[0026] Hereinafter, the embodiments of the present invention will be described with reference to the accompanying drawings and specific embodiments.
[0027] First refer to figure 2 , Which shows the specific implementation steps of the air conditioner refrigerant pouring method according to the present invention, in figure 1 In the method shown, the standard amount of refrigerant is poured into the outdoor unit of the air conditioner in two filling steps, and the method of infusing the refrigerant includes:
[0028] a) Vacuum the outdoor unit for subsequent refrigerant injection;
[0029] b) In the first refrigerant pouring step (pre-filling step), a predetermined amount of refrigerant (the method for determining the predetermined amount will be described later) is poured into the outdoor unit;
[0030] c) Connect the outdoor unit filled with a predetermined amount of refrigerant to the test circuit for performance testing;
[0031] d) Use the indoor unit of the air conditioner with the corresponding cooling capacity to test the performance of the outdoor unit filled with a predetermined amount of refrigerant (the method of determining the indoor unit with the corresponding cooling capacity used for the test will be described later);
[0032] e) In the second refrigerant pouring step (subsequent pouring), the remaining amount of refrigerant is poured into the outdoor unit, where the sum of the remaining amount of refrigerant and the predetermined amount of refrigerant is equal to the standard amount of refrigerant required by the outdoor unit.
[0033] Those skilled in the art should understand that although the standard amount of refrigerant is poured into the outdoor unit of the air conditioner in two successively in the above embodiment, according to the present invention, the pre-filling step may include more than one filling step, as long as the The pre-fill step is set before the test step, and it is sufficient to ensure that the refrigerant filled in the outdoor unit reaches a predetermined amount. Similarly, the subsequent perfusion step may also include more than one perfusion step. The specific selection and division of the pre-perfusion step and the subsequent perfusion step can be determined according to actual production needs.
[0034] Further, according to the present invention, the amount of refrigerant poured in the first refrigerant pouring step (ie, the predetermined amount) must be determined through experiments, that is, for a certain model of outdoor unit, first select a prototype for testing to determine The amount of refrigerant that needs to be poured in the pre-filling step. After the amount of refrigerant to be poured (predetermined amount) is determined, the determined amount of refrigerant can be used in this model of outdoor unit. The specific determination method is as follows. Install the upper sight glass (compressor body liquid level monitoring device) on the compressor of the outdoor unit. During the first refrigerant filling process, a certain amount of refrigerant is poured into the outdoor unit. After the first filling is completed, respectively Observe the liquid level in the compressor at multiple time points such as 1 hour, 2 hours, 4 hours, 7 hours...48 hours (that is, observe whether the refrigerant reaches a steady state), and observe the liquid level set on the compressor The mirror is performed to observe whether the refrigerant filled in the outdoor unit has entered the compression chamber of the compressor.
[0035] If during the observation time, the refrigerant injected in the outdoor unit is in a stable state and has not entered the compression chamber, the amount of refrigerant injected at this time is the predetermined amount of refrigerant required for the first injection; if within the observation time, the outdoor unit The injected refrigerant has not reached a stable state, and the observation time needs to be extended until the refrigerant reaches a stable state. If the refrigerant does not enter the compression chamber at this time, the amount of refrigerant to be injected can be determined. In contrast, if the refrigerant is found to have entered the compression chamber during observation, the amount of the first injected refrigerant needs to be reduced to meet the above requirements.
[0036] In addition, the amount of refrigerant injected in the first infusion step cannot be too small. If the amount of refrigerant injected is too small (for example, much less than the required standard refrigerant injection amount), the subsequent test process cannot be performed normally. Therefore, it is necessary to determine the lower limit value for the first amount of refrigerant perfusion (predetermined amount). This lower limit value is a value that ensures that the subsequent test steps can be carried out normally. The specific value of the lower limit value can be determined through test experiments, and Different models, the lower limit may be different.
[0037] After the first refrigerant injection is completed, the outdoor unit contains a certain amount of refrigerant, which basically exists in gaseous form, or only contains a small part of liquid refrigerant (the amount of this part of liquid refrigerant is less than the rest of the gas in the outdoor unit The amount of refrigerant), and these refrigerants can form a positive pressure in the entire closed outdoor unit system, which can reduce the impact on the compressor in the subsequent test steps and prevent the liquid refrigerant from entering the compression chamber of the compressor during the second filling. Inside.
[0038] according to figure 2 As shown in the air conditioner refrigerant pouring method of the present invention, in step (d), an air conditioner indoor unit with a corresponding cooling capacity is used to test the performance of an outdoor unit filled with a predetermined amount of refrigerant. The above-mentioned "corresponding cooling capacity" is based on It is determined by the cooling capacity that can be achieved by the amount of refrigerant poured in a refrigerant filling step. In this way, for outdoor units with different marked refrigerant filling quantities and different cooling capacities, by adjusting the refrigerant filling quantity in the first refrigerant filling step (that is, the aforementioned predetermined quantity), indoor units with the same cooling capacity (total amount) can be used. The unit tests outdoor units with different standard quantities of refrigerants. That is, if different outdoor units have the same cooling capacity after the first refrigerant filling is completed, it is possible to use indoor units with the same total cooling capacity to test different outdoor units. However, if the refrigerant is poured at one time, different outdoor units with large differences in cooling capacity cannot be tested with indoor units with the same total cooling capacity.
