Air-cooled refrigerator bypass heat exchange device, refrigerator, method, terminal and medium

Abstract

The invention discloses an air-cooled refrigerator bypass heat exchange device, a refrigerator, a method, a terminal and a medium. The air-cooled refrigerator bypass heat exchange device comprises a bypass pipe, a compressor, an air return pipe, an evaporator, a condenser, an anti-condensation pipe, a filter and a capillary pipe. The compressor comprises a compressor body, a compressor exhaust pipe and a compressor air suction pipe. The compressor exhaust pipe and the compressor air suction pipe are both connected to the compressor body. The air return pipe is connected between the evaporator and an air suction pipe of the compressor, the bypass pipe is connected between the air return pipe and an exhaust pipe of the compressor, and the condenser is connected with the anti-condensation pipe and arranged between the compressor and the filter; the capillary connects the filter and the evaporator. Aiming at the problem of condensation on the surface of the air return pipe in the starting stage of the refrigerator, the temperature of a refrigerant in the air return pipe is increased by additionally arranging the bypass pipe and a related control mechanism, and the condensation phenomenon is reduced; according to the invention, finer management of the refrigerating system of the refrigerator is realized by opening and closing the precise control valve.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of refrigerator refrigeration, in particular to an improved bypass heat exchange device of a forced air cooling refrigerator refrigeration system, a refrigerator and a heat exchange method. BACKGROUND

[0002] The refrigeration system of a forced air cooling refrigerator generally consists of a compressor, a condenser, an anti-condensation pipe, a filter, a capillary tube, an evaporator and a return air pipe. The heat exchange between the capillary tube and the return air pipe is achieved by means of butt welding or aluminum foil wrapping, which aims to prevent the occurrence of condensation on the surface of the return air pipe when the ambient humidity is too high, thereby affecting the reliability of the system and the user experience. However, during the start-stop cycle of the refrigerator, especially during the start-up phase, the liquid refrigerant stored in the evaporator can cause condensation to occur on the surface of the return air pipe for a short period of time, affecting the performance of the system.

[0003] The prior art discloses a hot gas defrosting system for a refrigerator and a control method thereof, including a normal cooling mode and a hot gas defrosting mode, wherein the hot gas defrosting mode includes two branches, the high-temperature exhaust gas of the compressor is used to defrost the freezer evaporator, and the heat exchange with the cooling branch makes it supercooled, and after pressure regulation, it returns to the compressor. However, the deficiency of the prior art is that the high-temperature exhaust gas of the compressor flows into the evaporator, melts the frost layer on the surface of the evaporator, but lacks measures to handle the condensation on the outlet section of the return air pipe. SUMMARY

[0004] To solve the deficiencies in the prior art, the present application provides an improved bypass heat exchange device for a forced air cooling refrigerator refrigeration system, which mixes the high-temperature exhaust gas with the outlet pipe section of the evaporator and returns to the compressor, which can not affect the low-temperature refrigeration of the evaporator, but also can improve the return air temperature of the compressor, avoid condensation on the outlet section of the return air pipe, and reduce the occurrence of condensation in the refrigerator.

[0005] The present application adopts the following technical solutions.

[0006] The present application provides a bypass heat exchange device for a forced air cooling refrigerator in the first aspect, which includes a refrigeration system and a control system arranged inside the forced air cooling refrigerator, and the refrigeration system includes: a bypass pipe, a compressor, a return air pipe, an evaporator, a condenser, an anti-condensation pipe, a filter and a capillary tube; The compressor includes a compressor body, a compressor exhaust pipe and a compressor suction pipe; the compressor exhaust pipe and the compressor suction pipe are both connected to the compressor body; the return air pipe is connected between the evaporator and the compressor suction pipe, the bypass pipe is connected between the return air pipe and the compressor exhaust pipe, the condenser is connected with the anti-condensation pipe and arranged between the compressor and the filter; and the capillary tube connects the filter and the evaporator.

[0007] In a possible implementation, the bypass pipe and the return air pipe are both wrapped in aluminum foil for heat exchange.

[0008] In one possible implementation, the control system includes a temperature and humidity sensor and a control valve; The temperature and humidity sensor is arranged inside the refrigerator, and the control valve is arranged between the compressor exhaust pipe and the condenser to control the opening and closing of the bypass pipe.

