JP2011153700A - Fluid control valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid control valve which holds a valve part in an opened state by a simple structure in the fluid control valve which is arranged in a flow passage in which fluid flows and has the valve part which opens and closes the flow passage by being operated. <P>SOLUTION: The fluid control valve 100 comprises a holding means having a locking groove 70 which holds a valve body and fixes it in the opened state when the constantly closed valve body energized to the side of a closed valve by a coil spring 90 is operated in a direction in which the flow passage is opened by a prescribed amount and a locking claw 80 which is locked to the locking groove 70 formed at the side of a housing 10, locks the locking claw 80 to the locking groove 70 in the opened state, and keeps the opened state. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a fluid control valve that is disposed in a flow path through which a fluid flows and has a valve portion that opens and closes the flow path when activated.

  In Patent Document 1, a thermal expansion body that is disposed in a flow path through which a fluid flows and is accommodated in accordance with the temperature of the fluid expands to open the flow path, and the thermal expansion body contracts. 1 A valve mechanism for a fluid having a valve body that is energized by an elastic body and closes a flow path, wherein the valve body has an opening that is closed by engagement between a main body portion that accommodates a thermal expansion body and the main body portion. There is disclosed a fluid valve mechanism including a sealing valve having a second elastic body that opens an opening when the thermal expansion body leaks from the main body and the main body and the sealing valve are disengaged from each other.

JP 2005-256742 A

  However, in the fluid valve mechanism disclosed in Patent Document 1, the valve body is composed of a relatively movable main body and a sealing valve, so that the structure of the valve body is complicated. Moreover, since a valve body is provided with a 1st elastic body and a 2nd elastic body, there exists a problem from which a structure becomes complicated.

  This invention is made | formed in view of said problem, and makes it a subject to provide the fluid control valve which hold | maintains a valve part in an open state with a simple structure.

  In order to solve the above technical problem, the first technical means taken in the present invention has a valve portion that is disposed in a flow path through which a fluid flows and opens and closes the flow path when operated. The fluid control valve is a fluid control valve provided with holding means for holding the valve portion in an open state when the valve portion is operated in a direction to open the flow path by a predetermined amount.

  The second technical means according to claim 1, comprising a temperature sensing part that operates based on the temperature of the fluid and moves the valve part, and when the valve part moves in a direction to open the flow path by a predetermined amount, The valve portion is held in an open state.

  A third technical means is that, in claim 2, a heating element is provided in the temperature sensing part.

  A fourth technical means is that in any one of claims 1 to 3, the holding means is provided in a cap which is a separate member from the valve portion and is fixed to the valve portion. .

  A fifth technical means is that, in claim 1, the valve portion is rotatable, and is rotated to open and close the flow path.

  According to the first aspect of the present invention, since the valve portion is held in the open state only by the holding means, the valve portion can be held in the open state with a simple structure.

  According to invention of Claim 2, this invention is applicable to the fluid control valve which has a valve part controlled by the temperature sensing part which act | operates based on the temperature of the fluid.

  According to the invention of claim 3, the present invention can be applied to a fluid control valve in which a heating element is provided in the temperature sensing part.

  According to the fourth aspect of the present invention, the holding means is provided in a cap that is a separate member from the valve portion and is fixed to the valve portion, so that it is not necessary to provide a new valve portion.

  According to the invention of claim 5, the present invention can be applied to a fluid control valve having a rotatable valve portion.

1 is a schematic diagram showing an engine cooling circuit to which a fluid control valve according to the present invention is applied. Schematic which shows the valve closing state of the fluid control valve of a 1st Example. Schematic which shows the valve opening state of the fluid control valve of a 1st Example. Schematic which shows the abnormal state of the fluid control valve of a 1st Example. Schematic which shows the latching state of the fluid control valve of a 1st Example. The schematic of the fluid control valve which shows the modification of the latching structure shown in FIG. The flowchart which shows the control flow of the fluid control valve of a 1st Example. Schematic which shows the valve closing state of the fluid control valve which concerns on 2nd Example of this invention. Schematic which shows the valve opening state of the fluid control valve of a 2nd Example. Schematic which shows the latching state of the fluid control valve of a 2nd Example.

