SE418769B - DEVICE FOR DRAINING REFRIGERANT FROM REFRIGERATOR AND HEATER - Google Patents

Description

l190¶NIll¶ilN fi Wl.Y- ~ '“V'G§'í7'l Tlfüt -' 'IWF-vb' 7907683-2 The invention is described in more detail below in connection with the accompanying drawing, there the figure shows a sketchy diagram of an equipment according to the invention.

The device shown in the figure comprises a compressor 1 with a drive motor 2.

The drive motor 2 is also arranged to drive a fan 3 for air transport through a con- densor üÄ'Furthermore, the order includes a heat exchanger and a tank 5. The compressor 1 is connected on its suction side to the tank 5 and on its pressure side in series with con- - ~ the sensor Ä, the heat exchanger, a filter 9 and a filling tube 13, as the device is intended to interact with. The inlet side of the condenser Ä is also connected to an line 1h intended to be connected to the system to be emptied on the cooling medium. A non-return valve 8 is arranged between the connecting line lä and the condenser Å and arranged to allow flow only in the direction of the condenser Ä.

The connection line was further connected via a solenoid valve 6 and a throttle or expansion valve 7 to the interior of the tank 5. In the interior of the tank 5 are present heat exchanger in the form of, for example, a pipe loop 17.

Furthermore, there is a pressure switch 10, a pressure-controlled safety valve 11, and a pressure controlled valve 12. 1 In the following, the function of the device is described and in connection with this it is explained for the wires of the device and its connections.

When a system containing refrigerant is to be emptied, the connection the line 1h to the facility in question. In this case, the solenoid valve 6 is kept closed and compressor 1 idle. Cooling medium then flows through a line 15, through a surface further line 16 via the non-return valve 8 and further through the condenser h the exchanger 17 and the filter 9 to the tube 13. Coolant also flows down to the compressor via a line 18. The safety valve 11, like the pressure-controlled valve 12, is closed.

The safety valve 11 is connected in parallel across the non-return valve 8. The pressure controlled valve 12 is located on a further line 20 to the tube between an i the tube 13 opening upper tube 25 and the connecting line lay.

After the pressure in the device has been equalized with the pressure in the system, which to be drained, the solenoid valve 6 is opened and the compressor 1 is started. The refrigerant flows in this case directly from the line lü via the line 15, the solenoid valve 6 and the choke 7 down into the tank 5. The compressor 1 is arranged to suck refrigerant, the normal state of which is a gaseous form from the upper part of the tank 5 from a pipe 19, compress this and thereby press the coolant, via the line 18, through the condenser Ä, which in a known manner is arranged to transfer the gaseous refrigerant to liquid form. The refrigerant thus cooled flows through the heat exchanger 17 and the filter 9 to a mouthpiece in the lower part of the tube 13 pipes 26.

A pressure builds up under the influence of the compressor on its pressure shaft, which considerably exceeds the pressure in the lines 1Ä, so that refrigerant cannot pass non-return valve 8 to the condenser 4.

The compressed refrigerant emits heat to the tank in the heat exchanger 17 existing coolant around the heat exchanging loop 17, which results in the tank 5 pre-existing refrigerant is gasified by hand.

IN -'- ': www v »~ vf ute: mil-lamt: tv -... lezxun-.rnrrm uns fi avmwrexawuuuvnnmauananu- hån-e 'fi 7907633-2 3 When the pressure in the tube 13 has risen to a predetermined level, the pressure - controlled valve 12, whereby gaseous cooling medium in the tube is sucked via the line_15, _ven- tilen 6 and the throttle 7 down into the tank 5, Hereby comes dot gaseous coolantgfg _ medium in the tube 13 to be transferred in the condenser Ä to liquid form, whereby the tube 13 eventually becomes completely filled with liquid refrigerant. 1 __ "0 a predetermined level depends on the desired degree of filling in the tube 13. Through the circulation of gas in the tube 13 at the compressor 1, the condenser Ä and the heat exchanger 3 17 a cooling of the coolant in the tube 13 takes place.

Said circulation can take place while the line was connected to the system to be emptied, but can also take place after the line lk has been shut down by means of a crane 22.

When the tube 13 is completely filled with liquid coolant, the line 20.2i at the tube by means of taps 23.2Å.

When refilling a drained system, connect the tube to the system on usual manner, which, however, is not encompassed by the present invention.

The pressure switch 10, which is arranged to sense the pressure on the compressor pressure side, and the safety valve ll can be omitted or replaced with other components.

