Graded regulation and control refrigeration system and refrigeration equipment

Abstract

The utility model relates to the technical field of refrigerating systems, and provides a graded regulation and control refrigerating system which comprises a compressor, a condenser and a two-stage refrigerating assembly which are sequentially and circularly connected. The two-stage refrigeration assembly comprises a refrigeration evaporator, a first-stage throttling element and a second-stage throttling element, the first-stage control valve is respectively connected with the condenser and the first-stage throttling element; the second-stage control valve is connected with the second-stage throttling element and the freezing evaporator; the inlet of the freezing evaporator is also connected with the first-stage throttling element which is connected with the first-stage control valve, and the outlet of the freezing evaporator is connected with the compressor through an air return pipe. Therefore, the two stages of refrigeration assemblies are arranged, and the refrigerant is throttled twice, so that different refrigeration temperatures are obtained at different evaporators. The target temperature with the large temperature difference can be obtained in all the evaporators, the refrigeration requirements of all the evaporators are met, and meanwhile the refrigeration efficiency during operation mode switching is improved. The utility model further provides refrigeration equipment which is provided with the graded regulation and control refrigeration system.

Description

Technical Field

[0001] The utility model belongs to the technical field of refrigeration systems, and particularly relates to a multi-gear adjustable refrigeration system and a refrigeration device. Background Art

[0002] Evaporators of each compartment in a multi-system refrigerator are mostly arranged in a series-parallel manner, and a single capillary tube is used for each path. When the refrigerating chamber and the freezing chamber are cooled simultaneously, the evaporation pressures and evaporation temperatures of the refrigerating evaporator and the freezing evaporator are basically the same. However, the difference between the target temperatures of the refrigerating chamber and the freezing chamber is relatively large. To ensure the refrigeration effect of the freezing chamber, the evaporation temperature is usually designed to be relatively low, which in turn reduces the overall efficiency of the system. Thus, the evaporation temperature of the refrigerating evaporator is also reduced, increasing the frosting amount on the refrigerating evaporator and also increasing the energy consumption for defrosting. At the same time, it will also cause the air flow temperature at the air outlet of the refrigerating chamber to be relatively low, resulting in the fruits and vegetables and other items stored at this position being frostbitten.

[0003] When switching the capillary tubes of different paths, it is necessary to re-stabilize the high and low pressures. It takes several minutes for the refrigerant to refill the new refrigeration circuit, and the refrigeration efficiency during this process is low, increasing the overall energy consumption of the system. At the same time, at the beginning of refrigeration in the refrigerating chamber, affected by the refrigerating temperature, the evaporation temperature of the freezing evaporator will increase, causing the temperature inside the freezing chamber to rise during the initial stage of refrigeration, increasing the temperature fluctuation.

[0004] Chinese Patent CN211823378U discloses a multi-system refrigeration control structure, which controls the conduction of each parallel path through a three-way valve. Although this structure can independently control the on-off of each path, when all compartments need to be refrigerated simultaneously, all paths need to be conducted. At this time, the evaporation pressures at both ends of each parallel path are the same, so the refrigeration temperatures of the evaporators of each path tend to the intermediate value, and the refrigeration temperature requirements of each compartment cannot be met.

[0005] In summary, it is obvious that the prior art has inconveniences and defects in actual use, so it is necessary to improve. Content of the Utility Model

[0006] Aiming at the above defects, the utility model mainly provides a multi-gear adjustable refrigeration system to solve the technical problem of coordinately controlling the different target refrigeration temperatures of each evaporator in a multi-system.

[0007] To solve the above problems, the utility model provides a multi-gear adjustable refrigeration system, which includes a compressor, a condenser and a two-stage refrigeration component connected in sequence and cyclically;

[0008] The two-stage refrigeration component includes:

[0009] A refrigerating evaporator, the two ends of which are respectively connected to a first-stage throttling member and a second-stage throttling member;

[0010] The first-stage control valve is respectively connected to the condenser and the first-stage throttling element;

[0011] The second-stage control valve is connected to the second-stage throttling element and the refrigeration evaporator;

[0012] The inlet of the refrigeration evaporator is also connected to a first-stage throttling element, and this first-stage throttling element is connected to the first-stage control valve. The outlet is connected to the compressor through a return air pipe.