[0009] In a possible implementation, the temperature and humidity sensor includes a temperature sensor, a humidity sensor, and an ambient temperature sensor; The humidity sensor and the ambient temperature sensor are arranged in the hinge box of the refrigerator, and the temperature sensor is arranged on the surface of the return air duct; the temperature sensor is used to collect the surface temperature of the return air duct; the humidity sensor is used to collect the humidity inside the refrigerator; and the ambient temperature sensor is used to collect the ambient temperature.

[0010] The second aspect of the present invention discloses an air-cooled refrigerator. The invention comprises the above-mentioned bypass heat exchange device of the air-cooled refrigerator.

[0011] The third aspect of the present invention discloses a heat exchange method, using the above refrigerator, During the startup phase of the refrigerator, the normal refrigeration circuit and the anti-condensation circuit are activated simultaneously, the control valve is opened, and most of the refrigerant flows back to the compressor through the bypass pipe. The high-temperature and high-pressure gas refrigerant in the bypass pipe exchanges heat with the low-temperature and low-pressure liquid refrigerant in the return pipe. When the opening time of the control valve reaches a preset time threshold, the control valve is closed, the bypass pipe stops working, the anti-condensation circuit is closed, and only the normal refrigeration circuit is enabled.

[0012] In a possible implementation, the normal refrigeration circuit and the anti-condensation circuit are connected in parallel and switched to operate via the control valve.

[0013] In a possible implementation, in the normal refrigeration circuit, the refrigerant flow path is: compressor → control valve → condenser → anti-condensation tube → filter → capillary tube → evaporator → return air pipe → compressor; In the anti-condensation circuit, the refrigerant flow path is: compressor → control valve → bypass pipe → compressor.

[0014] In a possible implementation, the control valve opening condition is: the return air pipe surface temperature ≤ the preset dew point temperature, and the time the return air pipe temperature is lower than the dew point temperature ≤ the preset time below the dew point temperature; The control valve closing condition is: the return air pipe surface temperature is greater than the preset return air pipe surface temperature value, or the time when the return air pipe temperature is lower than the dew point temperature is greater than the preset time when the temperature is lower than the dew point temperature, or the control valve opening time is greater than the preset opening time.

[0015] A fourth aspect of the present invention discloses a terminal, comprising a processor and a storage medium; The storage medium is used to store instructions; The processor is configured to operate according to the instructions to execute the steps of the above method.

[0016] A fifth aspect of the present invention discloses a computer-readable storage medium having a computer program stored thereon. When the program is executed by a processor, the steps of the above method are implemented.

[0017] The beneficial effect of the present invention is that, compared with the prior art, (1) The bypass heat exchange device proposed in the present invention effectively avoids condensation in the return air pipe during the initial startup of the refrigerator, thereby improving system stability and user satisfaction; (2) The present invention achieves more sophisticated management of the refrigerator refrigeration system by precisely controlling the opening and closing of the valve; (3) The present invention addresses the problem of condensation on the surface of the return air pipe during the startup phase of the refrigerator. By adding a bypass pipe and its related control mechanism, the temperature of the refrigerant in the return air pipe is increased, thereby reducing the occurrence of condensation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of an air-cooled refrigerator provided by an embodiment of the present invention; Figure 2 A schematic diagram of a refrigeration system for an air-cooled refrigerator provided in an embodiment of the present invention; Figure 3 A control logic diagram of a control valve provided in an embodiment of the present invention.

[0019] In the figure, 1- Temperature and humidity sensor, 2- Return air pipe, 3- Bypass pipe, 4- Filter, 5- Compressor, 6- Intake pipe, 7- Exhaust pipe, 8- Control valve, 9- Evaporator, 10- Return air heat exchange section, 11- Capillary tube, 12- Anti-condensation tube, 13- Condenser. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. The embodiments described in this application are only part of the embodiments of the present invention, not all of them. Based on the spirit of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] Example 1 like Figure 1-2 As shown, embodiment 1 of the present invention provides a bypass heat exchange device for an air-cooled refrigerator, including a refrigeration system and a control system. A plurality of compartments are provided inside the box, and the refrigeration system and the control system are both provided inside the box. Among them, the refrigeration system includes a bypass pipe 3, a compressor 5, a return air pipe 2, an evaporator 9, a condenser 13, an anti-condensation pipe 12, a filter 4 and a capillary tube 11; among them, the compressor 5 includes a compressor body, a compressor exhaust pipe and a compressor suction pipe; the compressor exhaust pipe and the compressor suction pipe are both connected to the compressor body; the return air pipe 2 is connected between the evaporator 9 and the compressor suction pipe, the bypass pipe 3 is connected between the return air pipe 2 and the compressor exhaust pipe, the condenser 13 is connected to the anti-condensation pipe 12, and is arranged between the compressor 5 and the filter 4; the capillary tube 11 connects the filter 4 and the evaporator 9.

