JP4490185B2 - Coolant replacement jig, coolant replacement device, and coolant replacement method - Google Patents

Description

  The present invention relates to a coolant replacement jig suitable for replacement of coolant of a vehicle engine such as an automobile, a coolant replacement device, and a coolant replacement method, and more specifically, for example, a hermetic reserve tank. The present invention relates to a coolant replacement jig, a coolant replacement device, and a coolant replacement method that can be applied to a vehicular engine including a hermetic radiator cooling system.

  A water-cooled engine mounted on an automobile transmits heat generated by the engine to a coolant, and dissipates this heat from a radiator (radiator) to the atmosphere. By the way, conventionally, the coolant is replaced by removing the cap of the coolant inlet (radiator filler) of the radiator and the drain plugs of the engine and the radiator, discharging the old coolant from both drains, and passing the inside of the radiator with tap water. After cleaning, the drain plugs are respectively attached, and then, new coolant is filled into the engine and the radiator from the coolant inlet of the radiator. However, such a replacement of the coolant has a problem in terms of work efficiency. In order to solve this problem, a method of reducing the pressure from the radiator cap and extracting the old coolant and injecting a new coolant after the pressure reduction (Patent Document) 1) Although a method of removing the radiator cap and upper hose to forcibly clean the inside of the engine cooling water system and injecting a new coolant (Patent Document 2) has been proposed, the former technique is used for cooling the automobile. Since the system path is complicated, it is difficult to remove the old coolant even if the pressure is reduced, and a satisfactory replacement rate cannot be obtained. The latter technique is superior to the former technique in terms of replacement rate. There was a problem that it took time from preparation work to completion of replacement.

Therefore, a technique such as Patent Document 3 has been proposed as a solution to such a problem. That is, this technology inserts the new liquid injection pipe of the replacement jig through the radiator filler so that its tip is positioned downstream in the flow direction, attaches the connection cap to the radiator filler, and removes the old liquid extraction pipe. With the tip facing the coolant in the radiator, start the engine, open the thermostat, operate the pump for injection under the control of the control device, and move from the new liquid storage tank at a constant speed. New liquid is fed through the new liquid injection pipe. As a result, the old liquid corresponding to the injected new liquid is pushed out, and when it reaches the vicinity of the radiator filler in the circulation path, the new liquid is supplied one after another. Without circulating, it flows into the old liquid extraction pipe with low resistance and is accommodated in the old liquid storage tank.
Japanese Patent Laid-Open No. 10-184359 Japanese Patent Laid-Open No. 10-47060 JP 2002-70556 A

  By the way, in recent years, a simple reserve radiator cooling system of the type described above is provided with a sealed reserve tank that is connected to a radiator and a water jacket of an engine and absorbs a change in the amount of coolant in the radiator. As a result, there have been an increasing number of completely sealed radiators. However, in this closed-type radiator cooling system, even if the replacement jig having the above-described configuration is used as the inlet of the closed-type reserve tank, the old liquid in the closed-type reserve tank cannot be sucked out. In other words, even if the connection cap is attached to the inlet of the closed type reserve tank and new liquid is sent into the closed type reserve tank, the old liquid extraction pipe is connected to the coolant in the closed type reserve tank via the connection cap. Since it only faces, there is a problem that the old liquid cannot be pushed out and cannot be used for a vehicle engine equipped with a hermetic radiator cooling system. In this case, if a special hose is attached to the inlet of the closed type reserve tank, the coolant cannot be replaced. However, since a special hose must be prepared separately, the work efficiency is affected and the cost is reduced. Is bulky.

  The present invention has been made in view of the above points, and can be applied not only to an improvement in replacement rate and workability, but also to a vehicle engine equipped with a sealed radiator cooling system having a sealed reserve tank. It is an object of the present invention to provide a possible coolant replacement jig, coolant replacement device, and coolant replacement method.

