Heat pump system and water heater

Abstract

The utility model relates to the technical field of water heaters, and discloses a heat pump system which reduces condensation pressure by adjusting the proportion of a gaseous refrigerant and a liquid refrigerant on the condensation side. According to the mode for adjusting the proportion of the gaseous refrigerant and the liquid refrigerant on the condensation side, the heat pump system comprises a compressor, a condenser, an outdoor heat exchanger, a reversing valve and a throttling element which are communicated to form a refrigerant circulation loop; the outdoor heat exchanger comprises an evaporator and an auxiliary heat exchanger, and under the condition that the water temperature is larger than or equal to the temperature threshold value, the throttling element is controlled to change the opening degree or the reversing valve is controlled to reverse so that the auxiliary heat exchanger can be used as a condenser. In this way, when the water temperature of the fixed-frequency heat pump system is high, the proportion of the gaseous refrigerant and the liquid refrigerant on the condensation side is adjusted, and the condensation pressure of the heat pump system is reduced. The utility model further discloses the water heater.

Description

Technical Field

[0001] The present application relates to the technical field of water heaters, for example, to a heat pump system and a water heater. Background Art

[0002] Currently, heat pump water heaters generally use R32 refrigerant. Due to the characteristics of this refrigerant, at high water temperatures (e.g., above 55°C), the condensing pressure can exceed the system's upper limit (e.g., 4.4 MPa). To address this issue, a common solution in existing technology is to reduce the compressor frequency, thereby reducing the refrigerant circulation volume and thus lowering the condensing pressure. However, this approach cannot be applied to fixed-frequency units.

[0003] In addition, there are also refrigerants such as R22 or R134a. Although high water temperatures can be achieved, the refrigerant has a relatively high GWP (global warming potential). However, there is currently no good solution for this in fixed-frequency R32 systems.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to ordinary technicians in this field. Utility Model Content

[0005] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical elements or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0006] The embodiments of the present disclosure provide a heat pump system and a water heater, so that the fixed-frequency heat pump system can reduce the condensing pressure when the water temperature is high.

[0007] In some embodiments, the heat pump system reduces the condensing pressure by adjusting the ratio of the gaseous refrigerant and the liquid refrigerant on the condensing side; wherein, the ratio of the gaseous refrigerant and the liquid refrigerant on the condensing side is adjusted as follows: the heat pump system includes: a compressor, a condenser, an outdoor heat exchanger, a reversing valve and a throttling element connected to form a refrigerant circulation loop; the outdoor heat exchanger includes: an evaporator and an auxiliary heat exchanger, and when the water temperature is greater than or equal to the temperature threshold, the throttling element is controlled to change the opening or the reversing valve is controlled to reverse, so that the auxiliary heat exchanger is used as a condenser.

[0008] In some embodiments, the heat pump system reduces the condensing pressure by adjusting the ratio of the gaseous refrigerant and the liquid refrigerant on the condensing side; wherein, the ratio of the gaseous refrigerant and the liquid refrigerant on the condensing side is adjusted as follows: the heat pump system includes: a compressor, a condenser, a throttling element and an evaporator connected in sequence to form a refrigerant circulation loop; a liquid storage branch, connected to the refrigerant circulation loop, which can be turned on or off by the refrigerant pressure, so that the liquid storage branch releases or stores refrigerant, thereby changing the refrigerant circulation volume.

[0009] In some embodiments, the heat pump system reduces the condensing pressure by adjusting the ratio of the gaseous refrigerant and the liquid refrigerant on the condensing side; wherein, the ratio of the gaseous refrigerant and the liquid refrigerant on the condensing side is adjusted as follows: the heat pump system includes: a compressor, a condenser, a throttling element and an evaporator connected in sequence to form a refrigerant circulation loop; a refrigerant branch, one end of which is connected between the outlet of the compressor and the inlet of the condenser, and the other end is connected to the high-pressure side or the low-pressure side of the heat pump system; a heat exchange part, which is arranged in the refrigerant branch and is correspondingly arranged with the pipeline connected to the outlet of the evaporator for heat exchange; an on-off valve, which is arranged in the refrigerant branch and can be turned on or off.

[0010] In some embodiments, the water heater comprises a heat pump system as described above.

[0011] The heat pump system and water heater provided by the embodiments of the present disclosure can achieve the following technical effects:

[0012] In the refrigerant circulation loop, by adding an auxiliary heat exchanger located outdoors, changing the position of the reversing valve, adding a liquid storage branch, adding a bypass branch, etc., the ratio of gaseous refrigerant and liquid refrigerant on the condensing side is adjusted when the water temperature of the fixed-frequency heat pump system is high, thereby reducing the condensing pressure of the heat pump system.

