Equipment for measuring fouling thermal resistance of dairy products

Abstract

The utility model discloses a device for measuring fouling thermal resistance of dairy products, which comprises a communicating pipeline assembly, a heating heat exchange device, a cooling heat exchange device, a custom test section, a flow meter and a thermometer group, and the communicating pipeline assembly is sequentially provided with the flow meter, the heating heat exchange device, the custom test section and the cooling heat exchange device from head to tail; the communicating pipeline assembly is further provided with a thermometer set, and the thermometer set is used for measuring the temperature difference between the user-defined test section inlet and the user-defined test section outlet. Through cooperative arrangement of the thermometer group, the heating heat exchange device, the cooling heat exchange device and the flow meter, the fouling thermal resistance of the plate heat exchanger can be easily measured, and the pipeline fouling thermal resistance of the self-defined test section is indirectly judged.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline dirt detection equipment, in particular to a device for measuring the thermal resistance of dairy dirt. Background Art

[0002] In dairy processing equipment, dirt inside the pipeline is very common. Deposited dirt will cause problems such as reduced cleaning efficiency, pipeline blockage, raw material contamination, and microbial growth. Plate heat exchangers are widely used in industry due to their high heat exchange efficiency and small footprint. Due to the special structure of plate heat exchangers, they are considered to be the most prone to scaling and the most difficult to clean in food pasteurization. Existing devices for detecting dirt inside pipelines have the following problems:

[0003] First, the cost is high. Existing large-scale pipeline internal dirt detection equipment is usually expensive. For some small-scale or budget-limited dairy companies, purchasing and maintaining such equipment may bring great economic pressure;

[0004] Second, the maintenance requirements are high. This type of equipment needs to be regularly maintained, calibrated and maintained to ensure its detection accuracy and stability. This not only increases the company's maintenance costs, but may also cause a short shutdown of the production line, affecting production efficiency.

[0005] In addition, using large-scale dairy pasteurization equipment for research is costly and risky. Summary of the invention

[0006] Therefore, the utility model provides a device for measuring the thermal resistance of dairy dirt to solve the above problems in the prior art.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] According to the first aspect of the utility model, a device for measuring the thermal resistance of dairy dirt includes a connecting pipeline assembly, a heating heat exchange device, a cooling heat exchange device, a custom test section, a flow meter and a thermometer group, wherein the connecting pipeline assembly is provided with a flow meter, a heating heat exchange device, a custom test section and a cooling heat exchange device in sequence from the beginning to the end;

[0009] A thermometer group is also provided on the connecting pipe assembly, and the thermometer group is used to measure the temperature difference between the inlet of the custom test section and the outlet of the custom test section.

[0010] Further, the connecting pipeline assembly includes a first connecting pipeline, a second connecting pipeline, a third connecting pipeline, a first manual valve, a second manual valve, a third manual valve and a fourth manual valve;

[0011] The first end of the second connecting pipeline, the first connecting pipeline and the inlet of the custom test section are connected through a tee, and the second end of the second connecting pipeline, the third connecting pipeline and the outlet of the custom test section are connected through a tee;

[0012] A first manual valve is provided at the first end of the second connecting pipeline, a second manual valve is provided at the second end of the second connecting pipeline, a third manual valve is provided at the inlet of the custom test section, a fourth manual valve is provided at the outlet of the custom test section, a heating heat exchange device is provided on the first connecting pipeline, and a cooling heat exchange device is provided on the second connecting pipeline.

[0013] Further, the connecting pipeline assembly also includes a fourth connecting pipeline, a fifth connecting pipeline, a fifth manual valve, a sixth manual valve, a seventh manual valve and an eighth manual valve;

[0014] Both ends of the fourth connecting pipeline are connected to the first connecting pipeline, and the temperature increasing and heat exchanging device is located between the first end of the fourth connecting pipeline and the second end of the fourth connecting pipeline;

[0015] Both ends of the fifth connecting pipeline are connected to the third connecting pipeline, and the cooling and heat exchanging device is located between the first end of the fifth connecting pipeline and the second end of the fifth connecting pipeline;

[0016] A fifth manual valve is disposed at the first end of the fourth communicating pipeline, and a sixth manual valve is disposed at the second end of the fourth communicating pipeline;

[0017] A seventh manual valve is disposed at the first end of the fifth communicating line, and an eighth manual valve is disposed at the second end of the fifth communicating line.

