Pipeline leakage detecting and switching system and air conditioner

Abstract

The utility model discloses a pipeline leakage detection and switching system and an air conditioner, comprising a main pipeline which is provided with a plurality of main pipe sections which are sequentially connected along a refrigerant flowing direction, the starting end and the tail end of each main pipe section are respectively provided with a first electromagnetic valve and a second electromagnetic valve, and a first pressure sensor is arranged in each main pipe section; the first standby pipeline is provided with a plurality of first standby pipe sections corresponding to the main pipe sections, and the starting end of each first standby pipe section communicates with the side, facing the refrigerant countercurrent direction, of the first electromagnetic valve of the corresponding main pipe section through a first connecting pipe; and each first connecting pipe is provided with a first standby electromagnetic valve. When leakage of the main pipe section is detected through the first pressure sensor, the main pipe section is switched to the corresponding first standby pipe section, flammable and explosive gas is prevented from leaking into the main pipe section, in this way, the temperature of refrigerants can be maintained, extra energy consumption can be reduced, and potential safety hazards such as detonation and explosion of a system can be eliminated.

Description

Technical Field

[0001] The utility model relates to the field of measurement technology, in particular to a pipeline leakage detection and switching system and an air conditioner. Background Art

[0002] At present, the market demand for mine air conditioners is increasing day by day. Mine air conditioners are equipped with positive pressure explosion-proof systems, and the pressure in the positive pressure explosion-proof systems is greater than 50kPa to prevent flammable and explosive gases in dangerous gas environments such as mines from entering the mine air conditioners. When it is detected that the pressure P0 in the positive pressure explosion-proof system is 50kPa<P0<55kPa or P0≤50kPa, it can be considered that the positive pressure explosion-proof system is at risk of failure.

[0003] Moreover, the place where mine excavation work is located is narrow and the conditions are poor. It is the place where gas and coal dust are generated and gathered. When the positive pressure explosion-proof system fails, gas and other flammable and explosive gases will leak into the pipes within the positive pressure explosion-proof system. In order not to affect the mine operation, the mine air conditioner cannot be shut down at any time. This not only affects the cooling effect of the mine air conditioner, increases the energy consumption of the positive pressure explosion-proof system, but also poses safety hazards such as deflagration and explosion. Utility Model Content

[0004] In view of this, the utility model provides a pipeline leakage detection and switching system and an air conditioner, which are used to solve the problem in the prior art that when a pipeline leaks, the leaking pipeline cannot be detected and other spare pipelines cannot be switched.

[0005] To achieve one or part or all of the above purposes or other purposes, the technical solution of the utility model is a pipeline leakage detection and switching system, including a main pipeline connected between an air conditioner condenser and an evaporator, the main pipeline is provided with a plurality of main pipeline sections connected in sequence along the flow direction of the refrigerant, the beginning and the end of each main pipeline section are respectively provided with a first solenoid valve and a second solenoid valve, and each main pipeline section is also provided with a first pressure sensor;

[0006] The system further comprises a first spare pipeline, wherein the first spare pipeline is provided with a plurality of first spare pipeline sections corresponding to the main pipeline section, and the starting end of each first spare pipeline section is connected to a side of the first solenoid valve of the corresponding main pipeline section toward the refrigerant counterflow direction through a first connecting pipe;

[0007] Each of the first connecting pipes is provided with a first standby solenoid valve.

[0008] Furthermore, the first spare pipe section closest to the refrigerant outlet of the condenser is the starting first spare pipe section, and the starting ends of the remaining first spare pipe sections except the starting first spare pipe section are all provided with a second spare solenoid valve.

[0009] Furthermore, each of the first spare pipe sections is provided with a second pressure sensor.

[0010] Furthermore, the system further comprises a second spare pipeline, each of the second spare pipelines is provided with at least one second spare pipeline section corresponding to the main pipeline section, and the starting end of each second spare pipeline section is connected to the side of the second solenoid valve of the corresponding main pipeline section toward the flow direction of the refrigerant through a second connecting pipe;

[0011] Each of the second connecting pipes is provided with a third standby solenoid valve.

[0012] Furthermore, the second spare pipe section closest to the refrigerant input port of the evaporator is the terminal second spare pipe section;

[0013] The remaining second spare pipe sections except the terminal second spare pipe section are also connected to the side of the second solenoid valve of the corresponding main pipe section facing the refrigerant counterflow direction through the third connecting pipe;

[0014] Each of the third connecting pipes is provided with a fourth standby solenoid valve.

[0015] Furthermore, the second spare pipe section closest to the refrigerant outlet of the condenser is the starting second spare pipe section, and the starting ends of the remaining second spare pipe sections except the starting second spare pipe section are all provided with a fifth spare solenoid valve.

[0016] Furthermore, each of the second spare pipe sections is provided with a third pressure sensor.

[0017] Furthermore, each of the main pipe sections is also provided with at least one of a gas detection sensor, a hydrogen detection sensor, a carbon monoxide detection sensor and an acetylene detection sensor.

[0018] Furthermore, a main solenoid valve is provided between the refrigerant outlet of the condenser and the main pipeline.

[0019] The utility model also provides an air conditioner, comprising the above-mentioned pipeline leakage detection and switching system.

[0020] Compared with the prior art, the utility model has at least the following beneficial effects:

[0021] When the utility model detects a leak in the main pipe section through the first pressure sensor, it will switch to the corresponding first spare pipe section to prevent flammable and explosive gases such as gas from leaking into the main pipe section and flowing with the refrigerant. This not only maintains the temperature of the refrigerant, reduces the refrigerant loss caused by pipeline leakage and the additional energy consumption required for the system to frequently compensate for the refrigerant, but also eliminates safety hazards such as deflagration and explosion in the system, thereby ensuring the life safety of surrounding personnel and the property safety of surrounding facilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present invention; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present invention or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order.

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 A schematic diagram of a portion of the internal structure of the air conditioner proposed by the utility model;

[0025] Figure 2 This is a schematic diagram of the first pipeline leakage detection and switching system proposed by the utility model;

[0026] Figure 3 This is a schematic diagram of a second pipeline leakage detection and switching system proposed by the utility model;

[0027] Figure 4 This is a schematic diagram of a third pipeline leakage detection and switching system proposed by the utility model;

[0028] Figure 5 This is a schematic diagram of the fourth pipeline leakage detection and switching system proposed by the utility model.