[0013] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to ordinary technicians in this field. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] One or more embodiments are exemplarily described by corresponding drawings. These exemplary descriptions and drawings do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation. In addition,

[0015] Figure 1 Schematic diagram of the heat pump system in Example 1 provided by the embodiments of the present disclosure in a high water temperature state;

[0016] Figure 2 is a schematic diagram of the heat pump system of Example 1 provided in the embodiments of the present disclosure in a normal state;

[0017] Figure 3 Schematic diagram of the heat pump system of Example 2 provided in the embodiment of the present disclosure in a high water temperature state;

[0018] Figure 4 is a schematic diagram of the heat pump system of Example 2 provided in the embodiment of the present disclosure in a normal state;

[0019] Figure 5 is a schematic diagram of a heat pump system according to a third embodiment of the present disclosure;

[0020] Figure 6 is a schematic diagram of a heat pump system according to a fourth embodiment of the present disclosure;

[0021] Figure 7 is a schematic diagram of a heat pump system according to a fifth embodiment of the present disclosure;

[0022] Figure 8 is a schematic diagram of a heat pump system according to a sixth embodiment of the present disclosure;

[0023] Figure 9 Schematic diagram of a water heater provided in an embodiment of the present disclosure.

[0024] Reference numerals:

[0025] 1. Heat pump system; 10. Compressor; 20. Condenser; 30. Reversing valve; 40. Throttle element; 41. First throttle valve; 42. Second throttle valve; 50. Evaporator; 60. Auxiliary heat exchanger; 70. Liquid storage branch; 71. Liquid storage; 711. First inlet of liquid storage; 712. First outlet of liquid storage; 713. Second outlet of liquid storage; 714. Second inlet of liquid storage; 715. Third outlet of liquid storage; 72. High pressure differential passage Shut-off valve assembly; 721, first high-pressure differential conduction valve; 722, first high-pressure differential stop valve; 723, second high-pressure differential conduction valve; 724, second high-pressure differential stop valve; 73, first pipeline; 74, second pipeline; 75, third pipeline; 76, fourth pipeline; 80, refrigerant branch; 90, heat exchange unit; 91, regenerator; 911, first channel; 912, second channel; 92, capillary tube; 100, on-off valve; 101, high-pressure conduction valve; 102, solenoid valve;

[0026] 2. Water heater. DETAILED DESCRIPTION

[0027] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The accompanying drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0028] In the description and claims of the embodiments of the present disclosure, as well as in the accompanying drawings, the terms "first," "second," and the like are used to distinguish similar items and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate to describe the embodiments of the present disclosure herein. In addition, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0029] In the embodiments of the present disclosure, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the embodiments of the present disclosure and their embodiments, and are not intended to limit the indicated devices, elements or components to having a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0030] Furthermore, the terms "disposed," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean a fixed connection, a removable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediary, or an internal connection between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in the embodiments of this disclosure based on the specific circumstances.

[0031] Unless otherwise stated, the term "plurality" means two or more.

[0032] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B means: A or B.

[0033] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0034] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0035] Combine Figures 1 to 4 As shown, the embodiment of the present disclosure provides a heat pump system 1, which reduces the condensing pressure by adjusting the ratio of gaseous refrigerant to liquid refrigerant on the condensing side. The method of adjusting the ratio of gaseous refrigerant to liquid refrigerant on the condensing side is as follows:

[0036] The heat pump system 1 includes a compressor 10, a condenser 20, an outdoor heat exchanger, a reversing valve 30, and a throttling element 40. These components are interconnected to form a refrigerant circulation loop. The outdoor heat exchanger comprises an evaporator 50 and an auxiliary heat exchanger 60, effectively dividing the outdoor heat exchanger into two parts. When the water temperature is greater than or equal to a temperature threshold, i.e., when the water temperature is high, the throttling element 40 is controlled to change its opening, or the reversing valve 30 is controlled to reverse, so that the auxiliary heat exchanger 60 functions as the condenser 20.

[0037] In the heat pump system 1 provided in the embodiments of the present disclosure, the outdoor heat exchanger includes an evaporator 50 and an auxiliary heat exchanger 60. When the water temperature is greater than or equal to a temperature threshold, the throttling element 40 is controlled to change its opening, or the reversing valve 30 is controlled to reverse, thereby allowing the auxiliary heat exchanger 60 to function as the condenser 20. This increases the total condenser volume of the heat pump system 1, changing the volume of the condensing and evaporating sides, reducing the proportion of gaseous refrigerant, and also lowering the condensing pressure for a fixed-frequency heat pump system 1, thereby ensuring reliable operation of the heat pump system 1.

