JPS588568Y2 - Vehicle preheater - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vehicle preheater that uses a combustion type engine cooling water preheater to preheat a vehicle engine and heat the interior of a vehicle.

A vehicle interior heating system that connects a vehicle engine, an engine cooling water preheater, and a hot water heater for vehicle interior heating makes it easier to start the engine by prewarming the cooling water with the engine cooling water preheater when the engine is started. Sometimes, the vehicle interior is heated by a hot water heater using engine cooling water warmed by the heat generated by the engine (in this case, the engine cooling water '+m machine is stopped).
If the coolant temperature drops even when the engine is running, the engine coolant preheater is used to raise the temperature. This improves the fuel savings of the engine coolant preheater, the heating effect in the vehicle interior, and the engine durability. In the conventional system, each device is connected as shown in FIG.

In other words, 1 is the main body of the engine cooling water preheater, the combustion motor,
It consists of a combustion chamber, heat exchanger, etc.

2 is an engine, 3 is a hot water heater for heating the vehicle interior, 3a is a hot water defroster, and the cooling fan is driven by a motor.

Reference numeral 4 denotes a water pump for circulating engine cooling water, which is generally directly connected to the combustion motor of the preheater 1.

5 is a water pump built into engine 2, 6 is a radiator, 7,
8 is a thermostat, and 9 is a hot water valve.

The cooling water heated in the heat exchange chamber of the engine cooling water preheater 1 is radiated by the hot water heater 3 to heat the vehicle interior, and then enters the engine 2. The cooling water passes through the engine and is pressurized by the water pump 4. It enters the heat exchange chamber again and is heated.

In this case, one motor can combine the preheater 1 and the water pump 4.
In those that drive the cooling water, the cooling water is heated by the heat exchange chamber or the engine 2, and when the temperature reaches a predetermined temperature or higher, for example, 80°C, the preheater 1 is activated by the thermostat 8 that detects the temperature of the cooling water.
Since the operation of the water pump 4 is stopped, the operation of the water pump 4 is also stopped by stopping the combustion motor.

Therefore, the pressure of the cooling water in the engine 2 decreases in the engine's built-in water pump 5 due to the water flow resistance in the water pump 4 and the heat exchange chamber, and the amount of circulating cooling water decreases. 3 heating performance deteriorates.

Because the heat exchange chamber is not heated, the result is that the cooling water, which has become high in temperature due to the cooling waste heat of the engine 2, is instead cooled in the heat exchange chamber.

In order to prevent this, if the preheater and pump are driven by one motor, the preheater 1 is
A bypass passage 10 is provided to bypass the engine, and an electromagnetic three-way valve 11 that is energized and controlled by a thermoswitch 8 is installed at a branch point of this bypass passage. It has already been proposed to flow the cooling water through the bypass passage 10 without passing through the preheater 1 to eliminate pressure loss in the preheater.

However, the hot water to the hot water heater is preferably 80°C and 15 tAnin or more, but if the hot water heaters are arranged in series, the flow loss is large. It is extremely impossible to send the above amount of hot water to the hot water heaters in the passenger compartment using the boiling water pump 5, even if a bypass passage is used. The flow rate decreases due to flow loss, and the heating effect decreases significantly.

Therefore, it is necessary to provide a cooling water circulation water pump 4 that can operate separately from the preheater 1.

In view of the above points, the present invention drives a water pump for engine cooling water circulation with a motor separate from the motor that drives the engine cooling water heater, and connects the discharge path of this pump to the motor that drives the engine cooling water heater. An electromagnetic three-way valve is installed at the branch point of these passages to connect the two roads, and a bypass passage that communicates with the outlet through the exchange chamber and the other directly connects to the outlet without passing through the heat exchange chamber, and a double water valve in the suction side passage of the pump. A side water temperature relay is provided, and these are housed in a single case together with the above-mentioned cooling water heater, and a separately provided electric control panel controls the engine cooling water heater and engine cooling water circulation within a predetermined temperature range. A control circuit is provided to operate a water pump, an electromagnetic three-way valve, a hot water heater for heating the vehicle interior, and a hot water defroster in a coordinated manner, so that all devices are automatically controlled.

In other words, this idea consists of (a) providing a bypass passage in the engine cooling water preheater because the cooling water passes through the heat exchange chamber even when the engine cooling water heater is not combusting, and (b) providing a bypass passage at the branch point of the bypass passage. Installing a solenoid 3-way valve, (C) Solenoid 3
The position of the two-way valve is between the circulation water pump and the engine cooling water heater, and (d) the engine cooling water heater, water pump, bypass passage, and electromagnetic three-way valve are housed in one case. (e) An automatic control mechanism is provided that satisfies the functions of the vehicle interior heating including the hot water heater and the engine cooling water heater, thus ensuring error-free operation.

