Low-temperature variable-frequency direct-heating compartment type all-in-one machine

Abstract

The utility model relates to the technical field of heat pumps, in particular to a low-temperature type variable-frequency direct-heating compartment type all-in-one machine which comprises a shell, a heat insulation plate is arranged in the shell and divides the interior of the shell into a first cavity, a second cavity and a third cavity, a first heat pump device is arranged in the first cavity, a second heat pump device is arranged in the second cavity, and the third cavity is communicated with the first heat pump device. A heat storage device is arranged in the third cavity; the first heat pump device is used for transferring heat in a low-frequency working state; the second heat pump device is used for transferring heat in a high-frequency working state; the heat storage device is connected with the first heat pump device and the second heat pump device and used for collecting and storing heat. The energy consumption can be reduced, and the heating efficiency can be improved.

Description

Technical Field

[0001] This utility model relates to the field of heat pump technology, and in particular to a low-temperature variable frequency direct heating box-type integrated heat pump. Background Technology

[0002] A heat pump is a highly efficient and energy-saving device that fully utilizes low-grade heat energy. Heat can spontaneously transfer from a high-temperature object to a low-temperature object, but not spontaneously in the opposite direction. The working principle of a heat pump is a mechanical device that forces heat to flow from a low-temperature object to a high-temperature object in a reverse circulation manner. It consumes only a small amount of net reverse circulation work to obtain a large amount of heat supply, effectively utilizing low-grade heat energy that is difficult to apply, thus achieving energy-saving goals.

[0003] The drop in outdoor temperature in winter reduces the amount of heat absorbed by the refrigerant in the evaporator of the heat pump system from the outdoor air. At the same time, the evaporation pressure decreases, the intake air volume decreases, and the heating capacity and operating power decrease. Furthermore, the drop in outdoor temperature in winter will reduce the efficiency of the compressor in the heat pump system, and the evaporation temperature and evaporation pressure will also decrease. Meanwhile, the condensation pressure is constrained by the medium (indoor air, water) and does not change much. This will inevitably lead to an increase in the compression ratio. The increase in the compression ratio will reduce the efficiency of the compressor during operation, resulting in insufficient heat pump output and a sharp drop in the energy efficiency ratio.

[0004] Chinese Patent Publication No. CN104748442B discloses an air source heat pump device, comprising: a compressor and a four-way valve, a condenser, a liquid storage tank, a third thermal expansion valve, and an evaporator connected in sequence. The evaporator is connected to the four-way valve and a gas-liquid separator before being connected to the compressor. The condenser is provided with a cold water inlet and a high-temperature water outlet. A gas supply structure is provided between the evaporator and the liquid storage tank. The device also includes: several stages of intermediate gas supply and enthalpy-increasing structures for supplementing the intermediate cavity of the compressor with medium-pressure gas, which are located between the liquid storage tank and the compressor. Therefore, this invention has the following problems: high energy consumption and limited heating efficiency during low-temperature operation. Utility Model Content

[0005] Therefore, this utility model provides a low-temperature variable frequency direct heating box-type integrated unit to overcome the problems of high energy consumption and limited heating efficiency in the prior art when operating at low temperatures.

[0006] To achieve the above objectives, this utility model provides a low-temperature variable frequency direct heating box-type integrated machine, including a shell, with a heat insulation plate inside the shell dividing the interior of the shell into a first cavity, a second cavity, and a third cavity. The first cavity is equipped with a first heat pump device, the second cavity is equipped with a second heat pump device, and the third cavity is equipped with a heat storage device.

[0007] The first heat pump device is used to transfer heat in a low-frequency operating state;

[0008] The second heat pump device is used to transfer heat in a high-frequency operating state;

[0009] The heat storage device is connected to the first heat pump device and the second heat pump device respectively, for collecting and storing heat.

[0010] Furthermore, the first heat pump device includes a first evaporation mechanism, a low-frequency compression mechanism, a first condensation mechanism, and a first throttling mechanism;

[0011] The first evaporation mechanism is connected to the heat storage device to absorb heat from the outside and / or the heat storage device to vaporize the first low-pressure liquid to obtain the first low-pressure gas.

[0012] The low-frequency compression mechanism is connected to the evaporation mechanism to perform low-frequency heating and pressurization of the first low-pressure gas to obtain the first high-pressure gas.

[0013] The first condensation mechanism is connected to the low-frequency compression mechanism and the heat storage device respectively, and is used to liquefy the first high-pressure gas to obtain the first medium-pressure liquid, and release heat to the outside and the heat storage device.