[0038] Example 1:

[0039] Optionally, referring to Figures 1 and 2, the compressor 10, the reversing valve 30, the condenser 20, the auxiliary heat exchanger 60, and the evaporator 50 are sequentially connected. The throttling element 40 includes a first throttle valve 41 and a second throttle valve 42. The first throttle valve 41 is connected to the pipeline between the condenser 20 and the auxiliary heat exchanger 60, and the second throttle valve 42 is connected to the pipeline between the auxiliary heat exchanger 60 and the evaporator 50. By controlling the opening of the first throttle valve 41 and the second throttle valve 42, the auxiliary heat exchanger 60 can be made to perform a condensing or evaporating function.

[0040] The controller is connected to the temperature sensor for measuring the water temperature in communication with each other to obtain the water temperature. The controller is also connected to the first throttle valve 41 and the second throttle valve 42 in communication with each other to control the opening of the first throttle valve 41 and the second throttle valve 42. Figure 1When the water temperature is greater than or equal to the temperature threshold, heat pump system 1 is in a high water temperature state. The first throttle valve 41 is controlled to be fully open and does not throttle. Simultaneously, the second throttle valve 42 is controlled to open to the first opening to throttle. At this point, the auxiliary heat exchanger 60 functions as a condenser, thereby increasing the total condenser volume of heat pump system 1.

[0041] See also Figure 2 When the water temperature is below the temperature threshold, heat pump system 1 is in a normal state. First throttle valve 41 is controlled to open to a certain degree, throttling the flow. Simultaneously, second throttle valve 42 is controlled to be fully open, not throttling the flow. At this point, auxiliary heat exchanger 60 functions as evaporator 50, meeting normal hot water production requirements.

[0042] Optionally, the temperature threshold is 55°C.

[0043] Optionally, the condenser 20 may be a microchannel structure, while the evaporator 50 and the auxiliary heat exchanger 60 may be tube-fin structures. Since the internal volumes of the condenser 20 and the auxiliary heat exchanger 60 differ significantly, the internal volume of the auxiliary heat exchanger 60 does not need to be large enough to meet the requirements for reducing the condensing pressure. In high-temperature operation mode, the small area of ​​the evaporator 50 (the auxiliary heat exchanger 60 no longer serves as an evaporator) will not significantly affect the heat pump system.

[0044] Example 2:

[0045] Optionally, combined Figure 3 and Figure 4 As shown, the controller is in communication with the reversing valve 30 to control the reversing valve 30 to switch the conduction direction. Optionally, the reversing valve 30 is a four-way valve. Figure 3 When the reversing valve 30 is switched to the first conducting direction, the first flow path of the reversing valve is connected to the condenser 20 and the auxiliary heat exchanger 60, and the second flow path of the reversing valve is connected to the throttling element 40 and the evaporator 50, and the compressor 10, condenser 20, auxiliary heat exchanger 60, throttling element 40 and evaporator 50 are connected in sequence. Figure 4 When the reversing valve 30 switches to the second conduction direction, the third flow path of the reversing valve connects the condenser 20 and the throttling element 40, and the fourth flow path of the reversing valve connects the auxiliary heat exchanger 60 and the evaporator 50. Thus, the compressor 10, the condenser 20, the throttling element 40, the auxiliary heat exchanger 60, and the evaporator 50 are sequentially connected. Optionally, the throttling element 40 is a capillary tube.

[0046] Compared with the first embodiment, the second embodiment changes the position of the reversing valve 30 and reduces a throttling component, thereby reducing the condensing pressure by controlling the reversing valve 30 .

[0047] See also Figure 3When the water temperature is greater than or equal to the temperature threshold, heat pump system 1 is in a high water temperature state. The reversing valve 30 is controlled to the first conduction direction, and the auxiliary heat exchanger 60 functions as a condenser. This increases the total condenser volume of heat pump system 1, thereby reducing the condensing pressure. When heat pump system 1 is defrosting, the reversing valve 30 switches direction without affecting the heating efficiency of condenser 20. Furthermore, combined with the flow path layout, the heat from the auxiliary heat exchanger 60 can melt the frost on the evaporator 50.