[0029] Reference numerals:

[0030] 1. Condenser;

[0031] 2. Evaporator;

[0032] 3. Main road;

[0033] 31. Supervisor section; 311. Supervisor section A; 312. Supervisor section B; 313. Supervisor section C; 314. Supervisor section D;

[0034] 32. First solenoid valve; 33. Second solenoid valve; 34. First pressure sensor; 35. Main solenoid valve; 36. Third solenoid valve; 37. Fourth solenoid valve; 38. Fourth pressure sensor;

[0035] 4. The first backup pipeline;

[0036] 41. First spare pipe section; 411. First spare pipe section A; 412. First spare pipe section B; 413. First spare pipe section C; 414. First spare pipe section D;

[0037] 42. First connecting pipe; 43. First standby solenoid valve; 44. Second standby solenoid valve; 45. Second pressure sensor;

[0038] 5. Second backup pipeline;

[0039] 51, second spare pipe section; 511, second spare pipe section A; 512, second spare pipe section B; 513, second spare pipe section C;

[0040] 52. Second connecting pipe; 53. Third spare solenoid valve; 54. Third connecting pipe; 55. Fourth spare solenoid valve; 56. Fifth spare solenoid valve; 57. Third pressure sensor;

[0041] 6. The third spare pipeline;

[0042] 61. fourth connecting pipe; 62. sixth standby solenoid valve;

[0043] 7. Compressor. DETAILED DESCRIPTION

[0044] In order to make the technical problems, technical solutions and beneficial effects to be solved by the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model. Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the utility model, rather than implying that each embodiment of the utility model must have the described features. In addition, it should be noted that this specification describes many features. Although certain features can be combined together to illustrate possible system designs, these features can also be used in other combinations that are not explicitly described. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0045] The principle and structure of the present utility model are described in detail below with reference to the accompanying drawings and embodiments.

[0046] Among them, the pipeline leakage detection and switching system proposed by the utility model is applied to the positive pressure explosion-proof system in the air conditioner to detect in real time whether the pipeline in the positive pressure explosion-proof system is leaking, and switch the leaking pipeline to a spare pipeline without leakage.

[0047] Specifically, refer to the attached Figure 1 The utility model proposes a schematic diagram of a connection structure between a condenser 1 and an evaporator 2, wherein a compressor 7 is provided between a refrigerant input port of the condenser 1 and a refrigerant output port of the evaporator 2, the refrigerant output port of the condenser 1 is connected to a refrigerant input port of the evaporator 2 through a main line 3, and a main line between the refrigerant output port of the condenser 1 and the refrigerant input port of the evaporator 2 is provided with a pipeline leakage detection and switching system.

[0048] Example 1

[0049] Refer to the attached Figure 2 The utility model proposes a pipeline leakage detection and switching system, including a main pipeline 3 located between the refrigerant outlet of the condenser 1 and the refrigerant inlet of the evaporator 2, the main pipeline 3 is provided with a plurality of main pipeline sections 31 sequentially connected along the refrigerant flow direction, the beginning and the end of each main pipeline section 31 are respectively provided with a first solenoid valve 32 and a second solenoid valve 33, and each main pipeline section 31 is also provided with a first pressure sensor 34.

[0050] The system also includes a first backup pipeline 4, which is provided with multiple first backup pipeline sections 41 corresponding to the main pipeline section 31, and the starting end of each first backup pipeline section 41 is connected to the side of the first solenoid valve 32 of the corresponding main pipeline section 31 toward the counterflow direction of the refrigerant through a first connecting pipe 42.

[0051] Each of the first connecting pipes 42 is provided with a first standby solenoid valve 43 .

[0052] Among them, the pipeline leakage detection and switching system is also provided with a control center (not shown, the same throughout), and the control center is electrically connected to all first pressure sensors 34, all first solenoid valves 32, all second solenoid valves 33 and all first backup solenoid valves 43 respectively.

[0053] When the pipeline leakage detection and switching system is started or on standby, each first pressure sensor 34 will detect the pressure in the corresponding main pipe section 31 in real time and upload it to the control center. All first solenoid valves 32, all second solenoid valves 33 and the main solenoid valve 35 remain in the open state, and all first standby solenoid valves 43 and all second standby solenoid valves 44 remain in the closed state.

[0054] If the first pressure sensor 34 detects that the pressure in the corresponding main pipe section 31 is [45kPa, 55kPa], the control center will determine that the main pipe section 31 is leaking, and will shut down the first solenoid valve 32 and the second solenoid valve 33 of the corresponding main pipe section 31, and then only open the first standby solenoid valve 43 of the corresponding first standby pipe section 41, so that the refrigerant no longer flows through the leaking main pipe section 31, but flows through the first standby pipe section 41 corresponding to the leaking main pipe section 31, and then flows back to the next main pipe section 31 connected in sequence along the refrigerant flow direction, so as to prevent flammable and explosive gases such as gas from leaking into the main pipe section 31 and flowing with the refrigerant. This can not only maintain the temperature of the refrigerant, reduce the refrigerant loss caused by pipeline leakage and the additional energy consumption required for the system to frequently compensate for the refrigerant, but also eliminate the safety hazards such as deflagration and explosion in the system, and ensure the life safety of surrounding personnel and the property safety of surrounding facilities.

[0055] In order to prevent the refrigerant from flowing through the corresponding first spare pipe section 41 and then flowing through the next first spare pipe section 41 connected in sequence along the refrigerant flow direction, thereby causing the refrigerant to generate additional energy consumption and reduce the cooling effect of the air conditioner, refer to the attached Figure 2 The first spare pipe section 41 closest to the refrigerant outlet of the condenser 1 is the first spare pipe section at the starting end. Except for the first spare pipe section at the starting end, the starting ends of the remaining first spare pipe sections 41 are all provided with second spare solenoid valves 44, and the control center is electrically connected to all the second spare solenoid valves 44 respectively.

[0056] In this way, when the refrigerant flows through the corresponding first spare pipe section 41 and then flows into the next main pipe section 31 connected sequentially along the refrigerant flow direction, the refrigerant will not flow into the next first spare pipe section 41 connected sequentially along the refrigerant flow direction, so that the refrigerant will not generate additional energy consumption and the cooling effect of the air conditioner will not be reduced.

[0057] In order to enable the control center to detect in real time whether leakage occurs in each first spare pipe section 41, refer to the attached Figure 2 Each of the first spare pipe sections 41 is provided with a second pressure sensor 45 .

[0058] If both the main pipe section 31 and the corresponding first spare pipe section 41 leak, and the pressures in the main pipe section 31 and the corresponding first spare pipe section 41 are both at [45kPa, 55kPa], the control center will promptly notify the maintenance personnel to perform repairs to ensure the normal operation of the pipeline leakage detection and switching system; if the pressure in the main pipe section 31 and / or the corresponding first spare pipe section 41 is less than 45kPa, the control center will directly stop the operation of the pipeline leakage detection and switching system and the corresponding air conditioner, and restart the pipeline leakage detection and switching system after the maintenance personnel successfully perform the repair.

[0059] In order to enable the control center to control whether the refrigerant flowing out of the refrigerant outlet of the condenser 1 flows into the main line 3, refer to the attached Figure 2 A main solenoid valve 35 is provided between the refrigerant outlet of the condenser 1 and the main line 3 .

[0060] In this way, when both the main line 3 and the first backup line 4 leak, or even leak severely, the control center will shut off the main solenoid valve 35 to prevent the refrigerant from flowing into the main line 3 and the first backup line 4, so as to prevent flammable and explosive gases such as gas from leaking into the main section 31 and flowing with the refrigerant. This can not only maintain the temperature of the refrigerant, reduce the refrigerant loss caused by pipeline leakage and the additional energy consumption required for the system to frequently compensate for the refrigerant, but also eliminate safety hazards such as deflagration and explosion in the system, and ensure the life safety of surrounding personnel and the property safety of surrounding facilities.

