JPH0742474U - Refrigerant amount measuring device in refrigeration cycle - Google Patents

Abstract

(57) [Summary] [Purpose] Measuring the amount of refrigerant without error caused by the operator,
When the measured amount of the refrigerant is not appropriate, the refrigerant is supplied and discharged during the measurement to optimize the amount of the refrigerant. [Structure] The refrigerant F is supplied into the cylinder 17 or the refrigerant F in the cylinder 17 is supplied to the cylinder 17 that contains the refrigerant F sent from the cycle S of the air conditioner.
7 is provided with a supply / discharge valve 33 that can be discharged to the outside. Therefore, when the measured total refrigerant amount is excessive or insufficient, the supply / discharge valve 33 is used to supply / discharge the refrigerant F. Adjust the amount of refrigerant to an appropriate amount. In addition to the second hose 25 for returning the refrigerant F into the cycle S, the cylinder 17 is connected with a third hose 31 for returning the oil O in the cylinder S into the cycle S of the air conditioner. Can also be returned to the cycle S.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a refrigerant amount measuring device in a refrigeration cycle capable of measuring the amount of refrigerant in a refrigeration cycle and adjusting the amount when there is an excess or deficiency.

[0002]

[Prior art]

 To check the amount of refrigerant in the refrigeration cycle of the air conditioner, that is, the air conditioning system, there is a method of visually checking the amount of refrigerant through the sight glass installed in the liquid tank of the air conditioning system. In this method, it is determined whether the amount of refrigerant is insufficient, the amount is appropriate, or is overfilled, depending on the liquid level position of the refrigerant in the liquid tank that is visually confirmed.

Further, when the refrigerant is charged using a so-called charging cylinder that is generally commercially available, as shown in FIG. 2, a high pressure hose 100 connected to the high pressure side of a refrigeration cycle (not shown). It is possible to confirm the amount of the refrigerant by measuring the weight of the refrigerant F sent from the cylinder 102 to the cylinder 102.

[0004]

[Problems to be solved by the device]

 However, in the visual confirmation method, the confirmation amount of the refrigerant may be different depending on the viewer, and the determination as to whether or not the refrigerant amount is appropriate may vary. Further, in the method of confirming the refrigerant amount using the charging cylinder 102, the compressor oil is stored in the charging cylinder 102 together with the refrigerant F, but the stored refrigerant F is returned to the cooling cycle in a vaporized state. Liquid oil is not returned to the cooling cycle. The charging cylinder 102 can confirm the amount of the refrigerant F, but if the confirmation reveals that there is an excess or deficiency of the refrigerant amount, the refrigerant amount is adjusted by extracting or filling the refrigerant F. Can not do it.

The present invention has been made in view of the above problems, and when the confirmed amount of refrigerant is excessive or insufficient, the amount of refrigerant can be adjusted to an appropriate amount and is sent into the cylinder together with the refrigerant. An object of the present invention is to provide a refrigerant amount measuring device in a refrigeration cycle, which can return oil to the refrigeration cycle again.

[0006]

[Means for Solving the Problems]

 The refrigerant amount measuring apparatus in the refrigeration cycle of the present invention for achieving the above object, comprises a first delivery means for delivering the refrigerant in the cooling cycle from the high pressure side of the cooling cycle to the cylinder, and the first delivery means for delivering the refrigerant. An on-off valve capable of preventing the delivery of the refrigerant, a second delivery means for returning the gaseous refrigerant in the cylinder into the refrigeration cycle, and a refrigerant delivered by the first delivery means in the cylinder. A third delivery means for returning the delivered oil to the inside of the refrigeration / freezing cycle, a total amount of the amount of refrigerant stored in the cylinder and the amount of residual refrigerant in the refrigeration cycle at the time of measuring the amount of stored refrigerant, and an appropriate amount. It is characterized by having a supply / discharge valve capable of discharging the stored refrigerant in the cylinder to the outside of the cylinder or supplying a new refrigerant into the cylinder in accordance with the difference with the refrigerant amount.