[0014] The first throttling mechanism is connected to the first condensing mechanism and the evaporating mechanism respectively, so as to convert the first medium-pressure liquid into a first low-pressure liquid through throttling and transfer it to the first evaporating mechanism.

[0015] Furthermore, the second heat pump device includes a second evaporation mechanism, a high-frequency compression mechanism, a second condensation mechanism, and a second throttling mechanism;

[0016] The second evaporation mechanism is connected to the heat storage device to absorb heat from the outside and / or the heat storage device to vaporize the second low-pressure liquid to obtain the second low-pressure gas.

[0017] The high-frequency compression mechanism is connected to the evaporation mechanism to perform high-frequency heating and pressurization of the second low-pressure gas to obtain a second high-pressure gas.

[0018] The second condensation mechanism is connected to the high-frequency compression mechanism and the heat storage device respectively, and is used to liquefy the second high-pressure gas to obtain the second medium-pressure liquid, and release heat to the outside and the heat storage device.

[0019] The second throttling mechanism is connected to the second condensing mechanism and the evaporating mechanism respectively, so as to convert the second medium-pressure liquid into a second low-pressure liquid through throttling and transfer it to the second evaporating mechanism.

[0020] Furthermore, a first heat-absorbing fan is provided on the outer wall of the housing at a position corresponding to the first evaporation mechanism. The first heat-absorbing fan is connected to the first evaporation mechanism to deliver external heat to the first evaporation mechanism.

[0021] Furthermore, a second heat-absorbing fan is provided on the outer wall of the housing at a position corresponding to the second evaporation mechanism. The second heat-absorbing fan is connected to the second evaporation mechanism to deliver external heat to the second evaporation mechanism.

[0022] Furthermore, the sidewall of the housing is provided with a plurality of heat dissipation through holes at positions corresponding to the first condensation mechanism / second condensation mechanism.

[0023] Furthermore, the heat storage device includes a heat collection unit and a heat storage unit;

[0024] The heat collection unit is connected to the first condensing mechanism and the second condensing mechanism respectively, and is used to collect the heat released by the first condensing mechanism / the second condensing mechanism;

[0025] The heat storage unit is connected to the heat collection unit and is used to store the heat collected by the heat collection unit.

[0026] Furthermore, the first heat pump device further includes a first heat transfer mechanism, and the second heat pump device further includes a second heat transfer mechanism.

[0027] The first heat transfer mechanism is connected to the first condensation mechanism and the heat storage device at both ends, respectively, to transfer part of the heat released by the first condensation mechanism to the heat storage device.

[0028] The second heat transfer mechanism is connected at both ends to the second condensation mechanism and the heat storage device, respectively, so as to transfer part of the heat released by the second condensation mechanism to the heat storage device.

[0029] Furthermore, both the first throttling mechanism and the second throttling mechanism are expansion valves.

[0030] Furthermore, the heat storage unit includes a liquid storage tank, which contains a heat-conducting liquid.

[0031] Compared with existing technologies, the advantages of this invention are as follows: This invention uses a heat insulation plate to divide the interior of the shell into three cavities, separating the first heat pump device, the second heat pump device, and the heat storage device, thus preventing heat loss. By setting the first and second heat pump devices to transfer heat in low-frequency and high-frequency operating states respectively, energy consumption can be reduced and heating efficiency improved. The heat storage device can collect and store excess heat, thereby improving heat utilization and reducing energy consumption.

[0032] Furthermore, the first heat pump device of this utility model is equipped with a first evaporation mechanism, a low-frequency compression mechanism, a first condensation mechanism, and a first throttling mechanism, which can transfer heat in a low-frequency operating state, thereby reducing energy consumption and saving costs.

[0033] Furthermore, the second heat pump device of this utility model is equipped with a second evaporation mechanism, a high-frequency compression mechanism, a second condensation mechanism, and a second throttling mechanism, which can transfer heat in a high-frequency operating state and improve heating efficiency.

[0034] Furthermore, this utility model is equipped with a first heat-absorbing fan and a second heat-absorbing fan, which can transfer external heat to the first evaporation mechanism and the second evaporation mechanism, thereby improving the heating efficiency of the first heat pump device and the second heat pump device.

[0035] Furthermore, the side wall of the housing of this utility model is provided with several heat dissipation holes at corresponding positions of the first condensation mechanism / second condensation mechanism, which can improve heat transfer efficiency and avoid heat loss.

