CN118882239A - Heat Pump System - Google Patents

Abstract

The embodiment of the invention discloses a heat pump system, which comprises: the indoor heat exchanger is internally provided with a first indoor flow path and a second indoor flow path, and the first indoor flow path, the outdoor heat exchanger and the first compressor are distributed in series; the system comprises a plate heat exchanger and an oil-free compressor, wherein a first plate exchange flow path and a second plate exchange flow path are formed in the plate heat exchanger, the first plate exchange flow path is connected with a geothermal system in series, and the oil-free compressor is connected with a second indoor flow path in series; wherein the second plate heat exchanger flow path is adapted to be selectively connected in series between the first indoor flow path and the outdoor heat exchanger, or selectively connected in series between the oil-free compressor and the second indoor flow path. The heat pump system provided by the embodiment of the invention can lighten the load of the first compressor, prolong the service life of the first compressor, ensure the indoor heat supply, further ensure the indoor comfort level, and has better use effect and wider application range.

Description

Heat Pump System

Technical Field

The invention relates to the technical field of heating, and in particular to a heat pump system.

Background Art

Heat pumps are now widely used. They are mechanical devices that force heat to flow from low-temperature objects to high-temperature objects in a reverse Carnot cycle. They are mainly composed of four parts: a compressor, a condenser, a throttle valve and an evaporator. They only consume a small amount of reverse cycle net work to obtain a large amount of heating supply. They can effectively utilize low-grade thermal energy that is difficult to use, thereby achieving energy saving purposes.

The existing heat pump system can realize functions such as indoor cooling, heating and defrosting of the outdoor heat exchanger through the outdoor heat exchanger, geothermal system and indoor heat exchanger. However, the existing heat pump system only has one compressor involved in all processes, which causes the compressor to be overloaded, affecting the service life of the compressor. In addition, when the indoor heat exchanger is defrosted, it will affect the indoor heating. There is room for improvement.

Summary of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a heat pump system, which can reduce the load of the first compressor, extend the service life of the first compressor, and ensure the indoor heat supply, thereby ensuring the indoor comfort.

According to an embodiment of the present invention, the heat pump system includes: a first compressor, an indoor heat exchanger and an outdoor heat exchanger, wherein the indoor heat exchanger is provided with a first indoor flow path and a second indoor flow path, and the first indoor flow path, the outdoor heat exchanger and the first compressor are connected in series; a plate heat exchanger and an oil-free compressor, wherein the plate heat exchanger is provided with a first plate flow path and a second plate flow path, the first plate flow path is connected in series with a geothermal system, and the oil-free compressor is connected in series with the second indoor flow path; wherein the second plate flow path is suitable for being selectively connected in series between the first indoor flow path and the outdoor heat exchanger, or selectively connected in series between the oil-free compressor and the second indoor flow path.

According to the heat pump system of the embodiment of the present invention, an oil-free compressor is provided, which can act on the second indoor flow path, thereby reducing the load of the first compressor and extending the service life of the first compressor, and can be selectively connected with the first indoor flow path and the second indoor flow path through the second plate exchange path, so that the first compressor or the oil-free compressor can supply heat to the indoor heat exchanger to ensure the indoor heating amount, thereby ensuring the indoor comfort, with better use effect and wider application range.

According to some embodiments of the present invention, the heat pump system further includes a connecting branch, which is connected in parallel with the second plate exchanger circuit, and one of the connecting branch and the second plate exchanger circuit is selectively connected between the first indoor flow path and the outdoor heat exchanger.

The heat pump system according to some embodiments of the present invention further includes:

a first three-way valve, wherein the first three-way valve is provided with a first three-way first valve port, a first three-way second valve port and a first three-way third valve port, wherein the first three-way first valve port is communicated with the outdoor heat exchanger, the first three-way second valve port is communicated with one end of the connecting branch, the first three-way third valve port is communicated with the second plate exchange path, and the first three-way second valve port and the first three-way third valve port are both arranged to selectively communicate with the first three-way first valve port;

A second three-way valve, the second three-way valve is provided with a second three-way first valve port, a second three-way second valve port and a second three-way third valve port, the second three-way first valve port is connected with the second plate exchange flow path, the second three-way second valve port is connected with the first indoor flow path, the second three-way third valve port is connected with the second indoor flow path, the second three-way second valve port and the second three-way third valve port are both arranged to selectively connect with the second three-way first valve port.

According to some embodiments of the present invention, the heat pump system further includes a cooling flow path, which is used to pass part of the refrigerant flowing out of the first compressor into the space where the motor of the first compressor is located and/or the space where the bearing of the first compressor is located.

According to the heat pump system of some embodiments of the present invention, the cooling flow path includes a first cooling branch and/or a second cooling branch;

Among them, the inlet end of the first cooling branch is connected between the outdoor heat exchanger and the first compressor or between the first indoor flow path and the first compressor, and the outlet end of the first cooling branch is connected to the space where the bearing of the first compressor is located, the inlet end of the second cooling branch is connected between the outdoor heat exchanger and the second plate exchange path or between the first indoor flow path and the first compressor, and the outlet end of the second cooling branch is connected to the space where the motor of the first compressor is located.

In the heat pump system according to some embodiments of the present invention, a first gas-liquid separator is provided in the first cooling branch, an intermediate flow path is connected between the first cooling branch upstream of the first gas-liquid separator and the second cooling branch, and the refrigerant in the first cooling branch is suitable for flowing into the second cooling branch through the intermediate flow path.

