Gas valve fixing structure

Abstract

To provide a fixing structure of a gas cock capable of firmly connecting and fixing a gas cock and a flange member and improving workability by simplifying the connection fixing of them.SOLUTION: A fixing structure of a gas cock includes a gas cock 2 having a connection cylinder portion 14, and a flange member 4 having an insertion connection portion 24, and the connection cylinder portion 14 of the gas cock 2 is inserted and connected to the insertion connection portion of the flange member 4. A pressing holding member (ring-like member such as stop ring) is mounted on the insertion connection portion 24 of the flange member 4. When the connection cylinder portion 14 at a gas cock 2 side, is inserted to the insertion connection portion 24 at a flange member 4 side, the pressing holding member presses the connection cylinder portion 14 to a radial inner peripheral side, and acts on most of the connection cylinder portion 14 in at least a circumferential direction to retain the connection. Thus, the gas clock 2 and the flange member 4 can be surely connected and fixed.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a gas tap fixing structure that fixes a gas tap and a flange member attached to the gas tap. [Background technology]

[0002] In order to make a gas valve used with iron pipe piping applicable to flexible piping as well, a flange member is connected to the inlet connection part of the gas valve (specifically, the connecting tube part at the tip side of the gas valve) and this flange member is fixed to a fixed wall such as a kitchen wall; by attaching the flange member in this manner, the gas valve connected to the flexible piping is fixed to the fixed wall (see, for example, Patent Document 1).

[0003] The fixing structure between the gas plug and the flange member is configured, for example, as follows: The outer peripheral surface of the inflow connection part of the gas plug is formed in a hexagonal shape, the insertion connection part of the flange member is provided with a hexagonal insertion opening corresponding to the hexagonal shape of the inflow connection part of the gas plug, and an insertion hole part is provided in the insertion connection part (specifically, inside the insertion opening part) corresponding to the connection tube part on the tip side of the inflow connection part. In this gas plug, the connection tube part of the gas plug is inserted into the insertion hole part through the insertion opening part of the flange member, and while inserted into this insertion hole part, fixing screws are screwed through the insertion connection part of the flange member in the radial direction (for example, screwed into three places spaced apart in the circumferential direction), and in this manner the connection tube part of the gas plug is attached to the insertion connection part of the flange member.

[0004] When this gas valve is attached to a fixed wall or the like, a mounting bracket is used to fix the gas valve in combination with a flange member, and this mounting bracket is configured to be capable of changing its shape between a basic shape that is larger than a drawer opening formed in the fixed wall or the like, and a deformed shape that is smaller than the drawer opening. This mounting bracket is attached to the flange member by a pair of mounting screws, and in this attached state, it is changed into a deformed shape and inserted into the inside of the drawer opening of the fixed wall, for example, through the drawer opening of the fixed wall. This mounting bracket is configured to return to its basic shape by releasing the deformed shape after insertion, and when the pair of mounting screws are tightened in this basic shape, the mounting bracket moves in a direction approaching the flange member and cooperates with the flange member to clamp the fixed wall to be attached, and in this way the gas valve is attached and fixed to the fixed wall. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2006-266366 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, such a fixing structure between the gas valve and the flange member has the following problems. That is, since the gas valve and the flange member are fixed with fixing screws, for example, the fixing screws must be tightened in three places, which requires a process for this tightening and fixing, and the fixing work is also complicated. Also, in order to tighten and fix multiple places with fixing screws, all screwed points must be tightened with an appropriate strength, which makes it difficult to work on tightening and fixing them as required.

[0007] An object of the present invention is to provide a connecting structure that can firmly fix a gas valve and a flange member and can simplify the fixing thereof to improve workability. [Means for solving the problem]

[0008] The fixing structure of a gas plug according to a first aspect of the present invention comprises a gas plug having a connecting tube portion and a flange member having an insertion connecting portion, Insert the hole into A fixing structure for a gas cock into which the connecting tube portion of the gas cock is inserted and connected, An accommodation groove is provided on the inner peripheral surface of the insertion hole of the insertion connection part, an annular spacer is accommodated in the accommodation groove, and a pressing and retaining member is accommodated on the inner peripheral side of the annular spacer, the annular spacer acts on the pressing and retaining member to hold it concentrically, and the pressing and retaining member is The connecting tube portion of the gas cock The insertion hole of the flange member When the connecting tube portion is inserted, the connecting tube portion is pressed radially inward and acts on at least a large portion of the connecting tube portion in the circumferential direction to connect the connecting tube portion. Hold It is characterized by:

