JP2016031127A - Channel connecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a channel connecting device comprising: a liquid receptacle having a connection cylinder accommodated in the opening of a receptacle body; and a plug body having a plug cylinder, wherein an O-ring externally fitted for holding the inside of the connection cylinder in a water-tight state is externally fitted, and a structure for preventing the residual circulating water from being scattered into a room even if the plug body is forcibly extracted from the liquid receptacle.SOLUTION: At the open end of an opening 30, there is tensed a film body 33 made of an elastic material. In the film body 33, there is formed a cut port part 34 for inserting a plug cylinder 21 while expanding and shrinking in accordance with the diameter of the trunk of the plug cylinder, such that the center of the cut port part 34 is aligned with the centers of the opening 30 and a connection cylinder 11.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a flow path connection device, and more particularly to a flow path connection device including a liquid outlet having a connection cylinder and a plug body having a plug cylinder detachably connected to the connection cylinder.

  FIG. 8 shows a front view of a general liquid outlet (50) and a partially cutaway perspective view of a plug body (5) connected thereto. The liquid outlet (50) is installed on the wall surface (W), etc., and a horizontally long oval guide cylinder (57) is open on the front of the decorative plate (59). A socket body (58) having a horizontally long oval shape having a pair of openings (58a) (58b) is housed therein. In these openings (58a) and (58b), connecting pipes (50a) and (50b) for connecting the hot water circulation path are installed in a state where they are recessed.

  The plug body (5) projects from the casing body (53) with a surrounding cylinder (56) having a size that can be inserted between the guide cylinder (57) and the outlet body (58). 56) includes a pair of plug cylinders (5a) and (5b) that are detachably connected to the connection cylinders (50a) and (50b). In the connecting cylinder (50a) (50b) and the plug cylinder (5a) (5b), the valve bodies (51) (52) for opening and closing the respective flow paths are accommodated in a state of being biased to the closed state. The O-rings (55) and (55) for connecting the connecting cylinders (50a) and (50b) in a watertight state are fitted on the outer periphery of the plug cylinders (5a) and (5b).

  When the surrounding cylinder (56) is inserted into the guide cylinder (57) and the plug cylinder (5a) (5b) is pushed into the connecting cylinder (50a) (50b), the mutual valve bodies (51) (52) In the initial stage of connection before the valve opens, the O-ring (55) enters the connection tube (50a) (50b) and connects the plug tube (5a) (5b) to the connection tube (50a) (50b). The inside is kept in a watertight state. Thereafter, when the plug body (5) is further pushed in and the plug cylinders (5a) and (5b) are in the connection completion state, the valve bodies (51a) in the plug cylinders (5a) (5b) and the connection cylinders (50a) (50b) ) (52) opens against each urging force, and fluid circulates between the heater and the radiator via the plug body (5) and the liquid outlet (50).

  Thus, in the conventional one, the connection of the plug body (5) before the valve bodies (51) (52) in the plug cylinder (5a) (5b) and the connection cylinder (50a) (50b) are opened. A stroke of a certain length occurs from the initial stage to the connection completion state where the valve is opened, or until the plug body (5) is pulled out from the connection completion state. For this reason, when removing the plug body (5) in the connected state, the plug body (5) is stronger than the frictional force on the inner peripheral surface of the connection cylinder (50a) (50b) of the O-ring (55). The plug body (5) may be pulled out vigorously by being forcibly pulled.

  During the withdrawal of the plug body (5), after the valve bodies (51) (52) of the plug cylinder (5a) (5b) and the connection cylinder (50a) (50b) are closed, and In a state where the O-ring (55) is still located in the connecting cylinder (50a) (50a), a part of the circulating water remains between the tips of both valve bodies (51) (52) in the closed state. A space is formed. From this state, when the plug body (5) is further moved in the pulling direction, the space is temporarily brought into a negative pressure state by the O-ring (55), and the plug body (5) is withdrawn vigorously from the liquid outlet (50). And since the said negative pressure state is eliminated rapidly, there exists a problem that the circulating water which remains in the said space splashes outside, and soils a room | chamber interior.

The invention disclosed in Japanese Patent No. 3052033 (Patent Document 1) has been invented as a means for preventing the circulating water from scattering when the plug body (5) is pulled out.
This is provided with a recessed portion (54) (54) on the open end face of the connecting tube (50a) (50b), and by communicating the space with the outside through the recessed portion (54) (54), It is the structure which cancels | releases a negative pressure state.