The safety valve 11 is arranged to press the compressor at an increased pressure pressure side release coolant via line 14.

The pressure switch 10 is arranged by means of electrical conductors (not shown) and devices turn off the compressor 1 at an elevated pressure on its pressure side.

The filter 9 is not necessary but is preferred. The filter is of known conventional type and may be arranged to separate dirt, acids and water or other from the refrigerant.

The expansion valve or throttle 7, of known type, is intended to reduce the speed, by means of which coolant from the system to be drained flows down in the tank 5.

Of course, the safety valve 11, the pressure switch 10 and the pressure-controlled one must The working area is also selected with regard to the area of use of the present device. designed for, i.e. with regard to the type of refrigerant, the capacity of the one and type of tube 13.

As an example, it may be mentioned that when draining the refrigerant freon in the room temperature is after the compressor started the pressure on its suction side about 0.5 - S atm and on its print side about 12 - 15 atm. The temperature of the coolant is before those in the condenser approx. +60 - 80 ° C and after the condenser ~ approx. +20 - 30 ° C. After heating the exchanger, the temperature of the refrigerant is about +10 - 15 ° C.

Under these exemplary conditions, the safety valve 11 is set at 30 atm and the pressure switch at 20 - 25 atm. The pressure controlled valve 12 is adjusted accordingly. type of tube 13, but may by way of example be arranged to open at a pressure in the tube. legs of 10 atm. 'Ü _, ... a .tro-kurmin'.wåíëšxláiffu flflfi ïšüïfäñkwetatzmänq- chou-J * .Z Jah-mmm; '' .'__, _ Jnfwpq-'r-, r- ~ u, - ~ f - 4-v, -_-, .. f _.._ ._, ......- .., _.-.__. _ .., __. _,., ....,. ___... _ _ . a. t-v-lyuø-c-lv fi ê fi Ffl Å . in 1 in 7907683-2 As an example, it can be mentioned that the tube 13 in normal-sized cooling systems is and s.k. 60 kg tub. Of course, both smaller and larger tubes, as well as several parallel or in series connected tubes andvän6, p. l The present invention thus provides a device by means of which a system containing refrigerant can be completely emptied and stored in a filling tube, which can be filled substantially completely, to be refilled later in the system. Up- The finding thus effectively eliminates the inconveniences mentioned at the outset bottling of systems in a conventional manner. _ Above, the present invention has been exemplified by the one in the figure showed the embodiment. All those in connection with the description and the figure said and shown components are of suitable known type and are commercial available.

Of course, the shown embodiment of the device according to present invention is varied without departing from the inventive concept. IN Thus, the present invention is not to be construed as limited thereto the above embodiment but may be varied within the scope of the appended claims specified frame.

Claims (3)

Patent claims Device for draining cooling media from cooling and heating units, such as for example heat pumps and larger cooling equipment, characterized in that a connecting line (1b) is present intended to be connected to the system to be drained, which connecting line (lay) opens into a closed tank (5). that a compressor (1) is present connected on its suction side to said tank (5) and on its pressure side connected in series with a condenser (Å), a heat exchanger (17) in or at said order, wherein under said tank (5 ) and a filling tube (13) or the like 1 in the operation of the compressor (1) coolant flows down into the tank (5) from the connection line (1Å), is colored in the tank (5), is compressed by the compressor (Ä), condenses and emits heat at passage of the heat exchanger (17) and via a line (21) the tube (13) is filled. 2. Device according to claim 1, characterized in that along said connecting line (iÄ, 1S) there is a valve (6) arranged to leave the line open or closed and that said line (1h, 15) between its end facing said tank and said valve (6) is connected via a line (16) and a non-return valve (8) directly to the condenser (H), which non-return valve (8) is arranged to allow flow of medium only from the connecting line (ih) in the direction of the condenser (Ä). ), whereby in an initial stage of draining refrigerant when said valve (6) is closed and the compressor (1) is inactive, refrigerant is allowed to flow from the connection line (ih) via the condenser (Å) and the heat exchanger (17) to the filling tube (13) . 3. Device according to Claim 1 or 2, it may be claimed that the connection "is" connected to the tube (1;) ïmedelšt "ë fi" ytèrli§are "TëdñTñg '(20) to said filling tube (20). 13), which opens into the upper end of the tube (13), where behind said further line (20) a pressure-controlled valve (12) is arranged to allow passage through the line "(20) when the pressure in the tube (13) exceeds a predetermined level.