JP4753362B2 - Ventilation equipment - Google Patents

Description

  The present invention relates to a ventilator that uses a solenoid as an actuator and opens and closes a ventilation port by applying the solenoid to the solenoid, and particularly relates to an improvement of a ventilator that can be opened and closed regardless of application.

  In recent years, various buildings have become airtight, and ventilation devices such as ventilation fans and ventilation dampers are indispensable. In particular, in a highly airtight apartment or the like, when a ventilation fan such as a range hood is operated, a negative pressure is generated in the room, and an event that makes it difficult to open and close the doors, doors, and doors of the damper for ventilation occurs.

  Conventionally, a ventilator as shown in FIG. 10 (a) is known as a solution to the problem of opening / closing the ventilating door due to such negative pressure. Briefly, in the figure, reference numeral 1 denotes a ventilation port, 2 denotes a door that is supported to be opened and closed by a support shaft 2a, and the door 2 is urged in a closing direction by a leaf spring 3 having a weak urging force. It has become. With such a structure, the door 2 moves in the opening direction against the urging force of the leaf spring 3 and the like due to the negative pressure in the room.

  However, according to such a conventional structure, it is necessary to have a structure in which the door 2 is not opened by a strong wind from the outside, and a structure that matches the air volume (negative pressure) of the ventilation fan. Was necessary. Further, when such a structure is adopted, there is a problem that the leaf spring 3 (or the urging means such as a coil spring) that urges the door 2 in the closing direction needs to be considerably large.

  In addition, ventilating devices such as the above-mentioned ventilation dampers can be effective when natural ventilation is sufficient, but they can be opened and closed in conjunction with a ventilator so as not to forget to open or close them. An electric ventilator that can perform the above is common.

  As such an electric ventilator, one having a structure as shown in FIG. 10B is generally known. Briefly explaining this, 5 is a wire for pulling the door 2 in the closing direction, and 6 is an electric motor having a winding portion for winding the wire 5. The door 2 is normally biased in the opening direction by a biasing means (not shown), and is closed by pulling the wire 5 when necessary.

  However, such a conventional structure has a drawback that the mounting portion on the indoor side of the apparatus becomes large and the cost increases due to the curve ratio of the wire 5, the layout of the motor 6, the size of the motor 6, and the like. In addition, there is a problem in that the door 2 protrudes greatly indoors during the opening operation.

  Moreover, in the electric type ventilator as described above, it is desired that it can be opened and closed manually. In order to meet such demands, in addition to the electric door opening and closing mechanism, a mechanism that can be fixed in a closed state manually or in the event of a strong wind is not available It has already been proposed (see, for example, Patent Document 1).

  Briefly describing such a conventional ventilator, this ventilator has two butterfly doors that open and close the vents, and these two doors are closed in a direction to be closed by a biasing means such as a leaf spring. In addition to energizing, the structure is opened and closed by advancing and retracting the movable core of the solenoid. And the screw shaft which contact | abuts said movable core is provided, and it has the structure which can open and close a door also manually by rotating this screw shaft.

  According to such a structure, since the door can be opened in conjunction with the operation of the ventilation fan, there is no obstacle to the opening and closing of the door due to the negative pressure described above, and the ventilation opening is manually operated for indoor ventilation. There is an advantage that it can be opened with.

Japanese Utility Model Publication No. 63-26675

  However, the conventional structure described above requires a biasing means such as a leaf spring or a torsion spring or a coil spring for biasing the door in the closing direction (or the opening direction). The stress applied to the abutting surface with the member that abuts in the closed state is large, and the structure has to be large and robust.

  In particular, in a building where airtightness is required, airtightness is required at the above-described abutting surface portion. Therefore, in consideration of the influence of the urging force, a seal structure that can cope with changes over time is adopted. There is also a problem that the structure is complicated.

