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

Abstract

A bypass heat exchange device, refrigerator, method, terminal, and medium for a frost-free refrigerator are disclosed, comprising: a bypass pipe, a compressor, a return pipe, an evaporator, a condenser, an anti-condensation pipe, a filter, and a capillary tube. The compressor includes a compressor body, a compressor discharge pipe, and a compressor suction pipe; both the compressor discharge pipe and the compressor suction pipe are connected to the compressor body. The return pipe connects the evaporator and the compressor suction pipe, the bypass pipe connects the return pipe and the compressor discharge pipe, the condenser is connected to the anti-condensation pipe, and is positioned between the compressor and the filter. The capillary tube connects the filter and the evaporator. This invention addresses the problem of condensation on the surface of the return pipe during refrigerator startup by adding a bypass pipe and its related control mechanism to increase the temperature of the refrigerant in the return pipe, thereby reducing condensation. This invention also achieves more precise management of the refrigerator's refrigeration system through precise control of the valve's opening and closing.

Description

Technical Field

[0001] This invention belongs to the field of refrigerator refrigeration technology, and specifically relates to an improved bypass heat exchange device, refrigerator, and heat exchange method for an air-cooled refrigerator refrigeration system. Background Technology

[0002] A typical refrigeration system in a frost-free refrigerator consists of a compressor, condenser, anti-condensation tube, filter, capillary tube, evaporator, and return pipe. Heat exchange between the capillary tube and the return pipe is achieved through welding or aluminum foil wrapping to prevent condensation from forming on the return pipe surface when ambient humidity is high, thus affecting system reliability and user experience. However, during the refrigerator's start-up and shutdown cycles, especially during startup, the liquid refrigerant stored in the evaporator may cause condensation to appear on the return pipe surface for a short period, impacting system performance.

[0003] Existing technology discloses a hot gas defrosting system for a refrigerator and its control method, including a normal cooling mode and a hot gas defrosting mode. The hot gas defrosting mode includes two branches: high-temperature exhaust from the compressor defrosts the evaporator with hot gas, and the defrost is then cooled by heat exchange with the cooling branch before returning to the compressor after pressure regulation. However, the existing technology is lacking in that while the high-temperature exhaust from the compressor flows into the evaporator to melt the frost layer on the evaporator surface, it lacks measures to address condensation at the outlet section of the return gas pipe. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an improved bypass heat exchange device for a refrigeration system of an air-cooled refrigerator. The high-temperature exhaust gas mixes with the evaporator outlet pipe and flows back to the compressor, which does not affect the low-temperature refrigeration of the evaporator and can also increase the return gas temperature of the compressor, preventing condensation at the outlet pipe and reducing the occurrence of condensation inside the refrigerator.

[0005] The present invention adopts the following technical solution.

[0006] The first aspect of this invention provides a bypass heat exchange device for an air-cooled refrigerator, including a refrigeration system and a control system disposed inside the air-cooled refrigerator. The refrigeration system includes:

[0007] Bypass pipe, compressor, return pipe, evaporator, condenser, anti-condensation pipe, filter and capillary tube;

[0008] The compressor includes a compressor body, a compressor discharge pipe, and a compressor suction pipe; both the compressor discharge pipe and the compressor suction pipe are connected to the compressor body; the return pipe is connected between the evaporator and the compressor suction pipe; the bypass pipe is connected between the return pipe and the compressor discharge pipe; the condenser is connected to the anti-condensation pipe and is disposed between the compressor and the filter; the capillary tube connects the filter and the evaporator.

[0009] In one possible implementation, both the bypass pipe and the return pipe are wrapped with aluminum foil for heat exchange.

[0010] In one possible implementation, the control system includes a temperature and humidity sensor and a control valve;

[0011] The temperature and humidity sensor is located inside the refrigerator, and the control valve is located between the compressor exhaust pipe and the condenser to control the opening and closing of the bypass pipe.

[0012] In one possible implementation, the temperature and humidity sensor includes a temperature sensor, a humidity sensor, and an ambient temperature sensor;

[0013] The humidity sensor and the ambient temperature sensor are located inside the refrigerator hinge box, and the temperature sensor is located on the surface of the return gas pipe; the temperature sensor is used to collect the surface temperature of the return gas pipe; the humidity sensor is used to collect the humidity inside the refrigerator; and the ambient temperature sensor is used to collect the ambient temperature.

[0014] The second aspect of this invention discloses an air-cooled refrigerator.

[0015] This includes the aforementioned bypass heat exchange device for air-cooled refrigerators.

[0016] A third aspect of this invention discloses a heat exchange method using the aforementioned refrigerator.

