Refrigeration appliance and refrigerant circuit for refrigeration appliance

Abstract

The invention relates to a refrigerant circuit for a refrigeration appliance, comprising: an evaporator having an input for supplying a refrigerant and an output for discharging the refrigerant; the input line is connected with the input end of the evaporator; a suction pipe, which is connected to the output of the evaporator, and which is connected to the input line in the heat exchanger section in a heat-conducting manner; and a temperature sensor for detecting a temperature of the refrigerant derived from the evaporator. In the heat exchanger section, the suction pipe has a measuring section, in which the suction pipe extends at a distance from the input line, and the temperature sensor is fastened to the measuring section in a thermally conductive manner.

Description

Technical Field

[0001] This invention relates to a refrigeration appliance, particularly a household refrigeration appliance, such as a refrigerator, freezer, or freezer box or refrigeration-freezing combination, and to a refrigerant circuit for the refrigeration appliance. Background Technology

[0002] In refrigeration appliances, heat is absorbed from a heat source and released to a heat exchanger via a refrigerant circuit. Typically, the refrigerant circulates through an evaporator and a liquefaction tank, where it evaporates in the evaporator while absorbing heat and condenses in the liquefaction tank while releasing heat. To allow the refrigerant to expand before entering the evaporator, an expansion valve is used, usually operated with so-called superheat regulation. This means controlling the flow rate of refrigerant through the expansion valve by taking into account the temperature difference between the temperature of the evaporated refrigerant after it exits the evaporator and the saturation temperature in the evaporator. However, especially in domestic refrigeration appliances, this superheat regulation is difficult to achieve due to the intermittent operation of the refrigerant circuit, as the temperature at the evaporator outlet undergoes significant fluctuations.

[0003] WO 2021 / 259630 A1 describes a household refrigeration appliance with a suction tube heat exchanger in which a suction tube from an evaporator assembly is thermally coupled to a supply line, wherein temperatures are determined at the input and output ends of the suction tube heat exchanger in order to determine the mass flow through the suction tube and the supply line.

[0004] Refrigerant circuits with expansion valves are described, for example, in KR 2003-0073944 A. Summary of the Invention

[0005] The objective of this invention is to provide an improved solution for determining the temperature of the refrigerant discharged from the evaporator in the refrigerant circuit.

[0006] According to the present invention, this task is accomplished by a refrigerant circuit having the features of claim 1 and by a refrigeration appliance having the features of claim 14.

[0007] According to a first aspect of the invention, a refrigerant circuit for a refrigeration appliance includes: an evaporator having an input end for supplying refrigerant and an output end for discharging refrigerant; an input line connected to the input end of the evaporator; a suction pipe connected to the output end of the evaporator, the suction pipe being thermally connected to the input line in a heat exchanger section; and a temperature sensor for detecting the temperature of the refrigerant discharged from the evaporator. In the heat exchanger section, the suction pipe has a measuring section in which the suction pipe extends spaced apart from the input line, wherein the temperature sensor is thermally secured to the measuring section.

[0008] Therefore, when operating the expansion valve with the aid of superheat regulation, the temperature can be measured, from which the temperature of the gaseous refrigerant at the evaporator outlet can be reliably determined without being disturbed by temperature fluctuations at the evaporator outlet.

[0009] Preferably, the present invention can be used in a refrigeration circuit having a compressor with a volumetric flow that can be adjusted in a variable manner.

[0010] According to a second aspect of the invention, a refrigeration appliance, particularly a household refrigeration appliance, includes a storage compartment for containing refrigerated items and a refrigerant circuit according to a first aspect of the invention, wherein an evaporator is thermally coupled to the storage compartment so as to absorb heat from the storage compartment in the event of refrigerant evaporation.