  The present invention has been made in view of such circumstances, and can eliminate the biasing means such as a leaf spring, reduce the number of components, simplify the overall configuration, and reduce the size and cost. Another object of the present invention is to obtain a ventilator that can ensure the required airtightness and strength.

In order to meet such a purpose, a ventilator according to the present invention (the invention according to claim 1) is provided with a door that is pivotally supported so as to open and close a ventilation opening, and to open and close the door. An actuator having a movable piston that is moved back and forth, and a support shaft holding portion that rotatably supports the support shaft portion of the door, and the actuator is operated so that the support shaft portion follows the movement of the movable piston. And a holder member that holds the retainer member in a state in which the retainer member can be moved forward and backward, and protrudes from the holder member toward the retainer member so that the base end portion of the door faces in a closed state. An engagement step portion is provided that faces the movable piston side surface of the base end portion of the door through the notch so that the engagement step portion can be engaged. The base end portion of the engagement step portion is opened when the door is opened. Engage side as working point That the first and the engaging portion, the engaging portion facing the holder member engageable with the engagement surface in the thickness direction of the base end portion of projecting the door to the retainer member provided on the side of the engaging convex portion The corner portion is a second engaging portion that engages with the base end engaging surface when the door is closed, and the door is opened, and when the door is opened, according to the movement of the movable piston. The retainer member is moved in a direction away from the holder member, and when the door is closed, the retainer member is moved in a direction approaching the holder member according to the movement of the movable piston. To do.

  The ventilator according to the present invention (the invention according to claim 2) is the ventilator according to claim 1, wherein the first engaging portion is engaged with the base end side surface of the door at the time of opening operation. The second engagement portion maintains a non-engagement state with the base end portion side of the door, and the second engagement portion engages with the base end portion engagement surface of the door during the closing operation of the door, The first engagement portion is configured to maintain a non-engagement state with the base end side of the door.

  The ventilator according to the present invention (the invention according to claim 3) is the ventilator according to claim 1 or 2, wherein the support shaft portion of the door is provided at an eccentric position in the thickness direction of the door. It is characterized by.

  The ventilator according to the present invention (invention according to claim 4) is the ventilator according to claim 1, claim 2 or claim 3, wherein the engaging step portion and the engaging convex portion of the holder member are provided on the door. It is formed by shifting the position in the axial direction of the support shaft portion.

  A ventilating apparatus according to the present invention (invention according to claim 5) is the ventilating apparatus according to any one of claims 1 to 5, wherein the movable piston of the actuator is located at the end opposite to the retainer member. A manual closing means for forcibly moving the movable piston forward and backward by manual operation is provided.

  The ventilator according to the present invention (the invention according to claim 6) is the ventilator according to claim 5, wherein the manual closing means is a position eccentric from the axis of the movable piston and supports a direction orthogonal to the axis. An operation lever provided as a shaft so that it can be rotated, and a pressure that selectively moves to the movable piston side when the operation lever is rotated, and forcibly moves the movable piston to the retainer member side. It is characterized by having a child.

  As described above, according to the ventilator according to the present invention, in the ventilator that opens or closes the door by applying a solenoid as an actuator, the ventilator includes a door that controls the flow rate of the vent. Since the interlocking means of the door and the movable piston of the solenoid is configured so that each door can be held in the required state in both the open state and the closed state, the number of components is small, The structure can be simplified, and the closed state can be reliably maintained by the door and the contacted surface that contacts the contact surface of the door in the closed state.

  Further, according to the present invention, the stress between the contact surfaces of the door and the fixed side can be reduced, and the size can be reduced. And in such a structure, there exists an advantage that both opening / closing operation | movement can be performed with one door.

  Further, according to the present invention, since the fulcrum (support shaft part) for opening and closing the door is adjacent to the action point for opening or closing the door, the stress applied to the contact surface is small, and the structure The size of the actuator and the size of the actuator can be reduced.