In order to solve the above-mentioned problem, the present invention according to claim 1 is a cooling fluid replacement jig that circulates in the heat exchanger system, and is formed in a coolant circulation path that constitutes the heat exchanger system. A connecting portion connectable to the opened opening is provided around the tip portion, and is disposed outside the new solution injection pipe and the inside of the new solution injection pipe, and the tip portion is injected with the new solution. Provided is a cooling fluid replacement jig characterized in that it is formed in a double cylinder structure that protrudes from the tip of a pipe and includes an old liquid suction pipe inserted into the cooling liquid. .
In the present invention described in claim 2, a new liquid is provided on the outer periphery of the front end portion of the connection portion that can be connected to the opening formed in the circulation path of the cooling liquid constituting the heat exchange system. An injection pipe and an old liquid suction pipe that is disposed inside the new liquid injection pipe and has a tip protruding beyond the tip of the new liquid injection pipe and inserted into the cooling liquid. A replacement jig formed in a double cylinder structure, a new liquid storage tank that is connected to the new liquid injection pipe of the replacement jig and stores a new liquid of the cooling liquid, the new liquid injection pipe, and a new liquid An injection pump which is interposed between the liquid storage tank and sends the new liquid in the new liquid storage tank to the new liquid injection pipe; and a suction pump which sucks the old liquid from the old liquid suction pipe There is provided a coolant exchange device characterized by the above.
In the present invention described in claim 3, further, the new liquid injection pipe is disposed between the new liquid injection pipe and the old liquid suction pipe of the heat exchanging jig, and regenerates the extracted old liquid. 3. A cooling liquid replacement apparatus according to claim 2, further comprising a regenerating means capable of supplying the cooling liquid as a new liquid.
According to a fourth aspect of the present invention, the heat exchanging system is applied to a vehicle cooling system comprising an engine water jacket, a radiator, and a simple hermetic reserve tank. A coolant exchange device is provided.
In the present invention according to claim 5 , the cooling according to claim 2 or 3, which is applied to a vehicle cooling system comprising an engine water jacket, a radiator, and a sealed reserve tank as the heat exchanger system. A liquid exchange device is provided.
The present invention according to claim 6 is a method of exchanging coolant that circulates in the heat exchanger system, and is connectable to an opening formed in a coolant circulation path that constitutes the heat exchanger system. A new liquid injection pipe disposed around the tip and disposed outside, and an old part in which the tip protrudes from the tip of the new liquid injection pipe. Using a replacement jig formed in a double cylinder structure having a liquid suction pipe, an injection pump for sending a new liquid to the new liquid injection pipe is operated to move the new liquid injection pipe into the circulation path. A cooling liquid replacement method is provided, in which a new liquid is injected, the old liquid suction pipe is inserted into the cooling liquid, and the suction liquid is directly sucked and extracted by operating a suction pump. To do.
According to the seventh aspect of the present invention, the replacement of the cooling liquid according to claim 6 is performed by inserting the tip of the old liquid suction pipe of the replacement jig so as to be positioned upstream in the circulation direction of the cooling liquid. Provide a method.
In the present invention according to claim 8, the extracted old liquid is regenerated by a regenerating means disposed between the new liquid injection pipe and the old liquid suction pipe of the heat exchanging jig, and the new liquid injection pipe is obtained. The cooling liquid replacement method according to claim 6 or 7, wherein the cooling liquid is supplied and used as a new liquid .
In the present invention according to claim 9, as the heat exchanger system, one of the claims 6-8 which is applied to the cooling system for a vehicle configured to include a water jacket, radiator and simple closed reserve tank of the engine A method for replacing a coolant according to claim 1 is provided.
In this invention of Claim 10, it applies to the cooling system for vehicles comprised provided with the water jacket of an engine, a radiator, and a closed type reserve tank as said heat exchanger apparatus system . The method for replacing the coolant according to 1 is provided.

The present invention is connected to a new liquid supply source and injects a new liquid of the cooling liquid into the circulation path from an opening formed at an arbitrary position in the circulation path of the cooling liquid constituting the heat exchange system. Use a replacement jig equipped with a new liquid injection pipe and an old liquid suction pipe that is inserted into the old liquid inside the circulation path, directly sucks the old liquid, and draws it through the opening. In addition, a new coolant was injected into the circulation path, and the old solution was sucked and extracted to replace the coolant.
As a result, preparation work and replacement work are easy, workability can be remarkably improved, and an extremely high exchange rate can be achieved. Moreover, even in a vehicle engine equipped with a closed type reserve tank that absorbs changes in the amount of cooling liquid in the radiator, that is, a so-called closed type radiator cooling system, the old liquid of the cooling liquid is directly sucked and extracted. A new liquid can be injected, the replacement of the cooling liquid is facilitated, a hose dedicated to a vehicle engine having a hermetic radiator is not required, and the cost of the apparatus can be reduced.

  Hereinafter, the present invention will be described in more detail based on the embodiments shown in the drawings. FIG. 1 and FIG. 2 are diagrams schematically showing the coolant replacement device 1 of the present embodiment, which includes a main unit 10 and a replacement jig 20.