[0007]

[Action]

 When the refrigerant is sent from the refrigeration cycle to the cylinder by the first delivery means, the amount of refrigerant stored in the cylinder is measured. If the sum of the amount of stored refrigerant measured in this way and the amount of residual refrigerant remaining in the refrigeration cycle is more or less than the proper amount of refrigerant, excess refrigerant is removed via the supply / discharge valve. Discharge it to the outside of the cylinder, or supply refrigerant to the cylinder in an insufficient amount. After that, the first valve is closed to stop the refrigerant from flowing into the cylinder, and the gaseous refrigerant in the cylinder is returned to the cycle of the air conditioner via the second delivery means. The oil in the cylinder is returned to the inside of the cooling cycle through the third delivery means together with the gaseous refrigerant.

[0008]

【Example】

 Next, an embodiment of a refrigerant amount measuring device in a cooling cycle according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a refrigerant amount measuring device in a cooling cycle according to this embodiment. As shown in the drawing, the refrigerant amount measuring device 1 of the embodiment has a first hose connected to a high pressure side SH of a cooling cycle S of an air conditioner 2 via a first valve (open / close valve) 11 which can be opened and closed. It has (first delivery means) 13. The other end of the first hose 13 is connected to a cylinder 17 via a second valve 15 that can be opened and closed, and the cylinder 17 is connected to the refrigerant F from the high pressure side SH of the cooling cycle S via the first hose 13. Is sent. The cylinder 17 has a sight glass 19 made of a transparent material such as glass that allows the liquid level position of the stored refrigerant F1 contained in the cylinder 17 to be visually observed. The sight glass 19 corresponds to the liquid level position. A scale 21 indicating the weight of the refrigerant is added. Therefore, the weight of the stored refrigerant F1 contained in the cylinder 17 can be confirmed or measured by reading the numerical value of the scale 21 corresponding to the liquid surface position of the stored refrigerant F1. Of course, the entire cylinder 17 may be made of a transparent material.

A second hose (second delivery means) 25 is connected to the upper portion of the cylinder 17 via a third valve 23 that can be opened and closed. The other end of the second hose 25 is connected to the low pressure side SL of the cooling cycle S via the fourth valve 27, and the gaseous refrigerant FA in the cylinder 17 is cooled via the second hose 25. It is sent to the low-pressure side SL of cycle S. Further, in the middle of the second hose 25, a third hose (third delivery means) 31 connected to the lower part of the cylinder 17 via a fifth valve 29 which can be opened and closed is connected. The third hose 31 is a pipe for returning the liquid compressor oil O fed into the cylinder 17 together with the stored refrigerant F1 into the cooling cycle S. Therefore, in the second hose 25, from the position where the third hose 31 is connected to the position where it is connected to the cooling cycle S, both the gaseous refrigerant FA and the liquid oil O are fed into the cooling cycle S. Commonly used as piping to return to.

Further, in the upper part of the cylinder 17, a supply / exhaust valve used for supplying the refrigerant F into the cylinder 17 and discharging gas or liquid such as the refrigerant F in the cylinder 17 to the outside of the cylinder 17. 33 is attached. Therefore, when the measured total amount of refrigerant is not an appropriate amount, the refrigerant F in the cylinder 17 is discharged from the supply / discharge valve 33, or new refrigerant F is supplied into the cylinder 17, thereby The amount of F can be adjusted to an appropriate amount.

In order to measure the amount of refrigerant enclosed in the cooling cycle S with the refrigerant amount measuring device 1 as described above, first, the supply / discharge valve is closed with the first valve 11 and the fourth valve 27 closed. The air in the cylinder 17 is extracted from 33, and the inside of the cylinder 17 is put into a so-called vacuum state. After this, the cooling cycle S of the air conditioner 2 is operated and the first to fourth valves 11, 15, 23, 27 are opened. In this way, the refrigerant F in the cooling cycle S is sent to the cylinder 17 via the first hose 13 connected to the high pressure side SH. When the liquid level position of the stored refrigerant F1 in the cylinder 17 becomes stable after a certain period of time, the scale 21 corresponding to the liquid level position of the stored refrigerant F1 stored in the cylinder 17 is read. Since the amount of stored refrigerant read from the liquid surface position of the stored refrigerant F1 includes the amount of oil O sent together with the refrigerant F, the amount of oil O stored in the bottom of the cylinder 17 is also read.