[0018] Furthermore, the connecting pipe assembly also includes a sixth connecting pipe, the heating and heat exchanging device includes a heating plate heat exchanger and a heating water tank, the side of the heating plate heat exchanger is provided with a first inlet, a first outlet, a second inlet and a second outlet, the first inlet and the second outlet are both provided on the first connecting pipe, the first end of the sixth connecting pipe is connected to the first outlet, the second end of the sixth connecting pipe is connected to the second inlet, and the sixth connecting pipe is provided with a heating water tank.

[0019] Furthermore, the connecting pipe assembly also includes a seventh connecting pipe, the cooling and heat exchanging device includes a cooling plate heat exchanger and a common water tank, the side of the cooling plate heat exchanger is provided with a third inlet, a third outlet, a fourth inlet and a fourth outlet, the third inlet and the fourth outlet are both provided on the third connecting pipe, the first end of the seventh connecting pipe is connected to the third outlet, the second end of the seventh connecting pipe is connected to the fourth inlet, and the seventh connecting pipe is provided with a common water tank.

[0020] Furthermore, the temperature increasing and heat exchanging device also includes a first variable frequency centrifugal pump, which is connected to the sixth connecting pipeline and is located between the heating water tank and the first outlet.

[0021] Furthermore, the cooling and heat exchanging device also includes a second variable frequency centrifugal pump, which is connected to the seventh connecting pipeline and is located between the common water tank and the fourth inlet.

[0022] Further, the thermometer group includes a first thermometer, a second thermometer, a third thermometer and a fourth thermometer;

[0023] The first thermometer, the second thermometer, the third thermometer and the fourth thermometer are all arranged on the connecting pipe assembly, the first thermometer is located between the heating heat exchange device and the flow meter, the second thermometer is located between the heating heat exchange device and the custom test section, the third thermometer is located between the custom test section and the cooling heat exchange device, and the cooling heat exchange device is located between the third thermometer and the fourth thermometer.

[0024] Furthermore, the thermometer group also includes a fifth thermometer and a sixth thermometer, both of which are arranged on the sixth connecting pipeline, the fifth thermometer is located between the first variable frequency centrifugal pump and the first outlet, and the sixth thermometer is located between the second inlet and the heating water tank.

[0025] Furthermore, the thermometer group also includes a seventh thermometer and an eighth thermometer, both of which are arranged on the seventh connecting pipeline, the seventh thermometer is located between the third outlet and the ordinary water tank, and the eighth thermometer is located between the fourth inlet and the second variable frequency centrifugal pump.

[0026] The utility model has the following advantages: through the coordinated setting of the thermometer group, the heating heat exchange device, the cooling heat exchange device and the flow meter, it is easy to measure the dirt of the pipeline of the custom test section, and the thermometer group is used to measure the hot fluid inlet temperature of the heating heat exchange device, the hot fluid outlet temperature of the heating heat exchange device, the cold fluid inlet temperature of the cooling heat exchange device and the cold fluid outlet temperature of the cooling heat exchange device, as well as the specific heat capacity of the cold fluid, the density of the cold fluid, the volume flow rate of the cold fluid, the heating heat exchange device and the effective heat exchange area of ​​the cooling heat exchange device. Through these easily obtained data, the plate heat exchanger fouling thermal resistance can be conveniently measured, which indirectly reflects the dirt of the custom test section and judges the dirt; in addition, the device reserves a custom test section, and the test pipeline size standard can be designed according to the situation; finally, the setting of two heat exchange devices, one for heating and the other for cooling, makes the heating and cooling of the milk source closer to the actual factory. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0028] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0029] Figure 1 A schematic structural diagram of a device for measuring the thermal resistance of dairy dirt provided in some embodiments of the utility model.