  The main unit 10 includes a new liquid storage tank 11 in which a predetermined amount of a new liquid of the cooling liquid is stored, an injection pump 12 for injecting the new liquid stored in the new liquid storage tank 11, and an old liquid. A suction pump 13 for suction and a control device 14 for controlling the injection pump 12 and the suction pump 13 are provided. Further, the extracted old liquid can be discarded arbitrarily, but in this embodiment, the old liquid is temporarily disposed through an appropriate means, and therefore, the old liquid storage tank 15 for temporarily storing the extracted old liquid is provided. Have.

  The replacement jig 20 is configured to have two pipes, one of which is a new liquid injection pipe 21 for injecting a new liquid into the circulation path constituting the heat exchange system, and the other One is an old liquid suction pipe 22 for extracting the old liquid to the outside. In the present embodiment, the new liquid injection pipe 21 and the old liquid suction pipe 22 have a double cylinder structure. That is, the small diameter inner cylinder is used as the old liquid suction pipe 22, and the large diameter outer cylinder is used as the new liquid injection pipe 21. The old liquid suction pipe 22 is formed with such a length that its tip 22b protrudes from the tip 21b of the new liquid injection pipe 21 and can suck old liquid from a predetermined position in the circulation path. Yes.

  The rear part of the old liquid suction pipe 22 protrudes outward from the rear peripheral part of the new liquid injection pipe 21 which is an outer cylinder, where both branches, and the new liquid injection pipe 21 is connected to the injection pump 12 described above. The old liquid suction pipe 22 is connected to the connected pipe 21a, and is connected to the pipe 22a connected to the suction pump 13. In addition, a connecting cap 23 as a connecting portion that can be connected to an arbitrary opening in the circulation path constituting the heat exchanging device system is provided at the tip 21b of the new liquid injection pipe 21.

  Next, a method for exchanging the coolant in the heat exchanging apparatus system using the exchanging apparatus 1 provided with the exchanging jig 20 will be described. FIG. 3 shows a cooling system (heat exchanging device system) for a vehicle such as an automobile to be replaced with a coolant in the present embodiment, including a radiator 30, a reserve tank 40, and a water jacket 60 for the engine 50, In addition to an upper hose 70 and a lower hose 80 that connect the radiator 30 and the water jacket 60, a water pump 90, a bypass circuit 100, and a thermostat 110 are provided. The reserve tank 40 absorbs a change in the amount of coolant in the radiator 30 and is connected to the radiator 30 and the water jacket 60 of the engine 50. The water pump 90 obtains power from the engine 50 and circulates the coolant. Further, the thermostat 110 adjusts the flow rate of the coolant flowing in the bypass circuit 100 that bypasses the radiator 30 and flows the coolant and the flow rate of the coolant that flows in the radiator 30 so that the temperature of the engine 50 falls within a predetermined temperature range. This is a temperature type flow control valve.

  In such a configuration, the filled coolant includes the water jacket 60 of the engine 50, the upper hose 70, the upper tank 31 of the radiator 30, the heat transfer tube portion 32 of the radiator 30, the lower tank 33 of the radiator 30, the lower hose 80, the thermostat 110, It circulates in order of the water pump 90. Further, in the hermetic reserve tank 40, the coolant is circulated in order to absorb the change in the amount of coolant in the radiator 30. And in this circulation path, especially a cooling fluid flows vigorously in the part where a flow gathers. For this reason, if the old liquid is directly sucked in the portion that flows vigorously in such a circulation path, the old liquid can be extracted to the outside more quickly, and the new liquid can be circulated quickly along the flow. It is preferable because it can be used.

  Therefore, by connecting the replacement jig 20 through the existing opening corresponding to the portion where the coolant flows vigorously in the circulation path, or through a dedicated opening provided for replacement, the replacement can be performed more quickly. It is possible to change the coolant. As the existing opening corresponding to the portion where the coolant flows vigorously, an inlet 41 provided in the closed type reserve tank 40, other coolant inlets provided in the water jacket 60, etc. can be used. The dedicated opening can be formed near the upper hose 70, the lower hose 80, or the thermostat 110, for example.

