JPH07174257A - Valve device - Google Patents

Abstract

PURPOSE:To buffer striking shock with an energizing means to reduce a striking sound generating when a valve body strikes against a valve seat on closing a valve by slidably inserting the valve body in a valve shaft and fixing the shaft so as to energize the valve body in the direction of the valve seat with the energizing means. CONSTITUTION:In an air conditioner for a vehicle, a valve device 26 installed in a warm water circulation line in which engine cooling water is circulated is constituted as a four-way directional control valve using an electromagnet 30 as a driving means, and first and second valve bodies 32a, 32b made of heat resistant rubber are fixed to a valve shaft 31 which is a plunger of the electromagnet 30 Passing through/cut-off of first and second inflow ports 34, 35 to first and second outflow ports 36, 37 is switched by the shaft direction displacement of the valve bodies 32a, 32b. On this case belleville springs 57a, 57b serving as an energizing means which energizes the valve bodies 32a, 32b in the direction of valve seats 38, 39 are installed in a valve shaft 31 between the valve bodies 32a, 32b. Shock caused by striking of the valve bodies 32a, 32b against the valve seats 38, 39 is reduced.

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 reducing impact noise when a valve body collides with a valve seat when the valve is closed.

[0002]

2. Description of the Related Art Conventionally, as means for opening and closing a flow path,
Solenoid valves are often used. This solenoid valve uses an electromagnet as a means for driving the valve body housed in the valve case, and a rubber valve body is attached and fixed to the plunger of this electromagnet, and by turning on / off the power supply to the electromagnet, The valve body is moved integrally with the plunger between the valve closing position and the valve opening position to open and close the flow path.

[0003]

In the above-mentioned conventional structure, when the valve is closed, the valve body momentarily moves from the valve open position to the valve close position, so that the valve body vigorously collides with the valve seat. In general, the valve body is made of rubber in consideration of the sealing property (adhesion with the valve seat), so the shock absorbing action at the time of valve closing can be expected a little due to the cushioning effect of the rubber itself.
The degree is not enough, and there is a drawback that the collision noise of the valve body becomes loud when the valve is closed.

To solve this problem, it is conceivable to reduce the impact load when the valve body collides with the valve seat when the valve is closed as follows. In the normally open valve device, the electromagnetic force of the electromagnet is reduced. In the normally closed valve device, the spring force of the return spring that returns the valve element to the closed position when the valve is closed is reduced. Lighten the load on moving parts such as the valve and plunger so that they can be opened and closed with a small driving force.

However, in any of these methods,
The force that presses the valve body against the valve seat during valve closing decreases, the valve sealability deteriorates, and leakage during valve closing increases.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a valve device capable of reducing the collision noise of the valve body when the valve is closed without impairing the valve sealing property. To do.

[0007]

In order to achieve the above object, a valve device of the present invention comprises a valve shaft, a valve element slidably inserted in the valve shaft, and a valve element opposed to the valve element. A valve seat provided, an urging means attached to the valve shaft for urging the valve body toward the valve seat, and a valve closing position of the valve shaft where the valve body is in close contact with the valve seat. And a driving means that is driven between the valve opening position and the valve opening position.

[0008]

According to the above structure, since the valve element is biased toward the valve seat by the biasing means, when the valve element collides with the valve seat when the valve is closed, the biasing means causes the impact force of the collision. Play a role in buffering. Therefore, the driving force of the driving means that drives the valve shaft (the force that presses the valve body against the valve seat during valve closing) is kept at a level that does not impair the valve sealability, while the valve body is closed. The impact noise can be reduced by the buffering effect of the biasing means.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to an automobile air conditioner will be described below with reference to the drawings. First, the schematic configuration of the entire automobile air conditioner will be described with reference to FIG. On the upstream side of the blower duct 11, there are provided an outside air suction port 12 for sucking in air outside the vehicle (outside air) and an inside air suction port 13 for sucking in air inside the vehicle (inside air). An inside / outside air damper 14 is provided at an intermediate portion between the outside air inlet 12 and the inside air inlet 13, and the inside / outside air damper 1 is provided.
By driving 4 by a servo motor (not shown), the outside air inlet 12 and the inside air inlet 13 are opened and closed. A blower 15 is provided on the downstream side of the inside / outside air damper 14, and an evaporator 16 is installed on the downstream side of the blower 15. Further, a heater core 17 is installed on the downstream side of the evaporator 16 so that all the wind that has passed through the evaporator 16 passes through the heater core 17. On the downstream side of the heater core 17,
Three outlets 18, 1 for DEF, FACE and FOOT
9, 20 are provided, and these blower outlets 18, 19, 20 are provided.
The opening is adjusted by the dampers 21 and 22.

The evaporator 16 described above is the engine 1
A refrigeration cycle is composed of a compressor having 0 as a drive source, a condenser, a receiver, and an expansion valve (all not shown), and cools / dehumidifies the air passing through the evaporator 16. On the other hand, the heater core 17 is connected to a hot water circulation circuit 25 in which hot engine cooling water is circulated from the engine cooling system 23. In this hot water circulation circuit 25, a valve device 26
A pump 27 is provided, and a pump 28 and a radiator 29 are connected to the engine cooling system 23.

