JP2010060067A - Gas cord connection structure and plug - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas cord connection structure determining that a connection state of a plug and a joint member is a normal connection state in a non-contact state which does not require mechanical operation and electrical contact with the outside. <P>SOLUTION: In the gas cord connection structure with respect to the plug 40, a sleeve member 34 is constituted by a magnetic material for changing the magnetic flux of a coil 51 provided on the plug 40 side in the normal connection state where the plug 40 and the joint member 20 are interconnected to permit gas to flow between a gas cord 10 and an inner fluid flow passage 46. The gas cord connection structure is provided with a connection state determination means A for determining the normal connection state based on change in the inductance of the coil 51. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention comprises a plug main body and a connecting portion, and a joint member in which a gas cord is connected to a plug provided with an internal fluid flow path extending from an axial tip to a base end. A gas cord connection structure for connecting to a gas pipe, or a connection portion to which a joint member to which a gas cord is connected is connected and a plug body, and an internal fluid flow path extending from the distal end to the proximal end in the axial direction. Related to the plug.

  Generally, the gas cord connection structure as described above is configured to connect a joint member provided at the tip of the gas cord to a plug provided in a gas appliance body such as a gas rice cooker or a gas fan heater. It functions to supply gas to the gas equipment body.

As described above, since the gas device is used with the joint member connected to the plug, the plug and the joint member are connected so that gas can flow between the gas cord and the internal fluid flow path of the plug. It is required to determine whether the connection state is normal or the connection member is not connected to the plug.
Therefore, as a conventional gas cord connection structure, there is one in which connection state detection means is provided for the plug as means for detecting whether the connection between the plug and the joint member is a normal connection state or a non-connection state. The connection state detecting means is provided with a mechanical switch that is pressed by a part of the joint member to be turned on from the OFF state when the joint member is connected to the plug to be in a normal connection state, and the mechanical switch is turned on. If it is configured to determine whether it is in a normal connection state or a non-connection state depending on whether it is in a state or an OFF state, or when a joint member is connected to a plug and enters a normal connection state, a part of the joint member from the non-conduction state A pair of terminal portions that are in a conductive state that is electrically connected through the conductive portion, and whether the pair of terminal portions is in a non-conductive state or a conductive state is determined to be in a normal connection state or a non-connection state. Some are configured (see, for example, Patent Document 1).

JP 2006-83989 A

  In the gas cord connection structure disclosed in Patent Document 1, there is a possibility that the determination of the normal connection state or the non-connection state may be erroneously determined, and there is a possibility that the normal connection state cannot be accurately determined. In other words, in the case of determining whether the mechanical switch is in the normal connection state or the non-connection state depending on whether it is in the ON state or the OFF state, for example, when the rubber hose is accidentally connected to the plug, the rubber hose hits the mechanical switch. Therefore, there is a risk of erroneous determination that the connection is normal. Moreover, there is a possibility that an erroneous determination may occur due to a failure of the mechanical switch itself. For determining whether a pair of terminal parts are in a normal connection state or a non-connection state depending on whether they are in a non-conductive state or a conductive state, even if a coupling member is connected to the plug, foreign matter such as dirt or dust on the terminal portion is caught. For example, the pair of terminal portions may be in a non-conductive state, and may be erroneously determined as being in a non-connected state.

  The present invention has been made in view of the above problems, and its purpose is to prevent misjudgment of determination of being in a normal connection state and to accurately determine that it is in a normal connection state. The structure and plug are provided.

In order to achieve the above object, a gas cord connection structure according to the present invention comprises a plug main body and a connection portion, and a plug having an internal fluid flow path extending from the distal end to the proximal end in the axial direction. In the gas cord connection structure for connecting the joint member to which the gas cord is connected to the connection portion,
In the characteristic configuration, the joint member includes a sleeve member that is externally fitted to the connection portion.
The sleeve member is generated in a coil provided on the plug side in a normal connection state in which the plug and the joint member are connected so that gas can flow between the gas cord and the internal fluid flow path. Consists of a magnetic material that changes the magnetic flux,
A connection state determination means for determining the normal connection state based on a change in inductance of the coil is provided.

