JPH03160340A - Method for supplying cooling water to test internal combustion engine - Google Patents

Abstract

PURPOSE:To prevent the generation of rust at the time of stock and to make the concn. of an antifreezing solution constant by supplying a diluted antifreezing solution prepared by mixing a high concn. antifreezing solution with dilution water as cooling water and removing the same so as to make the residual amount thereof constant after the completion of a test. CONSTITUTION:The high concn. antifreezing solution 2 quantitatively supplied from a main tank 1 and dilution water 13 are mixed in a sub-tank 7 to prepare a diluted antifreezing solution 18 having desired concn. The diluted antifreezing solution 18 is supplied to a supply tank 20 through a supply pipe 22 to be supplied to an internal combustion engine 39 subjected to a test run. After a required test is conducted, the supply of the diluted antifreezing solution 18 is interrupted by closing an opening and closing valve 38 and the diluted antifreezing solution 18 in the internal combustion engine 39 is removed so as to make the residual amount thereof constant. As mentioned above, since the residual amount is entirely composed of the diluted antifreezing solution 18, the generation of rest in the internal combustion engine 39 at the time of stock can be prevented and, when the concn. of the diluted antifreezing solution 18 in a cooling and assembling process is matched with that of the diluted antifreezing solution 18 used after assembling, the concn. of the diluted antifreezing solution can be always set to a desired constant value.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for supplying cooling water to an internal combustion engine undergoing a performance test using an internal combustion engine testing device. Conventional technology Internal combustion engine testing involves connecting the fuel supply hose, cooling water supply hose, cooling water drainage hose, exhaust gas duct, etc. to the internal combustion engine installed at the test location, and connecting the main shaft of the internal combustion engine to the test equipment. One end of the operating shaft is interlocked with the other end of the operating shaft, and a drive device (such as a direct current motor) for starting the internal combustion engine is interlocked with the other end of the operating shaft, and this drive device causes the main shaft of the internal combustion engine to start rotation (motoring). This was later achieved by operating an internal combustion engine. During such operation, the temperature inside the internal combustion engine is, for example, 70°C to 80°C.
Temperature-controlled cooling water was poured into the tank to provide the desired cooling.
After the internal combustion engine is stopped at the end of the test, the cooling water remaining inside the engine is removed. In other words, in the conventional type, a cooling water supply/discharge device as seen in, for example, Japanese Utility Model Application Publication No. 61-92716 has been provided.In this conventional type, the first path (hose) is connected to the cooling water inlet of the internal combustion engine, and the cooling water is A second route (hose) is connected to the water outlet. Then, by operating the discharge pump installed in the first path, the cooling water (industrial water) in the cooling water tank is supplied from the first path to the internal combustion engine via the cooling water inlet, and from the cooling water outlet. The used cooling water is drained into the cooling water tank via the second path.After the intended test, the cooling water withdrawal path with a blower is connected to the first path. By connecting the air introduction path to the second path and operating the blower, the cooling water remaining in the internal combustion engine is suctioned and removed.At this time, the residual water is not completely removed;
An almost constant amount of water remains. It is also possible to use a pressure method instead of the suction method. Internal combustion engines that have completed their intended testing in this way are stored. Internal combustion engines that are stocked in this way are taken out in response to requests from, for example, an automobile manufacturing line and assembled into the car body. Concentrated antifreeze is added. Problems to be Solved by the Invention According to the conventional method described above, rust occurs in the internal combustion engine due to residual water while it is being stocked. Furthermore, since residual water affects the concentration of antifreeze added, it is necessary to eliminate variations in the amount of residual water.