[0022] The bypass pipe 3 is connected to the return air pipe 2. Both the bypass pipe 3 and the return air pipe 2 are wrapped with aluminum foil for heat exchange, thereby increasing the temperature of the refrigerant in the return air pipe.

[0023] The control system includes a temperature and humidity sensor 1 and a control valve 8. The temperature and humidity sensor 1 includes a temperature sensor, a humidity sensor, and an ambient temperature sensor. The humidity and ambient temperature sensors are located inside the refrigerator, specifically within the hinge box. Temperature sensors are located on the surface of the return air duct and at the evaporator inlet and outlet. The temperature sensor measures the surface temperature Tp of the return air duct 2; the humidity sensor measures the humidity Tb inside the refrigerator; and the ambient temperature sensor measures the ambient temperature Ts. The dew point temperature Td is predicted using the temperature and humidity sensors. Control valve 8, located between the compressor exhaust pipe and the condenser 13, controls the opening and closing of the bypass pipe.

[0024] In a preferred but non-limiting embodiment of the present invention, a tachometer is further included, mounted on compressor 5, for controlling compressor speed. A two-position, three-way control valve 8, Fb, is installed between the compressor exhaust pipe and the condenser inlet to control the opening and closing of the bypass pipe Ha.

[0025] Compared with the traditional refrigeration system, a bypass pipe is added to the compressor exhaust pipe and the return pipe, and the high-temperature exhaust gas of the compressor 5 is controlled to flow into the return pipe 2 by controlling the on-off of the control valve 8.

[0026] Example 2 Embodiment 2 of the present invention provides an air-cooled refrigerator, comprising the bypass heat exchange device of the air-cooled refrigerator of embodiment 1 above.

[0027] Example 3 Embodiment 3 of the present invention provides a heat exchange method, based on the bypass heat exchange device of the air-cooled refrigerator of the above embodiment, comprising: During the refrigerator startup phase, the normal refrigeration circuit and the anti-condensation circuit are activated simultaneously. The control valve 8 opens, and most of the refrigerant flows back to the compressor 5 through the bypass pipe 3. The high-temperature and high-pressure gas refrigerant in the bypass pipe 3 exchanges heat with the low-temperature and low-pressure liquid refrigerant in the return pipe 2, thereby increasing the temperature of the refrigerant in the return pipe 2. When the opening time of the control valve 8 reaches the preset time threshold t2, the control valve 8 is closed, the bypass pipe 3 stops working, the anti-condensation circuit is closed, and only the normal refrigeration circuit is enabled.

[0028] The embodiment of the present invention further provides a refrigerant flow path: divided into a first circuit normal refrigeration circuit and a second circuit anti-condensation circuit, specifically: The first circuit is a normal refrigeration circuit, and the refrigerant flow path is: compressor 5 → control valve 8 → condenser 13 → anti-condensation tube 12 → filter 4 → capillary tube 11 → evaporator 9 → return air pipe 2 → compressor 5; The second circuit is an anti-condensation circuit in the startup phase, and the flow path of the refrigerant is: compressor 5 → control valve 8 → bypass pipe 3 → compressor 5.

[0029] The first circuit and the second circuit are connected in parallel and switched to operate via the control valve 8 .

[0030] Example 4 like Figure 3 FIG. 4 is a flow chart of a control valve control method according to an embodiment of the present invention. Embodiment 4 of the present invention provides a bypass heat exchange control method, including: After the refrigerator is powered on, the compressor 5 starts running, and the refrigerant circulates in the normal refrigeration circuit. The temperature and humidity values ​​collected by the arranged temperature and humidity sensor 1 are compared with the set parameters to determine whether the control valve is open. If there is an opening request, the control valve is opened immediately; the refrigerant flow path follows the first circuit and the second circuit are simultaneously connected and flow; if not, the control valve is immediately closed; the refrigerant flow path follows the first circuit and the second circuit is closed.

[0031] If the return air pipe temperature is low and remains below this temperature for an extended period, condensation may occur in the return air pipe section. Traditionally, this can be avoided by reducing the compressor startup speed to slowly withdraw refrigerant from the evaporator. However, since the compressor startup speed is already at its lowest, the only option is to activate the anti-condensation piping to raise the return air pipe temperature.