[0009] In the gas cock fixing structure according to claim 2 of the present invention, the connecting tube portion of the gas cock has a circumferential surface which serves as a pressed portion, and the pressing and holding member is a pressing member for pressing the insert connecting portion of the flange member. The receiving groove is The gas valve is also composed of a ring-shaped member that biases the gas valve radially inward, and the ring-shaped member acts on the circumferential surface of the connecting tube portion to maintain the connection when the connecting tube portion of the gas valve is inserted into the insertion hole portion of the insertion connection portion.

[0010] In addition, in the gas cock fixing structure according to claim 3 of the present invention, The gas valve The connecting tube portion is provided with a groove or a step portion that constitutes the pressed portion. Effect of the Invention

[0012] According to the fixing structure for a gas plug of the present invention, a pressing and holding member is provided in the insertion and connection portion of the flange member. When the connection tube portion of the gas plug is inserted into the insertion and connection portion of the flange member, the pressing and holding member presses the connection tube portion of the gas plug radially inward and acts on at least most of the connection tube portion in the circumferential direction to connect the gas plug. Hold, thus,The gas valve and the flange member can be firmly connected by this pressing and holding member. Also, since the gas valve can be connected by inserting the connecting tube portion of the gas valve into the insertion connecting portion of the flange member, the conventional tightening work is unnecessary, and the workability of the installation work of attaching the flange member to the gas valve is improved. Furthermore, since this pressure retaining member is accommodated in an accommodating groove provided on the inner surface of the insertion hole portion of the insertion connection portion on the flange member side, when the connecting tube portion of the gas valve is inserted into the insertion hole portion of this insertion connection portion, this ring-shaped member does not move in the insertion direction and is retained in a predetermined position within the insertion hole portion. Furthermore, since an annular spacer is accommodated in the accommodation groove of the insertion connection part of the flange member and a ring-shaped member is disposed on the inner periphery of this annular spacer, this annular spacer holds the ring-shaped member concentrically within the accommodation groove and acts to expand and contract while maintaining its deformation concentrically. Therefore, when the connection tube part of the gas valve is inserted, it expands in diameter while being maintained concentrically within the accommodation groove of the flange member, so that the position of the ring-shaped member does not become misaligned during insertion and poor connection due to misalignment can be eliminated. Also, when this connection tube part is inserted into the insertion connection part of the flange member, it contracts in diameter while being maintained concentrically within the accommodation groove of the flange member, so that the ring-shaped member can stably act on the connection tube part of the gas valve. Incidentally, the "at least most part" of the pressure retaining member acting on the connecting tubular portion of the gas cock means 60% or more, preferably 80% or more, and more preferably 90% or more of the entire circumference of the connecting tubular portion.

[0013] According to the fixing structure of the gas cock of the present invention, the connecting tubular portion of the gas cock has a circumferential surface which becomes the pressed portion, and the pressing and holding member is an insertion connecting portion of the flange member. housed in the accommodation groove of Since it is made of a ring-shaped member, when the connecting tube of the gas cock is inserted into the insertion hole of the flange member, the circumferential surface of the connecting tube of the gas cock is located on the radially inner side of the ring-shaped member, and in this inserted state, the ring-shaped member biases the circumferential surface of the connecting tube to the radially inner side. Therefore, the biasing action of the ring-shaped member as a pressing and holding member can firmly fix the connecting tube of the gas cock to the insertion connection part of the flange member. In this specification, the ring-shaped member is a concept that includes not only a completely circular one, but also an approximately C-shaped one with a part of the circle missing. Note that a stop ring, a snap ring, a C-ring, etc. can be used as this ring-shaped member, but it is preferable to use a stop ring.