  A first embodiment of the present invention will be described below with reference to FIGS.

  FIG. 1 is a schematic diagram showing an engine cooling circuit C in which the fluid control valve 100 according to the first embodiment of the present invention is mounted. FIG. 2 is a schematic view showing a closed state of the fluid control valve 100 of the first embodiment. FIG. 3 is a schematic view showing a valve open state of the fluid control valve 100 of the first embodiment. FIG. 4 is a schematic diagram showing an abnormal state of the fluid control valve of the first embodiment. FIG. 5 is a schematic view showing a locked state of the fluid control valve of the first embodiment. FIG. 6 is a schematic view of a fluid control valve showing a modification of the locking structure. FIG. 7 is a flowchart showing a control flow of the fluid control valve of the first embodiment.

  The engine cooling circuit C includes an engine 1, a pump 2, a radiator 3, a thermostat 4, a vehicle compartment heater 5, and a fluid control valve 100. Cooling water (fluid) is circulated in the engine cooling circuit C by a pump 2 driven by the engine 1.

  The fluid control valve 100 and the vehicle compartment heater 5 are disposed (intervened) in a heater circuit (fluid flow path) C1 that communicates with the pump 2 substantially from the engine 1.

  The radiator 3 and the thermostat 4 are disposed in a radiator circuit C <b> 2 that communicates from the engine 1 to the pump 2. When the cooling water reaches a predetermined temperature after the engine 1 is started, the thermostat 4 is opened, and the cooling water circulates through the radiator 3 and dissipates heat from the radiator 3 to be cooled.

  The fluid control valve 100 has an inlet 11 on one end side, an outlet 12 on the other end side, and a partition wall 13 in which a through hole (flow path) 13a penetrating in the center is formed between the inlet 11 and the outlet 12. The housing 10 is provided. The cooling water flows from the inlet 11 to the outlet 12 through the through hole 13a.

  A cylindrical piston 20 that extends through the through hole 13a and protrudes is fixed in the housing 10. A heating element 60 that generates heat when current is supplied is provided at the tip of the piston 20. An electric wire 61 having one end for supplying a current to the heating element 60 connected to the heating element 60 is inserted into the piston 20 and led out of the housing 10.

  The other end of the electric wire 61 is connected to the driver 62, and the driver 62 is connected to the ECU 63. The driver 62 receives a control signal having a duty ratio from the ECU 63 and outputs (supplies) a current as an output signal having the same duty ratio as the control signal to the heating element 60 via the electric wire 61. Before and after the driver 62, a determination device 64 that detects the control signal and the output signal and determines whether the control signal and the output signal are the same is connected. A check engine lamp 65 that is turned on when the control signal and the output signal are not the same is connected to the determination device.

  A substantially bottomed cylindrical case 30 in which the piston 20 is inserted on one end side to form a space S is inserted on the tip end side of the piston 20 so as to be movable relative to the piston 20. The space S is filled with a thermally expandable wax W. The temperature sensing unit 50 is configured by the case 30 and the wax W, and the temperature sensing unit 50 is activated by the wax W being heated and expanded by the heating element 60 and the case 30 moving away from the piston 20. A wedge-shaped locking groove 70 is formed on the distal end side of the case 30. The wedge-shaped locking groove 70 includes an inclined surface 71 inclined toward the outer peripheral direction and toward the fixed side of the piston 20 and a locking surface 72 extending in the outer peripheral direction. The locking groove 70 may be provided on a part or the entire circumference of the case 30.