Utility Model Registration No. 3052033

  However, since this effect is exhibited when the plug body (5) is slowly pulled out from the liquid outlet (50), the effect can be obtained if the plug body (5) is pulled out quickly and vigorously. Is difficult.

The present invention includes a wall-mounted liquid outlet in which a pair of connecting cylinders are housed in an opening that opens to the front side of the outlet body, and a circulation channel that is detachably connected to the connecting cylinder. A plug body having a pair of plug cylinders
In the connecting cylinder, an outlet valve and an outlet spring for energizing the outlet valve in the valve closing direction are housed,
A plug valve and a plug spring that urges the plug valve in a valve closing direction are accommodated in the plug cylinder,
In the "flow path connecting device in which an annular seal member that keeps the connection portion with the connection tube in a watertight state is fitted on the outer periphery near the open end of the plug tube", the plug body is pulled out from the liquid outlet vigorously. Thus, it is an object to prevent the circulating water remaining in the space located between the closed plug valve and the tip of the outlet valve from scattering into the room even when the drawing speed is increased.

The flow path connection device according to the present invention is as follows: “A film body made of an elastic material is stretched at the open end of the opening,
The film body is formed with a cut portion that allows the plug cylinder to be inserted while expanding and contracting according to the diameter of the body of the plug cylinder.
The center of the cut portion coincides with the center of the opening and the connecting tube ”.

The membrane body is made of an elastic material, and at the open end of the opening, that is, on the front surface of the outlet body, the center of the cut portion provided in the membrane body coincides with the center of the opening and the center of the connection tube accommodated inside the opening. So that it is stretched. Accordingly, when the plug cylinder is inserted toward the cut portion of the film body, the plug cylinder is inserted into the center of the connection cylinder. At this time, the cut portion of the film body elastically expands in accordance with the outer diameter of the distal end portion and the barrel portion of the plug cylinder, and the constituent edges of the cut portion are brought into close contact with the trunk portion of the plug cylinder by the elastic force. However, it is elastically deformed to bend in the connecting direction.
Furthermore, when the plug cylinder is pushed into the connection cylinder until the connection is completed, the plug valve and the outlet valve open against each other against the biasing force of the plug spring and the outlet spring, and the connection of the plug body to the liquid outlet is completed. . In this state, the plug body and the liquid outlet are maintained in a connected state by an engagement lock mechanism provided separately.

When the engagement lock mechanism is released and the plug body is moved in the direction of pulling out from the liquid outlet, the valve body in the plug cylinder and the connection cylinder is closed by the urging force of the plug spring and the outlet spring, and at the same time The film body elastically returns to its original shape when the plug tube is separated from the cut portion while the periphery of the portion is elastically bent in the drawing direction while closely contacting the body of the plug tube.
When the plug cylinder is moved away from the connection cylinder, the vicinity of the open end of the connection cylinder is temporarily brought into a negative pressure state by the sealing member fitted on the plug cylinder, and the negative pressure state is released by pulling out the plug cylinder. When this is done, the circulating water remaining on the distal end side of the connecting tube scatters from the vicinity of the open end of the plug tube, but the membrane body is stretched at the open end of the opening in which the connecting tube is accommodated. This film body serves as a barrier to prevent circulating water from splashing indoors.

  In the above flow path connecting device, “the vent and the circulating water drain are communicated to the outside at the opening of the outlet body between the open end of the connecting cylinder and the membrane body. When the plug cylinder is pulled out, the space in the connection cylinder where the film body is in contact with the sealing member of the plug cylinder and has a negative pressure communicates with the outside through the vent, so the negative pressure is eliminated and the circulating water is removed. Does not scatter to the indoor side, and a small amount of circulating water is guided to the circulating water receiver through the drain.

  In the above flow path connecting device, in the case where “the cut portion is a through hole having a diameter smaller than the outer diameter of the body portion of the plug cylinder”, the plug cylinder expands the diameter of the through hole and simultaneously connects the periphery thereof. It is inserted into the connecting tube while being elastically deformed so as to bend in the direction, and when the plug tube is moved in the pulling direction, the periphery of the through hole is elastically deformed so that it is bent in the pulling direction, and the plug body is removed from the liquid outlet. At the same time, the film body is elastically restored to the original shape in which a through hole having a smaller diameter than the body of the plug is opened at the center. In this case, the annular portion formed around the through-hole serves as a barrier that prevents the circulating water from scattering into the chamber.