However, when removing cooling water using the above-mentioned blower, etc., it is difficult to maintain a constant amount of removed water, and moreover, uneven water droplets (moisture) adhere to the inner surface of the water channel inside the internal combustion engine.
is added to the residual water volume, making it difficult to stabilize the residual water volume. Therefore, variations in the concentration of antifreeze occur, which are often fed back to the test line as complaints from downstream processes. An object of the present invention is to provide a method for supplying cooling water to a test internal combustion engine that does not cause rust when stocked and can always keep the concentration of antifreeze at a desired value. Means for Solving the Problems In order to achieve the above object, the method of supplying cooling water to a test internal combustion engine according to the present invention includes a main tank for high concentration antifreeze, and a first rf! 11jI! A second rI! is connected to the dilution water supply device via a valve! A sub-tank side that has a sub-tank connected via a J-closing valve and a diluted antifreeze supply tank connected to this sub-tank via a third on-off valve, and the sub-tank side discharges the diluted antifreeze liquid to the test internal combustion engine side. According to the instructions from the operator, one of the first on-off valve or the second on-off valve is opened to supply a predetermined amount of either high-concentration antifreeze solution or dilution water, and then the high-concentration antifreeze solution is supplied by closing one valve and opening the other. Supplying a predetermined amount of the other of antifreeze and dilution water to create diluted antifreeze with a predetermined concentration in this sub tank, and opening the third on-off valve according to instructions from the supply tank that discharged the diluted antifreeze. The diluted antifreeze in the sub tank is being transferred to the supply tank. According to the configuration of the present invention, a diluted antifreeze having a desired concentration can be created and stored by mixing the high concentration antifreeze and dilution water supplied in a fixed amount in the sub tank. The diluted antifreeze is then transferred from the auxiliary tank to the supply tank according to the demand instructions from the supply tank, and is then supplied as cooling water to the internal combustion engine being operated for testing. After conducting the intended tests, the diluted antifreeze is removed from the internal combustion engine with a constant amount of residual water, but since all of the remaining water is diluted antifreeze, no rust will occur in the internal combustion engine. EXAMPLE An example of the present invention will be explained below based on the drawings. 1 is a main tank that stores high-concentration antifreeze 2, and is installed outdoors 4 outside a wall 3. High-concentration antifreeze liquid 2, which has been transported by a tank truck, is introduced into the main tank 1 through a receiving pipe 5. A sub-tank 7 is installed indoors 6, and the sub-tank 7 and the main tank 1 are connected by a first supply pipe 10 with a first pump 8 and a first on-off valve 9 interposed therebetween. Furthermore, a second on-off valve 11 is provided in the sub tank 7.
A second supply pipe 12 is connected therebetween. This second supply pipe 12 is an example of a supply device for dilution water (industrial water, etc.) 13. The sub tank 7 has four water level detectors arranged vertically. That is, an abnormally high water level detector 14 is provided at the top to activate and make an emergency stop when the water level is abnormal, and below it is installed to activate when high concentration antifreeze 2 and dilution water 13 are supplied in fixed amounts. A mixing water level detector 15 is provided to stop the supply. When the high-concentration antifreeze liquid 2 is supplied in a fixed quantity below the mixed water level detector 15, it is activated to stop the supply and also to stop the supply of the diluted water 1.
An initial water level detector 16 is provided below which supplies the high concentration antifreeze 2, and a low water level detector 17 is provided below the initial water level detector 16 which is activated when the diluted antifreeze 18 reaches its discharge limit to stop the discharge and supply the high concentration antifreeze 2. ．． Furthermore, a supply tank 20 is installed below the sub-tank 7 in the indoor space 6, and the supply tank 20 and the sub-tank 7 are connected by a third supply pipe 22 with a third on-off valve 21 interposed therebetween. Three water level detectors are arranged in the supply tank 20 in the vertical direction. In other words, in the upper part, 1 part of diluted antifreeze is added when the water level is abnormal.
An abnormally high water level detector 23 is installed to emergency stop the supply of the diluted antifreeze liquid 18 or issue an alarm.