[0030] In the figure: 1, first connecting pipeline, 2, fourth connecting pipeline, 3, second connecting pipeline, 4, heating plate heat exchanger, 41, first inlet, 42, first outlet, 43, second inlet, 44, second outlet, 5, fifth connecting pipeline, 6, first thermometer, 61, second thermometer, 62, fifth thermometer, 63, sixth thermometer, 64, third thermometer, 65, seventh thermometer, 66, eighth thermometer, 67, fourth thermometer, 7, flow meter, 8, cooling plate heat exchanger, 81, third inlet, 82, third outlet, 83, fourth inlet, 84, fourth outlet, 9, custom test section, 10, the Six connecting pipelines, 11, seventh connecting pipeline, 12, first variable frequency centrifugal pump, 13, heating water tank, 14, ordinary water tank, 15, fifth manual valve, 16, sixth manual valve, 17, ninth manual valve, 18, tenth manual valve, 19, first manual valve, 20, third manual valve, 21, fourth manual valve, 22, second manual valve, 23, seventh manual valve, 24, eleventh manual valve, 25, fifteenth manual valve, 26, sixteenth manual valve, 27, twelfth manual valve, 28, eighth manual valve, 29, thirteenth manual valve, 30, fourteenth manual valve, 31, second variable frequency centrifugal pump, 32, third connecting pipeline. DETAILED DESCRIPTION

[0031] The following is a specific embodiment of the present invention. People familiar with the technology can easily understand the other advantages and functions of the present invention from the contents disclosed in this specification. Obviously, the described embodiment is a part of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] like Figure 1 As shown, a device for measuring the thermal resistance of dairy dirt in the embodiment of the first aspect of the utility model comprises a connecting pipe assembly, a heating and heat exchanging device, a cooling and heat exchanging device, a custom test section 9, a flow meter 7 and a thermometer group, and the connecting pipe assembly is provided with a flow meter 7, a heating and heat exchanging device, a custom test section 9 and a cooling and heat exchanging device in sequence from the beginning to the end;

[0033] A thermometer group is also provided on the connecting pipe assembly, and the thermometer group is used to measure the temperature difference between the inlet of the custom test section 9 and the outlet of the custom test section 9.

[0034] In the above embodiment, it should be noted that the working principle of the device is that the fouling thermal resistance can be calculated by the following formula:

[0035]

[0036] Among them, T h,i , T h,o , T c,i , T c,o They represent the hot fluid inlet temperature of the heating heat exchanger, the hot fluid outlet temperature of the heating heat exchanger, the cold fluid inlet temperature of the cooling heat exchanger, and the cold fluid outlet temperature of the cooling heat exchanger. These temperatures can be obtained by the thermometer group. c is the heat transfer load of the cold fluid, C p,c is the specific heat capacity of the cold fluid at constant pressure, ρ c is the cold fluid density, V c is the volume flow rate of the cold fluid, which can be obtained by flow meter 7, A o is the effective heat transfer area of ​​the plate heat exchanger. U and U o is the total heat transfer coefficient and initial total heat transfer coefficient of the plate heat exchanger. f Stands for fouling thermal resistance.

[0037] The technical effect achieved by the above embodiment is: through the coordinated setting of the thermometer group, the heating heat exchange device, the cooling heat exchange device and the flow meter, the plate heat exchanger 4 and the plate heat exchanger 8 can be measured for fouling, and the thermometer group is used to measure the hot fluid inlet temperature of the heating heat exchange device, the hot fluid outlet temperature of the heating heat exchange device, the cold fluid inlet temperature of the cooling heat exchange device and the cold fluid outlet temperature of the cooling heat exchange device, as well as the specific heat capacity of the cold fluid, the density of the cold fluid, the volume flow rate of the cold fluid, the effective heat exchange area of ​​the heating heat exchange device and the cooling heat exchange device. Through these easily accessible data, the fouling thermal resistance can be conveniently measured and the fouling can be judged; through the thermometers on both sides of the custom test section, the fouling situation of the custom test section can be indirectly reflected. In addition, the device reserves a custom test section, and the test pipeline size standard can be designed according to the situation; finally, the setting of two heat exchange devices, one for heating and the other for cooling, makes the heating and cooling of the milk source more in line with the actual factory.