As shown in FIG. 1, the valve device 26 is constructed as a four-way switching valve having an electromagnet 30 as a driving means, and a plunger of the electromagnet 30 is a valve shaft 31. First and second valve bodies 32a and 32b made of heat resistant rubber (for example, EPDM rubber) are attached to the valve shaft 31 (a mounting structure of both valve bodies 32a and 32b will be described later). The valve case 33 accommodating both the valve bodies 32a and 32b includes a first and second inflow ports 34 and 35, first and second outflow ports 36 and 37, and first and second valve seats 3
8, 39 are formed.

Further, the upper and lower parts of the valve shaft 31 are
Beroflams 40 and 41, which are diaphragm-shaped sealing members made of heat-resistant rubber (for example, EPDM rubber), are fixed via sealing metal fittings 45 and 46, respectively. The upper bellows 40 is fixed to the upper part of the valve case 33 via the collar 42, and plays a role of preventing water from entering the inside of the electromagnet 30 fixed above the valve case 33. Further, the lower bellows 41 is provided with a cover 43 on the lower portion of the valve case 33.
Fixed by the bellows 41 in this cover 43
A closed space partitioned by is formed. This cover 4
The space inside 3 is communicated with the space inside the electromagnet 30 through a through hole 44 formed in the axial center of the valve shaft 31. The through hole 44 of the valve shaft 31 plays a role of circulating the air inside the electromagnet 30 and the air inside the cover 43 according to the deformation of the bellows 40 and 41 at the time of valve opening / closing, thereby balancing the internal pressures of both. Allows smooth operation when opening and closing the valve. Further, the cover 43 has a valve shaft 3
A cylindrical shaft receiving portion 43a that slidably fits and supports the lower end portion of 1 is formed.

On the other hand, inside the electromagnet 30, a solenoid coil 47 and a return spring 48 for urging the valve shaft 31 upward are provided, and a downward electromagnetic force generated by energization of the solenoid coil 47 and a return spring. The resultant force with the upward spring force of 48 is that both valve bodies 32a, 32
It becomes the driving force for driving b.

In this embodiment, the first valve body 32a is a normally closed type valve and the second valve body 32b is a normally open type valve. When the electromagnet 30 is de-energized, the return spring 48 has an elastic force. The valve shaft 31 is urged upward by the first valve body 32a.
Closes the first valve seat 38 and the second valve body 32b
Opens the second valve seat 39. As a result, the engine cooling water that flows out of the heater core 17 and flows in the outward path 49 (see FIG. 3) flows from the first inflow port 34 to the first outflow port 36, and at the same time, the engine cooling that is heated by the engine 10 and flows in the return path 50 is performed. Water flows from the second inflow port 35 to the second outflow port 37.

On the other hand, the solenoid coil 47 of the electromagnet 30
When the solenoid valve is energized, the electromagnetic force urges the valve shaft 31 downward, so that the first valve body 32a opens the first valve seat 38 and the second valve body 32b opens the second valve seat 39. To close. This causes the heater core 17 to move out of
A part of the engine cooling water flowing through flows through the first valve seat 38 to the second valve body 32b side, and returns from the second outlet 37 to the heater core 17 side through the return path 50. .

In this embodiment, the valve device 46 adjusts the duty ratio of the on / off of the electromagnet 30 by the drive control circuit 52 (see FIG. 3), so that the valve device 46 passes through the first valve seat 38 and the second valve seat 38. The temperature of the engine cooling water supplied to the inside of the heater core 17 is adjusted by changing the mixing ratio of the engine cooling water after the heat is diverted to the valve body 32b side and the high temperature engine cooling water flowing from the engine 10 side.

Next, referring to FIG. 2, both valve bodies 32a, 32
The mounting structure of b will be described. Both valve bodies 32a, 32b are fixed to the tubular support bodies 55a, 55b with a collar by adhesion or the like, and the tubular support bodies 55a, 55b with a collar are attached to the valve shaft 3 respectively.
1 is slidably inserted. This valve shaft 3
1, ring-shaped stoppers 56a and 56b for preventing both valve bodies 32a and 32b from being pulled out are fitted and fixed.
Further, on the valve shaft 31, each valve element 32a, 32b is provided.
The first and second disc springs 57a and 57b serve as urging means for urging the valve seats 38 and 39 toward the valve seats 32 and 39, respectively.
It is fitted and mounted so as to be located between a and 32b.
The inner peripheral end portions of the disc springs 57a and 57b are the valve shaft 3
1 is supported by a collar portion 58 formed on the outer periphery of the valve body 32, and the outer peripheral end portions of the valve body 32a, 32b are brought into contact with the flanged cylindrical support bodies 55a, 55b to move the valve bodies 32a, 32b toward the valve seats 38, 39. I am biased.

