JP5417135B2 - Electric vacuum cleaner - Google Patents

Description

  The present invention provides an electric cleaning device including a leak valve that suppresses an overheating of an electric blower by introducing outside air into the load side of the electric blower when the negative pressure on the load (upstream) side of the electric blower increases excessively. Related to the machine.

  A vacuum cleaner in which a leak mechanism including a cylinder body, a leak valve body, and a coil spring is located on the load side of the electric blower and is attached to the cleaner body is known as a prior art (for example, a patent) Reference 1).

  The cylinder body of the leak mechanism has a substantially cylindrical shape, and has a regulation wall portion with a flow hole opened at one end portion thereof, and the other end portion of the cylinder body communicates with the load side of the electric blower. A leak valve body is slidably disposed along the axial direction of the cylinder body in a valve body chamber defined in the cylinder body by the restriction wall. The leak valve body has a substantially columnar shape, and has a flange-shaped flange portion that is movable to the inner peripheral surface of the valve body chamber and that is in contact with the valve body at one end thereof. Further, a coil spring for energizing the leak valve body is accommodated in the valve body chamber, and the end surface of the leak valve body on which the flange portion is not provided is brought into contact with the restriction wall portion by this spring, and the flow hole Is blocked.

  With this leak mechanism, atmospheric pressure acts on the end face of the leak valve body that is in contact with the regulating wall, and the load-side pressure (negative pressure) of the electric blower is applied to the end face of the leak valve body in contact with the coil spring. ) Acts. When the negative pressure on the load side increases and the difference between the negative pressure and the atmospheric pressure increases, the leak valve is moved away from the regulating wall against the bias of the coil spring, and the flow hole is opened. , The outside air leaks. That is, outside air is introduced to the load side of the electric blower through the leak valve mechanism. Thereby, since the air volume which distribute | circulates an electric blower is ensured, an electric blower is cooled and the temperature rise of this electric blower is suppressed.

Japanese Patent Laid-Open No. 11-9526 (paragraphs 0020-0016, 0029-0032, FIGS. 1 to 3)

  The behavior when the leak valve body opens the flow hole and the outside air is introduced depends on the magnitude of the static pressure (the pressure difference) until the opening of the flow hole. Moving while shrinking depends on the kinetic energy of the airflow that flows through the cylinder and is introduced to the load side of the electric blower, that is, the dynamic pressure.

  In the conventional leak mechanism, the dynamic pressure is received by the end face of the leak valve body and the flange-shaped flange that are in contact with the restriction wall. However, since the diameter of the collar is regulated by the inner diameter of the cylinder, and the diameter of the end face of the leak valve body is smaller than the collar, it is difficult to ensure a sufficiently large area for receiving the dynamic pressure. Furthermore, since the peripheral edge of the flange portion of the leak valve body is circular, and this flange portion is in a size that is substantially in airtight contact with the inner peripheral surface of the cylindrical body (valve body chamber), this flange portion circulates through the cylindrical body. It tends to be a resistance to the flow of introduced air. Therefore, the dynamic pressure does not sufficiently act on the leak valve body, and the leak operation (outside air introduction operation) in the leak mechanism may not be started smoothly. In addition, since the flange portion of the leak valve body is thin, when the leak valve body is tilted when the leak valve body moves along the axial direction in the cylinder body, the valve body may be inclined along the inner peripheral surface of the cylinder body. The part is easily caught. Therefore, also in this respect, the leak operation by the leak mechanism may not be performed stably and smoothly.

  As described above, the conventional technique has a problem that when the negative pressure on the load side of the electric blower increases excessively, the leak operation of the leak valve may not be started smoothly.

  The present invention includes a cylinder having a valve seat portion surrounding a leak port at one end and a vent port communicating with the load side of the electric blower at the other end, and a leak port opening / closing member movably accommodated in the cylinder And the leak valve which comprises the coil spring which is accommodated in the cylinder and presses the leak port opening / closing member against the valve seat portion is assumed to be a vacuum cleaner attached to the vacuum cleaner body.

In order to solve the above-described problems, the present invention provides a leak port opening / closing member that is integrated with a piston having one end closed by a closed end wall and the other end opened , and in contact with the tip of the annular protrusion. And a plurality of ribs that extend in the axial direction of the cylinder and are guided by the inner surface of the cylinder, and openings between the ribs. The pressure receiving member is disposed so as to be moved toward and away from the valve seat portion. A communication part is provided to communicate with each other, an annular convex part is projected from the periphery of the closed end wall toward the valve seat part, and a through hole that is smaller than the annular convex part and faces the closed end wall is provided in the pressure receiving member. It is characterized by that.

  According to the present invention, when the negative pressure on the load side of the electric blower is excessively increased and the leak valve is opened, the dynamic pressure is applied to the pressure receiving member facing the leak port and the closed end wall of the piston covered with the member. Therefore, there is an effect that the leak operation of the leak valve can be started smoothly.