[0061] Among them, in order to facilitate the detection of the specific composition of the flammable and explosive gases entering the corresponding main pipe section 31 when a leak occurs in the main pipe section 31, because the conditions for combustion and explosion of different gases are different, each of the main pipe sections 31 is also provided with at least one of a gas detection sensor, a hydrogen detection sensor, a carbon monoxide detection sensor and an acetylene detection sensor to detect the concentration of the flammable and explosive gases entering the corresponding main pipe section 31.

[0062] Of course, according to actual conditions, a hydrogen sulfide detection sensor, an ethane detection sensor or other flammable and explosive gas detection sensors can be further arranged in the main pipe section 31. Alternatively, a combustible gas detector can be used to widely detect a variety of flammable and explosive gases, including but not limited to methane, ethane, propane, etc.

[0063] For easier understanding, please refer to the attached Figure 3 In this embodiment, the main pipe sections 31 sequentially connected along the refrigerant flow direction in the main pipe 3 are set to four, namely, main pipe section A311, main pipe section B312, main pipe section C313 and main pipe section D314; correspondingly, the first spare pipe line 4 is also provided with four first spare pipe sections 41 sequentially connected along the refrigerant flow direction, namely, the first spare pipe section A411, the first spare pipe section B412, the first spare pipe section C413 and the first spare pipe section D414.

[0064] Among them, the starting end of the main pipe section A311 and the starting end of the first spare pipe section A411 are respectively connected to the refrigerant outlet of the condenser 1, and the end of the main pipe section D314 and the end of the first spare pipe section D414 are respectively connected to the refrigerant inlet of the evaporator 2.

[0065] A first solenoid valve 32 is provided at the beginning of the main pipe section A311, the main pipe section B312, the main pipe section C313 and the main pipe section D314, a second solenoid valve 33 is provided at the end of the main pipe section A311, the main pipe section B312, the main pipe section C313 and the main pipe section D314, and a first pressure sensor 34 is provided inside the main pipe section A311, the main pipe section B312, the main pipe section C313 and the main pipe section D314.

[0066] A second pressure sensor 45 is provided inside the first spare pipe section A411, the first spare pipe section B412, the first spare pipe section C413 and the first spare pipe section D414, and a second spare solenoid valve 44 is provided at the beginning of the first spare pipe section B412, the first spare pipe section C413 and the first spare pipe section D414.

[0067] The starting end of the first spare pipe section A411 is connected to the side of the first solenoid valve 32 of the main pipe section A311 facing the countercurrent direction of the refrigerant through the first connecting pipe 42; the starting end of the first spare pipe section B412 is connected to the side of the second solenoid valve 33 of the main pipe section A311 facing the countercurrent direction of the refrigerant and the side of the first solenoid valve 32 of the main pipe section B312 facing the countercurrent direction of the refrigerant through the first connecting pipe 42; the starting end of the first spare pipe section C413 is connected to the side of the second solenoid valve 33 of the main pipe section B312 facing the countercurrent direction of the refrigerant and the side of the first solenoid valve 32 of the main pipe section C313 facing the countercurrent direction of the refrigerant through the first connecting pipe 42; the starting end of the first spare pipe section D414 is connected to the side of the second solenoid valve 33 of the main pipe section C313 facing the countercurrent direction of the refrigerant and the side of the first solenoid valve 32 of the main pipe section D314 facing the countercurrent direction of the refrigerant through the first connecting pipe 42; and a first spare solenoid valve 43 is provided on each of the first connecting pipes 42.

[0068] When leakage occurs in the main pipeline 3, any of the following situations or other related situations may exist:

[0069] Case 1: For any main pipe section 31 , this embodiment takes the main pipe section A 311 as an example.

[0070] 1. If the first pressure sensor 34 of the main pipe section A311 detects that the pressure P1 of the main pipe section A311 is greater than 55 kPa, it means that the pressure P1 in the main pipe section A311 is normal, there is no failure of the positive pressure explosion-proof system of the main pipe section A311, and the air conditioner operates normally.

[0071] 2. If the first pressure sensor 34 of the main pipe section A311 detects that the pressure P1 of the main pipe section A311 is between 50kPa≤P1≤55kPa, although the positive pressure explosion-proof system of the main pipe section A311 fails, the pressure P1>50kPa, indicating that the pressure P1 in the main pipe section A311 is still positive pressure. At this time, the control center determines that the leakage of the main pipe section A311 is small. At this time, the control center only closes the first solenoid valve 32 and the second solenoid valve 33 of the main pipe section A311, and then only opens the first standby solenoid valve 43 of the first standby pipe section A411 and the first standby pipe section B412, so that the refrigerant flowing out of the refrigerant outlet of the condenser 1 flows through the first standby pipe section A411, the main pipe section B312, the main pipe section C313 and the main pipe section D314 in turn, and then flows to the refrigerant inlet of the evaporator 2.

[0072] 3. If the first pressure sensor 34 of the main pipe section A311 detects that the pressure P1 of the main pipe section A311 is 45kPa≤P1<50kPa, at this time, although the positive pressure explosion-proof system of the main pipe section A311 fails, the pressure P1≥45kPa, indicating that although the pressure P1 in the main pipe section A311 is negative pressure, the deviation does not exceed 5kPa. At this time, the control center still determines that the leakage of the main pipe section A311 is small. At this time, the control center controls the condenser 1 to increase the output of the refrigerant. To increase the pressure P1 in the main pipe section A311, the control center only closes the first solenoid valve 32 and the second solenoid valve 33 of the main pipe section A311, and then only opens the first spare solenoid valve 43 of the first spare pipe section A411 and the first spare pipe section B412, so that the refrigerant flowing out of the refrigerant outlet of the condenser 1 flows through the first spare pipe section A411, the main pipe section B312, the main pipe section C313 and the main pipe section D314 in turn, and then flows to the refrigerant inlet of the evaporator 2.

[0073] 4. If the first pressure sensor 34 of the main pipe section A311 detects that the pressure P1 of the main pipe section A311 is less than 45 kPa, the positive pressure explosion-proof system of the main pipe section A311 fails and the pressure P1 is less than 45 kPa. The control center determines that the leakage of the main pipe section A311 is large. The control center first turns off the main solenoid valve 35, shuts down the air conditioner, and then notifies the maintenance personnel to carry out timely maintenance to prevent flammable and explosive gases such as gas from leaking into the main pipe section 31 and flowing with the refrigerant. This can not only maintain the temperature of the refrigerant, reduce the refrigerant loss caused by pipeline leakage and the additional energy consumption required for the system to frequently compensate for the refrigerant, but also eliminate the safety hazards such as deflagration and explosion in the system, and ensure the life safety of surrounding personnel and the property safety of surrounding facilities.

[0074] Case 2: For any two consecutive main pipe sections 31 , this embodiment takes main pipe section A 311 and main pipe section B 312 as examples for illustration.

[0075] 1. If the first pressure sensors 34 of the main pipe section A311 and the main pipe section B312 detect that the pressure P2 of the main pipe section A311 and the main pipe section B312 is greater than 55 kPa, it means that the pressure P2 in the main pipe section A311 and the main pipe section B312 is normal, there is no failure problem of the positive pressure explosion-proof system of the main pipe section A311 and the main pipe section B312, and the air conditioner operates normally.