[0048] See also Figure 4 When the water temperature is lower than the temperature threshold, the heat pump system 1 is in a normal state, the reversing valve 30 is controlled to be in the second conducting direction, and the auxiliary heat exchanger 60 is used as an evaporator.

[0049] Optionally, the temperature threshold is 55°C.

[0050] Combine Figure 5 and Figure 6 As shown, the embodiment of the present disclosure provides another heat pump system 1, which reduces the condensing pressure by adjusting the ratio of gaseous refrigerant to liquid refrigerant on the condensing side. The specific method of adjusting the ratio of gaseous refrigerant to liquid refrigerant on the condensing side is:

[0051] The heat pump system 1 includes: a refrigerant circulation circuit and a liquid storage branch 70. The refrigerant circulation circuit includes a compressor 10, a condenser 20, a throttling element 40 and an evaporator 50 connected in sequence. The liquid storage branch 70 is connected to the refrigerant circulation circuit. In addition, the liquid storage branch 70 can be opened or closed under the influence of the refrigerant pressure, so that the liquid storage branch 70 releases the refrigerant to the refrigerant circulation circuit, or stores the refrigerant in the refrigerant circulation circuit in the liquid storage branch 70, thereby changing the refrigerant circulation amount. When the refrigerant is stored in the liquid storage branch 70, the amount of refrigerant participating in the circulation is reduced, and the proportion of gaseous refrigerant is reduced, thereby reducing the condensing pressure of the heat pump system 1 and maintaining the reliability of the operation of the heat pump system 1.

[0052] The heat pump system 1 provided by the disclosed embodiment incorporates a liquid storage branch 70 within the existing refrigerant circulation loop. This branch is opened or closed by the refrigerant pressure, allowing it to release or store refrigerant, thereby varying the refrigerant circulation volume. When refrigerant is stored in the liquid storage branch 70, the amount of refrigerant participating in the circulation decreases, reducing the proportion of gaseous refrigerant. This lowers the condensing pressure of the fixed-frequency heat pump system 1, maintaining the operational reliability of the heat pump system 1.

[0053] Optionally, the throttling element 40 is a throttle valve.

[0054] Example 3:

[0055] Combine Figure 5As shown, the liquid storage branch 70 includes a liquid reservoir 71 and a high-pressure differential on-off valve assembly 72. The liquid reservoir 71 has an inlet and an outlet. The inlet of the liquid reservoir 71 is connected to the outlet of the condenser 20, and the outlet of the liquid reservoir 71 is connected to the high-pressure side of the heat pump system 1. The high-pressure differential on-off valve assembly 72 is disposed at the inlet and outlet of the liquid reservoir 71 to open or close the liquid storage branch 70 in response to the refrigerant pressure, thereby opening or closing the liquid storage branch 70 and releasing or storing the refrigerant.

[0056] Optionally, the liquid reservoir 71 is provided with a first inlet end 711, and the first inlet end 711 of the liquid reservoir 71 is connected to the outlet of the condenser 20. The liquid reservoir 71 is also provided with a first outlet end 712 and a second outlet end 713. The position of the first outlet end 712 is higher than the position of the second outlet end 713. Optionally, the first outlet end 712 is provided at the top of the liquid reservoir 71, and the second outlet end 713 is provided on the side wall of the liquid reservoir 71 and close to the bottom of the liquid reservoir 71. The first outlet end 712 is connected to the inlet of the throttling element 40 through the first pipeline 73, and the second outlet end 713 is connected to the inlet of the throttling element 40 through the second pipeline 74. It can be understood that the first pipeline 73 and the second pipeline 74 converge into one pipeline at the inlet of the throttling element 40. In this way, it is equivalent to that the outlet end of the liquid reservoir 71 is provided on the high-pressure side of the heat pump system 1.

[0057] The high-pressure differential on-off valve assembly 72 includes a first high-pressure differential on-valve 721 and a first high-pressure differential stop valve 722. The first high-pressure differential on-valve 721 is disposed on the first pipeline 73, corresponding to the first outlet 712 of the liquid reservoir 71. The first high-pressure differential stop valve 722 is disposed on the second pipeline 74, corresponding to the second outlet 713 of the liquid reservoir 71.

[0058] When the water temperature is greater than or equal to the temperature threshold, the heat pump system 1 is in a high water temperature state. Under the influence of the refrigerant pressure, the first high-pressure differential on-valve 721 is in an on state, and the first high-pressure differential off-valve 722 is in an off state. As a result, the gas in the liquid reservoir 71 is released, the liquid level rises, and more refrigerant is stored in the liquid reservoir 71. The amount of refrigerant involved in the circulation decreases, thereby reducing the condensing pressure of the heat pump system 1 and maintaining the reliability of the operation of the heat pump system 1.

