JP4629709B2 - Bidirectional solenoid valve - Google Patents

Description

  The present invention relates to a bidirectional solenoid valve, for example, a bidirectional solenoid valve used in an air conditioner having a cycle dry (dehumidification) mode.

As an air conditioner that can perform dehumidifying operation, the indoor exchanger is divided into two, and a throttle is provided between the two indoor exchangers. During dehumidifying operation, the refrigerant flows through the throttle, so that the indoor replacement is divided into two. The upstream indoor exchanger is a condenser, the downstream indoor exchanger is an evaporator, the indoor air is cooled and dehumidified by the downstream indoor exchanger, and the upstream indoor exchanger is used. There is known an air conditioner that can perform heating and dehumidification without lowering the temperature. This type of air conditioner is disclosed in the following publications and the like.
Japanese Patent Laid-Open No. 2-183776 JP-A-7-91778 (Patent No. 30477702) JP 11-51514 A

  A conventionally known solenoid valve for cycle drying used in an air conditioner that can perform cycle drying (dehumidification) without lowering the temperature, that is, a bidirectional solenoid valve, is a refrigerant for the valve body in the cooling mode. Since the pressure acts in the valve closing direction, the valve closing state is maintained without requiring a large valve closing force, but in the heating mode by the heat pump, the refrigerant is in the opposite direction to the cycle drying electromagnetic valve in the cooling mode. Since the refrigerant pressure acts on the valve body in the valve opening direction, the valve closed state cannot be maintained unless a large valve closing force is applied.

  For this reason, in the conventional system, a heating cycle dry mode is performed in which dehumidification is performed in the heating mode for removing or preventing condensation on the window glass and the wall surface during heating or drying the laundry indoors. I can't.

The present invention has been made to solve the above-described problems, and stabilizes the valve closed state in both the cooling mode and the heating mode, that is, even if the flow direction of a fluid such as a refrigerant is reversed. The object is to provide a bidirectional solenoid valve that can be maintained.
Another object of the present invention is to provide a normally open type power saving bidirectional solenoid valve.

In order to achieve the above object, a bidirectional solenoid valve according to the present invention is a bidirectional solenoid valve capable of maintaining a valve closed state in a mode in which a fluid flows in any direction, and is a first inlet / outlet port. And a second inlet / outlet port, a valve port is provided on the second inlet / outlet port side, a main valve body is provided in a valve chamber formed on the first inlet / outlet port side, the valve seat is provided is defined around the valve port, the main valve body, a plunger for driving between the valve-open position in which one end is away from said valve seat and valve-closed position seated on the valve seat of its wherein, of said plunger one end linked electromagnetic drive means is provided on the other end of the main valve body, the plunger on the other end side of the back is closed valve maintaining a pressure chamber defined in the previous SL second The fluid pressure passage for introducing the fluid pressure on the inlet / outlet port side into the pressure chamber for maintaining the valve closed is provided in front. Formed through its valve lift direction to the main valve body,
When the main valve body moves away from the valve seat in order to move from the valve closed position to the valve open position, the movement of the main valve body is not prevented by the fluid pressure in the valve closing maintenance pressure chamber. A bleed hole for releasing the fluid pressure in the plunger of the pressure chamber for maintaining the valve closing is formed in the plunger, and the flow rate of the fluid flowing through the bleed hole is smaller than the flow rate flowing through the fluid pressure passage. is there.

According to this configuration, in the mode in which fluid flows from the first inlet / outlet port to the second inlet / outlet port, the fluid pressure is maintained in the valve chamber in the state where the main valve body is in the valve closed position. Acts directly on the body in the valve closing direction. On the other hand, in the mode in which the fluid flows from the second inlet / outlet port to the first inlet / outlet port, the fluid pressure is controlled by the valve against the main valve body when the main valve body is in the valve closed position. Although acting directly in the opening direction, the fluid pressure passage introduces the fluid pressure on the second inlet / outlet port side into the valve closing maintaining pressure chamber, and the fluid pressure introduced into the valve closing maintaining pressure chamber is the main valve body. Against the valve closing direction. Accordingly, in any mode in which the fluid flows in any direction, the valve closed state in which the main valve body is located at the valve closed position is stably maintained. Further, since the bleed hole is formed, when the energization of the electromagnetic solenoid device 20 is stopped, the separation from the attractor 22 due to the spring force of the internal spring 28 of the plunger 23 that is magnetically attracted is maintained to keep the valve closed. It is no longer blocked by the fluid pressure in the pressure chamber 30 for use.