  According to the above characteristic configuration, the sleeve member made of a magnetic material in a normal connection state in which the plug and the joint member are connected so that gas can flow between the gas cord and the internal fluid flow path of the plug. However, since the magnetic flux generated in the coil is changed, the inductance of the coil changes with the change of the magnetic flux. Thereby, the connection state determination means can determine the normal connection state by capturing the change in the inductance of the coil. In this determination, it is only necessary to capture a change in the inductance of the coil, and no mechanical operation is involved. Therefore, a conventional erroneous determination due to a mechanical switch failure or the like can be prevented. Also, for example, when a rubber hose is connected to the plug, the magnetic flux generated in the coil by the rubber hose is not changed, and when a joint member is connected to the plug, it is not affected by foreign matter such as dirt or dust. Further, the sleeve member can change the magnetic flux generated in the coil. Therefore, it is possible to realize a gas cord connection structure that can prevent erroneous determination of the normal connection state and accurately determine the normal connection state.

  A further characteristic configuration of the gas cord connection structure according to the present invention is that the sleeve member and the coil are arranged at a position where they overlap in the axial direction of the plug in the normal connection state.

  According to the above characteristic configuration, in the normal connection state between the plug and the joint member, the coil is arranged at a position overlapping the sleeve member in the axial direction of the plug, that is, at a position close to the sleeve member. Will accurately receive a change from the sleeve member, and the connection state determination means can accurately determine that the connection state is normal.

  The gas cord connection structure according to the present invention is further characterized in that the coil is wound around the connection portion and disposed inward in the radial direction of the plug than the sleeve member in the normal connection state. In the point.

  According to the above characteristic configuration, it is possible to appropriately determine the normal connection state between the plug and the joint member only by winding the coil around the connection portion of the plug. In addition, if the coil is wound around the connection portion of the plug, the coil can be satisfactorily fixed to the plug without providing another fixing member, so that the gas cord connection structure can be made compact. Can do.

The gas cord connection structure according to the present invention is further characterized in that the joint member includes the sleeve member movably in the axial direction at an outer peripheral portion of the cylindrical main body, and a radial position on the inner diameter surface of the sleeve member. A locking ball that is regulated, a first regulating surface that regulates the locking ball to an outer diameter side position at a non-gas code side portion in the axial direction of the sleeve member, and the first axial direction of the sleeve member. A second restricting surface provided on the gas cord side from the restricting surface and restricting the locking ball to an inner diameter side position;
The connecting portion includes a first annular portion, a lock groove portion for receiving the locking ball, a second annular portion, and a third annular portion having an outer diameter larger than the outer diameter of the second annular portion from the distal end to the proximal end. Configured with
The coil is wound around the third annular portion.

According to the above characteristic configuration, the sleeve member protrudes toward the non-gas cord side in the axial direction of the plug, and the lock ball is fitted into the lock groove portion. Thus, in the normal connection state, for example, the sleeve member Becomes a position overlapping with the third annular portion in the axial direction of the plug, and the magnetic flux of the coil wound around the third annular portion changes. Therefore, in the normal connection state, the fitting of the locking ball and the lock groove portion restricts the position of the joint member with respect to the plug so that the gas cord and the internal fluid flow path of the plug are properly distributed. Can be appropriately determined as a normal connection state.
In addition, since the coil is wound around the third annular portion that is the base end side of the connecting portion of the plug, for example, the coil overlaps with the sleeve member in the axial direction of the plug, that is, the joint member is in contact with the plug. An appropriately connected state can be determined as a normal connection state. A state in which the joint member is not sufficiently connected to the plug, for example, a state in which the sleeve member is located in the first annular portion of the plug or the second annular portion of the plug is a normal connection state. Incorrect determination can be suppressed.

  The gas cord connection structure according to the present invention is further characterized in that the coil is supported by a coil support member and disposed outside the sleeve member in the radial direction of the plug in the normal connection state. It is in.

  Since the coil can be fixed by being supported by the coil support member with respect to the plug, it can be easily attached to the current plug. Further, the coil can be positioned outside the sleeve member in the radial direction of the plug by the coil support member, and the magnetic flux around the coil can be appropriately changed.

  The gas cord connection structure according to the present invention is further characterized in that the connection state determination means includes a capacitor provided so as to form a parallel resonance circuit with the coil, and an AC power source that applies an AC voltage to the parallel resonance circuit. And a measurement unit that measures an output related value of the parallel resonant circuit as a change in the inductance, and a connection between the plug and the joint member is the normal connection based on the output related value measured by the measurement unit And a determination unit for determining that the state is present.

