Liquid accumulator for heat pump unit and heat pump unit

Abstract

The utility model relates to the technical field of heat pump units, and discloses a liquid storage device for a heat pump unit. The liquid storage device comprises a first cavity used for being communicated with a second heat exchanger, located on the air side, of the heat pump unit; the second cavity and the first cavity share a first cavity wall; a plurality of one-way flow guide holes are formed in the wall of the first cavity in the height direction, so that one-way conduction from the first cavity to the second cavity is achieved; the second cavity is used for communicating with a second heat exchanger located on the air side and a first heat exchanger located on the user side of the heat pump unit. A hollow cavity is formed in the buoyancy lifting structure, a liquid outlet communicating with the hollow cavity is formed in the buoyancy lifting structure, the buoyancy lifting structure is movably arranged in the first cavity, the liquid outlet corresponds to the vertical position where the one-way flow guide hole is located, and the hollow cavity communicates with the second heat exchanger; according to the application, timely response can be performed under the condition that the working condition of the heat pump unit changes, and the operation stability of the heat pump unit is improved. The utility model further discloses a heat pump unit.

Description

Technical Field

[0001] The present application relates to the technical field of heat pump units, for example, to a liquid storage device for a heat pump unit and a heat pump unit. Background Art

[0002] The air source heat pump unit has a heating function in the heating season and a cooling function in the cooling season. When the heat pump unit is in heating operation, the heat exchanger as the condenser is located on the user side, and the heat exchanger as the evaporator is located on the air side; when it is in cooling operation, it is the opposite. The heat exchanger as the condenser is located on the air side, and the heat exchanger as the evaporator is located on the user side. Due to space utilization and cost limitations, the heat pump unit cannot have two heat exchangers with the same heat exchange area. This will cause a situation where, when a certain amount of refrigerant is injected into the same heat pump unit, the amount of refrigerant participating in the circulation during heating operation will be less than the amount of refrigerant participating in the circulation during cooling operation, resulting in the heat pump unit's heating and cooling operations being difficult to achieve the expected results.

[0003] In order to improve the heating or cooling effect of the heat pump unit in heating and cooling operation, the relevant technology will configure a liquid reservoir in the heat pump unit. When the heat pump unit is in heating operation, the amount of refrigerant involved in the cycle is small, and the excess refrigerant in the heat pump unit will be stored in the liquid reservoir; when the heat pump unit is in cooling operation, the amount of refrigerant involved in the cycle is large, and the refrigerant stored in the liquid reservoir will also participate in the refrigeration cycle.

[0004] In the process of implementing the embodiments of the present disclosure, it was found that there are at least the following problems in the related technology: when the air source heat pump unit is in refrigeration operation, the amount of refrigerant participating in the refrigeration cycle in the liquid storage tank is fixed, and when the operating conditions suddenly change or the line control state changes, the refrigeration effect of the heat pump unit is affected.

[0005] 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 the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0006] 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 components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0007] The disclosed embodiments provide a liquid reservoir and a heat pump unit for a heat pump unit, which can enable the heat pump unit to store excess refrigerant through the liquid reservoir in a heating mode and to self-regulate the refrigerant through the liquid reservoir in a cooling mode, so as to respond promptly to changes in the operating conditions of the heat pump unit and improve the stability of the operation of the heat pump unit.

[0008] In some embodiments, a liquid storage device for a heat pump unit includes: a first cavity for communicating with a second heat exchanger located on the air side of the heat pump unit; a second cavity having a common first cavity wall with the first cavity; a plurality of one-way flow guide holes are arranged on the first cavity wall along the height direction to realize one-way conduction from the first cavity to the second cavity; the second cavity is used to communicate with the second heat exchanger located on the air side and the first heat exchanger located on the user side of the heat pump unit respectively; a buoyancy lifting structure having a hollow cavity inside and a liquid outlet communicating with the hollow cavity, and the buoyancy lifting structure is movably arranged in the first cavity, The liquid outlet corresponds to the vertical position of the one-way guide hole, and the hollow cavity is connected to the second heat exchanger; when the fluid flowing through the second heat exchanger flows into the first cavity, the buoyancy lifting structure can float, and at the same time, when the fluid flowing through the second heat exchanger flows into the hollow cavity of the buoyancy lifting structure, the buoyancy lifting structure can move in the first cavity under the buoyancy provided by the fluid inside the first cavity, and when the liquid outlet of the buoyancy lifting structure corresponds to the one-way guide hole, they can be tangent to each other and make the one-way guide hole one-way conductive so that the fluid in the buoyancy lifting structure flows to the second cavity, so as to adjust the amount of fluid in the second cavity.

[0009] Optionally, the first cavity is cylindrical; the buoyancy lifting structure includes: a liquid level ball having a hollow cavity inside, and the outer wall of the liquid level ball is arranged tangent to the inner wall of the first cavity.

[0010] Optionally, a plurality of through holes are arranged on the first cavity wall along the height direction, and a one-way valve is arranged on each through hole to form a one-way flow guide hole to achieve one-way conduction from the first cavity to the second cavity.

[0011] Optionally, a ventilation structure is provided on the shell corresponding to the upper part of the first cavity.

[0012] Optionally, the liquid storage device also includes: a first liquid inlet pipe, a first end of which is connected to the hollow cavity of the buoyancy lifting structure, and a second end of which is used to connect to the second heat exchanger, so that the refrigerant flowing through the second heat exchanger flows into the hollow cavity of the buoyancy lifting structure, so that the hollow cavity stores fluid; a second liquid inlet pipe, a first end of which is connected to the first cavity, and a second end of which is used to connect to the second heat exchanger; the second liquid inlet pipe can be opened or closed to adjust the amount of fluid flowing into the first cavity, so as to control the moving position of the buoyancy lifting structure.