[0013] According to the step-less control refrigeration system of the present invention, the two-stage refrigeration assembly further includes:

[0014] A variable-temperature evaporator, with its two ends respectively connected to the first-stage throttling element and the second-stage throttling element; the first-stage throttling element is also connected to the first-stage control valve, and the second-stage throttling element is also connected to the second-stage control valve.

[0015] According to the step-less control refrigeration system of the present invention, the first-stage throttling element is a capillary tube; the diameters of the three capillary tubes respectively connected to the refrigerated evaporator, the variable-temperature evaporator, and the refrigeration evaporator decrease in sequence and / or the lengths increase in sequence.

[0016] According to the step-less control refrigeration system of the present invention, both the first-stage control valve and the second-stage control valve are solenoid valves.

[0017] According to the step-less control refrigeration system of the present invention, the first-stage throttling element is heat-exchange connected to the return air pipe.

[0018] According to the step-less control refrigeration system of the present invention, the first-stage throttling element is a capillary tube; the capillary tube is arranged in parallel with the return air pipe, and the two are connected through a plurality of solder joints.

[0019] According to the step-less control refrigeration system of the present invention, the condenser is also connected in series with an anti-condensation tube.

[0020] According to the step-less control refrigeration system of the present invention, the condenser is also connected to a dryer filter.

[0021] A refrigeration device has the step-less control refrigeration system described above.

[0022] According to the refrigeration device of the present invention, the refrigeration device is a refrigerator or a freezer.

[0023] In summary, the step-less control refrigeration system of the present invention, by setting a two-stage refrigeration assembly and throttling the refrigerant twice, realizes different refrigeration temperatures at different evaporators. It can obtain target temperatures with a large temperature difference at each evaporator, meet the refrigeration requirements of each evaporator, and at the same time improve the refrigeration efficiency during the operation mode switching. The present invention also provides a refrigeration device having the step-less control refrigeration system described above. Description of the Drawings

[0024] Figure 1 It is a schematic structural diagram of an embodiment of the multi - stage adjustable control refrigeration system of the present utility model;

[0025] Figure 2 is Figure 1 a schematic diagram of the principle of an operating mode of the embodiment;

[0026] Figure 3 It is a schematic structural diagram of an embodiment of the multi - stage adjustable control refrigeration system of the present utility model;

[0027] Figure 4 is Figure 3 a schematic diagram of the principle of an operating mode of the embodiment;

[0028] Figure 5 is Figure 3 a schematic diagram of the principle of an operating mode of the embodiment;

[0029] Figure 6 It is a schematic structural diagram of an embodiment of the heat exchange connection structure of the present utility model;

[0030] In the figure: 1 - compressor, 11 - condenser, 12 - anti - dew tube, 13 - drier filter, 14 - suction pipe, 15 - solder joint; 2 - refrigerated evaporator, 21 - primary throttle element, 22 - secondary throttle element, 23 - primary control valve, 24 - secondary control valve; 3 - freezer evaporator, 4 - variable - temperature evaporator. Detailed implementation manners

[0031] Referring to Figure 1 , the present utility model provides a multi - stage adjustable control refrigeration system, including a compressor 1, a condenser 11 and two - stage refrigeration components connected in sequence and in a cycle;

[0032] Embodiment 1:

[0033] The two - stage refrigeration components include:

[0034] a refrigerated evaporator 2, with its two ends respectively connected to a primary throttle element 21 and a secondary throttle element 22;

[0035] a primary control valve 23, respectively connected to the condenser 11 and the primary throttle element 21;

[0036] a secondary control valve 24, connected to the secondary throttle element 22 and the freezer evaporator 3;

[0037] The inlet of the freezer evaporator 3 is connected to a primary throttle element 2, and this primary throttle element 2 is connected to the primary control valve 23, and the outlet is connected to the compressor 1 through a suction pipe 14;

[0038] As an operating mode of the refrigeration system of the present utility model, when the refrigerating evaporator 2 and the freezing evaporator 3 refrigerate simultaneously:

[0039] The first-stage control valve 23 shuts off the first-stage throttling member 2 connecting to the freezing evaporator 3 and conducts the first-stage throttling member 2 connecting to the refrigerating evaporator 2; the second-stage control valve 24 conducts the second-stage throttling member 22 connecting to the refrigerating evaporator 2;

[0040] After being throttled by the first-stage throttling member 2, the refrigerant enters the refrigerating evaporator 2 to vaporize and absorb heat, achieving refrigerating for the refrigerating compartment;

[0041] After that, the refrigerant is throttled by the second-stage throttling member 22 and then enters the freezing evaporator 3 to vaporize and absorb heat, achieving refrigerating for the freezing compartment.

