Energy-saving refrigeration equipment with automatic refrigerant filling

Abstract

The present invention provides an energy-saving refrigeration device with automatic refrigerant filling, which belongs to the technical field of refrigeration equipment. It mainly includes a refrigerant filling component, a heat recovery device and an intelligent control system. The heat recovery device is used to recover the waste heat generated during the refrigeration cycle. The heat recovery device is connected to the condenser to absorb the heat emitted by the condenser and transport it to the evaporator or other components that need heat supply; the intelligent control system includes a temperature sensor and a pressure sensor, and the temperature sensor monitors the temperature of the heat storage medium in the heat recovery device in real time; the pressure sensor is installed on the refrigerant container of the refrigeration equipment; the refrigerant filling component includes a refrigerant buffer tank and an on-off valve connected thereto, and the pressure in the buffer tank is higher than the set pressure in the refrigerant container. When the pressure in the refrigerant container is lower than the set pressure, the refrigerant is replenished. The present invention can not only automatically fill the refrigerant, but also well achieve the purpose of energy saving and high efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of refrigeration equipment, in particular to energy-saving refrigeration equipment with an automatic refrigerant filling device. Background Art

[0002] With the intensification of the global energy crisis and the enhancement of people's environmental awareness, energy conservation and emission reduction have become the goals pursued by all walks of life. Due to the limitations of design and technology, traditional refrigeration equipment often has problems of high energy consumption and low efficiency. One of the most prominent manifestations is that the heat emitted by the condenser of some refrigeration equipment is directly discharged into the air, which not only causes a large loss of energy consumption, but also increases the placement of condensers in the workplace, such as the temperature around the outdoor unit of the refrigeration equipment, which puts higher requirements on the installation of refrigeration equipment. The site selection must be far away from the working and living area, which also makes it difficult to install the condenser and its auxiliary components of many refrigeration equipment.

[0003] On the other hand, for refrigeration equipment, refrigerant is the most critical. Although the refrigerant in traditional refrigeration equipment is generally not consumed quickly, after working for a long time, the refrigeration equipment will basically lose the refrigerator, which will gradually affect the refrigeration performance. This loss of refrigerant is slow and continuous, and it is generally not easy to detect. The direct experience is basically a decrease in refrigeration performance and the refrigeration equipment does not refrigerate. At this time, the refrigerant is actually seriously lacking, so it is necessary to call the manufacturer in time to add refrigerant to maintain its normal refrigeration performance. However, due to the lack of refrigerant during this period, not only the user experience and working performance are reduced, but also the compressor of the refrigeration equipment will be overloaded for a long time, wasting a lot of energy. Although in the prior art, there are also corresponding refrigerant filling and discharge devices to realize the filling, discharge and recovery of refrigerants, such as the publication number of Zhuhai Gree Electric Appliances application CN113154730A, the patent name is a refrigerant filling amount calculation method, device and refrigeration equipment; the publication number is CN113390209A , the patent name is a device and method for replenishing refrigerant to a refrigeration system without a pressurizing device in winter; the publication number is CN113465241B, the patent name is a method for automatically filling refrigerant, an automatic filling device and a refrigeration device; and the publication number is CN102762936A, the patent name is a method for recovering refrigerant in a refrigeration device. This series of prior arts have tried to design corresponding refrigerant filling and discharge structures for refrigeration equipment, but the system structures for automatic refrigerant filling are relatively complex, and the refrigerant The filling amount adopts the method of specific calculation value. The system sets the specific volume after conversion. Although it is accurate, it is also cumbersome. Moreover, it requires a large number of supporting equipment components and is not easy to install. As an auxiliary structure of the refrigeration equipment, it is not realistic. It can be used as a special manufacturer's after-sales service. However, this seriously affects the timeliness of automatic and timely addition of refrigerant. It still requires human active reporting before it can be carried out. During the period of partial loss of refrigerant, in order to achieve the refrigeration effect, the system has a large power consumption waste caused by the long-term high-load operation of the compressor. Summary of the invention

[0004] In view of the introduction to the above technical status quo, the purpose of the present invention is to provide an energy-saving refrigeration equipment with automatic refrigerant filling. In this energy-saving refrigeration equipment with automatic refrigerant filling, one of its core features is the provision of an auxiliary device for refrigerant filling and discharge. It not only adopts a simple and reliable structural design, but can automatically perform timely filling, replenishment and discharge of refrigerant to maintain high-efficiency refrigeration performance, but also can recycle the heat generated by the condenser, thereby greatly saving energy consumption. At the same time, it also largely avoids the problem of installation limitations of the external unit of the refrigeration equipment.