[0013] Optionally, the second end of the second liquid inlet pipe is connected to the first liquid inlet pipe.

[0014] In some embodiments, the heat pump unit includes: a heat pump unit system, including a first heat exchanger located on the user side and a second heat exchanger located on the air side; and, a liquid storage device for the heat pump unit as described above, wherein the second cavity is connected to the first heat exchanger and the second heat exchanger respectively; the first cavity is connected to the second heat exchanger through a second liquid inlet pipe, and the hollow cavity of the buoyancy lifting structure is connected to the second heat exchanger through the first liquid inlet pipe; wherein, in the refrigeration condition, part of the fluid flowing through the second heat exchanger flows into the first liquid inlet pipe, and the second liquid inlet pipe is turned on or off according to the fluid pressure of the first liquid inlet pipe.

[0015] Optionally, the heat pump unit also includes: a first refrigerant pipe connected to the first heat exchanger; a second refrigerant pipe connected to the second heat exchanger; wherein the first refrigerant pipe and the second refrigerant pipe both extend into the second cavity, and the length of the first refrigerant pipe extending therein is greater than the length of the second refrigerant pipe extending therein.

[0016] Optionally, the heat pump unit further includes: a first throttling device connected to the second refrigerant pipe; a second throttling device, a first end of which is respectively connected to the first liquid inlet pipe and the second liquid inlet pipe, and a second end of which is connected to the second heat exchanger.

[0017] Optionally, the heat pump unit further includes: a control valve, arranged on the second liquid inlet pipe, for controlling the conduction or cutoff of the second liquid inlet pipe; and / or a flow valve, arranged on the first liquid inlet pipe, for controlling the amount of fluid flowing into the buoyancy lifting structure.

[0018] Optionally, the heat pump unit also includes: a piston device, connected to the part of the liquid inlet pipe between the control valve and the first cavity in the second liquid inlet pipe, including an upper cavity, a lower cavity and a piston located between the upper and lower cavities; wherein the area size of the upper cavity and the lower cavity is adjusted by the up and down movement of the piston; the upper cavity is used to store fluid, and the lower cavity is provided with an air hole, which is used to inject gas or discharge gas to make the piston move up and down, so that the fluid in the upper cavity flows into the first cavity or the fluid in the first cavity flows into the upper cavity.

[0019] The liquid storage device and heat pump unit provided in the embodiments of the present disclosure can achieve the following technical effects:

[0020] The liquid reservoir is divided into an independent first cavity and a second cavity. When the heat pump unit is in heating operation, the fluid flows through the first heat exchanger, the liquid reservoir, and the second heat exchanger in sequence, and is connected to the second heat exchanger on the air side of the pump unit and the first heat exchanger on the user side through the second cavity of the liquid reservoir, so that in the heating condition, only the fluid in the second cavity of the liquid reservoir participates in the fluid circulation of the heat pump unit. At this time, the liquid reservoir only has a liquid storage function, and the fluid flowing from the second cavity of the liquid reservoir to the second heat exchanger can meet the fluid volume required by the heat pump unit. When the heat pump unit is in refrigeration operation, the fluid flows through the second heat exchanger, the liquid reservoir and the first heat exchanger in sequence, and is connected with the second cavity, the hollow cavity of the buoyancy lifting structure and the first cavity respectively through the second heat exchanger. The first heat exchanger is connected with the second cavity, so that part of the fluid flowing out through the second heat exchanger flows into the second cavity, part flows into the hollow cavity of the buoyancy lifting structure, and part flows into the first cavity as needed. It should be noted that the fluid flowing into the first cavity is used to provide buoyancy for the buoyancy lifting structure to adjust the moving height of the buoyancy lifting structure, thereby adjusting whether the buoyancy lifting structure is in a corresponding state with the one-way guide hole, and then flows out from the second cavity to the first heat exchanger. Since the amount of fluid flowing into the first cavity can control the moving height of the buoyancy lifting structure, and the first cavity wall is provided with a plurality of one-way guide holes that ensure that the fluid can only flow from the first cavity to the second cavity, when the buoyancy lifting structure moves to different heights, the liquid outlet of the buoyancy lifting structure will be tangent to the corresponding one-way guide hole and open the one-way guide hole, so that the fluid in the hollow cavity can flow to the second cavity in a timely manner according to demand, thereby controlling the amount of fluid in the second cavity, and then controlling the amount of fluid in the second cavity participating in the refrigeration cycle of the heat pump unit, and realizing automatic flow regulation in the refrigeration operation of the heat pump unit. In this way, by automatically controlling the storage and release of the fluid, the problem of the change of the fluid circulation amount of the heat pump unit under different working conditions is effectively solved, and the heat pump unit can store excess fluid through the liquid reservoir in the heating mode, and self-regulate the fluid through the liquid reservoir in the cooling mode, so as to respond in time when the working condition of the heat pump unit changes, and improve the stability of the operation of the heat pump unit.

[0021] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0023] Figure 1 is a structural schematic diagram of a liquid storage device for a heat pump unit provided by an embodiment of the present disclosure;

[0024] Figure 2 is a structural schematic diagram of a heat pump unit system provided by an embodiment of the present disclosure;

[0025] Figure 3 is a structural schematic diagram of a heat pump unit provided by an embodiment of the present disclosure;

[0026] Figure 4 is a structural schematic diagram of another heat pump unit provided by an embodiment of the present disclosure;

[0027] Figure 5 is a structural schematic diagram of another heat pump unit provided by an embodiment of the present disclosure;

[0028] Figure 6 It is a structural schematic diagram of another heat pump unit provided in an embodiment of the present disclosure.