  Further, according to the present invention, in the conventional structure, it is necessary to provide a clearance in order to rotate the mating surface of the door, and as a result, a gap is generated when the door is fully closed, resulting in poor airtightness. However, according to the present invention, there is an advantage that airtightness is high due to surface contact.

  Furthermore, according to the present invention, since the contact surface is different in both opening and closing operations, the load applied to the link mechanism is small, and the durability is excellent. Moreover, even if the actuator advances beyond a predetermined amount, there is an advantage that the open state can be maintained by the straight portion provided on the outer wall of the holder.

  Further, according to the present invention, the door can be forcibly closed by manual operation regardless of the operation of the actuator, and the ventilation port can be reliably closed even if the actuator is damaged. There is an advantage that you can.

  Furthermore, according to the present invention, there is an advantage that a problem such as enlargement, which has been a problem in the past, does not occur.

  In addition, according to the present invention, when a self-holding solenoid is selected as the actuator, for example, no electric power is required to hold the open / closed state at a required position of the door, and the door opening and closing operations are further performed. The operation is simple and reliable, such as maintenance in a state, and there is an advantage that the position detecting means is not necessary and the cost can be reduced.

  Furthermore, according to the present invention, there is an advantage that even a latch-type actuator that strokes in stages can be reliably controlled to the fully open and fully closed positions.

  And according to such a structure, when a ventilation fan such as a range hood is activated, it is possible to open the ventilation opening in conjunction with the room so as not to become negative pressure, and to provide a manual closing means Thus, it is possible to obtain a ventilation device that can be opened and closed manually and can also be used as a ventilation port for indoor ventilation.

  FIG. 1 to FIG. 9 show an embodiment of a ventilator according to the present invention. In this embodiment, a ventilator is provided between a room interior and an exterior of a building for ventilation. The case where it uses as an opening-and-closing blade of what is called a butterfly valve type which opens and closes a ventilation opening with a circular door is shown.

  In these drawings, a ventilating apparatus generally indicated by reference numeral 10 includes a cylindrical member 11 having a flange portion 11 a at one end, and the inside of the cylindrical member 11 forms a ventilation port 12. In this cylindrical member 11, an annular step portion 13 is formed on the inner surface portion on the other end side, and two semi-disc shaped doors 14 for opening and closing the ventilation port 12 are formed on the contact surface 13a on the outdoor side. It is comprised so that the peripheral part of 15 may contact | abut in a surface contact state. The two doors 14 and 15 are disposed so as to cover the ventilation port 12 of the cylindrical member 11, and each of the doors 14 and 15 rotates about an axis extending in a substantially diametrical direction of the cylindrical member 2. It has a butterfly valve type structure for opening and closing the mouth 12.

The cylindrical member 11 is fixed from the outdoor side or the indoor side so as to close the opening formed in the wall part of the building (not shown) (window sash, wall, etc.). The ventilation port 12 is configured to be a passage for selectively communicating and blocking the outdoor side and the indoor side.
Further, the upper and lower portions of the annular step portion 13 of the cylindrical member 11 described above are formed as flat portions, and the corresponding portions of the doors 14 and 15 are also cut out.

  A U-shaped notch is formed at a position corresponding to the central portion of the ventilation opening 12 of the doors 14 and 15, and the doors 14 and 15 are rotated at positions inside thereof and eccentric to the indoor side. Support shaft portions 14a and 15a serving as a moving center are formed.

Now, according to this invention, the door opening / closing mechanism part 20 for performing the opening / closing operation | movement of the doors 14 and 15 centering on the spindle parts 14a and 15a mentioned above is comprised as follows.
That is, as is clear from FIGS. 1, 4 and 5, etc., a main body portion 21 having a substantially rectangular tube shape is disposed in the central portion of the ventilation port 12 of the cylindrical member 11, and the cylindrical member 11 is provided by a stay. Are integrally provided.