[0038] Optional, such as Figure 1 As shown, in some embodiments, the connecting pipeline assembly includes a first connecting pipeline 1, a second connecting pipeline 3, a third connecting pipeline 32, a first manual valve 19, a second manual valve 22, a third manual valve 20 and a fourth manual valve 21;

[0039] The first end of the second connecting pipeline 3, the first connecting pipeline 1 and the inlet of the custom test section 9 are connected through a tee, and the second end of the second connecting pipeline 3, the third connecting pipeline 32 and the outlet of the custom test section 9 are connected through a tee;

[0040] A first manual valve 19 is provided at the first end of the second connecting pipeline 3, a second manual valve 22 is provided at the second end of the second connecting pipeline 3, a third manual valve 20 is provided at the inlet of the custom test section 9, a fourth manual valve 21 is provided at the outlet of the custom test section 9, a heating and heat exchanging device is provided on the first connecting pipeline 1, and a cooling and heat exchanging device is provided on the second connecting pipeline 3;

[0041] The connecting pipeline assembly further includes a fourth connecting pipeline 2, a fifth connecting pipeline 5, a fifth manual valve 15, a sixth manual valve 16, a seventh manual valve 23 and an eighth manual valve 28;

[0042] Both ends of the fourth connecting pipeline 2 are connected to the first connecting pipeline 1, and the temperature increasing heat exchanging device is located between the first end of the fourth connecting pipeline 2 and the second end of the fourth connecting pipeline 2;

[0043] Both ends of the fifth connecting pipe 5 are connected to the third connecting pipe 32, and the cooling and heat exchanging device is located between the first end of the fifth connecting pipe 5 and the second end of the fifth connecting pipe 5;

[0044] A fifth manual valve 15 is disposed at the first end of the fourth communication pipeline 2, and a sixth manual valve 16 is disposed at the second end of the fourth communication pipeline 2;

[0045] A seventh manual valve 23 is disposed at a first end of the fifth communication line 5 , and an eighth manual valve 28 is disposed at a second end of the fifth communication line 5 .

[0046] The thermometer group includes a first thermometer 6, a second thermometer 61, a third thermometer 64 and a fourth thermometer 67;

[0047] The first thermometer 6, the second thermometer 61, the third thermometer 64 and the fourth thermometer 67 are all arranged on the connecting pipe assembly. The first thermometer 6 is located between the heating heat exchange device and the flow meter 7, the second thermometer 61 is located between the heating heat exchange device and the custom test section 9, the third thermometer 64 is located between the custom test section 9 and the cooling heat exchange device, and the cooling heat exchange device is located between the third thermometer 64 and the fourth thermometer 67.

[0048] In the above optional embodiments, it should be noted that the first thermometer 6 , the second thermometer 61 , the third thermometer 64 and the fourth thermometer 67 are all arranged on the connecting pipe assembly by means of threaded connection or clamping.

[0049] The beneficial effects of the above optional embodiments are: the setting of the first thermometer 6 can effectively measure the inlet temperature of the hot fluid of the heating heat exchange device, the setting of the second thermometer 61 can effectively measure the outlet temperature of the hot fluid of the heating heat exchange device; the setting of the third thermometer 64 can effectively measure the inlet temperature of the cold fluid of the cooling heat exchange device; the setting of the fourth thermometer 67 can effectively measure the outlet temperature of the cold fluid of the cooling heat exchange device.

[0050] Optional, such as Figure 1 As shown, in some embodiments, the connecting pipe assembly also includes a sixth connecting pipe 10, the temperature-raising heat exchange device includes a temperature-raising plate heat exchanger 4 and a heating water tank 13, and the side of the temperature-raising plate heat exchanger 4 is provided with a first inlet 41, a first outlet 42, a second inlet 43 and a second outlet 44, the first inlet 41 and the second outlet 44 are both provided on the first connecting pipe 1, the first end of the sixth connecting pipe 10 is connected to the first outlet 42, the second end of the sixth connecting pipe 10 is connected to the second inlet 43, and the sixth connecting pipe 10 is provided with a heating water tank 13.

[0051] The temperature-raising heat exchange device further includes a first variable frequency centrifugal pump 12, which is connected to the sixth connecting pipe 10, and is located between the heating water tank 13 and the first outlet 42;

[0052] The connecting pipe assembly also includes a seventh connecting pipe 11. The cooling and heat exchanging device includes a cooling plate heat exchanger 8 and a common water tank 14. A third inlet 81, a third outlet 82, a fourth inlet 83 and a fourth outlet 84 are provided on the side of the cooling plate heat exchanger 8. The third inlet 81 and the fourth outlet 84 are both provided on the third connecting pipe 32. The first end of the seventh connecting pipe 11 is connected to the third outlet 82, the second end of the seventh connecting pipe 11 is connected to the fourth inlet 83, and the seventh connecting pipe 11 is provided with a common water tank 14.