  Specifically, in the replacement method of the present embodiment, as shown in FIG. 4, the old liquid suction pipe 22 of the replacement jig 20 is inserted through the inlet 41 of the hermetic reserve tank 40. At this time, the distal end portion 22b of the old liquid suction pipe 22 is preferably inserted so as to be positioned upstream (on the radiator 30 side) in the coolant circulation direction. If the structure cannot be inserted so as to be positioned upstream in the circulation direction of the coolant, it may be inserted as it is. Then, the connection cap 23 is attached to the injection port 41. Thereby, the front-end | tip part 21b of the new liquid injection | pouring pipe 21 faces the cooling fluid in the sealed type reserve tank 40. FIG.

  Next, under the control of the control device 14, the injection pump 12 and the suction pump 13 are driven to suck the old liquid through the old liquid suction pipe 22 and from the new liquid storage tank 11 to the new liquid injection pipe 21. New liquid is fed through. As a result, the old liquid is sucked from the old liquid suction pipe 22 and stored in the old liquid storage tank 15. When the necessary amount of new liquid has been injected, the injection pump 12 and the suction pump 13 are stopped, the connection cap 23 is removed from the injection port 41, the replacement jig 20 is removed, and the radiator cap 42 is remounted. In this method, there is no defective replacement due to air mixing, and no air bleeding operation after replacement is necessary.

  According to such an exchange method, using the exchange jig 20, it is a configuration in which the old liquid is directly sucked and extracted inside the circulation path and the new liquid is injected, so that the preparation work and the exchange work are easy. Workability can be remarkably improved and a very high exchange rate can be achieved. Moreover, even in a vehicle engine having a so-called hermetic radiator cooling system 30 that includes a hermetic reserve tank 40 that absorbs the change in the amount of the coolant in the radiator 30 as described above, the coolant can be replaced. Become. Further, a hose dedicated to the vehicle engine having the hermetic radiator cooling system 30 is not necessary, and the cost of the apparatus can be reduced.

  In the above embodiment, the method of replacing the coolant using the inlet 41 of the closed type reserve tank 40 that absorbs the change in the amount of the coolant in the radiator 30 as the coolant replacement target has been described. It is also possible to replace the coolant using a radiator filler of a vehicle equipped with a simple hermetic radiator cooling system without the hermetic reserve tank 40. In this case, as shown in FIG. 5, the old liquid suction pipe 22 of the replacement jig 20 is inserted through the radiator filler 121 of the radiator 120 and the coupling cap 23 is attached to the radiator filler 121 to inject new liquid. The tip 21 b of the pipe 21 is made to face the coolant in the radiator 120. Thereafter, the coolant may be replaced by the same operation as that of the reserve tank 40 described above.

(Example)
The vehicle coolant was replaced using the replacement device 1 provided with the replacement jig 20 shown in FIG. In Example 1, the replacement jig 20 was connected to the inlet of the sealed reserve tank for two vehicles having a sealed radiator equipped with a sealed reserve tank. In this case, as shown in FIG. 4, the tip 22b of the old liquid suction pipe 22 is inserted so as to be located upstream in the coolant circulation direction (on the radiator 30 side), and the connection cap 23 is attached to the inlet 41. Thus, the tip portion 21b of the new liquid injection pipe 21 faced the cooling liquid in the reserve tank 40. In Example 2, it carried out similarly to Example 1 with respect to the cooling system provided with the simple sealed type reserve tank. For comparison, the coolant was replaced by a conventional method. Comparative Example 1 is a method in which the old cooling liquid is removed from the radiator cap by depressurizing, and a new cooling liquid is injected after the depressurization. The injection method and Comparative Example 3 were performed by the method disclosed in Japanese Patent Laid-Open No. 2002-70556 (Patent Document 3) described in the background art section. The results are shown in the following table. Although Comparative Example 1 and Comparative Example 2 are performed for five vehicle types, workability, replacement rate, work time, and remarks are collectively shown in the following table.

(table)
Car model Model Workability Exchange rate Work time Remarks

Example 1 UCF11 sealed ○ ○ 80% 2 minutes ・ Coolant recovered to new color
(Filling LLC amount ・ Jig mounting is one-touch.
15 liters)

〃 TCR10 sealed ○ ○ 82% 2 minutes ・ Coolant recovers to new color
(Filling LLC amount ・ Jig mounting is one-touch.
15 liters)

Example 2 NCP20 Simple ○ ○ 85% 2 minutes ・ Coolant recovers to new color
(Filling LLC amount ・ Jig mounting is one-touch.
4.5 liters)

Comparative example 1 UCF11 sealed ○ × 25-60% 2 minutes ・ Coolant is almost changed
TCR10 sealed (filled LLC amount is not restored, color does not recover
NCP20 simple 2-3 liters)
KCH46 simple
LJ78 simple