  A self-holding electromagnetic solenoid 22 that is a drive source of the ventilating apparatus 10 according to the present invention is incorporated in the main body 21, and a movable piston 23 that is a solenoid iron core is fitted therein. A retainer member 30 is fitted to the end of the movable piston 23 on the outdoor side so as to be movable in the axial direction, and is locked by a locking ring. The retainer member 30 is provided with two pairs of upper and lower support shaft holding portions 30a and 30b having a substantially C-shape projecting left and right, and the support shaft portions of the doors 14 and 15 are provided on the upper and lower support shaft holding portions 30a and 30b. By supporting 14a and 15a, the doors 14 and 15 are supported so that opening and closing is possible.

  In the figure, reference numeral 31 denotes a holder member arranged on the outdoor side of the retainer member 30 so as to hold it, and is configured to be fitted in the notches in the center of the doors 14 and 15. . In addition, the holder member 31 has a locking portion formed on the stay side that holds the main body portion 21 at the tip claw portions of the locking pieces 31a and 31b that protrude from the lower portion toward the indoor side. The rib portion protruding from the tip claw portion at a predetermined interval engages with the locking portion on the stay side, and is fixedly assembled.

  Here, the holder member 31 is fixed in a state in which the stay-side locking portion is sandwiched between the tip claw portion and the rib portion of the locking pieces 31a and 31b. Sometimes the tip claw portion is locked to the stay side locking portion when fully open, so that the holder member 31 resists the movement of the retainer member 30 and the urging force acting on the retainer member 30, and the required It is for maintaining a fixed state.

  In the holder member 31, the retainer member 30 is held in a movable state, is urged to the outdoor side by the urging force of the coil spring 33, and is pressed against the inner side of the holder member 31. Yes. In the drawing, reference numeral 33 a denotes a small-diameter coil spring fitted to the small-diameter portion of the movable piston 23 for holding the retainer member 30 on the movable piston 23.

  On the other hand, at the end of the cylindrical member 11 on the indoor side, as is clear from FIGS. 1, 3, 5, 9, and the like, the small diameter of the movable piston 23 disposed through the solenoid 22. A manual closing mechanism 40 for manually closing the doors 14 and 15 by selectively engaging the tip of the rod portion 23a is provided. The manual closing mechanism 40 includes a cover member 42 disposed at the indoor side end of the main body 21 in the door opening / closing mechanism 20, and around the cover member 42, the indoor side of the cylindrical member 11 is provided. A filter mounting ring frame 41 that is latched and held by an annular step formed at the end is fixed via a central portion 41a.

  In the portion of the manual closing mechanism 40 that is closer to the center of the cover member 42, the operating lever 43 that is manually rotated is positioned away from the axis of the movable piston 23 and is perpendicular to the axis. A pivot is provided at the outer end of the cover member 42 as a support shaft so that it can be rotated. An engaging roller 43a is provided at the rotating end of the operating lever 43, and a slider 44 as a pressing element held in the cover member 42 so as to be movable in the axial direction and a pressing part 45 provided at the center thereof are solenoided. It is configured so that it can be pressed to the 22 side, engaged with the small diameter rod portion 23a of the movable piston 23 and forcibly moved to the retainer member 30 side. Reference numeral 46 denotes a coil spring that urges the slider 44 toward the operation lever 43, and reference numeral 47 denotes a spacer that bears the coil spring receiver 46 and the solenoid 22.

  In the configuration described above, according to the present invention, as shown in FIG. 6 and FIG. 7, the engagement step portion protruding sideways is provided on the proximal end side of the locking pieces 31 a and 31 b of the holder member 31. 35, 35 are provided. And the corner | angular part of the outdoor side of this engagement step part 35 and 35 engages with the side surfaces 36 and 36 of the surface direction of the base end part of the doors 14 and 15 as an action point at the time of opening the doors 14 and 15. The first engaging portions 35a and 35a are provided. In addition, when the doors 14 and 15 are in a closed state, notches 35b and 35b facing the base end portions of the doors 14 and 15 between the engagement step portions 35 and 35 and the main body portion of the holder member 31. Is formed. Further, the side portions of the engaging step portions 35 and 35 are formed as straight portions 35c and 35c that come into contact with the base end side surfaces 36 and 36 when the doors 14 and 15 are open.

