JP3530592B2 - Freon gas recovery device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Freon gas recovery apparatus, and more particularly to a Freon gas recovery apparatus capable of filling recovered Freon gas into a device.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram showing an example of a conventional CFC gas recovery apparatus. In the figure, reference numeral 1 is a device connection operating valve that is a device connection valve for connecting to a recovery target device (not shown), and 2 is connected to the recovery target device via a device connection operating valve 1 and compresses CFC gas. A compressor 3 for connecting to the compressor 2, an oil separator for separating and removing the oil component in the freon gas, 4 for connecting to the oil separator 3, a condenser for cooling and liquefying the compressed freon gas, 5 Is a strainer connected to the condenser 4 via a maintenance operation valve 6 to remove impurities from the liquefied CFC. The maintenance operation valve 6 is for closing the gas circuit when the strainer is replaced. Reference numeral 7 is a liquefaction refining means having a compressor 2, an oil separator 3, a condenser 4, a strainer 5, and the like.

Reference numeral 8 denotes a container connecting operation valve 9 which is a container connecting valve.
A collection container 10 connected to the strainer 5 via the stor- er for storing the recovered CFCs, and a collecting container 10 connected in parallel with the liquefaction purification means 7 between the device-connecting operation valve 1 and the container-connecting operation valve 9. An electromagnetic valve, 11 is a measuring device for measuring the weight of CFCs in the recovery container 8, and 12 is a control device connected to the liquefaction refining means 7, the filling electromagnetic valve 10 and the measuring device 11.

Further, the control device 12 has an operation mode switching section 12a for switching the operation mode of the device between recovery and filling.
A recovery mode control unit 12b for controlling each device in the recovery mode, a recovery mode output unit 12c for outputting a signal from the recovery mode control unit 12b to each device, and a filling solenoid valve 10 in the filling mode. And a filling mode output section 12d for outputting a signal to the.

Next, the operation will be described. First, when the recovery mode is selected by the operation mode switching unit 12a,
The filling solenoid valve 10 is in the closed state, and each operation valve 1,
6 and 9 are operated in the open state. Each device of the liquefaction refining means 7 is controlled and operated by the recovery mode controller 12b. The chlorofluorocarbon taken in from the device connecting operation valve 1 is compressed, condensed and purified by the liquefaction refining means 7, and is recovered in the recovery container 8. At this time, the weight of CFCs in the collection container 8 is measured by the weighing device,
When it becomes impossible to fill the container, it is detected by the recovery mode control unit 12b, and the operation of the entire device is stopped. As a result, overfilling of the collection container 8 is prevented.

On the other hand, when the filling mode is selected by the operation mode switching section 12a, the operation valve 6 is operated in the closed state, the operation valves 1 and 9 are operated in the open state, and the filling solenoid valve 10 is operated in the filling mode output section. It is opened by the signal from 12d. In such a state, CFC gas is filled from the inside of the collection container 8 through the filling electromagnetic valve 10 and the operation valve 1 into the collection target device, that is, the filling target device.

[0007]

In the conventional CFC gas recovery apparatus configured as described above, when the CFC gas is charged into the recovery target device in the charging mode, the operator has to adjust the charging amount. Therefore, there is a problem that overfilling or underfilling occurs with respect to the filling amount determined for each device to be recovered. Also, after the end of the collection mode,
Although the recovered CFC gas remains in each of the devices and pipes that make up the liquefaction refining means 7, the residual CFC gas is unrefined and cannot be refilled into the recovered device, and is released into the atmosphere. There was also.

[0008] The present invention has been made as a problem of solving the above problems, and an object thereof is to obtain a Freon gas recovery apparatus capable of preventing the atmospheric discharge of residual Freon crude .

[0009]

A CFC gas recovery apparatus according to the present invention is connected to a recovery target device through a device connection valve, and a liquefaction purification unit for liquefying and refining CFC gas, and a container connection valve for this liquefaction purification unit. A recovery container connected through the device, a solenoid valve for filling connected between the equipment connection valve and the container connection valve in parallel with the liquefaction purification means, and the liquefaction purification means provided in the liquefaction purification means A pair of backflow prevention solenoid valves for confining the residual CFC gas in the liquefaction refining means, and a pair of backflow prevention solenoid valves and a charging solenoid valve connected to prevent a pair of backflows when the collected equipment is filled with CFC gas. And a control device for outputting a signal for closing the solenoid valve for use. Also, weigh the collection container.
The measuring device is further equipped with
Connected to the solenoid valve for filling and CFC gas to the recovery target equipment.
At the time of filling, the value measured by the weighing device is reduced from the beginning of filling.
Compare a small amount with the set value input according to the device to be collected
Close the solenoid valve for filling before the decrease exceeds the set value.
To output the signal.

[0010]

[0011]

According to the present invention, the pair of backflow preventing solenoid valves are automatically closed when the recovery target equipment is filled with the Freon gas to prevent the residual Freon gas in the liquefaction refining means from flowing back to the recovery target equipment.

[0012]

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing a CFC gas recovery apparatus according to an embodiment of the present invention. The same or corresponding portions as those in FIG. 3 are designated by the same reference numerals and the description thereof will be omitted.

In the figure, 21 is a first backflow preventing solenoid valve provided between the device connecting operation valve 1 and the compressor 2, and 22 is provided between the condenser 4 and the strainer 5. This is a second backflow preventing solenoid valve, and this backflow preventing solenoid valve 22 also serves as a valve for maintenance of the strainer 5. Further, 8a and 8b are a liquid phase valve and a gas phase valve which are attached to the recovery container 8, respectively.