[0042] During the whole refrigeration process, the refrigerant undergoes two-stage throttling, so different evaporation pressures can be formed at both ends of the refrigerating evaporator 2 and the freezing evaporator 3 respectively. Furthermore, different refrigeration temperatures can be achieved at the refrigerating evaporator 2 and the freezing evaporator 3 respectively to meet the refrigeration requirements of their respective compartments.

[0043] Optionally, those skilled in the art can select appropriate throttling devices so that after being throttled by the first-stage throttling member 2, the refrigerant can obtain a refrigeration temperature of about 0 - 5 °C at the refrigerating evaporator 2 to meet the refrigeration needs of the refrigerating compartment. This can avoid the phenomenon of freezing of fruit and vegetable ingredients, and reduce the frosting amount of the refrigerating evaporator 2, reducing the defrosting frequency and energy consumption.

[0044] After that, the refrigerant is throttled by the second-stage throttling member 22 again and can obtain a refrigeration temperature below -18 °C at the freezing evaporator 3 to meet the needs of frozen storage.

[0045] Through one cycle, the present utility model can reach different refrigeration temperatures at different evaporators respectively to meet the refrigeration requirements of each evaporator.

[0046] See Figure 2 , as an operating mode of the refrigeration system of the present utility model, when the refrigerating evaporator 2 stops refrigerating and the freezing evaporator 3 needs to refrigerate:

[0047] The first-stage control valve 23 conducts the first-stage throttling member 2 connecting to the freezing evaporator 3 and shuts off the first-stage throttling member 2 connecting to the refrigerating evaporator 2; the second-stage control valve 24 shuts off the second-stage throttling member 22 connecting to the refrigerating evaporator 2;

[0048] The refrigerant directly enters the freezing evaporator 3 through the first-stage throttling member 2 to achieve refrigerating for the freezing compartment.

[0049] When Figure 1 the shown operating mode changes to Figure 2When the operating mode is switched, part of the refrigerant is sealed in the refrigerating evaporator 2. When the two modes are switched again, the refrigerant sealed in the refrigerating evaporator 2 before can quickly fill the circuit, improving the refrigeration efficiency during mode switching.

[0050] As a preferred solution, the condenser 11 of the present utility model is further connected to a dryer filter 13, which removes moisture, impurities, etc. in the residual gas in the pipeline during the refrigeration cycle, avoiding blocking the throttling element.

[0051] As a preferred solution, the condenser 11 is further connected in series with an anti-condensation pipe 12; to avoid condensation water at the connection position between the box body and the door body of the refrigeration equipment.

[0052] Embodiment 2:

[0053] See Figure 3 , the two-stage refrigeration assembly further includes:

[0054] A variable-temperature evaporator 4, with its two ends respectively connected to a first-stage throttling element 21 and a second-stage throttling element 22; the first-stage throttling element 21 is further connected to a first-stage control valve 23, and the second-stage throttling element 22 is further connected to a second-stage control valve 24;

[0055] As an operating mode of the refrigeration system of the present utility model, when the refrigerating evaporator 2, the variable-temperature evaporator 4, and the freezing evaporator 3 refrigerate simultaneously:

[0056] The first-stage control valve 23 shuts off the first-stage throttling element 2 connected to the freezing evaporator 3 and conducts the two first-stage throttling elements 2 connected to the refrigerating evaporator 2 and the variable-temperature evaporator 4; the second-stage control valve 24 conducts the two second-stage throttling elements 22 connected to the refrigerating evaporator 2 and the variable-temperature evaporator 4;

[0057] The refrigerant is divided into two paths, and after being throttled by their respective first-stage throttling elements 2 respectively, it enters the refrigerating evaporator 2 and the variable-temperature evaporator 4 to vaporize and absorb heat, realizing refrigerating refrigeration and variable-temperature refrigeration;

[0058] After that, the two paths of refrigerant are throttled by their respective second-stage throttling elements 22 respectively, converge at the second-stage control valve 24, and enter the freezing evaporator 3 to vaporize and absorb heat, realizing freezing refrigeration.