  In order to achieve the above-mentioned object, the bidirectional solenoid valve according to the present invention is energized so as to close the fluid pressure passage in the middle of the fluid pressure passage, and is fluid on the second inlet / outlet port side. A sub-valve element that is opened when pressure is applied is provided.

  According to this configuration, in the mode in which fluid flows from the first inlet / outlet port to the second inlet / outlet port, the fluid pressure is maintained in the valve chamber in the state where the main valve body is in the valve closed position. Acts directly on the body in the valve closing direction. On the other hand, in the mode in which the fluid flows from the second inlet / outlet port to the first inlet / outlet port, the fluid pressure is controlled by the valve with respect to the main valve body when the main valve body is in the valve closed position. Although acting directly in the opening direction, the sub-valve element provided in the fluid pressure passage opens by the fluid pressure on the second input / output port side, and the second inlet / outlet port is connected to the valve closing maintenance pressure chamber. Side fluid pressure is introduced, the fluid pressure introduced into the valve closing maintenance pressure chamber acts on the main valve body in the valve closing direction, and the valve in which the main valve body is located in the valve closed position in any mode. The closed state is maintained stably. In the bidirectional solenoid valve according to the present invention, the fluid pressure passage is formed so as to penetrate the main valve body in the valve lift direction, and the sub-valve body is incorporated in the main valve body. Therefore, a miniaturized design is possible.

  Furthermore, in the bidirectional solenoid valve according to the present invention, the electromagnetic drive means is constituted by an electromagnetic solenoid device including an internal spring, and the main valve body is driven to the valve open position by the spring force of the internal spring when not energized. When energized, the main valve element can be driven to the valve closed position against the spring force of the internal spring, and the power consumption can be reduced.

As understood from the above description, according to the bidirectional solenoid valve of the present invention, in the mode in which fluid flows from the first inlet / outlet port to the second inlet / outlet port, the main valve body is in the valve closed position. In this state, the fluid pressure directly acts on the main valve body in the valve closing direction in the valve chamber.
On the other hand, in the mode in which fluid flows from the second inlet / outlet port to the first inlet / outlet port, the fluid pressure is controlled relative to the main valve body when the main valve body is in the valve closed position. Although acting directly in the opening direction, the fluid pressure on the second inlet / outlet port side is introduced into the valve closing maintaining pressure chamber through the fluid pressure passage, and the fluid pressure introduced into the valve closing maintaining pressure chamber is the main valve. Acts in the valve closing direction on the body. Therefore, in any mode, that is, even if the flow direction of the fluid is reversed, the valve closed state is stably maintained without requiring another electromagnetic actuator or the like. In addition, because the bleed hole for releasing the pressure inside the plunger is formed, when the electromagnetic solenoid device is de-energized, the plunger is separated from the attractor due to the spring force of the plunger's internal spring. It is no longer blocked by the fluid pressure in the pressure chamber.

  Further, according to the bidirectional solenoid valve of the present invention, in the state where the main valve body is in the valve closed position, the fluid pressure directly acts on the main valve body in the valve opening direction. The valve opens, the fluid pressure on the second inlet / outlet port side is introduced into the valve closing maintenance pressure chamber, and the fluid pressure introduced into the valve closing maintenance pressure chamber is in the valve closing direction with respect to the main valve body Therefore, even in any mode, that is, even if the flow direction of the fluid is reversed, the valve closed state is stably maintained without requiring another electromagnetic actuator or the like, so that the power consumption is reduced. be able to.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 shows an embodiment of a bidirectional solenoid valve according to the present invention. The bidirectional solenoid valve is generally indicated by reference numeral 10 and has a valve housing 11 made of metal or the like.

  The valve housing 11 includes a valve chamber 14 and a valve formed between the first inlet / outlet port 12, the second inlet / outlet port 13, and the first inlet / outlet port 12 and the second inlet / outlet port 13. Port 15. An annular valve seat 16 is defined around the valve port 15, and a relief groove 17 that cooperates with a later-described main valve body 18 to define a throttle passage is formed in the valve seat circumferential direction. Are provided at a plurality of locations.