[0005] To achieve the above object, the present invention provides an energy-saving refrigeration device with automatic refrigerant filling, which comprises at least a compressor, a condenser and an evaporator, a refrigerant filling component, a heat recovery device and an intelligent control system, wherein: The heat recovery device is used to recover the waste heat generated during the refrigeration cycle. The heat recovery device is connected to the condenser to absorb the heat emitted by the condenser and transport it to the evaporator or other components that require heat supply; the intelligent control system includes a temperature sensor and a pressure sensor. The temperature sensor monitors the temperature of the heat storage medium in the heat recovery device in real time. When the temperature reaches the set value, the heat storage medium flows to the evaporator; the pressure sensor is installed on the refrigerant container of the refrigeration equipment, and is used to monitor the pressure of the refrigerant in the refrigerant container in real time; the refrigerant filling component includes a refrigerant buffer tank and an on-off valve connected thereto. The pressure in the buffer tank is higher than the set pressure in the refrigerant container. The on-off valve is connected to the refrigerant filling port of the refrigeration equipment. When the pressure in the refrigerant container is lower than the set pressure, the on-off valve can allow the refrigerant to flow from the buffer tank into the refrigerant container until its pressure returns to the set pressure.

[0006] Further, the heat energy recovery device comprises an insulated shell and an insulated pipe, and a delivery pump and a control valve installed on the insulated pipe, wherein the insulated shell is arranged outside the condenser, and the heat storage medium is filled in the insulated shell;

[0007] The condenser includes a condensing tube and a heat-conducting cover arranged in a serpentine shape. The heat-conducting cover is located as a whole inside the heat-insulating shell to be immersed in the heat storage medium. The inner wall of the heat-conducting cover bulges outward to form an inner expansion cavity, and the inner expansion cavity is a strip-shaped cavity with a rectangular cross-section. The condensing tube is arranged in a serpentine shape from top to bottom, and the inner expansion cavity is spaced apart at a distance that gradually increases from top to bottom in the heat-conducting cover.

[0008] Furthermore, the width of the inner expansion cavity increases gradually from top to bottom in the heat conductive cover.

[0009] Furthermore, a heat-conducting medium is provided in the heat-conducting cover, and the heat-conducting medium is in direct contact with the condensing tube.

[0010] Furthermore, the inner wall of the heat-insulating shell has a plurality of fins, and at least a portion of the fins are in close contact with the outer wall of the inner expansion cavity.

[0011] Furthermore, at several pipe sections near the inlet end of the condenser pipe, the ribs are sandwiched between corresponding adjacent inner expansion cavities in a sliding plug-in manner, and when the ribs are inserted between the corresponding side walls of the two inner expansion cavities, the insulating outer shell is fixed to the outside of the heat conductive cover.

[0012] Furthermore, the cavity wall of the inner expansion cavity and the ribs are both in a wavy structure, and when the ribs are inserted between two adjacent inner expansion cavity side walls, the wave crests and wave troughs of the wavy structure between the two are embedded and matched with each other.

[0013] Furthermore, a sliding plate is installed in the cache tank in an axially sliding manner, and the area between the sliding plate and the bottom of the cache tank is pre-filled with refrigerant, and the area is connected to the opening and closing valve;

[0014] An air bag is installed above the sliding plate in compression contact with the sliding plate, and the air bag is squeezed by a pressure plate axially installed above the buffer tank so that the internal pressure of the pre-charged refrigerant is a set value at this time.

[0015] Furthermore, the upper part of the pressure plate is rotatably connected to a positioning stud, the positioning stud can rotate inside the pressure plate without being separated from the pressure plate, and when the stud cooperates with the tank top thread of the cache tank to move axially downward, the pressure plate can be moved downward synchronously with it;

[0016] The end of the positioning stud exposed from the tank top has a slot for inserting the main shaft of a micro motor for transmission connection. The condition for starting the micro motor is whether the detection value of a pressure sensor element on the cache tank is lower than the set pressure.