[0011] The concept upon which this invention is based is to detect the temperature of the gaseous refrigerant discharged from the evaporator, not directly after the evaporator, but in the region of the suction pipe heat exchanger. The suction pipe heat exchanger (also referred to herein as the heat exchanger section) is formed such that the suction pipe and the input line are thermally connected, for example, brazed together. Generally, the suction pipe and the input line are in thermal contact within the heat exchanger section. According to the invention, a measuring section is provided within this heat exchanger section, formed by a pipe section of the suction pipe that is spaced apart from the input line and therefore not in direct thermal contact. A temperature sensor is installed on this measuring section to detect the temperature of the refrigerant. Therefore, regarding the flow direction of the refrigerant in the suction pipe, the suction pipe has a pipe section upstream of and preferably also downstream of the measuring section that is thermally connected to the input line, for example, abutting against the input line.

[0012] Because hot refrigerant from the compressor or liquefier flows through the input line, the refrigerant flowing in the suction pipe from the evaporator is heated in the pipe section upstream of the measuring section. This smooths out temperature fluctuations in the refrigerant discharged from the compressor, facilitating the use of the temperature detected by the temperature sensor for control and regulation purposes.

[0013] By arranging the measurement section separately from the input line, the input line and the measurement section are essentially thermally isolated from each other. This improves the measurement accuracy of the temperature sensor.

[0014] Advantageous configurations and extensions are derived from the dependent claims that reference the independent claims in conjunction with the specification.

[0015] According to some implementation methods, the refrigeration appliance may be a household refrigeration appliance, such as a refrigerator, freezer, or freezer box, or a refrigeration and freezing combination.

[0016] According to some implementation methods, the refrigerant circuit may additionally include a compressor and a liquefier, wherein a suction pipe is connected to the suction port of the compressor, an input line is connected to the output terminal of the liquefier, and the input terminal of the liquefier is connected to the pressure port of the compressor.

[0017] According to some embodiments, the measurement section can be separated from the input line by a spacing retainer. The spacing retainer can be constructed, for example, by a plate-like member inserted between the input line and the measurement section, the plate-like member having engagement sections at its ends, each engagement section having a groove into which the suction tube and the input line are respectively placed. Alternatively, the spacing retainer can be constructed by a molded part, for example made of a foam material, such as EPS or a similar material, in which a first groove and a second groove extending spaced apart from the first groove are formed, wherein the input line is accommodated in the first groove and the measurement section of the suction tube is accommodated in the second groove. The spacing retainer can be formed, for example, by a heat-insulating material, such as plastic. The use of a spacing retainer provides the advantage of reliably separating the measurement section from the input line and allows for easy adjustment of a predetermined spacing between the measurement section and the input line.

[0018] According to some embodiments, the measuring section can be configured on a bend in the suction tube. The bend can, for example, be substantially U-shaped. Generally, the bend can have two connecting sections spaced apart along the input line, the connecting sections extending transversely to the input line and connecting to the measuring section, which can, for example, extend parallel to the input line. The bend in the suction tube can be advantageously and simply manufactured.

[0019] According to some embodiments, the input line can be configured as a bend surrounding the measuring section of the suction tube. This bend can, for example, be substantially arc-shaped. When using a spacing retainer, the spacing retainer can be coordinated with the arc-shaped guide of the input line and / or can have means for positioning and securing the temperature sensor.

[0020] According to some embodiments, the measuring section can be configured on the winding portion of the suction pipe. Therefore, the suction pipe can extend in a longitudinal section containing the measuring section in a manner that extends about an axis perpendicular to the input line. In this way, the area of ​​the input line within the heat exchanger section that does not contact the suction pipe can be shortened, which facilitates heat transfer to the refrigerant flowing in the suction pipe.

[0021] The diameter of the input line can be smaller than the diameter of the suction tube. This provides an option for additional pressure drop before the expansion valve.

[0022] In some implementations, the measurement section can be set to extend in a straight line. This facilitates the mounting of the temperature sensor on the suction tube.

[0023] According to some embodiments, the measuring section can be arranged with a gap between it and the input line, which is between 2 mm and 20 mm, particularly between 2 mm and 10 mm. Therefore, a very compact construction of the suction tube heat exchanger can still be achieved despite the suction tube being separated from the input line in the region of the measuring section. Furthermore, by spacing it within the aforementioned range, reliable thermal isolation between the measuring section and the input line is achieved.