  On the opposite side of the housing 10 to the side on which the piston 20 is fixed, the piston 20 side tip is formed with a substantially J-shaped or L-shaped cross section or an acute angle, and the valve body 40 has a predetermined amount of through holes 13a. A locking claw (holding means) 80 that locks (holds) in the locking groove (holding means) 70 is fixed when moved (actuated) in the opening direction. The locking claw 80 can be deformed and is preferably formed from an elastic material. The predetermined amount is a movement amount (for example, a lift amount) that moves beyond the normal operation position of the valve body in the event of an abnormality.

  An annular valve body (valve portion) 40 having an outer diameter larger than the inner diameter of the through hole 13a and capable of opening and closing the through hole 13a is fixed to the outer periphery of the case 30 so as to be movable integrally with the case 30. .

  On the radially outer side of the case 30, one end engages with the valve body 40, the other end engages with the housing 10, and the coil spring 90 biases the valve body 40 toward the partition wall 13 so that the through hole 13a is closed. Is provided.

  Next, the operation of this embodiment will be described.

  When heating of the vehicle interior by the vehicle interior heater 5 is required, such as after startup when the engine 1 is cold, current is supplied to the heating element 60 by the electric wires 61 and the heating element 60 generates heat. Due to the heat generated by the heating element 60, the wax W in the space S of the case 30 is heated to rise in temperature and expand. A direction in which the case 30 moves relative to the piston 20 in a direction away from the piston 20 so that the space S expands due to the expansion of the wax W, and the valve body 40 fixed to the outer periphery of the case 30 moves away from the partition wall 13. 2 to the valve open state shown in FIG. 3 from the valve closed state shown in FIG. The through-hole 13a is opened by the movement of the valve body 40, and the cooling water can be circulated. The cooling water being heated is circulated through the vehicle interior heater 5 to heat the vehicle interior.

  By the way, for example, when the output signal of the heating element 60 from the driver 62 is not the same as the control signal from the ECU 63 to the driver 62, for example, the duty ratio is not the same, and an abnormal current flows through the heating element 60. The case 30 passes over the locking claw 80 and then contacts the housing 10 as shown in FIG. When the case 30 comes into contact with the housing 10, the wax W in the case 30 continues to expand even though the space S is not expanded, so that the wax W leaks from the seal portion between the piston 20 and the case 30. When the wax W leaks from the case 30, if there is no locking claw 80, the valve body 40 is closed by the urging force of the coil spring 90, the through hole 13a is closed, and the flow of the cooling water is stopped, and the engine 1 is overheated. There is a fear.

  However, the locking groove 70 of the case 30 integrated with the valve body 40 that moves in the closing direction of the through hole 13a by the bias of the coil spring 90 is locked to the locking claw 80 as shown in FIG. 40 is kept open. Thereby, even when the wax W leaks from the case 30, the circulation of the cooling water is ensured, and for example, overheating of the engine 1 can be prevented.

  In order to secure the locking state (holding state) of the locking groove 70 and the locking claw 80, a plurality of the locking claw 80 and the locking groove 70 are provided in the circumferential direction of the case 30 as shown in FIG. It is good to provide at equal intervals. The locking groove 70 may be directly provided in the case 30 by press molding or roll molding, or a cap 31 (indicated by a broken line in FIG. 2) which is a separate member from the case 30 in which the locking groove 70 is formed. May be fixed to the case 30 by welding or pressing. Thereby, it is not necessary to provide a new case (valve element) having a locking groove for a case (valve element) having no locking groove.

  FIG. 7 shows a control flow of the fluid control valve 100, particularly a flow of lighting the check engine lamp 65 when the control signals before and after the driver 62 are not the same as the output signals. When heating of the vehicle interior by the vehicle interior heater 5 is requested (START), it is determined whether the driver input duty (control signal) and the driver output duty (output signal) are the same. Otherwise, the check engine lamp is turned on and the routine proceeds to RETURN. Thereby, for example, when an abnormality occurs in which excessive current flows in the heating element 60, the occupant can recognize the lighting of the check engine lamp, and can heat the vehicle interior by the vehicle interior heater 5 or stop the engine 1, and the case 30 It is possible to prevent the inside wax W from leaking from the seal portion between the piston 20 and the case 30 and to take measures against abnormality.