[0017] Furthermore, a constant-pressure pipe section is provided at the bottom of the buffer tank, and a piston is installed in the constant-pressure pipe section in an axially sliding manner. The top surface of the piston faces the interior of the buffer tank, and its bottom surface is in contact with the bottom closed end of the constant-pressure pipe section through a pressure-bearing cone spring, and an upper air vent and a lower air vent are arranged up and down on the pipe wall of the constant-pressure pipe section. The two air vents are respectively connected through a gas pipeline and two ports of a three-way valve, and the other port of the three-way valve is connected to the refrigerant container; under normal circumstances, the three-way valve When the valve is switched to the position where the gas pipeline and the lower air vent are connected and the pressure in the refrigerant container is the set pressure, the piston is located between the two air vents. When the pressure is lower than the set pressure, the piston moves downward to connect the flow channel hole inside it with the lower air vent, and the refrigerant automatically flows from the buffer tank into the refrigerant container. Accordingly, the micro motor starts, causing the positioning stud to move downward. When the pressure value in the refrigerant container returns to the set pressure and the pressure in the buffer tank is higher than the set pressure, the micro motor stops.

[0018] Beneficial effect: The energy-saving refrigeration equipment with automatic refrigerant filling recorded in the present invention can absorb the heat emitted by the condenser and selectively transport it to the evaporator and other components and equipment that require heating, recover the heat, make full use of the thermal energy, and achieve the purpose of high efficiency and energy saving.

[0019] On the other hand, the refrigerant filling component can be installed on the refrigeration equipment to automatically and timely replenish the refrigerant, so that the refrigeration equipment is always in the best refrigeration state, avoiding the energy waste caused by the long-term high-load operation of the compressor due to the lack of refrigerant, and then achieving the purpose of high efficiency and energy saving. In addition, the refrigerant filling component in the present invention can also output the refrigerant to the buffer tank when necessary, that is, discharge the refrigerant, and recycle the refrigerant, realizing the integration of the refrigerant filling and discharge functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The following are auxiliary illustrations for explaining some specific embodiments of the present invention. The drawings described are mainly the principles of the specific operation execution structures or methods of some embodiments of the present invention. However, this does not mean that the physical structure or operation steps of the present invention can only be as shown in the drawings.

[0021] Figure 1 It is a schematic diagram of the installation and connection between the heat recovery device of the present invention and the condenser;

[0022] Figure 2 It is a structural schematic diagram of the refrigerant charging component in the present invention;

[0023] Figure 3 It is a structural diagram of ribs.

[0024] In the figure, condenser 1, heat-conducting cover 2, insulating shell 3, inner expansion cavity 4, ribs 5, cache tank 6, sliding plate 7, air bag 8, pressure plate 9, stud 10, slot 1001, micro motor 11, constant pressure pipe section 12, piston 13, flow channel hole 1301, pressure-bearing cone spring 14, lower air vent 15, upper air vent 16, gas transmission pipeline 17, three-way valve 18, main pipeline 19. DETAILED DESCRIPTION

[0025] The embodiments of the present invention will be fully described below, and some core features of the embodiments will be specifically shown in the accompanying drawings, wherein the same or similar reference numerals in the drawings represent the same or similar technical features, or structures or steps or processes with similar functions. Other embodiments replaced by ordinary technicians based on these embodiments without the need for creative work also belong to the protection scope of the present invention.