[0036] Furthermore, the heat storage device of this utility model is equipped with a heat collection unit and a heat storage unit, which can collect and store the excess heat of the first condensing mechanism and the second condensing mechanism, and transfer it to the first evaporating mechanism and the second evaporating mechanism, thereby improving the heat collection efficiency, reducing energy consumption, and reducing heat loss.

[0037] Furthermore, this utility model is equipped with a first heat transfer mechanism and a second heat transfer mechanism, which can transfer excess heat to the heat storage device, thereby improving heat transfer efficiency and avoiding heat loss.

[0038] Furthermore, the heat storage unit of this utility model is equipped with a liquid storage tank for heat storage, which can reduce energy consumption and save costs. Attached Figure Description

[0039] Figure 1 This is an internal structural diagram of the low-temperature variable frequency direct heating integrated box-type unit according to an embodiment of the present utility model;

[0040] Figure 2 This is a front structural diagram of an embodiment of the present utility model;

[0041] Figure 3 This is a schematic diagram of the rear structure of an embodiment of the present utility model;

[0042] Figure 4 This is a schematic diagram of the heat pump device in the first embodiment of the present invention for transferring heat;

[0043] Figure 5 This is a schematic diagram of the heat transfer structure of the second heat pump device according to an embodiment of the present invention;

[0044] In the diagram: 1. Shell; 2. First cavity; 3. Second cavity; 4. Third cavity; 5. First heat pump device; 6. Second heat pump device; 7. Insulation plate; 8. Heat storage device; 11. Heat dissipation hole; 51. First evaporation mechanism; 52. Low-frequency compressor; 53. First condensation mechanism; 54. First throttling mechanism; 55. First heat absorption fan; 56. First heat transfer mechanism; 61. Second evaporation mechanism; 62. High-frequency compressor; 63. Second condensation mechanism; 64. Second throttling mechanism; 65. Second heat absorption fan; 66. Second heat transfer mechanism. Detailed Implementation

[0045] To make the objectives and advantages of this utility model clearer, the utility model will be further described below with reference to the embodiments; it should be understood that the specific embodiments described herein are merely for explaining this utility model and are not intended to limit this utility model.

[0046] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0047] It should be noted that in the description of this utility model, the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0048] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0049] Please see Figures 1-5 As shown, Figure 1 This is an internal structural diagram of the low-temperature variable frequency direct heating integrated box-type unit according to an embodiment of the present utility model; Figure 2 This is a front structural diagram of an embodiment of the present utility model; Figure 3 This is a schematic diagram of the rear structure of an embodiment of the present utility model; Figure 4 This is a schematic diagram of the heat pump device in the first embodiment of the present invention for transferring heat; Figure 5This is a schematic diagram of the heat transfer structure of the second heat pump device according to an embodiment of the present invention; in the figure: shell 1, first cavity 2, second cavity 3, third cavity 4, first heat pump device 5, second heat pump device 6, heat insulation plate 7, heat storage device 8, heat dissipation hole 11, first evaporation mechanism 51, low frequency compressor 52, first condensation mechanism 53, first throttling mechanism 54, first heat absorption fan 55, first heat transfer mechanism 56, second evaporation mechanism 61, high frequency compressor 62, second condensation mechanism 63, second throttling mechanism 64, second heat absorption fan 65, second heat transfer mechanism 66.

[0050] This utility model embodiment provides a low-temperature variable frequency direct heating box-type integrated machine, including a shell 1. The shell 1 is provided with a heat insulation plate 7, which divides the interior of the shell 1 into a first cavity 2, a second cavity 3 and a third cavity 4. The first cavity 2 is provided with a first heat pump device 5, the second cavity 3 is provided with a second heat pump device 6, and the third cavity 4 is provided with a heat storage device 8.

[0051] The first heat pump device 5 is used to transfer heat in a low-frequency operating state;

[0052] The second heat pump device 6 is used to transfer heat in a high-frequency operating state;

[0053] The heat storage device 8 is connected to the first heat pump device 5 and the second heat pump device 6 respectively, for collecting and storing heat.

[0054] This invention uses a heat insulation plate 7 to divide the interior of the shell 1 into three cavities, separating the first heat pump device 5, the second heat pump device 6, and the heat storage device 8. This prevents heat loss. By setting the first heat pump device 5 and the second heat pump device 6 to transfer heat in low-frequency and high-frequency operating states respectively, energy consumption can be reduced and heating efficiency can be improved. The heat storage device 8 can collect and store excess heat, thereby improving heat utilization and reducing energy consumption.

