JPS58102076A - Service device for refrigeration system using high boiling-point refrigerant - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in service equipment for refrigeration systems using high boiling point refrigerants.

In general, a refrigeration system using a high boiling point refrigerant has a configuration as shown in FIG. 1, and the service equipment used in this system has conventionally been installed as shown in FIG. The dotted line in Figure 1 indicates, for example, automotive refrigerant R.
-12 system, 1 in the figure is the compressor. This combination, S1 includes capacitor 2, receiver S
1 expansion valve 4 and F 44! The rotor 5 is connected to the high pressure piping 6, respectively.
. . , are connected in clockwise order via low pressure piping 1 . An r-manifold 9 constituting a service device having a cavity inside is connected to both ends of the system 1 through charge hoses at and S@. In addition, at the bottom of the r-zomanifold 9,
A cylindrical protrusion 10%, 10 m, the inside of which communicates with the cavity of the gauge manifold 9, is provided, and these cylindrical protrusions 10
1,101, the charge hose g1. g is connected.

At the top of the gauge manifold 9, a cylindrical protrusion 111ell@, the interior of which communicates with the cavity of the Durzov=holt 9, is provided so as to be located directly above the protrusions 10@, 10g. A high pressure pipe 12 and a low pressure pipe 13 are attached to the cylindrical protrusion 111.11g, respectively. t
In addition, the cylindrical protrusion 10 at the bottom of the gauge manifold 9
, 10. The lever is provided with 10 cylindrical protrusions of the same shape.

A charge hose 8 is connected to this cylindrical protrusion 10 m, and the other end of the charge hose 8 is connected to the refrigerant during air venting and refrigerant charging. The pump 14 is connected and the vacuum b
At the same time, a vacuum bonder 15 is connected. Further, at both end portions of the r-zomanifold 9, pores are formed that communicate with the cavity of the r-zomanifold 9 and penetrate to the tip. A low pressure operation valve 16 and a low pressure operation valve 17 are provided.

The refrigerant supply operation and refrigerant exchange operation by the service device having such a structure are performed as follows.

(i) Refrigerant supply operation (+-1) First, the high pressure operation valve IC and the low pressure operation valve 17 of the Guzo manifold 9 are opened. Next, a charge hose 83 connected to the cylindrical protrusion 10s of the r-zo manifold 9
The vacuum bonder 15 is activated by connecting it to the t-vacuum 47g 15. As a result, the air in the system is removed from the charge hoses a, , 8. ,? ” - is discharged from the vacuum bonder 15 via the manifold 9 and the charge hose 83.

(G2) Air vent if? '-The high-pressure operating valve 16 and the low-pressure operating valve 11 of the control manifold 9 are closed. Next, the charge hose 83 is removed from the vacuum tube flB, and the refrigerant is connected to the vacuum tube 14. Next, the refrigerant tank 14 is opened, and the connection between the cylindrical protrusion 103 and the charge hose 8s is loosened, and the refrigerant gas in the refrigerant tank 14, for example, QC/
, F2 (boiling point -29.8° C. at atmospheric pressure) begins to blow out from the connection due to gas pressure, then tighten the connection. As a result, the air within the charge hose 81 is released to the outside.

(G3) Open the refrigerant charge low pressure operation valve 17. As a result, the refrigerant flows from the refrigerant chamber 14 through the charge hose 83, the r-no manifold 9, and the charge hose 8s into the system.
High pressure r-zo 12 set in r-jimanifold 9, low pressure goo? ) 13 are different from equal pressure, compressor 1
to charge a predetermined amount of refrigerant. Incidentally, after the charging is completed, the high pressure operation valve 16 is closed, and the pulp of the refrigerant pump 14 is closed.

[11] Refrigerant exchange operation (ii-1) With the refrigerant and compressor 1 stopped, open the high pressure operation valve Jlif.
Alternatively, open the low pressure operation valve 1, remove one end of the charge hose 81 from the refrigerant generator 13, and open the refrigerant in the system.
- Noyage to the outside through Zomanifold 9 and charge hose 8m.

Thereafter, in the same manner as above, (1-1) evacuation, (1-2) air removal, and (1-3) refrigerant replacement are performed to complete the refrigerant exchange operation.

However, in the service device having the above-described structure, the connection between the cylindrical protrusion 4g of the r-manifold 9 and the charge hose 8s is loosened and tightened when air is vented, resulting in a decrease in work efficiency.

In addition, high boiling point refrigerants such as R-11 (chemical formula cct, v,
When a refrigerant (boiling point at atmospheric pressure of 23.6°C) is used in a system, the refrigerant remains in liquid form at room temperature. required time.

