Defrosting structure, air conditioning system and control method

Abstract

The invention provides a defrosting structure, an air conditioning system and a control method, and the defrosting structure comprises a weighing module which is used for detecting the weight of an evaporator; the first temperature detection module is used for detecting the temperature of an icing part of the defrosting structure; the second temperature detection module is used for detecting the temperature of a refrigerant in a refrigerant outlet pipe of the defrosting structure; the defrosting module is used for defrosting the frozen part of the defrosting structure; and the control module controls the defrosting module according to the weight of the evaporator, the temperature value detected by the first temperature detection module and the temperature value detected by the second temperature detection module, and the defrosting structure solves the technical problem of equipment failure caused by frosting of the air conditioning unit.

Description

Technical Field

[0001] The present invention relates to the technical field of defrosting, and in particular to a defrosting structure, an air conditioning system and a control method. Background Art

[0002] In the field of refrigeration and freezing, the working conditions of the units are much worse than those of general air conditioners. Long-term operation of the air cooler under such conditions will inevitably lead to frost. Since most users are non-professionals, they often cause icing of the units due to improper use of the units, and even form a vicious cycle. Eventually, the ice layer becomes thicker and thicker, causing the units to fail irreparably.

[0003] Therefore, the prior art needs to be further developed. Summary of the invention

[0004] The purpose of the present invention is to overcome the above technical deficiencies and provide a defrosting structure and a control method to solve the technical problem of equipment failure caused by frosting of air-conditioning units in the related art.

[0005] In order to achieve the above-mentioned technical objectives, the present invention adopts the following technical solutions: a defrost structure is provided, including: a weighing module for detecting the weight of an evaporator; a first temperature detection module for detecting the temperature of an iced portion of the defrost structure; a second temperature detection module for detecting the temperature of the refrigerant in the refrigerant outlet pipe of the defrost structure; a defrost module for defrosting the iced portion of the defrost structure; and a control module, wherein the control module controls the defrost module according to the weight of the evaporator, the temperature value detected by the first temperature detection module, and the temperature value detected by the second temperature detection module.

[0006] Further, the first temperature detection module includes a first temperature sensor arranged at the cold end fin of the defrost structure; and / or the first temperature detection module includes a second temperature sensor arranged on the refrigerant outlet pipe.

[0007] Further, the first temperature detection module includes a first temperature sensor for detecting the temperature value of the ice point of the defrost structure, and there are multiple first temperature sensors, which are arranged at intervals; and / or, the second temperature detection module includes a second temperature sensor for detecting the refrigerant temperature value in the refrigerant outlet pipe of the defrost structure, and there are multiple second temperature sensors, which are arranged at intervals.

[0008] An air conditioning system includes the above-mentioned defrost structure, and the air conditioning system includes: an indoor unit arranged in a cold storage; the evaporator is arranged in the indoor unit; an outdoor unit is arranged outside the cold storage; one end of the refrigerant outlet pipe of the defrost structure is connected to the indoor unit, and the other end of the refrigerant outlet pipe is connected to the outdoor unit.

[0009] A control method is applicable to the above-mentioned defrost structure, and the control method includes: a weighing module 1 detects the weight of an evaporator; a first temperature detection module detects the temperature value of an iced portion of the defrost structure; a second temperature detection module detects the temperature value of a refrigerant in a refrigerant outlet pipe 2 of the defrost structure; a defrost module defrosts the iced portion of the defrost structure; after defrosting for a period of time, a control module controls the defrost module according to the weight of the evaporator, the temperature value detected by the first temperature detection module, and the temperature value detected by the second temperature detection module.

[0010] Furthermore, the control method comprises: judging whether the defrosting of the defrosting structure is sufficient; if the defrosting is insufficient, controlling the defrosting structure to perform defrosting; if the defrosting is sufficient, controlling the defrosting structure to stop defrosting.

[0011] Furthermore, the control method includes: calculating the defrost time S of the defrost structure, detecting the defrost exit time S2 of the defrost structure; if the defrost time S≥S2, controlling the defrost module according to the temperature detected by the second temperature module.

[0012] Furthermore, the control method includes detecting the weight G of the evaporator before defrosting; detecting the weight G1 of the evaporator when the defrost structure is powered on for the first time or refrigerated for the first time after defrosting; detecting the temperature T1 of frozen frost or ice; controlling the defrost module according to the formula W*X = (G-G1)*(0-T1)*2100+4200*(G-G1); wherein X is the heat transfer coefficient; and the units of G and G1 are kg.