  The valve chamber 14 is on the first inlet / outlet port 12 side, and a main valve body 18 is provided in the valve chamber 14 so as to be movable in the vertical direction (valve lift direction) in the drawing. The main valve body 18 is seated on a valve seat portion 16 defined around the valve port 15, and a valve closed position for obtaining a throttle state in which a flow of a minute flow rate is ensured by the escape groove 17 (see FIGS. 3 and 4). And a valve open position (see FIG. 1 and FIG. 2) that is distant from the valve seat portion 16.

  An electromagnetic solenoid device 20 is attached to the valve housing 11. The electromagnetic solenoid device 20 is provided in a plunger tube part 21 integrally formed on the upper part of the valve housing 11, an attractor 22 fixed to the bottom part in the plunger tube part 21, and movable in the plunger tube part 21. A plunger 23, a coil guide member 24 attached to the upper end portion of the plunger tube portion 21, an electromagnetic coil portion 26 and an outer casing 27 provided on the outer side of the plunger 23 and fixed to the coil guide member 24 by a bolt 25, An internal spring 28 provided between the suction element 22 and the plunger 23 and a stop ring 29 provided on the plunger 23 are provided.

  The stem portion 19 of the main valve body 18 passes through the suction element 22 and is caulked and joined to the plunger 23 at the upper end portion 19a. As a result, the electromagnetic solenoid device 20 drives the main valve body 18 upward (in the valve opening direction) together with the plunger 23 by the spring force of the internal spring 28 when the electromagnetic coil portion 26 is not energized. On the other hand, when the electromagnetic coil portion 26 is energized, the plunger 23 is magnetically attracted toward the attractor 22 against the spring force of the internal spring 28, thereby lowering the main valve body 18 downward. Drive to (valve closing direction).

  That is, the electromagnetic solenoid device 20 drives the main valve body 18 to the valve open position away from the valve seat portion 16 by the spring force of the internal spring 28 when not energized, and resists the spring force of the internal spring 28 when energized. It is a normally open type in which the valve body 18 is seated on the valve seat portion 16 and driven to a valve closed position to obtain a throttle state in which a flow of a minute flow rate is ensured by the escape groove 17.

  The plunger 23 has a cup shape and defines a valve closing maintaining pressure chamber 30 between the plunger 23 and the coil guide member 24 on the back side. A seal ring 31 is attached to the outer periphery of the plunger 23 in order to obtain the airtightness of the valve closing maintaining pressure chamber 30. The effective diameter of the plunger 23 in the valve closing maintaining pressure chamber 30 is larger than the effective diameter of the valve port 15, and the fluid pressure introduced into the valve closing maintaining pressure chamber 30 positions the main valve body 18 in the valve closing position with respect to the plunger 23. Acts in the direction of biasing.

  An internal passage (fluid pressure passage) 32 communicating with the valve closing maintaining pressure chamber 30 is formed through the main valve body 18 in the valve lift direction. The internal passage 32 opens toward the second inlet / outlet port 13 by an opening 33 at the bottom of the main valve body facing the second inlet / outlet port 13 on the lower end side.

  The internal passage 32 is provided with a ring-shaped valve seat member 34, a sub-valve body 35 that cuts off the communication of the internal passage 32 by being separated from the valve seat member 34, and a sub-valve body 35 in the valve closing direction. A biasing valve closing spring 36 is incorporated. In the state where the main valve body 18 is in the valve-closed state, the sub-valve element 35 is subjected to the fluid pressure on the second inlet / outlet port 13 side in the valve opening direction, and is opened by this fluid pressure. When the auxiliary valve body 35 is opened, the internal passage 32 is brought into communication with the valve seat member 34, the gap between the auxiliary valve body 35 and the internal passage 32, and the holes 35a and 35b formed in the auxiliary valve body 35. Become.

  The plunger 23 is formed with a bleed hole 37 for releasing a plunger internal pressure as a general electromagnetic valve. By forming the bleed hole 37, when the energization of the electromagnetic solenoid device 20 is stopped, the separation from the attractor 22 due to the spring force of the internal spring 28 of the plunger 23 that is magnetically attracted is for maintaining the valve closed. It is no longer blocked by the fluid pressure in the pressure chamber 30. The bleed hole 37 has a bleed flow rate smaller than the flow rate of the fluid flowing through the internal passage 32 in a state where the sub-valve element 35 is opened so that the valve closing maintaining pressure chamber 30 operates effectively. The caliber is set.

