Heat pump system

Abstract

The utility model discloses a heat pump system which comprises a compressor, a first heat exchanger, a second heat exchanger, a first throttling set and a second throttling set. Through the arrangement of the second heating loop and the second refrigerating loop, the gaseous heat exchange medium flows back into the compressor medium-pressure cavity, the system operation compression ratio is reduced, then the system circulation flow is increased, the energy efficiency is improved, meanwhile, the system exhaust temperature is reduced, and stable operation of a unit is guaranteed. Two-stage compression is achieved through the air supply enthalpy increasing principle while secondary throttling is achieved, so that the efficiency of the compressor is improved, it is guaranteed that efficient heating and refrigerating capacity is achieved in the environment with the high temperature or the low temperature, and a heat pump system operates stably.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy heating equipment, in particular to a heat pump system. Background Art

[0002] A heat pump is an energy-efficient device that makes full use of low-grade heat energy. It converts low-grade heat sources into high-grade heat sources in the reverse Carnot cycle. By consuming only a small amount of net reverse cycle work, a large heating capacity can be obtained, effectively utilizing low-grade heat energy that is difficult to apply to achieve energy-saving purposes.

[0003] With the gradual market recognition, air-source heating and cooling heat pumps have been widely promoted unprecedentedly and are widely used in the south and some northern regions. However, when the heat pump is applied to areas with relatively low ambient temperatures, the heating effect is poor and the heating effect cannot be achieved. In areas with relatively high ambient temperatures, the refrigeration effect of the heat pump is poor and refrigeration under high-temperature environments cannot be achieved. Summary of the Utility Model

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the defect that when the existing heat pump is applied to environments with relatively high or low temperatures, the heating and / or refrigeration effects are poor and stable operation cannot be achieved, so as to provide a heat pump system.

[0005] To solve the above technical problems, the technical solution of the utility model is as follows:

[0006] A heat pump system includes: a compressor, a first heat exchanger, a second heat exchanger, a first throttling group, and a second throttling group; a vaporization device is arranged between the first heat exchanger and the second heat exchanger to be suitable for gas-liquid separation of the heat exchange medium; the first throttling group is arranged between the first heat exchanger and the vaporization device, and the second throttling group is arranged between the vaporization device and the second heat exchanger; in the heating mode: the heat exchange medium flows out of the compressor, successively flows through the first heat exchanger, the first throttling group, the vaporization device, the second throttling group, and the second heat exchanger, and then returns to the compressor to form a first heating circuit, and successively flows through the first heat exchanger, the first throttling group, and the vaporization device, and then returns to the compressor to form a second heating circuit; in the refrigeration mode: the heat exchange medium flows out of the compressor, flows through the second heat exchanger, the second throttling group, the vaporization device, the first throttling group, and the first heat exchanger, and then returns to the compressor to form a first refrigeration circuit, and flows through the second heat exchanger, the second throttling group, and the vaporization device, and then returns to the compressor to form a second refrigeration circuit.

[0007] According to some embodiments of the present utility model, the vaporization device includes a first port, a second port, and a third port. The first port is provided on the side wall of the vaporization device, the second port is provided at the bottom of the vaporization device, and the third port is provided at the top of the vaporization device. The first port is communicated with the first throttling group, the second port is communicated with the second throttling group, and the third port is communicated with the compressor.

[0008] According to some embodiments of the present utility model, after the heat exchange medium passes through the first throttling group and enters the vaporization device from the first port, the heat exchange medium forms saturated gas and saturated liquid in the vaporization device. The saturated gas heat exchange medium flows back into the compressor through the third port to form a first heating circuit, and the saturated liquid heat exchange medium flows out through the second port, passes through the second throttling group and the second heat exchanger, and then flows back into the compressor to form a second heating circuit;

[0009] After the heat exchange medium passes through the second heat exchanger and the second throttling group and enters the vaporization device from the second port, the heat exchange medium forms saturated gas and saturated liquid in the vaporization device. The saturated gas heat exchange medium flows back into the compressor through the third port to form a first refrigeration circuit, and the saturated liquid heat exchange medium flows through the first throttling group and the first heat exchanger through the second port and then flows back into the compressor to form a second refrigeration circuit.

