JP2004162609A - Electric water pump with check valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric water pump with a check valve for securing the draining performance of condensed water in a motor chamber and improving submergence resistance for preventing the infiltration of water into the motor chamber from the outside by low-cost means. <P>SOLUTION: A case 12 for storing a motor 11 of the electric water pump having the motor 11 as a driving device, is formed with a drip hole 12a, and a hose 41 containing the check valve 42 is connected to the drip hole. The check valve is normally open to drain the condensed water in the case to the outside and is closed when the water is about to infiltrate from the outside, to prevent the infiltration of water into the case from the outside. The open end of the hose faces the front side of a vehicle. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electric water pump having a motor as a drive device, and more particularly to an electric water pump with a check valve provided with a check valve for discharging condensed water generated in a motor chamber to the outside.
[0002]
[Prior art]
Conventionally, in a hybrid vehicle, both an engine-driven water pump and an electric water pump are provided in a hot water circuit of an engine having a heating heat exchanger (heater core), and when the engine is operating, hot water is supplied by the engine-driven water pump. In addition to circulating in the circuit, when the engine is stopped, the electric water pump is operated to circulate hot water to the hot water circuit, thereby heating the vehicle interior. (For example, refer to Patent Document 1).
[0003]
[Patent Document 1]
JP-A-11-2344 (Page 4, FIG. 1, FIG. 3)
[0004]
In an electric water pump having a motor as such a driving device, a drain hole is provided in a motor chamber for discharging condensed water due to heat generation and cooling of the motor. However, if the electric water pump is mounted in a harsh environment in the engine room where water is spilled, water will penetrate through the drain holes when running on a flooded road, causing corrosion and malfunction of the motor, which is an electric component. There was something. For this reason, there are restrictions on the mounting location of the electric water pump.
[0005]
[Problems to be solved by the invention]
The present invention has been made in view of the above-described problems, and has as its object to ensure the discharge performance of condensed water in the motor chamber and to operate even in a severe environment where the electric water pump may be exposed to water. Another object of the present invention is to provide an electric water pump with a check valve, which is capable of improving the water resistance to prevent water from entering the motor chamber from the outside by means of inexpensive means.
[0006]
[Means for Solving the Problems]
The present invention provides an electric water pump with a check valve described in each claim as means for solving the above-mentioned problem.
The electric water pump with a check valve according to the first aspect is configured such that a hose having a check valve is connected to a drain hole provided in a case that houses the motor. Even when the motor is installed in a harsh environment, the condensed water generated in the motor case can be discharged, and water can be prevented from entering the case from the outside. Dysfunction can be prevented.
[0007]
In the electric water pump with a check valve according to the second aspect, the open end of the hose is directed toward the front of the vehicle, whereby the check valve is easily subjected to water pressure from the outside, and the water inflow path is formed. Can be securely closed.
In the electric water pump with a check valve according to the third aspect, the valve seat of the check valve is formed integrally with the hose, whereby the number of parts can be reduced.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an electric water pump with a check valve according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an entire configuration of an electric water pump with a check valve according to the present invention, and an enlarged sectional view of a check valve portion A thereof. The electric water pump with a check valve of the present invention is applied to, for example, a vehicle air conditioner or a vehicle cooling device. The electric water pump WP with a check valve basically includes an electric motor part 1, a magnetic coupling part 2, a pump part 3, and a drain part 4.
[0009]
The electric motor part 1 is composed of a permanent magnet type DC motor 11, which is housed in a case 12.
The magnetic coupling portion 2 is a portion that transmits the rotation of the DC motor 11 to the impeller (blades) 31 of the pump portion 3 without contact. The pump portion 3 is a portion that supplies, for example, engine cooling water (hot water) to the heating heat exchanger. The drain portion 4 is a portion for discharging condensed water generated in the case 12 to the outside.
[0010]
The magnetic coupling part 2 is provided to completely shut off the DC motor 11 from the water atmosphere of the pump part 3, and includes a driving-side cylindrical rotary magnet 21 connected to the rotating shaft 13 of the DC motor 11, A driven-side cylindrical rotary magnet 22 is disposed concentrically at a predetermined interval on the inner peripheral side of the drive-side cylindrical rotary magnet 21. Then, the two rotating magnets 21 and 22 are integrally connected in the rotation direction by the magnetic attractive force acting between the two rotating magnets 21 and 22. The impeller 31 of the pump portion 3 is integrally connected to the driven cylindrical rotary magnet 22 of the magnetic coupling portion 2 so that the driven cylindrical rotary magnet 22 and the impeller 31 rotate integrally. Further, the magnetic coupling portion 2 is arranged in a case 12 of the DC motor 11.
[0011]