[0055] Specifically, the first heat pump device 5 includes a first evaporation mechanism 51, a low-frequency compressor 52, a first condensation mechanism 53, and a first throttling mechanism 54;

[0056] The first evaporation mechanism 51 is connected to the heat storage device 8 to absorb heat from the outside and / or the heat storage device 8 to vaporize the first low-pressure liquid to obtain the first low-pressure gas.

[0057] The low-frequency compressor 52 is connected to the evaporation mechanism to perform low-frequency heating and pressurization of the first low-pressure gas to obtain the first high-pressure gas.

[0058] The first condensing mechanism 53 is connected to the low-frequency compressor 52 and the heat storage device 8 respectively, and is used to liquefy the first high-pressure gas to obtain the first medium-pressure liquid, and release heat to the outside and the heat storage device 8.

[0059] The first throttling mechanism 54 is connected to the first condensing mechanism 53 and the evaporating mechanism respectively, and is used to convert the first medium-pressure liquid into a first low-pressure liquid through throttling and transmit it to the first evaporating mechanism 51.

[0060] The first heat pump device 5 of this utility model is equipped with a first evaporation mechanism 51, a low-frequency compressor 52, a first condensation mechanism 53, and a first throttling mechanism 54. It can transfer heat in a low-frequency working state, thereby reducing energy consumption and saving costs.

[0061] Specifically, the second heat pump device 6 includes a second evaporation mechanism 61, a high-frequency compressor 62, a second condensation mechanism 63, and a second throttling mechanism 64;

[0062] The second evaporation mechanism 61 is connected to the heat storage device 8 and is used to absorb heat from the outside and / or the heat storage device 8 to vaporize the second low-pressure liquid to obtain the second low-pressure gas.

[0063] The high-frequency compressor 62 is connected to the evaporation mechanism to perform high-frequency heating and pressurization on the second low-pressure gas to obtain a second high-pressure gas.

[0064] The second condensing mechanism 63 is connected to the high-frequency compressor 62 and the heat storage device 8 respectively, and is used to liquefy the second high-pressure gas to obtain the second medium-pressure liquid, and release heat to the outside and the heat storage device 8.

[0065] The second throttling mechanism 64 is connected to the second condensing mechanism 63 and the evaporating mechanism respectively, and is used to convert the second medium-pressure liquid into a second low-pressure liquid through throttling and transmit it to the second evaporating mechanism 61.

[0066] It is understandable that the first low-pressure liquid and the second low-pressure liquid can be any refrigerant.

[0067] Specifically, both the first throttling mechanism 54 and the second throttling mechanism 64 are expansion valves.

[0068] It is understandable that the expansion valve can reduce the temperature and pressure of the first / second medium-pressure liquid, thereby improving the heat absorption efficiency of the first / second evaporation mechanism.

[0069] The second heat pump device 6 of this utility model is equipped with a second evaporation mechanism 61, a high-frequency compressor 62, a second condensation mechanism 63, and a second throttling mechanism 64. It can transfer heat in a high-frequency working state and improve heating efficiency.

[0070] Understandably, the first heat pump unit achieves low-frequency operation by reducing the compressor's operating frequency, while the second heat pump unit achieves high-frequency operation by increasing the compressor's operating frequency. The start / stop of both heat pump units can be adjusted according to changes in the external environment. In low-frequency operation, the first heat pump unit can maintain the temperature with smaller temperature fluctuations, providing more stable temperature control. In high-frequency operation, the second heat pump unit can quickly reach the set temperature, making it suitable for environments requiring rapid heating or cooling.

[0071] Specifically, a first heat-absorbing fan 55 is provided on the outer wall of the housing 1 at a position corresponding to the first evaporation mechanism 51. The first heat-absorbing fan 55 is connected to the first evaporation mechanism 51 and is used to deliver external heat to the first evaporation mechanism 51.

[0072] Specifically, a second heat-absorbing fan 65 is provided on the outer wall of the housing 1 at a position corresponding to the second evaporation mechanism 61. The second heat-absorbing fan 65 is connected to the second evaporation mechanism 61 and is used to deliver external heat to the second evaporation mechanism 61.