Next, the operation of the bidirectional solenoid valve 10 configured as described above will be described.
(Mode in which fluid (refrigerant) flows from the first inlet / outlet port 12 toward the second inlet / outlet port 13 (cooling mode)) When the electromagnetic solenoid device 20 is not energized, FIG. 1 and FIG. 2, the main valve body 18 is lifted together with the plunger 23 by the spring force of the internal spring 28 of the electromagnetic solenoid device 20, and is separated from the valve seat portion 16, so that there is no substantial throttling operation. A state is obtained.

  When the electromagnetic solenoid device 20 is energized, the plunger 23 is magnetically attracted toward the attractor 22 against the spring force of the internal spring 28, as shown in FIG. Driven in the valve closing direction, the main valve body 18 is seated on the valve seat portion 16. In this valve closed state, a throttling state is ensured by the escape groove 17 so as to ensure a flow of a minute flow rate. In this valve closed state, the primary pressure flowing into the valve chamber 14 from the first inlet / outlet port 12 acts on the main valve body 18 in a direction in which it is pressed against the valve seat portion 16, and the main valve body 18 The valve closed state is maintained stably.

  In this valve closed state, the second inlet / outlet port 13 side is in a low pressure state (secondary pressure) on the downstream side, so the sub-valve element 35 does not open and is necessary. Nor.

  (Mode in which fluid (refrigerant) flows from the second inlet / outlet port 13 toward the first inlet / outlet port 12 (heating mode)) When the electromagnetic solenoid device 20 is not energized, FIG. 1 and FIG. 2, the main valve body 18 is lifted together with the plunger 23 by the spring force of the internal spring 28 of the electromagnetic solenoid device 20, and is separated from the valve seat portion 16, so that there is no substantial throttling operation. A state is obtained.

  When the electromagnetic solenoid device 20 is energized, the plunger 23 is magnetically attracted toward the attractor 22 against the spring force of the internal spring 28 as shown in FIG. Driven in the valve closing direction, the main valve body 18 is seated on the valve seat portion 16. In this valve closed state, a throttling state is ensured by the escape groove 17 so as to ensure a flow of a minute flow rate.

  In this valve closed state, the primary pressure of the second inlet / outlet port 13 acts on the main valve body 18 in the valve opening direction, but the valve closed state is stably maintained in this case also by the following operation.

  When the main valve body 18 is seated on the valve seat portion 16, the fluid pressure of the second inlet / outlet port 13 acts on the sub-valve body 35, and the sub-valve body 35 opens the valve against the spring force of the valve closing spring 36. As a result, the communication of the internal passage 32 is established. As a result, the primary pressure of the second inlet / outlet port 13 enters the pressure chamber 30 for maintaining the valve closing, the primary pressure acts on the plunger 23 in the valve closing direction, and the main valve body 18 is pressed against the valve seat portion 16. Thus, the valve closed state of the main valve body 18 is stably maintained.

  FIG. 5 shows an embodiment of an air conditioner according to the present invention. This air conditioner includes a compressor 50, an outdoor heat exchanger 51, a first indoor exchanger 52, a second indoor heat exchanger 53, refrigerant passages 55 to 63 that connect them in a loop, An expansion valve 54 provided in the refrigerant passage (57, 58, 59) between the heat exchanger 51 and the first indoor exchanger 52, and a refrigerant connected in a loop for switching between the cooling mode and the heating mode And a four-way valve 64 for reversing the flow direction of the refrigerant in the passages 55 to 63.

  The bidirectional solenoid valve 10 having the above-described configuration is connected to the refrigerant passage 60 between the first indoor exchanger 52 and the second indoor heat exchanger 53. In this case, the first inlet / outlet port 12 of the bidirectional solenoid valve 10 is connected to the outlet side of the first indoor exchanger 52, and the second inlet / outlet port 13 is the inlet of the second indoor heat exchanger 53. Connected to the side.

  In the cooling mode, the refrigerant circulates in the direction indicated by the arrow in FIG. At this time, in the bidirectional solenoid valve 10, the refrigerant flows from the first inlet / outlet port 12 toward the second inlet / outlet port 13, and the bidirectional solenoid valve 10 is opened in the cooling state. When the mode is obtained and the bidirectional solenoid valve 10 is closed, the bidirectional solenoid valve 10 acts as a throttle valve, and a cooling cycle dry mode (dehumidification during cooling) is obtained.

