Heat pump system capable of delaying frosting and improving enthalpy spraying efficiency

Abstract

The utility model relates to the technical field of heat pumps, in particular to a heat pump system capable of delaying frosting and improving enthalpy spraying efficiency. The four-way valve is provided with a first control port, a second control port, a third control port and a fourth control port, the first control port and the second control port are communicated with each other, the third control port and the fourth control port are communicated with each other, the first control port is communicated with a first port of the compressor, and the fourth control port is communicated with a second port of the compressor; the condenser is communicated with the second control port, and the condenser is provided with a water inlet and a water outlet; the water inlet end of the proportional-integral valve is communicated with the water outlet, and the water outlet end of the proportional-integral valve is communicated with the water inlet; the evaporator is communicated with the condenser and the third control port; the first temperature sensor is electrically connected with the proportional-integral valve and used for collecting the environment temperature; and the second temperature sensor is electrically connected with the proportional-integral valve. The defrosting speed of the evaporator can be slowed down, and efficient operation of a heat pump system is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pumps, in particular to a heat pump system capable of delaying frosting and improving spray enthalpy efficiency. Background Art

[0002] During the initial commissioning phase of a heat pump system, especially in winter, the water temperature is relatively low. Due to the unit's low condensing temperature, the cooling capacity is relatively high, increasing the heat exchange temperature difference across the evaporator and making the heat pump system's evaporator more susceptible to frost. Heat pump systems with larger water tanks, in particular, will experience frequent defrosting, preventing the water temperature from rising normally.

[0003] Therefore, a heat pump system that delays frosting and improves spray enthalpy efficiency is needed to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a heat pump system that delays frosting and improves spray enthalpy efficiency, which can delay the speed of frosting on the evaporator and ensure the efficient operation of the heat pump system that delays frosting and improves spray enthalpy efficiency.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] The heat pump system for delaying frosting and improving spray enthalpy efficiency includes:

[0007] compressor;

[0008] a four-way valve, the four-way valve having a first control port and a second control port that are interconnected, and a third control port and a fourth control port that are interconnected, the first control port being connected to the first port of the compressor, and the fourth control port being connected to the second port of the compressor;

[0009] a condenser, the condenser being in communication with the second control port, the condenser having a water inlet and a water outlet;

[0010] a proportional-integral valve, wherein a water inlet of the proportional-integral valve is connected to the water outlet, and a water outlet of the proportional-integral valve is connected to the water inlet;

[0011] an evaporator, the evaporator being in communication with the condenser and the third control port, and a first expansion valve being connected in series between the condenser and the evaporator;

[0012] a first temperature sensor, electrically connected to the proportional-integral valve, for collecting ambient temperature;

[0013] A second temperature sensor is electrically connected to the proportional-integral valve and is disposed at the inlet of the evaporator. The first temperature sensor and the second temperature sensor can adjust the opening of the proportional-integral valve.

[0014] In some embodiments, a liquid reservoir is further included, and the liquid reservoir is arranged in series between the first expansion valve and the condenser.

[0015] In some embodiments, a liquid-gas separator is provided in series between the fourth control port and the second port of the compressor.

[0016] In some embodiments, the evaporator is a finned evaporator.

[0017] In some embodiments, an economizer and an auxiliary circuit are further included. The economizer is arranged in series between the condenser and the evaporator. One end of the auxiliary circuit is connected to the first expansion valve, and the other end of the auxiliary circuit is connected to the first economizer port. The second economizer port is connected to the air inlet end of the compressor.

[0018] In some embodiments, a second expansion valve is provided in series on the auxiliary circuit.

[0019] In some embodiments, a third temperature sensor is further included. The third temperature sensor is disposed at the inlet of the economizer and is electrically connected to the proportional-integral valve.

[0020] In some embodiments, a fourth temperature sensor is further included. The fourth temperature sensor is disposed at the outlet of the economizer and is electrically connected to the proportional-integral valve.

[0021] In some embodiments, a controller is provided on the proportional-integral valve, and the controller is electrically connected to the proportional-integral valve, the first temperature sensor, the second temperature sensor, the third temperature sensor and the fourth temperature sensor, and the controller can adjust the opening of the proportional-integral valve.

