JPH089290B2 - Hot water circuit device for vehicle - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a safety device for a hot water circuit for heating a vehicle having a hot water heating device, and particularly to an abnormal pressure rise in the hot water circuit due to forgetting to open the hot water valve or the like. The present invention relates to an abnormal pressure prevention device that prevents

[Conventional technology]

FIG. 2 shows a hot water circuit of a heating system for a vehicle preheating heater conventionally used for heating the inside of a passenger compartment of a bus. A water jacket 3a having cooling water for cooling the engine 3 is connected to a radiator 2 by a pipe 10. The cooling water is connected and the radiator radiates heat.

Further, the water jacket 3a is connected to a second hot water passage 10A including the radiator 2 in parallel with a first water heater 10B including a preheating heater 5 which is a heating device for hot water. An electric water pump 4 for circulating cooling water, a preheater heater for heating the cooling water to a predetermined temperature to make it warm water, and a plurality of radiators 8a to 8d are arranged in the first warm water passage 10B. It is set up. Of these radiators, 8a, 8b, 8c are arranged under the seats in the passenger compartment of the bus and are used for heating the passenger compartment. On the other hand, the radiator 8d is arranged near the driver's seat and is used for defrosting the windshield through the doub.

There are two manual valves between the hot water channels 10A and 10B.
1A and 1B are provided, and the valves 1A and 1B are closed during the summer when the preheating type heater is not used, so that cooling water is not introduced to the hot water channel 10B side.

Conventionally, when the preheat type heater is used again in the winter, or after the first hot water channel 10B side is inspected and repaired and the valves 1A and 1B are forgotten to be opened and the preheat type heater 5 is activated. There is.

Therefore, in the past, in order to solve the above problems, the first
A safety device is known in which a water temperature sensor is attached to the preheated heater 5 in the warm water passage 10B or when the water temperature sensor reaches a predetermined temperature, the preheated heater 5 is stopped.

However, in the above-described conventional safety device, even after the preheater heater is stopped, the temperature rises due to the residual heat in the combustion chamber of the preheater heater, the inside of the heat exchanger 5a becomes abnormally high temperature and high pressure, and heat exchange occurs. There was a possibility that the container 5a and the hot water pipe 10 would be deformed and, in the worst case, damaged.

[Problems to be solved by the invention]

Therefore, the present invention is made to prevent an abnormal pressure rise in the hot water circuit when the heating device is operated by forgetting to open the valve provided in the hot water circuit.

[Means for solving problems]

In order to achieve the above object, the present invention provides a heating device and a preheating device for preheating engine cooling water of a vehicle and using the preheated engine cooling water as a heating heat source for the vehicle. A first hot water passage having a radiator for radiating heat of the engine cooling water to heat the vehicle, a second hot water passage having a radiator for cooling the engine and the engine cooling water, and provided in the radiator, A pressure regulating valve that opens when the pressure in the second warm water passage reaches a predetermined pressure or higher; a valve provided in a pipe connecting the first warm water passage and the second warm water passage; and a valve body of this valve And a communication passage communicating with the first hot water passage and the second hot water passage when the valve is opened, and the pressure of the first hot water passage provided in the communication passage reaches a predetermined pressure or more. That the opening, and the check valve when communicating the communication passage, is to use a configuration of a technical means provided with a.

[Operation and effect of the invention]

According to the above means, in the present invention, since the check valve is provided in the valve body of the valve, even if the valve is forgotten to be opened and the heating device is operated, the pressure in the first hot water channel is equal to or higher than the predetermined pressure. Then, the check valve provided on the valve body opens. Therefore, since the hot water inside the first hot water passage flows into the second hot water passage side and is released to the outside by the pressure regulating valve, the pressure inside the first hot water passage is prevented from becoming abnormally high, and the hot water pipe and It is possible to reliably prevent pressure deformation and damage of the heating device.

Further, since the existing pressure adjusting valve provided in the radiator of the second hot water passage is used to adjust the pressure equal to or higher than the set pressure in the first hot water passage, the pressure adjustment of the first hot water passage is It suffices to provide a check valve on the valve body of the valve that closes the water passage, and therefore the cost is lower than the case where a pressure adjusting valve is newly used instead of the above valve.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings.

Since the hot water circuit for heating the vehicle in the embodiment of the present invention is the same as the one shown in FIG. 2 of the above [Prior Art], the description of the hot water circuit is omitted.

Fig. 1 shows the structure of valve 1B, which is piped.
The connection ends 1a and 1b are screwed and connected to 10.
In this case, the connection end 1a is connected to the second hot water channel 10A side, and the connection end 1b is connected to the first hot water channel 10B side. The bronze housing of the valve 1B is divided into a first housing 1c, a second housing 1d, and a third housing 1e.
And the second housing 1d are bolted with a gasket 11 between them.
Connected by 14. The second housing 1d and the third housing 1e are connected by a bolt 13 via a gasket 12, and a packing retainer 16 is bolted to the third housing 1e.
Installed by 15. This packing retainer 16, third housing 1e, second housing 1d, first housing 1c
The valve rod 17 is attached through the central portion of the. A handle 18 is fixed to the upper end of the valve rod 17 by a nut in FIG. 1, and a valve body is attached to a lower end of the valve rod 17 provided with a threaded portion.
19 is screwed on.