[0039] In fact, for a certain model of outdoor unit, the specific selection of the indoor unit with the corresponding cooling capacity is determined through experiments, that is, after the first filling is completed, the cooling capacity that can be achieved according to the first filling of refrigerant It is possible to use several indoor units with similar cooling capacity to test it, but which model to choose needs to be considered in combination with another model of outdoor unit. That is, if it is found through experiments that after the first perfusion is completed, the Type A outdoor unit can be tested with three indoor units with a total cooling capacity of 40kw, 45kw, and 50kw, while the Type B outdoor unit can be tested with a total cooling capacity of 50kw, Three indoor units of 55kw and 60kw are tested. After comprehensive consideration, an indoor unit with a cooling capacity of 50kw can be selected to test these two different outdoor units, thereby reducing the types of indoor units required for testing. In the case where the refrigerant is poured at one time, the two different types of outdoor units may not be able to find the overlap point of the total cooling capacity of the indoor unit for testing.
[0040] In this way, for outdoor units with different cooling capacities (different standard refrigerant quantities), by adjusting the first refrigerant filling quantity, the indoor units with the same cooling capacity can be used for docking tests, which greatly improves the test versatility of the indoor units and reduces The number of docking indoor units required is saved, resources and production line space are saved, and the labor intensity of operators is reduced. Specifically, for example, according to the prior art method, an outdoor unit with a cooling capacity of 90kw needs to match an indoor unit with a cooling capacity of 90kw or multiple indoor units with a total cooling capacity of 90kw (for example, 6 indoor units with a cooling capacity of 60kw). Use an indoor unit with a cooling capacity of 60kw or multiple indoor units with a total cooling capacity of 60kw (for example, 5 indoor units with 12kw) for matching tests. If the outdoor unit models (cooling capacity) are different, the test is required The indoor unit is different; according to the method of the present invention, if the compressor of the outdoor unit is filled with refrigerant with a cooling capacity of 20kw for the first time, the indoor unit of 20kw or the indoor unit with a total cooling capacity of 20kw can be used. Docking test. For different outdoor units, as long as the cooling capacity that can be achieved after the first filling is made the same (for example, both are 20kw), the same indoor unit with a cooling capacity of 20kw or the total cooling capacity can be used as 20kw The indoor unit is tested.
[0041] The above technical effects of the present invention will be described below with reference to FIGS. 3 and 4 in conjunction with specific examples. As shown in the figure, in the prior art method, when testing an outdoor unit with a cooling capacity of 90kw, 8 indoor units with a cooling capacity of 12kw need to be used for docking tests; while the method according to the present invention is After the outdoor unit is filled with a predetermined amount of refrigerant, it can be tested with three 12kw indoor units. When the type of the outdoor unit changes (that is, the standard refrigerant filling amount is different), according to the method of the prior art, the outdoor unit with a cooling capacity of 45kw needs to use 4 indoor units with a cooling capacity of 12kw for the docking test; and according to the present invention In the method, after a predetermined amount of refrigerant is injected (the refrigerant injected at this time makes the 45kw outdoor unit have the same cooling capacity as the 90kw outdoor unit after the first injection, but the injection volume here is the same as the 90kw unit The type is different, the specific perfusion volume is determined by experiment), you can use the same three 12kw indoor units for testing. It can be clearly seen from the above description that the use of the refrigerant pouring method of the present invention to inject refrigerant in stages can use indoor units with the same total cooling capacity to test different models of outdoor units, and at the same time reduce the required indoor unit Quantity.
[0042] It should be noted that, according to the method of the present invention, the amount of refrigerant in the outdoor unit during the test is lower than the standard refrigerant injection rate. In the test, an indoor unit with a lower amount of refrigerant than the standard outdoor unit is used for testing. After the test is completed, the amount required for the air conditioner will be Standard refrigerant infusion is used for secondary infusion. For example: an outdoor unit with a cooling capacity of 90kw has a standard filling volume of 45kg. The experiment has determined that the optimal filling volume is 18kg. Then, when filling it with 18kg of refrigerant, use the 36kw indoor unit (which can reach 36kw at this time). After the test, the remaining 27kg of refrigerant is injected; and the standard refrigerant injection volume of a 60kw outdoor unit is 36kg. The first injection of 15kg refrigerant, then the 36kw indoor unit can also be used. It can also reach a cooling capacity of 36kw) for testing, and then refill the remaining 21kg of refrigerant after the test is completed.
[0043] In this method, the two refrigerant infusions of the outdoor unit are carried out in two stations respectively, the first refrigerant infusion step is carried out in the first station A, and the second refrigerant infusion step is carried out in the second station B. A station A and a second station B are respectively arranged before and after the test station.
[0044] It should be noted that the refrigerant pouring method for an air conditioner according to the present invention is not limited to the above specific examples. In fact, according to actual needs, the refrigerant pouring can be performed in multiple steps (ie, two or more pouring steps). carry out. Each filling step is carried out in a different station. The test step of the compressor can be set after the first filling is completed. The total amount of refrigerant poured in each filling step is equal to the standard refrigerant volume of the outdoor unit. Similar to the above-mentioned embodiment, when the outdoor unit is tested, the refrigerant contained in the outdoor unit exists in gaseous form or only contains a part of liquid refrigerant, wherein the amount of this part of the liquid refrigerant is less than the amount of gaseous refrigerant in the remaining part of the outdoor unit ; And, in the case that the standard amount of refrigerant of the outdoor unit is different, as long as the refrigerant poured into the outdoor unit before the test step allows different outdoor units to have the same cooling capacity (the pre-filled amount of the refrigerant is different for different models) , You can use indoor units with the same cooling capacity to test outdoor units with different refrigerant standard quantities.
[0045] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