  In addition, in the case where “the cut portion is a slit having a length substantially matching the outer diameter of the plug cylinder”, the plug cylinder is opened in the connection cylinder while elastically opening so that both sides of the slit bend in the connection direction. When the plug tube is inserted and moved in the pulling direction, both sides of the slit bend in the pulling direction and the plug body is removed from the liquid outlet, and at the same time, the slit is closed. It becomes a mode to be blocked.

  Further, in the above-described flow path connecting device, in the case where “the front end surface of the plug valve in the closed state is set to be flush with the open end surface of the plug cylinder”, the connection cylinder is connected to the plug cylinder. When the valve is pulled out, the tip of the plug valve in the closed state is set to be flush with the open end surface of the plug cylinder, so that the circulating water does not remain at the open end of the plug cylinder.

  Further, among the above-described flow path connection devices, the “film body is detachably attached to the open end” can be removed from the outlet body and replaced when the film body is damaged.

  According to the present invention, the plug body is pulled out from the liquid outlet vigorously, and even if the circulating water remaining in the space outside the valve body in the closed state is scattered to the open end side of the opening, the plug body is stretched at the open end. Since the formed film body serves as a barrier to prevent the circulating water from scattering into the room, the room is not contaminated by the scattered circulating water.

In addition, since the plug cylinder can be inserted in a state in which the constituent end of the cut portion provided in the film body is in close contact with the body of the plug cylinder, the plug cylinder can be inserted and removed when the plug cylinder is inserted. Foreign matters and the like adhering to the outer periphery of the trunk portion and the seal member can be removed by wiping with the constituent edges of the cut portion.
In addition, since the center of the cut portion provided in the film body is aligned with the center of the opening of the outlet body, the plug tube can be correctly and easily attached to the connection tube with the cut portion as a mark.
In the case where the outlet body and the drainage port are provided in the opening of the outlet body between the open end of the connection tube and the membrane body, the circulating water remaining when the plug tube is removed is circulated through the drainage port. Since the water can be guided to the water receptacle, the circulating water does not remain in the outlet main body connecting tube, and the connecting tube portion can be kept dry at all times.
In particular, in the case where the cut portion has a small diameter through-hole, the film body adheres to the entire outer periphery of the plug cylinder when the plug cylinder is inserted and removed, so that the dust removal effect of the seal member and the drainage of the circulating water are further improved.

In addition, in the case where the cut portion is a slit, since the opening of the outlet body is closed over the entire area with the membrane body in the state where the plug cylinder is pulled out, the scattering of the circulating water into the chamber is surely blocked. Can do.
In addition, if the tip of the plug valve in the closed state is positioned on the same plane as the open end of the plug cylinder so that no circulating water remains in the plug cylinder, the tip of the closed plug valve and the outlet The amount of circulating water remaining in the space between the valve tips can be minimized, and the circulating water does not leak from the tip of the plug cylinder when the plug body is removed.
Further, when the membrane body is provided removably at the open end of the front opening of the outlet body, it can be easily replaced even if the cut portion of the membrane body is damaged by detaching the plug cylinder.

It is sectional drawing which shows the mode before the connection of the liquid outlet and plug body of the flow-path connection apparatus of embodiment of this invention. It is a disassembled perspective view of the liquid outlet of the flow-path connection apparatus of embodiment of this invention. It is a principal part expanded sectional view which shows the middle of connecting the plug cylinder of a plug body to the connection cylinder of the liquid outlet of the flow-path connection apparatus of embodiment of this invention. It is sectional drawing which shows the connection completion state of the liquid outlet and plug body of the flow-path connection apparatus of embodiment of this invention. It is a principal part expanded sectional view which shows the middle of removing the plug cylinder of a plug body from the connection cylinder of the liquid outlet of the flow-path connection apparatus of embodiment of this invention. FIG. 6 is an essential part enlarged cross-sectional view showing a state where the plug body is further pulled out from the state of FIG. 5. It is explanatory drawing of the film body employ | adopted as the flow-path connection apparatus of other embodiment of this invention. It is a perspective view of the liquid outlet and plug body of the conventional flow-path connection apparatus.

EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated, referring an accompanying drawing.
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a connection tube (11) and a plug tube (21) before the plug body (2) is connected to the liquid outlet (1) in the embodiment of the present invention. It is a disassembled perspective view of a liquid outlet (1).