[0053] The cooling and heat exchanging device further includes a second variable frequency centrifugal pump 31 , which is connected to the seventh connecting pipe 11 and is located between the common water tank 14 and the fourth inlet 83 .

[0054] The thermometer group also includes a fifth thermometer 62 and a sixth thermometer 63. The fifth thermometer 62 and the sixth thermometer 63 are both arranged on the sixth connecting pipe 10. The fifth thermometer 62 is located between the first variable frequency centrifugal pump 12 and the first outlet 42, and the sixth thermometer 63 is located between the second inlet 43 and the heating water tank 13.

[0055] The thermometer group also includes a seventh thermometer 65 and an eighth thermometer 66. The seventh thermometer 65 and the eighth thermometer 66 are both arranged on the seventh connecting pipe 11. The seventh thermometer 65 is located between the third outlet 82 and the ordinary water tank 14, and the eighth thermometer 66 is located between the fourth inlet 83 and the second variable frequency centrifugal pump 31.

[0056] In the above optional embodiment, it should be noted that it further includes a ninth manual valve 17, a tenth manual valve 18, an eleventh manual valve 24, a twelfth manual valve 27, a thirteenth manual valve 29, a fourteenth manual valve 30, a fifteenth manual valve 25 and a sixteenth manual valve 26;

[0057] The ninth manual valve 17 is located between the first inlet 41 and the first end of the fourth connecting pipe 2, the tenth manual valve 18 is located between the second outlet 42 and the second end of the fourth connecting pipe 2, the eleventh manual valve 24 is located between the first end of the fifth connecting pipe 5 and the third inlet 81, the twelfth manual valve 27 is located between the fourth inlet 84 and the second end of the fifth connecting pipe 5, the thirteenth manual valve 29 is located between the sixth thermometer 63 and the heating water tank 13, the fourteenth manual valve 30 is located between the first variable frequency centrifugal pump 12 and the fifth thermometer 62, the fifteenth manual valve 25 is located between the ordinary water tank 14 and the seventh thermometer 65, and the sixteenth manual valve 26 is located between the second variable frequency centrifugal pump 31 and the eighth thermometer 66.

[0058] The beneficial effects of the above optional embodiments are as follows: the flow rate of the heating plate heat exchanger 4 can be controlled by setting the first variable frequency centrifugal pump 12; the flow rate of the cooling plate heat exchanger 8 can be controlled by setting the second variable frequency centrifugal pump 31; the fifth thermometer 62 and the sixth thermometer 63 can measure the inlet and outlet temperatures of the heating water tank 13, thereby controlling the heating temperature; the seventh thermometer 65 and the eighth thermometer 66 can measure the inlet and outlet temperatures of the ordinary water tank 14, thereby controlling the cooling temperature.

[0059] The working principle of this device is:

[0060] When the equipment is running, the ninth manual valve 17, the tenth manual valve 18, the first manual valve 19, the second manual valve 22, the eleventh manual valve 24, the twelfth manual valve 27, the fifteenth manual valve 25, the sixteenth manual valve 26, the thirteenth manual valve 29 and the fourteenth manual valve 30 are opened, and the fifth manual valves 15, 16, the sixth manual valve 16, the third manual valves 20, 21, the fourth manual valve 21, the seventh manual valve 23 and the eighth manual valve 28 are closed. At this time, the liquid in the main pipeline passes through the flow meter 7, the first thermometer 6, the heating plate heat exchanger 4, the fifth thermometer 62, the sixth thermometer 63, the second thermometer 61, the second connecting pipeline 3, the third thermometer 64, the cooling plate heat exchanger 8, the seventh thermometer 65, the eighth thermometer 66 and the fourth thermometer 67 in sequence. The heating plate heat exchanger 4 is used to heat the liquid in the main pipeline, and the cooling plate heat exchanger 8 is used to cool the liquid in the main pipeline. The liquid in the main pipeline circulates, and so on. The variable frequency centrifugal pump 12 transports the heated hot water in the heating water tank 13 (or the ice water in the common water tank 14) to the heating plate heat exchanger 4 and the cooling plate heat exchanger 8 for heat exchange and circulation.