[0013] Further, according to the formula S2=W1 / W / 60+S1, the defrost exit time S2 of the defrost structure is calculated; wherein S1 is the defrost time margin; W1 is the electric heating power of the defrost module; and W is the defrost power.

[0014] Further, when the temperature value T2 detected by the second temperature module is ≤0, G<G1+0.1, the defrost module is controlled not to exit defrosting, and the value of S1 is increased; and it is continued to detect whether S≥S2.

[0015] Furthermore, if T2≤0, G≥G1+0.1; the value of X is reduced, the defrost module does not exit defrosting; and continues to detect whether S≥S2.

[0016] Further, if 0<T2≤T3, G<G1+0.1, the defrost module exits defrosting; wherein, T3 is a set value, and T3 is greater than 0.

[0017] Further, if T3<T2≤T4, G≥G1+0.1; after a preset delay time, the defrost module exits defrosting; wherein, T4 is greater than T3.

[0018] Furthermore, if T3<T2≤T4, G<G1+0.1; the defrost module exits defrosting and the value of S1 is reduced.

[0019] Further, if T2>T4, G≥G1+0.1, the defrost module exits defrosting; adjusts the weighing module of the defrost structure; and / or, if T2>T4, G<G1+0.1; the defrost module exits defrosting; increases the value of X.

[0020] Beneficial effects: The defrost structure includes a weighing module for detecting the weight of the evaporator; a first temperature detection module for detecting the temperature of the iced part of the defrost structure; a second temperature detection module for detecting the refrigerant temperature in the refrigerant outlet pipe of the defrost structure; a defrost module for defrosting the iced part of the defrost structure; and a control module, which controls the defrost module according to the weight of the evaporator, the temperature value detected by the first temperature detection module, and the temperature value detected by the second temperature detection module. With the above arrangement, in the process of detecting refrigeration, by detecting the weight of the evaporator and the temperature, the heat energy required for melting the ice and frost on the evaporator into water is calculated, and the electric heating time is optimized, thereby solving the technical problem of equipment failure caused by frost in the air-conditioning unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a structural schematic diagram of a defrosting structure adopted in an embodiment of the present invention; Figure 2 It is a flow chart of a control method provided by an embodiment of the present invention.

[0022] The above drawings include the following reference numerals: 1. Weighing module; 2. Refrigerant outlet pipe; 3. First temperature sensor; 4. Second temperature sensor; 10. Cold storage; 20. Indoor unit; 30. Outdoor unit. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0024] According to an embodiment of the present invention, a defrost structure is provided, comprising: a weighing module 1 for detecting the weight of an evaporator; a first temperature detection module for detecting the temperature of an iced portion of the defrost structure; a second temperature detection module for detecting the temperature of the refrigerant in a refrigerant outlet pipe 2 of the defrost structure; a defrost module for defrosting the iced portion of the defrost structure; and a control module, wherein the control module controls the defrost module according to the weight of the evaporator, the temperature value detected by the first temperature detection module, and the temperature value detected by the second temperature detection module. With the above arrangement, in the process of detecting refrigeration, by detecting the weight of the evaporator and the temperature, the heat energy required for melting ice and frost on the evaporator into water is calculated, and the electric heating time is optimized, thereby solving the technical problem of equipment failure caused by frost in the air-conditioning unit.

[0025] In the defrosting structure of this embodiment, see Figure 1 , Figure 2 , the first temperature detection module includes a first temperature sensor 3 arranged at the cold end fin of the defrost structure; and / or, the first temperature detection module includes a second temperature sensor 4 arranged on the refrigerant outlet pipe 2. In this way, by arranging temperature sensors at appropriate positions and measuring representative temperature values, the refrigeration condition of the defrost module is reflected, thereby effectively controlling the defrost module.

[0026] Specifically, a first temperature sensor 3 is fixed at the cold end fin of the unit (keeping a distance of 10 mm from the fin) to detect the frost or ice temperature, and a second temperature sensor 4 is arranged on the refrigerant outlet pipe 2 inside the unit to detect the refrigerant temperature.

[0027] See also Figure 1 , Figure 2 In the defrost structure of this embodiment, the first temperature detection module includes a first temperature sensor 3 for detecting the temperature value of the iced part of the defrost structure, and the first temperature sensor 3 is multiple, and the multiple first temperature sensors 3 are arranged at intervals; and / or, the second temperature detection module includes a second temperature sensor 4 for detecting the refrigerant temperature value in the refrigerant outlet pipe 2 of the defrost structure, and the second temperature sensor 4 is multiple, and the multiple second temperature sensors 4 are arranged at intervals. In this way, by placing temperature sensors at different positions and measuring the temperature values ​​of different parts, the measurement of the temperature value is made more precise, thereby accurately reflecting the working condition of the defrost module.