[0032] The opening and closing of the control valve Fb depends on the preset values ​​of the humidity sensor Ts, the temperature sensor Tb, the dew point temperature Tp and the compressor starting speed Th.

[0033] The opening conditions of the control valve 8 are: the return air pipe surface temperature Tp≤the preset dew point temperature Td, and the time t that the return air pipe temperature is lower than the dew point temperature is lower than the preset time t1.

[0034] The closing conditions of the control valve 8 are: the return pipe surface temperature > the preset return pipe surface temperature value Tp1, or the time when the return pipe temperature is lower than the dew point temperature > the preset time t1 below the dew point temperature, or the control valve opening time > the preset opening time t2.

[0035] To further correlate control valve opening, if the return pipe temperature falls below preset value 1 and remains low for longer than preset value 2, the compressor startup speed is reduced to its minimum speed for 5 minutes, and the control valve opens. Once the temperature rises above preset value 1, the control valve closes. The dew point temperature is predicted using a temperature and humidity sensor, and the return pipe surface temperature is measured using a temperature sensor. A tachometer controls the compressor startup speed. During the refrigerator's on / off cycle, especially at startup, if the return pipe surface temperature falls below the dew point, condensation will form within a short period of time. This causes control valve Fb to open. When control valve Fb is open, most of the refrigerant flows back to the compressor through bypass pipe Ha. The high-temperature, high-pressure gas refrigerant in bypass pipe Ha exchanges heat with the low-temperature, low-pressure liquid refrigerant in the return pipe, raising the refrigerant temperature in the return pipe. Simultaneously, when the compressor operates at a low speed, cooling capacity decreases, the evaporation temperature increases, and the return pipe surface temperature rises. The control valve is open for a time t1. After this time, control valve Fb closes, bypass pipe Ha stops operating, and the system returns to normal refrigeration.

[0036] In a preferred but non-limiting embodiment of the present invention, taking BCD-290W as an example, the refrigerator operates at 32°C 75% environment, and the compressor is started at a low speed Th. The surface temperature of the return air pipe drops from 30°C to -5°C at the moment of startup, and then returns to zero after maintaining for 2 minutes. When the control valve is opened, the surface temperature rises to 28.5°C and stabilizes. When the compressor stops, the temperature rises to above 30°C.

[0037] The corresponding relationships are shown in the following table: Table 1 Correspondence between preset values ​​and refrigeration flow paths

[0038] Wherein, Ts is the ambient temperature detected by the ring temperature sensor, Ts1 is the preset ambient temperature threshold; Tb is the internal humidity of the refrigerator, Tb1 is the preset internal humidity threshold of the refrigerator; Tp is the surface temperature of the return air pipe, Tp1 is the preset surface temperature threshold of the return air pipe; Th is the compressor speed; t1 is the preset threshold of the time when the return air pipe temperature is lower than the dew point temperature; t2 is the control valve opening time.

[0039] Embodiment 5 Material selection: The bypass pipe 3 and the return air pipe 2 can be made of different materials such as copper pipe or stainless steel pipe in addition to aluminum foil wrapping to improve heat exchange efficiency.

[0040] The present disclosure can be a system, a method, and / or a computer program product. The computer program product can include a computer readable storage medium (or media) having computer readable program instructions thereon for causing a processor to carry out aspects of the present disclosure.

[0041] The computer readable storage medium can be a tangible device that can retain and store instructions for use by an instruction execution device. The computer readable storage medium can be, for example, but is not limited to, an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium include the following: a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), a static random access memory (SRAM), a portable compact disc read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanically encoded device such as punch-cards or punched-tape, and any suitable combination of the foregoing. A computer readable storage medium, as used herein, is not to be construed as being transitory signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through a waveguide or other transmission media (e.g., light pulses passing through a fiber-optic cable), or electrical signals transmitted through a wire.

[0042] Computer readable program instructions described herein can be downloaded to respective computing / processing devices from a computer readable storage medium or to an external computer or external storage device via a network, for example, the Internet, a local area network, a wide area network and / or a wireless network. The network can comprise copper transmission cables, optical transmission fibers, wireless transmission, routers, firewalls, switches, gateway computers and / or edge servers. A network adapter card or network interface in each computing / processing device receives computer readable program instructions from the network and forwards the computer readable program instructions for storage in a computer readable storage medium within the respective computing / processing device.