[0059] When the water temperature is below the temperature threshold, heat pump system 1 is in a normal state. Under the influence of the refrigerant pressure, first high-pressure differential conduction valve 721 is in a closed state, while first high-pressure differential stop valve 722 is in a conducting state. At this time, the refrigerant circulates through first high-pressure differential stop valve 722. Because the refrigerant in reservoir 71 is two-phase, the refrigerant level in reservoir 71 can be controlled to maintain at level A, and reservoir 71 only stores a small amount of refrigerant.

[0060] Optionally, the temperature threshold is 55°C.

[0061] Example 4:

[0062] Combine Figure 6 As shown, the liquid storage branch 70 includes: a liquid reservoir 71 and a high-pressure differential on-off valve assembly 72. The liquid reservoir 71 is provided with a second inlet end 714 and a third outlet end 715. The second inlet end 714 of the liquid reservoir 71 is connected to the outlet of the condenser 20, and the third outlet end 715 of the liquid reservoir 71 is connected to the low-pressure side of the heat pump system 1. In this way, the refrigerant flowing out of the condenser 20 can be divided: one part flows into the liquid reservoir 71, and the other part flows into the throttling element 40. The high-pressure differential on-off valve assembly 72 is provided at the second inlet end 714 and the third outlet end 715 of the liquid reservoir 71 to be opened or closed under the action of the refrigerant pressure, thereby opening or closing the liquid storage branch 70, and realizing that the liquid storage branch 70 releases or stores the refrigerant.

[0063] Optionally, the second inlet end 714 of the liquid reservoir 71 is connected to the pipeline between the outlet of the condenser 20 and the inlet of the throttling element 40 via a third pipeline 75. The third outlet end 715 of the liquid reservoir 71 is connected to the outlet of the evaporator 50 and the inlet of the compressor 10 via a fourth pipeline 76. In this way, the outlet end of the liquid reservoir 71 is equivalent to being arranged on the low-pressure side of the heat pump system 1. Optionally, the connection point of the fourth pipeline 76 is before the refrigerant passes through the reversing valve 30.

[0064] The high-pressure differential on-off valve assembly 72 includes a second high-pressure differential on-valve 723 and a second high-pressure differential stop valve 724. The second high-pressure differential on-valve 723 is disposed on the third pipeline 75, corresponding to the second inlet port 714 of the liquid reservoir 71. The second high-pressure differential stop valve 724 is disposed on the fourth pipeline 76, corresponding to the third outlet port 715 of the liquid reservoir 71.

[0065] When the water temperature is greater than or equal to the temperature threshold, heat pump system 1 is in a high water temperature state. Under the influence of the refrigerant pressure, second high-pressure differential conduction valve 723 is in an open state, while first high-pressure differential shut-off valve 722 is in a closed state. At this point, due to the pressure differential, liquid refrigerant is stored in reservoir 71, reducing the amount of refrigerant circulating in the refrigerant circulation loop. This lowers the condensing pressure of heat pump system 1, maintaining its operational reliability. Once the water temperature drops or the system shuts down, second high-pressure differential shut-off valve 724 opens, releasing the refrigerant.

[0066] When the water temperature is lower than the temperature threshold, the heat pump system 1 is in a normal state. Under the influence of the refrigerant pressure, the second high-pressure differential conduction valve 723 is in a closed state, and the second high-pressure differential shut-off valve 724 is in a conducting state. At this time, the refrigerant does not pass through the liquid reservoir 71, and the refrigerant circulation volume is relatively large.

[0067] Optionally, the temperature threshold is 55°C.

[0068] Compared with Example 1 and Example 2, Example 3 and Example 4 add a liquid storage branch 70 in the heat pump system 1. Through the cooperation of the liquid reservoir 71 and the high-pressure differential on-off valve assembly 72, the liquid reservoir 71 plays the role of storing refrigerant, thereby reducing the amount of refrigerant participating in the circulation, and further reducing the condensing pressure of the heat pump system 1.

[0069] Combine Figure 7 and Figure 8 As shown, the embodiment of the present disclosure provides another heat pump system 1, which reduces the condensing pressure by adjusting the ratio of gaseous refrigerant to liquid refrigerant on the condensing side. The specific method of adjusting the ratio of gaseous refrigerant to liquid refrigerant on the condensing side is:

[0070] The heat pump system 1 comprises: a compressor 10, a condenser 20, a throttling element 40 and an evaporator 50, which are sequentially connected to form a refrigerant circulation loop. Optionally, the throttling element 40 is a throttle valve.