[0028] See also Figure 1The air conditioning system of this embodiment includes the above-mentioned defrosting structure, and the air conditioning system includes: an indoor unit 20 arranged in a cold storage 10; the evaporator is arranged in the indoor unit 20; an outdoor unit 30 arranged outside the cold storage 10; one end of the refrigerant outlet pipe 2 of the defrosting structure is connected to the indoor unit 20, and the other end of the refrigerant outlet pipe 2 is connected to the outdoor unit 30. At present, the commonly used technology in the defrosting technology of small cold storage is electric defrosting, but in order to ensure clean defrosting during electric heating operation, the defrosting time is longer than the actual defrosting time, resulting in a large amount of invalid energy waste and even affecting the storage temperature. Through the above-mentioned settings, detection is carried out, the heat required for defrosting is calculated, and the defrosting exit time is determined, which solves the technical problem of equipment failure caused by frosting of the air conditioning unit.

[0029] The control method of this embodiment, see Figure 2 , applicable to the above-mentioned defrosting structure, the control method includes: a weighing module 1 detects the weight of the evaporator; a first temperature detection module detects the temperature value of the iced part of the defrosting structure; a second temperature detection module detects the refrigerant temperature value in the refrigerant outlet pipe 2 of the defrosting structure; the defrosting module defrosts the iced part of the defrosting structure; after defrosting for a period of time, the control module controls the defrosting module according to the weight of the evaporator, the temperature value detected by the first temperature detection module, and the temperature value detected by the second temperature detection module. In this way, in the process of detecting refrigeration, by detecting the weight of the evaporator, detecting the temperature, calculating the heat energy required for the ice and frost on the evaporator to melt into water, optimizing the electric heating time, and solving the technical problem of equipment failure caused by frost in the air-conditioning unit.

[0030] In the control method of this embodiment, see Figure 2 The control method includes: judging whether the defrosting structure is sufficient; if the defrosting is not sufficient, controlling the defrosting structure to defrost; if the defrosting is sufficient, controlling the defrosting structure to stop defrosting. In this way, in the process of detecting refrigeration, by detecting the weight of the evaporator, detecting the temperature, and calculating the heat energy required for the ice and frost on the evaporator to turn into water, it is judged whether the defrosting is sufficient, making the control of the defrost module simpler.

[0031] In the control method of this embodiment, see Figure 2 The control method includes: calculating the defrost time S of the defrost structure, detecting the defrost exit time S2 of the defrost structure; if the defrost time S≥S2, controlling the defrost module according to the temperature detected by the second temperature module.

[0032] In the control method of this embodiment, see Figure 2The control method includes: detecting the weight G of the evaporator before defrosting; detecting the weight G1 of the evaporator when the defrosting structure is powered on for the first time or refrigerated for the first time after defrosting; detecting the temperature T1 of frozen frost or ice; controlling the defrost module according to the formula W*X = (G-G1)*(0-T1)*2100+4200*(G-G1); wherein X is the heat transfer coefficient; the unit of G and G1 is kg. Specifically, the power required for defrosting module frost is calculated by the specific heat capacity of ice and water in different states, so that the control of the defrost module is more accurate.

[0033] See also Figure 2 In the control method of this embodiment, according to the formula S2=W1 / W / 60+S1, the defrosting exit time S2 of the defrosting structure is calculated; wherein S1 is the defrosting time margin; W1 is the electric heating power of the defrosting module; and W is the defrosting power. With the above settings, the time required for defrosting is calculated, that is, how much time is needed to defrost completely, so that the control of the defrosting module is more accurate.

[0034] See also Figure 2 In the control method of this embodiment, when the temperature value T2 detected by the second temperature module is less than or equal to 0, and G is less than or equal to G1+0.1, the defrost module is controlled not to exit defrosting, and the value of S1 is increased; and whether S≥S2 is continuously detected. Specifically, after the time defrosting exit condition is met, the defrosting is checked by temperature and weight to see if it is clean. Under this condition, it is judged that there may be frost, and the defrosting exit time is extended.

[0035] In the control method of this embodiment, see Figure 2 , if T2≤0, G≥G1+0.1; reduce the value of X, the defrost module does not exit defrosting; continue to detect whether S≥S2. Specifically, after the time defrosting exit condition is met, the defrosting is checked by temperature and weight to see if it is clean. Under this condition, it is judged that there is still frost, and the heat transfer coefficient needs to be adjusted and checked. The degree of frost is judged again, and the defrosting time is calculated again to perform defrosting.