  In the heating mode, the refrigerant circulates in the direction opposite to the direction indicated by the arrow in FIG. At this time, in the bidirectional solenoid valve 10, the refrigerant flows from the second inlet / outlet port 13 toward the first inlet / outlet port 12, and the bidirectional solenoid valve 10 is opened in the heating state. When the mode is obtained and the bidirectional solenoid valve 10 is closed, the bidirectional solenoid valve 10 acts as a throttle valve, and a heating cycle dry mode (dehumidification during heating) is obtained.

  In the heating cycle dry mode, as described above, the primary pressure appearing at the second inlet / outlet port 13 acts on the main valve body 18 of the bidirectional solenoid valve 10 in the valve opening direction. As a result, the sub-valve element 35 opens, the primary pressure of the second inlet / outlet port 13 enters the valve closing maintaining pressure chamber 30, and the valve closing state of the main valve element 18 is stably maintained. Thereby, the heating cycle dry mode can also be obtained stably.

  1 is replaced with a capillary tube 65 that replaces the throttling function of the escape groove 17 on the refrigeration cycle of the air conditioner, as shown in FIG. You may make it connect in parallel.

It is sectional drawing which shows one Embodiment of the bidirectional | two-way type | mold solenoid valve by this invention. It is sectional drawing which shows the main valve body valve open state of the bidirectional | two-way type solenoid valve by this invention. It is sectional drawing which shows the main valve body valve closed state at the time of the air conditioning dry of the bidirectional | two-way type solenoid valve by this invention. It is sectional drawing which shows the main valve body valve closed state at the time of the heating dry of the bidirectional | two-way type solenoid valve by this invention. It is a block diagram which shows one embodiment of the air conditioner by this invention. It is a block diagram which shows other embodiment of the air conditioner by this invention.

Explanation of symbols

10, 10 ′ Bidirectional solenoid valve 11 Valve housing 12 First inlet / outlet port 13 Second inlet / outlet port 14 Valve chamber 15 Valve port 16 Valve seat portion 17 Escape groove 18 Main valve body 20 Electromagnetic solenoid device 23 Plunger 26 Electromagnetic coil section 28 Internal spring 30 Pressure chamber for maintaining valve closed 32 Internal passage (fluid pressure passage)
35 Sub-valve body 50 Compressor 51 Outdoor heat exchanger 52 First indoor exchanger 53 Second indoor heat exchanger 55-63 Refrigerant passage 64 Four-way valve

Claims (3)

A bidirectional solenoid valve capable of maintaining the valve closed state in a mode in which fluid flows in any direction,
A first inlet / outlet port and a second inlet / outlet port; a valve port provided on the second inlet / outlet port side; and a main valve in a valve chamber formed on the first inlet / outlet port side A body is provided,
The valve seat is provided is defined around the valve port, a plunger for driving the main valve body, between a valve-open position in which one end is away from said valve seat and valve-closed position seated on the valve seat of its Including an electromagnetic drive means in which one end side of the plunger is connected to the other end of the main valve body, and a valve closing maintaining pressure chamber is defined on the back of the other end side of the plunger,
Formed fluid pressure passage for introducing the fluid pressure of the front SL side of the second inlet and outlet ports in the valve closed maintaining pressure chamber penetrates into the valve lift direction to the main valve body,
When the main valve body moves away from the valve seat in order to move from the valve closed position to the valve open position, the movement of the main valve body is not prevented by the fluid pressure in the valve closing maintenance pressure chamber. A bleed hole for fluid pressure release in the plunger of the pressure chamber for maintaining the valve closed is formed in the plunger,
The bidirectional solenoid valve characterized in that the flow rate of the fluid flowing through the bleed hole is less than the flow rate of flowing through the fluid pressure passage . A sub-valve element that is energized to close the fluid pressure passage in the middle of the fluid pressure passage and is opened by applying a fluid pressure on the second inlet / outlet port side;
In a state where the main valve body is in the valve closed position, the first inlet port is connected to the first inlet / outlet port.
2. The bidirectional type according to claim 1, wherein the sub-valve element is opened by the fluid pressure on the second inlet / outlet port side when the fluid flows toward the inlet / outlet port of the second inlet / outlet port. solenoid valve. The electromagnetic driving means is constituted by an electromagnetic solenoid device including an internal spring, which drives the main valve body to the valve open position by a spring force of the internal spring when not energized, and resists the spring force of the internal spring when energized. The bidirectional solenoid valve according to claim 1 or 2, wherein the main valve body is of a normally open type for driving the valve body to the valve closed position.

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