[0026] In this embodiment, an energy-saving refrigeration device with automatic refrigerant filling includes at least a compressor, a condenser and an evaporator, as well as expansion valves and other components. The specific connection structure and method can be implemented with reference to the prior art. The difference is that in this embodiment, a refrigerant filling component is specially set up to fill the refrigerant or discharge and recover the refrigerant; at the same time, a heat recovery device and an intelligent control system are also provided. Specifically, this heat recovery device is used to recover the waste heat generated during the refrigeration cycle. The heat recovery device is connected to the condenser to absorb part of the heat dissipated by the condenser to prevent it from being directly dissipated to the external environment. Moreover, this heat can be transported to the evaporator as a heat source. Of course, it can also be supplied to other equipment for heating. The specific heating method can actually refer to the heat absorption of the condenser in this embodiment, which is itself a relative process, or refer to the prior art for adaptive design. The intelligent control system includes a temperature sensor and a pressure sensor, wherein the temperature sensor monitors the temperature of the heat storage medium in the heat recovery device in real time. When the temperature reaches the set value, the heat storage medium flows to the evaporator to heat it, so as to avoid that when the temperature of the external environment is too low, the heat that can be recovered into the heat recovery device after the condenser dissipates heat is too little, and the heat energy recovered is not enough to make up for the power consumption generated by the transmission of these heat energies, because the heat recovery in this embodiment is selective, not continuous, and the main consideration is the amount of overall energy consumption. The above-mentioned pressure sensor is installed on the refrigerant container of the refrigeration equipment to monitor the pressure of the refrigerant stored in the refrigerant container in real time. These refrigerant containers correspond to the types of refrigeration equipment respectively. In conventional refrigeration systems, the refrigerant is stored in the outdoor unit, so the outdoor unit is the refrigerant container, and in some refrigeration systems, it exists in the refrigeration pipeline between the outdoor unit and the indoor unit, so the refrigeration pipeline or the condenser 1 itself is the refrigerant container, so that the pressure generated by the refrigerant can be monitored in real time to determine the amount of refrigerant. It should be noted here that, although the pressure of the refrigerant is not fixed according to different refrigeration working conditions, it should be within a rated range. Therefore, monitoring whether the pressure in the refrigerant container is lower than a set pressure is one of the detection goals.

[0027] For heat recovery devices, the most common practice is to bring the heat storage medium with good thermal conductivity into contact with the condenser to heat it up, and then transport it to the corresponding heating component, such as the corresponding part of the evaporator, to heat it and provide heat energy to achieve heat recovery.

[0028] At the same time, Figure 2As shown, the refrigerant filling component in this embodiment includes a refrigerant buffer tank 6 and an on-off valve connected thereto. The on-off valve is mainly opened and closed flexibly according to the pressure change in the buffer tank 6 to replenish the refrigerant into the refrigerant container. Specifically, the pressure in the buffer tank 6 is higher than the set pressure in the refrigerant container, so that the refrigerant can be replenished quickly and actively. During the specific production, the on-off valve is connected to the refrigerant filling port of the refrigeration equipment. When the pressure in the refrigerant container is lower than the set pressure, the on-off valve can allow the refrigerant to flow from the buffer tank 6 into the refrigerant container until its pressure returns to the set pressure, thereby achieving the purpose of timely and automatic refrigerant replenishment.

[0029] like Figure 1 As shown, the heat recovery device of this embodiment includes an insulated shell 3 and an insulated pipe, as well as a delivery pump and a control valve installed on the insulated pipe. The insulated pipe (not shown in the figure) is a pipe for delivering heat storage medium connected to the insulated shell 3. The delivery pump actively pumps the heat storage medium to the corresponding heating component, and the control valve is opened only when the heat storage medium needs to be pumped, and is normally closed. During installation, the insulated shell 3 is set outside the condenser, and the insulated shell 3 is filled with heat storage medium to absorb heat from the condenser. Specifically, Figure 1 Unlike common condensers, this condenser, in addition to the condensing tube 1 arranged in a serpentine shape, also has a special heat-conducting cover 2 instead of common heat-dissipating fins. The heat-conducting cover 2 is entirely located inside the heat-insulating shell 3 so as to be immersed in the heat storage medium to dissipate heat sufficiently. The inner wall of the heat-conducting cover 2 bulges outward to form an inner expansion cavity 4. The heat-conducting medium can flow into these inner expansion cavities 4 and dissipate heat through the cavity wall, which greatly increases the heat dissipation area and realizes sufficient heat transfer with the heat storage medium. More specifically, this inner expansion cavity 4 is a strip-shaped cavity with a rectangular cross-section, which can well expand the heat dissipation surface. Figure 1 The condenser tube 1 is arranged in a serpentine shape from top to bottom, and the spacing distance of the inner expansion cavity 4 gradually increases in the direction from top to bottom in the heat-conducting cover 2. This is because the refrigerant is gradually cooled in the flow direction in the condenser tube 1, and the temperature is lower as it flows backward. In order to ensure timely cooling, the inner expansion cavity 4 is arranged more densely within a certain length near the entrance of the condenser tube 1. Similarly, the width of the inner expansion cavity 4 can also be increased one by one in the direction from top to bottom in the heat-conducting cover 2.

