CN101782303B - Refrigerant filling method for air conditioner - Google Patents

Abstract

The invention provides an air conditioner refrigerant filling method, wherein, the standard amount of refrigerant is poured into the outdoor unit of the air conditioner successively in more than two filling steps, and the outdoor unit is filled with a predetermined amount of refrigerant in the outdoor unit. machine for testing. The filling step includes a prefilling step and a subsequent filling step. After the refrigerant injected in the prefilling step is balanced in the outdoor unit, the refrigerant injected in the outdoor unit does not enter the compression chamber of the compressor. Further, after prefilling, the refrigerant in the outdoor unit exists in gaseous state or only contains a part of liquid refrigerant, wherein the amount of liquid refrigerant is smaller than that of gaseous refrigerant.

Description

Air Conditioner Refrigerant Filling Method

technical field

The invention relates to the field of air conditioners, in particular to a method for pouring refrigerant into an air conditioner.

Background technique

In the process of producing air conditioners, especially after injecting refrigerant into the outdoor units of the air conditioner (especially digital machines and frequency conversion units), it is necessary to test the working performance of the outdoor units filled with refrigerant (indoor units with corresponding cooling capacity) machine for testing). In the production process of existing commercial large-scale air conditioners (which require a large amount of refrigerant, which is larger than that of ordinary household air conditioners), the refrigerant injection of the outdoor unit is completed at one time, that is, the standard refrigerant injection for a certain model The amount is poured into the corresponding outdoor unit at one time, and then the performance of the outdoor unit filled with refrigerant is tested (the steps of filling and testing are shown in Figure 1). However, the required standard amount of refrigerant is all poured into the outdoor unit at one time. Due to the large amount of refrigerant injected, most of them exist in liquid form after being poured into the compressor of the outdoor unit. When the machine is running, the so-called "liquid hammer" phenomenon will occur in the compressor, that is, it will cause an impact on the compressor. This method of filling the refrigerant at one time and then performing a performance test will cause an impact on the compressor during the test, thereby reducing the service life of the compressor.

Contents of the invention

The object of the present invention is to provide an improved air conditioner refrigerant filling method, which can overcome the above-mentioned problems in the prior art.

In view of the above purpose, according to the present invention, there is provided an air conditioner refrigerant filling method, wherein, the standard amount of refrigerant is poured into the outdoor unit of the air conditioner successively in more than two filling steps, and a predetermined amount of refrigerant is poured into the outdoor unit Test the outdoor unit after using the refrigerant.

Preferably, according to the air conditioner refrigerant filling method of the present invention, wherein, the refrigerant filling method includes:

a) Vacuum the outdoor unit;

b) filling a predetermined amount of refrigerant into the outdoor unit in the prefilling step;

c) Connect the outdoor unit filled with a predetermined amount of refrigerant to the test circuit;

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;

e) pouring the remaining amount of refrigerant into the outdoor unit in the subsequent pouring step, wherein the sum of the remaining amount of refrigerant and the predetermined amount of refrigerant is equal to the standard amount of refrigerant.

Preferably, according to the air conditioner refrigerant filling method of the present invention, after the pre-filling step, the refrigerant in the outdoor unit exists in the form of gas or only contains a part of liquid refrigerant, wherein the amount of liquid refrigerant is less than that of gas refrigerant quantity.

Preferably, according to the air conditioner refrigerant injection method of the present invention, after the refrigerant injected in the pre-filling step reaches equilibrium in the outdoor unit, the refrigerant existing in the outdoor unit does not enter the compressor of the outdoor unit.

Preferably, according to the air conditioner refrigerant charging method of the present invention, a liquid level monitoring device is installed on the compressor of the outdoor unit to monitor whether the refrigerant injected in the pre-filling step enters the compression chamber.

Preferably, according to the air conditioner refrigerant filling method of the present invention, the body liquid level monitoring device is a sight glass.

Preferably, according to the air conditioner refrigerant filling method of the present invention, the cooling capacity of the corresponding indoor unit used for testing is smaller than the cooling capacity of the outdoor unit of the air conditioner.

Preferably, according to the air conditioner refrigerant filling method of the present invention, in step (d), for the air conditioner outdoor units with different refrigerant standard amounts, adjust the amount of refrigerant injected in the pre-filling step, so as to use the same cooling capacity The indoor unit is tested against the outdoor unit with different refrigerant standard quantities.

Preferably, according to the air conditioner refrigerant filling method of the present invention, the refrigerant filling of the outdoor unit is performed at different stations, the pre-refrigerant filling step is performed at the first station (A), and the subsequent refrigerant filling step is performed at the second station (A). It is carried out on station (B), and the test station is set between the first station and the second station.