[0076] 2. If the first pressure sensors 34 of the main pipe section A311 and the main pipe section B312 both detect that the pressure P2 of the main pipe section A311 and the main pipe section B312 is 50kPa≤P2≤55kPa, at this time, although the positive pressure explosion-proof system of the main pipe section A311 and the main pipe section B312 fails, the pressure P2>50kPa, indicating that the pressure P2 in the main pipe section A311 and the main pipe section B312 is still positive pressure. At this time, the control center determines that the leakage of the main pipe section A311 and the main pipe section B312 is small, and the control center The control center only closes the first solenoid valve 32 and the second solenoid valve 33 of the main pipe section A311 and the main pipe section B312, and then only opens the first spare solenoid valve 43 of the first spare pipe section A411 and the first spare pipe section C413, and the second spare solenoid valve 44 of the first spare pipe section B412, so that the refrigerant flowing out of the refrigerant outlet of the condenser 1 flows through the first spare pipe section A411, the first spare pipe section B412, the main pipe section C313 and the main pipe section D314 in sequence, and then flows to the refrigerant inlet of the evaporator 2.

[0077] 3. If the first pressure sensors 34 of the main pipe section A311 and the main pipe section B312 both detect that the pressure P2 of the main pipe section A311 and the main pipe section B312 is 45kPa≤P2<50kPa, at this time, although the positive pressure explosion-proof system of the main pipe section A311 and the main pipe section B312 fails, the pressure P2≥45kPa, indicating that the pressure P2 in the main pipe section A311 and the main pipe section B312 is negative pressure but the deviation does not exceed 5kPa. At this time, the control center still determines that the leakage of the main pipe section A311 and the main pipe section B312 is small, and the control center controls the condenser 1 to increase the output of the refrigerant. , to increase the pressure P2 in the main pipe section A311 and the main pipe section B312, and at the same time, the control center only closes the first solenoid valve 32 and the second solenoid valve 33 of the main pipe section A311 and the main pipe section B312, and the control center then only opens the first spare solenoid valve 43 of the first spare pipe section A411 and the first spare pipe section C413, and the second spare solenoid valve 44 of the first spare pipe section B412, so that the refrigerant flowing out of the refrigerant outlet of the condenser 1 flows through the first spare pipe section A411, the first spare pipe section B412, the main pipe section C313 and the main pipe section D314 in sequence, and then flows to the refrigerant inlet of the evaporator 2.

[0078] 4. If the first pressure sensor 34 of the main section A311 and the main section B312 detects that the pressure P2 of the main section A311 and / or the main section B312 is less than 45 kPa, the positive pressure explosion-proof system of the main section A311 and / or the main section B312 fails, and the pressure P2 is less than 45 kPa. The control center determines that the leakage of the main section A311 and / or the main section B312 is large. The control center first turns off the main solenoid valve 35, then shuts down the air conditioner, and then notifies the maintenance personnel to carry out timely maintenance to prevent flammable and explosive gases such as gas from leaking into the main section 31 and flowing with the refrigerant. This can not only maintain the temperature of the refrigerant, reduce the refrigerant loss caused by pipeline leakage and the additional energy consumption required for the system to frequently compensate for the refrigerant, but also eliminate the safety hazards such as deflagration and explosion in the system, and ensure the life safety of surrounding personnel and the property safety of surrounding facilities.

[0079] Case 3: For at least two discontinuous main pipe sections 31 , this embodiment takes main pipe section A 311 and main pipe section C 313 as examples.

[0080] 1. If the first pressure sensors 34 of the main pipe section A311 and the main pipe section C313 both detect that the pressure P3 of the main pipe section A311 and the main pipe section B312 is greater than 55 kPa, it means that the pressure P3 in the main pipe section A311 and the main pipe section C313 is normal, there is no failure problem of the positive pressure explosion-proof system of the main pipe section A311 and the main pipe section C313, and the air conditioner operates normally.

[0081] 2. If the first pressure sensors 34 of the main pipe section A311 and the main pipe section C313 both detect that the pressure P3 of the main pipe section A311 and the main pipe section C313 is 50kPa≤P3≤55kPa, at this time, although the positive pressure explosion-proof system of the main pipe section A311 and the main pipe section C313 fails, the pressure P3>50kPa, indicating that the pressure P3 in the main pipe section A311 and the main pipe section C313 is still positive pressure. At this time, the control center determines that the leakage of the main pipe section A311 and the main pipe section C313 is small, and at this time the control center only shuts off the main pipe section A311. 11 and the first solenoid valve 32 and the second solenoid valve 33 of the main pipe section C313, the control center then only opens the first spare pipe section A411, the first spare pipe section B412, the first spare pipe section C413 and the first spare pipe section D414, and the second spare solenoid valve 44 of the first spare pipe section C413, so that the refrigerant flowing out of the refrigerant outlet of the condenser 1 flows through the first spare pipe section A411, the main pipe section B312, the first spare pipe section C413 and the main pipe section D314 in sequence, and then flows to the refrigerant inlet of the evaporator 2.

[0082] 3. If the first pressure sensors 34 of the main pipe section A311 and the main pipe section C313 both detect that the pressure P3 of the main pipe section A311 and the main pipe section C313 is 45kPa≤P3<50kPa, at this time, although the positive pressure explosion-proof system of the main pipe section A311 and the main pipe section C313 fails, the pressure P3≥45kPa, indicating that the pressure P3 in the main pipe section A311 and the main pipe section C313 is negative pressure but the deviation does not exceed 5kPa. At this time, the control center still determines that the leakage of the main pipe section A311 and the main pipe section C313 is small. At this time, the control center controls the condenser 1 to increase the output of the refrigerant to increase the main pipe section A311. and the pressure P3 in the main pipe section C313, and at the same time, the control center only shuts off the first solenoid valve 32 and the second solenoid valve 33 of the main pipe section A311 and the main pipe section C313, and then the control center only opens the first spare pipe section A411, the first spare pipe section B412, the first spare pipe section C413 and the first spare pipe section D414, and the second spare solenoid valve 44 of the first spare pipe section C413, so that the refrigerant flowing out of the refrigerant outlet of the condenser 1 flows through the first spare pipe section A411, the main pipe section B312, the first spare pipe section C413 and the main pipe section D314 in sequence, and then flows to the refrigerant inlet of the evaporator 2.

[0083] 4. If the first pressure sensor 34 of the main section A311 and the main section C313 detects that the pressure P3 of the main section A311 and / or the main section C313 is less than 45 kPa, the positive pressure explosion-proof system of the main section A311 and / or the main section C313 fails, and the pressure P3 is less than 45 kPa. The control center determines that the leakage of the main section A311 and / or the main section C313 is large. The control center first turns off the main solenoid valve 35, then shuts down the air conditioner, and then notifies the maintenance personnel to carry out timely maintenance to prevent flammable and explosive gases such as gas from leaking into the main section 31 and flowing with the refrigerant. This can not only maintain the temperature of the refrigerant, reduce the refrigerant loss caused by pipeline leakage and the additional energy consumption required for the system to frequently compensate for the refrigerant, but also eliminate the safety hazards such as deflagration and explosion in the system, and ensure the life safety of surrounding personnel and the property safety of surrounding facilities.

