JPS6346655Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention relates to a cooling water circulation system for automobiles, and it is a method for easily constructing a cooling water circulation circuit in automobiles in which a portion of the engine cooling water flows through the heater core. This is what I did.

(Prior Art) Automobiles are equipped with heater devices for the purpose of keeping warm in cold weather. This heater device generally consists of a heater core through which engine cooling water heated by engine cooling flows, and a fan located at the back of the heater core that guides air through the heater core. A flow control valve is connected to a circulation circuit that guides the engine coolant to the heater core to adjust the amount of coolant flowing through the heater core and adjust the temperature.

On the other hand, a water pump and a thermostat valve are connected to the main cooling circuit that cools the engine. The other circuit is opened to allow flow back to the water pump. When the temperature of the cooling water is below a certain value, the thermostat valve does not open, and the cooling water flows through a separately provided bypass return circuit.

When considering the amount of heat dissipated by the radiator and heater core, the amount Q of heat dissipated can be expressed as Q=q×A×ΔT (1). However, in the above formula, q: flow rate of hot water (cooling water) ΔT: difference between the temperature of the air passing through the fins and the temperature of the hot water (average value) A: constant. In addition, in this equation, the flow rate q of hot water is
It will be determined by the capacity of the water pump and the resistance of the entire flow path. Unnecessarily increasing the capacity of the water pump would be disadvantageous in terms of engine room space, weight, engine load, and fuel efficiency.

(Problems to be Solved by the Invention) As described above, the conventional cooling water circulation device requires a bypass return circuit, which poses a problem in that the cooling water circulation circuit becomes more complicated. The present invention was developed with the aim of solving this problem, and aims at how to effectively utilize the limited water pump capacity.

(Means for Solving the Problems) As a means for solving the above-mentioned problems, the present invention provides an automobile in which a part of the engine cooling water is made to flow through the heater core. The air mixer is connected in parallel to the thermostatic valve, and an air mix mechanism for adjusting the amount of air passing through the heater core is provided in the air circuit that allows air to flow through the heater core.

(Function) With this configuration, the pipe circuit connected to the heater core can reduce the low temperature of the cooling water in a car equipped with a water pump with limited capacity, without providing a bypass return circuit that was previously required. This means that at times the heat dissipation of the heater core can be maximized, and at high temperatures the heat dissipation of the radiator can be maximized.

(Example) Hereinafter, an example of the present invention will be explained with reference to the drawings. First, in Fig. 1, 1 is an engine,
2 is the cylinder head (intake side). 3
is a water pump, which is rotationally driven by a belt 8 stretched between a pulley 5 attached to the drive shaft 4 and a pulley 7 attached to the crankshaft 6 of the engine 1. be.
The water pump 3 connects a thermostatic valve 9 and a radiator 10 in series through a pipe 11 to form a main cooling circuit in which cooling water for the engine 1 flows in the direction shown by the arrow. A fan 13 rotatably driven by a motor 12 is provided at the back of the radiator 10 for cooling.

Pipe 1 is connected in parallel to thermostatic valve 9.
A heater core 15 is connected by 4. Due to this circuit, part of the engine cooling water flows through the heater core 15 regardless of whether the thermostat valve 9 is opened or closed. What is shown in FIG. 2 is a heater device that serves as an air circuit for flowing air to the heater core 15 shown in FIG. This heater device includes a heater core 15 and a fan 17 housed inside a housing 16, an outside air intake port 18, and an inside air intake port 1.
9, a ventilator connection port 20, a hot air outlet 21, and a defogger connection port 22 are provided.

These are opened and closed or the air volume is adjusted by dampers 23, 24, 25, and 26 provided inside the housing 16.
Among these dampers, the damper 25 provided near the heater core 15 functions as an air mix mechanism for adjusting the temperature of the air discharged from the hot air outlet 21 and the defogger connection port 22. That is, depending on the position of the damper 25, the amount of air passing through the heater core 15 can be changed. This device does not have the conventional bypass return circuit, and the circuit of the pipe 14 to which the heater core 15 is connected functions instead. The temperature of the hot air is adjusted by operating the damper 25 as an air mixing mechanism.

Next, the operation of the above device will be explained separately when the engine cooling water is at a low temperature and when the engine cooling water is at a high temperature.

When the coolant temperature is low (approximately 90°C or less), the coolant flow path is water pump 3 → engine 1 → cylinder head 2 → heater core 15 → radiator 10 → water pump 3, and the flow rate at that time is Since the flow path is long and all of the flow passes through the heater core 15, the resistance as a whole is large, so the resistance is small. As for the flow rate of the heater core 15, since the entire amount of cooling water passes through it, the point where ΔT is small in the above equation (1) is covered by the size of q.

When the temperature of the cooling water is high (approximately 90°C or higher), the thermostat valve 9 opens at approximately 90°C, so the water pump 3 is used as the cooling water flow path.
→ engine 1 → cylinder head 2 → radiator 10 (heater core 15 is bypassed) → water pump 3, and the flow rate at this time is increased because the bypass flow path is opened, and the flow resistance as a whole decreases. In the above equation (1), as q increases, the amount of heat dissipated from the radiator 10 increases. The flow rate of the heater core 15 decreases because the resistance of the heater core 15 is greater than that of the bypass flow path, but this does not mean that the flow stops completely. That is, since there is a flow path on the heater core 15 side and there is resistance in the bypass flow path, the flow will also flow on the heater core 15 side. Therefore, although q decreases in the above equation (1), since ΔT has become sufficiently large, there is no problem with heater performance.

The device according to the present invention works as described above, so that in a car equipped with a water pump 3 of limited capacity, the heat dissipation of the heater core 15 is maximized when the cooling water is low, and the amount of heat dissipated from the radiator 10 is reduced when the coolant is high. This means that it can be set to the maximum value.

(Effect of the invention) Since the present invention is an automobile cooling water circulation system configured as explained above, in an automobile equipped with a water pump of limited capacity, when the cooling water is at a low temperature, the amount of heat dissipated from the heater core is This means that the heat dissipation of the radiator can be maximized at high temperatures. In addition, the engine cooling water circulation circuit is simplified, making the overall size smaller and smaller.
It also has the advantage of being lighter and cheaper.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an embodiment of the present invention, and FIG. 2 is a system diagram schematically showing a heater device using the heater core shown in FIG. 1...Engine, 3...Water pump, 9...
...Thermostat valve, 10...Radiator,
11, 14...Pipe, 15...Heater core, 1
6... Heater device, 25... Damper.

Claims (1)

[Scope of utility model registration request] In an automobile in which a portion of the engine cooling water is made to flow through the heater core, the heater core is connected in parallel to a thermostat valve provided in the main cooling circuit, and the heater core is connected in parallel to a thermostat valve provided in the main cooling circuit. A cooling water circulation system for an automobile, characterized in that it is equipped with an air mix mechanism that adjusts the amount of air passing through the cooling water circulation system.