[0030] During implementation, the heat conducting medium in the heat conducting cover 2 is in direct contact with the condenser tube 1 to improve the cooling efficiency. Figure 1 The inner wall of the heat-insulating shell 3 is provided with a plurality of fins 5, which protrude and extend toward the inside of the heat-insulating shell 3, and at least a portion of the fins 5 should be in contact with the outer wall of the inner expansion cavity 4 to achieve direct contact heat dissipation.

[0031] Considering the condensation characteristics of the serpentine condenser tube 1, as Figure 1 As shown, at several sections near the inlet end of the condenser tube 1, that is, Figure 1 The upper part of the Figure 1 Not all fins 5 are completely drawn in the figure, only partial areas are shown), between the corresponding adjacent inner expansion cavities 4, fins 5 are to be clamped in a sliding plug-in manner, and when the fins 5 are inserted between the corresponding side walls of the two inner expansion cavities 4, the insulating shell 3 is fixed to the outside of the heat-conducting cover 2. Such an installation structure can, on the one hand, provide sufficient contact heat dissipation, and on the other hand, also play a role in positioning and installation.

[0032] like Figure 3 As shown, the cavity wall of the inner expansion cavity 4 and the fins 5 are both wavy structures, and it is better if one of them has elasticity to facilitate smoother and tighter insertion. When the fins 5 are inserted between the side walls of the two adjacent inner expansion cavities 4, the crests and troughs of the wavy structure between the two are embedded in each other, so that heat transfer is sufficient and positioning is more secure.

[0033] In this embodiment, for the refrigerant charging components, please refer to Figure 2 , a sliding plate 7 is installed in the buffer tank 6 in an axially sliding manner, and the area between the sliding plate 7 and the bottom of the buffer tank 6 is pre-filled with refrigerant, and the area is connected to the opening and closing valve. Usually, the opening and closing valve is installed at the bottom of the buffer tank 6 so that the refrigerant can be fully output. In addition, an air bag 8 is installed above the sliding plate 7 in a pressing contact with it. The air bag 8 is filled with a certain amount of inert compressed gas. The air bag 8 is squeezed by a pressure plate 9 axially installed on the top of the buffer tank 6 so that the internal pressure of the pre-filled refrigerant at this time is the set value. In addition to the stable and reliable structure of the air bag 8 itself, it is also sealed to maintain the pressure environment formed by the pre-filled refrigerant stable and leak-proof.

[0034] like Figure 2 As shown, the upper part of the pressure plate 9 is rotatably connected with a positioning stud 10, and the positioning stud 10 can rotate inside the pressure plate 9 without being separated from the pressure plate 9, so that even if the positioning stud 10 moves upward, the pressure plate 9 also moves accordingly, and when the stud 10 and the tank top thread of the buffer tank 6 move axially downward in cooperation, the pressure plate 9 can be moved downward synchronously with the pressure plate 9, thereby increasing the pressure inside the buffer tank 6 and maintaining the normal state where the pressure is higher than the pressure inside the refrigerant container. As one of the specific implementation structures, the end of the positioning stud 10 exposed from the tank top has a slot 1001, and the slot 1001 is for the main shaft of the micro motor 11 to be inserted and connected in transmission. The condition for starting or not the micro motor 11 is whether the detection value of a pressure sensor element (not shown in the figure) on the buffer tank 6 is lower than the set pressure. If it is lower, the micro motor 11 starts.