According to the heat pump system of some embodiments of the present invention, a second gas-liquid separator is also provided at the inlet end of the first compressor, and the second gas-liquid separator is connected to a return flow path. The refrigerant in the space where the bearing is located after cooling the bearing and the refrigerant in the space where the motor is located after cooling the motor are suitable for flowing from the return flow path to the second gas-liquid separator.

According to some embodiments of the present invention, the heat pump system further includes a four-way valve, which is used to connect the first compressor, the first indoor flow path and the outdoor heat exchanger in sequence along the refrigerant flow direction or to connect the first compressor, the outdoor heat exchanger and the first indoor flow path in sequence along the refrigerant flow direction.

According to the heat pump system of some embodiments of the present invention, a liquid storage tank and an expansion valve are further provided between the first indoor flow path and the outdoor heat exchanger.

According to the heat pump system of some embodiments of the present invention, a third gas-liquid separator is further provided at the inlet end of the oil-free compressor, and the third gas-liquid separator is connected between the second indoor flow path and the oil-free compressor.

Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

FIG1 is a schematic diagram of a heat pump system according to an embodiment of the present invention;

FIG2 is a schematic structural diagram of a four-way valve according to an embodiment of the present invention;

3 is a schematic structural diagram of a first three-way valve according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a second three-way valve according to an embodiment of the present invention.

Reference numerals:

Heat pump system 100,

first compressor 1, manual butterfly valve 11, indoor heat exchanger 2, first indoor flow path 21, liquid storage tank 211, expansion valve 212, second indoor flow path 22, third gas-liquid separator 221, building water circulation system 23, outdoor heat exchanger 3, fan 31, plate heat exchanger 4, first plate exchange path 41, electric butterfly valve 411, geothermal system 412, second plate exchange path 42, oil-free compressor 421, connecting branch 5,

The first three-way valve 6, the first three-way first valve port 61, the first three-way second valve port 62, the first three-way third valve port 63, the second three-way valve 7, the second three-way first valve port 71, the second three-way second valve port 72, the second three-way third valve port 73,

The first cooling branch 81, the first gas-liquid separator 811, the second cooling branch 82, the intermediate flow path 83, the reflux flow path 84, the second gas-liquid separator 841, the sight glass 91, the filter 92, the four-way valve 93, the four-way first valve port 931, the four-way second valve port 932, the four-way third valve port 933, the four-way fourth valve port 934, the throttle valve 94, the stop valve 95, the one-way valve 96, the switch 97, the water pump 98, the drain branch 99, and the drain valve 991.

DETAILED DESCRIPTION

Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

The heat pump system 100 according to an embodiment of the present invention is described below with reference to FIGS. 1 to 4 , which can reduce the load of the first compressor 1 , extend the service life of the first compressor 1 , and ensure the indoor heating amount, thereby ensuring the indoor comfort.

As shown in FIGS. 1 to 4 , a heat pump system 100 according to an embodiment of the present invention includes: a first compressor 1 , an indoor heat exchanger 2 , an outdoor heat exchanger 3 , a plate heat exchanger 4 and an oil-free compressor 421 .

A first indoor flow path 21 and a second indoor flow path 22 are formed in the indoor heat exchanger 2. The first indoor flow path 21, the outdoor heat exchanger 3 and the first compressor 1 are connected in series. A first plate flow path 41 and a second plate flow path 42 are formed in the plate heat exchanger 4. The first plate flow path 41 is connected in series with the geothermal system 412, and the oil-free compressor 421 is connected in series with the second indoor flow path 22. The second plate flow path 42 is suitable for being selectively connected in series between the first indoor flow path 21 and the outdoor heat exchanger 3, or selectively connected in series between the oil-free compressor 421 and the second indoor flow path 22.

Among them, heat pump is a kind of new energy, which can realize the function of transporting low-temperature thermal energy to high-temperature thermal energy, so that heat pump can make full use of the heat in natural resources and waste heat resources. The driving energy of heat pump includes fuel energy and electrical energy, thermal energy and mechanical energy, which can effectively save the primary energy required for civil and industrial use and improve energy saving and environmental protection.

Specifically, the heat pump system 100 is provided with a first compressor 1, which can be set as a centrifugal flotation compressor. The first compressor 1 can be fed with low-temperature and low-pressure refrigerant gas, and the motor inside it drives the piston to compress the refrigerant gas, and then discharges the high-temperature and high-pressure refrigerant gas to provide power to each flow path. The heat pump system 100 is also provided with an indoor heat exchanger 2 and an outdoor heat exchanger 3. The indoor heat exchanger 2 can be connected to the building water circulation system 23 and can be used for heat exchange with the building water circulation system 23. A working fluid flows in the building water circulation system 23, and the building water circulation system 23 is connected to the building. The building water circulation system 23 can be connected to the indoor heat exchanger 23 through the indoor heat exchanger 23. The outdoor heat exchanger 2 exchanges heat to cool or heat the building, such as cooling the air conditioner in the building, or heating the heater in the building to meet the needs of users. A water pump 98 and a switch 97 are provided in the building water circulation system 23. The water pump 98 can make the heat exchange medium flow in the building water circulation system 23 to evenly supply heat to the room, and the switch 97 can be set as a water flow switch to control the circulation of the medium in the building water circulation system 23 to meet different usage requirements. The outdoor heat exchanger 3 can exchange heat with the refrigerant to absorb or release heat to the refrigerant, and the outdoor heat exchanger 3 is provided with a fan 31, which can cool the outdoor heat exchanger 3 to ensure the operational reliability of the outdoor heat exchanger 3.