[0061] When it is necessary to measure the dirt of the custom test section 9, open the ninth manual valve 17, the tenth manual valve 18, the third manual valve 20, the fourth manual valve 21, the eleventh manual valve 24, the twelfth manual valve 27, the fifteenth manual valve 25, the sixteenth manual valve 26, the thirteenth manual valve 29 and the fourteenth manual valve 30, and close the manual valve 15, the sixth manual valve 16, the first manual valve 19, the second manual valve 22, the seventh manual valve 23, and the eighth manual valve 28. At this time, the liquid in the main line passes through the flow meter 7, the first thermometer 6, the heating plate heat exchanger 4, the fifth thermometer 62, the sixth thermometer 63, the second thermometer 61, the custom test section 9, the third thermometer 64, the cooling plate heat exchanger 8, the seventh thermometer 65, the eighth thermometer 66 and the fourth thermometer 67 in sequence. By observing the temperature difference measured at the inlet and outlet of the custom test section, the dirt condition of the custom test section can be obtained.

[0062] In addition, if only heat exchange work is performed, open the ninth manual valve 17, the tenth manual valve 18, the eighth manual valve 28, the seventh manual valve 23, the thirteenth manual valve 29 and the fourteenth manual valve 30, and close the fifth manual valve 15, the sixth manual valve 16, the eleventh manual valve 24, the fifteenth manual valve 25, the sixteenth manual valve 26 and the twelfth manual valve 27.

[0063] If only the cooling operation is performed, open the fifth manual valve 15, the sixth manual valve 16, the eleventh manual valve 24, the fifteenth manual valve 25, the sixteenth manual valve 26 and the twelfth manual valve 27, and close the ninth manual valve 17, the tenth manual valve 18, the eighth manual valve 28, the seventh manual valve 23, the thirteenth manual valve 29 and the fourteenth manual valve 30.

[0064] Although the utility model has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the utility model. Therefore, these modifications or improvements made without departing from the spirit of the utility model are within the scope of protection claimed by the utility model.

[0065] The terms such as "upper", "lower", "left", "right", "middle", etc. cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should be regarded as the scope of implementation of the present invention without substantially changing the technical content.

Claims

1. A device for measuring the thermal resistance of dairy dirt, characterized in that: The apparatus comprises a connecting pipe assembly, a heating and heat exchanging device, a cooling and heat exchanging device, a custom test section (9), a flow meter (7) and a thermometer group, wherein the connecting pipe assembly is provided with the flow meter (7), the heating and heat exchanging device, the custom test section (9) and the cooling and heat exchanging device in sequence from the beginning to the end; The connecting pipe assembly is also provided with the thermometer group, which is used to measure the temperature difference between the inlet of the custom test section (9) and the outlet of the custom test section (9).

2. The device for measuring the thermal resistance of dairy dirt according to claim 1, characterized in that: The connecting pipeline assembly comprises a first connecting pipeline (1), a second connecting pipeline (3), a third connecting pipeline (32), a first manual valve (19), a second manual valve (22), a third manual valve (20) and a fourth manual valve (21); The first end of the second connecting pipeline (3), the first connecting pipeline (1) and the inlet of the custom test section (9) are connected via a tee, and the second end of the second connecting pipeline (3), the third connecting pipeline (32) and the outlet of the custom test section (9) are connected via a tee; The first end of the second connecting pipeline (3) is provided with the first manual valve (19), the second end of the second connecting pipeline (3) is provided with the second manual valve (22), the inlet of the custom test section (9) is provided with the third manual valve (20), the outlet of the custom test section (9) is provided with the fourth manual valve (21), the temperature increasing heat exchange device is provided on the first connecting pipeline (1), and the temperature decreasing heat exchange device is provided on the second connecting pipeline (3).

3. The device for measuring thermal resistance of dairy dirt according to claim 2, characterized in that: The connecting pipeline assembly further comprises a fourth connecting pipeline (2), a fifth connecting pipeline (5), a fifth manual valve (15), a sixth manual valve (16), a seventh manual valve (23) and an eighth manual valve (28); Both ends of the fourth connecting pipeline (2) are connected to the first connecting pipeline (1), and the temperature increasing heat exchanging device is located between the first end of the fourth connecting pipeline (2) and the second end of the fourth connecting pipeline (2); Both ends of the fifth connecting pipeline (5) are connected to the third connecting pipeline (32), and the cooling and heat exchanging device is located between the first end of the fifth connecting pipeline (5) and the second end of the fifth connecting pipeline (5); The first end of the fourth connecting pipeline (2) is provided with the fifth manual valve (15), and the second end of the fourth connecting pipeline (2) is provided with the sixth manual valve (16); The first end of the fifth connecting line (5) is provided with the seventh manual valve (23), and the second end of the fifth connecting line (5) is provided with the eighth manual valve (28).