[0073] This utility model is provided with a first heat-absorbing fan 55 and a second heat-absorbing fan 65, which can transfer external heat to the first evaporation mechanism 51 and the second evaporation mechanism 61, thereby improving the heating efficiency of the first heat pump device 5 and the second heat pump device 6.

[0074] Specifically, the side wall of the housing 1 is provided with a plurality of heat dissipation holes 11 at positions corresponding to the first condensation mechanism 53 / second condensation mechanism 63.

[0075] The side wall of the housing 1 of this utility model is provided with a plurality of heat dissipation holes 11 at corresponding positions to the first condensation mechanism 53 / second condensation mechanism 63, which can improve heat transfer efficiency and avoid heat loss.

[0076] Specifically, the heat storage device 8 includes a heat collection unit and a heat storage unit;

[0077] The heat collection unit is connected to the first condensing mechanism 53 and the second condensing mechanism 63 respectively, and is used to collect the heat released by the first condensing mechanism 53 / the second condensing mechanism 63.

[0078] The heat storage unit is connected to the heat collection unit and is used to store the heat collected by the heat collection unit.

[0079] The present invention provides a heat storage device 8 with a heat collection unit and a heat storage unit, which can collect and store excess heat from the first condensing mechanism 53 and the second condensing mechanism 63 and transfer it to the first evaporating mechanism 51 and the second evaporating mechanism 61, thereby improving heat collection efficiency, reducing energy consumption, and reducing heat loss.

[0080] Specifically, the heat storage unit includes a liquid storage tank, which contains a heat-conducting liquid.

[0081] In practice, the heat transfer fluid can be a heat storage medium such as molten salt phase change heat storage material or mineral liquid.

[0082] This utility model's heat storage unit is equipped with a liquid storage tank for heat storage, which can reduce energy consumption and save costs.

[0083] Specifically, the first heat pump device 5 further includes a first heat transfer mechanism 56, and the second heat pump device 6 further includes a second heat transfer mechanism 66.

[0084] The first heat transfer mechanism 56 is connected to the first condensing mechanism 53 and the heat storage device 8 at both ends, respectively, to transfer part of the heat released by the first condensing mechanism 53 to the heat storage device 8.

[0085] The second heat transfer mechanism 66 is connected at both ends to the second condensation mechanism 63 and the heat storage device 8, respectively, so as to transfer part of the heat released by the second condensation mechanism 63 to the heat storage device 8.

[0086] This utility model is equipped with a first heat transfer mechanism 56 and a second heat transfer mechanism 66, which can transfer excess heat to the heat storage device 8, thereby improving heat transfer efficiency and avoiding heat loss.

[0087] In one specific embodiment, during the operation of the first heat pump device / second heat pump device, the first heat-absorbing fan / second heat-absorbing fan absorbs heat through circulating airflow and transfers external heat to the first evaporation mechanism / second evaporation mechanism. Additionally, the heat storage device transfers stored heat to the first evaporation mechanism / second evaporation mechanism via a heat transfer fluid. The first low-pressure gas / second low-pressure gas (low-temperature, low-pressure gaseous refrigerant) obtained after heat absorption and vaporization in the first evaporation mechanism / second evaporation mechanism is a low-temperature, low-pressure gas. After being heated and pressurized by a low-frequency compressor / high-frequency compressor, the first high-pressure gas / second high-pressure gas (high-temperature, high-pressure gaseous refrigerant) is a high-temperature, high-pressure gas. This gas then passes through the first condensation mechanism / second condensation mechanism. After liquefaction and heat release by the two condensing mechanisms, a medium-temperature and medium-pressure first / second medium-pressure liquid (medium-temperature and medium-pressure liquid refrigerant) is obtained. Most of the heat released by the first / second condensing mechanisms is transferred to the external environment requiring heat, and the remainder is transferred to the heat collection unit of the heat storage device through the first / second heat transfer mechanism for heat collection. The collected heat is transferred to the heat transfer liquid in the heat storage tank of the heat storage unit for heat storage. Finally, the first / second medium-pressure liquid is throttled and depressurized through the first / second throttling mechanism to obtain a low-temperature and low-pressure first / second low-pressure liquid (low-temperature and low-pressure liquid refrigerant), which is then transferred to the first / second evaporating mechanism for circulation.