Furthermore, a first indoor flow path 21 and a second indoor flow path 22 are formed in the indoor heat exchanger 2. The first indoor flow path 21, the outdoor heat exchanger 3 and the first compressor 1 are arranged in series. When the indoor heat exchanger 2 supplies heat to the building water circulation system 23, the outlet end of the first compressor 1 is connected with the first indoor flow path 21 to supply heat to the building water circulation system 23 through the first indoor flow path 21, and the refrigerant after heat exchange absorbs heat through the outdoor heat exchanger 3 and then flows to the inlet end of the first compressor 1. When the indoor heat exchanger 2 cools the building water circulation system 23, the outlet end of the first compressor 1 is connected with the outdoor heat exchanger 3. After the refrigerant flows to the outdoor heat exchanger 3, it can release heat to the outdoor heat exchanger 3 and then flow to the first indoor flow path 21 to cool the building water circulation system 23 through the first indoor flow path 21, and the refrigerant after heat exchange can flow to the inlet end of the first compressor 1.

In addition, the heat pump system 100 is provided with a plate heat exchanger 4 and an oil-free compressor 421. The plate heat exchanger 4 has a first plate exchange path 41 and a second plate exchange path 42. The first plate exchange path 41 is connected in series with the geothermal system 412. The geothermal system 412 is used to evenly heat the entire ground through the heat medium in the floor radiation layer. The heat storage of the ground itself and the law of heat radiation upward can be used for conduction from bottom to top, so as to provide heating. The first plate exchange path 41 is connected in series with the geothermal system 412, so that the heat pump system 100 can use the geothermal system 412. The heat in the geothermal system 412 is used to reduce the energy consumption of the heat pump system 100. A working fluid also circulates in the geothermal system 412, and the working fluid can be the same type as the working fluid in the building water circulation system 23, or a different type of working fluid. A water pump 98, a one-way valve 96, a switch 97 and an electric butterfly valve 411 are also provided in the first plate exchange path 41. The water pump 98 can make the working fluid flow in the first plate exchange path 41 to continuously exchange heat with the geothermal heat exchanger, and the switch 97 can be set as a water flow switch to control the circulation of the working fluid in the first plate exchange path 41 to meet different usage requirements.

Among them, the second plate exchange path 42 is suitable for being selectively connected in series between the first indoor flow path 21 and the outdoor heat exchanger 3, or selectively connected in series between the oil-free compressor 421 and the second indoor flow path 22, that is, the second plate exchange path 42 can be connected in series between the first indoor flow path 21 and the outdoor heat exchanger 3, and can also be connected in series between the oil-free compressor 421 and the second indoor flow path 22. When the second plate exchange path 42 is connected in series between the first indoor flow path 21 and the outdoor heat exchanger 3, the refrigerant after releasing heat in the outdoor heat exchanger 3 can flow to the second plate exchange path 42, and then exchange heat with the first plate exchange path 41 through the second plate exchange path 42 to release heat to the geothermal system 412, and the refrigerant after heat exchange can pass through the first indoor flow path 21 and the building water circulation system 23 to cool the indoor room.

At the same time, the oil-free compressor 421 is connected in series with the second indoor flow path 22, that is, the oil-free compressor 421 can convert the working medium into high-temperature and high-pressure gas and then exchange heat with the building water circulation system 23 through the second indoor flow path 22 to provide heat to the indoor room. When the second plate exchange path 42 is connected in series between the oil-free compressor 421 and the second indoor flow path 22, the working medium in the second indoor flow path 22 after heat exchange with the building water circulation system 23 can flow to the second plate exchange path 42, and then exchange heat with the first plate exchange path 41 through the second plate exchange path 42 to release heat to the geothermal system 412. The working medium after heat exchange can return to the oil-free compressor 421 through the second indoor flow path 22 for compression, so that the oil-free compressor 421 can act on the second indoor flow path 22 alone, thereby reducing the load of the first compressor 1 and extending the service life of the first compressor 1. The first compressor 1 or the oil-free compressor 421 can both supply heat to the indoor heat exchanger 2 to ensure the indoor heat supply, thereby ensuring the indoor comfort.

According to the heat pump system 100 of the embodiment of the present invention, an oil-free compressor 421 is provided, which can act on the second indoor flow path 22, thereby reducing the load of the first compressor 1 and extending the service life of the first compressor 1, and can be selectively connected with the first indoor flow path 21 and the second indoor flow path 22 through the second plate exchange path 42, so that the first compressor 1 or the oil-free compressor 421 can both supply heat to the indoor heat exchanger 2 to ensure the indoor heating amount, thereby ensuring the indoor comfort, with better use effect and wider application range.

In some embodiments, the heat pump system 100 further includes a connecting branch 5 , which is connected in parallel with the second plate exchange path 42 , and one of the connecting branch 5 and the second plate exchange path 42 is selectively connected between the first indoor flow path 21 and the outdoor heat exchanger 3 .