[0036] See also Figure 2 In the control method of this embodiment, if 0<T2≤T3, G<G1+0.1, the defrost module exits defrosting; wherein, T3 is a set value, and T3 is greater than 0. At this time, it is judged that the defrosting is clean.

[0037] See also Figure 2 In the control method of this embodiment, if T3<T2≤T4, G≥G1+0.1; after a preset delay time, the defrost module exits defrosting; wherein T4 is greater than T3. At this time, it is judged that the defrosting is basically clean, but there is still a small part of frost that has not fallen into the drain pan.

[0038] See also Figure 2In the control method of this embodiment, if T3<T2≤T4, G<G1+0.1, the defrost module exits defrosting and reduces the value of S1. It is judged that the defrosting is complete, but some water after defrosting is not drained.

[0039] In the control method of this embodiment, see Figure 2 , if T2>T4, G≥G1+0.1, the defrost module exits defrosting; adjust the weighing module 1 of the defrost structure; and / or, if T2>T4, G<G1+0.1; the defrost module exits defrosting; increase the value of X. In this way, it is judged that the defrost is clean, but the defrost electric heating time is too long, and it is judged that the heat transfer coefficient is inaccurate and needs to be corrected.

[0040] Embodiment 1: A weight detection sensor is installed under the evaporator. When the unit is powered on for the first time or the unit is refrigerated for the first time after defrosting, the weight of the evaporator G1 is recorded. During the refrigeration process of the unit, due to the low evaporation temperature, water molecules in the air come into contact with the evaporator and form frost and ice on the evaporator, increasing the weight of the evaporator. A first temperature sensor 3 is fixed to the cold end fin of the unit (keeping a distance of 10mm from the fin) to detect the frost or ice temperature T1. A second temperature sensor 4 is arranged on the refrigerant outlet pipe 2 of the unit to detect the temperature T2. The weight of the evaporator G before defrosting is detected, the heat transfer coefficient X (50%), the defrost power W*X = (G-G1)*(0-T1)*2100+4200*(G-G1), and the electric heating power W1.

[0041] Defrost exit time S2 = W1 / W / 60 + S1 (2min), S1 is the defrost time margin, S1 ≥ 0, defrost time S, when S ≥ S2, detect defrost exit temperature sensor T2.

[0042] If T2≤0, G<G1+0.1; defrost does not exit, S1=S1+1, check whether S≥S2; (after meeting the time defrost exit conditions, check whether the defrost is clean by temperature and weight. Under this condition, it is judged that there may be frost, and the defrost exit time is extended) If T2≤0, G≥G1+0.1; set new X=previous X*0.9, W*X =(G-G1)*(0-T1)*2100+4200*(G-G1), defrost does not exit, check whether S≥S2; (after meeting the time defrost exit conditions, check whether the defrost is clean by temperature and weight. Under this condition, it is judged that there is still frost, and the heat transfer coefficient needs to be adjusted and checked. The degree of frost is judged again, and the defrost time is calculated again to defrost) If 0<T2≤10, G<G1+0.1; exit defrosting; (determine that defrosting is clean) If 0<T2≤10, G≥G1+0.1; set the new S3=previous S3+1, delay S3 (initial value is 0 minutes, which will be adjusted based on 0 minutes later) defrost exit, S3≤3; (defrost is basically clean, but a small part of frost has not fallen into the drain pan) If 10<T2≤20, G≥G1+0.1; defrost exit, delay 1 minute to exit defrost; (defrost is judged to be clean, but some water after defrost is not drained) If 10<T2≤20, G<G1+0.1; defrost exit, S1=S1-1; (defrost is judged to be clean, and the temperature starts to rise after defrosting, and the defrost electric heating time is too long and needs to be adjusted) If 20<T2, G≥G1+0.1; defrost exits, G1=G; (defrost is judged to be clean, but defrost electric heating time is too long, it is judged that weight detection is inaccurate and needs to be corrected) If 20<T2, G<G1+0.1; defrost exits, set new X=previous X*1.1; (defrost is judged to be clean, but defrost electric heating time is too long, it is judged that the heat transfer coefficient is inaccurate and needs to be corrected) It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0043] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments, and this embodiment will not be described in detail here.

[0044] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0045] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0046] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A defrosting structure, characterized in that: include: A weighing module (1), used for detecting the weight of the evaporator; A first temperature detection module, used to detect the temperature of an iced portion of the defrosting structure; A second temperature detection module, used to detect the refrigerant temperature in the refrigerant outlet pipe (2) of the defrost structure; A defrosting module, used for defrosting the icy parts of the defrosting structure; A control module controls the defrosting module according to the weight of the evaporator, the temperature value detected by the first temperature detection module, and the temperature value detected by the second temperature detection module.