[0017] During the refrigerator startup phase, the normal refrigeration circuit and the anti-condensation circuit are activated simultaneously. The control valve opens, allowing most of the refrigerant to flow back to the compressor through the bypass pipe. The high-temperature, high-pressure gaseous refrigerant in the bypass pipe exchanges heat with the low-temperature, low-pressure liquid refrigerant in the return pipe.

[0018] When the opening time of the control valve reaches a preset time threshold, the control valve closes, the bypass pipe stops working, the anti-condensation circuit is shut down, and only the normal refrigeration circuit is activated.

[0019] In one possible implementation, the normal refrigeration circuit and the anti-condensation circuit are connected in parallel and switched between operation via the control valve.

[0020] In one possible implementation, the normal refrigeration circuit has the following refrigerant flow path: compressor → control valve → condenser → anti-condensation tube → filter → capillary tube → evaporator → return gas tube → compressor.

[0021] The refrigerant flow path in the anti-condensation circuit is: compressor → control valve → bypass pipe → compressor.

[0022] In one possible implementation, the control valve opening condition is: the surface temperature of the return pipe is ≤ the preset dew point temperature, and the time when the temperature of the return pipe is lower than the dew point temperature is ≤ the preset time when it is lower than the dew point temperature.

[0023] The control valve closing conditions are: the surface temperature of the return pipe is greater than the preset surface temperature value of the return pipe, or the time during which the return pipe temperature is lower than the dew point temperature is greater than the preset time during which the temperature is lower than the dew point temperature, or the control valve opening time is greater than the preset opening time.

[0024] A fourth aspect of the present invention discloses a terminal, including a processor and a storage medium;

[0025] The storage medium is used to store instructions;

[0026] The processor is configured to operate according to the instructions to perform the steps according to the method described above.

[0027] The fifth aspect of this invention discloses a computer-readable storage medium having a computer program stored thereon.

[0028] When the program is executed by the processor, it implements the steps of the above method.

[0029] The beneficial effects of this invention are that, compared with the prior art,

[0030] (1) The bypass heat exchange device proposed in this invention effectively avoids the phenomenon of condensation in the return pipe during the initial start-up of the refrigerator, thereby improving the stability of the system and user satisfaction.

[0031] (2) This invention achieves more refined management of the refrigerator refrigeration system by precisely controlling the opening and closing of the valve;

[0032] (3) In view of the problem of condensation on the surface of the return pipe during the start-up phase of the refrigerator, the present invention increases the temperature of the refrigerant in the return pipe by adding a bypass pipe and its related control mechanism, thereby reducing the occurrence of condensation. Attached Figure Description

[0033] Figure 1 A schematic diagram of an air-cooled refrigerator provided in an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of a refrigeration system for a wind-cooled refrigerator provided in an embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram of the control logic of the control valve provided in an embodiment of the present invention.

[0036] In the picture,

[0037] 1-Temperature and humidity sensor, 2-Return pipe, 3-Bypass pipe, 4-Filter, 5-Compressor, 6-Suction pipe, 7-Exhaust pipe, 8-Control valve, 9-Evaporator, 10-Return heat exchange section, 11-Capillary tube, 12-Anti-condensation tube, 13-Condenser. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. The embodiments described in this application are merely some embodiments of this invention, and not all embodiments. Based on the spirit of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this invention.

[0039] Example 1

[0040] 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. The refrigerator body is provided with several compartments, and the refrigeration system and the control system are both located inside the refrigerator body.

[0041] The refrigeration system includes a bypass pipe 3, a compressor 5, a return pipe 2, an evaporator 9, a condenser 13, an anti-condensation pipe 12, a filter 4, and a capillary tube 11. The compressor 5 includes a compressor body, a compressor discharge pipe, and a compressor suction pipe. The compressor discharge pipe and the compressor suction pipe are both connected to the compressor body. The return pipe 2 is connected between the evaporator 9 and the compressor suction pipe. The bypass pipe 3 is connected between the return pipe 2 and the compressor discharge pipe. The condenser 13 is connected to the anti-condensation pipe 12 and is located between the compressor 5 and the filter 4. The capillary tube 11 connects the filter 4 and the evaporator 9.

[0042] The bypass pipe 3 is connected to the return pipe 2. Both the bypass pipe 3 and the return pipe 2 are wrapped with aluminum foil for heat exchange, which increases the temperature of the refrigerant in the return pipe.

[0043] 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 sensor and ambient temperature sensor are located inside the refrigerator, specifically within the refrigerator hinge box. The temperature sensor is located on the surface of the return pipe, at the evaporator inlet, and at the outlet. The temperature sensor is used to collect the surface temperature Tp of the return pipe 2; the humidity sensor is used to collect the internal humidity Tb of the refrigerator; and the ambient temperature sensor is used to collect the ambient temperature Ts. The dew point temperature Td is predicted using the temperature and humidity sensors. The control valve 8 is located between the compressor exhaust pipe and the condenser 13 and is used to control the opening and closing of the bypass pipe.