[0010] According to some embodiments of the present utility model, the heat pump system further includes a reversing valve body. The reversing valve body includes a first valve port, a second valve port, a third valve port, and a fourth valve port. The first valve port is communicated with the discharge port of the compressor, the second valve port is communicated with the first heat exchanger, the third valve port is communicated with the first return port of the compressor, and the fourth valve port is communicated with the second heat exchanger;

[0011] In the heating mode, the first valve port is communicated with the second valve port, and the third valve port is communicated with the fourth valve port; in the refrigeration mode, the first valve port is communicated with the fourth valve port, and the second valve port is communicated with the third valve port.

[0012] According to some embodiments of the present utility model, the heat pump system further includes a controller, and the controller is communicatively connected with the reversing valve body to be adapted to drive the reversing valve body to reverse.

[0013] According to some embodiments of the present utility model, the first throttling group includes a first expansion valve and a check valve arranged in parallel. The check valve is connected to the port of the first expansion valve close to the first heat exchanger through a capillary tube, and the valve direction of the check valve is set in the direction from the second heat exchanger to the first heat exchanger;

[0014] According to some embodiments of the present utility model, the second throttling group includes a second expansion valve and a filter arranged in series, and the filter is located between the second heat exchanger and the second expansion valve.

[0015] According to some embodiments of the present utility model, the heat pump system further includes a fan, the fan is disposed opposite to the second heat exchanger, and in the heating circuit, the fan is in an on state.

[0016] According to some embodiments of the present utility model, the first heat exchanger is a condenser, the second heat exchanger is an evaporator, and one end of the first heat exchanger is connected to an external heat-using device through a water supply pipe.

[0017] According to some embodiments of the present utility model, the first heat exchanger is a plate heat exchanger and / or the second heat exchanger is a finned heat exchanger.

[0018] The technical solution of the present utility model has the following advantages:

[0019] In the heat pump system provided by the present utility model, in the heating mode, after the heat exchange medium passes through the first throttling group for primary throttling, it enters the vaporization device to achieve gas-liquid separation. The liquid heat exchange medium passes through the second throttling group for secondary throttling and then enters the second heat exchanger for heat exchange, and then returns to the compressor to form the first heating circuit. The gaseous heat exchange medium directly returns to the compressor from the vaporization device; in the cooling mode, after the heat exchange medium flows through the second heat exchanger, it undergoes primary throttling in the first throttling group and then enters the vaporization device to achieve gas-liquid separation. The liquid heat exchange medium undergoes secondary throttling in the second throttling group and then enters the first heat exchanger for heat exchange, and then returns to the compressor to form the first cooling circuit. The gaseous heat exchange medium directly returns to the compressor from the vaporization device to form the second cooling circuit. Through the setting of the second heating circuit and the second cooling circuit, the gaseous heat exchange medium returns to the intermediate pressure chamber of the compressor, reducing the system operation compression ratio, thereby increasing the system circulation flow rate, improving the energy efficiency, and at the same time reducing the system exhaust temperature to ensure the stable operation of the unit. While achieving secondary throttling, through the principle of gas injection and enthalpy increase, two-stage compression is achieved, thereby improving the efficiency of the compressor to ensure efficient heating and cooling capabilities in environments with relatively high or low temperatures, and enabling the stable operation of the heat pump system. Description of the Drawings

[0020] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0021] Figure 1 Schematic diagram of the heat pump system provided in some embodiments of the present utility model in the heating mode;

[0022] Figure 2 Schematic diagram of the heat pump system provided in some embodiments of the present utility model in the cooling mode;

[0023] Figure 3 Structural schematic diagram of the vaporization device provided in some embodiments of the present utility model;

[0024] Figure 4 Structural schematic diagram of the commutation valve body provided in some embodiments of the present utility model.

[0025] Description of the reference numerals in the drawings: 1. Compressor; 2. First heat exchanger; 3. Second heat exchanger; 4. Vaporization device; 5. First throttling group; 6. Second throttling group; 7. Commutation valve body; 8. Fan; 41. First port; 42. Second port; 43. Third port; 51. First expansion valve; 52. Check valve; 53. Capillary tube; 61. Second expansion valve; 62. Filter; 71. First valve port; 72. Second valve port; 73. Third valve port; 74. Fourth valve port. Detailed implementation manners

