JPH10109526A - Valve device for heating circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent abnormal sound from being generated from a cooling water circuit for heating by arranging a heater port communicated with an inflow side of a heater core in the upper side than an internal combustion engine side port and a tank port in a valve for a heating circuit SOLUTION: When a cooling water temperature is low, a thermostat 80 in a valve 7 for a heating circuit closes an opening part 85 and a valve body 87 closes a valve port 86 so that the cooling water flowing from an engine port 72 to the valve 7 flows out to a heat storage tank through a first tank path 77. On the other hand, the cooling water in the heat storage tank flows into the heater core, heats the air to be fed in a car compartment here, produces the hot air, and then flows into the engine. Namely, the heating is effectively executed, even when the cooling water is low temperature. Then, the heater port 7 is positioned on the topmost position of the valve 7 so that the inflow air (air bubble) is collected on the top, flows towards the heater core 3, and therefore is prevented from being stagnated in the valve 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve device for a heating circuit applied to a heating cooling water circuit having a heat storage tank for keeping the cooling water of a water-cooled internal combustion engine (hereinafter referred to as an engine) warm. It is.

[0002]

2. Description of the Related Art A cooling water circuit for heating (hereinafter, abbreviated as "cooling water circuit") having a heat storage tank is disclosed in, for example, Japanese Patent Application Laid-Open No. Hei 6-2.
As described in Japanese Patent No. 78449, the amount of cooling water flowing through the heat storage tank and the amount of cooling water flowing through the heater core are adjusted using a valve device for a heating circuit (hereinafter abbreviated as a valve device).

[0003]

By the way, the inventors examined the prototype of the cooling water circuit described in the above-mentioned publication and found that when the cooling water flows, a problem such as generation of abnormal noise from the cooling water circuit occurs. did. Then, the inventors and the like continued their studies and found that the above-described inconvenience occurred due to the causes described below.

That is, not only the cooling water circuit described in the above publication, but also a radiator cap at the top of the radiator is generally provided with a pressurized radiator cap, and the radiator cap has a predetermined pressure inside the radiator. Is exceeded, the valve in the radiator cap is opened, and the air collected in the radiator cap is discharged out of the cooling water circuit together with the cooling water. Therefore, in order to discharge air (hereinafter, simply referred to as air) mixed in the cooling water circuit to the outside of the cooling water circuit, it is necessary to collect the air in the radiator cap.

On the other hand, the valve device has a relatively complicated structure, such as a mechanism for adjusting the amount of cooling water flowing through the heat storage tank and the amount of cooling water flowing through the heater core, as described above. The air mixed in the cooling water circuit tends to stay in the valve device. For this reason, since it becomes difficult for the air to collect on the radiator cap portion, the air continues to stay in the cooling water circuit.

On the other hand, in the cooling water circuit having the heat storage tank, since the mechanism for adjusting the amount of cooling water is indispensable, the air mixed in the cooling water circuit inevitably remains in the cooling water circuit. I will continue. Then, the remaining air vibrates during the flow of the cooling water to generate abnormal noise. To solve this problem, a measure such as enlarging a cooling water passage in the valve device can be considered. However, this method causes an increase in the size of the valve device, and deteriorates the mountability of the cooling water circuit on a vehicle. .

In view of the above, it is an object of the present invention to prevent air from accumulating in a valve device without increasing the size of the valve device in a heating cooling water circuit having a heat storage tank. .

[0008]

The present invention uses the following technical means to achieve the above object. Claim 1
In the invention described in Item 3, the heater port (75) communicating with the inflow side of the heater core (3) includes the internal combustion engine side port (72) communicating with the discharge side of the water-cooled internal combustion engine (1), and the heat storage tank (6). Tank port (7) communicating with the inlet side of
3) The air (bubbles) flowing into the housing (71) is collected at the upper heater port (75) by being located above the heater core (3). It flows toward.

Therefore, the air flowing into the housing (71) is prevented from staying in the housing (71), and the air mixed in the cooling water circuit for heating is released from the opening mechanism (21). You. As a result, since air is prevented from remaining in the heating cooling water circuit, generation of abnormal noise from the heating cooling water circuit can be prevented.

According to a second aspect of the invention, the amount of cooling water is adjusted so that the amount of cooling water flowing through the heater circuit (101) is larger than the amount of cooling water flowing through the tank heater circuit (102). . This makes it easier for the air flowing into the housing (71) to collect in the heater port (75). Therefore, since air is further prevented from staying in the housing (71), generation of abnormal noise can be further prevented.