[0044] In a preferred but non-limiting embodiment of the invention, a tachometer is also included, mounted on the compressor 5, for controlling the compressor speed. The control valve 8 is a two-position three-way valve; a two-position three-way valve Fb is installed between the compressor discharge pipe and the condenser inlet to control the opening and closing of the bypass pipe Ha.

[0045] Compared to traditional refrigeration systems, a bypass pipe is added to the compressor exhaust pipe and return pipe. The flow of high-temperature exhaust gas from the compressor 5 into the return pipe 2 is controlled by controlling the opening and closing of the control valve 8.

[0046] Example 2

[0047] Embodiment 2 of the present invention provides an air-cooled refrigerator, including the air-cooled refrigerator bypass heat exchange device of Embodiment 1 above.

[0048] Example 3

[0049] Embodiment 3 of the present invention provides a heat exchange method, based on the air-cooled refrigerator bypass heat exchange device of the above embodiments, comprising:

[0050] During the refrigerator startup phase, the normal refrigeration circuit and the anti-condensation circuit are activated simultaneously. Control valve 8 is opened, allowing most of the refrigerant to flow back to compressor 5 through bypass pipe 3. The high-temperature, high-pressure gaseous refrigerant in bypass pipe 3 exchanges heat with the low-temperature, low-pressure liquid refrigerant in return pipe 2, thereby increasing the temperature of the refrigerant in return pipe 2.

[0051] When the opening time of control valve 8 reaches the preset time threshold t2, control valve 8 closes, bypass pipe 3 stops working, the anti-condensation circuit is closed, and only the normal refrigeration circuit is activated.

[0052] This invention also provides a refrigerant flow path: divided into a first loop normal refrigeration loop and a second loop anti-condensation loop, specifically:

[0053] The first circuit is a 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 gas tube 2 → compressor 5.

[0054] The second circuit is an anti-condensation circuit during the startup phase. The refrigerant flow path is: compressor 5 → control valve 8 → bypass pipe 3 → compressor 5.

[0055] The first and second circuits are connected in parallel and switched by control valve 8.

[0056] Example 4

[0057] like Figure 3 The diagram shown is a control valve control flowchart in an embodiment of the present invention. Embodiment 4 of the present invention provides a bypass heat exchange control method, including:

[0058] 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 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 flows through the first circuit and the second circuit simultaneously. If not, the control valve is closed immediately. The refrigerant flows through the first circuit and closes the second circuit.

[0059] If the return pipe temperature is low and remains below a low temperature for an extended period, there is a risk of condensation on the return pipe section outside the evaporator. Traditionally, reducing the compressor's starting speed can slowly draw refrigerant back into the evaporator, preventing a sudden drop in pipe temperature. However, since the compressor's starting speed is already at its lowest, the only solution is to activate the anti-condensation line to raise the temperature of the pipe section outside the evaporator.

[0060] 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.

[0061] The opening conditions for the control valve 8 are: the surface temperature of the return gas pipe Tp ≤ the preset dew point temperature Td, and the time t for the return gas pipe temperature to be lower than the dew point temperature ≤ the preset time t1 for the temperature to be lower than the dew point temperature.

[0062] The closing conditions of the control valve 8 are: the surface temperature of the return pipe is greater than the preset surface temperature value of the return pipe Tp1, or the time when the temperature of the return pipe is lower than the dew point temperature is greater than the preset time t1 when it is lower than the dew point temperature, or the opening time of the control valve is greater than the preset opening time t2.

[0063] To further control the opening of the control valve, if the return pipe temperature is lower than preset value 1 and remains at a low temperature for longer than preset value 2, the compressor starting speed is reduced to the lowest speed and maintained for 5 minutes, while the control valve opens. Once the temperature rises above preset value 1, the control valve closes. The dew point temperature is predicted by a temperature and humidity sensor, the surface temperature of the return pipe is collected by a temperature sensor, and the compressor starting speed is controlled by a tachometer. During the refrigerator's start-stop cycle, especially at the moment of startup, the surface temperature of the return pipe is lower than the dew point temperature, and condensation will occur for a short time. In this case, control valve Fb opens. With control valve Fb open, most of the refrigerant flows back to the compressor through bypass pipe Ha. The high-temperature, high-pressure gaseous refrigerant in bypass pipe Ha exchanges heat with the low-temperature, low-pressure liquid refrigerant in the return pipe, increasing the temperature of the refrigerant in the return pipe. Simultaneously, as the compressor runs at a low speed, the cooling capacity decreases, the evaporation temperature increases, and the surface temperature of the return pipe rises. The control valve opening time is t1. After the time is reached, control valve Fb closes, bypass pipe Ha stops working, and the system returns to the normal refrigeration circuit.