[0035] As a best practice structure, Figure 2As shown, a constant-pressure pipe section 12 is also provided at the bottom of the buffer tank 6, and a piston 13 is axially slidably installed in the constant-pressure pipe section 12. The piston 13 has an L-shaped flow channel hole 1301. The top surface of the piston 13 faces the inside of the buffer tank 6, and its bottom surface is in contact with the bottom closed end of the constant-pressure pipe section 12 through a pressure-bearing cone spring 14. The pressure-bearing cone spring 14 is provided because the upper and lower sides of the piston 13 must maintain pressure balance, and the pressure in the buffer tank 6 must be higher than that in the refrigerant container. Therefore, the pressure-bearing cone spring 14 must maintain an extension tendency to have an upward thrust, so that the pressure in the refrigerant container and the pressure-bearing cone spring 14 can balance the pressure of the refrigerant in the buffer tank 6 together. During the manufacturing process, an upper vent hole 16 and a lower vent hole 15 are arranged vertically on the wall of the constant pressure pipe section 12. The two vent holes are connected through a gas pipeline 17 and two ports of a three-way valve 18, respectively. The other port of the three-way valve 18 is connected to the refrigerant container, which can be specifically connected to the refrigerant container through a main pipeline 19, for example, connected to the inside of the condenser tube 1 through the main pipeline 19. Under normal conditions, the above-mentioned three-way valve 18 switches to the position where the corresponding gas pipeline 17 and the lower vent hole 15 are connected. At this time, the refrigerant container is connected to the space below the piston 13, and when the pressure in the refrigerant container is the set pressure, the piston 13 is located between the two vent holes, which is the normal state of the refrigerant quantity of the refrigeration equipment; when it is lower than the set pressure, the piston 13 moves downward accordingly, and then the above-mentioned flow channel hole 1301 inside it is connected to the lower vent hole 15, that is, the refrigerant container is temporarily connected to the buffer tank 6. Because of the pressure difference, the refrigerant flows from the buffer tank 6. It automatically flows into the refrigerant container to fill and replenish the refrigerant. Correspondingly, if the refrigerant replenished is too much, the pressure in the buffer tank 6 will inevitably decrease, then the micro motor 11 starts, causing the positioning stud 10 to move downward, compressing the effective volume of the buffer tank 6 below the sliding plate 7, causing the refrigerant pressure inside it to rise. When the pressure value in the refrigerant container returns to the set pressure, and at the same time the pressure in the buffer tank 6 is higher than the set pressure, the micro motor 11 stops, and the piston 13 returns to the position between the two vents without being connected to any of the vents. When it is necessary to discharge the refrigerant or recover the refrigerant, the micro motor 11 reverses, and the piston 13 moves up accordingly. The pressure in the buffer tank 6 can be less than that in the refrigerant container. At this time, the refrigerant in the refrigerant container can flow back into the buffer tank 6, that is, the piston 13 moves up to Figure 2 When the refrigerant is in the extreme position, the flow channel hole 1301 is connected to the upper vent hole 16 , the three-way valve 18 adjusts the switch position, and the refrigerant enters the buffer tank 6 through the upper vent hole 16 .

[0036] The above series of specific implementation details are merely some preferred embodiments of the present invention and cannot be used to limit the protection scope of the claims of the present invention. A person skilled in the art can simply change the design ideas based on the understanding of the above embodiments and the reference to the basic principles recorded in the claims of the present invention. However, these design changes still fall within the protection scope of the invention.