  According to the above characteristic configuration, the AC power source applies an AC voltage from the AC power source to the parallel resonance circuit formed by the coil and the capacitor described above, and the measurement unit has a sleeve member made of a magnetic material in the vicinity of the coil. A change in the inductance of the coil accompanying the positioning can be measured as an output related value of the parallel resonant circuit. And the determination part can determine that the connection of the said plug and the said coupling member is a normal connection state based on the said output relevant value.

  The gas cord connection structure according to the present invention is further characterized in that, in the state where the AC voltage is set to a determination frequency, the determination unit has a voltage as the output related value equal to or higher than a connection state determination threshold value. In addition, the connection between the plug and the joint member is determined to be in the normal connection state.

  According to the above characteristic configuration, the AC voltage is set as the determination frequency, and the voltage that is the output-related value of the parallel resonance circuit when the joint member is connected to the plug, for example, by an experiment, and the joint member on the plug. The voltage that is the output related value of the parallel resonant circuit when the is not connected, and the connection state determination threshold is determined between the two acquired voltages, the voltage that is the output related value is connected When it is equal to or greater than the determination threshold, it can be determined that the connection is normal. Moreover, when the voltage which is an output related value is less than a connection state determination threshold value, it can be determined that the plug and the joint member are not connected. That is, the connection state determination means can measure the voltage that is the output related value of the parallel resonance circuit, and can determine the normal connection state only by determining that it is equal to or higher than the connection state determination threshold value. Connection status can be determined.

The plug used in the gas cord connection structure according to the present invention includes a connection portion to which a joint member to which a gas cord is connected is connected and a plug main body, and an internal fluid flow from the distal end to the proximal end in the axial direction. A plug with a road,
In the normal connection state in which the plug and the joint member are connected so that gas can flow between the gas cord and the internal fluid flow path, the characteristic configuration of the joint member that is externally fitted to the connection portion The coil includes a coil that receives a change in magnetic flux by a sleeve member made of a magnetic material, and a connection state determination unit that determines the normal connection state based on a change in inductance of the coil.

  According to the above characteristic configuration, the plug used in the gas cord connection structure can be a plug with a coil that exhibits the same effects as those described above in the gas cord connection structure.

Embodiments of the present invention will be described with reference to the drawings.
Hereinafter, first, connection of the gas cord 10 to the plug 40 via the joint member 20 which is a premise in the present application will be described with reference to FIGS. 4 (a) and 4 (b). FIG. 4A shows a disconnected state in which the joint member 20 is not connected to the plug 40. On the other hand, FIG. 4B shows that the joint member 20 is connected to the plug 40, and a fluid flow path 22 is formed across the gas cord 10, the joint member 20, and the plug 40. It is a normal connection state in which gas etc. can distribute.

  Hereinafter, the configuration of the joint member 20, the configuration of the plug 40, the connection operation from the non-connection state to the normal connection state, and the separation operation from the normal connection state to the non-connection state will be described in the order described.

  As shown in FIG. 4A, the joint member 20 includes a connector 11 to which the gas cord 10 is connected, a cylindrical main body 21 connected to the connector 11, an axial direction inside the cylindrical main body 21 (in FIG. 4). An operation member 33 movable in the vertical direction), a cylindrical sleeve member 34 movable in the axial direction at the outer peripheral portion of the cylindrical main body 21, and a non-gas cord side of the cylindrical main body 21 in the axial direction. In addition, a lock ball 35 whose axial position is regulated by the inner diameter surface of the sleeve member 34 is provided. A first coil spring 31 is provided between the connector 11 and the actuating member 33 in the axial direction to urge the actuating member 33 toward the distal end side, which is the non-gas cord side (lower side in FIG. 4). Between the axial direction of the cover member 23 and the sleeve member 34, a second coil spring 32 that urges the sleeve member 34 toward the distal end side which is the non-gas cord side with respect to the cover member 23 is provided.

Furthermore, the cover member 23 provided on the joint member 20 is mainly used for an operator to hold the joint member 20 when the joint member 20 is connected to the plug 40.
Further, the joint member 20 is provided with a tip member 24 for positioning the axial position of the locking ball 35 from the tip side with the cylindrical main body 21.

  The sleeve member 34 provided in the joint member 20 is movable in the axial direction with respect to the cylindrical main body 21 and the tip member 24. As shown in FIG. 4 (b), in the above-described normal connection state, the sleeve member 34 is more sensitive to the tip member 24 than the non-connection state shown in FIG. 4 (a). It is located at a position protruding to the tip side.