[0064] In a preferred but non-limiting embodiment of the present invention, taking BCD-290W as an example, the refrigerator operates at 32°C and 75% humidity. The compressor starts at a low speed (Th). At the moment of startup, the surface temperature of the return pipe drops from 30°C to -5°C. After maintaining this temperature for 2 minutes, it rises back to zero. When the control valve opens, the surface temperature rises back to 28.5°C and stabilizes. When the compressor stops, the temperature rises back to above 30°C.

[0065] The corresponding relationships are shown in the table below:

[0066] Table 1. Correspondence between preset values ​​and refrigeration flow paths

[0067]

[0068] Where Ts is the ambient temperature detected by the ambient 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 pipe, Tp1 is the preset surface temperature threshold of the return pipe; Th is the compressor speed; t1 is the preset time threshold for the return pipe temperature to be lower than the dew point temperature; and t2 is the opening time of the control valve.

[0069] Example 5

[0070] Material selection: Bypass pipe 3 and return pipe 2 can be made of different materials other than aluminum foil wrapping, such as copper pipe or stainless steel pipe, to improve heat exchange efficiency.

[0071] This disclosure can be a system, method, and / or computer program product. A computer program product may include a computer-readable storage medium having computer-readable program instructions loaded thereon for causing a processor to implement various aspects of this disclosure.

[0072] Computer-readable storage media can be tangible devices capable of holding and storing instructions for use by an instruction execution device. Computer-readable storage media can be, for example—but not limited to—electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination of the foregoing. The computer-readable storage media used herein are not to be construed as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.

[0073] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0074] Computer program instructions used to perform the operations of this disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status 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++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving 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, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing the status information of the computer-readable program instructions to implement various aspects of this disclosure.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A heat exchange method employing a bypass heat exchange device for an air-cooled refrigerator, comprising a refrigeration system and a control system disposed inside the air-cooled refrigerator, the refrigeration system comprising: The system comprises a bypass pipe (3), a compressor (5), a return pipe (2), an evaporator (9), a condenser (13), an anti-condensation pipe (12), a filter (4), and a capillary tube (11); wherein, the compressor (5) includes a compressor body, a compressor discharge pipe, and a compressor suction pipe; the compressor discharge pipe and the compressor suction pipe are both connected to the compressor body; the return pipe (2) is connected between the evaporator (9) and the compressor suction pipe, the bypass pipe (3) is connected between the return pipe (2) and the compressor discharge pipe, and the condenser (13) The system is connected to the anti-condensation pipe (12) and is located between the compressor (5) and the filter (4); the capillary tube (11) connects the filter (4) and the evaporator (9); the bypass pipe (3) and the return pipe (2) are both wrapped with aluminum foil for heat exchange; the control system includes a temperature and humidity sensor (1) and a control valve (8); the temperature and humidity sensor (1) is located inside the refrigerator, and the control valve (8) is located between the compressor exhaust pipe and the condenser (13) for controlling the opening and closing of the bypass pipe; characterized in that it includes: During the refrigerator startup phase, 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). The high-temperature and high-pressure gaseous refrigerant in the bypass pipe (3) exchanges heat with the low-temperature and low-pressure liquid refrigerant in the return pipe (2). When the opening time of the control valve (8) reaches the preset time threshold, the control valve (8) closes, the bypass pipe (3) stops working, the anti-condensation circuit is closed, and only the normal refrigeration circuit is activated.

2. The heat exchange method according to claim 1, characterized in that: The normal refrigeration circuit and the anti-condensation circuit are connected in parallel and switched between operation by the control valve (8).

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

4. The heat exchange method according to claim 1, characterized in that: The opening conditions of the control valve (8) are: the surface temperature of the return pipe is ≤ the preset dew point temperature, and the time when the temperature of the return pipe is lower than the dew point temperature is ≤ the preset time when it is lower than the dew point temperature. The closing conditions of the control valve (8) are: the surface temperature of the return pipe is greater than the preset surface temperature value of the return pipe, or the time when the temperature of the return pipe is lower than the dew point temperature is greater than the preset time when it is lower than the dew point temperature, or the opening time of the control valve is greater than the preset opening time.

5. 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 perform the steps of the method according to any one of claims 1-4.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that: When executed by a processor, the program implements the steps of the method according to any one of claims 1-4.

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