First, the liquid outlet (1) will be described.
As shown in FIGS. 1 and 2, the liquid outlet (1) is installed on the wall surface (W) in the room, and is provided with a pair of connecting cylinders (11) and (11) for connecting the hot water circulation path. An outlet body (3), a mounting member (31) for attaching the outlet body (3) to the wall surface (W), and a decorative plate (100) for covering the outlet body (3) and the mounting member (31) from the front side. It has.
As shown in FIG. 2, the decorative plate (100) has an oblong guide tube portion (10) that is open to the front for inserting a surrounding tube (20) of the plug body (2) described later. The outlet body (3) having a horizontally long oblong front side end surface is accommodated in the guide tube portion (10). The outlet body (3) is formed with a pair of openings (30), (30) arranged in a horizontal direction, and the plug body (2), which will be described later, is located at a slightly recessed position in each opening (30). Each of the connecting tubes (11) to which the plug tube (21) can be connected is accommodated. As shown in FIG. 1, a pair of hot water pipes (4) and (4) serving as a forward path and a return path from the heater are connected to each connecting cylinder (11).
Also, inside each connecting cylinder (11), the outlet valve (16), the valve seat (17), and the outlet valve (16) are crimped to the valve seat (17) to close the connecting cylinder (11). There is a built-in outlet spring (18) that biases in the direction.

The end surface on the front side of the outlet body (3) is covered with a film body (33) made of the same horizontally long oval elastic material. In the membrane body (33), each position corresponding to the opening (30) (30) of the outlet body (3) has a smaller diameter than the outer diameter of the body of the plug cylinder (21) of the plug body (2) described later. Each through hole (34) (34) is formed. This through hole (34) corresponds to a cut portion as an invention specific matter.
A mounting plate (35) of the same shape and size as the film body (33) is attached to the front side of the film body (33), and the through hole (34) of the film body (33) of the mounting plate (35). In each position corresponding to (34), a through hole (36) (36) is formed having a size that allows the plug cylinder (21) to be inserted with a space.

The membrane body (33) is attached to the front end surface of the outlet body (3), and the attachment plate (35) is attached to the membrane body (33), and the center of the attachment plate (35) and the membrane body (33) is attached. The screw (32) is inserted into the screw through hole (35a) (33a) formed in each, and screwed into the screw hole (3a) formed in the center of the front end surface of the outlet body (3). The membrane body (33) is attached to the front side end face of the outlet body (3) by the mounting plate (35), and has the openings (30), (30), the through holes (34), (34), and the through holes (36). (36) will be located concentrically.
The outlet body (3) has a vent (37) that opens upward near the front end, and a drain (13) that is larger than the vent (37) is provided below the front end. A structure in which a circulating water receiver (14) is provided below (13) can be adopted.

Next, the plug body (2) will be described.
As shown in FIG. 1, the plug body (2) includes a main body portion (20a) covering a pair of hot water hoses (40) (40) connected to a radiator such as a hot water heater, and a main body portion (20a ) And a casing (200) made of a synthetic resin formed in a substantially L shape from an enclosing cylinder (20) protruding in a right angle direction.

  The surrounding tube (20) is a tubular body having a size that can be inserted into the guide tube portion (10) opened in the decorative plate (100) of the liquid outlet (1). The holder (23) is accommodated. The holding body (23) holds a pair of plug cylinders (21) and (21) detachably connected to the connection cylinders (11) and (11) described above and holds the plug cylinder (21) in parallel with each other. The tip end portion of the projection protrudes from the holding body (23). Two O-rings (22a) and (22b) as sealing members are mounted on the outer peripheral surface in the vicinity of the tip of the plug cylinder (21) so as to be positioned in the front-rear direction. These O-rings (22a) and (22b) are connected to the inner peripheral surface of the connecting tube (11) and the plug tube (21) with the plug tubes (21) and (21) inserted and connected to the connecting tubes (11) and (11). ) Is maintained in a watertight state.

Also, in the plug cylinder (21), the plug valve (26), the valve seat (27), and the plug valve (26) are pressed against the valve seat (27) to urge the plug cylinder (21) in the valve closing direction. A plug spring (28) is built in, and a pair of hot water hoses (40) and (40) from the above-described heater are connected to the base end side portion of the plug cylinder (21).
Note that the plug valve (26) is set so that its tip end face is flush with the open end face of the plug cylinder (21) in the closed state biased to the valve seat (27). .
Although not shown, the liquid outlet (1) and the plug body (2) have an engagement lock mechanism that engages with each other and holds the connection between them, and a release mechanism for releasing this engagement. Is provided.