According to the invention described in claim 3, the tank port (73) is located below the internal combustion engine side port (72). In addition, the code | symbol in the parenthesis of each said means shows the correspondence with the concrete means of embodiment mentioned later.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; (Embodiment) FIG. 1 is a schematic diagram of a cooling water circuit for heating to which a valve device for a heating circuit according to the present embodiment is applied.
FIG. 3 is a schematic diagram showing a mounting state of each component device of a cooling water circuit for heating on a hybrid vehicle (hereinafter, simply referred to as a vehicle). Incidentally, the hybrid vehicle has the engine 1 and an electric motor (not shown) as driving sources of the vehicle, and by switching between these two driving sources, reduces harmful substances discharged from the engine 1. It is intended.

In FIG. 2, reference numeral 1 denotes a water-cooled internal combustion engine (hereinafter referred to as an engine), and reference numeral 2 denotes a radiator for cooling the cooling water of the engine 1. In addition, this radiator 2 includes:
A known radiator cap 21 having an opening mechanism for releasing the internal pressure toward the atmosphere when the pressure in the radiator 2 exceeds a predetermined value is provided. (Such as the heater core 3 and the heating circuit valve device 7).

Reference numeral 3 denotes a heater core for heating the interior of the vehicle cabin using cooling water as a heat source. It is arranged in the cabin CA. Reference numeral 5 denotes a dash panel that partitions an engine room EA in which the engine 1 and the radiator 2 and the like are disposed from a vehicle room CA.

Reference numeral 6 denotes a heat storage tank for keeping the cooling water warm and stored. The heat storage tank 6 is a double tank type made of a material having excellent corrosion resistance such as stainless steel and having a vacuum heat insulating layer. Reference numeral 100 denotes a radiator circuit through which cooling water circulates between the engine 1 and the radiator 2, 101 denotes a heater circuit that guides cooling water discharged from the engine 1 to the heater core 3, and 102 denotes a cooling circuit discharged from the engine 1. This is a tank circuit for guiding water to the heater core 3 through the heat storage tank 6. Reference numeral 103 denotes a cooling water circuit that guides the cooling water flowing out of the heater core 3 to the cooling water suction side of the engine 1.

Reference numeral 7 denotes a heating circuit valve device (hereinafter, abbreviated as a valve) for adjusting the amount of cooling water flowing through the heater circuit 101 and the tank circuit 102. The valve 7 is operated in accordance with the temperature of the cooling water. It has a well-known thermostat for adjusting the degree of opening of both circuits 101 and 102. The detailed structure will be described later. Incidentally, in FIG. 1, reference numeral 8 denotes a mechanical water pump that circulates cooling water by obtaining power from the engine 1, and 9 denotes an electric water pump that circulates cooling water by obtaining electric power from a battery (not shown). Reference numeral 10 denotes a check valve for preventing a so-called short circuit phenomenon in which cooling water circulates only in the electric water pump 9 when the electric water pump 9 is operated.

Next, the structure of the valve 7 will be described with reference to FIG. Reference numeral 71 denotes a housing made of resin such as nylon 66 which is excellent in moldability and heat insulation. The housing 71 has an engine port (internal combustion engine side port) 72 communicating with the discharge side of the engine 1, a first tank port (tank port) 73 communicating with the inflow side of the heat storage tank 6, and a heat storage tank 73. A second tank port 74 communicating with the outflow side of the heater core 6 and a heater port 75 communicating with the inflow side of the heater core 3 are formed.

The valve 7 is disposed in the engine room ER such that the heater port 75 is located at the uppermost position, and the second tank port 74, the engine port 72, and the first exhaust tank port 73 are arranged in this order. (Figures 1, 2
reference). A heater passage 76 communicating from the engine port 72 forming a part of the heater circuit 101 to the heater port 75 and a tank passage 77 communicating from the engine port 72 forming a part of the tank circuit 102 to the first tank port 73 are formed. A thermostat 80 that opens and closes the heater passage 76 is disposed at a branch site A (hereinafter, referred to as a space A).

The tank passage 77 includes a passage that passes through an orifice 91 described later to the first tank port 73 and a passage that passes through a valve port 85 described later to the first tank port 73 (see FIG. 5). Hereinafter, the former is referred to as a first tank passage 77, and the latter is referred to as a second tank passage 78. A passage communicating from the second tank port 74 to the heater port 75 is referred to as a third tank passage 79.