[0029] Reference numerals:

[0030] 1. Liquid storage tank; 2. Heat pump unit;

[0031] 10. first cavity; 101. ventilation structure;

[0032] 20. Second cavity;

[0033] 30. Buoyancy lifting structure;

[0034] 40. A first liquid inlet pipe;

[0035] 50. Second liquid inlet pipe;

[0036] 60. One-way flow guide hole;

[0037] 70. Heat pump unit system; 701. First heat exchanger; 702. Second heat exchanger; 703. Compressor; 704. Four-way valve;

[0038] 80. The first refrigerant pipe;

[0039] 90. Second refrigerant pipe;

[0040] 100, first throttling device;

[0041] 110. Second throttling device;

[0042] 120. Control valve;

[0043] 130. Flow valve;

[0044] 140. Pressure sensor;

[0045] 150, piston device; 1501, upper cavity; 1502, lower cavity;

[0046] 160. Valve body. DETAILED DESCRIPTION

[0047] In order to be able to understand the features and technical contents 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 attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the 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.

[0048] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0049] 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 have 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.

[0050] In addition, the terms "disposed", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0051] Unless otherwise stated, the term "plurality" means two or more.

[0052] 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 indicates: A or B.

[0053] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0054] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0055] Combination Figure 1 As shown, the embodiment of the present disclosure provides a liquid storage device 1 for a heat pump unit, including a first cavity 10, a second cavity 20 and a buoyancy lifting structure 30. The first cavity 10 is used to communicate with the second heat exchanger 702 located on the air side of the heat pump unit 2. The second cavity 20 and the first cavity 10 have a common first cavity wall. A plurality of one-way flow guide holes 60 are arranged on the first cavity wall along the height direction to realize one-way conduction from the first cavity 10 to the second cavity 20. The second cavity 20 is used to communicate with the second heat exchanger 702 located on the air side of the heat pump unit 2 and the first heat exchanger 701 located on the user side. The buoyancy lifting structure 30 has a hollow cavity inside and is provided with a liquid outlet communicating with the hollow cavity. The buoyancy lifting structure 30 is movably arranged in the first cavity 10, and the liquid outlet corresponds to the vertical position of the one-way flow guide hole 60, and the hollow cavity is communicated with the second heat exchanger 702. When the fluid flowing through the second heat exchanger 702 flows into the first cavity 10, the buoyancy lifting structure 30 can float. At the same time, when the fluid flowing through the second heat exchanger 702 flows into the hollow cavity of the buoyancy lifting structure 30, the buoyancy lifting structure 30 can move in the first cavity 10 under the buoyancy provided by the fluid inside the first cavity 10, and when the liquid outlet of the buoyancy lifting structure 30 corresponds to the one-way guide hole 60, they can be tangent to each other and make the one-way guide hole 60 one-way conductive so that the fluid in the buoyancy lifting structure 30 flows to the second cavity 20, so as to adjust the amount of fluid in the second cavity 20.

[0056] It is understandable that when the heat pump unit 2 is in heating operation, the first heat exchanger 701 serves as a condenser and the second heat exchanger 702 serves as an evaporator. When the heat pump unit 2 is in cooling operation, the first heat exchanger 701 serves as an evaporator and the second heat exchanger 702 serves as a condenser.

[0057] For example, the number of the plurality of unidirectional flow guide holes 60 may be set to 4, 5, 6, 7, 8, 9 or 10.

[0058] Exemplarily, every two unidirectional flow guide holes 60 are arranged at the same height.

[0059] In the disclosed embodiment, the liquid reservoir 1 is divided into an independent first cavity 10 and a second cavity 20. When the heat pump unit 2 is in heating operation, the fluid flows through the first heat exchanger 701, the liquid reservoir 1, and the second heat exchanger 702 in sequence, and is connected to the second heat exchanger 702 on the air side and the first heat exchanger 701 on the user side of the pump unit through the second cavity 20 of the liquid reservoir 1, so that in the heating condition, only the fluid in the second cavity 20 of the liquid reservoir 1 participates in the fluid circulation of the heat pump unit 2. At this time, the liquid reservoir 1 only has a liquid storage function, and the fluid flowing from the second cavity 20 of the liquid reservoir 1 to the second heat exchanger 702 can meet the fluid volume required by the heat pump unit 2. When the heat pump unit 2 is in cooling operation, the fluid flows through the second heat exchanger 702, the liquid storage tank 1 and the first heat exchanger 701 in sequence, and is respectively connected with the second cavity 20, the hollow cavity of the buoyancy lifting structure 30 and the first cavity 10 through the second heat exchanger 702. The first heat exchanger 701 is connected with the second cavity 20, so that part of the fluid flowing out through the second heat exchanger 702 flows into the second cavity 20, part flows into the hollow cavity of the buoyancy lifting structure 30, and part flows into the first cavity 10 as needed. It should be noted that the fluid flowing into the first cavity 10 is used to provide buoyancy for the buoyancy lifting structure 30 to adjust the moving height of the buoyancy lifting structure 30, thereby adjusting whether the buoyancy lifting structure 30 is in a corresponding state with the one-way guide hole 60, and then flows out from the second cavity 20 to the first heat exchanger 701. Since the amount of fluid flowing into the first cavity 10 can control the moving height of the buoyancy lifting structure 30, and the first cavity wall is provided with a plurality of one-way guide holes 60 to ensure that the fluid can only flow from the first cavity 10 to the second cavity 20, when the buoyancy lifting structure 30 moves to different heights, the liquid outlet of the buoyancy lifting structure 30 will be tangent to the corresponding one-way guide hole 60 and open the one-way guide hole 60, so that the fluid in the hollow cavity can flow to the second cavity 20 in a timely manner as needed, thereby controlling the amount of fluid in the second cavity 20, and then controlling the amount of fluid in the second cavity 20 participating in the refrigeration cycle of the heat pump unit 2, thereby realizing automatic flow adjustment during the refrigeration operation of the heat pump unit 2. In this way, by automatically controlling the storage and release of the fluid, the problem of changes in the fluid circulation volume of the heat pump unit 2 under different operating conditions is effectively solved, and the heat pump unit 2 can store excess fluid through the liquid reservoir 1 in the heating mode and perform fluid self-regulation through the liquid reservoir 1 in the cooling mode, so as to respond in time to changes in the operating conditions of the heat pump unit 2 and improve the stability of the operation of the heat pump unit 2.