[0024] According to some implementations, the measurement section along the suction pipe can be arranged with a distance between 50 mm and 500 mm from the evaporator outlet. That is, the length of the suction pipe from the evaporator outlet to the measurement point can be between 50 mm and 500 mm. This distance supplies energy to the suction gas, thereby increasing the temperature sensor reading relative to the superheated temperature directly at the evaporator outlet. The temperature sensor readings are highly stable and allow for adjustment to ensure complete filling of the evaporator with wet steam.

[0025] According to some embodiments, the refrigerant circuit can be configured with an expansion valve arranged in the input line between the heat exchanger section and the evaporator inlet, and this expansion valve can be controlled based on the temperature detected by a temperature sensor. Generally, the expansion valve is typically configured to expand the refrigerant flowing in the input line before entering the evaporator. Furthermore, the expansion valve can be configured to change the mass flow or flow rate of the refrigerant. To control the expansion valve, for example, to change the refrigerant flow rate, the temperature detected by the temperature sensor can be used. Since the temperature sensor is arranged in the measuring section within the heat exchanger section, the temperature detected by the temperature sensor is subject to weak fluctuations even when temperature fluctuations exist directly at the evaporator outlet; therefore, taking the temperature detected by the temperature sensor into account simplifies the control of the expansion valve.

[0026] According to some implementations, the expansion valve can be configured to control based on the temperature difference between the temperature detected by a temperature sensor and the saturation temperature in the evaporator. For example, the saturation temperature in the evaporator can be detected using an additional temperature sensor, or the saturation temperature can be determined based on the pressure detected in the evaporator.

[0027] According to some implementations, the expansion valve can be configured to increase the refrigerant flow rate as the temperature difference increases and decrease the refrigerant flow rate as the temperature difference decreases. An increased temperature difference means that the refrigerant absorbs a large amount of heat in the evaporator and is therefore intensely heated. Therefore, to ensure sufficient heat release in the evaporator, the refrigerant mass flow rate supplied to the evaporator is increased in response to the increased temperature difference. Similarly, a small temperature difference indicates that less heat is supplied to the evaporator, and the expansion valve reduces the refrigerant supply to the evaporator. To control the expansion valve based on the temperature difference to achieve this flow rate change, it is particularly advantageous to place a temperature sensor in the measuring section of the suction pipe, because the temperature measured there reliably follows the refrigerant temperature change at the evaporator outlet, but refrigerant temperature fluctuations, such as those occurring in intermittent operation of the refrigerant circuit, are reduced. This allows for more stable regulation of the expansion valve.

[0028] According to some implementation methods, the expansion valve can be configured as an electronic expansion valve.

[0029] According to some implementation methods, the temperature sensor can be configured as a PTC sensor, an NTC sensor, or a thermocouple.

[0030] According to some embodiments, the temperature sensor can be secured to the measuring section of the suction tube by means of fastening elements, such as clamps, adhesive tape, or the like. This facilitates installation and simultaneously improves the thermal contact between the suction tube and the temperature sensor.

[0031] According to some embodiments, the refrigeration appliance can be configured to have an insulating material that insulates the storage compartment, wherein at least one region of the measuring section, including the suction pipe, of the heat exchanger section is surrounded by the insulating material. For example, the container defining the storage compartment may be surrounded by an insulating foam material. A portion of the suction pipe heat exchanger, particularly the portion containing the measuring section of the suction pipe, may extend within the insulating material. This provides the advantage that the insulating effect of the insulating material, preferably also present between the measuring section and the input line, further improves the thermal decoupling between the measuring section and the input line.

[0032] Features and advantages disclosed in one aspect of the invention are also disclosed in the corresponding other aspect, and vice versa. Attached Figure Description

[0033] The invention will now be described with reference to the accompanying drawings. The drawings show: Figure 1 A simplified schematic perspective view of a refrigeration appliance according to an embodiment of the present invention is shown; Figure 2 A schematic block diagram of a refrigeration appliance having a refrigerant circuit according to an embodiment of the present invention is shown; Figure 3 A detailed view of the heat exchanger section of the refrigerant circuit according to an embodiment of the present invention is shown; Figure 4 A detailed diagram of the heat exchanger section of the refrigerant circuit according to another embodiment of the present invention is shown; and Figure 5 A schematic diagram showing the temperature sensor fixed on the suction tube of the refrigerant circuit according to an embodiment of the present invention.

