JPH0247225Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cooling water supply/discharge device for an internal combustion engine testing device.

Conventionally, internal combustion engine testing involves connecting fuel supply hoses, cooling water hoses, exhaust gas ducts, etc. to the internal combustion engine installed at the test location, and interlocking the main shaft of the internal combustion engine with one end of the operating shaft of the test equipment. ,
Then, a drive device (such as a DC motor) for starting the internal combustion engine is connected to the other end of the operating shaft via a clutch, and after starting rotation (motoring) of the main shaft of the internal combustion engine, the drive device starts the internal combustion engine. This was done by having them drive. During such operation, cooling water flows into the internal combustion engine to perform the desired cooling. After the internal combustion engine is stopped due to the end of the test, the cooling water remaining in the internal combustion engine is removed.
By the way, in the conventional method of removal, the water was removed as a natural outflow from the drain hole, and according to this method, the removal time was long (about 5 minutes), and as a result, the test time was increased. In addition, the coolant water that has been drained is discharged, and discarding the coolant water whose temperature has been controlled to suit the test would interfere with energy conservation. Furthermore, since it is a natural outflow, it cannot be completely removed, and there is a risk that the internal combustion engine will rust due to adhering moisture.

The purpose of the present invention is to provide a cooling water supply/drainage device for an internal combustion engine testing device that can reliably remove cooling water from an internal combustion engine in a short time and can reuse the removed cooling water. be.

In order to achieve the above object, the cooling water supply/discharge device in the internal combustion engine testing apparatus of the present invention includes a discharge pump and a first switching valve in the first path connecting the cooling water tank and the cooling water inlet of the internal combustion engine. and a second switching valve is arranged in a second path connecting the cooling water tank and the cooling water outlet of the internal combustion engine, and when the first switching valve shuts off the first path, the first switching valve A cooling water extraction path is provided that communicates the cooling water inlet and the cooling water tank through a valve, and communicates with the cooling water outlet through the second switching valve when the first path is shut off by the second switching valve. An air introduction path is provided, and at least one of the cooling water extraction path and the air introduction path is provided with a pressure feeding device whose pumping direction is directed toward the cooling water tank.

According to the configuration of the present invention, the following effects can be expected. That is, during operation, the first switching valve is switched to the first path communication state, and the second switching valve is switched to the first path communication state.
By switching the switching valve to the second path communication state and operating the discharge pump, the cooling water in the cooling water tank can be flowed to the internal combustion engine to perform the desired cooling, and the used cooling water can be The water can be returned to the cooling water tank and reused. In addition, after the operation is stopped, the first switching valve is switched to the first path blocking state, and the second switching valve is switched to the second path blocking state, so that the water can be removed via the first switching valve and the cooling water withdrawal path. The cooling water inlet and the cooling water tank can communicate with each other, and the cooling water outlet and the air introduction path can communicate with each other via the second switching valve. Therefore, by operating the pressure feeding device in this state, the inside of the internal combustion engine is pressurized or under negative pressure, thereby transferring the atmosphere to the air introduction path, the second switching valve, the cooling water outlet, the internal combustion engine, The cooling water can be forced to flow to the cooling water inlet, the first switching valve, the cooling water extraction path, and the cooling water tank, and the cooling water in the internal combustion engine can be removed along with this atmospheric flow. As a result, cooling water can be removed from the internal combustion engine reliably in a short period of time, and by shortening the removal time, testing time can be shortened, and by ensuring the removal, rust can be prevented. can. Furthermore, since the removed cooling water is returned to the cooling water tank, the temperature-controlled cooling water can be reused, making it possible to save energy. Furthermore, since all of the cooling water is reused, expensive anti-corrosion liquid, antifreeze liquid, etc. can be mixed into the cooling water in advance.