[0060] In addition, the disclosed embodiment can automatically adjust fluid distribution according to the actual operating conditions of the heat pump unit 2, effectively solving the problem that the fluid circulation volume is difficult to accurately control under different operating conditions, and improving the overall operating efficiency and stability of the heat pump unit 2.

[0061] Alternatively, if Figure 1As shown, the first cavity 10 is cylindrical, and the buoyancy lifting structure 30 includes a liquid level ball. The liquid level ball has a hollow cavity inside, and the outer wall of the liquid level ball is tangent to the inner wall of the first cavity 10.

[0062] In the disclosed embodiment, the first cavity 10 is cylindrical in design, and the buoyancy lifting structure 30 includes a liquid level ball. In this way, based on the buoyancy characteristics of the liquid level ball, when the liquid level ball is in the fluid flowing into the first cavity 10, it can be moved by the buoyancy of the same volume of the fluid displaced by it. The outer wall of the liquid level ball is tangent to the inner wall of the first cavity 10, so that the liquid level ball can change position very smoothly with the change of the fluid level during the movement, and there is no stuck phenomenon, which ensures the sensitivity and accuracy of the fluid flow control. At the same time, as the amount of fluid flowing into the first cavity 10 from the second heat exchanger 702 changes, the liquid level ball will move to different heights accordingly, so that the liquid outlet of the liquid level ball is aligned with the corresponding one-way guide hole 60, and the fluid in the liquid level ball flows into the second cavity 20 through the one-way guide hole 60, thereby accurately and in real time adjusting the fluid stock in the second cavity 20 to meet the fluid circulation requirements of the entire heat pump unit 2 during the refrigeration operation.

[0063] Optionally, a plurality of through holes are provided on the first cavity wall along the height direction, and a one-way valve is provided on each through hole to form a one-way guide hole 60 to achieve one-way conduction from the first cavity 10 to the second cavity 20 .

[0064] It is understandable that when the liquid outlet of the buoyancy lifting structure 30 is in a corresponding state with the through hole, the one-way valve corresponding to the through hole is opened, thereby enabling the fluid to flow from the first cavity 10 to the second cavity 20 through the one-way guide hole 60 .

[0065] In the disclosed embodiment, the one-way flow guide hole 60 is formed by the through hole and the corresponding one-way valve. The multiple one-way flow guide holes 60 are located at different heights of the first cavity wall to match the buoyancy lifting structure 30 moved to different heights, that is, when the buoyancy lifting structure 30 (such as a liquid level ball) moves with the change of the fluid level in the first cavity 10, the corresponding one-way flow guide hole 60 will be opened or closed in time, and the fluid can flow from the hollow cavity to the second cavity 20 in one direction as required. In this way, the fluid can be finely regulated according to the actual needs and operating conditions of the heat pump unit 2 to enter the second cavity 20, which is conducive to ensuring the balance and high efficiency of the internal fluid circulation of the heat pump unit 2.

[0066] Optionally, a vent structure 101 is provided on the shell corresponding to the upper part of the first cavity 10. Exemplarily, the vent structure 101 may be a vent. In this way, the air inside and outside the first cavity 10 is exchanged through the vent structure 101 to maintain the pressure balance between the inside of the first cavity 10 and the outside, avoiding safety hazards caused by excessive pressure or affecting the normal operation of the system due to low pressure.

[0067] Optionally, the liquid reservoir 1 further comprises a filter screen, which is arranged on the ventilation structure 101. In this way, external dust, impurities, etc. can be effectively blocked from entering the first cavity 10 to prevent them from contaminating the fluid or clogging the pipeline, thereby ensuring the cleanliness and service life of the entire heat pump system.

[0068] Alternatively, if Figure 1 As shown, the liquid storage device 1 further includes: a first liquid inlet pipe 40 and a second liquid inlet pipe 50. The first end of the first liquid inlet pipe 40 is in communication with the hollow cavity of the buoyancy lifting structure 30, and the second end is used to communicate with the second heat exchanger 702, so that the refrigerant flowing through the second heat exchanger 702 flows into the hollow cavity of the buoyancy lifting structure 30, so that the hollow cavity stores fluid. The first end of the second liquid inlet pipe 50 is in communication with the first cavity 10, and the second end is used to communicate with the second heat exchanger 702; the second liquid inlet pipe 50 can be turned on or off to adjust the amount of fluid flowing into the first cavity 10, so as to control the moving position of the buoyancy lifting structure 30.

[0069] In the disclosed embodiment, part of the fluid flowing out of the second heat exchanger 702 flows into the hollow cavity of the buoyancy lifting structure 30 through the first liquid inlet pipe 40. Part of the fluid flowing out of the second heat exchanger 702 flows into the first cavity 10 as needed through the second liquid inlet pipe 50. At the same time, by opening or closing the second liquid inlet pipe 50, the amount of fluid flowing from the second heat exchanger 702 into the first cavity 10 can be accurately controlled, thereby controlling the moving height of the buoyancy lifting structure 30, and further controlling the amount of fluid flowing into the second cavity 20 in the buoyancy lifting structure 30.