[0034] In the accompanying drawings, unless otherwise stated, the same reference numerals denote the same or functionally equivalent parts. Detailed Implementation

[0035] Figure 1 An exemplary refrigeration appliance 200 in the form of a refrigerator is shown. However, the invention is not limited thereto, but can be used generally in refrigeration appliances, but especially in household refrigeration appliances, such as refrigerators, freezers or freezer boxes or refrigeration-freezing combinations.

[0036] like Figure 1 As schematically shown, the refrigeration appliance 200 may have a body 205 in which a storage compartment 210 for holding refrigerated items, such as food, beverages, medicines, or the like, is constructed. The storage compartment 210 may be limited or defined, for example, by an inner container 211, which may optionally be surrounded by insulation (not shown), particularly made of insulating foam. The body 205 further has an access opening 206 through which the storage compartment 210 can be accessed. Figure 1 As exemplarily shown, a door 215 may be hinged to the body 210, the door being movable between a closed position and an open position, in which the door covers the access opening 206, and in the open position, the door at least partially releases the access opening 206.

[0037] like Figure 2 As schematically shown, the refrigeration appliance 200 has a refrigerant circuit 100. The refrigerant circuit 100 is configured to absorb heat from the storage cell 210 when the refrigerant evaporates and to release heat to the environment when the refrigerant condenses. To absorb heat from the storage cell 210, the refrigerant circuit 100 has an evaporator 2 thermally coupled to the storage cell 210. (As shown...) Figure 2 As shown, the refrigerant circuit 100 may further include a compressor 1 and an evaporator 3, and optionally an expansion valve 6. Furthermore, the refrigerant circuit 100 includes a measurement and control system having a first temperature sensor 7, an optional additional sensor 8, and an optional control device 9.

[0038] like Figure 2As schematically shown, refrigerant is supplied to the evaporator 2 via input line 5 at input terminal 21. The refrigerant supplied to the evaporator 2 is discharged from the evaporator via output terminal 22, and suction pipe 4 is connected to this output terminal. Figure 2 As shown, the suction pipe 4 can be connected to the suction port 11 of the compressor 1. The input end 31 of the liquefier 3 is also connected to the pressure output end of the compressor 1, and the output end of the liquefier 3 is connected to the input end 21 of the evaporator 2 via the input line 5. An expansion valve 6 is arranged in the input line 5. Liquid refrigerant flows in the input line 5, expands in the expansion valve 6, and is supplied to the evaporator 2, where it evaporates while absorbing heat. The compressor 1 draws the evaporated gaseous refrigerant via the suction line or suction pipe 4, compresses the gaseous refrigerant, and delivers it to the liquefier, where it condenses while releasing heat to the environment. Then, the liquid refrigerant under the pressure generated by the compressor 1 is again supplied to the evaporator 2 via the input line 5 and the expansion valve 6.

[0039] like Figure 2 As schematically shown, the suction pipe 4 and the input line 5 are combined along a portion of their length to form a suction pipe heat exchanger or heat exchanger section 45. In the heat exchanger section 45, the suction pipe 4 and the input line 5 are at least partially in thermal contact with each other. For example, the suction pipe 4 and the input line may be abutting each other within the heat exchanger section 5. Figure 2 Only illustrative and as described below Figure 3 and Figure 4 As will be explained in more detail, the suction pipe 4 has a measuring section 41 in the heat exchanger section 45, in which the suction pipe 4 extends spaced apart from the input line 5. For example, the suction pipe 4 can be configured to have a first pipe section 41A and a second pipe section 41B in the heat exchanger section 45, the first pipe section being upstream of the measuring section 41 and in contact with the input line 5 with respect to the refrigerant flow direction in the suction pipe 4, and the second pipe section being downstream of the measuring section 41 and in contact with the input line 5 with respect to the refrigerant flow direction in the suction pipe 4, while the measuring section 41 itself does not directly contact the input line 5, but extends separately from it.