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0027] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model 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 of the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "coupling" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0029] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0030] Refer to Figure 1 and Figure 2 As shown, in some embodiments of the present utility model, the arrow indicates the flow direction of the heat exchange medium. In some embodiments of the present utility model, a heat pump system is provided, including: a compressor 1, a first heat exchanger 2, a second heat exchanger 3, a first throttling group 5, and a second throttling group 6; a vaporization device 4 is disposed between the first heat exchanger 2 and the second heat exchanger 3 to be adapted to separate the gas and liquid of the heat exchange medium; the first throttling group 5 is disposed between the first heat exchanger 2 and the vaporization device 4, and the second throttling group 6 is disposed between the vaporization device 4 and the second heat exchanger 3; in the heating mode: the heat exchange medium flows out of the compressor 1, sequentially flows through the first heat exchanger 2, the first throttling group 5, the vaporization device 4, the second throttling group 6, and the second heat exchanger 3, and then returns to the compressor 1 to form a first heating circuit and sequentially flows through the first heat exchanger 2, the first throttling group 5, and the vaporization device 4, and then returns to the compressor 1 to form a second heating circuit; in the cooling mode: the heat exchange medium flows out of the compressor 1, flows through the second heat exchanger 3, the second throttling group 6, the vaporization device 4, the first throttling group 5, and the first heat exchanger 2, and then returns to the compressor 1 to form a first cooling circuit, and flows through the second heat exchanger 3, the second throttling group 6, and the vaporization device 4, and then returns to the compressor 1 to form a second cooling circuit.

[0031] Specifically, in the heating mode, after the heat exchange medium passes through the first throttling group 5 for the first throttling, it enters the vaporization device 4 to achieve gas-liquid separation. The liquid heat exchange medium passes through the second throttling group 6 for the second throttling and then enters the second heat exchanger 3 for heat exchange, and then returns to the compressor 1 to form the first heating circuit. The gaseous heat exchange medium directly returns from the vaporization device 4 to the compressor 1; in the cooling mode, after the heat exchange medium flows through the second heat exchanger 3, it undergoes the first throttling in the first throttling group 5 and then enters the vaporization device 4 to achieve gas-liquid separation. The liquid heat exchange medium undergoes the second throttling in the second throttling group 6 and then enters the first heat exchanger 2 for heat exchange, and then returns to the compressor 1 to form the first cooling circuit. The gaseous heat exchange medium directly returns from the vaporization device 4 to the compressor 1 to form the second cooling circuit. Through the setting of the second heating circuit and the second cooling circuit, the gaseous heat exchange medium returns to the middle pressure cavity of the compressor 1, reducing the system operation compression ratio, thereby increasing the system circulation flow rate, improving the energy efficiency, and at the same time reducing the system exhaust temperature to ensure the stable operation of the unit. While achieving the second throttling, through the principle of gas injection and enthalpy increase, two-stage compression is achieved, thereby improving the efficiency of the compressor 1 to ensure efficient heating and cooling capabilities in environments with relatively high or low temperatures, enabling the heat pump system to operate stably.

[0032] It can be understood that the working principle of gas injection and enthalpy increase is to inhale a part of the gas at the intermediate pressure during the operation of the compressor 1, mix it with the heat exchange medium that has been partially compressed, and then compress it to achieve two-stage compression, thereby improving the efficiency of the compressor 1.

[0033] Referring to Figure 1 、 Figure 2 and Figure 3 As shown, in some embodiments of the present invention, the vaporization device 4 includes a first port 41, a second port 42, and a third port 43. The first port 41 is provided on the side wall of the vaporization device 4, the second port 42 is provided at the bottom of the vaporization device 4, the third port 43 is provided at the top of the vaporization device 4. The first port 41 is communicated with the first throttling group 5, the second port 42 is communicated with the second throttling group 6, and the third port 43 is communicated with the compressor 1.

[0034] Specifically, the vaporization device 4 is a flash evaporator. The heat exchange medium throttled by the first throttling group 5 or the second throttling group 6 flashes in the vaporization device 4 to separate the heat exchange medium into saturated gas state and saturated liquid state. The third port 43 is communicated with the compressor 1. The saturated gaseous heat exchange medium returns to the middle pressure cavity of the compressor 1 through the third port 43, reducing the system operation compression ratio, thereby increasing the system circulation flow rate, improving the energy efficiency, and at the same time reducing the system exhaust temperature to ensure the stable operation of the unit.