The present invention has the following technical effects:

According to the air conditioner refrigerant filling method of the present invention, the standard filling amount of refrigerant is divided into two fillings. After the first filling is completed, the refrigerant in the outdoor unit exists in a gaseous state (or only a small amount of liquid refrigerant exists). The impact of liquid refrigerant into the compressor is avoided, and the "liquid shock" phenomenon will not occur when the compressor is tested at this time; in addition, since the amount of refrigerant injected for the first time can be adjusted, indoor units with the same cooling capacity can be used to pair Air-conditioning outdoor units with different refrigerating capacities (that is, required standard refrigerant filling amounts are different) are tested, and the number of indoor units required for testing can be reduced.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory in nature, and are intended to provide further explanation of the invention as claimed.

Description of drawings

The accompanying drawings constitute a part of this specification and are provided to help further understanding of the invention. The drawings illustrate some embodiments of the invention and together with the description serve to explain the principles of the invention. The same components are denoted by the same reference numerals in the drawings. In the attached picture:

FIG. 1 is a schematic diagram of the refrigerant filling process of an outdoor unit of an air conditioner according to the prior art;

Fig. 2 is a schematic diagram of the refrigerant filling process of the outdoor unit of the air conditioner according to the present invention;

3a and 3b are schematic diagrams of the test matching relationship between the indoor unit and the outdoor unit in the test steps of the outdoor unit refrigerant of the air conditioner according to the prior art; and

Fig. 4a, 4b are corresponding to Fig. 3a, 3b, in the test step of the refrigerant of the outdoor unit of the air conditioner according to the present invention, the schematic diagrams of the test matching relationship between the indoor unit and the outdoor unit.

Detailed ways

Embodiments of the present invention will be described below with reference to the accompanying drawings and in combination with specific embodiments.

First with reference to Fig. 2, wherein have shown the specific implementation steps of the air conditioner refrigerant filling method according to the present invention, in the method shown in Fig. 1, the refrigerant of standard amount is poured into the outdoor of air conditioner respectively in two filling steps Inside the machine, the refrigerant filling method includes:

a) Vacuumize the outdoor unit for subsequent refrigerant filling;

b) In the first refrigerant filling step (pre-filling step), pouring a predetermined amount of refrigerant (the method for determining the predetermined amount will be described later) into the outdoor unit;

c) Connect the outdoor unit filled with a predetermined amount of refrigerant to the test circuit for performance testing;

d) Using 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);

e) In the second refrigerant filling step (subsequent filling), the remaining amount of refrigerant is poured into the outdoor unit, wherein 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.

Those skilled in the art should understand that although in the above-mentioned embodiment, the standard amount of refrigerant is poured into the outdoor unit of the air conditioner in two successive steps, according to the present invention, the prefilling step may include more than one filling step, as long as the The prefilling step is set before the test step, and it only needs to ensure that the refrigerant filled in the outdoor unit reaches a predetermined amount. Likewise, subsequent perfusion steps 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.

Further, according to the present invention, the amount of refrigerant poured in the above-mentioned first refrigerant pouring step (that is, the predetermined amount) should be determined through experiments, that is, for a certain type of outdoor unit, first select a prototype to conduct experiments to determine The amount of refrigerant that needs to be injected in the pre-filling step, after the amount of refrigerant to be injected (predetermined amount) is determined, the determined amount of refrigerant can be used for this type of outdoor unit, and the specific determination method is as follows. Install the upper sight glass (compressor 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 has reached a stable state), and observe the liquid level through the sight liquid installed on the compressor Mirror to observe whether the refrigerant poured into the outdoor unit has entered the compression chamber of the compressor.

If within the observation time, the refrigerant poured into the outdoor unit has been 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 If the refrigerant injected inside has not yet reached a stable state, it is necessary to extend the observation time 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. Relatively, if it is found that the refrigerant has entered the compression cavity during observation, the amount of refrigerant injected for the first time needs to be reduced to meet the above requirements.

In addition, the amount of refrigerant poured in the first filling step should not be too small. If the amount of refrigerant injected is too small (for example, much less than the required standard refrigerant filling amount), the subsequent testing process will not be able to be performed normally. Therefore, it is also necessary to determine the lower limit value for the first injected refrigerant amount (predetermined amount). This lower limit value is the 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 for The lower limit may be different for different models.

After the first refrigerant filling is completed, the outdoor unit contains a certain amount of refrigerant, which basically exists in the form of gas, or only contains a small part of liquid refrigerant (the amount of this part of liquid refrigerant is smaller than that of 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, thereby reducing the impact on the compressor in the subsequent test steps and preventing liquid refrigerant from entering the compression chamber of the compressor during secondary filling Inside.