[0040] like Figure 3 and Figure 4 As illustrated schematically and purely by example, measurement section 41 may be a straight section of tubing, for example, extending parallel to the input line 5. Figure 3 As exemplarily shown, the measuring section 41 can be constructed on the bend 42 of the suction tube 4. Figure 3 The diagram merely illustrates a substantially U-shaped bend. Alternatively, the measuring section 41 could also be constructed on the winding portion 43 of the suction tube 4, as shown below. Figure 4This is purely exemplary and illustrative. Typically, the measuring section 41 is arranged spaced apart from the input line 5. The distance X between the measuring section 41 and the input line 5 can be, for example, between 2 mm and 20 mm, particularly between 2 mm and 10 mm. Optionally, at least one area of ​​the measuring section 41, including the suction pipe 4, of the heat exchanger section 45 can be surrounded by the insulation of the storage compartment 210. In this case, the distance X between the measuring section 41 and the input line 5 can be determined to be a relatively small size, for example, between 2 mm and 8 mm. However, a larger distance X between the measuring section 41 and the input line 5 is not excluded in this case.

[0041] In heat exchanger section 45, heat transfer occurs between the refrigerant flowing in suction pipe 4 and the refrigerant flowing in input line 5. The refrigerant flowing from liquefier 3 in input line 5 has a higher temperature than the refrigerant flowing from evaporator 2 in suction pipe 4. Therefore, the refrigerant flowing in suction pipe 4 is heated in the first pipe section 41A of suction pipe 4 before reaching measuring section 41. Measurements are taken along suction pipe 5, and measuring section 41 can be arranged, for example, with a distance between 50 mm and 500 mm from the output end 21 of evaporator 2.

[0042] like Figure 3 Furthermore, as exemplarily shown, the measurement section 41 can be separated from the input line 5 by a spacing retainer 44. For example... Figure 3 As exemplarily shown, the spacing retainer 44 may, for example, have a plate 44A extending between the measuring section 41 and the input line 5. A first receiving portion 44B for securing the input line 5 may be constructed at a first end of the plate 44A, and a second receiving portion 44C for securing the suction tube 4 may be constructed at a second end of the plate 44A. The first receiving portion 44B may, for example, be constructed as a locking groove, or as... Figure 3 As exemplarily shown, a section can be constructed that is foldable and can lock onto board 44A. This section is foldable (umklappbar) so that it surrounds the input line 5 and can lock onto the board. The second receiving portion 44C can, for example, be constructed as a flexible, arched section into which the suction tube 5 can be inserted together with the temperature sensor 7.

[0043] The first temperature sensor 7 can be, for example, a PTC sensor, an NTC sensor, or a thermocouple. Typically, the first temperature sensor 7 is thermally connected to the measuring section 41 of the suction tube 4 to detect the temperature of the refrigerant. For this purpose, the temperature sensor 7 is mounted on the outer periphery of the measuring section 41. For example, the temperature sensor 7 can be fastened to the measuring section 41 of the suction tube by means of a fastening element 71. For example, adhesive tape can be used as the fastening element 71. Figure 4As illustrated schematically and exemplary, the fastening element 71 may also be part of the optional spacing retainer 44, for example, in which the second receiving portion 44C not only encloses the temperature sensor 7 but also the measuring section 41, as shown. Figure 3 As shown in the example. Alternatively, it is also possible to consider using the clamp as a fastening element 71, such as... Figure 5 As shown in a schematic and purely exemplary manner. Figure 5 View A in the figure exemplarily shows a resilient clamp having receiving areas 71A, 71B for a measuring section 41 and a temperature sensor 7, respectively, wherein the measuring section 41 and the temperature sensor 7 are snapped into the respective receiving areas 71A, 71B, and these receiving areas are substantially fixed in position relative to each other. Figure 5 View B in the figure exemplarily shows a clamp in which the temperature sensor 7 is received, for example, snapped into a first receiving area 71A, and in which a second receiving area 71B is rotatably connected to the first receiving area 71A via a thin-film hinge, wherein the second receiving area 71B is pivotable such that the measuring section 41 is received, for example, locked in the second receiving area 71B.