4. The device for measuring the thermal resistance of dairy dirt according to claim 2, characterized in that: The connecting pipe assembly further comprises a sixth connecting pipe (10); the temperature-raising heat exchange device comprises a temperature-raising plate heat exchanger (4) and a heating water tank (13); a first inlet (41), a first outlet (42), a second inlet (43) and a second outlet (44) are arranged on the side of the temperature-raising plate heat exchanger (4); the first inlet (41) and the second outlet (44) are both arranged on the first connecting pipe (1); a first end of the sixth connecting pipe (10) is connected to the first outlet (42); a second end of the sixth connecting pipe (10) is connected to the second inlet (43); and the heating water tank (13) is arranged on the sixth connecting pipe (10).

5. The device for measuring thermal resistance of dairy dirt according to claim 2, characterized in that: The connecting pipeline assembly further comprises a seventh connecting pipeline (11); the cooling and heat exchanging device comprises a cooling plate heat exchanger (8) and a common water tank (14); a third inlet (81), a third outlet (82), a fourth inlet (83) and a fourth outlet (84) are arranged on the side of the cooling plate heat exchanger (8); the third inlet (81) and the fourth outlet (84) are both arranged on the third connecting pipeline (32); a first end of the seventh connecting pipeline (11) is connected to the third outlet (82); a second end of the seventh connecting pipeline (11) is connected to the fourth inlet (83); and the common water tank (14) is arranged on the seventh connecting pipeline (11).

6. The device for measuring thermal resistance of dairy dirt according to claim 4, characterized in that: The temperature-raising heat exchange device further comprises a first variable-frequency centrifugal pump (12), the first variable-frequency centrifugal pump (12) being connected to the sixth connecting pipeline (10), and the first variable-frequency centrifugal pump (12) being located between the heating water tank (13) and the first outlet (42).

7. The device for measuring thermal resistance of dairy dirt according to claim 5, characterized in that: The cooling and heat exchanging device further comprises a second variable frequency centrifugal pump (31), the second variable frequency centrifugal pump (31) being connected to the seventh connecting pipe (11), and the second variable frequency centrifugal pump (31) being located between the common water tank (14) and the fourth inlet (83).

8. The device for measuring thermal resistance of dairy dirt according to claim 1, characterized in that: The thermometer group comprises a first thermometer (6), a second thermometer (61), a third thermometer (64) and a fourth thermometer (67); The first thermometer (6), the second thermometer (61), the third thermometer (64) and the fourth thermometer (67) are all arranged on the connecting pipe assembly, the first thermometer (6) is located between the temperature increasing heat exchange device and the flow meter (7), the second thermometer (61) is located between the temperature increasing heat exchange device and the custom test section (9), the third thermometer (64) is located between the custom test section (9) and the temperature decreasing heat exchange device, and the temperature decreasing heat exchange device is located between the third thermometer (64) and the fourth thermometer (67).

9. The device for measuring thermal resistance of dairy dirt according to claim 6, characterized in that: The thermometer group further includes a fifth thermometer (62) and a sixth thermometer (63). The fifth thermometer (62) and the sixth thermometer (63) are both arranged on the sixth connecting pipe (10). The fifth thermometer (62) is located between the first variable frequency centrifugal pump (12) and the first outlet (42), and the sixth thermometer (63) is located between the second inlet (43) and the heating water tank (13).

10. The device for measuring thermal resistance of dairy dirt according to claim 7, characterized in that: The thermometer group further comprises a seventh thermometer (65) and an eighth thermometer (66), wherein the seventh thermometer (65) and the eighth thermometer (66) are both arranged on the seventh connecting pipe (11), the seventh thermometer (65) is located between the third outlet (82) and the common water tank (14), and the eighth thermometer (66) is located between the fourth inlet (83) and the second variable frequency centrifugal pump (31).

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