Specifically, as shown in Figure 1, the heat pump system 100 also includes a connecting branch 5, which can be connected between the first indoor flow path 21 and the outdoor heat exchanger 3, that is, after the refrigerant in the first compressor 1 exchanges heat through the first indoor flow path 21 and the building water circulation system 23, it can flow to the outdoor heat exchanger 3 through the connecting branch 5 for heat exchange, and then flow back to the first compressor 1, and the connecting branch 5 and the second plate exchange path 42 are arranged in parallel, that is, the refrigerant between the first indoor flow path 21 and the outdoor heat exchanger 3 can flow through the connecting branch 5, and can also flow through the second plate exchange path 42.

Furthermore, one of the connecting branch 5 and the second plate exchange path 42 is selectively connected between the first indoor flow path 21 and the outdoor heat exchanger 3. When the outlet end of the first compressor 1 is connected to the first indoor flow path 21, the refrigerant exchanges heat through the first indoor flow path 21, and then flows back to the first compressor 1 after heat exchange through the outdoor heat exchanger 3, thereby realizing indoor heating. At this time, the oil-free compressor 421 can also exchange heat with the building water circulation system 23 through the second indoor flow path 22 to ensure the reliability of heating, and when the outlet end of the first compressor 1 is connected to the outdoor heat exchanger 3, the refrigerant can flow to the second plate exchange path 42 after heat exchange through the outdoor heat exchanger 3, and exchange heat through the second plate exchange path 42 and the first plate exchange path 41 to release heat to the geothermal system 412, and the refrigerant can continue to exchange heat with the building water circulation system 23 through the first indoor flow path 21 to cool the indoor room to meet different usage requirements.

In some embodiments, the heat pump system 100 also includes a first three-way valve 6 and a second three-way valve 7. The first three-way valve 6 is provided with a first three-way first valve port 61, a first three-way second valve port 62 and a first three-way third valve port 63. The first three-way first valve port 61 is connected to the outdoor heat exchanger 3, the first three-way second valve port 62 is connected to one end of the connecting branch 5, the first three-way third valve port 63 is connected to the second plate exchange path 42, and the first three-way second valve port 62 and the first three-way third valve port 63 are both arranged to be selectively connected to the first three-way first valve port 61.

Specifically, as shown in FIG. 1 , the first three-way valve 6 is arranged between the outdoor heat exchanger 3 and the connecting branch 5 and the second plate exchange path 42, and as shown in FIG. 3 , the first three-way valve 6 is provided with a first three-way first valve port 61, a first three-way second valve port 62 and a first three-way third valve port 63, the first three-way first valve port 61 can be communicated with the outdoor heat exchanger 3, the first three-way second valve port 62 can be communicated with one end of the connecting branch 5, and the first three-way third valve port 63 can be communicated with the second plate exchange path 42, that is, the refrigerant in the connecting branch 5 can flow to the first three-way second valve port 62 The first valve port 61 can then flow to the outdoor heat exchanger 3 through the first three-way first valve port 61, and the refrigerant after heat exchange in the outdoor heat exchanger 3 can flow to the first three-way third valve port 63 through the first three-way first valve port 61, and then flow to the second plate exchange path 42 through the first three-way third valve port 63, so that the first three-way second valve port 62 and the first three-way third valve port 63 are both configured to be selectively connected to the first three-way first valve port 61, so that when the heat pump system 100 realizes indoor heating or cooling, the refrigerant can flow through different flow paths to ensure the operating reliability of each component.

The second three-way valve 7 is provided with a second three-way first valve port 71, a second three-way second valve port 72 and a second three-way third valve port 73. The second three-way first valve port 71 is connected to the second plate exchange path 42, the second three-way second valve port 72 is connected to the first indoor flow path 21, the second three-way third valve port 73 is connected to the second indoor flow path 22, and the second three-way second valve port 72 and the second three-way third valve port 73 are both arranged to be selectively connected to the second three-way first valve port 71.

Furthermore, the second three-way valve 7 is arranged between the second plate exchange path 42 and the first indoor flow path 21 and the second indoor flow path 22. As shown in FIG. 4, the second three-way valve 7 is provided with a second three-way first valve port 71, a second three-way second valve port 72 and a second three-way third valve port 73. The second three-way first valve port 71 can be communicated with the second plate exchange path 42, the second three-way second valve port 72 can be communicated with the first indoor flow path 21, and the second three-way third valve port 73 can be communicated with the second indoor flow path 22, that is, the refrigerant in the second plate exchange path 42 can flow to the second three-way first valve port 71 through the second three-way first valve port 72. The second valve port 72 is connected, and then can flow to the first indoor flow path 21 through the second three-way second valve port 72, and the refrigerant in the second plate exchange path 42 can also flow to the second three-way third valve port 73 through the second three-way first valve port 71, and then flow to the second indoor flow path 22 through the second three-way third valve port 73, so that the second three-way second valve port 72 and the second three-way third valve port 73 can both be set to be selectively connected with the second three-way first valve port 71, so that when the heat pump system 100 realizes indoor heating or cooling, the refrigerant can flow through different flow paths to ensure the reliability of operation of each component.

In some embodiments, the heat pump system 100 further includes a cooling flow path, which is used to pass part of the refrigerant flowing out of the first compressor 1 into the space where the motor of the first compressor 1 is located and/or the space where the bearing of the first compressor 1 is located.

Specifically, as shown in Figure 1, the heat pump system 100 is also provided with a cooling flow path, in which structures such as a throttle valve 94 and a filter 92 are provided. Part of the refrigerant flowing out of the first compressor 1 can flow into the cooling flow path, and part of the refrigerant flowing through the outdoor heat exchanger 3 can also flow into the cooling flow path. After the refrigerant is converted into a low-temperature and low-pressure gas through the throttle valve 94, it can be filtered out of impurities through the filter 92.