[0071] The heat pump system 1 also includes a refrigerant branch 80, a heat exchange unit 90, and an on-off valve 100. The first end of the refrigerant branch 80 is connected between the outlet of the compressor 10 and the inlet of the condenser 20. The second end of the refrigerant branch 80 is connected to the high-pressure side or the low-pressure side of the heat pump system 1. In this way, the refrigerant flowing out of the outlet of the compressor 10 is split before entering the condenser 20: a portion of the refrigerant enters the condenser 20, and the other portion of the refrigerant can enter the refrigerant branch 80. Specifically, the first end of the refrigerant branch 80 is connected to the position after the refrigerant passes through the reversing valve 30. The heat exchange unit 90 is arranged on the refrigerant branch 80 and is correspondingly arranged with the pipeline connected to the outlet of the evaporator 50 to exchange heat with this pipeline. The on-off valve 100 is arranged on the refrigerant branch 80 and can be opened or closed.

[0072] The heat pump system 1 provided by the embodiment of the present disclosure is adopted, and a refrigerant branch 80, a heat exchange part 90 and an on-off valve 100 are added to the original refrigerant circulation loop. One end of the refrigerant branch 80 is connected between the outlet of the compressor 10 and the inlet of the condenser 20, and the other end is connected to the high-pressure side or the low-pressure side of the heat pump system 1, so that the refrigerant can be bypassed and diverted before the refrigerant enters the condenser 20. The diverted refrigerant exchanges heat in the heat exchange part 90, and then enters the refrigerant circulation loop through the conductive on-off valve 100 for circulation. In this way, by setting the bypass refrigerant branch 80, the gaseous refrigerant is bypassed to reduce the proportion of the gaseous refrigerant, thereby reducing the condensing pressure of the fixed-frequency heat pump system 1 and maintaining the reliability of the operation of the heat pump system 1.

[0073] Embodiment 5:

[0074] Combine Figure 7 As shown, the heat exchange unit 90 includes a regenerator 91. The regenerator 91 is provided with a first channel 911 and a second channel 912. A portion of the refrigerant branch 80 is disposed within the first channel 911, and a portion of the pipeline between the outlet of the evaporator 50 and the reversing valve 30 is disposed within the second channel 912. The second end of the refrigerant branch 80 is connected to the high-pressure side of the heat pump system 1. Specifically, the second end of the refrigerant branch 80 is connected to the pipeline between the outlet of the condenser 20 and the inlet of the throttling element 40.

[0075] Optionally, the on-off valve 100 is opened or closed under the influence of the refrigerant pressure.

[0076] Optionally, the on-off valve 100 is a high-pressure on-valve 101 .

[0077] Optionally, when the water temperature is greater than or equal to a temperature threshold, the heat pump system 1 is in a high water temperature state, and the high-pressure conduction valve 101 is in a conducting state due to the refrigerant pressure. At this time, a portion of the refrigerant enters the condenser 20, and another portion enters the regenerator 91. The regenerator 91 operates to exchange heat between the refrigerant in the first channel 911 and the refrigerant in the second channel 912, separating a portion of the refrigerant from the condenser 20, thereby reducing the condensing pressure of the heat pump system 1. Furthermore, the suction temperature can be increased, thereby reducing the suction port density and mass flow rate. When the water temperature is less than the temperature threshold, the heat pump system 1 is in a normal state, the high-pressure conduction valve 101 is in a closed state due to the refrigerant pressure, and the regenerator 91 is inoperative.

[0078] Compared with Examples 1 to 4, Example 5 adds a refrigerant branch 80 and a regenerator 91 to the heat pump system 1. Through the cooperation of the high-pressure conduction valve 101, the regenerator 91 is used to separate part of the gas in the condenser 20, thereby reducing the condensing pressure of the heat pump system 1.

[0079] Alternatively, the high-pressure conduction valve 101 can be replaced with a solenoid valve / high-pressure valve controlled by a controller, with water temperature / pressure as the triggering condition. When the water temperature is greater than or equal to a temperature threshold, the solenoid valve is controlled to open, bypassing the high-pressure refrigerant. When the water temperature is less than the temperature threshold, normal operation is resumed. Alternatively, when the pressure is greater than or equal to a pressure threshold, the high-pressure valve is controlled to open, bypassing the high-pressure refrigerant. When the pressure is less than the pressure threshold, normal operation is resumed.