Here, the residual refrigerant amount F 2 remaining in the cooling cycle S of the air conditioner 2 during operation can be calculated based on the operating conditions. Therefore, by subtracting the amount of oil O from the sum of the amount of stored refrigerant and the amount of residual cooling medium, the total amount of refrigerant enclosed in the cooling cycle S can be obtained. As described above, when the refrigerant amount measuring device 1 of the present embodiment is used, the total amount of refrigerant can be measured as numerical data, so that a measurement error (individual difference) caused by a measurer does not occur.

As a result of obtaining the total amount of refrigerant, when the refrigerant F is insufficient, the refrigerant F is supplied from the supply / discharge valve 33 into the cylinder 17 while observing the scale 21 of the cylinder 17 to supplement the shortage. When the refrigerant F is overfilled, the supply / discharge valve 33 is opened while looking at the scale 21 of the cylinder 17 to discharge an excessive amount of the refrigerant FA to the outside of the cylinder 17.

When the total amount of refrigerant in the cooling cycle S is adjusted to an appropriate amount in this way, the stored refrigerant F1 in the cylinder 17 is returned to the cooling cycle S of the air conditioner 2. First, the first valve 11 is closed to stop the movement of the refrigerant F from the high pressure side SH of the cooling cycle S to the cylinder 17. In this way, the vaporized refrigerant FA is returned from the third valve 23 through the second hose 25 into the cooling cycle S, and the oil O 2 is returned through the fifth valve 29 through the second hose 25 in the cooling cycle S. Return to.

[0015]

[Effect of device]

 As described above, according to the present invention, the total amount of refrigerant enclosed in the cooling cycle can be confirmed as a numerical value. Moreover, since the total amount of refrigerant is measured as numerical data, the measured total amount of refrigerant does not include an error (individual difference) caused by the measurer.

[Brief description of drawings]

FIG. 1 is an external view showing a state in which a refrigerant amount measuring device for an air conditioner of an embodiment is connected to the air conditioner.

FIG. 2 is a side view showing a cylinder portion of a so-called charging cylinder which has been conventionally used.

[Explanation of symbols]

11 ... 1st valve (open / close valve), 13 ... 1st hose (1st delivery means), 15 ... 2nd valve,
17 ... cylinder, 19 ... sight glass,
23 ... 3rd valve, 25 ... 2nd hose (2nd delivery means), 27 ... 4th valve, 29 ... 5th valve,
31 ... Third hose (third delivery means),
33 ... Supply / discharge valve.

Claims (1)

[Scope of utility model registration request] 1. A first means for delivering a refrigerant in a cooling cycle (S) from a high pressure side of the cooling cycle (S) to a cylinder (17).
Delivery means (13) and the refrigerant by the first delivery means (13)
An on-off valve (33) that can prevent the delivery of (F) and the cylinder (1
The second delivery means (25) for returning the gaseous refrigerant (F) in 7) into the refrigeration cycle (S) and the refrigerant (F) delivered by the first delivery means (13) together with the cylinder. Third delivery means (31) for returning the oil (O) delivered into the (S) into the refrigeration cycle (S), the amount of stored refrigerant contained in the cylinder (17) and the amount of stored refrigerant According to the difference between the total amount of remaining refrigerant in the refrigeration cycle (S) and the appropriate amount of refrigerant, the stored refrigerant (F) in the cylinder (17) is discharged to the outside of the cylinder (17), or A refrigerant amount measuring device in a refrigeration cycle, comprising: a supply / discharge valve (33) capable of supplying a new refrigerant (F) into the cylinder (17).