[0088] The technical solution of this utility model has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A low-temperature variable frequency direct heating box-type integrated air conditioner, comprising a housing, characterized in that, The shell is equipped with a heat insulation plate, which divides the interior of the shell into a first cavity, a second cavity and a third cavity. The first cavity is equipped with a first heat pump device, the second cavity is equipped with a second heat pump device, and the third cavity is equipped with a heat storage device. The first heat pump device is used to transfer heat in a low-frequency operating state; The second heat pump device is used to transfer heat in a high-frequency operating state; The heat storage device is connected to the first heat pump device and the second heat pump device respectively, for collecting and storing heat.

2. The low-temperature variable frequency direct heating integrated unit according to claim 1, characterized in that, The first heat pump device includes a first evaporation mechanism, a low-frequency compression mechanism, a first condensation mechanism, and a first throttling mechanism; The first evaporation mechanism is connected to the heat storage device to absorb heat from the outside and / or the heat storage device to vaporize the first low-pressure liquid to obtain the first low-pressure gas. The low-frequency compression mechanism is connected to the evaporation mechanism to perform low-frequency heating and pressurization of the first low-pressure gas to obtain the first high-pressure gas. The first condensation mechanism is connected to the low-frequency compression mechanism and the heat storage device respectively, and is used to liquefy the first high-pressure gas to obtain the first medium-pressure liquid, and release heat to the outside and the heat storage device. The first throttling mechanism is connected to the first condensing mechanism and the evaporating mechanism respectively, so as to convert the first medium-pressure liquid into a first low-pressure liquid through throttling and transfer it to the first evaporating mechanism.

3. The low-temperature variable frequency direct heating integrated unit according to claim 2, characterized in that, The second heat pump device includes a second evaporation mechanism, a high-frequency compression mechanism, a second condensation mechanism, and a second throttling mechanism; The second evaporation mechanism is connected to the heat storage device to absorb heat from the outside and / or the heat storage device to vaporize the second low-pressure liquid to obtain the second low-pressure gas. The high-frequency compression mechanism is connected to the evaporation mechanism to perform high-frequency heating and pressurization of the second low-pressure gas to obtain a second high-pressure gas. The second condensation mechanism is connected to the high-frequency compression mechanism and the heat storage device respectively, and is used to liquefy the second high-pressure gas to obtain the second medium-pressure liquid, and release heat to the outside and the heat storage device. The second throttling mechanism is connected to the second condensing mechanism and the evaporating mechanism respectively, so as to convert the second medium-pressure liquid into a second low-pressure liquid through throttling and transfer it to the second evaporating mechanism.

4. The low-temperature variable frequency direct heating integrated unit according to claim 3, characterized in that, A first heat-absorbing fan is provided on the outer wall of the housing at a position corresponding to the first evaporation mechanism. The first heat-absorbing fan is connected to the first evaporation mechanism to deliver external heat to the first evaporation mechanism.

5. The low-temperature variable frequency direct heating integrated unit according to claim 4, characterized in that, A second heat-absorbing fan is provided on the outer wall of the housing at a position corresponding to the second evaporation mechanism. The second heat-absorbing fan is connected to the second evaporation mechanism to deliver external heat to the second evaporation mechanism.

6. The low-temperature variable frequency direct heating integrated unit according to claim 5, characterized in that, The sidewall of the housing is provided with a plurality of heat dissipation holes at positions corresponding to the first condensation mechanism / second condensation mechanism.

7. The low-temperature variable frequency direct heating integrated unit according to claim 6, characterized in that, The thermal storage device includes a heat collection unit and a thermal storage unit; The heat collection unit is connected to the first condensing mechanism and the second condensing mechanism respectively, and is used to collect the heat released by the first condensing mechanism / the second condensing mechanism; The heat storage unit is connected to the heat collection unit and is used to store the heat collected by the heat collection unit.

8. The low-temperature variable frequency direct heating integrated unit according to claim 7, characterized in that, The first heat pump device further includes a first heat transfer mechanism, and the second heat pump device further includes a second heat transfer mechanism; The first heat transfer mechanism is connected to the first condensation mechanism and the heat storage device at both ends, respectively, to transfer part of the heat released by the first condensation mechanism to the heat storage device. The second heat transfer mechanism is connected at both ends to the second condensation mechanism and the heat storage device, respectively, so as to transfer part of the heat released by the second condensation mechanism to the heat storage device.

9. The low-temperature variable frequency direct heating integrated unit according to claim 8, characterized in that, Both the first throttling mechanism and the second throttling mechanism are expansion valves.

10. The low-temperature variable frequency direct heating integrated unit according to claim 9, characterized in that, The heat storage unit includes a liquid storage tank, which contains a heat-conducting liquid.

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