[0080] Optionally, the temperature threshold is 55° C. and the pressure threshold is 4.3 MPa.

[0081] Example 6:

[0082] Combine Figure 8As shown, the heat exchange unit 90 includes a capillary tube 92. The capillary tube 92 is wound around the outside of the pipeline between the outlet of the evaporator 50 and the reversing valve 30. The capillary tube 92 is also connected to the refrigerant branch 80. A controller is in communication with the on-off valve 100 to control the on / off state of the on-off valve 100. Specifically, the second end of the refrigerant branch 80 is connected to the low-pressure side of the heat pump system 1. Specifically, the second end of the refrigerant branch 80 is connected to the pipeline between the outlet of the throttling element 40 and the inlet of the evaporator 50.

[0083] Optionally, the on-off valve 100 is a solenoid valve 102 .

[0084] Optionally, when the water temperature is greater than or equal to a temperature threshold, the heat pump system 1 is in a high water temperature state, and the solenoid valve 102 is controlled to be in an on state. At this point, a portion of the refrigerant enters the condenser 20, while another portion enters the capillary tube 92, which is functional. The capillary tube 92 not only exchanges heat with the piping connected to the evaporator 50 outlet, but also acts as a throttling device, thereby reducing the condensing pressure of the heat pump system 1. When the water temperature is below the temperature threshold, the heat pump system 1 is in a normal state, the solenoid valve 102 is controlled to be in an off state, and the capillary tube 92 is inoperative.

[0085] Compared with the fifth embodiment, the sixth embodiment uses a capillary tube 92 instead of the regenerator 91, which can also reduce the condensing pressure of the heat pump system 1. It can also reduce the overall volume of the system and make the control simpler.

[0086] Combine Figure 9 As shown, an embodiment of the present disclosure provides a water heater 2 including the above-mentioned heat pump system 1 .

[0087] The above description and the accompanying drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless expressly required, individual components and functions are optional, and the order of operations may vary. Portions and features of some embodiments may be included in or replace portions and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A heat pump system, characterized in that: The condensing pressure is reduced by adjusting the ratio of gaseous refrigerant to liquid refrigerant on the condensing side. The ratio of gaseous refrigerant to liquid refrigerant on the condensing side is adjusted as follows: The heat pump system includes: a compressor, a condenser, an outdoor heat exchanger, a reversing valve and a throttling element connected to form a refrigerant circulation loop; The outdoor heat exchanger includes an evaporator and an auxiliary heat exchanger. When the water temperature is greater than or equal to a temperature threshold, the throttling element is controlled to change the opening or the reversing valve is controlled to reverse, so that the auxiliary heat exchanger is used as a condenser.

2. The heat pump system according to claim 1, characterized in that The compressor, the reversing valve, the condenser, the auxiliary heat exchanger and the evaporator are connected in sequence; The throttling elements include: The first throttle valve is connected between the condenser and the auxiliary heat exchanger; The second throttle valve is connected between the evaporator and the auxiliary heat exchanger.

3. The heat pump system according to claim 2, characterized in that When the water temperature is greater than or equal to the temperature threshold, the first throttle valve is in a fully open state, the second throttle valve is used for throttling, and the auxiliary heat exchanger is used as a condenser; When the water temperature is less than or equal to the temperature, the first throttle valve is used for throttling, the second throttle valve is in a fully open state, and the auxiliary heat exchanger is used as an evaporator.

4. The heat pump system according to claim 1, characterized in that When the reversing valve is switched to the first conducting direction, the first flow path of the reversing valve is connected to the condenser and the auxiliary heat exchanger, the second flow path of the reversing valve is connected to the throttling element and the evaporator, and the condenser, the auxiliary heat exchanger, the throttling element and the evaporator are connected in sequence; When the reversing valve is switched to the second conducting direction, the third flow path of the reversing valve connects the condenser and the throttling element, the fourth flow path of the reversing valve connects the auxiliary heat exchanger and the evaporator, and the condenser, throttling element, auxiliary heat exchanger and evaporator are connected in sequence.

5. The heat pump system according to claim 4, characterized in that When the water temperature is greater than or equal to the temperature threshold, the reversing valve is in the first conduction direction, and the auxiliary heat exchanger is used as a condenser; When the water temperature is lower than the temperature threshold, the reversing valve is in the second conducting direction, and the auxiliary heat exchanger is used as an evaporator.