[0084] Example 2

[0085] Refer to the attached Figure 2 The utility model proposes a pipeline leakage detection and switching system, including a main pipeline 3 located between the refrigerant outlet of the condenser 1 and the refrigerant inlet of the evaporator 2, the main pipeline 3 is provided with a plurality of main pipeline sections 31 sequentially connected along the refrigerant flow direction, the beginning and the end of each main pipeline section 31 are respectively provided with a first solenoid valve 32 and a second solenoid valve 33, and each main pipeline section 31 is also provided with a first pressure sensor 34.

[0086] The system also includes a first backup pipeline 4, which is provided with multiple first backup pipeline sections 41 corresponding to the main pipeline section 31, and the starting end of each first backup pipeline section 41 is connected to the side of the first solenoid valve 32 of the corresponding main pipeline section 31 toward the counterflow direction of the refrigerant through a first connecting pipe 42.

[0087] Each of the first connecting pipes 42 is provided with a first standby solenoid valve 43 , and each of the first standby pipe sections 41 is provided with a second pressure sensor 45 .

[0088] The first spare pipe section 41 closest to the refrigerant outlet of the condenser 1 is the starting first spare pipe section, and the starting ends of the remaining first spare pipe sections 41 except the starting first spare pipe section are all provided with a second spare solenoid valve 44 .

[0089] The system also includes a second backup pipeline 5, each of which is provided with at least one second backup pipeline section 51 corresponding to the main pipeline section 31, and the starting end of each second backup pipeline section 51 is connected to the side of the second solenoid valve 33 of the corresponding main pipeline section 31 toward the refrigerant flow direction through a second connecting pipe 52.

[0090] Each of the second connecting pipes 52 is provided with a third standby solenoid valve 53 .

[0091] The premise for switching and using the second backup pipeline 5 is that there is no leakage in the main pipe section 31 closest to the refrigerant outlet of the condenser 1 ; if there is a leakage in the main pipe section 31 closest to the refrigerant outlet of the condenser 1 , only the first backup pipeline 4 can be switched and used.

[0092] The control center is electrically connected to all first pressure sensors 34 , all second pressure sensors 45 , all first solenoid valves 32 , all second solenoid valves 33 , all first backup solenoid valves 43 , all second backup solenoid valves 44 and all third backup solenoid valves 53 .

[0093] When the pipeline leakage detection and switching system is started or on standby, each first pressure sensor 34, each second pressure sensor 45 and each third pressure sensor 57 will detect the pressure in the corresponding main pipe section 31 in real time and upload it to the control center, all first solenoid valves 32, all second solenoid valves 33 and the main solenoid valve 35 remain in the open state, and all first standby solenoid valves 43, all second standby solenoid valves 44, the third standby solenoid valve 53, the fourth standby solenoid valve 55 and the fifth standby solenoid valve 56 remain in the closed state.

[0094] If the first pressure sensor 34 detects that the pressure in the corresponding main pipe section 31 is [45kPa, 55kPa], the control center will determine that the main pipe section 31 is leaking, and will shut down the first solenoid valve 32 and the second solenoid valve 33 of the corresponding main pipe section 31, and then only open the third standby solenoid valve 53 of the corresponding second standby pipe section 51, so that the refrigerant no longer flows through the leaking main pipe section 31, but flows through the second standby pipe section 51 corresponding to the leaking main pipe section 31, and then flows back to the next main pipe section 31 connected in sequence along the refrigerant flow direction, so as to prevent flammable and explosive gases such as gas from leaking into the main pipe section 31 and flowing with the refrigerant. This can not only maintain the temperature of the refrigerant, reduce the refrigerant loss caused by pipeline leakage and the additional energy consumption required for the system to frequently compensate for the refrigerant, but also eliminate the safety hazards such as deflagration and explosion in the system, and ensure the life safety of surrounding personnel and the property safety of surrounding facilities.

[0095] Among them, because the number of the second spare pipe sections 51 is one less than the number of the main pipe sections 31, refer to the attached Figure 2 The second spare pipe section 51 closest to the refrigerant input port of the evaporator 2 is the terminal second spare pipe section.

[0096] The remaining second spare pipe sections 51 except the terminal second spare pipe section are also connected to the side of the second solenoid valve 33 of the corresponding main pipe section 31 facing the refrigerant counterflow direction through the third connecting pipe 54.

[0097] Each of the third connecting pipes 54 is provided with a fourth standby solenoid valve 55 , and all the fourth standby solenoid valves 55 are electrically connected to the control center respectively.

[0098] In this way, the control center can switch the corresponding adjacent main pipe sections 31 by controlling the third backup solenoid valve 53 and the fourth backup solenoid valve 55 on the second connecting pipe 52 and the third connecting pipe 54 adjacent to the corresponding second solenoid valve 33, so as to prevent flammable and explosive gases such as gas from leaking into the main pipe section 31 and flowing with the refrigerant. This can not only maintain the temperature of the refrigerant, reduce the refrigerant loss caused by pipeline leakage and the additional energy consumption required for the system to frequently compensate for the refrigerant, but also eliminate safety hazards such as deflagration and explosion in the system, and ensure the life safety of surrounding personnel and the property safety of surrounding facilities.

[0099] In order to prevent the refrigerant from flowing through the corresponding second spare pipe section 51 and then flowing through the next second spare pipe section 51 connected in sequence along the refrigerant flow direction, thereby causing the refrigerant to generate additional energy consumption and reduce the cooling effect of the air conditioner, refer to the attached Figure 2The second spare pipe section 51 closest to the refrigerant outlet of the condenser 1 is the starting second spare pipe section. Except for the starting second spare pipe section, the starting ends of the remaining second spare pipe sections 51 are all provided with fifth spare solenoid valves 56, and all fifth spare solenoid valves 56 are electrically connected to the control center respectively.

[0100] In order to enable the control center to detect in real time whether leakage occurs in each second spare pipe section 51, refer to the attached Figure 2 Each of the second spare pipe sections 51 is provided with a third pressure sensor 57 .

[0101] If both the main pipe section 31 and the corresponding second spare pipe section 51 leak, and the pressures in the main pipe section 31 and the corresponding second spare pipe section 51 are both at [45kPa, 55kPa], the control center will promptly notify the maintenance personnel to perform repairs to ensure the normal operation of the pipeline leakage detection and switching system; if the pressure in the main pipe section 31 and / or the corresponding second spare pipe section 51 is less than 45kPa, the control center will directly stop the operation of the pipeline leakage detection and switching system and the corresponding air conditioner, and restart the pipeline leakage detection and switching system after the maintenance personnel successfully completes the repair.

[0102] For easier understanding, please refer to the attached Figure 4 In this embodiment, the main pipe sections 31 in the main pipe 3 that are sequentially connected along the refrigerant flow direction are set to four, namely, main pipe section A311, main pipe section B312, main pipe section C313 and main pipe section D314; correspondingly, the second spare pipe line 5 is provided with three second spare pipe sections 51 that are sequentially connected along the refrigerant flow direction, namely, second spare pipe section A511, second spare pipe section B512 and second spare pipe section C513.