  Furthermore, according to the present invention, as shown in FIGS. 6 and 8, the engaging projections 37, 37 projecting in the axial direction are provided on the inner surface of the holder member 31. The engaging corners 38 and 38 of the base end portions of the doors 14 and 15 are engaged with the corners at the distal ends of the engaging convex portions 37 and 37 as engagement points when the doors 14 and 15 are closed. 2 engaging portions 37a, 37a. The outer side surfaces of the engaging projections 37 and 37 are formed as straight portions 37b and 37b that contact the base end engaging surfaces 38 and 38 when the doors 14 and 15 are closed.

According to the ventilator 10 having the above configuration, the doors 14 and 15 are opened and closed as follows.
That is, when the doors 14 and 15 as shown in FIG. 1 are in the closed state, a current is applied to the electromagnetic solenoid 22 and moved to the right side in the figure. Then, as shown in FIGS. 6 (a) to 6 (g) and FIG. 7 , the doors 14 and 15 in which the door support shafts 14a and 15a are supported by the support shaft holding portions 30a and 30b of the retainer member 30 . The base end side surface 36 engages with the first engagement portion 35a of the engagement step portion 35 of the holder member 31, and rotates as shown in FIGS. 6 (d) and 6 (e). Then, the open state as shown in FIG. Further, even if the movable piston 23 moves , and the retainer member 30 moves away from the holder member 31, the side surface 36 is in sliding contact with the straight portion 35c, so that the open state is maintained. It will be. According to said straight part 35c, the case where the stroke of movable piston 23 which is an iron core is insufficient can be absorbed.

Even if the solenoid 22 is deenergized in the open state, the open state is maintained, and the closed state is maintained even in the closed state.
When the doors 14 and 15 are in the closed state, the base end portion is located on the main body portion side of the holder member 31 in the notch 35b, and the side surface 36 is in a non-contact state with the first engagement portion 35a. It is in. That is, as the retainer member 30 moves in accordance with the movement of the movable piston 23, the states (a), (b) to (c) of FIG.

  Further, in such an operation in the opening direction of the door, as is apparent from FIGS. 6A to 6G, the engagement surface 38 in the thickness direction of the base end portion of the doors 14 and 15 is engaged. The convex portion 37 is in a non-contact state except for the fully closed state and the fully open state.

On the other hand, when the doors 14 and 15 are in the open state, a current is applied to the electromagnetic solenoid 22 and moved to the left in the figure. Then, contrary to the opening operation described above with reference to FIG. 6, the state moves from (g) to (a). That is, as shown in FIGS. 6G to 6A and FIG. 8 , the doors 14 and 15 in which the door support shaft portions 14a and 15a are supported by the support shaft holding portions 30a and 30b of the retainer member 30. The engagement surface 38 in the thickness direction of the base end portion of the engagement member engages with the second engagement portion 37a of the engagement convex portion 37 of the holder member 31, and this is used as an action point in FIGS. ) And the closed state as shown in FIG. Furthermore, even if the movable piston 23 is moved and the retainer member 30 is moved in a direction approaching the holder member 31, the engagement surface 38 is in sliding contact with the straight portion 37b. Will be maintained. According to said straight part 37c, it can absorb that the stroke of movable piston 23 which is an iron core exceeds.

Even if the solenoid 22 is deenergized in the open state, the open state is maintained, and the closed state is maintained even in the closed state.
Further, in such an operation in the closing direction of the door, as is apparent from FIGS. 6G to 6A, the side surface 36 of the base end portion of the doors 14 and 15 is different from the engagement step portion 35. When reaching from the fully closed state to the fully open state, it is in a non-contact state.
Further, the straight portions 35c and 37c in the respective engaging portions 35 and 37 can absorb the backlash at the time of assembling the component alone and the assembly.

