JPS62214010A - Heating device for vehicle - Google Patents

Abstract

PURPOSE:To reduce a feed amount to a heat exchanger with simple constitution at high engine speed by providing a flow control valve at the upstream of the heat exchanger in a circulation flow passage for a warm water type heating device so as to change a flow area inversely with a warm water flow amount. CONSTITUTION:When a heater cock 11 has been opened, warm water flows into a heat exchanger 1 from an engine 10 through a pump 'P' via a feed passage 8, thereby effectuating heating. In this case, when the number of revolutions of the engine 10 is small and a warm water flow quantity is small, the valve body 21 of a flow control valve 20 comes down due to the own weight thereof and gets in contact with a lower valve seat 30. Therefore, as warm water flows to an outlet port 'B' from an inlet port 'A' via a notch 32 and a valve chamber 23, a flow passage area is large enough to increase the inflow of warm water to the heat exchanger 1. On the contrary, when the number of revolutions of the engine 10 is large and a feed quantity increases, the valve body 21 becomes afloat, thereby reducing the flow passage area and the flow quantity. According to the aforesaid constitution, a heat exchange amount can be stabilized with simple constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vehicle heating system, and particularly to a hot water type heating system.

(Prior Art) Conventionally, there are heating devices of this type, such as those shown in Figures 6 and 7 (Automotive Engineering Complete Book Vol. (see page 155).

That is, 100 is a heat exchanger, which is connected to the engine 103 via an inlet tube 101 for hot water supply and an outlet tube 102 for return, and is connected to the engine 103 to cool the inside of the engine 103 and transfer the heated hot water to the heat exchanger 100.
It is designed to circulate inside the body. A heater cock 104 that opens and closes the waterway of the inlet tube 101 is arranged near the inlet port of the heat exchanger 100 of the inlet tube 101 . The hot water is supplied to the heat exchanger 100 by a water pump 1 driven by the rotation of the engine 103.
This is done by 05. Therefore, the hot water supply pressure increases when the engine 1030 rotation speed is high, and an excessive load is placed on the heat exchanger 100. Therefore, conventionally, the inlet tube 101 and the outlet tube 10
2 is provided to bypass the heat exchanger 100, and a bypass valve 107 that opens when the differential pressure between the upstream side and the downstream side of the heat exchanger 100 exceeds a predetermined pressure is provided in the bypass path 106. Ta. That is, when the engine speed increases and the hot water supply pressure becomes excessive, the bypass valve 107 is opened to allow a portion of the hot water to flow into the bypass passage 106 to reduce the water pressure applied to the heat exchanger 100.
Heat exchanger 1o.

was protecting. In addition, there are 108 companies in the figure.

(Problem to be Solved by the Invention) However, in the case of such a conventional example, when the heater cock 104 is closed, the bypass valve 107 is always open due to the water pressure of the hot water. Even if you are not using the 44757, hot water is circulated through the passage 106. To that end, each tube 10
There was a drawback that deterioration of piping systems such as No. 1 and 102 was accelerated. Furthermore, when the heater cock 104 is closed, back pressure is applied to the heat exchanger 100 via the Mobypass passage 1i1s 106, and it is necessary to increase the strength of the heat exchanger 1000. Furthermore, there is a drawback that the distribution piping system in which the bypass passage 106 is provided becomes complicated. It is an object of the present invention to provide a heating device that can reduce the supply flow rate to a heat exchanger when the engine is running at high speed with a simple configuration without providing a heating device.

(Means for solving problems) In order to achieve the above object, the present invention has the following features.

In a vehicle heating system that circulates hot water in the ennon to a heat exchanger in the heater section via a circulation waterway, when the hot water supply water cover increases near the water intake of the circulation waterway of the engine, the flow path area is reduced. , which is equipped with a flow control valve that expands the flow path area when the amount of water supplied decreases.

(Function) In the present invention, when the engine speed increases and the amount of hot water supplied from the engine increases, the flow area is narrowed by the flow rate control valve and the flow path resistance increases.
The flow rate of hot water sent to the heat exchanger is restricted and the applied water pressure is reduced. When the rotational speed of the Mayu engine decreases and the amount of water supplied decreases, the flow area is increased by the flow control valve, the flow path resistance is reduced, and the flow rate of hot water sent to the heat exchanger is increased. Therefore, the hot water flowing through the circulation channel fr
t and the amount are not affected much by changes in engine speed, and a proper flow rate is always maintained.