[0103] Among them, the starting end of the main pipe section A311 is connected to the refrigerant outlet of the condenser 1, and the end of the main pipe section D314 and the end of the second spare pipe section C513 are respectively connected to the refrigerant inlet of the evaporator 2; a main solenoid valve 35 is provided between the refrigerant outlet of the condenser 1 and the first solenoid valve 32 of the main pipe section A311.

[0104] A first solenoid valve 32 is provided at the beginning of each of the main pipe sections A311, B312, C313 and D314, a second solenoid valve 33 is provided at the end of each of the main pipe sections A311, B312, C313 and D314, and a first pressure sensor 34 is provided inside each of the main pipe sections A311, B312, C313 and D314. A third pressure sensor 57 is provided inside each of the second spare pipe sections A511, B512 and C513.

[0105] The starting end of the second spare pipe section A511 is connected to the side of the second solenoid valve 33 of the main pipe section A311 facing the refrigerant flow direction, and the side of the first solenoid valve 32 of the main pipe section B312 facing the refrigerant counterflow direction through the second connecting pipe 52; the starting end of the second spare pipe section B512 is connected to the side of the second solenoid valve 33 of the main pipe section B312 facing the refrigerant flow direction, and the side of the first solenoid valve 32 of the main pipe section C313 facing the refrigerant counterflow direction through the second connecting pipe 52; the starting end of the second spare pipe section C513 is connected to the side of the second solenoid valve 33 of the main pipe section C313 facing the refrigerant flow direction, and the side of the first solenoid valve 32 of the main pipe section D314 facing the refrigerant counterflow direction through the second connecting pipe 52.

[0106] The end of the second spare pipe section A511 is connected to the side of the second solenoid valve 33 of the main pipe section B312 facing the counterflow direction of the refrigerant through the third connecting pipe 54; the end of the second spare pipe section B512 is connected to the side of the second solenoid valve 33 of the main pipe section C313 facing the counterflow direction of the refrigerant through the third connecting pipe 54.

[0107] Each second connecting pipe 52 is provided with a third standby solenoid valve 53 ; each third connecting pipe 54 is provided with a fourth standby solenoid valve 55 ; and the beginning ends of the second standby pipe section B512 and the second standby pipe section C513 are both provided with a fifth standby solenoid valve 56 .

[0108] When the main pipeline 3 leaks, and it is determined that the main pipe section A311 does not leak, and only the second backup pipeline 5 is used, any of the following situations or other related situations may exist:

[0109] Case 1: For any main pipe section 31, this embodiment takes the main pipe section C313 as an example for explanation.

[0110] 1. If the first pressure sensor 34 of the main pipe section C313 detects that the pressure P1 of the main pipe section C313 is greater than 55 kPa, it means that the pressure P1 in the main pipe section C313 is normal, there is no failure of the positive pressure explosion-proof system of the main pipe section C313, and the air conditioner operates normally.

[0111] 2. If the first pressure sensor 34 of the main pipe section C313 detects that the pressure P1 of the main pipe section C313 is between 50kPa≤P1≤55kPa, although the positive pressure explosion-proof system of the main pipe section C313 fails, the pressure P1>50kPa, indicating that the pressure P1 in the main pipe section C313 is still positive pressure. At this time, the control center determines that the leakage of the main pipe section C313 is small. At this time, the control center only shuts off the first solenoid valve 32 and the second solenoid valve 33 of the main pipe section C313, and then only opens the fourth standby solenoid valve 55 of the second standby pipe section A511, the fifth standby solenoid valve 56 of the second standby pipe section B512 and the third standby solenoid valve 53 of the second standby pipe section C513, so that the refrigerant flowing out of the refrigerant outlet of the condenser 1 flows through the main pipe section A311, the main pipe section B312, the second standby pipe section B512 and the main pipe section D314 in turn, and then flows to the refrigerant inlet of the evaporator 2.

[0112] 3. If the first pressure sensor 34 of the main pipe section C313 detects that the pressure P1 of the main pipe section C313 is 45kPa≤P1<50kPa, at this time, although the positive pressure explosion-proof system of the main pipe section C313 fails, the pressure P1≥45kPa, indicating that although the pressure P1 in the main pipe section C313 is negative pressure, the deviation does not exceed 5kPa. At this time, the control center still determines that the leakage of the main pipe section C313 is small. At this time, the control center controls the condenser 1 to increase the output of the refrigerant to increase the pressure P1 in the main pipe section C313. 1, and at the same time, the control center only closes the first solenoid valve 32 and the second solenoid valve 33 of the main pipe section C313, and then the control center only opens the fourth standby solenoid valve 55 of the second standby pipe section A511, the fifth standby solenoid valve 56 of the second standby pipe section B512 and the third standby solenoid valve 53 of the second standby pipe section C513, so that the refrigerant flowing out of the refrigerant outlet of the condenser 1 flows through the main pipe section A311, the main pipe section B312, the second standby pipe section B512 and the main pipe section D314 in sequence, and then flows to the refrigerant inlet of the evaporator 2.

[0113] It should be noted that the negative pressure mentioned in this article is relative to 50 kPa. As long as it is lower than 50 kPa, it is negative pressure, which applies throughout the article.

[0114] 4. If the first pressure sensor 34 of the main pipe section C313 detects that the pressure P1 of the main pipe section C313 is less than 45 kPa, the positive pressure explosion-proof system of the main pipe section C313 fails and the pressure P1 is less than 45 kPa. The control center determines that the leakage of the main pipe section C313 is large. The control center first turns off the main solenoid valve 35, shuts down the air conditioner, and then notifies the maintenance personnel to carry out timely maintenance to prevent flammable and explosive gases such as gas from leaking into the main pipe section 31 and flowing with the refrigerant. This can not only maintain the temperature of the refrigerant, reduce the refrigerant loss caused by pipeline leakage and the additional energy consumption required for the system to frequently compensate for the refrigerant, but also eliminate the safety hazards such as deflagration and explosion in the system, and ensure the life safety of surrounding personnel and the property safety of surrounding facilities.

[0115] Case 2: For any two consecutive main pipe sections 31, this embodiment takes the main pipe section B 312 and the main pipe section C 313 as examples for illustration.

[0116] 1. If the first pressure sensors 34 of the main pipe section B312 and the main pipe section C313 both detect that the pressure P2 of the main pipe section B312 and the main pipe section C313 is greater than 55 kPa, it means that the pressure P2 in the main pipe section B312 and the main pipe section C313 is normal, there is no failure problem of the positive pressure explosion-proof system of the main pipe section B312 and the main pipe section C313, and the air conditioner operates normally.

[0117] 2. If the first pressure sensors 34 of the main pipe section B312 and the main pipe section C313 both detect that the pressure P2 of the main pipe section B312 and the main pipe section C313 is 50kPa≤P2≤55kPa, at this time, although the positive pressure explosion-proof system of the main pipe section B312 and the main pipe section C313 fails, the pressure P2>50kPa, indicating that the pressure P2 in the main pipe section B312 and the main pipe section C313 is still positive pressure. At this time, the control center determines that the leakage of the main pipe section B312 and the main pipe section C313 is small, and the control center The control center only closes the first solenoid valve 32 and the second solenoid valve 33 of the main pipe section B312 and the main pipe section C313, and then only opens the third spare solenoid valve 53 of the second spare pipe section A511 and the second spare pipe section C513, and the fifth spare solenoid valve 56 of the second spare pipe section B512, so that the refrigerant flowing out of the refrigerant outlet of the condenser 1 flows through the main pipe section A311, the second spare pipe section A511, the second spare pipe section B512 and the main pipe section D314 in sequence, and then flows to the refrigerant inlet of the evaporator 2.