[0070] It can be understood that in the heating condition of the heat pump unit 2, the first liquid inlet pipe 40 and the second liquid inlet pipe 50 can be turned on or off. Since the fluid of the heat pump unit 2 in the heating condition flows through the first heat exchanger 701, the liquid reservoir 1 and the second heat exchanger 702 in the order of flow, at this time, whether the first liquid inlet pipe 40 and the second liquid inlet pipe 50 are turned on or off, it is only necessary to make the liquid outlet of the buoyancy lifting structure 30 and the one-way guide hole 60 in a non-corresponding state, or to make sure that there is no fluid flow in the first liquid inlet pipe 40 and the second liquid inlet pipe 50, that is, there is no fluid in the first cavity 10. In the refrigeration condition of the heat pump unit 2, the first liquid inlet pipe 40 is turned on, so that the fluid flowing through the second heat exchanger 702 can flow into the hollow cavity. The second liquid inlet pipe 50 is turned on or off according to the fluid pressure of the first liquid inlet pipe 40 to control the amount of fluid flowing from the second heat exchanger 702 into the first cavity 10, so as to control the moving position of the buoyancy lifting structure 30.

[0071] Optionally, the second end of the second liquid inlet pipe 50 is connected to the first liquid inlet pipe 40. In this way, only the second end of the first liquid inlet pipe 40 needs to be connected to the second heat exchanger 702 to achieve the connection between the second heat exchanger 702 and the first cavity 10 and the hollow cavity.

[0072] The embodiment of the present disclosure provides a heat pump unit 2, which includes: a heat pump unit system 70 and a liquid storage device 1 for the heat pump unit as described above. The heat pump unit system 70 includes a first heat exchanger 701 located on the user side and a second heat exchanger 702 located on the air side. The second cavity 20 is connected to the first heat exchanger 701 and the second heat exchanger 702, respectively. The first cavity 10 is connected to the second heat exchanger 702 through the second liquid inlet pipe 50, and the hollow cavity of the buoyancy lifting structure 30 is connected to the second heat exchanger 702 through the first liquid inlet pipe 40. Among them, in the refrigeration condition, part of the fluid flowing through the second heat exchanger 702 flows into the first liquid inlet pipe 40, and the second liquid inlet pipe 50 is turned on or off according to the fluid pressure of the first liquid inlet pipe 40.

[0073] The fluid flowing through the heat pump unit 2 may be a refrigerant.

[0074] In this disclosed embodiment, by automatically controlling the storage and release of the circulating fluid in the heat pump unit 2, the problem of changes in the fluid circulation volume of the heat pump unit 2 under different operating conditions is effectively solved, and the heat pump unit 2 stores excess fluid through the liquid reservoir 1 in the heating mode and performs fluid self-regulation through the liquid reservoir 1 in the cooling mode, so as to respond in time to changes in the operating conditions of the heat pump unit 2 and improve the stability of the operation of the heat pump unit 2.

[0075] Alternatively, if Figures 2 to 5 As shown, the heat pump unit 2 further includes: a first refrigerant pipe 80 and a second refrigerant pipe 90. The first refrigerant pipe 80 is in communication with the first heat exchanger 701. The second refrigerant pipe 90 is in communication with the second heat exchanger 702. The first refrigerant pipe 80 and the second refrigerant pipe 90 both extend into the second cavity 20, and the length of the first refrigerant pipe 80 extending therein is greater than the length of the second refrigerant pipe 90 extending therein.

[0076] In this disclosed embodiment, since the amount of refrigerant injected into the same heat pump unit 2 is constant, the amount of refrigerant participating in the circulation during heating operation will be less than the amount of refrigerant participating in the circulation during cooling operation. Therefore, the length of the first refrigerant pipe 80 extending into the second cavity 20 is greater than the length of the second refrigerant pipe 90 extending into the second cavity 20. In this way, in the heating condition, the first refrigerant pipe 80 serves as the liquid inlet pipe and the second refrigerant pipe 90 serves as the liquid outlet pipe, so that the liquid outlet is less than the liquid inlet, so that the excess refrigerant in the heat pump unit 2 is stored in the liquid reservoir 1; in the cooling condition, the second refrigerant pipe 90 serves as the liquid inlet pipe and the first refrigerant pipe 80 serves as the liquid storage pipe, so that the amount of refrigerant participating in the circulation is large, and the refrigerant stored in the liquid reservoir 1 will also participate in the refrigeration cycle.

[0077] Alternatively, if Figures 2 to 5 As shown, the heat pump unit system 70 also includes a compressor 703 and a four-way valve 704. The compressor 703 is connected to the first heat exchanger 701 and the second heat exchanger 702 through the four-way valve 704, so that the heat pump unit 2 can switch the fluid flow direction in the cooling condition and the heating condition.

[0078] Alternatively, if Figures 2 to 5 As shown, the heat pump unit 2 further includes: a first throttling device 100 and a second throttling device 110. The first throttling device 100 is connected to the second refrigerant pipe 90. The first end of the second throttling device 110 is respectively connected to the first liquid inlet pipe 40 and the second liquid inlet pipe 50, and the second end is connected to the second heat exchanger 702. In this way, in the heating condition, the compressor 703 compresses the refrigerant and discharges high-temperature and high-pressure gas, which is condensed into medium-temperature and high-pressure refrigerant through the first heat exchanger 701. The medium-temperature and high-pressure refrigerant flows out through the liquid storage tank 1 and is throttled through the first throttling device 100 to flow out low-temperature and low-pressure refrigerant, which flows through the second heat exchanger 702 and returns to the compressor 703; in the cooling condition, the compressor 703 compresses the refrigerant and discharges high-temperature and high-pressure gas, which is condensed into medium-temperature and high-pressure refrigerant through the second heat exchanger 702, part of the medium-temperature and high-pressure refrigerant is throttled through the first throttling device 100 to flow out low-temperature and low-pressure refrigerant and flows into the second cavity 20, and part of it is throttled through the second throttling device 110 to flow out low-temperature and low-pressure refrigerant, part of which flows into the hollow cavity of the buoyancy lifting structure 30, and part of the low-temperature and low-pressure refrigerant flows into the interior of the first cavity 10 as needed. Therefore, by providing the first throttling device 100 and the second throttling device 110, the medium-temperature and high-pressure refrigerant is throttled to a low-temperature and low-pressure refrigerant to realize the refrigerant circulation of the heat pump unit 2. In addition, the first throttling device 100 and the second throttling device 110 are provided at the same time to prevent all the refrigerant flowing out of the second heat exchanger 702 from flowing into the unthrottled flow path.

