JP6442880B2 - Control valve - Google Patents

Description

  The present invention relates to a control valve used for a cooling system of a vehicle engine.

  The vehicle engine is controlled to raise the engine temperature as quickly as possible and maintain it at a predetermined temperature in order to improve fuel efficiency and drive the engine smoothly. Therefore, when the coolant temperature is low, the coolant control valve is closed, and the coolant is circulated through the bypass passage without passing through the radiator. When the cooling water temperature becomes high, the control valve is opened to circulate the cooling water to the radiator, and the cooling water temperature is controlled to be constant.

  Patent Document 1 discloses a control valve disposed on the cooling water outlet side of the engine. This control valve includes a valve body having a magnetic body, a valve seat that can contact the valve body, a biasing mechanism (spring) that biases the valve body toward the valve seat, and a valve body that moves toward the valve seat. And a solenoid to be operated. When the pump is operated, the valve body is configured to move in the opening direction against the urging force of the urging mechanism by the fluid pressure of the fluid discharged from the pump.

Special table 2013-525653 gazette

In the control valve shown in Patent Document 1, the valve is opened against the urging force of the urging mechanism by the fluid pressure of the fluid discharged from the pump. The fluid pressure for opening the valve depends on the discharge performance of the pump and the pressure loss of the cooling circuit. Usually, since the pump is driven at a rotation proportional to the engine speed, the output performance of the pump is low in a low rotation region such as idling. In order to open the control valve with fluid pressure in a state where the pressure loss of the cooling circuit is high and the engine speed is low, it is necessary to increase the size of the pump to improve the performance.
On the other hand, if the urging force of the urging mechanism is weakened, the valve opening operation can be performed even when the performance of the pump is low. However, the valve body easily opens due to engine vibration or vibration during vehicle travel, and the water stop effect is impaired. As a result, the engine is not warmed up quickly, resulting in inconveniences such as a reduction in fuel consumption.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a control valve capable of opening and closing a valve body quickly and reliably.

The characteristic configuration of the control valve according to the present invention includes: a valve main body that allows fluid to flow; and a valve body that is accommodated in the valve main body and that has a magnetic body and on which the fluid pressure of the fluid acts to control the flow of the fluid ; , Disposed in a position facing the valve body in the fluid flow path provided in the valve body, abuts the valve body to close the flow path, and separates the valve body from the flow path. anda valve seat for opening comprises a Luso solenoids generate a magnetic force by energizing the coil, and a biasing mechanism that biases the valve body on the side of the valve seat, said in the valve body A permanent magnet is disposed at a position facing the valve seat, and the solenoid abuts the valve body and the valve seat by generating an attractive magnetic force that attracts the permanent magnet by energizing the coil, Acting fluid pressure on the valve body from the valve seat side Was from said current supply to the coil in a state from the valve seat by generating a repulsive magnetic force to repel the permanent magnet by energization of the reverse in terms of separating the valve body.

If a permanent magnet is arranged at a position facing the valve seat in the valve body as in this configuration, the force that attracts the valve body to the valve seat when energizing the solenoid coil is increased to close the valve. Holding power can be increased. Further, by using the magnetic force of the permanent magnet, the power consumption of the solenoid for holding the valve closed is reduced, and the solenoid itself can be miniaturized.

One of the elements for opening the control valve of the present invention is a fluid pressure acting on the valve body. However, with this fluid pressure alone, for example, when the engine speed is low, the valve opening operation may become unstable. Therefore, as in this configuration, a magnetic force that repels the permanent magnet by energizing the coil in the reverse direction is generated in the solenoid. As a result, the repulsive magnetic force is applied to the fluid pressure, and the valve element can be reliably opened even when the fluid pressure is small (at a small flow rate).

Other characteristic feature of the control valve according to the present invention, the energization of the opposite direction from said reverse current is started to the coil of the solenoid to generate the repulsive magnetic force to the coil after a predetermined time has elapsed The point is to stop.