The manual closing mechanism 40 operates as follows.
That is, as shown in FIG. 9A, the operation lever 43 is normally urged in a direction in which the slider 44 as a pressing element is separated from the movable piston 23 within the cover member 42 by the urging force of the coil spring 46. Along with this, the state is maintained in a state where a clockwise turning behavior is given in the drawing.

  In this state, when the doors 14 and 15 are to be forcibly closed, the operation lever 43 is turned counterclockwise in the drawing to obtain the state shown in FIG. 9B. Then, the engaging roller 43a at the tip of the operation lever 43 moves the slider 44 to the movable piston 23 side, and engages and presses the tip of the small-diameter rod portion 23a of the movable piston 23 by the pressing portion 45. It can be done.

  In this way, the movable piston 23 is forcibly moved to the holder member 31 side (left side in the figure) regardless of the open state of the doors 14 and 15. The doors 14 and 15 described in g) to (a) are closed, and the closed state shown in FIG. 1 is obtained. Therefore, according to such a configuration, the doors 14 and 15 can be forcibly closed regardless of the application to the electromagnetic solenoid 22.

  Here, as shown in FIG. 9B, the operation lever 43 is so-called dead because the center of the engaging roller 43a is located below the horizontal line segment from the support shaft portion in the figure. The state is over the point, the state is maintained by the urging force of the coil spring 46, and the doors 14 and 15 can be kept closed.

  According to the manual closing mechanism 40 having such a configuration, the operation lever 43 can be easily and reliably operated, and the urging force of the coil spring 46 and the like may be small, so that the operability is improved. It becomes. Further, since the operation lever 43 can be fixed with a simple structure with a small number of parts, the size can be reduced and the advantage is great.

  In such a manual closing mechanism 40, the doors 14 and 15 can be manually closed regardless of the operation of the solenoid 22, and the operation portion is on the indoor side, so that the operation is easy. There are also advantages such as.

In addition, this invention is not limited to the structure demonstrated by embodiment mentioned above, It cannot be overemphasized that the shape of each part which comprises the ventilation apparatus 10, a structure, etc. can be deform | transformed and changed suitably.
For example, in the above-described embodiment, the case where the electromagnetic solenoid 22 as the actuator is a self-holding type has been described, but it is needless to say that the present invention is not limited to this.

  Moreover, in embodiment mentioned above, although demonstrated as the ventilator 10 for house facilities applied to the indoor ventilation opening of a general building, this invention is not limited to this, For opening and closing of the door in various fields | areas Needless to say, the present invention is applicable to a ventilator that opens and closes a ventilation opening having a living room such as a camper.