2A shows the state when the electromagnet 30 is disconnected, FIG. 2B shows the state when the electromagnet 30 is energized, and FIG. 2C shows the valve closing / opening. It shows a state in the middle of operation. When the electromagnet 30 is cut off, the return spring 4
The valve shaft 31 is urged upward by the elastic force of 8,
As shown in FIG. 2A, the first valve body 32a closes the first valve seat 38, and the second valve body 32b opens the second valve seat 39. In this state, the first valve seat 32 relatively pushes down the first valve body 32a, and the first disc spring 57a is compressed. Further, the second valve body 32b is in the original position (position in contact with the stopper 56b) by the elastic force of the second disc spring 57b in the process of opening.
It returns to the state.

On the other hand, the solenoid coil 47 of the electromagnet 30
When the valve element 31 is energized, the electromagnetic force urges the valve shaft 31 downward, and as shown in FIG.
2a opens the first valve seat 38 and the second valve body 3
2b closes the second valve seat 39. In this state, the second
The second valve body 32b is relatively pushed up by the valve seat 39 and the second disc spring 57b is compressed. Further, the first valve body 32a returns to the original position (the position where it comes into contact with the stopper 56a) by the elastic force of the first disc spring 57a in the process of opening.

In this case, either of the valve bodies 32a, 32b
Also, since the disc springs 57a and 57b are biased toward the valve seats 38 and 39, when the valve bodies 32a and 32b collide with the valve seats 38 and 39 at the time of valve closing, the disc springs 57a and 57b are closed.
Is compressed and deformed, the impact force of the collision is effectively buffered, and the collision noise of the valve bodies 32a and 32b when the valve is closed is reduced. In addition, the electromagnetic force of the electromagnet 30 that drives the valve shaft 31 (the force that presses the valve bodies 32a and 32b against the valve seats 38 and 39 during valve closing) is reduced while achieving such noise reduction.
The valve sealability can be maintained at a size that does not impair the valve sealability (that is, a size equal to or larger than the conventional size), and the valve sealability can be maintained.

In the above embodiment, the valve bodies 32a and 32b are provided.
Although the disc springs 57a and 57b are used as the urging means for urging the valve seats 38 and 39 toward the valve seats 38 and 39, other springs such as coil springs or elastic bodies other than springs such as rubber are used. You may do it.

Further, in the above embodiment, both valve bodies 32a, 3
Two disc springs 57a and 57b are interposed between 2b, but one coil spring or other urging means is interposed between both valve bodies 32a and 32b, and one urging means is used for two valves. The bodies 32a and 32b may be biased. Further, in the above-described embodiment, the electromagnet 30 is used as the driving means, but other electrically driven actuators such as a motor may be used, or an actuator using air pressure, hydraulic pressure or the like as a drive source may be used.

In the above embodiment, one electromagnet 30 is used.
Although the two valve bodies 32a and 32b are driven by the (driving means), one driving means drives one valve body, or one driving means drives three or more valve bodies. You may do it. Further, it goes without saying that the internal configuration of the valve device may be changed as appropriate according to the type of system in which the valve device of the present invention is incorporated.

In addition, the present invention is not limited to the valve device of the air conditioner for automobiles, and can be widely applied to various valve devices requiring noise countermeasures, and various modifications can be made without departing from the scope of the invention. It goes without saying that it can be carried out.

[0025]

As is apparent from the above description, according to the valve device of the present invention, the valve body is slidably inserted into the valve shaft, and the valve body is biased toward the valve seat by the biasing means. Since it is attached to the shaft as described above, when the valve body collides with the valve seat when the valve is closed, the biasing means plays a role of buffering the impact force of the collision, and the valve body of the valve body when closed is closed. The collision noise can be reduced. Moreover, while achieving such noise reduction, the driving force of the driving means that drives the valve shaft (the force that presses the valve body against the valve seat during valve closing) is large enough not to impair the valve sealability ( In other words, it can be maintained at a size equal to or larger than that of the conventional one, and the valve sealability is not impaired.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a valve device showing an embodiment of the present invention.

FIG. 2A is a sectional view of a valve body peripheral portion showing a position of the valve body when the electromagnet is disconnected, and FIG. 2B is a sectional view of a valve body peripheral portion showing a position of the valve body when the electromagnet is energized. , (C) is a cross-sectional view of the valve body peripheral portion showing a state during the valve closing / opening operation.

FIG. 3 is a diagram showing a configuration of a hot water circulation circuit.

[Explanation of symbols]

16 ... Evaporator, 17 ... Heater core, 25 ... Hot water circulation circuit, 26 ... Valve device, 29 ... Radiator, 30 ... Electromagnet (driving means), 31 ... Valve shaft, 32a ... First valve body, 32b ... Second valve Body, 33 ... Valve case, 38 ... First
Valve seat, 39 ... second valve seat, 40, 41 ... bellofram,
43 ... Cover, 44 ... Through hole, 47 ... Solenoid coil, 48 ... Return spring, 56a, 56b ... Stopper, 57a, 57b ... Disc spring (biasing means).

Claims (1)

[Claims] 1. A valve shaft, a valve body slidably inserted in the valve shaft, a valve seat provided so as to face the valve body, and a valve body attached to the valve shaft, Urging means for urging in the direction of the valve seat, and drive means for driving the valve shaft between a valve closing position where the valve element is in close contact with the valve seat and an valve opening position distant therefrom. Valve device.