Reference numeral 81 denotes a metal casing of the thermostat 80. A plurality of openings (not shown) forming a flow path of cooling water are provided on the side surface and both ends thereof. A wax box 82 filled with a wax having a predetermined melting point (about 45 ° C. in the present embodiment) is disposed on the shaft so as to be slidable in the vertical direction.

A flange portion 83 is provided on the heater port 75 side of the wax box 82. The flange portion 83 is pressed against an opening 85 on the heater port 75 side via a return spring 84. I have. The opening and closing of the opening 85 is performed by the wax box 82.
Is controlled by sliding. Also, 86
Is a valve port for communicating the space A with the first tank port 73, and a resin valve element 87 for opening and closing the valve port 86 and a valve seat contacting the valve element 87 are provided at a peripheral portion of the valve port 86. 88
The valve seat 88 is integrally formed of resin together with a housing 89 forming the space A.

The valve body 87 is provided with a spring 9 provided in a space B formed below the housing 71.
It is pressed to the space A side via 0. The valve element 87 has an orifice (small hole) 91 for communicating the space A with the space B. The orifice 91
Communicates only when the cooling water temperature is low, as described later.

Next, the operation of the cooling water circuit will be described. 1. Cooling water temperature is low (45 ° C. or less in this embodiment)
When the temperature of the cooling water is low, the thermostat 80 closes the opening 85 and the valve body 87 closes the valve port 86 as shown in FIG. As a result, the valve 7
Flows into the heat storage tank 6 through the first tank passage 77, and the cooling water stored in the heat storage tank 6 flows into the heater core 3 from the third tank water passage,
After heating the vehicle interior by the heater core 3, the coolant flows into the engine 1 through the cooling water 103 (see FIG. 4).

Therefore, the high-temperature cooling water kept warm and stored in the heat storage tank 6 flows into the heater core 3, so that the vehicle interior can be heated even when the cooling water is low. 2. When the temperature of the cooling water is high (in this embodiment, it exceeds 45 ° C.) When the temperature of the cooling water is high, the wax box 82 extends to the space B side to open the opening 85 as shown in FIG. Orifice 9 at the end of box 82
While closing 1, the valve body 87 is pushed to open the valve port 86.

As a result, the cooling water flowing from the engine port 72 into the valve 7 flows through the heater passage 76 and the second tank passage 78, so that the cooling water flowing through the heater passage 75 and the heat storage tank 6 flow through the heater core 3. The cooling water stored therein flows in (see FIG. 1). Therefore, it is possible to heat the vehicle interior while supplying the high-temperature cooling water to the heat storage tank 6.

At this time, the amount of cooling water flowing through the heater passage 76 is adjusted to be larger than the amount of cooling water flowing through the second tank passage 78. In this embodiment, the amount of cooling water flowing through the heater passage 76 is About 9000cc / mi
n, and the amount of cooling water flowing through the second tank passage 78 is
It is about 1000 cc / min as described later. By the way, the cooling water circuit for heating shown in the present embodiment, as is clear from the above description of operation, the cooling water stored in the heat storage tank 6 while the temperature of the cooling water discharged from the engine 1 is low. Since the interior of the vehicle is heated using water, the heat storage tank 6 is maintained until the temperature of the cooling water discharged from the engine 1 rises to an extent that the interior of the vehicle can be heated (about 45 ° C.).
It is necessary to supply the heater core 3 with high-temperature cooling water that is kept warm and stored therein.

In consideration of the size (displacement amount) of the engine 1 and the amount of cooling water, the inventors set the capacity of the heat storage tank 6 to about 3000 cc and set the capacity of the first, second, and third tank passages 77 to 79 to be small. It has been concluded that a flow rate of about 1000 cc / min is appropriate. Next, features of the present embodiment will be described.

Since the heater port 75 is located at the uppermost position of the valve 7, the air (bubbles) flowing into the valve 7 is collected at the uppermost heater port 75 and flows toward the heater core 3. Go. Therefore, the valve 7
Since the air flowing into the inside is prevented from staying in the valve 7, the air mixed in the cooling water circuit for heating easily gathers in the radiator cap 21. As a result, since air is prevented from remaining in the heating cooling water circuit, generation of abnormal noise from the heating cooling water circuit can be prevented.

The heater passage 76 (heater circuit 10)
Since the flow rate flowing through 1) is larger than the amount of cooling water flowing through the second tank passage 78 (tank circuit 102), the air flowing into the valve 7 is more easily collected at the heater port 75. Accordingly, since air is prevented from staying in the valve 7, generation of abnormal noise can be further prevented.