Connection and disconnection of the hot water circuit will be described.
In order to connect the plug body (2) to the liquid outlet (1), the surrounding cylinder (20) of the plug body (2) is inserted into the guide cylinder portion (10) of the liquid outlet (1). Then, the plug cylinder (21) of the plug body (2), the through hole (36) of the mounting plate (35), the through hole (34) of the membrane body (33), and the opening (30) of the outlet body (3) ) And the connecting cylinder (11) are positioned concentrically in this order.In this state, when the enclosing cylinder (20) of the plug body (2) is pushed into the guide cylinder section guide cylinder section (10), the plug The tip of the cylinder (21) is inserted into the connection cylinder (11) through the through hole (36) of the mounting plate (35) and the through hole (34) of the film body (33).

Since the through hole (34) of the membrane body (33) is formed with a diameter smaller than the outer diameter of the body portion of the plug cylinder (21), when the tip of the plug cylinder (21) passes through the membrane body (33), As shown in FIG. 3, the peripheral part of the through hole (34) is pushed and elastically deformed in the direction of bending toward the back side of the opening (30), and the plug cylinder (21) is inserted into the connection cylinder (11). As shown in FIG. 4, the diameter of the through hole (34) of the film body (33) increases, and the periphery of the through hole (34) elastically adheres to the body of the plug cylinder (21). It becomes the mode to do.
The state of FIG. 4 is a state where the connection of the enclosing cylinder (20) of the plug body (2) to the guide cylinder (10) of the liquid outlet (1) is completed, and the outlet valve (16) and the plug valve (26) are The valve spring opens against the biasing force of the outlet spring (18) and the plug spring (28), and the hot water circulation path between the heater and the radiator is connected.
In this state, the plug body (2) is held in a locked state by the engagement lock mechanism described above.

Thereafter, in order to remove the plug body (2) from the liquid outlet (1), after the engagement by the engagement lock mechanism is released by the release mechanism, the casing (200) of the plug body (2) is pulled indoors.
As the plug body (2) is moved in the removal direction, the peripheral portion of the through hole (34) of the film body (33) that is in close contact with the outer periphery of the body of the plug cylinder (21) is as shown in FIG. As shown in FIG. 5, when the plug cylinder (21) is elastically bent in the moving direction and the tip end surface of the plug cylinder (21) is completely pulled out from the opening (30) of (3), it is shown in FIG. Thus, after the peripheral edge of the through-hole (34) is in close contact with the distal end surface of the plug cylinder (21), the membrane body (33) is in its original state (state shown in FIG. ) Return to elasticity.

As shown in FIGS. 5 and 6, when the plug body (2) is moved in the pulling direction, the outlet valve (16) of the connecting tube (11) is pressed against the valve seat (17) by the outlet spring (18). At the same time that the valve is closed, the plug valve (26) of the plug cylinder (21) is crimped to the valve seat (27) by (28) to be closed, and the outlet valve (16) in the closed state and the plug are plugged. Circulating water leaking from the connection tube (11) remains in the space (15) between the tips of the valve (26).
Since the plug valve (26) is configured so that its tip surface is flush with the tip surface of the plug cylinder (21) when the valve is closed, circulating water remains at the tip of the plug cylinder (21). Never do.

In the connected state, the O-rings (22a) and (22b) of the plug cylinder (21) are in close contact with the inner peripheral surface of the connection cylinder (11), and the plug cylinder (21) is moved away from the connection cylinder (11). Even after the outlet valve (16) and the plug valve (26) are closed, the periphery of the through hole (34) of the membrane body (33) is elastically adhered to the O-ring (22a) (22b). Thus, the inside of the connection tube (11) is kept in an airtight state, so that the space (15) is in a negative pressure state as the plug tube (21) is moved in the pulling direction from the connection tube (11). When the plug body (2) is further moved in the pulling direction and the plug cylinder (21) is pulled out from the opening (30) of the outlet body (3) with vigorous force, the negative pressure state is suddenly eliminated, so the space ( 15) Circulating water remaining inside splashes outward.
At this time, since the membrane body (33) is attached in an elastically restored state at the open end of the opening (30) of the outlet body (3), the circulating water remaining in the space (15) is outward. Even if it is scattered, the peripheral area of the through hole (34) of the membrane body (33) becomes a barrier, and the circulating water is blocked by the membrane body (33) and does not splash into the room.
A vent (37) is provided so as to open upward near the front end of the outlet body (3), and a drain (13) larger than the vent (37) is provided below the front end. In the structure where the circulating water receiver (14) is provided below the drain port (13), when the plug body (2) is pulled out and the state shown in FIG. The circulating water remaining in this portion is guided to the circulating water receiver (14) through the drain port (13). Therefore, when the plug body (2) is removed from the state shown in FIG. 6, the negative pressure in the space (15) is eliminated and the remaining circulating water flows from the drain port (13) to the circulating water receiver (14). Therefore, the circulating water will not splash indoors.