[0079] For example, the second throttling device 110 may be a throttling capillary tube.

[0080] Alternatively, if Figure 5 As shown, the heat pump unit 2 further includes a control valve 120 and / or a flow valve 130. The control valve 120 is disposed on the second liquid inlet pipe 50 to control the conduction or cutoff of the second liquid inlet pipe 50. And / or, the flow valve 130 is disposed on the first liquid inlet pipe 40 to control the amount of fluid flowing into the buoyancy lifting structure 30.

[0081] For example, the control valve 120 may be a solenoid valve.

[0082] In the disclosed embodiment, the second liquid inlet pipe 50 is turned on or off by the control valve 120, thereby controlling the amount of refrigerant in the first cavity 10, and then controlling the moving height of the buoyancy lifting structure 30, so that the amount of refrigerant flowing from the cavity in the buoyancy lifting structure 30 into the second cavity 20 can be accurately controlled. By setting the flow valve 130, the amount of refrigerant entering the cavity in the buoyancy lifting structure 30 from the first liquid inlet pipe 40 can be adjusted.

[0083] Alternatively, if Figure 5 As shown, the heat pump unit 2 further includes a pressure sensor 140 , which is disposed on the first liquid inlet pipe 40 and is used to detect the fluid pressure of the first liquid inlet pipe 40 .

[0084] Optionally, the portion of the first liquid inlet pipe 40 in the first cavity 10 is a soft pipe, the length of which is greater than or equal to the height of the first cavity 10 and can be extended following the movement of the buoyancy lifting structure 30 .

[0085] Exemplarily, the distance between the lowest one-way flow guide hole 60 among the multiple one-way flow guide holes 60 and the bottom wall of the first cavity 10 is greater than the distance between the liquid outlet and the bottom wall of the first cavity 10 when the buoyancy lifting structure 30 is in the initial state. The buoyancy lifting structure 30 in the initial state means that the buoyancy lifting structure 30 is in the bottommost state in the first cavity 10.

[0086] Alternatively, if Figure 6 As shown, the heat pump unit 2 also includes a piston device 150. The piston device 150 is connected to a portion of the liquid inlet pipe between the control valve 120 and the first cavity 10 in the second liquid inlet pipe 50. The piston device 150 includes an upper cavity 1501, a lower cavity 1502 and a piston located between the upper and lower cavities, wherein the area sizes of the upper cavity 1501 and the lower cavity 1502 are adjusted by the up and down movement of the piston. The upper cavity 1501 is used to store fluid, and the lower cavity 1502 is provided with an air hole for injecting gas or exhausting gas to make the piston move up and down, so that the fluid in the upper cavity 1501 flows into the first cavity 10 or the fluid in the first cavity 10 flows into the upper cavity 1501.

[0087] It should be noted that initially, the lower chamber 1502 is filled with gas so that the piston is located at the uppermost end of the piston device 150. When the first chamber 10 is filled with fluid for the first time, the control valve 120 is closed, and the piston is pushed downward by discharging the gas in the lower chamber 1502 to suck the fluid in the first chamber 10 into the upper chamber 1501, so that the fluid in the first chamber 10 is partially or completely discharged; and / or, when the fluid needs to flow into the first chamber 10, if the upper chamber 1501 stores fluid, gas is injected into the lower chamber 1502 to control the piston to move upward, so that the fluid in the upper chamber 1501 flows into the first chamber 10. At this time, the control valve 120 can be opened or closed.

[0088] Exemplarily, when the fluid in the upper cavity 1501 flows into the first cavity 10, the control valve 120 is closed.

[0089] Alternatively, if Figure 6 As shown, the heat pump unit 2 further includes a valve body 160 , which is disposed between the piston device 150 and the second liquid inlet pipe 90 , and the pipeline between the piston device 150 and the first chamber 10 is opened or closed by opening or closing the valve body 160 .

[0090] Specifically, when the heat pump unit 2 is in the heating operation mode, the compressor 703 compresses the refrigerant and discharges high-temperature and high-pressure gas, which is condensed into medium-temperature and high-pressure refrigerant through the first heat exchanger 701. The medium-temperature and high-pressure refrigerant enters the second cavity 20 through the first refrigerant pipe 80. At this time, there is no refrigerant flowing out or in from the first cavity 10. The refrigerant participating in the heating operation flows out from the second refrigerant pipe 90, flows out as low-temperature and low-pressure refrigerant through the first throttling device 100, evaporates into low-temperature and low-pressure gas through the second heat exchanger 702, flows back to the compressor 703, and continues the heating cycle. The refrigerant not participating in the heating cycle will be stored in the liquid reservoir 1. In the heating operation mode, the liquid reservoir 1 has only the function of storing liquid.