[0014] According to the gas cock fixing structure of the present invention, Gas valve Since the connecting tube of the gas valve is provided with a groove or a step, Insert the flange into the hole When inserted, The pressing and holding member The gas valve is fitted into a groove (or step) on the gas valve side. Pressing and holding member By biasing the gas cock inwardly, the connecting tube portion of the gas cock and the insertion connecting portion of the flange member can be firmly connected and fixed. [Brief description of the drawings]

[0016] [Figure 1] 1 is an exploded perspective view showing an embodiment of a gas cock fixing structure according to the present invention; [Diagram 2] 2 is a front view showing a flange member in the gas cock fixing structure of FIG. 1. [Diagram 3] FIG. 3 is a side view showing the flange member of FIG. 2. [Figure 4] 4 is a cross-sectional view taken along line IV-IV in FIG. 2. [Diagram 5] 2 is a side view showing a state before a tubular connection portion of the gas plug is inserted into an insertion connection portion of a flange member in the gas plug fixing structure of FIG. 1. [Figure 6] 2 is a side view showing the state after the connecting tubular portion of the gas plug has been inserted into the insertion connecting portion of the flange member in the gas plug fixing structure of FIG. 1. [Figure 7] 2 is a partially enlarged cross-sectional view showing an enlarged portion of a connecting tubular portion of the gas plug and an insertion connecting portion of a flange member in the fixing structure of the gas plug in FIG. 1; [Figure 8] 2 is a partially enlarged cross-sectional view showing a state in which a tubular connection portion of the gas plug is connected to an insertion connection portion of a flange member in the gas plug fixing structure of FIG. 1; [Figure 9] 11 is a perspective view showing a state in which the gas supply pipe is connected to the joint member and before the mounting bracket is attached to the flange member. FIG. [Figure 10] 13 is a perspective view showing the state in which the mounting bracket is attached to the flange member connected to the gas cock. FIG. [Figure 11] 4 is a perspective view of the gas valve attached and fixed to the fixed wall, as viewed from the front side of the fixed wall. FIG. [Figure 12] FIG. 4 is a cross-sectional view showing the gas valve attached to the fixed wall. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of the fixing structure of a gas cock according to the present invention will be described with reference to the attached drawings. First, a gas cock 2 and a flange member 4 will be described with reference to FIG. 1. The illustrated gas cock 2 has a gas cock body 6, and an open / close valve (not shown) is attached to a gas flow path (not shown) provided in the gas cock body 6 so as to be freely opened and closed. By rotating an operating part 8 in the open direction, the open / close valve is opened to open the gas flow path, and by rotating the operating part 8 in the close direction, the open / close valve is closed to close the gas flow path. An inflow connection part 10 is provided on the inflow side of the gas cock body 6, and a supply connection part 12 is provided on the outflow side thereof, and a supply hose (not shown) for supplying fuel gas to a gas appliance, for example, is connected to the supply connection part 12.

[0018] In this embodiment, the outer peripheral surface of the inflow connection part 10 of the gas plug body 6 is formed in a hexagonal shape, and a connection tube part 14 is provided at its tip. Referring also to FIG. 7, the connection tube part 14 is a short cylindrical shape protruding toward the tip side, and has a tapered part 16 at its tip where the outer diameter gradually decreases toward the tip side. In addition, an annular groove part 18 is provided in this connection tube part 14, and this groove part 18 is provided over the entire circumference of the connection tube part 14. The bottom surface of this groove part 18 defines a circumferential surface with a circular cross section, and this circumferential surface functions as a pressed part on which a pressing and holding member 36 described later acts. In addition, a female thread part (not shown) to which a coupling member 20 described later is connected is provided on the inner peripheral surface of the connection tube part 14 of the gas plug body 6.

[0019] Next, the flange member 4 connected to the connection tube portion 14 of the gas plug body 6 will be described with reference to Fig. 1 as well as Figs. 2 to 4. The illustrated flange member 4 includes a disk-shaped flange body 22, and an insertion connection portion 24 is provided at one end side of the flange body 22 (the side facing the gas plug 2). A through opening 26 is provided at the center of the flange member 22, and this through opening 26 penetrates the insertion connection portion 24 and the flange body 22 in the axial direction (the direction perpendicular to the paper surface in Fig. 2, and the left-right direction in Figs. 3 and 4). An insertion hole portion 28 into which the connection tube portion 14 of the gas plug body 6 is inserted is defined at the axial middle portion of this through opening 26, and an insertion opening portion 30 is defined on the insertion side of this insertion hole portion 28. The insertion hole portion 28 of this insertion connection portion 24 has a shape corresponding to the outer shape of the connection tube portion 14 of the gas plug body 6, and this connection tube portion 14 is inserted into the insertion hole portion 28 through the insertion opening portion 30 on the flange member 4 side. Furthermore, the insertion opening 30 of the insertion connection portion 24 has a shape corresponding to the external shape of the inflow connection portion 10 of the gas plug body 6, and this inflow connection portion 10 is inserted into the insertion opening 30 on the flange member 4 side.