In the above embodiment, the film body (33) is formed with the through hole (34) having a diameter smaller than the outer diameter of the body portion of the plug cylinder (21), but instead of the through hole (34), shown in FIG. In this manner, the slit (24) may be formed. When the length of the slit (24) is substantially matched to the outer diameter of the body of the plug cylinder (21) and the slit (24) is pushed with the plug cylinder (21), the slit (24) The plug cylinder (21) is inserted into the connecting cylinder (11) while elastically deforming in the direction of being pushed and pushed at the tip of the plug, and elastically adhering both side portions to the outer periphery of the body of the plug cylinder (21). It will be followed.
In this case, when the plug cylinder (21) is pulled out, the open end (30) of the outlet body (3) is closed with the membrane body (33) over the entire area, so the plug body (2 ) Can be pulled out from the liquid outlet (1) vigorously, and the scattered water remaining in the space (15) can be reliably dammed by the film body (33) regardless of the drawing speed.

  The peripheral portion of the through hole (34) or slit (24) formed in the film body (33) is in a state of elastically contacting the body of the plug tube (21), and the plug tube (21) is connected in the connecting direction. Or, since it can be inserted in the pull-out direction, foreign matter adhering to the outer periphery of the body of the plug tube (21) or the O-ring (20a) (20b) can be removed when the plug tube (21) is connected or pulled out. It can be removed by wiping at the periphery of the through hole (34) or at both sides of the slit (24).

  Further, since the membrane body (33) is attached by screwing to the front end surface of the outlet body (3) exposed from the decorative plate (100) of the liquid outlet (1) to the room, the membrane body (33) Even if the through-hole (34) and the slit (24) of this are damaged, the screw (32) can be removed and easily replaced.

(1) ・ ・ ・ ・ ・ ・ ・ ・ ・ Liquid outlet
(10) ... guide cylinder
(11) ... Connection tube
(16) ・ ・ ・ ・ ・ ・ ・ ・ ・ Outlet valve
(18) ..... outlet spring
(2) ・ ・ ・ ・ ・ ・ ・ ・ ・ Plug body
(21) ..... Plug cylinder
(22a) (22b) ... O-ring (seal member)
(26) ... Plug valve
(28) ... Plug spring
(3) ・ ・ ・ ・ ・ ・ ・ ・ ・ Outlet body
(30) ... Opening
(33) ... Membrane
(34) ・ ・ ・ ・ ・ ・ ・ ・ ・ Through hole (cut)

Claims (6)

A wall-mounted liquid outlet in which a pair of connecting cylinders are housed in an opening that opens to the front side of the outlet body, and a pair of plug cylinders that are detachably connected to the connecting cylinder to form a circulation channel With a plug body with
In the connecting cylinder, an outlet valve and an outlet spring for energizing the outlet valve in the valve closing direction are housed,
A plug valve and a plug spring that urges the plug valve in a valve closing direction are accommodated in the plug cylinder,
In the flow path connection device in which an annular seal member that holds the connection portion with the connection tube in a watertight state is fitted on the outer periphery near the open end of the plug tube,
A film body made of an elastic material is stretched at the open end of the opening,
The film body is formed with a cut portion that allows the plug cylinder to be inserted while expanding and contracting according to the diameter of the body of the plug cylinder.
The flow path connecting device in which the center of the cut portion coincides with the center of the opening and the connection tube.   The flow path connecting device according to claim 1, wherein an opening of the outlet main body between the open end of the connection tube and the membrane body is provided so as to communicate with a vent and a drain of circulating water. Channel connection device.   3. The flow path connection device according to claim 1, wherein the cut portion is a through-hole having a diameter smaller than an outer diameter of a body portion of the plug cylinder.   3. The flow path connection device according to claim 1, wherein the cut portion is a slit having a length substantially matching an outer diameter of the plug cylinder.   5. The flow path connecting device according to claim 1, wherein a front end surface of the plug valve in a valve-closed state is set to be positioned on the same plane as an open end surface of the plug cylinder. Connected device.   6. The flow path connection device according to claim 1, wherein the film body is detachably attached to the open end.

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