Furthermore, the other end of the cooling flow path can be connected to the space where the motor of the first compressor 1 is located and/or the space where the bearing of the first compressor 1 is located, that is, the other end of the cooling flow path can be connected only to the space where the motor of the first compressor 1 is located, or can be connected only to the space where the bearing of the first compressor 1 is located, or can be connected to both the space where the motor of the first compressor 1 and the space where the bearing of the first compressor 1 are located. In this embodiment, as shown in Figure 1, the other end of the cooling flow path is connected to both the space where the motor of the first compressor 1 is located and the space where the bearing of the first compressor 1 is located, so that the filtered low-temperature and low-pressure gas refrigerant can cool the motor and the bearing, avoid overheating of the first compressor 1, ensure the operating stability of the first compressor 1, and extend the service life of the first compressor 1.

In some embodiments, the cooling flow path includes a first cooling branch 81 and/or a second cooling branch 82, wherein the inlet end of the first cooling branch 81 is connected between the outdoor heat exchanger 3 and the first compressor 1 or between the first indoor flow path 21 and the first compressor 1, and the outlet end of the first cooling branch 81 is connected to the space where the bearing of the first compressor 1 is located, and the inlet end of the second cooling branch 82 is connected between the outdoor heat exchanger 3 and the second plate exchange path 42 or between the first indoor flow path 21 and the second plate exchange path 42, and the outlet end of the second cooling branch 82 is connected to the space where the motor of the first compressor 1 is located.

Specifically, as shown in Figure 1, the cooling flow path is provided with a first cooling branch 81 and/or a second cooling branch 82, that is, the cooling flow path may be provided with only the first cooling branch 81, or may be provided with only the second cooling branch 82, or may be provided with both the first cooling branch 81 and the second cooling branch 82. In the present embodiment, the cooling flow path is provided with both the first cooling branch 81 and the second cooling branch 82.

Furthermore, the inlet end of the first cooling branch 81 is connected between the outdoor heat exchanger 3 and the first compressor 1 or between the first indoor flow path 21 and the first compressor 1. When the inlet end of the first cooling branch 81 is connected between the outdoor heat exchanger 3 and the first compressor 1, the refrigerant at the outlet end of the first compressor 1 flows to the outdoor heat exchanger 3, and can flow into the first cooling branch 81 through the inlet end of the first cooling branch 81 before flowing to the outdoor heat exchanger 3, and the remaining refrigerant continues to flow after heat exchange with the outdoor heat exchanger 3. When the inlet end of the first cooling branch 81 is connected between the first indoor flow path 21 and the first compressor 1, the refrigerant at the outlet end of the first compressor 1 flows to the first indoor flow path 21, and can flow into the first cooling branch 81 through the inlet end of the first cooling branch 81 before flowing to the first indoor flow path 21, and the remaining refrigerant continues to flow after heat exchange with the building water circulation system 23 through the first indoor flow path 21.

The outlet end of the first cooling branch 81 is connected to the space where the bearing of the first compressor 1 is located, that is, the refrigerant flowing through the first cooling branch 81 can flow to the space where the bearing of the first compressor 1 is located, thereby cooling the bearing and ensuring the operating reliability of the bearing.

At the same time, the inlet end of the second cooling branch 82 is connected to the outdoor heat exchanger 3 and the second plate exchange path 42 or to the first indoor flow path 21 and the first compressor 1. When the inlet end of the second cooling branch 82 is connected to the outdoor heat exchanger 3 and the second plate exchange path 42, the refrigerant at the outlet end of the first compressor 1 flows to the outdoor heat exchanger 3, and after heat exchange in the outdoor heat exchanger 3, it can flow into the second cooling branch 82 through the inlet end of the second cooling branch 82, and the remaining refrigerant continues to flow to the second plate exchange path 42 for heat exchange. When the inlet end of the second cooling branch 82 is connected to the first indoor flow path 21 and the first compressor 1, the refrigerant at the outlet end of the first compressor 1 flows to the first indoor flow path 21, and before flowing to the first indoor flow path 21, it can flow into the second cooling branch 82 through the inlet end of the second cooling branch 82, and the remaining refrigerant continues to flow after heat exchange with the building water circulation system 23 through the first indoor flow path 21.

And the outlet end of the second cooling branch 82 is connected to the space where the motor of the first compressor 1 is located, that is, the refrigerant flowing through the second cooling branch 82 can flow to the space where the motor of the first compressor 1 is located, thereby cooling the motor and ensuring the reliability of the motor operation.

In some embodiments, a first gas-liquid separator 811 is provided in the first cooling branch 81, and an intermediate flow path 83 is connected between the upstream of the first gas-liquid separator 811 and the second cooling branch 82 in the first cooling branch 81, and the refrigerant in the first cooling branch 81 is suitable for flowing into the second cooling branch 82 through the intermediate flow path 83.