[0020] An accommodating groove 32 is provided on the inner surface of the insertion hole 28 of the flange member 4 corresponding to the groove 18 of the connecting tube portion 14 of the gas plug main body 6 (see Figures 4, 7 and 8). When the connecting tube portion 14 of the gas plug main body 6 is inserted into the insertion hole portion 28 of the flange member 4, the groove portion 18 on the gas plug main body 6 side is positioned radially inner side of the accommodating groove 32 on the flange member 4 side, as shown in Figure 8.

[0021] In this embodiment, an annular spacer 34 is housed in the housing groove 32 of the insertion hole 28 of the flange member 4, and a pressing and retaining member 36 is disposed on the radially inner side of this annular spacer 34 (i.e., on the surface side of the annular spacer 34). The annular spacer 34 is made of an elastic member formed from synthetic rubber, synthetic resin or the like, and acts to hold the pressing and retaining member 36 concentrically with respect to this housing groove 32.

[0022] The pressing and retaining member 36 is made of a metal ring-shaped member, and a stop ring is preferable as this ring-shaped member, but a snap ring, C-ring, etc. may also be used. The pressing and retaining member 36 (e.g., a stop ring) is configured to act on at least most of the connection tube portion 14 of the gas plug main body 6, for example, 60% or more of the entire circumference of the connection tube portion 14, preferably acting on 80% or more of the entire circumference, and more preferably acting on 90% or more of the entire circumference.

[0023] This ring-shaped member is preferably configured as follows: That is, the inner diameter of the ring-shaped member (pressing and retaining member 36) in its natural state (state in which the diameter is not expanded or contracted) is set to be smaller than the outer diameter of the bottom surface of the groove portion 18 of this connecting tube portion 14, and by setting it in this manner, when the connecting tube portion 14 of the gas plug main body 6 is inserted into the insertion hole portion 28 on the flange member 4 side, this ring-shaped member acts on the bottom surface of the groove portion 18 of this connecting tube portion 14 in a state in which it is somewhat expanded in diameter (in other words, in a state in which it is pressed by a diameter contracting action toward the radially inward side).

[0024] In addition, the outer diameter of the ring-shaped member (pressure-retaining member 36) in its natural state is set to be larger than the inner diameter of the insertion hole 28 of the insertion connection portion 24 on the flange member 4 side. By setting it in this manner, the ring-shaped member is maintained in a state accommodated within the accommodating groove 32 on the flange member 4 side before the connecting tube portion 14 of the gas plug main body 6 is inserted into the insertion hole portion 28 on the flange member 4 side.

[0025] Furthermore, the annular spacer 34 is accommodated in the accommodating groove 32 on the flange member 4 side, and is formed to a size such that its surface side (the side in contact with the ring-shaped member) is in contact with or close to the outer circumferential surface of the ring-shaped member in its natural state. By sizing it in this manner, the ring-shaped member (pressure-retaining member 36) accommodated in the accommodating groove 32 is held concentrically, and the ring-shaped member can be expanded or contracted radially while maintained in a concentric state.

[0026] The flange member 4 is further provided with an annular projection 38 on the other end side thereof which projects into the through opening 26, and a packing 40 is disposed inside the annular projection 38. When the connecting tubular portion 14 of the gas plug body 6 is inserted into the insertion hole portion 28 on the flange member 4 side as described below, the tip surface of the connecting tubular portion 14 abuts against the packing 40, and the packing 40 ensures a tight seal between the connecting tubular portion 14 of the gas plug body 6 and the annular projection 38 of the flange member 4.

[0027] The flange member 4 is further provided with a pair of screw through holes 42, which extend axially through the flange body 22 (perpendicular to the paper surface in FIG. 2, and left-right in FIGS. 3 and 4). A recess 46 is provided in a part of the outer periphery of the insertion connection portion 24 so that the mounting screw 44 (see FIGS. 1, 10, and 11) inserted through the screw through holes 42 does not come into contact with the insertion connection portion 24 of the flange member 4. An annular recess 48 is provided on the other end surface of the flange body 22, and an O-ring 50 is disposed in the annular recess 48. As will be understood from the description below, the O-ring 50 is interposed between the O-ring 50 and a fixed wall 52 to which the gas valve 2 is attached.