Comparative example 2 UCF11 sealed × ○ 80% or more 10 minutes ・ Upper hose desorption
TCR10 sealed (more than amount of filled LLC)
(NCP20 simple 6-18 liters)
KCH46 simple
LJ78 simple

Comparative example 3 NCP20 simple ○ ○ 81% 2 minutes ・ Coolant recovers to new color
(Filling LLC amount ・ Jig mounting is one-touch.
4.5 liters) and easy (Comparative Example 3 cannot be a sealed radiator)

  In the table, “closed” indicates a closed-type radiator cooling system with a closed-type reserve tank, and “simple” indicates a simple closed-type radiator cooling system with a simple-type closed reserve tank. . “UCF11” is “CELSIOR” (registered trademark) manufactured by Toyota Motor Corporation, TCR10 is “ESTIMA” (registered trademark) manufactured by Toyota Motor Corporation, and NCP20 is “TOYOTA FUN CARGO” manufactured by Toyota Motor Corporation. (Registered trademark) and KCH46 are "Grand Hiace" (registered trademark) manufactured by Toyota Motor Corporation, and LJ78 is "Land Cruiser Prado" (registered trademark) manufactured by Toyota Motor Corporation.

As is apparent from the above table, in the present invention, a high exchange rate of 80% and 82% can be achieved in a vehicle having a hermetic radiator cooling system. Moreover, the exchange rate higher than the comparative example was able to be obtained also about the vehicle which has a simple airtight type radiator. For workability, it is only necessary to remove the radiator cap 42 and connect the replacement jig 20 to the inlet 41. This preparation work, from the start to the end of the replacement work, and the removal of the replacement jig 20 The total work time including the remounting of the radiator cap 42 was 2 minutes, which was very short.
In contrast, the comparative example 2 has a long total work time of 10 minutes or more even if the exchange rate is good, and the upper hose is troublesome to attach and detach. The comparative example 1 has a short exchange time even if the work time is short. The rate was bad. The thing of the comparative example 3 cannot be used for the engine for vehicles provided with the hermetic type radiator, as described also in the section of the problem to be solved by the invention.

  Here, in the above-described embodiment, a means for temporarily collecting the extracted old liquid in the old liquid storage tank 15 and then disposing it is adopted. It is possible to adopt a configuration in which reproduction processing is performed by a reproduction unit as reproduction means having As such a regeneration processing unit, a metal rust, a precipitate formed by dissolving dissolved metal into particles, a filtration device equipped with a filter for removing precipitates of additives, etc., a process for recovering rust prevention power equivalent to new LLC There is a reproducing apparatus provided with means, and these are used alone or in appropriate combination. FIG. 6 shows a configuration in which regeneration processing is performed by the regeneration unit 130 when the coolant is exchanged using the radiator filler 121 of the simple hermetic radiator 120 described above. That is, the regeneration unit 130 includes a regeneration tank 132 having a regeneration processing unit 131, an infusion pump 133 and a suction pump 134 connected to the regeneration tank 132, and these infusion pump 133 and suction pump 134. And a control device for controlling. The new liquid injection pipe 21 of the replacement jig 20 is connected to a pipe connected to the injection pump 133, and the old liquid suction pipe 22 is connected to a pipe connected to the suction pump 134.

  Then, the old liquid suction pipe 22 of the replacement jig 20 is inserted through the radiator filler 121 of the radiator 120, and the connecting cap 23 is attached to the radiator filler 121, so that the tip 21b of the new liquid injection pipe 21 is attached to the radiator. Let it face the coolant in 120. Therefore, the old liquid recovered from the radiator 120 is immediately stored in the regeneration tank 132 through the regeneration processing unit 131 and is supplied again from the regeneration tank 132 into the radiator 120, so that stable operation is immediately performed. This is repeated, the cooling liquid is forcibly circulated in the cooling system, and the old liquid is regenerated and replaced with a new liquid. Compared with Japanese Patent Application Laid-Open No. 2002-70556 (Patent Document 3) described in the background art section, since the stable operation can be performed immediately after the operation, the number of circulations within a predetermined time increases and the number of times passing through the regeneration processing unit 131 increases. Therefore, there is an advantage that the reproduction performance is further improved.

  In the above-described embodiment, a mode applied to a cooling system of a vehicle (automobile) is described as an example. However, this embodiment is also used when replacing other heat exchange devices, for example, a coolant used in floor heating of a house. It is possible to apply the invention.