Specifically, the inlet end of the first cooling branch 81 is connected to the outdoor heat exchanger 3 and the first compressor 1 or to the first indoor flow path 21 and the first compressor 1, and the outlet end is connected to the space where the bearing of the first compressor 1 is located, so that the bearing of the first compressor 1 can be cooled and cooled through the first cooling branch 81 to ensure the operating reliability of the first compressor 1. As shown in Figure 1, a first gas-liquid separator 811 is provided in the first cooling branch 81, and a throttle valve 94 is provided downstream of the first gas-liquid separator 811. The first gas-liquid separator 811 can separate the refrigerant into gas and liquid, thereby ensuring that the refrigerant flowing through the first cooling branch 81 to the space where the bearing of the first compressor 1 is located is in a gaseous state. After the refrigerant is converted into a low-temperature and low-pressure gas through the throttle valve 94, the bearing can be cooled after being filtered by the filter 92, thereby ensuring the cooling reliability and the operating stability of the bearing.

Further, as shown in FIG. 1 , the first cooling branch 81 is connected with an intermediate flow path 83 between the upstream of the first gas-liquid separator 811 and the second cooling branch 82, and the refrigerant in the first cooling branch 81 is suitable for flowing to the second cooling branch 82 through the intermediate flow path 83, that is, before the refrigerant in the first cooling branch 81 flows to the first gas-liquid separator 811, part of it can flow to the intermediate flow path 83, and the second cooling branch 82 is connected to the intermediate flow path 83, so that the refrigerant in the intermediate flow path 83 can flow to the refrigerant in the second cooling branch 82. After the refrigerant is mixed, it flows into the space where the motor of the first compressor 1 is located. A throttle valve 94 is provided in the intermediate flow path 83. The refrigerant in the intermediate flow path 83 becomes a low-temperature, low-pressure, superheated gas after passing through the throttle valve 94. A throttle valve 94 is also provided in the second cooling branch 82. The refrigerant in the second cooling branch 82 becomes a low-temperature, low-pressure two-phase state after passing through the throttle valve 94. The low-temperature, low-pressure gas, the superheated gas, and the low-temperature, low-pressure liquid are heat-exchanged and then filtered through the filter 92. After filtering, the motor is cooled to ensure cooling reliability and motor operation stability.

In some embodiments, a second gas-liquid separator 841 is also provided at the inlet end of the first compressor 1, and the second gas-liquid separator 841 is connected to a return flow path 84, and the refrigerant after cooling the bearings in the space where the bearings are located and the refrigerant after cooling the motor in the space where the motor is located are suitable for flowing from the return flow path 84 to the second gas-liquid separator 841.

Specifically, as shown in FIG1 , a second gas-liquid separator 841 is further provided at the inlet end of the first compressor 1, and the second gas-liquid separator 841 can separate the gas and liquid of the refrigerant flowing into the first compressor 1 to ensure the operating reliability of the first compressor 1, and the second gas-liquid separator 841 is connected to the return flow path 84, that is, the outlet end of the return flow path 84 is connected to the second gas-liquid separator 841, so that the refrigerant in the return flow path 84 can be separated into gas and liquid by the second gas-liquid separator 841 and then circulated into the first compressor 1, and the refrigerant circulates to the first compressor 1 through the first cooling branch 81. After cooling the bearing in the space where the bearing is located, the refrigerant can enter the return flow path 84 through the inlet end of the return flow path 84, and the refrigerant flows through the second cooling branch 82 to the space where the motor of the first compressor 1 is located to cool the motor, and then can enter the return flow path 84 through the inlet end of the return flow path 84, and then can flow through the return flow path 84 to the second gas-liquid separator 841 for gas-liquid separation, ensuring that the refrigerant flowing into the first compressor 1 is gas, thereby ensuring the operating reliability of the first compressor 1, and the refrigerant can be recycled to save the installation cost.

Furthermore, when the heat pump system 100 is in the defrost mode, the outlet end of the first compressor 1 is connected to the outdoor heat exchanger 3, so that the refrigerant can flow to the outdoor heat exchanger 3, the refrigerant can exchange heat with the outdoor heat exchanger 3, and then the outdoor heat exchanger 3 can be defrosted, and the refrigerant after heat exchange can flow to the space where the motor of the first compressor 1 is located through the second cooling branch 82 to cool the motor. The refrigerant after cooling the motor flows through the return flow path 84 to the second gas-liquid separator 841 for gas-liquid separation and then flows back to the first compressor 1 for compression. At this time, the outlet end of the oil-free compressor 421 is connected to the second indoor flow path 22, so that the refrigerant can supply heat to the room through the second indoor flow path 22, so that while the outdoor heat exchanger 3 is defrosted, the indoor heating can also be guaranteed to ensure the indoor comfort. The second indoor flow path 22 is also provided with a throttle valve 94 and a stop valve 95, etc.

Among them, a drainage branch 99 is also provided between the first plate exchange path 41 and the geothermal system 412. The drainage branch 99 is provided with a drainage valve 991. The drainage valve 991 can be set as a centrifugal refrigeration drainage valve, which can discharge the medium flowing in the first plate exchange path 41 and the geothermal system 412, thereby avoiding freezing of the plate heat exchanger 4 under low temperature conditions, ensuring the reliability of the plate heat exchanger 4, and extending the service life of the plate heat exchanger 4.

In some embodiments, the heat pump system 100 also includes a four-way valve 93, which is used to connect the first compressor 1, the first indoor flow path 21 and the outdoor heat exchanger 3 in sequence along the refrigerant flow direction, or to connect the first compressor 1, the outdoor heat exchanger 3 and the first indoor flow path 21 in sequence along the refrigerant flow direction.