[0022] In some embodiments, a fifth temperature sensor is further included, and the fifth temperature sensor is disposed at the water inlet of the condenser.

[0023] Beneficial effects of the utility model:

[0024] The utility model provides a heat pump system for delaying frosting and improving spray enthalpy efficiency. The compressor is connected to the first control port and the fourth control port of the four-way valve. The condenser, the first expansion valve, and the evaporator are connected in series with the compressor to form a circulation system. The condenser is connected to the second control port, and the evaporator is connected to the third control port. A proportional integral valve is provided between the water inlet and the water outlet of the condenser. A first temperature sensor for measuring the ambient temperature and a second temperature sensor for collecting the evaporator inlet temperature are both electrically connected to the proportional integral valve. During the debugging process of the heat pump system, the opening of the proportional integral valve is controlled by the ambient temperature collected by the first temperature sensor and the second temperature sensor and the evaporator inlet temperature, so that part of the condenser outlet water enters directly through the water inlet, thereby adjusting the water volume of the condenser, indirectly raising the condensation temperature, slowing the frosting speed of the heat exchanger, and ensuring the efficient operation of the heat pump system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0026] Figure 1 This is a schematic diagram of a heat pump system for delaying frosting and improving spray enthalpy efficiency according to the utility model.

[0027] In the picture:

[0028] 1. Compressor; 2. Four-way valve; 3. Condenser; 31. Fifth temperature sensor; 4. Proportional-integral valve; 5. Liquid reservoir; 6. Economizer; 61. Third temperature sensor; 62. Fourth temperature sensor; 63. Auxiliary circuit; 64. Second expansion valve; 7. First expansion valve; 8. Evaporator; 81. Second temperature sensor; 9. Liquid-gas separator. DETAILED DESCRIPTION

[0029] Before any embodiments of the present application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the foregoing drawings.

[0030] In this application, the terms "comprises," "includes," "has," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0031] In this application, the terms "connect," "combine," "couple," and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without an intermediary, and an indirect connection refers to two parts or components being connected to at least one intermediary, with the two parts or components being connected via the intermediary. Furthermore, "connect" and "couple" are not limited to physical or mechanical connections or couplings and may include electrical connections or couplings.

[0032] In this application, it will be understood by those skilled in the art that the function performed by an assembly can be performed by one assembly, multiple assemblies, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one assembly, or a combination of multiple parts.

[0033] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to the other element "upper" or "lower", but also be indirectly connected to the other element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, below can include directly below, lower left, lower right, lower front and lower back, etc.

[0034] During the commissioning of the heat pump system, in order to slow down the frost formation of the evaporator and ensure the efficient operation of the heat pump system, Figure 1 As shown, the present invention provides a heat pump system for delaying frosting and improving spray enthalpy efficiency. The heat pump system includes a compressor 1, a four-way valve 2, a condenser 3, a proportional integral valve 4, an evaporator 8, a first temperature sensor, and a second temperature sensor 81.

[0035] Among them, the four-way valve 2 has a first control port and a second control port that are interconnected, as well as a third control port and a fourth control port that are interconnected. The first control port is connected to the first port of the compressor 1, and the fourth control port is connected to the second port of the compressor 1. The condenser 3 is connected to the second control port and has a water inlet and a water outlet. The water inlet end of the proportional-integral valve 4 is connected to the water outlet, and the water outlet end of the proportional-integral valve 4 is connected to the water inlet. The evaporator 8 is connected to the condenser 3 and the third control port, and a first expansion valve 7 is connected in series between the condenser 3 and the evaporator 8. A first temperature sensor is electrically connected to the proportional-integral valve 4 for collecting ambient temperature. A second temperature sensor 81 is electrically connected to the proportional-integral valve 4 and is disposed at the inlet of the evaporator 8. The first and second temperature sensors 81 can adjust the opening of the proportional-integral valve 4.