The present invention has been made in view of the above circumstances, and has good workability when removing air, and allows easy evacuation and refrigerant charging operations in systems using high boiling point refrigerants, as well as rapid refrigerant purging. The object of the present invention is to provide a service device for a refrigeration system using a high boiling point refrigerant.

Hereinafter, a case in which a service device for a refrigeration system using a high boiling point refrigerant, which is an embodiment of the present invention, is applied to an automotive air conditioner system using a high boiling point refrigerant will be described with reference to FIGS. 2 and 3. In addition, in FIGS. 2 and 3, the same members as those shown in FIG.

In Figure 2, 21 is the first, second, third, and fourth on all sides.
This is an r-dimanifold having connection ports J71 and J24. A charge hose 231 is connected to the first connection port 221 of the r-no manifold holder 21, and the other end of this charge hose 231 is connected to the high pressure pipe 6 that connects the receiver 3 and the expansion valve 4 in the system. . The second connection port 22 of the Guzo manifold 21! A charge hose 21m is connected to the charge hose 23, and the other end of the charge hose 23 is connected to a low-pressure pipe 7 that connects the compressor 1 and the energizer 5 in the system. Further, a charge hose 283 is connected to the third connection port 223 of the r-jimanifold 21.
The other end is connected to a high boiling point refrigerant 25 housed in a refrigerant container 24 .

Furthermore, the fourth connection port 224 of the r-Zoma manifold 21
A vacuum ring 15 is connected to the charge hose 234 through a charge hose 234. The first and second of the r-dimanifold 21
The connection ports 221 and 22 are respectively provided with a high pressure r-zo 26 that mainly measures the high pressure of the system and a low pressure r-zo 2r that mainly measures the low pressure of the system. And, on the wall of each connection port 221 to 224 of the r-jinifold 21, r-zo! Side holes communicating with the cavity inside the Nifold 21 are provided, and each side hole has an operating valve 281 that can be opened and closed.
.about.284 are provided, respectively.

The refrigerant supply operation and refrigerant exchange operation by the service device having such a structure are performed as follows.

[1] Refrigerant supply operation (1-1) Vacuuming the operation valve 211 of the r-zomanifold 21 as shown in FIG.
1. 211, open the 284 and close the operating valve 28m, operate the vacuum 4nd 15, and finally open the operating valve 1s.
The process ends when jltl is closed.

As a result, the system's high pressure line is connected to the charge hose: I
31, Vacuum 4 as shown by the arrow through the p-jimanifold 21
Similarly, the low pressure line is sucked into the vacuum $:/fil as shown by the arrow through the charge hose ZS, C-dimanifold 21. In the above operation, the vacuum state is r-di-ni-fold. High pressure r installed in 21
-yxtt, can be monitored by low pressure r-ji 21.

(ii-z) Air bleeding First, the operation valve 21j1*jIj is closed, and the operation valves gas and xa are opened. Next, connect both ends of the charge hose 23 to the third connection port 2 of the r-no manifold 21.
2s and the refrigerant 25 in the refrigerant container 24, and both ends of the charge hose 2340 are connected to the fourth connection port 224 of the r-jimanifold 21 and the vacuum 4fil, and the vacuum pumper 15 is operated for a short time. (Illustrated in Figure 5). As a result, the charge hose 23s and the r-zomanifold 21
The air inside is discharged as shown by the arrow, and the refrigerant XS is sealed inside them.

0i-3) Refrigerant Charging First, from the air-bleeding state, as shown in FIG. 6, the operation valve 284 is closed and the operation valve 283 is opened, and the underlessa 1 is connected. As a result, the refrigerant xsB refrigerant container 24
Intake of compressor 1 via charge hose 2ss, r-zomanifold 21, and charge hose 23m
), and the high boiling point refrigerant 25 is charred into the system. Next, after charging a predetermined amount of high boiling point refrigerant 25, the operating valve 2g is closed. Incidentally, the operating state in the above operation can be monitored by the high pressure darzo zg and the low pressure r-ji 21. Finally, remove the charge hose 231*JJ1 from the connection with the high pressure pipe 6 and low pressure pipe 1 in the system and remove the system from the service equipment! In this case, the connection between the charge hose zsl and the high-pressure pipe 6 and the connection between the charge hose xsl and the low-pressure pipe r are each provided with a nozzle, so the refrigerant in the system does not leak.