Specifically, as shown in Figure 1, the heat pump system 100 is also provided with a four-way valve 93, which is arranged between the first compressor 1 and the outdoor heat exchanger 3 and the indoor heat exchanger 2, so that the four-way valve 93 can connect the first compressor 1, the first indoor flow path 21 and the outdoor heat exchanger 3 in sequence along the refrigerant flow direction, or connect the first compressor 1, the outdoor heat exchanger 3 and the first indoor flow path 21 in sequence along the refrigerant flow direction. When the heat pump system 100 supplies heat to the indoor room, the four-way valve 93 can connect the first compressor 1, the first indoor flow path 21 and the outdoor heat exchanger 3 in sequence along the refrigerant flow direction. When the heat pump system 100 cools the indoor room, the four-way valve 93 can connect the first compressor 1, the outdoor heat exchanger 3 and the first indoor flow path 21 in sequence along the refrigerant flow direction to meet different needs, simplify the setting of pipelines, save setting costs, facilitate later maintenance, and improve the integration of the heat pump system 100.

Further, as shown in Figure 2, the four-way valve 93 is provided with a four-way first valve port 931, a four-way second valve port 932, a four-way third valve port 933 and a four-way fourth valve port 934, the outlet end of the first compressor 1 is connected to the four-way fourth valve port 934, the inlet end of the first compressor 1 is connected to the four-way second valve port 932, the outdoor heat exchanger 3 is connected to the four-way first valve port 931, and the first indoor flow path 21 is connected to the four-way third valve port 933, that is, when the heat pump system 100 supplies heat to the indoor room, the refrigerant flows to the four-way third valve port 933 through the four-way fourth valve port 934, and then flows to the first indoor flow path 21, and after heat exchange, flows to the outdoor heat exchanger 3 for heat exchange, and then flows to the four-way second valve port 932 through the four-way first valve port 931 to flow back to the first compressor 1.

When the heat pump system 100 cools the indoor space, the refrigerant flows through the four-way fourth valve port 934 to the four-way first valve port 931, and then flows to the outdoor heat exchanger 3, and after heat exchange with the outdoor heat exchanger 3, flows to the plate heat exchanger 4 for heat exchange, and then flows to the first indoor flow path 21 for heat exchange, and then flows to the four-way second valve port 932 through the four-way third valve port 933 to flow back to the first compressor 1, and when the heat pump system 100 defrosts, the refrigerant flows through the four-way fourth valve port 934 to the four-way first valve port 931, and then flows to the outdoor heat exchanger 3, and after heat exchange with the outdoor heat exchanger 3, flows to the space where the motor of the first compressor 1 is located through the second cooling branch 82, and then flows to the inlet end of the first compressor 1 through the return flow path 84.

In some embodiments, a liquid storage tank 211 and an expansion valve 212 are further provided between the first indoor flow path 21 and the outdoor heat exchanger 3 .

Specifically, as shown in Figure 1, a liquid storage tank 211 and an expansion valve 212 are also provided between the first indoor flow path 21 and the outdoor heat exchanger 3. The expansion valve 212 is set as a VPF50 expansion valve. The refrigerant flows from the outlet end of the first compressor 1 to the four-way valve 93, and then flows to the first indoor flow path 21 through the four-way valve 93. Heat is exchanged with the building water circulation system 23 through the first indoor flow path 21 to provide indoor heating. The refrigerant after heat exchange can flow to the expansion valve 212. The refrigerant after passing through the expansion valve 212 can be filtered by the filter 92, and then flows to the connecting branch 5. The other end of the connecting branch 5 is connected to the first three-way valve 6. The refrigerant flows to the liquid storage tank 211 through the first three-way valve 6 for gas-liquid separation, so that the liquid is retained in the liquid storage tank 211, and the remaining refrigerant flows to the outdoor heat exchanger 3 and then flows back to the first compressor 1.

Furthermore, when the heat pump system 100 is cooling, the refrigerant flows from the outlet end of the first compressor 1 to the four-way valve 93, and then flows to the outdoor heat exchanger 3 through the four-way valve 93. After passing through the outdoor heat exchanger 3, the gas-liquid separation is carried out through the liquid storage tank 211, and the refrigerant after gas-liquid separation flows through the first three-way valve 6 to the second plate exchange path 42, and then flows to the second three-way valve 7, so as to flow to the expansion valve 212 through the second three-way valve 7, and after passing through the expansion valve 212, it can flow to the first indoor flow path 21 and the building water circulation system 23 for heat exchange to cool the indoor room, and the refrigerant after heat exchange can continue to flow to return to the first compressor 1.

In addition, the heat pump system 100 is also provided with a plurality of sight glasses 91, one-way valves 96 and stop valves 95. The sight glass 91 can monitor the amount of refrigerant in each flow path in real time and replenish the refrigerant to the flow path in time to ensure the operational reliability of the heat pump system 100. The one-way valve 96 and the stop valve 95 can ensure the operational reliability of each flow path so that the refrigerant flows as needed. A manual butterfly valve 11 and a switch 97 are also provided before and after the first compressor 1. The manual butterfly valve 11 can manually control the on and off of the flow path of the first compressor 1 to improve the flexibility of use. The switch 97 can be set to a low-pressure switch or a high-pressure switch to ensure the operational stability of the heat pump system 100.

In some embodiments, a third gas-liquid separator 221 is further provided at the inlet end of the oil-free compressor 421 , and the third gas-liquid separator 221 is connected between the second indoor flow path 22 and the oil-free compressor 421 .