When the valve element opens by receiving the fluid pressure and the repulsive force due to the magnetic force, and the valve element and the valve seat are separated by a predetermined distance, the magnetic force generated by the permanent magnet of the valve element hardly affects the valve seat. For this reason, even if the repulsive force to the permanent magnet is extinguished, the valve element can maintain the valve open state by the fluid pressure. Therefore, as in this configuration, the energization in the reverse direction to the coil is stopped after a lapse of a predetermined time, so that the energization time of the coil at the time of valve opening can be shortened and the power consumption of the solenoid can be reduced.

Another characteristic configuration of the control valve according to the present invention is that the solenoid has a core made of a metal material, the valve seat is formed on an upper surface of the core , and the permanent magnet is disposed at a position facing the valve seat. It is in the point.

  According to this configuration, when the valve body is in the closed state, the valve seat and the permanent magnet come into contact with each other. Therefore, the adsorption force of the valve body is maximized, and the valve body can be opened and closed more quickly and reliably, and further miniaturization of the solenoid can be realized.

Other characteristic feature of the control valve according to the present invention, the solenoid has a yoke located on the outer periphery of the core and core made of metal material, the valve seat is formed on the upper surface of the front Kiko A, the permanent magnet lies in that arranged at a position facing before Kiyo over click.

  By providing the permanent magnet at a position facing the yoke even on the outer peripheral side of the valve seat as in this configuration, the magnetic force of the solenoid can be sufficiently applied to the permanent magnet. If it is this structure, it is not necessary for a permanent magnet to contact | abut a valve seat directly, and the shape and number of permanent magnets can be set suitably.

It is the schematic which shows the whole structure of an engine cooling system. It is a figure which shows the closed state of a control valve. It is a figure which shows the open state of a control valve. It is a flowchart of energization control of a solenoid. It is a principal part enlarged view of the control valve of 2nd Embodiment. It is a bottom view of a valve body. It is a bottom view of the valve body of another form.

  Hereinafter, embodiments of a control valve according to the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 shows the overall configuration of an engine cooling system in a vehicle. The engine cooling system includes an engine 1, a water pump 2 driven by the engine 1, a radiator 3 as a heat exchanger for cooling the engine, and a heater core 4 as a heat exchanger for heating the passenger compartment. The circulation path of the coolant (cooling water) includes a first circulation path R1 that circulates the coolant over the engine 1 and the radiator 3 by driving the water pump 2, and an engine 1 and the heater core 4 that are driven by the water pump 2. And a second circulation path R2 that circulates the cooling liquid over the distance. A thermostat valve 5 is connected to the first circulation path R1, and a control valve 6 capable of opening and closing the second circulation path R2 and a control device 7 for controlling the operation of the control valve 6 are provided.

The thermostat valve 5 is connected to a circulation path portion between the coolant outlet port 3b of the radiator 3 and the coolant inlet port 2a of the water pump 2 in the first circulation path R1. The control valve 6 is connected to a circulation path portion between the heating coolant outlet port (not shown) of the engine 1 and the coolant inlet port 4a of the heater core 4 in the second circulation path R2. The coolant outlet port 4 b of the heater core 4 is connected to the coolant inlet port 2 a of the water pump 2 via a flow path (not shown) formed in the housing of the thermostat valve 5.
The water pump 2 starts to be driven when the engine 1 is started, and is stopped when the engine 1 is stopped. Therefore, the water pump 2 is always driven while the engine 1 is driven.

  As shown in FIGS. 2 and 3, the control valve 6 is in contact with a housing 21 (an example of a valve body) through which a fluid flows, a valve body 10 that has magnetism and controls the flow of fluid, and the valve body 10. A possible valve seat 11, a coil spring 12 that biases the valve body 10 toward the valve seat 11, and a solenoid 13 that attracts the valve body 10 toward the valve seat 11 when energized are provided. The core 16 of the solenoid 13 constitutes a fluid flow path 20, and a valve seat 11 with which the valve body 10 abuts is provided at an end of the core 16.

  The solenoid 13 includes a cylindrical coil 14 that generates a magnetic force when energized, a resin bobbin 15 to which the coil 14 is attached, a core 16 disposed on the center side of the coil 14, and a coil 14 on the outer peripheral side of the core 16. And a yoke 17 that can be assembled to the coil 14 and the core 16 so as to form a housing space. The core 16 and the yoke 17 are made of a metal material so that magnetic flux can easily pass therethrough.

