JP2016147214A - Cooling auxiliary apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling auxiliary apparatus capable of effectively suppressing pressure loss of the cooling system during engine low-speed rotation while effectively maintaining cooling auxiliary performance during engine high-speed rotation.SOLUTION: A cooling auxiliary apparatus comprises a cylindrical gas-liquid separator body 21, provided in a cooling water circulation path to be capable of separating a mixed gas by making internally introduced cooling water generate swirl flows, a gas suck-out tube 17 a suction outlet 19 of which is inserted into the gas-liquid separator body 21 and which sucks out a gas separated in the gas-liquid separator body 21, and a suction tube forward and rearward movement device 22, which moves the gas suck-out tube 17 forward and rearward, where the suction tube forward and rearward movement device 22 adjusts the height of the suction outlet 19 of the gas suck-out tube 17 by making the same face a gas liquid separation region B the height position of which varies with flow speeds of cooling water in the gas-liquid separator body 21.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a cooling auxiliary device, and more particularly to a cooling auxiliary device of a cooling system that circulates cooling water in a cooling water circulation path by a pump driven by engine power.

  Conventionally, a gas-liquid separator (hereinafter referred to as a swirl pot) that separates gas mixed in cooling water due to partial boiling generated at the time of high output of the engine or aeration generated at the time of high output of the cooling water pump is known. (For example, see Patent Documents 1 and 2).

JP 2006-177260 A JP 2006-336575 A

  The swirl pot is a device that separates the gas mixed in the cooling water by swirling flow at the time of high engine speed and high load operation. Therefore, if a swirl flow is generated in the cooling water even during low engine speed and low load operation, the pressure loss of the cooling system may be caused and the efficiency of the cooling water pump may be reduced, which may affect the fuel consumption. .

  It is an object of the present invention to provide cooling that can effectively suppress pressure loss of a cooling system during low engine speed and low load operation while effectively maintaining cooling assist performance during high engine speed and high load operation. It is to provide an auxiliary device.

  In order to achieve the above-mentioned object, the present invention provides a cooling auxiliary device for a cooling system in which cooling water is circulated in a cooling water circulation path by a pump driven by engine power, and is provided in the cooling water circulation path. A cylindrical gas-liquid separator main body capable of separating a gas mixed by generating a swirling flow in the introduced cooling water, and a gas-liquid separator in which a suction port is movably inserted into the gas-liquid separator main body. A gas suction pipe for sucking the gas separated in the main body, and a suction pipe advancing / retreating device for moving the gas suction pipe back and forth. The height of the suction port of the gas suction pipe is adjusted so as to face the gas separation region whose height position changes according to the flow velocity.

  The suction pipe advancing / retreating device includes a cylinder connected to a water jacket in the engine, a piston to which the gas suction pipe is fixed and moved forward and backward by pressure in the cylinder, and an urging force for biasing the piston to the backward side. It is preferable that the piston moves forward by pressure in the cylinder against the urging force of the urging member.

  The urging force of the urging member is preferably set based on a flow velocity pressure at which gas separation starts at the center of the cooling water swirling flow in the gas-liquid separator body.

  According to the cooling assistance device of the present invention, the pressure loss of the cooling system at the time of engine low rotation and low load operation is effectively suppressed while effectively maintaining the cooling assistance performance at the time of engine high rotation and high load operation. be able to.

It is a typical whole block diagram which shows the cooling water circulation path of the engine to which the cooling assistance apparatus which concerns on one Embodiment of this invention was applied. (A) is the schematic diagram which looked at the upper surface of the cooling auxiliary device of this embodiment, (b) is the schematic diagram seen from the side. In this embodiment, it is a schematic diagram explaining the state which raised the gas suction pipe of the cooling auxiliary device according to the gas separation area | region when the flow rate of cooling water is slow. In this embodiment, it is a schematic diagram explaining the state which lowered | hung the gas suction pipe of the cooling assistance apparatus according to the gas separation area | region when the flow rate of cooling water is quick.

  Hereinafter, based on an accompanying drawing, a cooling auxiliary device concerning one embodiment of the present invention is explained. The same parts are denoted by the same reference numerals, and their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  First, with reference to FIGS. 1-4, the structure of the cooling assistance device which concerns on one Embodiment of this invention is demonstrated. FIG. 1 is an overall configuration diagram showing a cooling water circulation path of an engine 10 to which a cooling assist device 20 according to the present embodiment is applied.