FIG. 1 is a schematic view showing an embodiment of the coolant exchange apparatus of the present invention. FIG. 2 is an enlarged view of a replacement jig in the above-described coolant replacement apparatus. FIG. 3 is a schematic diagram showing a cooling system of an automobile. FIG. 4 is a diagram for explaining an example of the coolant replacement method of the present invention. FIG. 5 is a diagram for explaining another example of the coolant replacement method of the present invention. FIG. 6 is a diagram for explaining an example in which an old solution is regenerated and used as a new solution.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Main body unit 11 New liquid storage tank 12 Injection pump 13 Suction pump 15 Old liquid storage tank 20 Replacement jig 21 New liquid injection pipe 22 Old liquid suction pipe 23 Connection cap 30 Radiator 40 Sealed reserve tank 41 Inlet 50 engine

Claims (10)

A jig for replacing the coolant circulating in the heat exchange system,
A connection part connectable to an opening formed in the circulation path of the coolant constituting the heat exchange system is provided around the tip part, and a new liquid injection pipe disposed outside,
An old liquid suction pipe that is disposed inside the new liquid injection pipe and has a tip protruding beyond the tip of the new liquid injection pipe, and is inserted into the cooling liquid;
It is formed in the double cylinder structure provided with this . The jig | tool for replacement | exchange of the cooling fluid characterized by the above-mentioned. A connection part connectable to an opening formed in the circulation path of the cooling liquid constituting the heat exchange system is provided around the tip part, and a new liquid injection pipe arranged on the outside, and the new liquid injection pipe The replacement is formed in a double cylinder structure including an old liquid suction pipe inserted into the cooling liquid, the tip of the new liquid injection pipe protruding from the tip of the new liquid injection pipe. Jig for
A new liquid storage tank connected to the new liquid injection pipe of the replacement jig and storing a new liquid of the cooling liquid;
An injection pump that is interposed between the new liquid injection pipe and the new liquid storage tank, and sends the new liquid in the new liquid storage tank to the new liquid injection pipe;
A suction pump for sucking the old liquid from the old liquid suction pipe;
An apparatus for exchanging a coolant, comprising: Furthermore, it is disposed between the new liquid injection pipe and the old liquid suction pipe of the heat exchanging jig, and the old liquid extracted is regenerated and used as a new liquid for the coolant to the new liquid injection pipe. 3. The coolant replacement apparatus according to claim 2, further comprising a regenerative unit that can be supplied. 4. The coolant exchange device according to claim 2, wherein the coolant exchange device is applied to a vehicle cooling system including an engine water jacket, a radiator, and a simple sealed reserve tank as the heat exchange system. 4. The coolant exchange device according to claim 2 or 3, wherein the coolant exchange device is applied to a vehicle cooling system comprising an engine water jacket, a radiator, and a closed reserve tank as the heat exchange system. A method for replacing a coolant circulating in a heat exchange system,
A connection part connectable to an opening formed in the circulation path of the cooling liquid constituting the heat exchange system is provided around the tip part, and a new liquid injection pipe disposed on the outside, and the new liquid injection Using an exchange jig formed in a double cylinder structure including an old liquid suction pipe that is disposed inside the pipe and has a tip part protruding from the tip part of the new liquid injection pipe ,
Injecting new liquid into the circulation path from the new liquid injection pipe by operating an injection pump for sending new liquid to the new liquid injection pipe, and inserting the old liquid suction pipe into the cooling liquid, A method for replacing a cooling liquid, comprising operating a suction pump to directly suck and extract old liquid. The coolant replacement method according to claim 6, wherein the coolant replacement pipe is inserted by inserting the tip of the old fluid suction pipe of the replacement jig so as to be located upstream in the circulation direction of the coolant. The extracted old liquid is regenerated by a regenerating means disposed between the new liquid injection pipe and the old liquid suction pipe of the heat exchanging jig, and the new liquid injection pipe is used as a new liquid for the cooling liquid. The method for replacing a coolant according to claim 6 or 7, wherein the coolant is supplied and used . The coolant replacement according to any one of claims 6 to 8, which is applied to a cooling system for a vehicle including an engine water jacket, a radiator, and a simple sealed reserve tank as the heat exchange device system. Method. The method for replacing a coolant according to any one of claims 6 to 8, which is applied to a cooling system for a vehicle including an engine water jacket, a radiator, and a sealed reserve tank as the heat exchange device system. .

Images