[0036] During the debugging process of the heat pump system for delaying frosting and improving spray enthalpy efficiency, the opening of the proportional integral valve 4 is controlled by the ambient temperature collected by the first temperature sensor and the second temperature sensor 81 and the inlet temperature of the evaporator 8, so that part of the outlet water of the condenser 3 enters directly through the water inlet, thereby adjusting the water volume of the condenser 3, indirectly increasing the condensing temperature, slowing down the frosting speed of the heat exchanger, and ensuring the efficient operation of the heat pump system for delaying frosting and improving spray enthalpy efficiency.

[0037] In some embodiments, the heat pump system for delaying frosting and improving spray enthalpy efficiency further includes a liquid reservoir 5, which is arranged in series between the first expansion valve 7 and the condenser 3. The provision of the liquid reservoir 5 can slow down the circulation rate of the liquid medium, further cooling the liquid medium in the liquid reservoir 5. At the same time, the gaseous medium in the liquid medium is further cooled and converted into liquid, thereby facilitating subsequent liquid extraction by the first expansion valve 7.

[0038] In some embodiments, a liquid-gas separator 9 is provided in series between the fourth control port and the second port of the compressor 1. By providing the liquid-gas separator 9, the medium entering the compressor 1 through the fourth control port of the four-way valve 2 can be separated into gas and liquid, ensuring that the compressor 1 can operate efficiently.

[0039] In some embodiments, the evaporator 8 is a finned evaporator. By using a finned evaporator, the contact area with the air is increased, so that when heating, the heat in the environment can be fully absorbed; when cooling, the heat can be quickly dissipated through the fins of the evaporator 8.

[0040] In some embodiments, the heat pump system for delaying frosting and improving spray enthalpy efficiency further includes an economizer 6 and an auxiliary loop 63. The economizer 6 is arranged in series between the condenser 3 and the evaporator 8. One end of the auxiliary loop 63 is connected to the first expansion valve 7, and the other end of the auxiliary loop 63 is connected to the first economizer port of the economizer 6. The second economizer port of the economizer 6 is connected to the air intake of the compressor 1. By providing the economizer 6 and the auxiliary loop 63, the auxiliary loop 63 is used to obtain a portion of the cooled liquid medium and enter the economizer 6. The liquid medium circulating in the economizer 6 is used to heat the returning liquid medium, thereby causing the returning liquid medium to vaporize and directly enter the compressor 1 for compression. Through the above arrangement, the economic efficiency of the heat pump system can be improved.

[0041] In some embodiments, a second expansion valve 64 is provided in series with the auxiliary circuit 63. By providing the auxiliary expansion valve, the liquid medium can be converted into a low-temperature, low-pressure state of a mixture of liquid and gas, so that the temperature of the liquid medium passing through the economizer 6 can be used for subsequent vaporization.

[0042] In some embodiments, the heat pump system for delaying frosting and improving spray enthalpy efficiency further includes a third temperature sensor 61, which is disposed at the inlet of the economizer 6 and is electrically connected to the proportional-integral valve 4. The third temperature sensor 61 enables real-time detection of the inlet temperature of the economizer 6.

[0043] In some embodiments, the heat pump system for delaying frosting and improving spray enthalpy efficiency further includes a fourth temperature sensor 62, which is disposed at the outlet of the economizer 6 and electrically connected to the proportional-integral valve 4. The fourth temperature sensor 62 enables real-time monitoring of the outlet temperature of the economizer 6. The third and fourth temperature sensors 61, 62 collect the inlet and outlet temperatures of the economizer 6 to determine the heat pump system's spray efficiency at that time. The spray efficiency can then be optimized by adjusting the opening of the proportional-integral valve 4.