(Example) The present invention will be described below based on an illustrated example. In FIG. 4 showing a circuit of a waterway system of a vehicle heating device according to an embodiment of the present invention, 1 is a heat exchanger, and this heat exchanger 1 is arranged in a heater section 20 and a ventilation passage 3. There is. In the ventilation passage 3, a blower 4 is installed on the upstream side of the heat exchanger 1, and a switching door 6 installed in the air inlet 5 selects outside air or inside air. The heated air is blown, heat exchanged and heated by the heat exchanger 1, and hot air is blown into the single room from each blowout lower on the downstream side of the heat exchanger 1.

On the other hand, the heat exchanger 1 is connected to a water channel of the engine cooling system via a supply channel 8 and a return channel 9 for hot water supply, and a circulation channel is formed by the supply channel 8 and the return channel 9. has been done. Inlet of heat exchanger 1 of supply channel 8
A heater cock 11 for controlling the opening and closing of the supply flow 188 is disposed nearby, as in the conventional example. On the other hand, if the supply flow path 8 is near the water intake of the engine 1o, and the engine rotation speed increases and the supply amount of hot water sent out from the Ennon side increases, the flow path area will be affected, and if the supply water amount decreases, the flow path area will increase. A flow rate control 9F20 is provided to expand the area.

FIGS. 1 to 3 show an embodiment of the above-mentioned N-type control valve. That is, 21 is a spherical valve body, which is disposed in a valve chamber 23 provided in a cylindrical housing 22 so as to be movable in the vertical direction. The housing 22 is arranged with its center axis facing in the vertical direction, and the openings 24, 2511m at both the upper and lower ends are reduced in diameter to a small diameter, and cylindrical connecting pipes are inserted into the small diameter openings s24 and 25, respectively. 26
．． 27 is inserted and fixed. The lower connection Ir 27 is connected to the upstream pipe to form the inflow boat A, and the upper connection pipe 26 is connected to the downstream pipe to form the outflow boat B. Large diameter portion 221 of the housing 22
The inside thereof is a hollow valve chamber 23, in which the valve body 21 is housed. On the other hand, the valve chamber 23 of the connecting pipe 26°27
The side ends project into the valve chamber 23 and form an upper valve seat 29 and a lower valve seat 30, respectively. Among these, a small diameter hole 31 that communicates the outflow port B of the peripheral wall 29alC11 of the upper part 9ffi29 and the valve chamber 23 is bored, and the valve body 21 comes into contact with the upper valve seat 29 and the valve seat opening 29b is closed. The hot water in the valve chamber 23 can flow out to the outflow port B through the hole 31. Further, the lower valve seat 30 has a plurality of notches 32 in the circumferential direction. ... is provided, so that even if the valve body 21 abuts the lower valve seat 30, hot water can flow into the 1*ff123 from the inflow port A through the notch 32. Notch 32 of this lower valve seat 30
．． The opening area of . Also, the diameter of the valve body 21 is smaller than the inner diameter of the large diameter portion 221L of the spherical valve body 220.
The gap with the inner peripheral surface becomes a flow path for hot water.

In FIG. 4, 40 is a lassoator, 41 is a thermostat, and P is a water ponzo.

In the heating device having the above configuration, when the heater cock 11 is opened, the hot water circulating inside the Enson is supplied from the engine 10 side through the supply channel 8 to the heat exchanger 1.
As described above, heat is exchanged with the air flowing in the ventilation passage 3 of the heater section 2 to generate warm air, which is then blown out from each blow-off lower into the car stiffness. The hot water that has passed through the heat exchanger 1 is returned to the engine 10 side through a return flow path 9.

Here, when the rotational speed of the engine 10 is low and the amount of water supplied from the engine 10 side to the flow control valve 20 side is small, the valve body 21 contacts the lower valve seat 30 due to its own weight.
, inflow boat) A flows into the valve chamber 23 through the notch 32, and further flows out from the outflow boat B. In this case, the flow path passes through the notch 32 of the lower valve seat 30, so the flow path surface 8ii is large and the flow path resistance is small. Therefore, the ik of the hot water that passes through the flow rate side @9f20 and flows into the heat exchanger 1 increases to 0%.When the capacity of the water ponzo P is small, as much hot water as possible can flow to the heat exchanger 1 side.