[0035] In some embodiments of the present utility model, after the heat exchange medium passes through the first throttling group 5 and enters the vaporization device 4 from the first port 41, the heat exchange medium forms saturated gas and saturated liquid in the vaporization device 4. The heat exchange medium in saturated gas state flows back into the compressor 1 through the third port 43 to form a first heating circuit, and the heat exchange medium in saturated liquid state flows out through the second port 42, passes through the second throttling group 6 and the second heat exchanger 3, and then flows back into the compressor 1 to form a second heating circuit;

[0036] After the heat exchange medium passes through the second heat exchanger 3 and the second throttling group 6 and enters the vaporization device 4 from the second port 42, the heat exchange medium forms saturated gas and saturated liquid in the vaporization device 4. The heat exchange medium in saturated gas state flows back into the compressor 1 through the third port 43 to form a first refrigeration circuit, and the heat exchange medium in saturated liquid state passes through the second port 42, passes through the first throttling group 5 and the first heat exchanger 2, and then flows back into the compressor 1 to form a second refrigeration circuit.

[0037] Refer to Figure 1 、 Figure 2 and Figure 4 As shown in

[0038] In some embodiments of the present utility model, the heat pump system further includes a reversing valve body 7. The reversing valve body 7 includes a first valve port 71, a second valve port 72, a third valve port 73 and a fourth valve port 74. The first valve port 71 is communicated with the discharge port of the compressor 1, the second valve port 72 is communicated with the first heat exchanger 2, the third valve port 73 is communicated with the first return port of the compressor 1, and the fourth valve port 74 is communicated with the second heat exchanger 3;

[0039] In heating mode, the first valve port 71 is communicated with the second valve port 72, and the third valve port 73 is communicated with the fourth valve port 74; in refrigeration mode, the first valve port 71 is communicated with the fourth valve port 74, and the second valve port 72 is communicated with the third valve port 73.

[0040] Specifically, the reversing valve body 7 is an electric four-way reversing valve. By driving the switching of the valve ports of the reversing valve body 7 through a controller, the switching between the refrigeration mode and the heating mode can be realized.

[0041] In some embodiments of the present utility model, the first throttling group 5 includes a first expansion valve 51 and a check valve 52 arranged in parallel. The check valve 52 is connected to the port of the first expansion valve 51 close to the first heat exchanger 2 through a capillary tube 53. The valve direction of the check valve 52 is set in the direction from the second heat exchanger 3 to the first heat exchanger 2.

[0042] In some embodiments of the present utility model, the second throttling group 6 includes a second expansion valve 61 and a filter 62 arranged in series. The filter 62 is located between the second heat exchanger 3 and the second expansion valve 61.

[0043] Specifically, the first expansion valve 51 is used as the primary throttling in the heating mode. To ensure the stable operation of the unit at -35°C below zero, a small-flow electronic expansion valve is adopted. However, in the refrigeration mode, the first expansion valve 51 is used as the secondary throttling. To increase the evaporation temperature of the system and the refrigeration capacity, a check valve 52 is connected in parallel. The check valve 52 is connected to the port of the first expansion valve 51 close to the heat exchanger through a capillary tube 53, and the valve direction of the check valve 52 is set from the second heat exchanger 3 to the first heat exchanger 2 to increase the system flow rate in the refrigeration mode and ensure the stable operation of the system.

[0044] In some embodiments of the present utility model, the heat pump system further includes a fan 8. The fan 8 is arranged opposite to the second heat exchanger 3. In the heating circuit, the fan 8 is in an open state.

[0045] Specifically, in the refrigeration mode, the fan 8 starts to cool the heat exchange medium. In the heating mode, the fan 8 starts to absorb heat from the air for the heat exchange medium and at the same time prevent the second heat exchanger 3 from frosting and improve the defrosting efficiency.

[0046] In some embodiments of the present utility model, the first heat exchanger 2 is a condenser, the second heat exchanger 3 is an evaporator, and one end of the first heat exchanger 2 is connected to an external heat-using device through a water supply pipe.

[0047] In some embodiments of the present utility model, the first heat exchanger 2 is a plate heat exchanger and / or the second heat exchanger 3 is a finned heat exchanger.

[0048] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present utility model.