[0028] This gas tap 2 is attached to a fixed wall 52 of a kitchen or the like, for example, in the following manner. When attaching to the fixed wall 52, first, the flange member 4 is connected and fixed to the gas tap 2. This connection and fixation can be achieved by inserting the connection tube portion 14 of the inflow connection portion 10 on the gas tap main body 6 side into the insertion hole portion 28 of the insertion connection portion 24 on the flange member 4 side from the state shown in Fig. 5. When inserted in this manner, the tip surface (end surface of the tapered portion 16) of the connection tube portion 14 on the gas tap main body 6 side abuts against the annular protrusion 38 of the flange main body 22 via the packing 40 (see Fig. 8), and in this way, the inflow connection portion 10 of the gas tap 6 is attached to the insertion connection portion 24 of the flange member 4 as shown in Figs. 6 and 8.

[0029] When the connecting tube portion 14 on the gas plug body 6 side is inserted into the insertion hole portion 28 through the insertion opening portion 30 on the flange body 22 side, the ring-shaped member (pressing and holding member 36) is concentrically housed and held in the housing groove 32 of the insertion hole portion 28 by the annular spacer 34, so that the tapered portion 16 of the connecting tube portion 14 is smoothly inserted into the central space of the ring-shaped member, and the diameter of the connecting tube portion 14 is expanded concentrically toward the outer periphery in the radial direction by the insertion movement of the connecting tube portion 14. Then, when it is inserted to a predetermined position, as shown in Fig. 8, the expanded ring-shaped member (pressing and holding member 36) contracts concentrically toward the inner periphery in the radial direction and fits into the groove portion 18 of the connecting tube portion 14, and thus the connecting tube portion 14 of the inflow connecting portion 10 on the gas plug body 6 side is fixed to the insertion hole portion 28 of the insert connecting portion 24 on the flange body 22 side.

[0030] As will be understood from the above description, in this connected and fixed state, the ring-shaped member (pressing and retaining member 36) is housed in the groove 18 of the connecting tube 14 on the gas plug main body 6 side in a somewhat expanded state, so that this ring-shaped member acts to bite into the bottom surface of this groove 18, and this biting acts on at least most of the circumferential direction of this connecting tube 14 (specifically, the bottom surface of the groove 18), thus firmly connecting and fixing the gas plug main body 6 and the flange main body 22. In this fixed state, the tip of the inflow connecting portion 10 on the gas plug 2 side is inserted into the insertion opening 30 of the insertion connecting portion 24 on the flange member 4 side.

[0031] Next, a fixing metal fitting 64 having elasticity in the axial direction is inserted into the male threaded portion 62 of the coupling member 20, and in this inserted state, the male threaded portion 62 of the coupling member 20 is screwed and connected to the female threaded portion (not shown) of the connecting tube portion 14 of the gas plug main body 6 through the through opening 26 of the flange member 4. When screwed and connected in this manner, the fixing metal fitting 64 is compressed between the other surface (back surface) of the flange member 4 and the tool hook hexagonal portion 66 of the coupling member 20, and by configuring in this manner, the flange member 4 is biased toward the gas plug 2 by the elasticity of the fixing metal fitting 64, and is held in a state where it is firmly pressed toward the connecting tube portion 14.

[0032] 9, the gas supply pipe 68 is pulled out to the indoor side through a pull-out opening 70 provided in the fixed wall 52, and the tip side of the pulled-out gas supply pipe 68 is inserted into the insertion opening 73 of the mounting bracket 72. Note that this pull-out opening 70 is formed in advance at a predetermined portion (i.e., the mounting portion) on the side of the fixed wall 52 where the gas valve 2 is to be attached.

[0033] Moreover, the mounting fitting 72 may be a known one disclosed in, for example, JP 2006-266366 A. The mounting fitting 72 includes a support body 74 and a pair of abutment plates 76 attached to the support body 74 in a shape changeable manner, for example, by leaf springs, and the pair of abutment plates 76 are configured to be shape changeable between a basic shape (shape shown in Figs. 1, 9, 10, and 12) in which they are parallel to the support body 74, and a deformed shape in which they are deformed obliquely into a substantially V-shape with respect to the support body 74. In the basic shape, the pair of abutment plates 76 are in an expanded state and are larger than the drawer opening 70 on the fixed wall 52 side, and cannot be inserted or removed through the drawer opening 70, but in the deformed shape, the pair of abutment plates 76 are in a state of inward inclination in a direction approaching each other, and are smaller than the drawer opening 70, and can be inserted or removed through the drawer opening 52.