2. The defrosting structure according to claim 1, characterized in that: The first temperature detection module comprises a first temperature sensor (3) arranged at the cold end fin of the defrosting structure; and / or, The first temperature detection module comprises a second temperature sensor (4) arranged on the refrigerant outlet pipe (2).

3. The defrosting structure according to claim 1, characterized in that: The first temperature detection module comprises a first temperature sensor (3) for detecting the temperature value of the iced part of the defrosting structure, the first temperature sensors (3) being multiple, and the multiple first temperature sensors (3) being arranged at intervals; and / or, The second temperature detection module comprises a second temperature sensor (4) for detecting the temperature value of the refrigerant in the refrigerant outlet pipe (2) of the defrost structure. There are a plurality of second temperature sensors (4), and the plurality of second temperature sensors (4) are arranged at intervals.

4. An air conditioning system, comprising the defrosting structure according to any one of claims 1 to 3, characterized in that: The air conditioning system comprises: An indoor unit (20) is arranged in a cold storage (10); the evaporator is arranged in the indoor unit (20); An external machine (30) is arranged outside the cold storage (10); one end of the refrigerant outlet pipe (2) of the defrosting structure is connected to the internal machine (20), and the other end of the refrigerant outlet pipe (2) is connected to the external machine (30).

5. A control method, applicable to the defrosting structure according to any one of claims 1 to 3, characterized in that: The control method comprises: The weighing module (1) detects the weight of the evaporator; A first temperature detection module detects a temperature value at an iced portion of the defrosting structure; A second temperature detection module detects the refrigerant temperature value in the refrigerant outlet pipe (2) of the defrost structure; The defrosting module defrosts the frozen parts of the defrosting structure; After defrosting for a period of time, the control module controls the defrosting module according to the weight of the evaporator, the temperature value detected by the first temperature detection module, and the temperature value detected by the second temperature detection module.

6. The control method according to claim 5, characterized in that: The control method comprises: Determining whether the defrosting structure is sufficient; If defrosting is not sufficient, controlling the defrosting structure to perform defrosting; If the defrosting is sufficient, the defrosting structure is controlled to stop defrosting.

7. The control method according to claim 5, characterized in that: The control method comprises: The defrost time S of the defrost structure is calculated, and the defrost exit time S2 of the defrost structure is detected; if the defrost time S≥S2, the defrost module is controlled according to the temperature detected by the second temperature module.

8. The control method according to claim 7, characterized in that: The control method comprises: Detect the weight G of the evaporator before defrosting; Detecting the weight G1 of the evaporator when the defrost structure is powered on for the first time or when the evaporator is cooled for the first time after defrosting; Detecting the temperature T1 of frost or ice; The defrost module is controlled according to the formula W*X = (G-G1)* (0-T1)*2100+4200* (G-G1); wherein X is the heat transfer coefficient; and the units of G and G1 are kg.

9. The control method according to claim 8, characterized in that: According to the formula S2=W1 / W / 60+S1, the defrost exit time S2 of the defrost structure is calculated; wherein S1 is the defrost time margin; W1 is the electric heating power of the defrost module; and W is the defrost power.

10. The control method according to claim 9, characterized in that: When the temperature value T2 detected by the second temperature module is less than or equal to 0, and G is less than or equal to G1+0.1, the defrost module is controlled not to exit defrosting, and the value of S1 is increased; Continue to check whether S≥S2.

11. The control method according to claim 10, characterized in that: If T2≤0, G≥G1+0.1; reduce the value of X, the defrost module does not exit defrosting; Continue to check whether S≥S2.

12. The control method according to claim 10, characterized in that: If 0<T2≤T3, G<G1+0.1, the defrost module exits defrosting; wherein, T3 is a set value, and T3 is greater than 0.

13. The control method according to claim 12, characterized in that: If T3<T2≤T4, G≥G1+0.1; after a preset delay time, the defrost module exits defrosting; wherein T4 is greater than T3.

14. The control method according to claim 12, characterized in that: If T3<T2≤T4, G<G1+0.1; the defrost module exits defrosting and reduces the value of S1.

15. The control method according to claim 12, characterized in that: If T2>T4, G≥G1+0.1, the defrost module exits defrosting; the weighing module (1) of the defrost structure is adjusted; and / or, If T2>T4, G<G1+0.1; the defrost module exits defrosting; and the value of X is increased.

Images