  The sleeve member 34 is used when the connection state determination means A described later determines whether the connection state of the joint member 20 to the plug 40 is a non-connection state or a normal connection state.

A non-connector portion in the axial direction of the sleeve member 34 is provided with a first restricting surface 25 for restricting the locking ball 35 to the outer diameter side portion, and the locking ball is located on the gas cord side from the first restricting surface 25. A second regulating surface 26 that regulates 35 to the inner diameter side portion is provided.
In the non-connected state shown in FIG. 4A, due to the positional relationship between the locking ball 35 and the sleeve member 34, the locking ball 35 is restricted from moving in the radial direction by the first restriction surface 25, and the actuating member 33 is In the closed posture moved to the non-gas cord side, the outflow of fluid from the tip of the joint member 20 on the non-gas cord side is stopped.
On the other hand, in the normal connection state shown in FIG. 4B, due to the positional relationship between the locking ball 35 and the sleeve member 34, the radial movement of the locking ball 35 is restricted by the second restriction surface 26, and the actuating member 33 is The fluid is allowed to flow out from the tip of the joint member 20 in the open posture moved to the gas cord side. Accordingly, the joint member 20 is configured to be able to switch between outflow and stop of the fluid from the tip between the non-connected state and the normal connected state.

Next, the configuration of the plug 40 will be described. As shown in FIG. 4A, the plug 40 includes a plug body 45 and a connection portion S to which the joint member 20 is connected, and the fluid flow described above from the distal end to the proximal end in the axial direction. An internal fluid flow path 46 constituting a part of the path 22 is provided. The connecting portion S has a first annular portion 41, a lock groove portion 42 and a second annular portion 43 that receive the locking ball 35, and a second annular portion 43 toward the proximal end side from the distal end side toward the proximal end side. A third annular portion 44 having a diameter larger than that of the two annular portions 43 is sequentially provided. Further, the base end side is configured to include a plug body 45 including a large diameter portion larger in diameter than the third annular portion 44 and a small diameter portion smaller in diameter than the large diameter portion.
In the example shown in the figure, the first annular portion 41 and the second annular portion 43 are configured to have the same diameter, and the lock groove portion 42 is configured as a substantially triangular groove in a sectional view.

  Next, regarding the connection of the joint member 20 to the plug 40, a connection operation for connecting from a non-connection state to a normal connection state will be described. The operator holds the cover member 23 of the joint member 20 and moves the joint member 20 so that the plug 40 is fitted on the outside. In the moving operation, the tip of the plug 40 comes into contact with the tip of the operating member 33 and pushes the operating member 33 into the gas cord side of the joint member 20. In this situation, the joint member 20 changes from the closed state shown in FIG. 4A to the open state shown in FIG. Along with this, the locking ball 35 is fitted into the locking groove portion 42, and the position holding of the sleeve member 34 biased toward the distal end side to the proximal end side by the locking ball 35 is released, and the sleeve member 34 is moved to the distal end. Protrudes to the side. The above is the connection operation for connecting from the non-connected state in FIG. 4A to the normal connected state in FIG.

  Next, a connection release operation for releasing the connection from the normal connection state to the non-connection state will be described. The operator holds the sleeve member 34 of the joint member 20 and moves the sleeve member 34 to the proximal end side of the joint member 20. In the state before the movement, the joint member 20 is in an open state shown in FIG. In the moving operation, the operator moves the sleeve member 34 to the gas cord side against the urging force of the second coil spring 32, so that the first regulating surface 25 of the sleeve member 34 becomes the locking ball 35 in the axial direction. The locking ball 35 is detached from the locking groove 42 at the opposite position. As a result, the sleeve member 34 is held on the gas cord side by the locking ball 35 and the normal connection state between the joint member 20 and the plug 40 is released. This is the connection state release operation.