[0034] 10, a tip pipe portion 78 (e.g., a flexible pipe portion) of the gas supply pipe 68 is connected to the joint member 20, and further, a mounting screw 44 is passed through the screw through hole 42 of the flange member 4 and screwed into a threaded hole 80 provided in the support body 74 of the mounting bracket 72. In this manner, the gas valve 2 is connected to the tip portion of the gas supply pipe 68 via the joint member 20, and the mounting bracket 72 is fitted onto the gas supply pipe 68.

[0035] Thereafter, the mounting bracket 72 is deformed and inserted into the inside of the fixed wall 52 through the drawer opening 70 of the fixed wall 52, and with the mounting bracket 72 positioned inside the fixed wall 52, the pair of mounting screws 44 are tightened from the front surface side (i.e., the room side) of the fixed wall 52. When tightened in this manner, the mounting bracket 72 is pulled toward the fixed wall 52, and thus, as shown in Figures 11 and 12, the flange member 4 and mounting bracket 72 attached to the gas valve 2 sandwich the fixed wall 52 from both sides, and thus the gas valve 2 is attached to the fixed wall 52 as required. In this mounted state, the mounting bracket 72 has the coupling member 20 inserted therein, as shown in Figure 12.

[0036] While one embodiment of the gas valve fixing structure according to the present invention has been described above, the present invention is not limited to this embodiment, and various modifications and changes are possible without departing from the scope of the present invention.

[0037] In the above embodiment, the groove 18 is provided in the connecting tube 14 on the gas cock 2 side, but a step may be provided instead of the groove 18, in which case the pressing and retaining member 36 (ring-shaped member) fits into the step and bites into the bottom surface of the step. It is not necessary to provide such a groove or step, and the connecting tube 14 may be made to bite into the outer circumferential surface (circular surface) of the connecting tube 14.

[0038] Furthermore, for example, in the above-described embodiment, both the annular spacer 34 and the pressing retaining member 36 (ring-shaped member) are accommodated in the accommodating groove 32 of the insertion hole portion 28 on the flange member 4 side, but when this pressing retaining member 36 can be expanded or contracted as required while accommodated in the accommodating groove 32, the annular spacer 34 can be omitted. [Explanation of symbols]

[0039] 2 Gas valve 4 Flange member 6 Gas valve body 10 Inlet Connection 14 Connection tube 18 Groove 22 Flange body 24 Insertion joint 28 Insertion hole 32 Storage Groove 34 Annular spacer 36 Pressing and holding member (ring-shaped member) 52 Fixed wall 68 Gas supply pipe 72 Mounting bracket

Claims

1. A fixing structure for a gas plug, comprising: a gas plug having a connecting tubular portion; and a flange member having an insertion connection portion, the connecting tubular portion of the gas plug being inserted and connected to an insertion hole of the insertion connection portion of the flange member, A fixing structure for a gas plug, characterized in that an inner surface of the insertion hole portion of the flange member is provided with an accommodating groove, an annular spacer is accommodated in the accommodating groove, and a pressing and retaining member is accommodated on the inner side of the annular spacer, the annular spacer acts on the pressing and retaining member to hold it concentrically, and the pressing and retaining member presses the connecting tube portion of the gas plug radially inward when the connecting tube portion is inserted into the insertion hole portion of the flange member and acts on at least most of the connecting tube portion in the circumferential direction to maintain the connection.

2. 2. The fixing structure of a gas plug as described in claim 1, characterized in that the connecting tubular portion of the gas plug has a circumferential surface that serves as a pressed portion, the pressing and retaining member is composed of a ring-shaped member that is accommodated in the accommodating groove of the flange member and biases it toward the radially inner side, and the ring-shaped member acts on the circumferential surface of the connecting tubular portion to maintain the connection when the connecting tubular portion of the gas plug is inserted into the insertion hole of the insertion connection portion.

3. A fixing structure of a gas tap as described in Claim 2, characterized in that the connecting tube portion of the gas tap is provided with a groove portion or a step portion that constitutes the pressed portion.

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