Claims

1. A heat pump system, characterized in that: include: Compressor (1); A first heat exchanger (2) and a second heat exchanger (3); A vaporizing device (4) is provided between the first heat exchanger (2) and the second heat exchanger (3) and is suitable for gas-liquid separation of the heat exchange medium; a first throttling group (5) and a second throttling group (6), wherein the first throttling group (5) is arranged between the first heat exchanger (2) and the vaporizing device (4), and the second throttling group (6) is arranged between the vaporizing device (4) and the second heat exchanger (3); In the heating mode: the heat exchange medium flows out through the compressor (1), flows through the first heat exchanger (2), the first throttling group (5), the vaporizing device (4), the second throttling group (6) and the second heat exchanger (3) in sequence, and flows back into the compressor (1) to form a first heating circuit; and flows through the first heat exchanger (2), the first throttling group (5) and the vaporizing device (4) in sequence, and flows back into the compressor (1) to form a second heating circuit; In the refrigeration mode: the heat exchange medium flows out through the compressor (1), flows through the second heat exchanger (3), the second throttling group (6), the vaporizer (4), the first throttling group (5) and the first heat exchanger (2), and flows back to the compressor (1) to form a first refrigeration circuit; and flows through the second heat exchanger (3), the second throttling group (6) and the vaporizer (4), and flows back to the compressor (1) to form a second refrigeration circuit.

2. The heat pump system according to claim 1, characterized in that: The vaporizer (4) comprises a first port (41), a second port (42) and a third port (43); the first port (41) is arranged on a side wall of the vaporizer (4); the second port (42) is arranged at the bottom of the vaporizer (4); the third port (43) is arranged at the top of the vaporizer (4); the first port (41) is connected to the first throttling group (5); the second port (42) is connected to the second throttling group (6); and the third port (43) is connected to the compressor (1).

3. The heat pump system according to claim 2, characterized in that: After the heat exchange medium passes through the first throttling group (5) and enters the vaporizing device (4) from the first port (41), the heat exchange medium forms a saturated gas state and a saturated liquid state in the vaporizing device (4), the saturated gas state of the heat exchange medium flows back to the compressor (1) through the third port (43) to form the first heating circuit, and the saturated liquid state of the heat exchange medium flows out through the second port (42), flows through the second throttling group (6) and the second heat exchanger (3), and flows back to the compressor (1) to form the second heating circuit; After the heat exchange medium passes through the second heat exchanger (3) and the second throttling group (6) and enters the vaporizing device (4) from the second port (42), the heat exchange medium forms a saturated gas state and a saturated liquid state in the vaporizing device (4). The saturated gas state of the heat exchange medium flows back to the compressor (1) through the third port (43) to form the first refrigeration circuit. The saturated liquid state of the heat exchange medium flows through the second port (42), the first throttling group (5) and the first heat exchanger (2), and flows back to the compressor (1) to form the second refrigeration circuit.

4. The heat pump system according to claim 1, characterized in that: The reversing valve body (7) further comprises a reversing valve body (7), the reversing valve body (7) comprising a first valve port (71), a second valve port (72), a third valve port (73) and a fourth valve port (74), the first valve port (71) being in communication with a discharge port of the compressor (1), the second valve port (72) being in communication with the first heat exchanger (2), the third valve port (73) being in communication with a first return port of the compressor (1), and the fourth valve port (74) being in communication with the second heat exchanger (3); In the heating mode, the first valve port (71) is connected to the second valve port (72), and the third valve port (73) is connected to the fourth valve port (74); in the cooling mode, the first valve port (71) is connected to the fourth valve port (74), and the second valve port (72) is connected to the third valve port (73).

5. The heat pump system according to claim 4, characterized in that: It also comprises a controller, which is in communication connection with the reversing valve body (7) and is suitable for driving the reversing valve body (7) to perform reversing.

6. The heat pump system according to claim 1, characterized in that: The first throttling group (5) comprises a first expansion valve (51) and a one-way valve (52) arranged in parallel, wherein the one-way valve (52) is connected to a port of the first expansion valve (51) close to the first heat exchanger (2) via a capillary tube (53), and the valve direction of the one-way valve (52) is arranged in the direction of flow from the second heat exchanger (3) to the first heat exchanger (2).

7. The heat pump system according to claim 1, characterized in that: The second throttling group (6) comprises a second expansion valve (61) and a filter (62) which are arranged in series, and the filter (62) is located between the second heat exchanger (3) and the second expansion valve (61).

8. The heat pump system according to claim 1, characterized in that: It also includes a fan (8), which is arranged opposite to the second heat exchanger (3), and in the heating circuit, the fan (8) is in an open state.

9. The heat pump system according to claim 1, characterized in that: The first heat exchanger (2) is a condenser, the second heat exchanger (3) is an evaporator, and one end of the first heat exchanger (2) is connected to an external heat-using device via a water supply pipe.

10. The heat pump system according to claim 9, characterized in that: The first heat exchanger (2) is a plate heat exchanger and / or the second heat exchanger (3) is a fin heat exchanger.

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