Claims

1. An energy-saving refrigeration device with automatic refrigerant filling, comprising at least a compressor, a condenser and an evaporator, characterized in that: It also includes a refrigerant charging component, a heat recovery device and an intelligent control system, wherein: The heat recovery device is used to recover the waste heat generated during the refrigeration cycle. The heat recovery device is connected to the condenser to absorb the heat emitted by the condenser and transfer it to the evaporator or other components that need heat supply; The intelligent control system includes a temperature sensor and a pressure sensor. The temperature sensor monitors the temperature of the heat storage medium in the heat energy recovery device in real time. When the temperature reaches a set value, the heat storage medium flows to the components that need to be heated. The pressure sensor is installed on the refrigerant container of the refrigeration equipment to monitor the pressure of the refrigerant in the refrigerant container in real time. The refrigerant filling component comprises a refrigerant buffer tank (6) and an on-off valve connected thereto, the pressure in the buffer tank (6) is higher than the set pressure in the refrigerant container, the on-off valve is connected to the refrigerant filling port of the refrigeration equipment, and when the pressure in the refrigerant container is lower than the set pressure, the on-off valve can allow the refrigerant to flow from the buffer tank (6) into the refrigerant container until the pressure thereof returns to the set pressure; A sliding plate (7) is installed in the buffer tank (6) in an axially sliding manner, and the area between the sliding plate (7) and the bottom of the buffer tank (6) is pre-filled with refrigerant, and the area is connected to the opening and closing valve; an air bag (8) is installed above the sliding plate (7) in a pressing contact therewith, and the air bag (8) is pressed by a pressure plate (9) installed axially in a sliding manner on the top of the buffer tank (6), so that the internal pressure of the pre-filled refrigerant at this time is a set value; The upper part of the pressure plate (9) is rotatably connected to a positioning stud (10), and the positioning stud (10) can rotate inside the pressure plate (9) without being separated from the pressure plate (9), and when the stud (10) and the tank top thread of the buffer tank (6) are axially moved downward, the pressure plate (9) can be moved downward synchronously; the end of the positioning stud (10) exposed from the tank top has a slot (1001) for the main shaft of a micro motor (11) to be inserted and connected for transmission, and the condition for starting or not the micro motor (11) is whether the detection value of a pressure sensor element on the buffer tank (6) is lower than the set pressure; A constant pressure pipe section (12) is also provided at the bottom of the buffer tank (6), and a piston (13) is installed in the constant pressure pipe section (12) in an axially sliding manner. The top surface of the piston (13) faces the inside of the buffer tank (6), and its bottom surface is in contact with the bottom closed end of the constant pressure pipe section (12) through a pressure-bearing cone spring (14). An upper air vent (16) and a lower air vent (15) arranged up and down are provided on the tube wall of the constant pressure pipe section (12). The two air vents are respectively connected through a gas pipeline (17) and two ports of a three-way valve (18), and the other port of the three-way valve (18) is connected to the refrigerant container; under normal conditions, the three-way valve (18) is connected to the refrigerant container. The valve (18) is switched to a position where the gas pipeline (17) and the lower air vent (15) are connected, and when the pressure in the refrigerant container is the set pressure, the piston (13) is located between the two air vents. When the pressure is lower than the set pressure, the piston (13) moves downward and the flow channel hole (1301) inside it is connected to the lower air vent (15). The refrigerant automatically flows from the buffer tank (6) into the refrigerant container, and accordingly, the micro motor (11) is started, causing the positioning stud (10) to move downward. When the pressure value in the refrigerant container returns to the set pressure and the pressure in the buffer tank (6) is higher than the set pressure, the micro motor (11) stops.

2. The energy-saving refrigeration equipment with automatic refrigerant filling according to claim 1, characterized in that: The heat energy recovery device comprises an insulated shell (3) and an insulated pipeline, and a delivery pump and a control valve installed on the insulated pipeline, wherein the insulated shell (3) is arranged outside the condenser, and the heat storage medium is filled into the insulated shell (3); The condenser comprises a condensing tube (1) and a heat-conducting cover (2) arranged in a serpentine shape. The heat-conducting cover (2) is entirely located inside the heat-insulating shell (3) so as to be immersed in the heat storage medium. The inner wall of the heat-conducting cover (2) bulges outward to form an inner expansion cavity (4). The inner expansion cavity (4) is a strip-shaped cavity with a rectangular cross-section. The condensing tube (1) is arranged in a serpentine shape from top to bottom. The inner expansion cavity (4) is spaced apart at a distance that gradually increases in a direction from top to bottom inside the heat-conducting cover (2).

3. The energy-saving refrigeration equipment with automatic refrigerant filling according to claim 2, characterized in that: The width of the inner expansion cavity (4) increases gradually from top to bottom in the heat-conducting cover (2).

4. The energy-saving refrigeration equipment with automatic refrigerant filling according to claim 2, characterized in that: A heat-conducting medium is provided in the heat-conducting cover (2), and the heat-conducting medium is in direct contact with the condensing tube (1).

5. The energy-saving refrigeration equipment with automatic refrigerant filling according to claim 2, characterized in that: The inner wall of the heat-insulating outer shell (3) has a plurality of fins (5), and at least a portion of the fins (5) are in close contact with the outer wall of the inner expansion cavity (4).

6. The energy-saving refrigeration equipment with automatic refrigerant filling according to claim 5, characterized in that: At a plurality of pipe sections near the inlet end of the condenser pipe (1), the ribs (5) are sandwiched between a plurality of adjacent inner expansion chambers (4) in a sliding manner, and when the ribs (5) are inserted between the side walls of the corresponding two inner expansion chambers (4), the heat-insulating outer shell (3) is fixed to the outside of the heat-conducting cover (2).

7. The energy-saving refrigeration equipment with automatic refrigerant filling according to claim 6, characterized in that: The cavity wall of the inner expansion cavity (4) and the rib (5) both have a wave-like structure. When the rib (5) is inserted between the side walls of two adjacent inner expansion cavities (4), the wave crests and wave troughs of the wave-like structure between the two are embedded and matched with each other.

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