Further, since the first tank port 73 is located at the lowermost position, it is possible to prevent air from entering the heat storage tank 6. As a result, it is possible to prevent the air from remaining in the heating cooling water circuit. By the way, in the hybrid vehicle, the mechanical water pump 8 and the electric water pump 9 are switched over in conjunction with the switching operation between the engine 1 and the electric motor. The flow stops temporarily. For this reason, air is more likely to stay in the valve 7 than a normal vehicle having only an engine as a drive source, in which cooling water is continuously flowing.

On the other hand, the valve 7 according to the present embodiment
According to this, as described above, it is possible to prevent air from staying in the valve 7, and therefore the valve 7 according to the present embodiment is particularly effective when applied to a hybrid vehicle. By the way, in the above-described embodiment, the present invention has been described by taking a hybrid vehicle as an example. However, the present invention is not limited to a hybrid vehicle, and may be applied to a vehicle having only an engine as a drive source. it can.

In the above embodiment, the heater passage 7
6 (heater circuit 101) and the second tank passage 78
Although the amount of cooling water flowing through the (tank circuit 102) is mechanically adjusted by the thermostat 80, the amount of cooling water flowing through both passages 76 and 78 may be adjusted by an electric means such as an electromagnetic valve. Further, in the above-described embodiment, the axial direction of the thermostat 80 coincides with the vertical direction. However, the present invention is not limited to this.
May be located at the top of the housing 71, and the axial direction of the thermostat 80 may be inclined.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a cooling water circuit for heating.

FIG. 2 is a schematic diagram showing a mounting state of each device of a cooling water circuit for heating.

FIG. 3 is a cross-sectional view of the valve device for a heating circuit (when the cooling water temperature is 40 ° C. or less).

FIG. 4 is a schematic diagram of a cooling water circuit for heating.

FIG. 5 is a cross-sectional view of the valve device for a heating circuit (when the cooling water temperature exceeds 40 ° C.).

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Water-cooled internal combustion engine, 2 ... Radiator, 3 ... Heater core, 6 ... Heat storage tank, 7 ... Valve for heating circuit, 71 ... Housing, 72 ... Engine port (internal combustion engine side port), 73 ... 1st tank port (Tank) Port), 74
... second tank port, 75 heater port, 76 heater passage, 77 first tank passage, 78 second tank passage, 79 third tank passage, 80 thermostat, 1
00: radiator circuit, 101: heater circuit, 102:
Tank circuit, 103 ... cooling water circuit.

Claims (3)

[Claims] 1. A water-cooled internal combustion engine (1), a radiator (2) for cooling water of the water-cooled internal combustion engine (1), and a radiator (2) provided in the radiator (2). An opening mechanism (21) for releasing the internal pressure toward the atmosphere when the pressure exceeds a predetermined value, and a heater core (3) for heating the room using cooling water as a heat source.
A heat storage tank (6) for holding and storing cooling water; a radiator circuit for circulating cooling water between the water-cooled internal combustion engine (1) and the radiator (2); and (100) the water-cooled internal combustion engine. A heater circuit (101) for guiding cooling water discharged from (1) to the heater core (3); and a cooling water discharged from the water-cooled internal combustion engine (1) via the heat storage tank (6) to the heater core (3). And a cooling water circuit (10) for guiding cooling water flowing out of the heater core (3) to a cooling water suction side of the water-cooled internal combustion engine (1).
3) the heating circuit (101) and the tank circuit (10).
A valve device for a heating circuit for adjusting an amount of cooling water flowing through 2), comprising: a housing (71); and an internal combustion engine formed in the housing (71) and communicating with a discharge side of the water-cooled internal combustion engine (1). Side port (72)
A heater port (75) formed in the housing (71) and communicating with the inflow side of the heater core (3); and a heater port (75) formed in the housing (71) and communicating with the inflow side of the heat storage tank (6). A heating port having a tank port (73), wherein the heater port (75) is located above the internal combustion engine side port (72) and the tank port (73). apparatus. 2. The cooling water amount is adjusted so that the amount of cooling water flowing through the heater circuit (101) is larger than the amount of cooling water flowing through the tank heater circuit (102). Valve device for heating circuit. 3. The heating circuit valve device according to claim 1, wherein the tank port (73) is located below the internal combustion engine side port (72).