It is a side view which shows the vacuum cleaner main body of the vacuum cleaner which concerns on 1st Embodiment of this invention, and shows a partial cross section. It is sectional drawing which shows the leak valve attached to the cleaner body of FIG. It is a perspective view shown in the state which isolate | separated some pistons and pressure receiving members with which the leak valve of FIG. 2 is provided. It is sectional drawing which follows the F4-F4 line | wire in FIG. It is sectional drawing equivalent to the said FIG. 4 which shows the leak valve attached to the cleaner body of the vacuum cleaner which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows the leak valve attached to the cleaner body of the vacuum cleaner which concerns on 3rd Embodiment of this invention. It is sectional drawing equivalent to the said FIG. 4 which shows the leak valve attached to the cleaner body of the vacuum cleaner which concerns on 3rd Embodiment.

  Hereinafter, the first embodiment of the present invention will be described in detail with reference to FIGS.

  Reference numeral 1 in FIG. 1 indicates, for example, a main body of a canister type vacuum cleaner. The vacuum cleaner main body 1 is formed by connecting a lower main body case 1a having a front upper surface opened and an upper main body case 1b having a rear upper surface closed. A rear end portion of a lid body 2 that opens and closes a front opening of the cleaner body 1 from above is rotatably attached to the upper body case 1 b of the cleaner body 1. In FIG. 1, reference numeral 3 denotes a turning theory, and reference numeral 4 denotes a wheel. With the turning theory 3 and the wheels 4, the cleaner body 1 can move on the surface to be cleaned.

  A partition wall 5 having a lattice-shaped hole 5a is provided in the cleaner body 1. The partition body 5 divides the interior of the cleaner body 1 into a dust collection chamber 6 on the front side of the partition wall 5 and a blower storage chamber 7 on the rear side of the partition wall 5. A cylindrical suction port 8 is provided at the center of the front wall of the cleaner body 1. A dust suction hose (not shown) is detachably connected to the suction port 8. A suction port (not shown) for floor cleaning or the like is connected to the tip of the dust suction hose via an extension tube (not shown), and dust-containing air is collected in the dust collection chamber via these suction port, extension tube, and dust suction hose. 6 is sucked into.

  The dust collection chamber 6 is opened upward, and this opening is opened and closed by the lid 2. In the dust collection chamber 6, dust collection means, for example, a dust collection bag 9 is detachably accommodated through the upper opening. In addition, the code | symbol 10 in FIG. 1 has shown the holder pivotally attached to the front-end part in the dust collection chamber 6, and hold | maintained in the accommodation state of the dust bag 9. FIG. The inlet of the dust bag 9 accommodated in the dust chamber 6 is communicated with the suction port 8 from the rear side.

  An auxiliary dust collection filter 11 that covers the hole 5a of the partition wall 5 from the front side is detachably mounted on the front surface of the partition wall 5. The auxiliary dust collection filter 11 has a frame body 12 and an auxiliary filter 13 supported by the frame body 12. The frame 12 supports the rear surface of the dust bag 9.

  The blower storage chamber 7 contains an electric blower 15, a cord reel (not shown), a control device, and the like. A front end portion of the electric blower 15 is supported by a support wall 1c provided in the cleaner body 1 with a gap G formed on the rear side of the partition wall 5 via an annular vibration-proof rubber 16. The end portion is also supported by another support wall (not shown) provided at the rear portion in the cleaner body 1 via a vibration isolating rubber. The air inlet 15a of the electric blower 15 is opened toward the gap G and faces the partition wall 5 from the rear side. Therefore, the dust collection chamber 6 and the gap G are provided on the load (upstream) side where the suction negative pressure of the electric blower 15 acts.

  When the electric blower 15 is operated, air sucked from the intake port 15a is circulated therein, so that the electric blower 15 is cooled by air. At the same time, the air discharged from the electric blower 15 is discharged out of the cleaner body 1 through an exhaust portion (not shown) provided at, for example, the rear end of the cleaner body 1.

  A leak valve mounting portion 18 is provided at, for example, the upper portion of the cleaner body 1. When the negative pressure in the dust collection chamber 6 and the gap G on the load side of the electric blower 15 increases excessively in the leak valve mounting portion 18, the outside air is opened to the gap G on the load side of the electric blower 15. A leak valve 21 to be introduced is mounted.

  As shown in FIG. 2, the leak valve 21 includes a cylinder 22 attached to the leak valve attachment portion 18, a leak port opening / closing member 31, and a coil spring 45.

  The cylinder 22 includes a cylinder body 23 and a cap 24.

  The cylinder body 23 made of metal or synthetic resin has a cylindrical shape, and one end thereof in the axial direction is opened. A vent hole 25 is provided at the other axial end of the cylinder body 23, leaving a slight body end wall 23a.