  A flow path 20 is formed on the center side of the core 16. The valve body 10 abuts and separates from the valve seat 11 formed on the upper surface 16 a of the core 16 to control the fluid flow in the flow path 20. That is, the upper surface 16 a of the core 16 corresponds to the valve seat 11. When the coil 14 of the solenoid 13 is excited, the valve body 10 is attracted to the valve seat 11 side.

  The housing 21 includes a first housing 21 </ b> A in which the solenoid 13 is housed, and a second housing 21 </ b> B having an outflow port 22. Both members are connected to each other by engaging an annular protrusion formed at one end of the second housing 21B with an annular groove formed at one end of the first housing 21A.

  A coil spring 12 is installed between the valve body 10 and the inner wall surface of the second housing 21 </ b> B, and the coil spring 12 biases the valve body 10 toward the valve seat 11. A permanent magnet 18 is disposed on the back side of the valve body 10 (side facing the valve seat 11). The permanent magnet 18 is formed in an annular shape that can contact the entire valve seat 11, and is fixed to the valve body 10.

When the engine 1 is stopped, the water pump 2 is also stopped and no fluid pressure is generated. The solenoid 13 (coil 14) is not energized. For this reason, the valve body 10 is brought into contact with the valve seat 11 by the urging force of the coil spring 12, and is held in the closed position by receiving the attractive force of the permanent magnet 18 (FIG. 2).

Energization of the solenoid 13 (coil 14) is controlled by the control device 7 based on, for example, the flowchart shown in FIG.
When the ignition key is inserted into the key cylinder and the ignition is turned ON, the engine start operation is detected, and before the engine 1 is started, energization to the solenoid 13 (coil 14) is started (step # 1, # 2).

When the solenoid 13 (coil 14) is energized A in step # 2, the valve body 10 is attracted to the valve seat 11, and the control valve 6 is closed. Here, energization (energization ) to the solenoid 13 (coil 14) that generates a polarity (S pole) that attracts the permanent magnet 18 (for example, the polarity toward the valve seat 11 is N pole) to the valve seat 11 (core 16). A) is performed. Thereby, in addition to the urging force by the coil spring 12, an attractive force (magnetic force) acts on the valve body 10 between the permanent magnet 18 and the valve seat 11, and the valve closed state is maintained (FIG. 2). ). Thus, since the valve closing retention force of the valve body 10 is enhanced, the valve opening operation of the control valve 6 due to the fluid pressure immediately after the operation of the water pump 2 can be prevented.

Thereafter, in step # 4, when it is determined that the water temperature of the coolant (cooling water) inside the engine 1 is equal to or higher than the predetermined temperature (T1), the polarity at which the permanent magnet 18 (for example, N pole) repels the core 16. Energization (energization B) is performed to the solenoid 13 (coil 14 ) that generates (N pole) (step # 5). As a result, the valve body 10 receives the repulsive force (magnetic force) from the core 16 in addition to the fluid pressure from the flow path 20, and the valve body 10 moves in the valve opening direction. (Figure 3).

When a predetermined time (for example, 1 second) elapses after the energization of the solenoid 13 (coil 14) in step # 5 (step # 6), the energization of the solenoid 13 (coil 14) is stopped (step # 7). When the valve body 10 moves in the valve opening direction, the valve body 10 moves to the fully open position in about 1 to several seconds, for example. In the open state where the valve body 10 is separated from the valve seat 11, the magnetic force of the permanent magnet 18 of the valve body 10 hardly affects the valve seat 11. For this reason, since the valve body 10 is kept open by the fluid pressure, it is not necessary to energize the solenoid 13 (coil 14) . By opening the valve body 10, the temperature of the coolant (cooling water) inside the engine 1 gradually decreases.

  The coolant is heated inside the engine 1, then cooled by the radiator 3, and returns to the water pump 2 via the thermostat valve 5. When the coolant (cooling water) of the engine 1 is low temperature, the thermostat valve 5 is closed. During the heating operation, the coolant heated inside the engine 1 is supplied to the heater core 4 via the control valve 6 held open by the fluid pressure, and the room is warmed. The coolant cooled by the heater core 4 returns to the water pump 2 again via the thermostat valve 5.