[0091] Specifically, when the heat pump unit 2 is in the refrigeration operation mode, the compressor 703 compresses the refrigerant and discharges high-temperature and high-pressure gas, which is condensed into medium-temperature and high-pressure refrigerant through the second heat exchanger 702. A part of the medium-temperature and high-pressure refrigerant passes through the first throttling device 100, flows out as low-temperature and low-pressure refrigerant, and then passes through the second refrigerant pipe 90 into the second cavity 20. Another part is throttled by the second throttling device 110 and is divided into two paths. One path flows into the first cavity 10 of the liquid storage tank 1 as needed through the second liquid inlet pipe 50, and the other path flows into the hollow cavity of the buoyancy lifting structure 30 through the first liquid inlet pipe 40. The fluid pressure value of the first liquid inlet pipe 40 is detected by the pressure sensor 140, and the fluid pressure value is compared with the preset pressure value. If the fluid pressure value is higher than the preset pressure value, the control valve 120 performs a closing action. Since the distance between the lowest one-way flow guide hole 60 and the bottom wall of the first cavity 10 is greater than the distance between the liquid outlet and the bottom wall of the first cavity 10 when the buoyancy lifting structure 30 is in the initial state, when the buoyancy lifting structure 30 is at the bottom of the first cavity 10, it does not correspond to all the one-way flow guide holes 60. In this way, the refrigerant in the hollow cavity will not flow to the second cavity 20. Only the refrigerant in the second cavity 20 of the liquid storage device 1 flows out through the first refrigerant pipe 80 and enters the first heat exchanger 701 to participate in the refrigerant cycle of the heat pump unit 2. The refrigerant passes through the first heat exchanger 701 and is evaporated into a low-temperature and low-pressure gas, and flows back to the compressor 703 to continue the refrigeration cycle. If the fluid pressure value is lower than the preset pressure value, the control valve 120 performs an opening action, and part of the refrigerant in the medium-temperature and high-pressure refrigerant passes through the first refrigerant pipe 80. The second liquid inlet pipe 50 enters the first cavity 10, and the buoyancy lifting structure 30 moves upward. First, the liquid outlet of the buoyancy lifting structure 30 is tangent to the lowest one-way flow guide hole 60 among the multiple one-way flow guide holes 60, and then the lowest one-way flow guide hole 60 is opened. The refrigerant in the cavity of the buoyancy lifting structure 30 flows into the second cavity 20 through the lowest one-way flow guide hole 60. If the fluid pressure value is still lower than the preset pressure value at this time, the control valve 120 continues to perform the opening action, so that the buoyancy lifting structure 30 continues to Move upward so that the buoyancy lifting structure 30 is tangent to the previous one-way flow guide hole 60 of the currently corresponding one-way flow guide hole 60; then flow out through the first refrigerant pipe 80 and enter the first heat exchanger 701; that is, if the fluid pressure value continues to be lower than the preset pressure value, the buoyancy lifting structure 30 will continue to move upward to the position of the previous one-way flow guide hole 60 of the lowest one-way flow guide hole 60, and repeat the above process until the liquid outlet of the buoyancy lifting structure 30 is tangent to the uppermost one-way flow guide hole 60. If the liquid outlet of the buoyancy lifting structure 30 is already tangent to the uppermost one-way flow guide hole 60, and the fluid pressure value is still lower than the preset pressure value, the flow rate entering the hollow cavity through the first liquid inlet pipe 40 is increased through the flow valve 130 to increase the flow rate from the hollow cavity to the second cavity 20 until the fluid pressure value is equal to the preset pressure value.If the fluid pressure value is equal to the preset pressure value, the buoyancy lifting structure 30 stops at the current position, and the refrigerant no longer continues to enter the first cavity 10 through the second liquid inlet pipe 50 .

[0092] It should be noted that if the liquid outlet of the buoyancy lifting structure 30 is tangent to the uppermost one-way flow guide hole 60, and the fluid pressure value is higher than the preset pressure value, the valve body 160 is opened to conduct the pipeline between the first cavity 10 and the piston device 150, and the gas in the lower cavity 1502 of the piston device 150 is discharged to make the piston move downward, and the fluid in the first cavity 10 is sucked into the upper cavity 1501. Specifically, all the fluid in the first cavity 10 can be sucked into the upper cavity 1501.

[0093] When the fluid in the first cavity 10 flows into the upper cavity 1501 , the buoyancy lifting structure 30 descends. When all the fluid in the first cavity 10 is sucked into the upper cavity 1501 , the buoyancy lifting structure 30 descends to the bottom of the first cavity 10 .

[0094] It should be noted that if the fluid pressure value is lower than the preset pressure value, the control valve 120 can be controlled to continuously perform the opening action so that the fluid in the second heat exchanger 702 flows into the first cavity 10; or, when the fluid is stored in the upper cavity 1501 of the piston device 150, the valve body 160 can be opened to conduct the pipeline between the first cavity 10 and the piston device 150, and gas can be injected into the lower cavity 1502 of the piston device 150 so that the fluid in the upper cavity 1501 of the piston device 150 flows into the first cavity 10. Among them, the control valve 120 continuously performs the opening action, and the valve body 160 is opened to conduct the pipeline between the first cavity 10 and the piston device 150, and gas is injected into the lower cavity 1502 of the piston device 150 so that the fluid in the upper cavity 1501 of the piston device 150 flows into the first cavity 10, and these two can be performed simultaneously.

[0095] Among them, the preset pressure value is set according to actual needs.

[0096] In this disclosed embodiment, the preset pressure value is determined by the above-mentioned algorithm, so that the determination of the preset pressure value is more accurate, thereby more accurately controlling the conduction or cutoff of the second liquid inlet pipe 50, and then more accurately adjusting the amount of refrigerant participating in the refrigeration cycle of the heat pump unit 2 in the refrigeration condition, thereby improving the stability of the operation of the heat pump unit 2.