[0059] In this operating mode, the required refrigeration temperatures can be obtained at the refrigerating evaporator 2, the variable-temperature evaporator 4, and the freezing evaporator 3 respectively. And it can achieve the target temperatures with a large temperature difference at each evaporator, meeting the requirement of simultaneous refrigeration of the three systems.

[0060] The present utility model can select a suitable first-stage throttling element 21 according to the types and refrigeration temperatures of each evaporator.

[0061] Further, the primary throttling member 21 of the present utility model is a capillary tube; the flow rates of the three capillary tubes respectively connected to the refrigerating evaporator 2, the variable-temperature evaporator 4, and the freezing evaporator 3 decrease in sequence; different throttling effects can be achieved to adapt to the refrigerating temperatures of each evaporator. As an implementation manner, for the three capillary tubes of the present utility model, the flow rate can be decreased in sequence by decreasing the tube diameter in sequence or increasing the length in sequence. Or both methods can be used simultaneously.

[0062] See Figure 4 , as an operation mode of the refrigeration system of the present utility model, when the refrigerating evaporator 2 does not refrigerate; and the variable-temperature evaporator 4 and the freezing evaporator 3 refrigerate simultaneously:

[0063] The primary control valve 23 shuts off the primary throttling member 2 connected to the freezing evaporator 3, shuts off the primary throttling member 2 connected to the refrigerating evaporator 2, and conducts the primary throttling member 2 of the variable-temperature evaporator 4; the secondary control valve 24 shuts off the secondary throttling member 22 connected to the refrigerating evaporator 2 and conducts the secondary throttling member 22 connected to the variable-temperature evaporator 4;

[0064] After the refrigerant is throttled by the primary throttling member 2, it enters the variable-temperature evaporator 4 to vaporize and absorb heat, achieving variable-temperature refrigeration;

[0065] After that, the refrigerant is throttled by the secondary throttling member 22 and enters the freezing evaporator 3 through the secondary control valve 24 to vaporize and absorb heat, achieving freezing refrigeration.

[0066] This mode can open or shut off a certain path through the primary control valve 23 and the secondary control valve 24 according to the actual refrigeration requirements of each evaporator.

[0067] See Figure 5 , as an operation mode of the refrigeration system of the present utility model, when both the refrigerating evaporator 2 and the variable-temperature evaporator 4 do not refrigerate; and only the freezing evaporator 3 refrigerates:

[0068] The primary control valve 23 conducts the primary throttling member 2 connected to the freezing evaporator 3 and shuts off the two primary throttling members 2 connected to the refrigerating evaporator 2 and the variable-temperature evaporator 4; the secondary control valve 24 shuts off the two secondary throttling members 22 connected to the refrigerating evaporator 2 and the variable-temperature evaporator 4;

[0069] The refrigerant directly enters the freezing evaporator 3 through the primary throttling member 2 to achieve freezing refrigeration.

[0070] Those skilled in the art can combine the foregoing operation modes to implement a predetermined refrigeration control strategy.

[0071] Optionally, as a control strategy, the Figure 4 operation mode can be adopted first, and when the temperature in the refrigerating chamber reaches the standard, the Figure 5operating mode; when the temperatures of the refrigerating chamber and the variable-temperature chamber both reach the standard, then adopt Figure 6 operating mode. If the temperature of the refrigerating chamber or the variable-temperature chamber rises beyond the threshold value, it can be switched back to Figure 4 or Figure 5 operating mode to adapt to the actual refrigeration control requirements.

[0072] When switching between the above operating modes, in the shut-off circuit, part of the refrigerant will be sealed in the refrigerating evaporator 2 and / or the variable-temperature evaporator 4. When the mode is switched and the circuit is re-conducted, the sealed refrigerant can quickly fill the circuit, improving the refrigeration efficiency when the operating mode is switched.

[0073] The switching of the operating mode only needs to control the on-off operation of a certain path by the first-stage control valve 23 and / or the second-stage control valve 24. The control method and control logic are simple and easy to implement, and are not prone to errors. Optionally, both the first-stage control valve 23 and the second-stage control valve 24 are solenoid valves, and the control performance is good.

[0074] As an embodiment, the first-stage throttling member 21 of the present utility model is heat-exchange connected to the return air pipe 14; the heat-exchange connection is configured to: use the high-temperature liquid refrigerant in the first-stage throttling member 21 to vaporize the residual liquid refrigerant in the return air pipe 14; prevent the compressor 1 from inhaling liquid refrigerant and causing a liquid hammer phenomenon.