[0044] As mentioned above, an additional sensor 8 may optionally be provided, which may take the form of, for example, a second temperature sensor 8 or a pressure sensor. This sensor 8 is arranged such that the saturation temperature or saturation pressure in the evaporator 2 can be detected.

[0045] As described above, the expansion valve 6 is arranged in the input line 5, more specifically, between the input end 21 of the evaporator 2 and the heat exchanger section 45, such as... Figure 2 As shown schematically, expansion valve 6 is configured to expand the refrigerant flowing in the input line before it enters the evaporator. Furthermore, the expansion valve can be configured to change the mass flow or flow rate of the refrigerant. Expansion valve 6 can be, for example, an electronic expansion valve.

[0046] exist Figure 2 The control device 9, shown only schematically as a block, can be, for example, an electronic control device. For instance, the control device 9 may have a processor, such as a CPU, FPGA, ASIC, or the like, and a data memory, particularly a non-volatile data memory, such as flash memory, SD memory, EEPROM memory, or the like. Software that can be implemented by the processor and contains control instructions that cause the processor to generate output signals based on input signals may be stored in the data memory.

[0047] like Figure 2As illustrated, the control device 9 can be connected to the first temperature sensor 7, and if necessary, to the second sensor 8 and the expansion valve 6 via conductive signals, for example, wired or wirelessly. The control device 9 can also be configured to output a control signal to the expansion valve 6, which causes the expansion valve to change the refrigerant flow rate.

[0048] For example, control device 6 can be configured to control expansion valve 6 based on the temperature detected by first temperature sensor 7. Optionally, this may include determining the temperature difference between the temperature detected by temperature sensor 7 and the saturation temperature in evaporator 2. For this purpose, control device 9 can calculate the temperature difference, for example, from the signal from second sensor 8 and the temperature detected by first temperature sensor 7. If second sensor 8 is a pressure sensor, assuming the determined pressure corresponds to the saturation pressure, control device 9 can first determine the saturation temperature based on the measured pressure. Based on the determined temperature difference, control device 9 can output a control signal to expansion valve 6 to cause the expansion valve to increase or decrease the refrigerant flow rate. For example, control device 6 can be configured to cause expansion valve 6 to increase the refrigerant flow rate as the temperature difference increases and decrease the refrigerant flow rate as the temperature difference decreases.

[0049] Therefore, the temperature determined in the measuring section 41 of the suction pipe 4 can, for example, be used to control the expansion valve 6. However, the invention is not limited thereto. Generally, an advantage of the invention is that the temperature of the refrigerant can be determined in the measuring section 41, which follows the refrigerant temperature change at the output end 22 of the evaporator 2 in its temporal trend, but the temperature change is smaller because heat exchange occurs between the refrigerant in the suction pipe 4 and the refrigerant in the input line 5 within the heat exchanger section 45 before the temperature is measured. This facilitates the use of the temperature measured in the measuring section 41 as an adjustment parameter, for example, in combination with other temperature values ​​and with different setting parameters.

[0050] Although the invention has been exemplarily described above with reference to embodiments, the invention is not limited thereto, but can be modified in various ways. In particular, combinations of the above embodiments are also conceivable.

[0051] List of reference numerals 1. Compressor 2 Evaporator 3. Liquefaction unit 4. Suction tube 5 Input lines 6. Expansion valve 7 First Temperature Sensor 8 Second sensor 9. Control device 11. Compressor suction port 12. Pressure interface of the compressor 21. Evaporator input terminal 22 Evaporator output terminal 31. Input terminal of the liquefier 32. Output of the liquefier 41. Measurement section of the suction tube 41A First section of the suction tube 41B The second section of the suction tube 42. The bend in the suction tube 43. The winding section of the suction tube 44 Spacing retainer 44A board 44B First Reception Section 44C Second Reception Section 45 Heat exchanger section / suction tube heat exchanger 71 Fastening components 71A First Accommodation Area 71B Second Accommodation Area 100 Refrigerant Circuit 200 Refrigeration appliances 205 Main Body 206 Enter the opening 210 storage cells 211 inner container 215 doors X-spacing.