(it) Refrigerant exchange operation (if-1) Refrigerant/Archive First, remove the charge hose 23 from the third connection port IIs of the r-no manifold 21. Next, as shown in FIG.
Continue. Note that this refrigerant pump S0 is cooled by immersing it in a container 32 containing a refrigerant 31 such as cold water, ice, or dry ice. Next, the charge hose 231 attached to the first connection port 221 of the r-dimanifold 21 is connected to the high-pressure pipe CK between the receiver 3 and the expansion valve 4 in the system, and the The charge hose Jjj,i attached to the connection port 22. is connected to the low pressure piping 1 between the compressor 1 and the evaporator 4 in the system.

Next, the operation valves 281 to zg= are opened, and the operation valve 284 is closed. As a result, the refrigerant in the system continues to cool until the internal pressure of the refrigerant drops to the saturation pressure at the temperature of the refrigerant 30 (hereinafter referred to as /y guaudo). The refrigerant is collected in the refrigerant pump 30, and the refrigerant in the system is purged.

Thereafter, as described above, (i-1) evacuation, (1-2) air removal, and (+-3) refrigerant charging are performed to complete the refrigerant exchange operation.

Therefore, according to the service device shown in FIG. 2, there is no need to loosen or tighten the connecting portion between the barrel protrusion of the R-jimanifold and the charge hose when air is vented, as is the case in the prior art, and the workability is good.

t7't, Servicing of automotive air conditioning systems that use high boiling point refrigerants For example, vacuuming and refrigerant charging can be done easily and reliably, and when refrigerant is removed, the refrigerant in the system can be removed from the refrigerant. It can be quickly collected into the pump 30. Furthermore, since the recovered refrigerant can be reused, resource and energy savings can be achieved compared to conventional devices.

Note that the operation of the refrigerant in the service device is not limited to the method using the device configured as described above, but may be performed as described below. In other words, as shown in FIG. .2B is open, 2
8@, 284 is closed, and the on-off valve 33 newly provided in the middle of the high-pressure pipe 6 between the receiver 3 and the expansion valve 4 in the system is closed, and the compressor 1 is operated.

As a result, the refrigerant is drained from the system's high pressure lines.
The refrigerant is forced into the pump 30 via the Y-nifold 21,
Compared to the embodiment, rapid refrigerant flow can be achieved, and the operation valve 28 can be used.

xal, xs4 are opened, 28s is closed, and the vacuum pump 15 is connected to the fourth connection port 224 of the r-dimanifold 2 via the charge hose 234, so that the refrigerant and -ji is also possible.

As detailed above, according to the invention, the workability during air removal is excellent, and in a system using a high boiling point refrigerant, vacuum evacuation and refrigerant charging operations can be performed easily and reliably, and the operation can be performed rapidly. It is possible to provide a service device for a refrigeration system using a high boiling point refrigerant, such as an air conditioner system using a high boiling point refrigerant for automobiles, which is capable of refrigerant/gauge.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventional refrigeration system using a high boiling point refrigerant and a service device used in this system. FIG. 2 is an explanatory diagram of a refrigeration system using a high boiling point refrigerant of the present invention and a service device used in this system. 3 is an enlarged sectional view of the r-di manifold in the service equipment shown in FIG. Fig. 6 is an explanatory diagram of the charge hose and the r-di manifold when air is removed from the r-di manifold in the illustrated service equipment. Figure 7 is an explanatory diagram of the Or gauge manifold when suctioning to the suction &-), and Figure 7 is an explanatory diagram of the r-di-ni-fold, etc. at the time of I blowout, which recovers the refrigerant in the system to the refrigerant tank in the service equipment shown in Figure 2. , FIG. 8 is an explanatory diagram showing a refrigeration system using a high boiling point refrigerant and a service device to explain rapid purge. 1... Console, Su, 2--Capacitor, 3--Register, p4.4-- Expansion valve, 5... Eva 4-theta, 6-
...High pressure piping, y-...Low pressure piping, 14...Refrigerant pump, 15...Vacuum inlet, 21...-C-Dimanifold,
Figure 3! l! H 1s4 Figure 5

Claims (1)

[Claims] An r-Jimae Fold equipped with connection ports on all sides with operating valves that can be opened and closed, a refrigeration system in which a high pressure part side and a low pressure part side are connected to the 11th and 2nd connection ports of the Jin's R-Zoma Manifold, and the gauge. A service device for a refrigeration system using a high boiling point refrigerant, comprising a refrigerant supply and receiving member connected to a third connection port of a manifold, and a vacuum pump connected to a fourth connection port of the gauge manifold.