or one of the two water regulating valves is a warm water valve (51) and the other is a manual regulating valve (52).

5. The heat pump unit waterway system of claim 1, wherein when the heat pump unit waterway system is a circulating heat pump unit waterway system, the waterway system further comprises a temperature measuring element, and the temperature measuring element is arranged between the water inlet (111) of the host and the second branch pipe (42).

6. The heat pump unit waterway system of claim 1, further comprising a return water temperature measuring element and an outlet water temperature measuring element when the heat pump unit waterway system is a circulating direct heat pump unit waterway system; the backwater temperature measuring element is arranged between the water inlet (111) of the main machine and the second branch pipe (42);

the water outlet temperature measuring element is arranged between the water outlet (112) of the main machine and the first branch pipe (32).

7. A heat pump unit water circuit system according to any one of claims 1-6, characterized in that it further comprises a return pipe (60); a second branch port (411) is formed in the second main pipe (41), and the second branch pipe (42) is connected with the second main pipe (41) through the second branch port (411);

a third branch port (412) is formed in the second main pipe (41), one end of the water return pipe (60) is connected with one end, far away from the main machine water outlet (112), of the first main pipe (31), and the second end of the water return pipe is connected with the third branch port (412); the second branch port (411) is located between the third branch port (412) and the host water outlet (112).

8. A heat pump unit water circuit system according to claim 7, characterized in that, further comprises a water return pump (72), and the water return pump (72) is arranged on the water return pipe (60).

9. The waterway system of the heat pump unit of claim 8, further comprising a first check valve (81), a second check valve (82), a third check valve (83), a first solenoid valve (84) and a second solenoid valve (85);

the first check valve (81) and the first electromagnetic valve (84) are arranged on the water return pipeline (60) and are arranged between the water return pump (72) and the second main pipe (41); the first check valve (81) allows fluid to flow from the direction to the second branch port (411) when opened;

the second one-way valve (82) and the second electromagnetic valve (85) are arranged in the second main pipe (41) and between the second branch port (411) and the main machine water inlet (111); the second one-way valve (82) allows fluid to flow in the direction of the main machine water inlet (111) when opened;

an opening of one end, far away from the main machine water inlet (111), of the second main pipe (41) is a water supply interface (413); the third check valve (83) is arranged in the second main pipe (41) and is arranged between the water supply interface (413) and the third branch port (412); the third check valve (83) allows fluid to flow in the direction of the second branch port (411) when opened.

10. The heat pump unit waterway system of claim 1, further comprising a fixing frame, wherein the heat pump main unit (10), the water tank assembly (20), the first pipeline, the second pipeline and the circulating water pump (71) are all fixed on the fixing frame.

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