6. A heat pump system, characterized in that: The condensing pressure is reduced by adjusting the ratio of gaseous refrigerant to liquid refrigerant on the condensing side. The ratio of gaseous refrigerant to liquid refrigerant on the condensing side is adjusted as follows: The heat pump system includes: The compressor, condenser, throttling element and evaporator are connected in sequence to form a refrigerant circulation loop; The liquid storage branch is connected to the refrigerant circulation loop and can be opened or closed under the influence of the refrigerant pressure, so that the liquid storage branch releases or stores refrigerant, thereby changing the refrigerant circulation volume.

7. The heat pump system according to claim 6, characterized in that The liquid storage branch includes: The liquid reservoir is provided with an inlet end and an outlet end; the inlet end of the liquid reservoir is connected to the outlet of the condenser, and the outlet end of the liquid reservoir is connected to the high-pressure side or the low-pressure side of the heat pump system; The high-pressure differential on-off valve assembly is installed at the inlet and outlet of the liquid storage device, and is turned on or off in accordance with the refrigerant pressure to release or store the refrigerant in the liquid storage branch.

8. The heat pump system according to claim 7, characterized in that The liquid reservoir is provided with a first inlet end, a first outlet end, and a second outlet end, wherein the first outlet end is located higher than the second outlet end; the first inlet end of the liquid reservoir is connected to the outlet end of the condenser, and the first outlet end and the second outlet end of the liquid reservoir are both connected to the inlet of the throttling element; The high-pressure differential on-off valve assembly comprises: a first high-pressure differential on-valve, arranged at a first outlet end of the liquid reservoir; a first high-pressure differential stop valve, arranged at a second outlet end of the liquid reservoir; When the water temperature is greater than or equal to the temperature threshold, the first high-pressure differential on-valve is in an on state, and the first high-pressure differential off-valve is in an off state; When the water temperature is lower than the temperature threshold, the first high-pressure differential on-valve is in the cut-off state, and the second high-pressure differential off-valve is in the on-state.

9. The heat pump system according to claim 7, characterized in that The liquid storage branch includes: The liquid accumulator is provided with a second inlet end and a third outlet end, the inlet end of the liquid accumulator is connected between the condenser and the throttling element, and the third outlet end of the liquid accumulator is connected between the evaporator and the compressor; The high-pressure differential on-off valve assembly includes: a second high-pressure differential on-valve, arranged at the second inlet end of the liquid reservoir; a second high-pressure differential stop valve, arranged at the third outlet end of the liquid reservoir; When the water temperature is greater than or equal to the temperature threshold, the second high-pressure differential on-valve is in an on state, and the second high-pressure differential off-valve is in an off state; When the water temperature is lower than the temperature threshold, the second high-pressure differential conduction valve is in the cut-off state, and the second high-pressure differential cut-off valve is in the conduction state.

10. A heat pump system, characterized in that: The condensing pressure is reduced by adjusting the ratio of gaseous refrigerant to liquid refrigerant on the condensing side. The ratio of gaseous refrigerant to liquid refrigerant on the condensing side is adjusted as follows: The heat pump system includes: The compressor, condenser, throttling element and evaporator are connected in sequence to form a refrigerant circulation loop; The refrigerant branch has one end connected between the compressor outlet and the condenser inlet, and the other end connected to the high-pressure side or low-pressure side of the heat pump system; The heat exchange part is provided in the refrigerant branch and is correspondingly provided with a pipe connected to the outlet of the evaporator for heat exchange; The on-off valve is installed in the refrigerant branch and can be turned on or off.

11. The heat pump system according to claim 10, characterized in that The heat exchange section includes: The regenerator is provided with a first channel and a second channel, the refrigerant branch is provided in the first channel, and the outlet pipe of the evaporator is provided in the second channel; When the water temperature is greater than or equal to the temperature threshold, the on-off valve is in the on state due to the influence of the refrigerant pressure, so that the regenerator can function; When the water temperature is lower than the temperature threshold, the on-off valve is in the cut-off state due to the influence of the refrigerant pressure, so that the regenerator does not work.

12. The heat pump system according to claim 10, characterized in that The heat exchange section includes: The capillary tube is wound around the pipe connected to the evaporator outlet and connected to the refrigerant branch; When the water temperature is greater than or equal to the temperature threshold, the on-off valve is controlled to be in the on state to enable the capillary tube to function; When the water temperature is lower than the temperature threshold, the on-off valve is controlled to be in the cut-off state so that the capillary tube does not function.

13. A water heater, characterized in that: The heat pump system comprises the heat pump system according to any one of claims 1 to 12.

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