  In FIG. 1, reference numeral 11 is a water jacket formed in the engine 10, reference numeral 12 is a radiator, reference numeral 13 is an upper tank, reference numeral 14 is a cooling water pump driven by the power of the engine 10, and reference numeral 15 is an outlet of the water jacket 11. And a cooling water introduction pipe for connecting the cooling auxiliary device 20, reference numeral 16 is a cooling water outlet pipe for connecting the cooling auxiliary device 20 and the inlet of the radiator 12, and reference numeral 17 is a gas for connecting the cooling auxiliary device 20 and the upper tank 13. Reference numeral 18 denotes a cooling water downstream pipe connecting the outlet of the radiator 12 and the inlet of the water jacket 11 (or the cooling water pump 14).

  FIG. 2A is a schematic view of the cooling auxiliary device of the present embodiment as viewed from above, and FIG. 2B is a schematic view as viewed from side. As shown in FIG. 2, the cooling auxiliary device 20 includes a cylindrical swirl pot (gas-liquid separator main body) 21, a gas suction pipe 17 that sucks out the gas separated in the swirl pot 21, and a gas suction pipe 17. A suction pipe advancing / retreating device 22 that moves forward and backward is provided.

  The swirl pot 21 has a downstream end of the cooling water introduction pipe 15 connected to the upper cylindrical portion from the tangential direction, and an upstream end of the cooling water outlet pipe 16 connected to the lower cylindrical portion from the tangential direction. In addition, a suction port 19 at a lower end portion of the gas suction pipe 17 (shown only in FIG. 2B) is inserted and connected to the center of the upper surface of the swirl pot 21 so as to be movable back and forth. That is, the cooling water that has flowed into the swirl pot 21 from the cooling water introduction pipe 15 flows downward toward the cooling water outlet pipe 16 while turning along the inner peripheral surface of the swirl pot 21, and from the cooling water in the process. The separated gas is recovered from the gas suction pipe 17 to the upper tank 13 (shown only in FIG. 1).

  As shown in FIG. 2 (b), the suction pipe advance / retreat device 22 is moved forward and backward by the pressure in the cylinder 23 connected to the water jacket 11 in the engine 10 and the cylinder chamber 24 of the cylinder 23 (in this embodiment, A piston 25 that moves up and down), and a biasing member 26 that biases the piston 25 backward. A gas suction pipe 17 is inserted into and fixed to the piston 25.

  The piston 25 is moved up and down by the pressure in the cylinder chamber 24, and the gas suction pipe 17 is inserted and fixed to the piston 25, so that the gas suction pipe 17 moves up and down as the piston 25 moves up and down. Therefore, the gas suction pipe 17 is preferably a flexible pipe body such as a bellows pipe.

  A cooling water pressure introducing pipe 27 is connected to the cylinder chamber 24 of the cylinder 23. The tip of the coolant pressure introduction pipe 27 is connected to a portion of the water jacket 11 in the engine 10 that has higher pressure sensitivity on the downstream side than the coolant pump 14.

  The piston 25 moves forward (downward movement in this embodiment) by the pressure in the cylinder chamber 24 against the urging force of the urging member 26. As the biasing member 26 of the present embodiment, for example, an elastic member such as a set spring (compression coil spring) is employed, but is not limited to the illustrated elastic member. The urging force of the urging member 26 is preferably set based on the fluid pressure at which gas separation starts at the center of the cooling water swirl flow in the swirl pot 21.

  That is, when the flow velocity pressure of the cooling water pumped by the cooling water pump 14 is less than the urging force (resistance force) of the urging member 26, the piston 25 moves upward and the gas suction pipe 17 fixed to the piston 25. Also rises. Therefore, in the swirl pot 21, the suction port 19 of the gas suction pipe 17 is adjusted to a high position (see FIG. 3).

  On the other hand, when the flow velocity pressure of the cooling water exceeds the urging force (drag) of the urging member 26, the piston 25 moves downward and the gas suction pipe 17 fixed to the piston 25 also descends. Therefore, in the swirl pot 21, the suction port 19 of the gas suction pipe 17 is adjusted to a low position (see FIG. 4).

  Next, with reference to FIG. 3 and FIG. 4, the effect of the cooling assistance apparatus 20 which concerns on this embodiment is demonstrated. FIG. 3 is a schematic diagram for explaining a state in which the gas suction pipe of the cooling auxiliary device is raised in accordance with the gas separation region when the flow rate of the cooling water is slow in the present embodiment. FIG. 4 is a schematic diagram for explaining a state in which the gas suction pipe of the cooling auxiliary device is lowered according to the gas separation region when the flow rate of the cooling water is fast in the present embodiment.