Next, an embodiment of the present invention will be explained with reference to the drawings. In FIG. 2, 1 is the main body of the engine cooling water preheater, 2 is the engine, 3 is the hot water heater for heating the vehicle interior connected in series, and 3a is the hot water defroster 14. is a water pump for circulating engine cooling water, 5 is a water pump built into the engine, 6 is a radiator, 7 is a thermostat, 9 is a hot water valve, 10 is a bypass passage, 11 is an electromagnetic 3
12 to 15 are water temperature relays, 16 is a water temperature relay for overheating prevention, and the engine cooling water preheater body 1, cooling water circulation water pump 4, bypass passage 10, electromagnetic three-way valve 11, and water temperature relay are surrounded by chain lines. A vehicle preheater is made up of units 12 to 16.

Figure 3 shows the details of the above-mentioned vehicle preheater.
is the engine cooling water preheater body, 17 is the combustion motor, 18 is the fuel pump, 19 is the combustion blower, 20 is the fuel spreader, 21 is the glow plug, 22 is the combustion chamber, 23 is the heat exchange chamber, and the water pump 4 is a motor 24 different from the combustion motor 17
The discharge path is divided into two paths, one of which is 25.
One passes through the heat exchange chamber 23 and communicates with its outlet 26, while the other is a bypass passage 10 which directly communicates with the outlet 26, and an electromagnetic three-way valve 11 is provided at the branch point of these passages 10 and 250.

The water temperature relays 12 to 15 are installed between the water pump 4 and the hot water valve 9 in the suction side passage 27 of the water pump 4, and only the overheating prevention water temperature relay 16 is installed on the end wall of the heat exchange chamber 23. All of these are housed in a case 28.

When the hot water relays 12 to 15 are provided close to the engine in this manner, the hot water temperature of the engine can be accurately detected and operated, so that the hot water temperature of the engine can be kept constant.

In this case, if a water temperature relay is installed at the hot water outlet of the preheater 1 as in the conventional device of this kind, it is possible to accurately maintain the hot water temperature at the outlet and keep the hot water temperature constant to the hot water heater. Since the temperature cannot be detected, it becomes impossible to maintain a constant temperature of the engine's hot water.

In the above configuration, an engine cooling water preheater 1, a vehicle interior heating hot water heater 3, an engine cooling water circulation water pump 4, an electromagnetic 3
The operation timing of the direction valve 11 and the water temperature relays 12 to 16 has a sequence of operation depending on the temperature, and all functions of these are electrically operated by one control panel.

Figure 4 shows the control circuit, where E is the power supply, S is the heater main switch, S□ is the engine cooling water preheater 1 switch, and 11
24 is an electromagnetic three-way valve that communicates with the heat exchange chamber passage when the circuit is OFF and communicates with the bypass passage 10 when it is ON; 24 is the water pump 4;
drive motor, 29 is a side start operation indicator lamp that also serves as a power lamp, 30 is a resistor, 31 is a hot water heater affine motor, 121 is ON at 70℃ or below, and OFF at 80℃ or above.
The contact point of water temperature relay 12, 131, turns ON when the temperature rises by 40℃.
Contacts 14 of the water temperature relay 13 turn on at temperatures above 70°C.
Contact point 1 of the water temperature relay 14 that turns off at 60°C or less
5□ is the contact point of the water temperature relay 15, which turns OFF at temperatures above 80°C and OFF at below 7°C, and 16□.

Reference numeral 162 is a contact point of the overheat prevention water temperature relay 16 which turns off at 95° C. or higher, and 32 is a contact point of a room thermostat which turns on and off depending on the vehicle interior temperature.

In the above circuit, when the main switch S is turned on at low temperature, the power lamp 29 lights up and at the same time, the motor 24 of the water pump 4 starts rotating.

In this case, the electromagnetic three-way valve 11 is connected to the water temperature relay 15 in the operating circuit.
is in the OFF state at low temperature and is in communication with the heat exchange chamber, so engine cooling water circulates through the preheater.

In this state, when the switch S1 is turned on, the contacts 12□ of the water temperature relays 12 and 16 are turned on at low temperatures.

The engine cooling water preheater 1 is operated through 161, the motor 17 is rotated at the same time as the glow plug 21 is ignited, the fuel from the fuel pump 18 is sprayed in a mist form by the sprayer 20, and is ignited and burned by the glow plug 21. The combustion gases travel along the walls of the heat exchange chamber and are exhausted from the exhaust pipe.