Therefore, when the valve 1B is opened, if the handle 18 is rotated counterclockwise, the valve rod 17 rotates counterclockwise and the valve body is rotated.
19, 1st, 2nd, 3rd along the thread provided on the valve rod
It moves upward in the housing (1c, 1d, 1e) and opens the conduit in the first housing 1C.

On the other hand, when closing the valve 1B, if the handle 18 is rotated clockwise, the valve body 19 moves downward and the pipe 20
Close.

A communication hole 20a is bored in the center of the valve body 19, and a check valve 30 is provided on the connection end 1a side of the communication hole 20a.

FIG. 3 is an enlarged view of that portion, and the rubber disk 31
Is attached to the valve body 19 by a screw 33 via a circular plate 32 made of stainless steel so as to prevent one end of the communication hole 20a.

The valve 1A has the same structure as the valve 1B except that the communication hole 20a and the check valve 30 are not provided.

The operation of the present embodiment having the above configuration will be described. First, when the radiator is used, that is, when heating, the valves 1A and 1B are manually opened, and the cooling water of the engine 3 is passed through the heat exchanger of the preheating heater 5 by the electric water pump 4 and the radiator 8a.
It sends it to ~ 8d and dissipates the cooling water heat into the passenger compartment to heat the passenger compartment. In this case, the preheat type heater 5 starts the operation and raises the water temperature when the outside water temperature is extremely low, or when the cooling water temperature decreases when the engine 3 is idling and the heat source from the engine is small.

On the other hand, when the season is off or the heater cooling water circuit is out of order, the cooling water system is separated into the second warm water passage 10A on the engine 3 side and the second warm water passage 10B on the heater side by closing the valves 1A and 1B. In this case, as shown in FIG. 3, the check valve 30 of the valve 1B receives the force in the direction of the arrow F or the side of the second hot water channel 10A, so that the disc 31 closes the communication hole 20a. Therefore, since the cooling water does not flow to the radiator 8 when the season is off,
The warm air does not come out from the radiators 8a to 8d, and the vehicle can be operated without the engine cooling water coming out even if the radiators 8a to 8d are removed due to a failure of the heater.

Next, when the preheating heater 5 is mistakenly operated with the valves 1A and 1B closed again, the combustion heat of the preheating heater 5 causes the pressure in the hot water passage 10B to rise. However, when the pressure rises, for example, 0.5 kg / cm ² or more, the disc 31 of the check valve 30 provided in the valve 1B opens due to the pressure as shown by the dotted line in FIG. Second hot water channel 10 on the side
When it is transmitted to A and rises above the valve opening pressure of the radiator cap 2a, the pressure is released to the outside, and the pressure of the cooling water system does not rise above the valve opening pressure. Therefore, heating equipment, piping parts, etc. will not be damaged by abnormally high pressure.

Next, another embodiment of the present invention will be described. FIG. 4 shows an example in which the check valve mechanism of the present invention is applied to a screw-in angle valve, the valve body 40 of which has communication holes 40a and 40b.
The check valve 30 shown in FIG. 3 is provided in the communication hole 40b.

FIG. 5 shows an example in which a ball valve is applied to the present invention, and the spherical valve body 50 is rotated in the arrow S direction. FIG. 5 shows the closed state. The valve body 50 is provided with communication holes 50a and 50b, and the communication hole 50b is provided with the check valve 30 shown in FIG.

In the structure of the check valve shown in FIG. 3, it goes without saying that the disc 31 is not limited to rubber and may be made of elastic metal or resin, for example.

Further, the manufacture of the check valve is not limited to that shown in FIG. 3, and the check valve may be fitted in the valve body, or may be constructed in combination with the coil spring.

Further, in the above embodiment, the check valve 30 is provided only in 1B of the valves 1A and 1B, but it goes without saying that both the valve 1A and the valves 1A and 1B may be provided.

[Brief description of drawings]

1 is a sectional view of a valve of the present invention having a check valve in the valve body of the valve, FIG. 2 is a schematic view showing a hot water circuit of the related art and the present invention, and FIG. 3 is a partially enlarged view of FIG. FIG. 4, FIG. 5 and FIG. 5 are sectional views of valves showing another embodiment of the present invention. 1B ... valve, 19,40,50 ... valve element, 30 check valve, 5 ... preheating heater (heating device), 2a ... radiator cap (pressure adjusting valve), 10A ... second hot water channel, 10B ... First hot water channel, 20a, 40a, 40b, 50a, 50b ... Communication holes.

Claims (1)

[Claims] 1. A vehicle for preheating engine cooling water of a vehicle and using the preheated engine cooling water as a heating heat source for the vehicle, comprising: a heating device for preheating the engine cooling water; and heat of the preheated engine cooling water. A first hot water channel having a radiator for radiating heat to heat the vehicle; a second hot water channel having a radiator for cooling the engine and the engine cooling water; and a pressure of the second hot water channel provided on the radiator. Pressure control valve that opens when the pressure exceeds a predetermined pressure, a valve that is provided in a pipe that connects the first hot water channel and the second hot water channel, and a valve body that is provided in the valve body of the valve and that closes the valve. A communication passage that connects the first hot water passage and the second hot water passage when the valve is opened, and a communication passage that is provided in the communication passage and opens when the pressure of the first hot water passage reaches a predetermined pressure or higher, and connects the communication passage. Hot water circuit for a vehicle, characterized in that it comprises a check valve which, the.