A control device 23 is connected to the liquefaction refining means 7, the measuring device 11, the filling solenoid valve 10 and the like,
The control device 23 includes an operation mode setting / switching unit 23a for switching the operation mode of the device between recovery and filling and inputting a set value at the time of filling, and a recovery mode control for controlling each device in the recovery mode. 23b, a filling mode control unit 23c that controls each device in the filling mode, and a weighing value display unit 23d that displays a weighing value by the weighing device 11.
And a control output unit 23e that outputs a control signal to each device in each mode.

Next, the operation will be described. 2 is shown in FIG.
3 is a flowchart for explaining the operation of the apparatus of FIG.
First, when the recovery mode is selected by the operation mode setting / switching unit 23a (step S1), the conditions for enabling the operation are prepared such that the operation valves 1 and 9 are operated in the open state. When the operable condition is satisfied in this way (step S2), the solenoid valves 10 for filling are kept closed and the solenoid valves 21, 22 for backflow prevention are opened (step S3). Thereafter, the CFC recovery operation is performed in the same manner as in the conventional example (step S4), and the recovery mode control unit 2
When it is confirmed by 3b that the recovery end condition is satisfied (step S5), the solenoid valves 10, 21, 22 are closed and the recovery operation ends (step S6).

On the other hand, when the filling mode is selected by the operation mode setting / switching unit 23a (step S1), the required filling amount according to the recovered equipment, that is, the filling equipment is set in the operation mode setting / switching unit 23a. It is input as M1) (step S7). Next, the filling mode control unit 23c stores the weighing value of the weighing device 11 at the start of filling as the initial weighing value (M2). In this way, M
After 1 and M2 are stored in the memory, the backflow preventing solenoid valves 21 and 22 are kept closed and the filling solenoid valve 10 is opened (step S8). In such a state, CFC gas is filled from the inside of the collection container 8 through the filling electromagnetic valve 10 and the operation valve 1 into the collection target device.

At this time, in the filling mode control section 23c,
The weighing value (M3) by the weighing device 11 is detected at regular time intervals, the amount of decrease (M2-M3) from the initial weighing value (M2) is obtained, and it is determined whether or not the condition of M2-M3 ≧ M1 is satisfied. (Step S9). When the above condition is satisfied, that is, when the amount of reduced CFC gas in the recovery container 8 becomes equal to or more than the required filling amount, the filling solenoid valve 10 is immediately closed,
The filling operation ends (step S10).

In the CFC gas recovery apparatus as described above, the required amount of CFC gas to be recovered is input to the control unit 23 as a set value, and the decrease amount of CFC gas in the recovery container 8 is compared with the set value. However, since the filling is performed and the filling solenoid valve 10 is automatically closed before overfilling, overfilling and underfilling can be prevented more reliably and easily.

Further, since a pair of backflow preventing solenoid valves 21 and 22 are provided in the liquefaction refining means 7 and these solenoid valves 21 and 22 are closed at the time of filling, the liquefaction is made at the time of filling the apparatus to be recovered with CFC gas. It is possible to prevent the unrefined residual CFC gas in the refining means 7 from flowing back to the recovery target device, and thus prevent the residual CFC gas from being released into the atmosphere.

In the above embodiment, the second backflow preventing solenoid valve 22 also serves as a valve for maintenance of the strainer 5, but another valve may be used.

[0022]

[0023]

EFFECT OF THE INVENTION The CFC gas recovery apparatus of the present invention is provided with a pair of backflow preventing solenoid valves in the liquefaction refining means, and automatically closes the pair of backflow preventing solenoid valves when the collected equipment is filled with CFC gas. Since the residual CFC gas in the liquefaction refining means is confined, it is possible to prevent the unrefined residual CFC gas from flowing back to the recovery target device, and it is possible to prevent the residual CFC gas from being released into the atmosphere. In addition, when the collected equipment is filled with CFC gas,
The amount of decrease measured by the device from the start of filling is recovered.
Compared with the set value input according to the device, the reduction amount is set
Since the solenoid valve for filling is closed before exceeding the value,
Prevent overfilling and underfilling more reliably and easily
There is an effect that can be.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a fluorocarbon recovery device according to an embodiment of the present invention.

2 is a flow chart for explaining the operation of the apparatus of FIG.

FIG. 3 is a configuration diagram showing an example of a conventional CFC gas recovery apparatus.

[Explanation of symbols]

1 device connecting operation valve (device connecting valve), 7 liquefaction refining means, 8 recovery container, 9 container connecting operating valve (container connecting valve), 10 filling solenoid valve, 11 metering device, 21, 2
2 Solenoid valve for backflow prevention, 23 Control device.

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F17C 5/00-5/06 F25B 45/00

Claims (2)

(57) [Claims] 1. A liquefaction and refining means for liquefying and refining CFC gas, which is connected to an equipment to be recovered via an equipment connection valve, a recovery container connected to the liquefaction and refining means via a container connection valve, and the equipment connection. A solenoid valve for filling, which is connected in parallel with the liquefaction and purification means between the valve and the container connection valve, and an unpurified residual CFC gas in the liquefaction and purification means, which is provided in the liquefaction and purification means, is liquefied and purified by the liquefaction and purification means. A pair of backflow preventing solenoid valves to be confined inside, and a pair of the backflow preventing solenoid valves and the filling solenoid valve, which are connected to the pair of backflow preventing solenoid valves at the time of filling the collected device with CFC gas. A Freon gas recovery device, comprising: a control device that outputs a signal for closing. 2. A weighing device for measuring the weight of the recovery container
Further, the control device is connected to the measuring device and the filling solenoid valve, at the time of filling CFC gas into the recovery target device, the reduction amount from the start of filling the measured value by the measuring device,
It was compared with a set value input in response to the target collection device, according to claim 1 in which said reduction is characterized and Turkey to output a signal for closing the filling solenoid valve before exceeding the set value
CFC gas recovery device described .