  As shown in FIG. 3, when the flow rate of the cooling water in the swirl pot 21 is slow, the vortex inner diameter S is formed at a high position in the swirl pot 21. Therefore, the gas separation region B is generated at the upper portion of the vortex inner diameter S at a high position in the swirl pot 21.

  When the flow rate of the cooling water in the swirl pot 21 is slow, the flow rate pressure of the water jacket 11 of the engine 10 should be small. Therefore, when the flow velocity pressure of the cooling water is less than the urging force (drag) of the urging member 26, the piston 25 moves up and the gas suction pipe 17 fixed to the piston 25 also rises, and the swirl pot 21 Inside, the suction port 19 of the gas suction pipe 17 is adjusted to a high position.

  On the other hand, as shown in FIG. 4, when the flow rate of the cooling water in the swirl pot 21 is high, the vortex inner diameter S is formed at a low position in the swirl pot 21. Therefore, the gas separation region B is generated at the upper portion of the vortex inner diameter S at a low position in the swirl pot 21.

  When the flow rate of the cooling water in the swirl pot 21 is fast, the flow rate pressure of the water jacket 11 of the engine 10 should be large. Therefore, when the flow velocity pressure of the cooling water exceeds the urging force (drag) of the urging member 26, the piston 25 moves downward and the gas suction pipe 17 fixed to the piston 25 descends, and the swirl pot 21 The suction port 19 of the gas suction pipe 17 is adjusted to a low position.

  When the flow velocity pressure of the cooling water is balanced with the urging force (drag) of the urging member 26, the piston 25 and the gas suction pipe 17 do not move and remain at the height position.

  As described above, according to the cooling assistance device 20 of the present embodiment, the cooling assistance performance at the time of high rotation / high load operation of the engine 10 is effectively maintained, and at the time of low rotation / low load operation of the engine 10. The pressure loss of the cooling system can be effectively suppressed.

  In addition, this invention is not limited to the above-mentioned embodiment, In the range which does not deviate from the meaning of this invention, it can change suitably and can implement.

  In the above-described embodiment, the suction pipe advance / retreat device 22 is configured by a cylinder device. However, the present invention is not limited to this, and the suction pipe advance / retreat device 22 may be configured by an electromagnetic solenoid, a hydraulic actuator, or the like. In this case, a drive instruction signal may be output from the electronic control unit (ECU) to the suction pipe advance / retreat device 22 based on sensor values of a cooling water flow rate sensor and an engine speed sensor (not shown). Further, the urging member 26 is not limited to a set spring (compression coil spring), and may be another type of elastic member such as a spring or rubber.

DESCRIPTION OF SYMBOLS 10 Engine 11 Water jacket 12 Radiator 13 Upper tank 14 Cooling water pump 15 Cooling water introduction piping 16 Cooling water extraction piping 17 Gas suction piping 18 Cooling water downstream piping 19 Outlet 20 Cooling auxiliary device 21 Swirl pot (gas-liquid separator main body)
22 Suction pipe advance / retreat device 23 Cylinder 24 Cylinder chamber 25 Piston 26 Biasing member

Claims (3)

A cooling auxiliary device of a cooling system for circulating cooling water in a cooling water circulation path by a pump driven by engine power,
A cylindrical gas-liquid separator main body provided in the cooling water circulation path and capable of separating the mixed gas by generating a swirling flow in the cooling water introduced inside,
A gas outlet pipe that is inserted into the gas-liquid separator main body so as to be movable forward and backward, and sucks out the gas separated in the gas-liquid separator main body;
A suction pipe advancing / retreating device for moving the gas suction pipe back and forth;
With
The suction pipe advancing / retreating device adjusts the height of the suction port of the gas suction pipe so as to face the gas separation region whose height position changes in accordance with the flow rate of cooling water in the gas-liquid separator body. A cooling auxiliary device characterized by that. The suction pipe advance / retreat apparatus is:
A cylinder connected to a water jacket in the engine;
The gas suction pipe is fixed, and a piston that moves forward and backward by the pressure in the cylinder;
A biasing member that biases the piston backward,
With
The cooling assist device according to claim 1, wherein the piston moves forward by pressure in the cylinder against a biasing force of the biasing member. The cooling auxiliary device according to claim 1 or 2, wherein the urging force of the urging member is set based on a flow velocity pressure at which gas separation starts at the center of the cooling water swirling flow in the gas-liquid separator main body.

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