[0044] In some embodiments, a controller is provided on the proportional-integral valve 4. The controller is electrically connected to the proportional-integral valve 4, the first temperature sensor, the second temperature sensor 81, the third temperature sensor 61, and the fourth temperature sensor 62. The controller is capable of adjusting the opening of the proportional-integral valve 4. The controller processes data collected by the first and second temperature sensors 81, thereby determining whether frost is forming too quickly based on the difference between the ambient temperature and the inlet temperature of the evaporator 8. If frost formation is too rapid, causing the heat pump system's heating capacity to decline significantly, the controller adjusts the proportional-integral valve 4 to adjust the water volume in the condenser 3, indirectly raising the condensing temperature and slowing the frost formation on the finned heat exchanger. After the heat pump system starts up normally, the controller analyzes the inlet and outlet temperature difference of the economizer 6 to determine the current air injection effect and adjusts the proportional-integral valve 4 to optimize the air injection effect. In this embodiment, the controller can be a single-chip microcomputer or a programmable logic controller (PLC). The controller's data analysis and control are standard practices in the industry, and the controller's operating principles will not be elaborated upon here.

[0045] In some embodiments, the heat pump system for delaying frosting and improving spray enthalpy efficiency further includes a fifth temperature sensor 31, which is disposed at the water inlet of the condenser 3. By providing the fifth temperature sensor 31, the water inlet temperature of the condenser 3 can be detected in real time.

[0046] The working process of the heat pump system for delaying frosting and improving spray enthalpy efficiency is as follows:

[0047] After the heat pump system is powered on for the first time, the inlet water temperature is detected. When the inlet water temperature collected by the fifth temperature sensor 31 is ≤35°C, the unit enters the delayed frost mode. In this mode, the unit is controlled as follows:

[0048] When the heat pump system receives a start-up command, the proportional-integral valve sets its opening according to the inlet water temperature-proportional-integral valve opening ratio comparison table based on the inlet water temperature.

[0049]

[0050] After the heat pump system has been operating normally for 5 minutes, the difference between the ambient temperature and the evaporator 8 inlet temperature is recorded to obtain the ring fin temperature difference. At this time, the current ring fin temperature difference is recorded every 10 minutes, and the average change rate of the ring fin temperature difference is calculated.

[0051] In each defrost cycle, a frost status judgment is performed and an action is executed according to the judgment result.

[0052] 1. If the increment of the annular wing temperature difference is ≥30% in 10 minutes, or if the increment of the annular wing temperature difference is ≥40% in 20 minutes, or if the increment of the annular wing temperature difference is ≥50% in 30 minutes, it is determined that the frost is very likely to form. At this time, the proportional integral valve 4 is increased by 40% at the current opening.

[0053] 2. If the increment of the annular wing temperature difference is ≥20% in 10 minutes; or if the increment of the annular wing temperature difference is ≥30% in 20 minutes; or if the increment of the annular wing temperature difference is ≥40% in 30 minutes, it is determined that it is in a frosting-prone state. At this time, the proportional integral valve 4 increases by 20% at the current proportional opening.

[0054] 3. If the increment of the annular wing temperature difference is ≥10% in 10 minutes, or if the increment of the annular wing temperature difference is ≥20% in 20 minutes, or if the increment of the annular wing temperature difference is ≥30% in 30 minutes, it is determined that it is in a normal frosting state, and the proportional-integral valve 4 remains unchanged at the current proportional opening.

[0055] 4. If the increment of the annular wing temperature difference is less than 10% in 10 minutes, or if the increment of the annular wing temperature difference is less than 20% in 20 minutes, or if the increment of the annular wing temperature difference is less than 30% in 30 minutes, it is determined that the frost is less than frost at this time. At this time, the proportional integral valve 4 is closed by 10% at the current proportional opening.

[0056] 5. If the increment of the annular wing temperature difference is less than 5% after 10 minutes, or less than 10% after 20 minutes, or less than 20% after 30 minutes, it is determined that there is minimal frost. At this time, the proportional-integral valve 4 is closed by 20% at the current proportional opening. In this way, the actual frost situation can be fed back through the annular wing temperature difference, and the opening of the proportional-integral valve 4 can be adjusted according to the frost situation, thereby achieving the effect of delaying frost formation.

[0057] When the heat pump system is in the normal frosting, less frosting, and very little frosting state, it enters the high-efficiency control stage.

[0058] At this time, the third temperature sensor 61 and the fourth temperature sensor 62 detect the inlet and outlet temperature difference of the economizer 6, and the proportional integral valve 4 is controlled according to the economizer inlet and outlet temperature difference-proportional integral valve opening adjustment comparison table.