The above is the basic configuration of the gas cord connection structure of the present application. Hereinafter, the gas code connection structure that is the characteristic configuration of the present application will be described with reference to FIGS. 1 (a) and 1 (b).
The coil 51 is provided so as to be wound around the connection portion S of the plug 40. The sleeve member 34 of the joint member 20 is made of a magnetic material such as stainless steel, and is located in the vicinity of the coil 51 in the normal connection state shown in FIG. 1B so as to change the magnetic flux generated in the coil 51. It is configured. The connection state determination means A is configured to determine that the connection state is normal based on the change in the inductance of the coil 51.
The connection state determination means A includes a capacitor 52 provided to form a parallel resonance circuit with the coil 51, an AC power supply 53 that applies an AC voltage to the parallel resonance circuit, and a change in inductance of the coil 51 as a change in inductance of the parallel resonance circuit. A voltmeter 54 (an example of a measurement unit) that measures a voltage as an output-related value, and a determination unit that determines that the connection between the plug 40 and the joint member 20 is in a normal connection state based on the measurement result of the voltmeter 54 55.
The AC power supply 53 and the voltmeter 54 are provided in parallel to the capacitor of the parallel resonance circuit, as shown in FIGS. 1 (a) and 1 (b).
The determination unit 55 is arranged so as to acquire information on the voltage as the output related value from the voltmeter 54 and can be configured by, for example, a microchip.

Here, the determination of the normal connection state by the connection state determination means A will be briefly described. As shown in FIG. 1B, the coil 51 is disposed in the radial direction of the plug 40 in the vicinity of the inside of the sleeve member 34 when the joint member 20 and the plug 40 are in a normal connection state, and the plug 40 Is disposed at a position overlapping the sleeve member 34 in the axial direction. That is, the coil 51 is located in the vicinity of the sleeve member 34. At this time, the magnetic flux generated around the coil 51 changes in response to the change in magnetic permeability of the sleeve member 34, which is a magnetic material. The voltmeter 54 measures a voltage as an output related value of the parallel resonance circuit as a change in the inductance of the coil 51 accompanying the change in the magnetic flux.
The determination unit 55 is based on the fact that the output related value in the non-connected state shown in FIG. 1A is different from the output related value in the normal connected state shown in FIG. Thus, it is determined whether the connection state between the plug 40 and the joint member 20 is a normal connection state or a non-connection state.

  The coil 51 is provided by being wound along the circumferential direction of the third annular portion 44 in the connection portion S of the plug 40. Thereby, the determination part 55 can determine that the joint member 20 is in a state of securely fitting the connection part S of the plug 40 as a normal connection state, and the joint member 20 is insufficient with the plug 40. For example, when the sleeve member 34 is in a connected state, the tip of the sleeve member 34 is present at a position where it overlaps the first annular portion 41 or the second annular portion 43 of the connecting portion S of the plug 40 in the axial direction of the plug 40. It can be suppressed that the state is erroneously determined as the normal connection state. Therefore, by providing the coil 51 in the third annular portion 44 that is the proximal end side of the connection portion S of the plug 40, the normal connection state can be satisfactorily determined.

For example, the coil 51 is wound in a single direction in the radial direction of the plug 40 using an enameled wire having a diameter of about 0.05 mm to 0.25 mm, the outer diameter is 15 mm, and the length in the axial direction is 4. It can be configured in a 5 mm shape.
For example, when the winding number is set to about 100 with a thin enameled wire with a diameter of 0.05 mm, the inductance of the coil 51 in the normal connection state is about 365 μH, and the inductance of the coil 51 in the non-connection state is It becomes about 551 μH.
In addition, for example, when a thick enameled wire with a diameter of 0.25 mm and the number of turns is set to about 10, the inductance of the coil 51 in a normal connection state is about 2.53 μH, and the coil 51 in a non-connection state The inductance is about 3.86 μH.

  Although FIG. 1 shows a configuration in which the coil 51 is disposed on the radially inner side of the plug 40 with respect to the sleeve member 34 in the normal connection state, the coil 51 is in the sleeve in the normal connection state based on FIG. A configuration provided outside the member 34 in the radial direction of the plug 40 will be described. The embodiment shown in FIG. 2 differs from the embodiment shown in FIG. 1 in the position of the coil 51 relative to the sleeve member 34. Hereinafter, the difference will be mainly described. In addition, regarding description, about the structure similar to embodiment of FIG. (1) mentioned above, the same code | symbol shall be attached | subjected and description may be omitted.

  The coil 51 is supported by a coil support member 56 fixed to the plug body 45, and is disposed at a position outside the sleeve member 34 in the radial direction of the plug 40, and is connected to the sleeve member 34 in the axial direction of the plug 40. It is arranged at the overlapping position.