[0118] 3. If the first pressure sensors 34 of the main pipe section B312 and the main pipe section C313 both detect that the pressure P2 of the main pipe section B312 and the main pipe section C313 is 45kPa≤P2<50kPa, at this time, although the positive pressure explosion-proof system of the main pipe section B312 and the main pipe section C313 fails, the pressure P2≥45kPa, indicating that the pressure P2 in the main pipe section B312 and the main pipe section C313 is negative pressure, but the deviation does not exceed 5kPa. At this time, the control center still determines that the leakage of the main pipe section B312 and the main pipe section C313 is small, and the control center controls the condenser 1 to increase the output of the refrigerant. , to increase the pressure P2 in the main pipe section B312 and the main pipe section C313. At the same time, the control center only closes the first solenoid valve 32 and the second solenoid valve 33 of the main pipe section B312 and the main pipe section C313, and the control center then only opens the third standby solenoid valve 53 of the second standby pipe section A511 and the second standby pipe section C513, and the fifth standby solenoid valve 56 of the second standby pipe section B512, so that the refrigerant flowing out of the refrigerant outlet of the condenser 1 flows through the main pipe section A311, the second standby pipe section A511, the second standby pipe section B512 and the main pipe section D314 in sequence, and then flows to the refrigerant inlet of the evaporator 2.

[0119] 4. If the first pressure sensor 34 of the main section B312 and the main section C313 detects that the pressure P2 of the main section B312 and / or the main section C313 is less than 45 kPa, the positive pressure explosion-proof system of the main section B312 and / or the main section C313 fails, and the pressure P2 is less than 45 kPa. The control center determines that the leakage of the main section B312 and / or the main section C313 is large. The control center first turns off the main solenoid valve 35, then shuts down the air conditioner, and then notifies the maintenance personnel to carry out timely maintenance to prevent flammable and explosive gases such as gas from leaking into the main section 31 and flowing with the refrigerant. This can not only maintain the temperature of the refrigerant, reduce the refrigerant loss caused by pipeline leakage and the additional energy consumption required for the system to frequently compensate for the refrigerant, but also eliminate the safety hazards such as deflagration and explosion in the system, and ensure the life safety of surrounding personnel and the property safety of surrounding facilities.

[0120] Case 3: For at least two discontinuous main pipe sections 31 , this embodiment takes the main pipe section B 312 and the main pipe section D 314 as examples.

[0121] 1. If the first pressure sensors 34 of the main pipe section B312 and the main pipe section D314 both detect that the pressure P3 of the main pipe section B312 and the main pipe section D314 is greater than 55 kPa, it means that the pressure P3 in the main pipe section B312 and the main pipe section D314 is normal, there is no failure problem of the positive pressure explosion-proof system of the main pipe section B312 and the main pipe section D314, and the air conditioner operates normally.

[0122] 2. If the first pressure sensors 34 of the main pipe section B312 and the main pipe section D314 both detect that the pressure P3 of the main pipe section B312 and the main pipe section D314 is 50kPa≤P3≤55kPa, at this time, although the positive pressure explosion-proof system of the main pipe section B312 and the main pipe section D314 fails, the pressure P3>50kPa, indicating that the pressure P3 in the main pipe section B312 and the main pipe section D314 is still positive pressure. At this time, the control center determines that the leakage of the main pipe section B312 and the main pipe section D314 is small, and the control center only closes the main pipe section B312 and the main pipe section D314. The first solenoid valve 32 and the second solenoid valve 33 of the main pipe section B312 and the main pipe section D314 are cut off, and the control center then only opens the third spare solenoid valve 53 of the second spare pipe section A511, the second spare pipe section B512 and the second spare pipe section C513, and the fifth spare solenoid valve 56 of the second spare pipe section C513, so that the refrigerant flowing out of the refrigerant outlet of the condenser 1 flows through the main pipe section A311, the second spare pipe section A511, the main pipe section C313 and the second spare pipe section C513 in sequence, and then flows to the refrigerant inlet of the evaporator 2.

[0123] 3. If the first pressure sensors 34 of the main pipe section B312 and the main pipe section D314 both detect that the pressure P3 of the main pipe section B312 and the main pipe section D314 is 45kPa≤P3<50kPa, at this time, although the positive pressure explosion-proof system of the main pipe section B312 and the main pipe section D314 fails, the pressure P3≥45kPa, indicating that the pressure P3 in the main pipe section B312 and the main pipe section D314 is negative pressure but the deviation does not exceed 5kPa. At this time, the control center still determines that the leakage of the main pipe section B312 and the main pipe section D314 is small. At this time, the control center controls the condenser 1 to increase the output of the refrigerant to increase the main The pressure in the pipe section B312 and the main pipe section D314 is P3, and at the same time, the control center only closes the first solenoid valve 32 and the second solenoid valve 33 of the main pipe section B312 and the main pipe section D314, and then the control center only opens the third spare solenoid valve 53 of the second spare pipe section A511, the second spare pipe section B512 and the second spare pipe section C513, and the fifth spare solenoid valve 56 of the second spare pipe section C513, so that the refrigerant flowing out of the refrigerant outlet of the condenser 1 flows through the main pipe section A311, the second spare pipe section A511, the main pipe section C313 and the second spare pipe section C513 in sequence, and then flows to the refrigerant inlet of the evaporator 2.

[0124] 4. If the first pressure sensor 34 of the main section B312 and the main section D314 detects that the pressure P3 of the main section B312 and / or the main section D314 is less than 45 kPa, the positive pressure explosion-proof system of the main section B312 and / or the main section D314 fails, and the pressure P3 is less than 45 kPa. The control center determines that the leakage of the main section B312 and / or the main section D314 is large. The control center first turns off the main solenoid valve 35, then shuts down the air conditioner, and then notifies the maintenance personnel to carry out timely maintenance to prevent flammable and explosive gases such as gas from leaking into the main section 31 and flowing with the refrigerant. This can not only maintain the temperature of the refrigerant, reduce the refrigerant loss caused by pipeline leakage and the additional energy consumption required for the system to frequently compensate for the refrigerant, but also eliminate the safety hazards such as deflagration and explosion in the system, and ensure the life safety of surrounding personnel and the property safety of surrounding facilities.

[0125] Example 3

[0126] Refer to the attached Figure 5 The utility model also proposes a pipeline leakage detection and switching system, including a main pipe 3 located between the refrigerant outlet of the condenser 1 and the refrigerant inlet of the evaporator 2, the main pipe 3 is provided with four main pipe sections 31 connected in sequence along the refrigerant flow direction, a third solenoid valve 36 is provided at the beginning of each of the main pipe sections 31, and a fourth solenoid valve 37 is provided at the end of the main pipe section 31 closest to the refrigerant inlet of the evaporator 2, and a fourth pressure sensor 38 is also provided in each of the main pipe sections 31.