  Next, a second embodiment of the present invention will be described with reference to FIGS.

  FIG. 8 is a schematic view showing a closed state of the fluid control valve 200 according to the second embodiment of the present invention. FIG. 9 is a schematic view showing a valve open state of the fluid control valve 200 of the second embodiment. FIG. 10 is a schematic view showing a state in which the valve body 220 is locked in the open state when the valve portion is actuated (rotated) in a direction to open the flow path by a predetermined amount.

  The second embodiment has a structure in which the valve body 220 rotates and intermittently opens and closes (opens and closes) with respect to the structure in which the valve body 40 of the first embodiment moves in the axial direction and opens and closes the flow path.

  The fluid control valve 200 is formed with an inlet 211 and an outlet 212 and is covered with a cover (not shown) provided with a through hole in the center, and forms a cylindrical space 213. The fluid control valve 200 is rotatable in the cylindrical space 213. And a cylindrical valve body 220 having a rotating shaft 222 inserted through the through-hole of the cover at the center.

  The rotating shaft 222 is formed with a locking projection (holding means) 222a extending in the radial direction, and the case 210 is formed with a distal end bent in a substantially J-shape, L-shape or acute angle, and can be deformed. A locking claw (holding means) 210a that is locked by the locking projection 222a is provided. The valve body 220 is provided with a magnet (not shown) and is rotated by an electromagnet (not shown) provided in the case 210, and the inlet 211 and the outlet 212 are intermittently connected via the flow path 221 to be closed or opened. .

  When the electromagnet is OFF, the valve body 220 is urged clockwise by the urging means 230 having one end locked to the case 210 and the other end locked to the locking projection 222a, and the inlet 211 and outlet 212 Is disconnected (closed). When the electromagnet is ON, the valve body 220 is rotated counterclockwise against the pulling of the biasing means 230, and the inlet 211 and the outlet 212 are communicated (opened) via the flow path 221. . In order to rotate the valve body 220 counterclockwise, bimetal or thermowax may be used instead of the magnetic force.

  A driver (not shown) that controls the electromagnet caused an abnormal output signal, for example, an overcurrent with a duty ratio different from the input duty ratio, to an input signal (for example, duty ratio) from an ECU (not shown). When the output signal for interrupting the rear current is output to the electromagnet, and the valve element 220 is operated in the direction of opening the predetermined amount of flow path shown in FIG. 10 from the open state shown in FIG. 9, the locking protrusion 222a is locked. The valve body 220 is held in the open state by being locked by the claw 210a. Thereby, even when the driver is not normal, the circulation of the cooling water is ensured, and for example, overheating of the engine 1 can be prevented.

31 ... Cap 40, 220 ... Valve (valve part)
50 ... temperature sensing part 60 ... heating element 70 ... locking groove (holding means)
80, 210a ... locking claw (holding means)
222a ... Locking protrusion (holding means)
100, 200 ... Fluid control valve

Claims (5)

A fluid control valve having a valve portion that is disposed in a flow path through which a fluid flows and opens and closes the flow path by operation,
A fluid control valve comprising holding means for holding the valve portion in an open state when the valve portion is actuated in a direction to open the flow path by a predetermined amount. In claim 1,
A fluid control valve comprising a temperature sensing part that operates based on the temperature of the fluid and moves the valve part, and holds the valve part in an open state when the valve part moves in a direction to open the flow path by a predetermined amount. In claim 2,
A fluid control valve in which a heating element is provided in the temperature sensing part. In any one of Claims 1 thru | or 3,
The holding means is a fluid control valve that is provided on a cap that is a separate member from the valve portion and is fixed to the valve portion. In claim 1,
The said valve part is rotatable, The fluid control valve which opens and closes the said flow path.

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