The coil support member 56 is externally fixed to the plug main body 45 and is configured to cover the outer periphery of the connection portion S. The coil 51 is wound around the coil support member 56 so that the sleeve member 34 can be inserted into and removed from the internal space in the non-connected state shown in FIG. 2A and the normal connected state shown in FIG. It is supported in the state that was done. Since the coil 51 is supported by the coil support member 56 as described above, the coil 51 can be attached to the plug 40 that has been conventionally provided by a retrofit.
Also in this embodiment, the coil 51 is disposed in the vicinity of the outer side of the sleeve member 34 in the radial direction of the plug 40 in the connected state of the plug 40 and the joint member 20, and is connected to the sleeve member 34 in the axial direction of the plug 40. It is arranged at the overlapping position. As a result, the magnetic flux generated around the coil 51 changes in response to the change in the magnetic permeability by the sleeve member 34 that is a magnetic body.

  In the unconnected state shown in FIG. 2A, the coil 51 is in a position that does not overlap the sleeve member 34 in the axial direction of the plug 40, that is, a position away from the sleeve member 34, and around the coil 51. The generated magnetic flux hardly changes. On the other hand, in the normal connection state shown in FIG. 2B, the coil 51 is in a position overlapping the sleeve member 34 in the axial direction of the plug 40, that is, a position in the vicinity of the sleeve member 34. The magnetic flux generated around the area changes. As a result, even when the embodiment of FIG. 2 is adopted, the connection state determination means A of the present application can satisfactorily determine that the connection state is normal based on the change in the inductance of the coil 51.

Next, a configuration will be described in which the determination unit 55 illustrated in FIGS. 1 and 2 determines whether the connection state between the plug 40 and the joint member 20 is a normal connection state or a non-connection state.
For the parallel resonant circuit formed by the coil 51 and the capacitor 52 described above, the AC power supply 53 sets the frequency to the determination frequency and applies an AC voltage from the AC power supply, and the measurement unit 54 changes the inductance of the coil 51. Is measured as the voltage value of the parallel resonant circuit. Based on the voltage measured by the measurement unit 54 with the alternating voltage set to the determination frequency, the determination unit 55 determines whether the voltage is equal to or higher than the connection state determination threshold. It is determined whether the connection with the member 20 is a normal connection state, or whether the plug 40 and the joint member 20 are not connected. That is, when the voltage measured by the voltmeter 54 that is the measurement unit is equal to or higher than the connection state determination threshold, the determination unit 55 determines that the connection state is normal, and conversely, the voltage measured by the measurement unit 54 is If it is less than the connection state determination threshold, it is determined that the connection state is not established.

FIG. 3 is a graph showing a result of an experiment on how the detected voltage detected by the voltmeter 54 serving as a measurement unit changes when the frequency of the AC voltage applied to the parallel resonant circuit is changed. . According to this experimental result, the magnitude of the difference between the detection voltage in the normal connection state and the detection voltage in the non-connection state varies depending on the frequency. For example, when the frequency is 270 kHz, the detection voltage in the normal connection state and the non-connection state The difference from the detected voltage is large.
Therefore, for example, the connection state determination threshold when the frequency of the AC voltage as the determination frequency is 270 kHz is set to 3.144 V, which is between the detection voltage in the normal connection state and the detection voltage in the non-connection state. Thus, in a state where the determination frequency is set so that the difference between the detection voltage in the normal connection state and the detection voltage in the non-connection state is large, the voltage measured by the voltmeter 54 as the measurement unit is equal to or greater than the connection state determination threshold value. Whether it is a normal connection state or a non-connection state can be determined depending on whether or not, and the determination can be performed accurately and accurately.

  Although the gas connection structure in the present invention has been described, the present invention may be a coiled plug including the coil 51 and the connection state determination means A as described above.

[Another embodiment]
(1)
In the above embodiment, the coil 51 is shown as being wound in a single direction in the radial direction of the plug 40. However, the coil 51 does not have to be separately wound, and can be wound in a multiple manner. .

(2)
In the above-described embodiment, the connection state determination unit A determines the normal connection state using the voltage as the output related value of the parallel resonance circuit, but can also determine using the current flowing in the parallel resonance circuit. For example, a measuring unit such as an ammeter is provided in the parallel resonant circuit. In the disconnected state, the frequency of the AC voltage applied to the parallel resonance circuit is set to a predetermined resonance frequency so that no current flows through the parallel resonance circuit. In such a setting, the current flowing through the circuit does not flow in the non-connected state, and the impedance of the coil 51 shifts in the normal connected state, so that the resonance frequency deviates from the predetermined resonance frequency. Current will flow through the circuit. That is, with this configuration, the determination unit 55 can determine that the current is not flowing based on the current value of the ammeter that is the measurement unit when the current does not flow. If it is, it can be determined that the connection is normal. Of course, the current may be set in a normal connection state when no current flows and in a non-connection state when current flows.