7 First, when the engine speed is high, the flow rate of hot water flowing from the engine 10 side to the inflow boat A of the flow control valve 20 increases, and the water pressure PW1 on the inflow boat A side and the water pressure on the outflow boat B side increase. When the differential pressure ΔW (PWI PW2) of PWs increases and this differential pressure exceeds a predetermined pressure (greater than the weight of the valve body 21), the valve body 21 moves upward as shown by the dotted line in FIG. and is still in contact with the lower valve seat 29, and the upper valve seat 2
No. 9 valve seat opening 29b is closed. As a result, the hot water that has entered the valve chamber 23V3 from the inlet port A flows out from the hole 31 in the circumferential wall 29a of the upper valve seat 29 B4C. Therefore, the area of the hot water flow path is reduced and the flow resistance increases. Therefore, the increase in the flow rate of hot water sent from the outflow port B to the heat exchanger 1 is reduced, and the increase in the flow rate of hot water sent from the outflow port B to the heat exchanger 1 is reduced.
, 9 etc., the pressure increase applied to the waterway system is controlled by the flow control valve 20.
pressure loss.

In this way, engine 10
Even if the amount of water supplied from the side changes, the opening degree of the flow control valve 20 is automatically adjusted based on the balance between the weight of the valve body 21 and the differential pressure ΔW, and the amount of water flowing to the heat exchanger 1 is adjusted to the desired level. The amount of heat exchanged by the heat exchanger 1 can be stabilized by being kept constant.

Fig. 5 shows the percentage of the flow rate control valve 20, and the solid line shows the relationship between the amount of circulating water and the differential pressure between each bow A and B when the valve body 21 is seated on the lower valve seat 30. The broken line indicates the characteristics when the valve is seated on the upper valve seat 29. That is, the differential pressure (pressure loss) is larger when the upper valve seat 29 is seated than when the lower valve seat 3 is seated. This valve characteristic can be adjusted by changing the opening area of the hole 31 of the 1L upper valve seat 29 of the valve body 21, the notch 32 of the lower valve @S30, etc.

Although the valve body 21 is spherical in the above embodiment, it is not limited to a spherical shape, and may have another shape such as a disk shape. Furthermore, the flow IllIIIJIll square is not limited to those in the examples, as long as the flow area is narrowed when the amount of water supplied from the engine 10 side increases, and the area of the flow path is expanded when the amount of water supplied is decreased.

(Effects of the Invention) According to the present invention, even if the engine speed increases and the amount of water supplied from the engine increases, the amount of water supplied to the heat exchanger is controlled by the flow rate control valve.
cA It is advantageous in terms of durability because no large pressure is applied. Furthermore, when the amount of water supplied from the engine decreases when the engine is running at low speeds, the flow path of the control chamber opens and increases the amount of water supplied to the heat exchanger. The resulting fluctuation in the amount of water supplied to the heat exchanger can be made as small as possible, and the heating lid from the heat exchanger can be stabilized regardless of the running condition. In addition, there is no need to provide a piping/cess passage as in the past, which is advantageous in terms of space, and the durability of the piping system is improved because hot water does not flow into the circulation channel when the heater cock is closed. is obtained 0

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a current control valve of a vehicle heating system according to one embodiment of Honhon-Kan, and Fig. 2 is a cross-sectional view taken along the line ■-n of Fig. 1.
Figure 3 is I-IN! of Figure 1! 4 is a circuit diagram of the circulation channel system of the vehicle heating system of this embodiment, FIG. 5 is a characteristic diagram of the #LW control valve of FIG. 1, and FIG. 6 is a diagram of the conventional vehicle heating system. FIG. 7 is a schematic configuration diagram, and FIG. 7 is a schematic configuration diagram of the vicinity of the bypass passage in FIG. 6. Explanation of symbols 1...Heat exchanger 2...Heater part 8...
Supply flow path (circulation waterway) 9... Return flow 18 (circulation waterway) 10... Engine 11... Heater cock 20... Device control valve 21... Valve body 22.
... How song 23 ... Valve chamber 29 ... Upper valve seat 30 ... Lower nine seat 31 ... Hole
32...notch. N 102 toy fof 104

Claims (1)

[Claims] In a vehicle heating system that circulates hot water around the engine to a heat exchanger in the heater section through a circulation channel, when the amount of hot water supplied increases to the upstream side of the heat exchanger in the circulation channel, the flow path area is narrowed and the supply is carried out. A vehicle heating device characterized by being provided with a flow control valve that expands the flow path area when the amount of water decreases.