Specifically, as shown in FIG1 , the heat pump system 100 is provided with an oil-free compressor 421, and the oil-free compressor 421 is connected in series with the second indoor flow path 22, that is, the oil-free compressor 421 can convert the working medium into a high-temperature and high-pressure gas and then exchange heat with the building water circulation system 23 through the second indoor flow path 22 to provide heat to the indoor space, and when the second plate exchange path 42 is connected in series between the oil-free compressor 421 and the second indoor flow path 22, the working medium in the second indoor flow path 22 after heat exchange with the building water circulation system 23 can flow to the second plate exchange path 42, and then exchange heat with the first plate exchange path 41 through the second plate exchange path 42 to release heat to the geothermal system 412. A third gas-liquid separator 221 is also provided at the inlet end of the oil-free compressor 421, that is, the refrigerant after heat exchange with the building water circulation system 23 in the second indoor flow path 22 can be separated into gas and liquid through the third gas-liquid separator 221, so that the refrigerant entering the oil-free compressor 421 is pure gas, thereby ensuring the operational reliability of the oil-free compressor 421, and the oil-free compressor 421 can act on the second indoor flow path 22 alone, thereby reducing the load of the first compressor 1 and extending the service life of the first compressor 1, and the first compressor 1 or the oil-free compressor 421 can both supply heat to the indoor heat exchanger 2 to ensure the indoor heating supply, thereby ensuring the indoor comfort.

In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims (10)

1. A heat pump system, comprising: A first compressor, an indoor heat exchanger and an outdoor heat exchanger, wherein a first indoor flow path and a second indoor flow path are formed in the indoor heat exchanger, and the first indoor flow path, the outdoor heat exchanger and the first compressor are arranged in series; A plate heat exchanger and an oil-free compressor, wherein a first plate exchange path and a second plate exchange path are formed in the plate heat exchanger, the first plate exchange path is connected in series with the geothermal system, and the oil-free compressor is connected in series with the second indoor flow path; The second plate flow path is suitable for being selectively connected in series between the first indoor flow path and the outdoor heat exchanger, or selectively connected in series between the oil-free compressor and the second indoor flow path. 2. The heat pump system according to claim 1 is characterized in that it also includes a connecting branch, which is connected in parallel with the second plate exchanger path, and one of the connecting branch and the second plate exchanger path is selectively connected between the first indoor flow path and the outdoor heat exchanger. 3. The heat pump system according to claim 2, further comprising: a first three-way valve, wherein the first three-way valve is provided with a first three-way first valve port, a first three-way second valve port and a first three-way third valve port, wherein the first three-way first valve port is communicated with the outdoor heat exchanger, the first three-way second valve port is communicated with one end of the connecting branch, the first three-way third valve port is communicated with the second plate exchange path, and the first three-way second valve port and the first three-way third valve port are both arranged to selectively communicate with the first three-way first valve port; A second three-way valve, the second three-way valve is provided with a second three-way first valve port, a second three-way second valve port and a second three-way third valve port, the second three-way first valve port is connected with the second plate exchange flow path, the second three-way second valve port is connected with the first indoor flow path, the second three-way third valve port is connected with the second indoor flow path, the second three-way second valve port and the second three-way third valve port are both arranged to selectively connect with the second three-way first valve port. 4. The heat pump system according to claim 1 is characterized in that it also includes a cooling flow path, which is used to pass part of the refrigerant flowing out of the first compressor into the space where the motor of the first compressor is located and/or the space where the bearing of the first compressor is located. 5. The heat pump system according to claim 4, characterized in that the cooling flow path includes a first cooling branch and/or a second cooling branch; Among them, the inlet end of the first cooling branch is connected between the outdoor heat exchanger and the first compressor or between the first indoor flow path and the first compressor, and the outlet end of the first cooling branch is connected to the space where the bearing of the first compressor is located, the inlet end of the second cooling branch is connected between the outdoor heat exchanger and the second plate exchange path or between the first indoor flow path and the first compressor, and the outlet end of the second cooling branch is connected to the space where the motor of the first compressor is located. 6. The heat pump system according to claim 5 is characterized in that a first gas-liquid separator is provided in the first cooling branch, an intermediate flow path is connected between the first cooling branch upstream of the first gas-liquid separator and the second cooling branch, and the refrigerant in the first cooling branch is suitable for flowing into the second cooling branch through the intermediate flow path. 7. The heat pump system according to claim 6 is characterized in that a second gas-liquid separator is also provided at the inlet end of the first compressor, and the second gas-liquid separator is connected to a return flow path, and the refrigerant after cooling the bearing in the space where the bearing is located and the refrigerant after cooling the motor in the space where the motor is located are suitable for flowing from the return flow path to the second gas-liquid separator. 8. The heat pump system according to claim 1 is characterized in that it also includes a four-way valve, which is used to connect the first compressor, the first indoor flow path and the outdoor heat exchanger in sequence along the refrigerant flow direction or to connect the first compressor, the outdoor heat exchanger and the first indoor flow path in sequence along the refrigerant flow direction. 9 . The heat pump system according to claim 1 , wherein a liquid storage tank and an expansion valve are further provided between the first indoor flow path and the outdoor heat exchanger. 10. The heat pump system according to claim 1, characterized in that a third gas-liquid separator is further provided at the inlet end of the oil-free compressor, and the third gas-liquid separator is connected between the second indoor flow path and the oil-free compressor.