  The gas cord connection structure and plug of the invention of the present application are effective as a gas cord connection structure and a coiled plug that can prevent the erroneous determination of the normal connection state and can accurately determine the normal connection state. Is available.

Sectional drawing of the gas cord connection structure concerning this embodiment Sectional drawing of the gas-cord connection structure concerning another embodiment The figure which shows the example of judgment of the normal connection state based on the output voltage of a parallel resonance circuit Conventional example of gas cord connection structure

Explanation of symbols

10: Gas cord 34: Sleeve member 25: First regulating surface 26: Second regulating surface 35: Locking ball 40: Plug 41: First annular portion 42: Lock groove portion 43: Second annular portion 44: Third annular portion 45: Plug body 51: Coil 52: Capacitor 53: AC power supply 54: Voltmeter 55: Determination unit 56: Coil support member A: Connection state determination means

Claims (8)

A gas configured to include a plug main body and a connecting portion, and to connect a joint member, to which the gas cord is connected, to the connecting portion with respect to a plug having an internal fluid flow path extending from the distal end to the proximal end in the axial direction. In the cord connection structure,
The joint member includes a sleeve member that is externally fitted to the connection portion,
The sleeve member is generated in a coil provided on the plug side in a normal connection state in which the plug and the joint member are connected so that gas can flow between the gas cord and the internal fluid flow path. Consists of a magnetic material that changes the magnetic flux,
A gas cord connection structure comprising connection state determination means for determining the normal connection state based on a change in inductance of the coil.   2. The gas cord connection structure according to claim 1, wherein the sleeve member and the coil are arranged at a position where they overlap in the axial direction of the plug in the normal connection state.   3. The gas cord connection structure according to claim 1, wherein the coil is wound around the connection portion and is disposed on an inner side in a radial direction of the plug than the sleeve member in the normal connection state. The joint member includes the sleeve member movably in an axial direction at an outer peripheral portion of the cylindrical main body, a locking ball whose radial position is regulated by an inner diameter surface of the sleeve member, and an axial direction of the sleeve member A first restricting surface for restricting the locking ball to an outer diameter side position at a non-gas cord side portion of the sleeve, and the locking ball provided on the gas cord side from the first restricting surface in the axial direction of the sleeve member. A second restriction surface that restricts the inner diameter side position,
The connecting portion includes a first annular portion, a lock groove portion for receiving the locking ball, a second annular portion, and a third annular portion having an outer diameter larger than the outer diameter of the second annular portion from the distal end to the proximal end. Configured with
The gas cord connection structure according to claim 3, wherein the coil is wound around the third annular portion.   3. The gas cord connection structure according to claim 1, wherein the coil is supported by a coil support member, and is disposed on an outer side in a radial direction of the plug than the sleeve member in the normal connection state.   The connection state determination means includes a capacitor provided to form a parallel resonance circuit with the coil, an AC power source that applies an AC voltage to the parallel resonance circuit, and an output related value of the parallel resonance circuit as a change in the inductance. And a determination unit that determines that the connection between the plug and the joint member is in the normal connection state based on the output-related value measured by the measurement unit. The gas cord connection structure according to any one of claims 1 to 5.   In the state where the AC voltage is set to a determination frequency and the voltage as the output related value is equal to or higher than a connection state determination threshold, the determination unit determines that the connection between the plug and the joint member is the normal connection. The gas cord connection structure according to claim 6, wherein the gas cord connection structure is determined to be in a state. In a plug comprising an internal fluid flow path extending from the distal end to the proximal end in the axial direction, comprising a connecting portion to which a joint member to which a gas cord is connected is connected and a plug body.
In a normal connection state in which the plug and the joint member are connected so that gas can flow between the gas cord and the internal fluid flow path, the sleeve is formed of a magnetic body of a joint member that is externally fitted to the connection portion. A coil-equipped plug comprising: a coil that receives a change in magnetic flux by a member; and a connection state determination unit that determines the normal connection state based on a change in inductance of the coil.

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