Claims

1. A refrigerant circuit (100) for a refrigeration appliance (200), particularly for a household refrigeration appliance, said refrigerant circuit having: Evaporator (2), the evaporator having an inlet (21) for supplying refrigerant and an outlet (22) for discharging the refrigerant; Input line (5), which is connected to the input terminal (21) of the evaporator (2); A suction pipe (4) is connected to the output end (22) of the evaporator (2), and the suction pipe is thermally connected to the input line (5) in the heat exchanger section (45); and Temperature sensor (7) is used to detect the temperature of the refrigerant discharged from the evaporator (2); Its features are, In the heat exchanger section (45), the suction pipe (4) has a measuring section (41), in which the suction pipe (4) extends spaced apart from the input line (5), and The temperature sensor (7) is thermally secured to the measuring section (41).

2. The refrigerant circuit (100) according to claim 1, wherein, The measurement section (41) is separated from the input line (5) by a spacing retainer (44).

3. The refrigerant circuit (100) according to claim 1 or 2, wherein, The measuring section (41) is constructed on the bend (42) of the suction tube (4).

4. The refrigerant circuit (100) according to claim 1 or 2, wherein, The measuring section (41) is constructed on the winding portion (43) of the suction tube (4).

5. The refrigerant circuit (100) according to any one of the preceding claims, wherein, The measurement section (41) extends in a straight line.

6. The refrigerant circuit (100) according to any one of the preceding claims, wherein, The measurement section (41) is arranged with a distance (X) from the input line (5), the distance being in the range of 2mm to 20mm.

7. The refrigerant circuit (100) according to any one of the preceding claims, wherein, Measurements were taken along the suction tube (5), and the measurement section (41) was arranged to have a distance between 50 mm and 500 mm from the output end (21) of the evaporator (2).

8. The refrigerant circuit (100) according to any one of the preceding claims, wherein the refrigerant circuit additionally comprises: An expansion valve (6) is arranged in the input line (5) between the heat exchanger section (45) and the input end (21) of the evaporator (2), and is capable of controlling the expansion valve based on the temperature detected by the temperature sensor (7).

9. The refrigerant circuit (100) according to claim 8, wherein, The expansion valve (6) can be controlled based on the temperature difference between the temperature detected by the temperature sensor (7) and the saturation temperature in the evaporator (2).

10. The refrigerant circuit (100) according to claim 9, wherein, The expansion valve (6) is configured to increase the refrigerant flow rate as the temperature difference increases and decrease the refrigerant flow rate as the temperature difference decreases.

11. The refrigerant circuit (100) according to any one of claims 8 to 10, wherein, The expansion valve (6) is an electronic expansion valve.

12. The refrigerant circuit (100) according to any one of the preceding claims, wherein, The temperature sensor (7) is a PTC sensor, an NTC sensor, or a thermocouple.

13. The refrigerant circuit (100) according to any one of the preceding claims, wherein, The temperature sensor (7) is fastened to the measuring section (41) of the suction tube by means of a fastening element (71), such as a clamp (71), adhesive tape or the like.

14. A refrigeration appliance (200), particularly a household refrigeration appliance, said refrigeration appliance having: Storage compartment (210) for holding refrigerated items; and The refrigerant circuit (100) according to any one of the preceding claims, wherein, The evaporator (2) is thermally coupled to the storage cell (210) so as to absorb heat from the storage cell in the event of refrigerant evaporation.

15. The refrigeration appliance (200) according to claim 14, wherein the refrigeration appliance additionally comprises: The insulating material that insulates the storage compartment (210) from heat. in, At least one area of ​​the measuring section (41) of the heat exchanger section (45), including the suction pipe (4), is surrounded by the insulating material.

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