[0127] Each main pipe section 31 is independently configured with a third backup pipeline 6, and the end of each third backup pipeline 6 is connected to the refrigerant inlet of the evaporator 2; each third backup pipeline 6 is connected to the side of the corresponding third solenoid valve 36 facing the refrigerant countercurrent direction through a fourth connecting pipe 61, and a sixth backup solenoid valve 62 is provided on the fourth connecting pipe 61.

[0128] In this way, when any main pipe section 31 leaks, the control center will shut off the third solenoid valve 36 and the fourth solenoid valve 37 of the main pipe section 31 where the leak occurs, and then open the sixth standby solenoid valve 62 of the corresponding third standby pipeline 6, so that the refrigerant flows into the evaporator 2 through the corresponding third standby pipeline 6. At this time, the main pipe section 31 where the leak occurs and the main pipe section 31 along the refrigerant flow direction cannot be used. This prevents flammable and explosive gases such as gas from leaking into the main pipe section 31 and flowing with the refrigerant. This can not only maintain the temperature of the refrigerant, reduce the refrigerant loss caused by pipeline leakage and the additional energy consumption required for the system to frequently compensate for the refrigerant, but also eliminate the safety hazards such as deflagration and explosion in the system, and ensure the life safety of surrounding staff and the property safety of surrounding facilities.

[0129] Example 4

[0130] The utility model also provides an air conditioner, comprising the above-mentioned pipeline leakage detection and switching system.

[0131] Among them, the air conditioner proposed in this embodiment is used in dangerous gas environments such as mines, so a positive pressure explosion-proof system is provided in the air conditioner, and the pressure in the positive pressure explosion-proof system is greater than 55kPa to prevent flammable and explosive gases in dangerous gas environments such as mines from entering the air conditioner. In order to detect whether the pipeline in the positive pressure explosion-proof system leaks in real time, the utility model additionally sets a pipeline leakage detection and switching system in the positive pressure explosion-proof system, and detects the pressure in the main pipeline 3 through the pipeline leakage detection and switching system. If the pressure in the corresponding main pipe section 31 is detected to be [45kPa, 55kPa], the control center will determine that the main pipe section 31 leaks, and the first solenoid valve 32 and the second solenoid valve 33 of the corresponding main pipe section 31 will be turned off, and then the corresponding first spare pipe section 41 and / or the second spare pipe section 51 will be switched; if the pressure in the corresponding main pipe section 31 is detected to be less than 45kPa, the control center will directly stop the operation of the air conditioner, and restart the air conditioner after the maintenance personnel successfully repair it. In this way, the refrigerant no longer flows through the leaking main pipe section 31, but instead flows through the first spare pipe section 41 and / or the second spare pipe section 51 corresponding to the leaking main pipe section 31, and then flows back to the next main pipe section 31 connected in sequence along the refrigerant flow direction, so as to prevent flammable and explosive gases such as gas from leaking into the main pipe section 31 and flowing with the refrigerant. This not only maintains the temperature of the refrigerant, reduces the refrigerant loss caused by pipeline leakage and the additional energy consumption required for the system to frequently compensate for the refrigerant, improves the cooling effect of the air conditioner, but also eliminates safety hazards such as deflagration and explosion of the air conditioner, and ensures the life safety of the staff around the air conditioner and the property safety of the surrounding facilities.

[0132] Obviously, the embodiments described above are only some embodiments of the utility model, rather than all embodiments. The preferred embodiments of the utility model are given in the accompanying drawings, but they do not limit the patent scope of the utility model. The utility model can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to replace some of the technical features therein with equivalents. Any equivalent structure made using the contents of the utility model specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the utility model.

Claims

1. A pipeline leakage detection and switching system, comprising a main pipeline (3) connected between an air-conditioning condenser (1) and an evaporator (2), characterized in that: The main pipe (3) is provided with a plurality of main pipe sections (31) connected in sequence along the flow direction of the refrigerant, the beginning and the end of each main pipe section (31) are respectively provided with a first solenoid valve (32) and a second solenoid valve (33), and each main pipe section (31) is also provided with a first pressure sensor (34); The system further comprises a first spare pipeline (4), wherein the first spare pipeline (4) is provided with a plurality of first spare pipeline sections (41) corresponding to the main pipeline section (31), and the starting end of each first spare pipeline section (41) is connected to the first electromagnetic valve (32) of the corresponding main pipeline section (31) through a first connecting pipe (42) on the side facing the refrigerant counterflow direction; Each of the first connecting pipes (42) is provided with a first standby solenoid valve (43).

2. The pipeline leakage detection and switching system according to claim 1, characterized in that: The first spare pipe section (41) closest to the refrigerant outlet of the condenser (1) is the first spare pipe section at the start, and the start ends of the remaining first spare pipe sections (41) except the first spare pipe section at the start are all provided with a second spare solenoid valve (44).

3. The pipeline leakage detection and switching system according to claim 1, characterized in that: A second pressure sensor (45) is provided in each of the first spare pipe sections (41).

4. The pipeline leakage detection and switching system according to claim 1, characterized in that: The system further comprises a second spare pipeline (5), each of the second spare pipelines (5) being provided with at least one second spare pipeline section (51) corresponding to the main pipeline section (31), and the starting end of each second spare pipeline section (51) being connected to a side of the second solenoid valve (33) of the corresponding main pipeline section (31) towards the flow direction of the refrigerant through a second connecting pipe (52); Each of the second connecting pipes (52) is provided with a third standby solenoid valve (53).

5. The pipeline leakage detection and switching system according to claim 4, characterized in that: The second spare pipe section (51) closest to the refrigerant input port of the evaporator (2) is the terminal second spare pipe section; The remaining second spare pipe sections (51) except the terminal second spare pipe section are also connected to the side of the second solenoid valve (33) of the corresponding main pipe section (31) facing the refrigerant counterflow direction through a third connecting pipe (54); Each of the third connecting pipes (54) is provided with a fourth standby solenoid valve (55).

6. The pipeline leakage detection and switching system according to claim 4, characterized in that: The second spare pipe section (51) closest to the refrigerant outlet of the condenser (1) is the starting second spare pipe section, and the starting ends of the remaining second spare pipe sections (51) except the starting second spare pipe section are all provided with a fifth spare solenoid valve (56).

7. The pipeline leakage detection and switching system according to claim 4, characterized in that: A third pressure sensor (57) is provided in each of the second spare pipe sections (51).

8. The pipeline leakage detection and switching system according to claim 1, characterized in that: Each of the main pipe sections (31) is also provided with at least one of a gas detection sensor, a hydrogen detection sensor, a carbon monoxide detection sensor and an acetylene detection sensor.

9. The pipeline leakage detection and switching system according to claim 1, characterized in that: A main electromagnetic valve (35) is provided between the refrigerant outlet of the condenser (1) and the main pipeline (3).

10. An air conditioner, characterized in that: A pipeline leakage detection and switching system comprising the pipeline leakage detection and switching system according to any one of claims 1 to 9.

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