An embodiment of the present invention will be described below based on the drawings. Reference numeral 1 denotes an internal combustion engine, which has a cooling water inlet 2 and a cooling water outlet 3. 4 is a cooling water tank in which temperature-controlled cooling water 5 is stored. 6 is a first port connecting the cooling water inlet 2 and the cooling water tank 4;
A discharge pump 7 located on the side of the cooling water tank 4 and a first switching valve 8 located on the side of the internal combustion engine 1 are disposed in the path. A second path 9 connects the cooling water outlet 3 and the cooling water tank 4, and a second switching valve 10 is disposed in this path. Reference numeral 11 denotes a cooling water extraction path, which communicates the cooling water inlet 2 with the cooling water tank 4 via the first switching valve 8 when the first path 6 is shut off by the first switching valve 8. 1
2 is an air introduction path, and the second switching valve 10
When the path 9 is cut off, it communicates with the cooling water outlet 3 via the second switching valve 10. At least one of the cooling water extraction route 11 and the air introduction route 12,
A pressure feeding device is provided with the pressure feeding direction directed toward the cooling tank 4 side. That is, a blower 13, which is an example of a pressure feeding device, is disposed in the cooling water extraction path 11, and an air pipe 15, which is an example of a pressure feeding device, is connected to the air introduction path 12 via a third switching valve 14. has been done. In addition, blower 13 and air piping 1
5 may be omitted. Said first switching valve 8
An on-off valve 16 is provided in the cooling water extraction path 11 between the blower 13 and the on-off valve 1.
A collection path 17 is connected to the cooling water extraction path 11 between the cooling water extraction path 11 and the blower 13 . A plurality of cooling water extraction channels 11 each having an on-off valve 16 and the like communicate with this collective channel 17, so that one blower 13 is configured to support a plurality of internal combustion engines 1. However, when one blower 13 is used for one internal combustion engine 1, the on-off valve 16 and the like are omitted. In addition, each route 6, 9, 11, 1
2 and 17 are formed by, for example, hoses.

The action will be explained below.

During operation, as shown in FIG. 1, the first switching valve 8 is switched to a state in which the first path 6 communicates, and the second switching valve 10 is switched to a state in which the second path 9 is communicated, and then the discharge pump is switched to a state in which the second path 9 communicates. Activate 7. Then, the cooling water 5 in the cooling water tank 4 is transferred to the first path 6, the cooling water inlet 2, the internal combustion engine 1, the cooling water outlet 3,
The water flows through the second path 9 to perform the desired cooling of the internal combustion engine 1, and is returned to the cooling water tank 4 for reuse. Further, after the operation is stopped, as shown in FIG.
By switching route 9 to a blocked state,
The cooling water inlet 2 and the cooling water tank 4 can be communicated via the first switching valve 8 and the cooling water extraction route 11, and the cooling water outlet 3 and the air introduction route 12 can be communicated via the second switching valve 10. It is possible. Therefore, in this state, for example, the blower 13 is operated to stop the internal combustion engine 1.
By creating a negative pressure state inside, the atmosphere, air introduction path 12, second switching valve 10, cooling water outlet 3, internal combustion engine 1, cooling water inlet 2, first switching valve 8, cooling water extraction path 11 , the cooling water 5 in the internal combustion engine 1 can be forcibly flowed into the cooling water tank 4, carried by the atmospheric flow at that time, and can be completely removed from the internal combustion engine 1, and can be recovered in the cooling water tank 4.

Note that after one internal combustion engine 1 is removed, the corresponding on-off valve 16 is closed, but at this time the blower 13 is activated and can act on the other internal combustion engine 1.

Furthermore, by operating the air pipe 15, the inside of the internal combustion engine 1 can be pressurized and the cooling water can be removed.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a system diagram during operation, and FIG. 2 is a system diagram when cooling water is removed. 1... Internal combustion engine, 2... Cooling water inlet, 3... Cooling water outlet, 4... Cooling water tank, 5... Cooling water,
6...first path, 7...discharge pump, 8...first
Switching valve, 9... second path, 10... second switching valve,
11...Cooling water extraction route, 12...Air introduction route, 13...Blower (pressure feeding device), 14...Third switching valve, 15...Air piping (pressure feeding device), 1
6...Opening/closing valve, 17...Collection route.

Claims (1)

[Scope of utility model registration request] A discharge pump and a first switching valve are disposed in a first path connecting the cooling water tank and the cooling water inlet of the internal combustion engine, and a second path connecting the cooling water tank and the cooling water outlet of the internal combustion engine. A second switching valve is disposed in the route, and a cooling water extraction route is provided that communicates the cooling water inlet and the cooling water tank via the first switching valve when the first route is shut off by the first switching valve. , when the second path is shut off by the second switching valve, an air introduction path communicating with the cooling water outlet via the second switching valve is provided, and the air is forced into at least one of the cooling water extraction path and the air introduction path. A cooling water supply/discharge device for an internal combustion engine testing device, characterized in that a pressure feeding device is provided with the direction facing the cooling water tank side.