In the gap formed between the inner peripheral side of the driving-side cylindrical rotary magnet 21 and the outer peripheral surface of the driven-side cylindrical rotary magnet 22, a bottomed cylindrical waterproof made of a nonmagnetic material, for example, stainless steel is provided. The cover 23 is arranged, and the outer peripheral side end of the waterproof cover 23 is arranged and fixed between the end of the case 12 of the DC motor 11 and the end of the housing 32 of the pump portion 3. By arranging the waterproof cover 23 in this way, the DC motor 11 of the electric motor portion 1 can be completely shut off from the water atmosphere of the pump portion 3.
[0012]
The impeller 31 of the pump part 3 is connected to the rotating magnet 22 on the driven side and is disposed in the housing 32. One opening (not shown) of the housing 32 is connected to the engine side, and the other opening (not shown) is connected to a heating heat exchanger, so that hot water from the engine is supplied to the heating heat exchanger. Can be supplied to
[0013]
The drain portion 4 is a feature of the present invention and includes a hose 41 and a check valve 42 built in the hose. The hose 41 is connected to a drain hole 12 a formed in the case 12 of the DC motor 11, and a check valve 42 is disposed at an end on the open side to the outside. As shown in an enlarged view in FIG. 1, the check valve 42 includes a valve body 421 that forms a valve chamber 421a, a valve body 422 that moves up and down in the valve chamber 421a, and discharges condensed water to the outside. And a cover member 423 that covers a valve chamber 421a in which a discharge port 423a whose diameter is considerably smaller than the inner diameter of the hose 41 is formed. A valve seat 421b is formed above the valve body 421. Further, the valve body 422 has a hemispherical portion 422a that contacts the valve seat 421b and a leg portion 422b that contacts the inner surface of the lid member 423.
[0014]
Therefore, as shown in the operation diagram of FIG. 2A, the valve body 422 normally has its leg 422 b abutting against the lid member 423 by its own weight, so that the discharge path of the condensed water generated inside the case 12 is formed. Is secured. That is, the condensed water enters the valve chamber 421a from the opening of the valve seat 421b through the hose 41 through the drain hole 12a, and is further discharged to the outside through the discharge port 423a. When the pressure of the intruded water is received from the outside, as shown in FIG. 2 (b), the valve body 422 is displaced upward and abuts on the valve seat 421b, so that the condensed water discharge path (water inflow path) is formed. ) Is closed, so that intrusion water does not enter the case 12 from outside through the hose 41.
[0015]
The open end of the hose 41 to the outside is preferably directed toward the front of the vehicle. By doing so, the valve body 422 is easily displaced upward by water pressure against water intrusion from the outside, and the discharge path can be effectively closed to prevent water intrusion.
Further, the hose 41 and the check valve 42 are preferably made of synthetic resin or rubber.
[0016]
FIG. 3 shows another embodiment of the check valve 42. In this embodiment, a valve body 421 forming a valve chamber 421 a of the check valve 42 is formed integrally with the hose 41. The other configuration is the same as the check valve of the above-described embodiment. Thereby, the number of parts can be reduced.
[0017]
In the above description, the electric water pump is described as an example. However, it is needless to say that the electric water pump can also be used. Further, although the description has been made exclusively for a vehicle as an application, the present invention can be appropriately applied to an electric water pump and an electric water valve used for other purposes.
[0018]
As described above, in the related art, when the electric water pump and the electric water valve are mounted in a place where the environment to be exposed to water is severe, there is water intrusion from the drain hole of the condensed water in the motor room during traveling on the inundated road, In order to avoid this, there was a restriction on the mounting location. However, in the present invention, the hose for discharging the condensed water has a simple configuration in which a check valve is built in, and the mounting location of the electric water pump and the electric water valve is free. The degree can be increased. Further, the condensed water generated in the motor chamber is normally discharged to the outside, so that corrosion and malfunction of the motor portion can be prevented.
[Brief description of the drawings]
FIG. 1 is a diagram showing an entire configuration of an electric water pump with a check valve according to an embodiment of the present invention, and an enlarged sectional view of a check valve portion A thereof.
FIG. 2 is a view for explaining the operation (a) and (b) of the check valve in the electric water pump with a check valve according to the present invention.
FIG. 3 is a view showing another embodiment of a check valve portion.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Electric motor part 11 ... DC motor 12 ... Case 12a ... Drain hole 13 ... Rotating shaft 2 ... Magnetic coupling part 21 ... Cylindrical rotating magnet 22 on the driving side ... Cylindrical rotating magnet 23 on the driven side ... Waterproof cover 3 ... Pump part 31 Impeller 4 Drainage part 41 Hose 42 Check valve 421 Valve body 421a Valve chamber 421b Valve seat 422 Valve body 423 Cover member

Claims (3)

An electric water pump having a motor as a driving device,
A case for housing the motor,
A drain hole provided in the case, for discharging condensed water generated in the case,
A hose connected to the drain hole and having a built-in check valve;
An electric water pump with a check valve, comprising: The electric water pump with a check valve according to claim 1, wherein the open end of the hose faces forward of the vehicle. The electric water pump with a check valve according to claim 1, wherein a valve seat of the check valve is formed integrally with a hose.

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