[0097] 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, logical, electrical, process, and other changes.

[0098] The embodiments are representative of possible variations only. Individual components and functions are optional unless explicitly required, and the order of operations may vary.

[0099] The parts and features of some embodiments may be included in or replace the parts and features of other embodiments. Moreover, the words used in this application are only used to describe the embodiments and are not used to limit the claims. As used in the description of the embodiments and claims, unless the context clearly indicates, the singular "a" (a), "an" (an) and "the" (the) are intended to include plural forms as well. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of listings that include one or more associated ones.

[0100] In addition, when used in this application, the term "comprise" and its variants "comprises" and / or comprising refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or groups thereof. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the presence of other identical elements in the process, method or device that includes the elements.

[0101] In this article, each embodiment may focus on the differences from other embodiments, and the same or similar parts between the embodiments may refer to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, then the relevant parts may refer to the description of the method part.

[0102] The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the 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 liquid storage device for a heat pump unit, characterized in that: include: The first cavity is used to communicate with the second heat exchanger located on the air side of the heat pump unit; A second cavity having a common first cavity wall with the first cavity; A plurality of one-way flow guide holes are arranged on the first cavity wall along the height direction to realize one-way conduction from the first cavity to the second cavity; the second cavity is used to communicate with the second heat exchanger located on the air side of the heat pump unit and the first heat exchanger located on the user side respectively; A buoyancy lifting structure, which has a hollow cavity inside and is provided with a liquid outlet communicated with the hollow cavity, the buoyancy lifting structure is movably arranged in the first cavity, and the liquid outlet corresponds to the vertical position of the one-way guide hole, and the hollow cavity is communicated with the second heat exchanger; When the fluid flowing through the second heat exchanger flows into the first cavity, the buoyancy lifting structure can float. At the same time, when the fluid flowing through the second heat exchanger flows into the hollow cavity of the buoyancy lifting structure, the buoyancy lifting structure can move in the first cavity under the buoyancy provided by the fluid inside the first cavity, and when the liquid outlet of the buoyancy lifting structure corresponds to the one-way guide hole, they can be tangent to each other and make the one-way guide hole one-way conductive so that the fluid in the buoyancy lifting structure flows to the second cavity, so as to adjust the amount of fluid in the second cavity.

2. The liquid storage device according to claim 1, characterized in that: The first cavity is cylindrical; the buoyancy lifting structure includes: The liquid level ball has a hollow cavity inside, and the outer wall of the liquid level ball is tangent to the inner wall of the first cavity.

3. The liquid storage device according to claim 1, characterized in that: A plurality of through holes are arranged on the first cavity wall along the height direction, and a one-way valve is arranged on each through hole to form a one-way flow guide hole to realize one-way conduction from the first cavity to the second cavity.

4. The liquid reservoir according to claim 1, characterized in that A ventilation structure is provided on the shell corresponding to the upper part of the first cavity.

5. The liquid storage device according to any one of claims 1 to 4, characterized in that: Also includes: A first liquid inlet pipe, a first end of which is in communication with the hollow cavity of the buoyancy lifting structure, and a second end of which is used to communicate with the second heat exchanger, so that the refrigerant flowing through the second heat exchanger flows into the hollow cavity of the buoyancy lifting structure, so that the hollow cavity stores fluid; The second liquid inlet pipe has a first end connected to the first cavity and a second end used to connect to the second heat exchanger; the second liquid inlet pipe can be opened or closed to adjust the amount of fluid flowing into the first cavity to control the moving position of the buoyancy lifting structure.

6. A heat pump unit, characterized in that: include: A heat pump unit system comprises a first heat exchanger located on the user side and a second heat exchanger located on the air side; and, A liquid storage device for a heat pump unit as described in any one of claims 1 to 5, wherein the second cavity is connected to the first heat exchanger and the second heat exchanger respectively; the first cavity is connected to the second heat exchanger through a second liquid inlet pipe, and the hollow cavity of the buoyancy lifting structure is connected to the second heat exchanger through a first liquid inlet pipe; wherein, in a refrigeration condition, part of the fluid flowing through the second heat exchanger flows into the first liquid inlet pipe, and the second liquid inlet pipe is turned on or off according to the fluid pressure of the first liquid inlet pipe.

7. The heat pump unit according to claim 6, characterized in that: Also includes: A first refrigerant pipe is connected to the first heat exchanger; A second refrigerant pipe is connected to the second heat exchanger; Wherein, the first refrigerant tube and the second refrigerant tube both extend into the second cavity, and the extending length of the first refrigerant tube is greater than the extending length of the second refrigerant tube.

8. The heat pump unit according to claim 7, characterized in that: Also includes: The first throttling device is connected to the second refrigerant pipe; The second throttling device has a first end which is respectively connected to the first liquid inlet pipe and the second liquid inlet pipe, and a second end which is connected to the second heat exchanger.

9. The heat pump unit according to claim 6, characterized in that: Also includes: A control valve is provided on the second liquid inlet pipe, and is used to control the second liquid inlet pipe to be turned on or off; and / or, The flow valve is arranged on the first liquid inlet pipe and is used to control the amount of fluid flowing into the buoyancy lifting structure.

10. The heat pump unit according to claim 9, characterized in that: Also includes: A piston device is connected to a portion of the second liquid inlet pipe between the control valve and the first cavity, and comprises an upper cavity, a lower cavity and a piston located between the upper and lower cavities; The area sizes of the upper cavity and the lower cavity are adjusted by the up and down movement of the piston; the upper cavity is used to store fluid, and the lower cavity is provided with air holes, which are used to inject gas or discharge gas to make the piston move up and down, so that the fluid in the upper cavity flows into the first cavity or the fluid in the first cavity flows into the upper cavity.

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