A receiving water level detector 24 is provided which operates when a fixed amount of antifreeze is supplied to start supply from the sub tank 7, and further below, which operates when diluted antifreeze 18 is abnormally discharged to prevent the discharge from occurring in an emergency. An abnormally low water level detector 25 is provided to issue an alarm when the water stops. Each of the detectors 14
~27. Reference numerals 23 to 25 are, for example, float switch types, and each of the tanks 7 and 20 has an instruction (
Heads 26 and 27 for signals) are provided. A temperature control N device 30 for adjusting the temperature of the diluted antifreeze liquid 18 in the supply tank 20 to, for example, 70° C. to 80° C. is installed below the abnormally low water level detector 25 and connected to a heat source piped inside the supply tank 20. an exchange section 31 and a steam supply section 33 that is connected to the upper end of the heat exchange section 31 and supplies steam 32.
and a drain discharge section 3 connected to the lower end of the deep exchange section 31.
It consists of 4. A second pump 36 is interposed in the diluted antifreeze supply pipe 35 communicating with the lower part of the supply tank 20, and the diluted antifreeze supply pipe 35 further extends to the test equipment and branches into a plurality of distribution pipes 37. Each distribution pipe 37 has a fourth
An on-off valve 38 is interposed, and the end of the distribution pipe 37 can be freely connected to a cooling water supply 40 of an internal combustion engine 39. Further, the discharge pipe 42 which can be freely connected to the cooling water outlet 41 includes a collecting member 43,
It is connected to the supply tank 20 via a recovery pipe 45 having a third pump 44, etc. Next, a method of supplying cooling water to the internal combustion engine 39 in the above embodiment will be explained. Figure 2 shows that the diluted antifreeze liquid 18 in the sub tank 7 is supplied to the third supply pipe 2.
The diluted antifreeze solution 18 in the supply tank 20 is shown being supplied to the supply tank 20 by gravity flow through the supply tank 2, and the diluted antifreeze solution 18 in the supply tank 20 is being used in a test equipment measurement. In this state, when the liquid level in the sub tank 7 falls and is detected by the low water level detector 17 as shown in FIG. This causes the third on-off valve 21 to close and cut off the third supply pipe 22. At the same time or immediately after this, the low water level detector 1
7 issues an opening instruction 17b to the first on-off valve 9, and also issues an operation instruction 17c to the first pump 8, whereby the high concentration antifreeze 2 in the main tank 1 is transferred to the secondary tank via the first supply pipe 10. It is supplied to tank 7. As a result, the liquid level in the sub tank 7 rises, and when detected by the initial water level detector 16 as shown in FIG. At the same time, a stop instruction 16b is issued to the first pump 8, and the first supply pipe 1
0 is shut off, and the supply of a predetermined amount of high concentration antifreeze 2 to the sub tank 7 is completed. At the same time or immediately after this, an opening instruction 16c is issued from the initial water level detector 16 to the second on-off valve 11, and the dilution water 13 is thereby supplied to the auxiliary tank 7 via the second supply pipe 12. As a result, the liquid level in the sub tank 7 rises, and as shown in FIG.
5, the second W is detected from this mixing water level detector 15.
A closing instruction 15a is issued to the closing valve 11, and the second supply pipe 1
2 is shut off, and the supply of a predetermined amount of dilution water 13 to the sub tank 7 is completed. The high concentration antifreeze 2 and the diluted water 13, each supplied in a predetermined amount, are mixed in the sub tank 7, thereby creating the diluted antifreeze 18 with a predetermined concentration. This is matched with the concentration of diluted antifreeze to be added. Even during the above-mentioned work, the diluted antifreeze liquid 18 in the supply tank 20 is being used by the test equipment. That is, the diluted antifreeze liquid 18 whose temperature has been adjusted by the temperature adjustment device 30 is taken out via the diluted antifreeze liquid supply pipe 35 by operation of the second pump 36, and then transferred to the distribution pipe 37.