[0075] According to the well-known refrigerator structure, a section of the return air pipe 14 connecting to the compressor 1 is usually exposed to the external air. By using the heat-exchange connection, the temperature of the gaseous refrigerant in the return air pipe 14 can also be close to room temperature, preventing condensation from forming on the outer wall of this section of the pipeline.

[0076] See Figure 6 , as an embodiment of the heat-exchange connection, the first-stage throttling member 21 of the present utility model is a capillary tube; the capillary tube is arranged in parallel with the return air pipe 14, and the two are connected by a plurality of solder joints 15; the solder joints 15 can be formed by soldering, and heat is conducted between the two through the solder joints 15.

[0077] Optionally, the capillary tube of the present utility model can also be arranged in parallel and closely attached to the return air pipe 14, and then aluminum foil is wound outside; heat is transferred through the fitting part of the capillary tube and the return air pipe 14 and the aluminum foil to form a heat-exchange connection.

[0078] Optionally, the second-stage throttling member 22 of the present utility model is also a capillary tube.

[0079] The step-controlled refrigeration system of the present utility model realizes different refrigeration temperatures at different evaporators by setting two-stage refrigeration components and throttling the refrigerant twice. Different target temperatures with a large temperature difference can be obtained at each evaporator to meet the refrigeration requirements of each evaporator.

[0080] The present utility model also provides a refrigeration device, which has the step-regulated refrigeration system described above.

[0081] Optionally, the refrigeration device of the present utility model is a refrigerator or a freezer.

[0082] In summary, the present utility model provides a step-regulated refrigeration system. By setting two-stage refrigeration components and throttling the refrigerant twice, different refrigeration temperatures are obtained at different evaporators. Different target temperatures with a large temperature difference can be obtained at each evaporator to meet the refrigeration requirements of each evaporator, and at the same time, the refrigeration efficiency during the operation mode switching is improved. The present utility model also provides a refrigeration device, which has the step-regulated refrigeration system described above.

[0083] Certainly, the present utility model can also have many other embodiments. Without departing from the spirit and essence of the present utility model, those skilled in the art can make various corresponding changes and deformations according to the present utility model. However, these corresponding changes and deformations should all fall within the protection scope of the appended claims of the present utility model.

Claims

1. A step-controlled refrigeration system, characterized in that: It includes a compressor, a condenser and a two-stage refrigeration assembly which are connected in a cycle in sequence; The two-stage refrigeration assembly comprises: A refrigeration evaporator, with a primary throttling device and a secondary throttling device connected to both ends thereof; A primary control valve, connected to the condenser and the primary throttling element respectively; A secondary control valve, connected to the secondary throttling element and the refrigeration evaporator; The inlet of the refrigeration evaporator is also connected to a primary throttling device, and the primary throttling device is connected to the primary control valve, and the outlet is connected to the compressor through a return air pipe.

2. The step-controlled refrigeration system according to claim 1, characterized in that: The two-stage refrigeration assembly also includes: The temperature-variable evaporator has two ends respectively connected to a primary throttling element and a secondary throttling element; the primary throttling element is also connected to a primary control valve, and the secondary throttling element is also connected to a secondary control valve.

3. The step-controlled refrigeration system according to claim 2, characterized in that: The primary throttling element is a capillary tube; the diameters of the three capillary tubes respectively connected to the refrigeration evaporator, the temperature-variable evaporator and the freezing evaporator decrease in sequence and / or their lengths increase in sequence.

4. The step-controlled refrigeration system according to claim 1, characterized in that: The primary control valve and the secondary control valve are both solenoid valves.

5. The step-controlled refrigeration system according to claim 1, characterized in that: The primary throttling element is connected to the return air pipe for heat exchange.

6. The step-controlled refrigeration system according to claim 5, characterized in that: The first-level throttling element is a capillary tube; the capillary tube and the return air pipe are arranged in parallel, and the two are connected through a plurality of welding points.

7. The step-controlled refrigeration system according to claim 1, characterized in that: The condenser is also connected in series with an anti-dew pipe.

8. The step-controlled refrigeration system according to claim 7, characterized in that: The condenser is also connected to a drying filter.

9. A refrigeration device, characterized in that: A step-controlled refrigeration system is provided according to any one of claims 1 to 8.

10. The refrigeration device according to claim 9, characterized in that: The refrigeration equipment is a refrigerator or a freezer.

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