According to the air conditioner refrigerant filling method of the present invention shown in Fig. 2, in step (d), the indoor unit of the air conditioner with the corresponding cooling capacity is used to test the performance of the outdoor unit filled with a predetermined amount of refrigerant, the above-mentioned "corresponding cooling capacity" It is determined according to the cooling capacity that can be achieved by the amount of refrigerant injected in the first refrigerant injection step. In this way, for outdoor units with different labeled refrigerant filling volumes and different cooling capacities, by adjusting the refrigerant filling volume (that is, the above-mentioned predetermined amount) in the first refrigerant filling step, indoor units with the same cooling capacity (total amount) can be used. Test the outdoor unit with different standard quantities of refrigerant. That is, if different outdoor units have the same refrigerating capacity after the first refrigerant filling, it is possible to use indoor units with the same refrigerating capacity to test different outdoor units. And if the refrigerant is injected once, it is impossible to test with the indoor units with the same cooling capacity for different outdoor units with large differences in cooling capacity.

In fact, for a certain type of outdoor unit, the specific selected indoor unit with corresponding cooling capacity is determined through experiments. If the capacity is large, several indoor units with similar cooling capacity may be used to test it, but which model to choose needs to be considered in combination with another type of outdoor unit. That is, if it is found through experiments that after the first filling is completed, the type A outdoor unit can be tested with three types of indoor units with total cooling capacity of 40kw, 45kw, and 50kw, while the type B outdoor unit can be tested with three types of indoor units with total cooling capacity of 50kw, Three indoor units of 55kw and 60kw are tested, and 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 that the refrigerant is injected once, the two different types of outdoor units may not be able to find the coincidence point of the cooling capacity of the indoor unit for testing.

In this way, for outdoor units with different refrigerating capacity (different refrigerant standard quantities), by adjusting the amount of refrigerant infusion for the first time, the indoor unit with the same refrigerating capacity can be used for docking test, which greatly improves the test versatility of the indoor unit and reduces The number of indoor units required for docking is reduced, resources and production line space are saved, and the labor intensity of operators is reduced. Specifically, for example, according to the method of the prior art, an outdoor unit with a refrigerating capacity of 90kw needs to be matched with a 90kw indoor unit or multiple indoor units with a total refrigerating capacity of 90kw (for example, six 15kw indoor units), 60kw Use an indoor unit with a refrigerating capacity of 60kw or multiple indoor units with a total refrigerating capacity of 60kw (for example, five 12kw indoor units) for a matching test. The indoor unit is different; according to the method of the present invention, if the compressor of the outdoor unit is filled with a refrigerant capable of reaching 20kw for the first time, then a 20kw indoor unit or an indoor unit with a total cooling capacity of 20kw can be used. For the docking test, for different outdoor units, as long as the cooling capacity that can be achieved after the first filling is the same (for example, both are 20kw), you can use the same indoor unit with a cooling capacity of 20kw or the total cooling capacity is 20kw indoor unit for testing.

The above-mentioned technical effects of the present invention will be described below with reference to FIG. 3 and FIG. 4 in conjunction with specific examples. As shown in the figure, in the method of the prior art, when testing an outdoor unit with a cooling capacity of 90kw, it is necessary to use 8 indoor units with a cooling capacity of 12kw for a docking test; and according to the method of the present invention, in the After filling the predetermined amount of refrigerant in the outdoor unit, you can use three 12kw indoor units for testing. When the type of the outdoor unit is changed (i.e., the standard refrigerant filling amount is different), according to the method of the prior art, an outdoor unit with a cooling capacity of 45kw needs to use 4 indoor units with a cooling capacity of 12kw for a docking test; and according to the present invention method, after pouring a predetermined amount of refrigerant (the refrigerant poured at this time makes the 45kw outdoor unit have the same cooling capacity as the 90kw outdoor unit after the first filling, but the filling amount here is the same as that of the 90kw outdoor unit. Different models, the specific perfusion volume is determined by experiments), you can use the same three 12kw indoor units for testing. It can be clearly seen from the above description that using the refrigerant injection method of the present invention to inject refrigerant in stages can use indoor units with the same cooling capacity to test different types of outdoor units, and at the same time reduce the number of required indoor units. quantity.