It is principal part sectional drawing which shows one Embodiment of the ventilation apparatus which concerns on this invention. The external appearance of the ventilation apparatus which concerns on this invention is shown, (a) is the schematic perspective view seen from the outdoor side, (b) is the schematic perspective view seen from the indoor side. It is for demonstrating the outline | summary of the opening / closing mechanism part of the door characterized by the ventilation apparatus which concerns on this invention, (a) is a schematic perspective view in the state which the door closed, (b) is a door of one side. It is a schematic perspective view in the removed state. It is a general | schematic disassembled perspective view which decomposes | disassembles and shows the principal part seen from the outdoor side in the ventilation apparatus which concerns on this invention. It is a general | schematic disassembled perspective view which decomposes | disassembles and shows the principal part seen from the room inner side in the ventilation apparatus which concerns on this invention. (A)-(g) is an operation | movement explanatory drawing at the time of making a door open or close in the ventilation apparatus which concerns on this invention. It is principal part sectional drawing for demonstrating the 1st contact end used as an action point at the time of the door opening operation | movement by (a)-(g) of FIG. It is principal part sectional drawing for demonstrating the 2nd contact end used as an action point at the time of the closing operation of the door by (g)-(a) of FIG. (A), (b) is operation | movement explanatory drawing of the manual closing mechanism part which forcibly closes a door manually in the ventilation apparatus which concerns on this invention. (A), (b) is a schematic sectional drawing for demonstrating the schematic structure of the conventionally well-known ventilation apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Ventilator, 11 ... Cylindrical member, 11a ... Flange part, 12 ... Ventilation port, 13 ... Annular step, 13a ... Contact surface, 14, 15 ... Semi-disc door, 14a, 15a ... Support shaft , 20 ... Door opening / closing mechanism part, 21 ... Main body part, 22 ... Self-holding electromagnetic solenoid, 23 ... Movable piston, 23a ... Small diameter rod part, 30 ... Retainer member, 30a, 30b ... Supporting shaft holding part, 31 ... Holder member, 31a, 31b ... locking piece, 33 ... coil spring, 33a ... small diameter coil spring, 35, 35 ... engagement step, 35a, 35a ... first engagement part, 35b, 35b ... notch, 35c , 35c ... straight part, 36, 36 ... side face in the door base end face direction, 37, 37 ... engagement convex part, 37a, 37a ... second engagement part, 37b, 37b ... straight part, 40 ... manual closing Mechanism part (manual closing means), 41 ... filter With ring frame, 41a ... rectangular opening, 42 ... cover member, 43 ... operating lever, 43a ... engagement roller, 44 ... slider (pressure members) 45 ... pressing portion, 46 ... coil spring, 47 ... spacer.

Claims (6)

A door that is pivotally supported to open and close the ventilation opening;
An actuator having a movable piston that is moved back and forth to open and close the door;
A retainer member that includes a support shaft holding portion that rotatably supports the support shaft portion of the door, and that moves forward and backward in a direction perpendicular to the support shaft portion according to the movement of the movable piston when the actuator is operated; ,
A holder member that holds the retainer member in a state in which the retainer member can move forward and backward,
An engagement step portion is provided that protrudes from the holder member toward the retainer member and that engages with the movable piston side surface of the base end portion of the door through a notch that faces the base end portion of the door in a closed state. The corner portion of the engagement step portion is a first engagement portion that engages with the side surface of the base end portion as an action point when the door is opened ,
An engaging convex portion that protrudes from the holder member toward the retainer member and faces the engaging surface in the thickness direction of the base end portion of the door is provided, and the door closes the corner portion of the engaging convex portion. Sometimes as a second engagement portion that engages with the base end engagement surface as an action point ,
When the door is opened, the retainer member is moved away from the holder member according to the movement of the movable piston. When the door is closed, the retainer member is moved according to the movement of the movable piston. A ventilator configured to move in a direction approaching a member . The ventilator according to claim 1,
During the opening operation of the door in which the first engagement portion is engaged with the base end side surface of the door, the second engagement portion maintains a non-engagement state with the base end side of the door, and the second The first engaging portion is configured to maintain a non-engaged state with the base end side of the door during the closing operation of the door in which the engaging portion is engaged with the base end engaging surface of the door. A ventilator characterized by being. The ventilator according to claim 1 or 2,
The ventilator characterized in that the support shaft portion of the door is provided at an eccentric position in the thickness direction of the door. The ventilator according to claim 1, 2 or 3,
The ventilator characterized in that the engaging step portion and the engaging convex portion of the holder member are formed with their positions shifted in the axial direction of the support shaft portion of the door. The ventilator according to any one of claims 1 to 4,
A ventilator characterized in that manual closing means for forcibly moving the movable piston forward and backward by manual operation is provided at the end of the actuator opposite to the retainer member of the movable piston. The ventilator according to claim 5, wherein
The manual closing means is an operation lever provided at a position deviated from the axis of the movable piston and orthogonal to the direction perpendicular to the axis so as to be rotatable, and by rotating the operation lever. A ventilator comprising a pressing element that selectively moves to the movable piston side and forcibly moves the movable piston to the retainer member side.

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