[0059]

[0060] The inlet and outlet temperature difference of economizer 6 is monitored every minute, and the current ratio is adjusted according to the above comparison table. The adjustment ratio is calculated as a percentage of the total ratio. This method can provide feedback on the effect of the heat pump system's air injection enthalpy increase through the inlet and outlet temperature difference of economizer 6. Based on this effect, the opening of proportional-integral valve 4 is adjusted in real time, thereby improving the efficiency of air injection enthalpy increase and enhancing unit performance.

[0061] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A heat pump system for delaying frosting and improving spray enthalpy efficiency, characterized in that: include: compressor (1); a four-way valve (2), the four-way valve (2) having a first control port and a second control port that are in communication with each other, and a third control port and a fourth control port that are in communication with each other, the first control port being in communication with the first port of the compressor (1), and the fourth control port being in communication with the second port of the compressor (1); a condenser (3), the condenser (3) being in communication with the second control port, the condenser (3) having a water inlet and a water outlet; A proportional integral valve (4), wherein the water inlet end of the proportional integral valve (4) is connected to the water outlet, and the water outlet end of the proportional integral valve (4) is connected to the water inlet; an evaporator (8), the evaporator (8) being in communication with the condenser (3) and the third control port, and a first expansion valve (7) being connected in series between the condenser (3) and the evaporator (8); a first temperature sensor electrically connected to the proportional integral valve (4) and used for collecting ambient temperature; A second temperature sensor (81) is electrically connected to the proportional-integral valve (4), and the second temperature sensor (81) is arranged at the inlet of the evaporator (8). The first temperature sensor and the second temperature sensor (81) are capable of adjusting the opening of the proportional-integral valve (4).

2. The heat pump system for delaying frosting and improving spray enthalpy efficiency according to claim 1, characterized in that: It also includes a liquid accumulator (5), which is arranged in series between the first expansion valve (7) and the condenser (3).

3. The heat pump system for delaying frosting and improving spray enthalpy efficiency according to claim 1, characterized in that: A liquid-gas separator (9) is provided in series between the fourth control port and the second port of the compressor (1).

4. The heat pump system for delaying frosting and improving spray enthalpy efficiency according to claim 1, characterized in that: The evaporator (8) is a fin evaporator.

5. The heat pump system for delaying frosting and improving spray enthalpy efficiency according to claim 1, characterized in that: The system further comprises an economizer (6) and an auxiliary circuit (63), wherein the economizer (6) is arranged in series between the condenser (3) and the evaporator (8), one end of the auxiliary circuit (63) is connected to the first expansion valve (7), the other end of the auxiliary circuit (63) is connected to the first economizer port of the economizer (6), and the second economizer port of the economizer (6) is connected to the air inlet end of the compressor (1).

6. The heat pump system for delaying frosting and improving spray enthalpy efficiency according to claim 5, characterized in that: A second expansion valve (64) is provided in series on the auxiliary circuit (63).

7. The heat pump system for delaying frosting and improving spray enthalpy efficiency according to claim 6, characterized in that: The system further comprises a third temperature sensor (61), which is arranged at the inlet of the economizer (6) and is electrically connected to the proportional-integral valve (4).

8. The heat pump system for delaying frosting and improving spray enthalpy efficiency according to claim 7, characterized in that: The system further comprises a fourth temperature sensor (62), which is arranged at the outlet of the economizer (6) and is electrically connected to the proportional-integral valve (4).

9. The heat pump system for delaying frosting and improving spray enthalpy efficiency according to claim 8, characterized in that: The proportional-integral valve (4) is provided with a controller, the controller being electrically connected to the proportional-integral valve (4), the first temperature sensor, the second temperature sensor (81), the third temperature sensor (61) and the fourth temperature sensor (62), and the controller being capable of adjusting the opening of the proportional-integral valve (4).

10. The heat pump system for delaying frosting and improving spray enthalpy efficiency according to claim 1, characterized in that: It also includes a fifth temperature sensor (31), which is arranged at the water inlet of the condenser (3).

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