It should be noted that according to the method of the present invention, the amount of refrigerant in the outdoor unit is lower than the standard refrigerant filling amount during the test, and the indoor unit with a lower than the standard refrigerant amount of the outdoor unit is used for testing during the test. Standard refrigerant perfusion for secondary perfusion. For example: the standard filling volume of an outdoor unit with a cooling capacity of 90kw is 45kg, and the optimum filling volume determined by experiments is 18kg, then when filling, first fill in 18kg of refrigerant, and then use a 36kw indoor unit (which can reach 36kw at this time) refrigerating capacity) for a docking test, and then refill the remaining 27kg of refrigerant; while a 60kw outdoor unit has a standard refrigerant filling capacity of 36kg, the first time 15kg of refrigerant is poured, and then a 36kw indoor unit (other than that) can also be used It can also reach a cooling capacity of 36kw) to test, and then fill the remaining 21kg of refrigerant after the test is completed.

In this method, the two refrigerant injections of the outdoor unit are carried out at two stations respectively, the first refrigerant injection step is carried out at the first station A, the second refrigerant injection step is carried out at the second station B, and the second refrigerant injection step is carried out at the second station B. The first station A and the second station B are respectively arranged before and after the testing station.

It should be noted that the air conditioner refrigerant filling method according to the present invention is not limited to the above-mentioned specific examples. In fact, according to actual needs, the refrigerant filling can be performed in multiple steps (that is, more than two filling steps). Finish. Each filling step is carried out at different stations, and the test step of the compressor can be set after the first filling is completed. The sum of the amount of refrigerant injected in each filling step is equal to the standard refrigerant amount of the outdoor unit. Similar to the above-mentioned embodiments, when the outdoor unit is tested, the refrigerant contained in the outdoor exists in the form of gas or only contains a part of the liquid refrigerant, wherein the amount of this part of the liquid refrigerant is smaller than the remaining part of the gas refrigerant in the outdoor unit. ; And, in the case of different standard amounts of refrigerant in the outdoor unit, as long as the refrigerant injected into the outdoor unit before the test step makes different outdoor units have the same cooling capacity (the pre-filling amount of refrigerant for different models is different) , the indoor unit with the same cooling capacity can be used to test the outdoor unit with different refrigerant standard quantities.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (9)

1. An air conditioner refrigerant perfusion method, characterized in that the standard amount of refrigerant is poured into the outdoor unit of the air conditioner successively in more than two perfusion steps, and after the predetermined amount of refrigerant is perfused in the outdoor unit Test the outdoor unit. 2. The air conditioner refrigerant filling method according to claim 1, characterized in that the refrigerant filling method comprises: a) vacuumize the inside of the outdoor unit; b) pouring a predetermined amount of refrigerant into the outdoor unit in the prefilling step; c) connecting the outdoor unit filled with the predetermined amount of refrigerant to the test circuit; d) using the indoor unit of the air conditioner with corresponding cooling capacity to test the performance of the outdoor unit filled with the predetermined amount of refrigerant; e) pouring the remaining amount of refrigerant into the outdoor unit in the subsequent pouring step, wherein the sum of the remaining amount of refrigerant and the predetermined amount of refrigerant is equal to the standard amount of refrigerant. 3. The refrigerant filling method for an air conditioner according to claim 2, characterized in that, after the pre-filling step, the refrigerant in the outdoor unit exists in a gaseous state or only contains a part of liquid refrigerant, wherein, The amount of the liquid refrigerant is smaller than the amount of the gas refrigerant. 4. The air conditioner refrigerant injection method according to claim 3, characterized in that, after the refrigerant injected in the pre-filling step reaches equilibrium in the outdoor unit, the liquid refrigerant in the outdoor unit does not enter the inside the compressor of the outdoor unit. 5. The air conditioner refrigerant injection method according to claim 4, characterized in that a liquid level monitoring device is installed on the compressor of the outdoor unit to monitor whether the refrigerant injected in the pre-filling step enters the compression chamber . 6 . The air conditioner refrigerant filling method according to claim 5 , wherein the liquid level monitoring device is a sight glass. 7 . 7. The method for injecting refrigerant into an air conditioner according to claim 2, wherein the cooling capacity of the indoor unit of the air conditioner corresponding to the cooling capacity used for testing is smaller than the cooling capacity of the outdoor unit of the air conditioner. 8. The air conditioner refrigerant filling method according to claim 2, characterized in that, in the step (d), for the outdoor units of the air conditioner with different refrigerant standard quantities, the amount of the refrigerant poured in the pre-filling step is adjusted. amount, so that indoor units with the same cooling capacity are used to test outdoor units with different refrigerant standard amounts. 9. The air conditioner refrigerant filling method according to claim 2, characterized in that the refrigerant filling of the outdoor unit is carried out at different stations, and the pre-filling step is carried out at the first station (A), Said subsequent filling step is carried out at a second station (B), and a test station is arranged between said first station and said second station.

Images