[0043] The computer program instructions for performing the operations of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The computer-readable program instructions may be executed entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, the state information of the computer-readable program instructions is used to personalize an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), so that the electronic circuit can execute the computer-readable program instructions, thereby implementing various aspects of the present disclosure.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A bypass heat exchange device for an air-cooled refrigerator, comprising a refrigeration system and a control system arranged inside the air-cooled refrigerator, characterized in that: The refrigeration system includes: Bypass pipe (3), compressor (5), return air pipe (2), evaporator (9), condenser (13), anti-condensation pipe (12), filter (4) and capillary tube (11); The compressor (5) includes a compressor body, a compressor exhaust pipe, and a compressor intake pipe; the compressor exhaust pipe and the compressor intake pipe are both connected to the compressor body; the return air pipe (2) is connected between the evaporator (9) and the compressor intake pipe, the bypass pipe (3) is connected between the return air pipe (2) and the compressor exhaust pipe, the condenser (13) is connected to the anti-condensation pipe (12), and is arranged between the compressor (5) and the filter (4); the capillary tube (11) connects the filter (4) and the evaporator (9).

2. The bypass heat exchange device for an air-cooled refrigerator according to claim 1, characterized in that: The bypass pipe (3) and the return air pipe (2) are both wrapped in aluminum foil for heat exchange.

3. The bypass heat exchange device for an air-cooled refrigerator according to claim 1, characterized in that: The control system includes a temperature and humidity sensor (1) and a control valve (8); The temperature and humidity sensor (1) is arranged inside the refrigerator, and the control valve (8) is arranged between the compressor exhaust pipe and the condenser (13) and is used to control the opening and closing of the bypass pipe.

4. The bypass heat exchange device for an air-cooled refrigerator according to claim 3, characterized in that: The temperature and humidity sensor (1) comprises a temperature sensor, a humidity sensor and an ambient temperature sensor; The humidity sensor and the ambient temperature sensor are arranged in the hinge box of the refrigerator, and the temperature sensor is arranged on the surface of the return air duct; the temperature sensor is used to collect the surface temperature of the return air duct; the humidity sensor is used to collect the humidity inside the refrigerator; and the ambient temperature sensor is used to collect the ambient temperature.

5. An air-cooled refrigerator, characterized in that: The invention comprises the bypass heat exchange device of an air-cooled refrigerator according to any one of claims 1 to 4.

6. A heat exchange method, using the bypass heat exchange device of the air-cooled refrigerator according to claim 3 or 4, characterized in that: include: During the start-up phase of the refrigerator, the normal refrigeration circuit and the anti-condensation circuit are activated simultaneously, the control valve (8) is opened, and most of the refrigerant flows back to the compressor (5) through the bypass pipe (3), and the high-temperature and high-pressure gas refrigerant in the bypass pipe (3) performs heat exchange with the low-temperature and low-pressure liquid refrigerant in the return pipe (2); When the opening time of the control valve (8) reaches a preset time threshold, the control valve (8) is closed, the bypass pipe (3) stops working, the anti-condensation circuit is closed, and only the normal refrigeration circuit is enabled.

7. The heat exchange method according to claim 6, characterized in that: The normal refrigeration circuit and the anti-condensation circuit are connected in parallel and switched to operate via the control valve (8).

8. The heat exchange method according to claim 7, characterized in that: In the normal refrigeration circuit, the refrigerant flow path is: compressor (5) → control valve (8) → condenser (13) → anti-condensation tube (12) → filter (4) → capillary tube (11) → evaporator (9) → return air pipe (2) → compressor (5); In the anti-condensation circuit, the refrigerant flow path is: compressor (5) → control valve (8) → bypass pipe (3) → compressor (5).

9. The heat exchange method according to claim 6, characterized in that: The opening condition of the control valve (8) is: the surface temperature of the return air pipe is less than or equal to the preset dew point temperature, and the time when the return air pipe temperature is lower than the dew point temperature is less than or equal to the preset time when the temperature is lower than the dew point temperature; The closing condition of the control valve (8) is: the return air pipe surface temperature > the preset return air pipe surface temperature value, or the time when the return air pipe temperature is lower than the dew point temperature > the preset time when the temperature is lower than the dew point temperature, or the control valve opening time > the preset opening time.

10. A terminal comprising a processor and a storage medium; characterized in that: The storage medium is used to store instructions; The processor is configured to operate according to the instructions to execute the steps of the method according to any one of claims 6 to 9.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 6 to 9 are implemented.

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