  By controlling the opening and closing of the valve body 10 in this manner, the cooling water temperature of the engine 1 can be raised early and maintained within a certain range, and the combustion state of the engine 1 can be stabilized.

[Second Embodiment]
As shown in FIG. 5, the permanent magnet 18 on the back surface side of the valve body 10 may be disposed at a position facing the yoke 17. When the control valve 6 is closed, the valve seat 11 of the core 16 and the valve body 10 are in contact with each other. In the present embodiment, since the permanent magnet 18 does not directly exhibit the water stopping function, the permanent magnet 18 can be arranged at a position where it does not contact the yoke 17. For example, the permanent magnets 18 may be arranged continuously over the entire circumference on the back surface side of the valve body 10 as shown in FIG. 6, or evenly distributed over the entire circumference as shown in FIG. You may arrange. However, it is preferable that the permanent magnet 18 and the yoke 17 are close to each other when the yoke 17 exerts an attractive force or a repulsive force with respect to the permanent magnet 18.

[Other Embodiments]
(1) In the above embodiment, the example in which the energization control of the solenoid 13 (coil 14) is performed according to the water temperature of the coolant (cooling water) of the engine 1 has been shown, but the solenoid 13 (coil) according to the engine load. The energization control to 14) may be performed.

(2) In the above embodiment, the example in which the permanent magnet 18 is disposed in an exposed state has been described. However, the permanent magnet 18 may be covered with a cover body or the like.

(3) In the above embodiment, the example in which the permanent magnet 18 is disposed on the magnetic valve body 10 has been described. It may be configured.

(4) In the above embodiment, the control valve 6 is applied to the coolant control valve that opens and closes the flow path to the heater core 4. However, the control valve 6 is applied to the thermostat valve 5 that opens and closes the flow path to the radiator 3. May be.

(5) Although the control valve 6 is used in the cooling system of the engine 1 in the above embodiment, the control valve 6 may be applied to a catalyst cooling system or a liquid-cooled oil cooler installed in the exhaust pipe. In addition, the present invention may be applied as a cooling liquid control valve for a heat source cooling system or exhaust heat recovery system for motors, inverters, secondary batteries, fuel cells and the like used in electric vehicles.

  The control valve according to the present invention can be used for a wide range of cooling objects in various vehicles.

1 Engine 2 Water pump 6 Control valve 10 Valve body 11 Valve seat 12 Coil spring (biasing mechanism)
13 Solenoid
14 Coil 16 Core 16a Upper surface 17 Yoke 18 Permanent magnet 20 Flow path 21 Housing (Valve body)

Claims (4)

A valve body for circulating fluid;
A valve body that is housed in the valve body, has a magnetic body, and a fluid pressure of the fluid acts to control the flow of the fluid ;
The fluid flow path provided in the valve body is disposed at a position facing the valve body, contacts the valve body to close the flow path, and separates from the valve body to open the flow path. And a valve seat
And Luso solenoids generate a magnetic force by energizing the coil,
An urging mechanism for urging the valve body toward the valve seat,
A permanent magnet is arranged at a position facing the valve seat in the valve body ,
The solenoid causes the valve body and the valve seat to contact each other by generating an attractive magnetic force that attracts the permanent magnet by energizing the coil, and the fluid from the valve seat to the valve body A control valve that separates the valve body from the valve seat by generating a repulsive magnetic force that repels the permanent magnet by energizing the coil in a direction opposite to the energization in a state where pressure is applied . 2. The control valve according to claim 1 , wherein energization in the reverse direction to the coil is stopped after a lapse of a predetermined time from the start of energization in the reverse direction to the coil of the solenoid that generates the repulsive magnetic force. The solenoid has a core made of a metallic material, wherein the valve seat is formed on an upper surface of the core, control valve according to claim 1 or 2 is disposed at a position where the permanent magnet is opposed to said valve seat . The solenoid has a yoke located on the outer periphery of the core and core made of metal material, the valve seat is formed on the upper surface of the front Kiko A,
The permanent magnet, before control valve according to claim 1 or 2 is arranged in a position facing Kiyo over click.

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