The cooling water is supplied to the cooling water population 4Q through the cooling water and used for cooling the internal combustion engine 39. And diluted antifreeze M18 has cooling water output 04
1 to the collecting member 43 via the discharge pipe 42, and then recovered to the supply tank 20 via the recovery pipe 45. After completing the intended tests on the internal combustion engine 39, the fourth
The supply is cut off by closing the on-off valve 38, and the diluted antifreeze liquid 18 in the internal combustion engine controller 39 is removed while keeping the amount of residual water constant. By using the diluted antifreeze liquid 18 in this manner, the amount of the antifreeze liquid 18 is gradually reduced at least in proportion to the amount of residual water, and therefore the liquid level in the supply tank 20 is gradually lowered.
When the receiving water level detector 24 detects the water level as shown in FIG. 6, an opening instruction 24a is issued from the receiving water level detector 24 to the third on-off valve 21.
The diluted antifreeze liquid 18 inside is replenished (supplied) to the supply tank 20 via the third supply pipe 22, and the state returns to the state shown in FIG. For example, as shown in FIG. 4, when the dilution water 13 is being supplied and the mixing water level detector 15 is out of order, the liquid level in the auxiliary tank 7 rises further above the detection level.
When this rising liquid level is detected by the abnormally high water level detector 14 as shown by the solid line in FIG. 7, an abnormality instruction 14a is issued from the abnormally high water level detector 14 and the system shifts to an emergency stop. In addition, as shown by the imaginary line in Fig. 7, the supply tank 20
A similar situation may occur in IllI, and if it is detected by the abnormally high water level detector 23, the abnormally high water level detector 23 will issue a closing instruction 23a to the third on-off valve 21, or issue an alarm. Instruction 23b may be issued. Furthermore, when the abnormally low water level detector 25 detects this, the abnormally low water level detector 25 issues a stop instruction 25a to the second pump 36, and also issues an alarm instruction 25b. Effects of the Invention According to the present invention described in #Itc above, a diluted antifreeze having a desired concentration can be created and stored by mixing the high concentration antifreeze and dilution water that are supplied in fixed quantities in the sub tank. The diluted antifreeze can then be transferred from the auxiliary tank to the supply tank according to the demand instructions from the supply tank, and can be supplied as cooling water to the internal combustion engine being operated for the #A test. After conducting the intended tests, the diluted antifreeze is removed from the internal combustion engine while keeping the amount of residual water constant, but since all of the remaining water is diluted antifreeze, rust may occur in the internal combustion engine when stocked. can be prevented.
By matching the concentration of the diluted antifreeze used for cooling with the concentration of the diluted antifreeze added during the assembly process or after assembly, the diluted antifreeze used during the assembly process or after assembly will be used for internal combustion. Irrespective of the variation in the amount of residual water in mrIA, it is possible to perform suitable injection simply by adding more water.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, with FIG. 1 being an explanatory diagram of the overall arrangement, and FIGS. 2 to 7 being explanatory diagrams of the operation.

Claims (1)

[Claims] 1. A main tank for high concentration antifreeze and a 1st tank in this main tank.
Connected via an on-off valve and connected to a second dilution water supply device.
It has a sub-tank connected via an on-off valve, and a diluted antifreeze supply tank connected to this sub-tank via a third on-off valve, and the diluted antifreeze is discharged from the sub-tank side to the test internal combustion engine side. According to the instruction, one of the first on-off valve or the second on-off valve is opened to supply a predetermined amount of either the high concentration antifreeze solution or dilution water, and then the high concentration antifreeze solution is supplied by closing one valve and opening the other valve. A predetermined amount of diluted antifreeze and diluted water are supplied to create a predetermined concentration of diluted antifreeze in this subtank, and the third on-off valve is opened according to instructions from the supply tank that discharged the diluted antifreeze. A method for supplying cooling water to a test internal combustion engine, characterized by transferring diluted antifreeze in a tank to a supply tank.