In this way, the engine cooling water (hereinafter referred to as hot water) is heated, and when the temperature rises to 40'C, the water temperature relay 13tj:O
Since the resistance becomes N and the resistance side is short-circuited, the lamp 29 increases in brightness to indicate that the engine can be started.

The room thermostat closes its contact 32 when the temperature is below the set temperature, so when the hot water temperature reaches 60°C, the water temperature relay 1
4 turns on, the fan motor 31 rotates in the circuit passing through the contact 141°32 to heat the vehicle interior, and when the temperature of the hot water further rises to 80°C, the water temperature relay 1
2 is 0FFL, water temperature relay 15 is ON, so preheater 1
At the same time as the combustion of the solenoid valve 11 stops, the electromagnetic three-way valve 11 is switched to the bypass passage 10 side.

Therefore, from now on, the hot water is heated only by the heat generated by the engine 20, but when the hot water temperature falls below 70°C, the preheater 1 is activated again, and at the same time, the electromagnetic three-way valve 11 is also switched to the heat exchange chamber side.

If the hot water temperature reaches 95 degrees Celsius or higher due to the operation of the preheater 1, the overheating prevention water temperature relay 16 will be turned off. 11 to the heat exchange chamber side, and prevents overheating thereafter.

As mentioned above, the present invention is such that the engine cooling water circulation water pump is directly connected and driven to a motor separate from the combustion motor, and one side of the water pump's discharge passage is connected to the outlet through the heat exchange chamber, and the other side is directly connected to the outlet of the water pump. As a bypass passage leading to the outlet of the heat exchange chamber, an electromagnetic three-way valve for switching both roads is installed at the branch point of these passages, and a water temperature relay is installed on the suction side of the water pump, and these are installed together with the engine cooling water preheater in one case. accommodate,
A separate electric control panel is configured to automatically control all equipment including the vehicle interior heating hot water heater, engine cooling water preheater, engine cooling water circulation water pump, electromagnetic 3-way valve, vehicle interior heating. The fan motor, etc. of the hot water heater can be operated in conjunction with each other automatically, and the hot water temperature required for operation can be reliably detected, allowing for error-free operation. It also prevents hot water pressure loss, provides a sufficient amount of water to supply the desired temperature to the hot water heater, and since all equipment is integrated into the housing, it can be easily installed on the vehicle, making it economically superior. It has many excellent effects, such as:

[Brief explanation of the drawing]

Fig. 1 is a connection diagram of a vehicle interior heating system using a conventional engine cooling water preheater, Fig. 2 is a connection diagram of the vehicle preheater of the present invention, Fig. 3 is a partially cutaway side view of the same preheater, and Fig. 4 The figure is a control circuit diagram same as above. 1...Vehicle engine cooling water preheater, 2...
・Engine, 3...Hot water heater, 4...Water pump, 10...Nokui pass passage, 11...
... Solenoid 3-way valve, 12-15 ... Water temperature relay, 17 ... Combustion motor, 18 ... Fuel pump, 19 ... Combustion Blower, 20...
...Fuel spreader, 22... Combustion chamber, 23.
... Heat exchange chamber, 24 ... Water pump motor, 25 ... Passage leading to the heat exchange room, 26 ...
... Outlet, 27 ... Pump suction side passage, 2
8... Case.

Claims (1)

[Scope of utility model registration request] Engine cooling water is heated by a combustion machine in which a combustion motor, a fuel pump, a combustion blower, and a fuel spreader are arranged on the same axis, and a combustion chamber and a heat exchange chamber are provided on the extension of the axis. In the engine cooling water preheater for a vehicle, the water pump circulates through the engine and the hot water heater to preheat the engine and heat the vehicle interior, and stops the operation of the combustor when the cooling water exceeds a predetermined temperature. is directly connected to a motor other than the combustion motor, and the discharge passage of this water pump is connected on one side to the outlet thereof through the heat exchange chamber, and on the other side is a bypass passage leading directly to the outlet of the heat exchanger chamber. An electromagnetic three-way valve for switching between both roads at the branch point and a plurality of water temperature relays in the suction side passage of the water pump are provided, and these are housed together with the combustion machine in one case, and an electric control panel is provided separately. A vehicle characterized in that a control circuit is provided for operating an engine cooling water preheater, a hot water heater for heating the vehicle interior, a water pump for engine cooling water circulation, an electromagnetic three-way valve, etc. in a coordinated manner within a predetermined temperature range. Preheater for use.