  A cap 24 made of metal or synthetic resin is screwed or fitted to the outer periphery of one end of the cylinder body 23. The cap 24 has a valve seat portion 24a that has entered into one end opening of the cylinder body 23, and a leak port 26 that is surrounded by the valve seat portion 24a. Therefore, the leak port 26 is provided at one end of the cylinder body 23 in the axial direction so as to communicate the inside and outside of the cylinder body 23. The leak port 26 is composed of a tapered hole.

  The cylinder 22 is attached to the cleaner body 1 with the leak port 26 communicating with the external space of the cleaner body 1. In the present embodiment, the cylinder 22 is erected so that the leak port 26 is positioned at the upper end, and the cylinder 22 is attached to the leak valve attachment portion 18. The leak port 26 faces the outside of the cleaner body 1. With this attachment, the vent hole 25 is positioned at the lower end of the cylinder 22. The vent 25 communicates with the gap G. In other words, the vent 25 communicates with the load side of the electric blower 15.

  The leak opening / closing member 31 is accommodated in the cylinder 22 so as to be movable in the axial direction thereof. The leak port opening / closing member 31 includes a piston 32 and a pressure receiving member 41.

  The piston 32 made of metal or synthetic resin has a substantially cylindrical shape with only one end opened, and as shown in FIGS. 2 and 3, the closed end wall 33, the opening 34, the annular convex portion 35, and the communication portion. 36, a spring receiving portion 37, and a plurality of ribs 38.

  The closed end wall 33 is provided by closing one end of the piston 32 in the axial direction, and the opening 34 is formed at the other end of the piston 32 in the axial direction.

  The annular convex portion 35 protrudes integrally with the peripheral portion of the closed end wall 33. The annular protrusion 35 is continuously formed in the circumferential direction of the piston 32 without a break. At the same time, the annular convex portion 35 is provided so as to protrude toward the valve seat portion 24 a in a state where the piston 32 is incorporated in the cylinder 22. The annular convex portion 35 and the closed end wall 33 form a shallow dish-shaped recess at one end portion in the axial direction of the piston 32. The inner diameter of the annular convex portion 35 is substantially the same as that of the leak port 26 and larger than the diameter of a through hole 42 described later.

  As shown in FIG. 2, for example, a pair of communicating portions 36 are provided so as to surround the peripheral wall of the piston 32, and the inside and outside of the piston 32 are communicated. Therefore, the vent hole 25 of the piston 32 communicates with the outside of the peripheral wall of the piston 32 through the communication portion 36.

  The end on the vent 25 side of the peripheral wall of the piston 32 with the communication portion 36 as a boundary has a step on the outer periphery and is used as a spring receiving portion 37. The spring receiving portion 37 surrounds the vent hole 25.

  The number of ribs 38 is preferably 3 or more. In the present embodiment, the number of ribs 38 is, for example, 4. These ribs 38 are integrally projected on the outer surface of the portion on the closed end wall 33 side with the communication portion 36 as a boundary in the peripheral wall of the piston 32, and extend in the axial direction of the piston 32. Each rib 38 is equally distributed in the circumferential direction of the piston 32, and is provided, for example, every 90 degrees. The ends of the ribs 38 far from the communication portion 36 are set back from the tip of the annular convex portion 35 toward the vent 25 (lower side in FIG. 2). The protruding width of each rib 38 with respect to the peripheral wall is determined so that the diameter of an imaginary circle drawn through the tips of the ribs 38 is substantially equal to the inner diameter of the cylinder 22, more precisely the inner diameter of the cylinder body 23.

  The piston 32 configured as described above is accommodated in the cylinder 22 with the closed end wall 33 and the annular convex portion 35 disposed on the valve seat portion 24a side and the spring receiving portion 31 disposed on the vent hole 25 side. Each rib 38 of the accommodated piston 32 extends in the axial direction of the cylinder 22 and is guided by the inner surface of the cylinder body 23 of the cylinder 22 so that the piston 32 can move in the axial direction of the cylinder 22. A space surrounded by the adjacent ribs 38 and the inner surface of the cylinder 22 is communicated with the opening 34 of the piston 32 via the communication portion 36.

  As shown in FIG. 3, the pressure receiving member 41 has a circular outer shape and has a through hole 42 in the center. The pressure receiving member 41 can be made of synthetic resin, but is preferably made of metal. Thereby, the pressure receiving member 41 can be made from a metal flat plate with a simple punching die, and the deburring after punching is simple, so that the catching with the inner surface of the cylinder 22 caused by the peripheral edge of the pressure receiving member 41 is suppressed. As the pressure receiving member 41 moves smoothly, the operation of the leak valve 21 can be stabilized.

  The outer diameter of the pressure receiving member 41 is smaller than the diameter of a virtual circle drawn through the tip of each rib 38. In this case, even when the pressure receiving member 41 moves to the maximum in the direction orthogonal to the axial direction of the piston 32 (in other words, the radial direction of the cylinder 22), the outer peripheral edge of the pressure receiving member 41 is the leak port. The outer diameter of the pressure receiving member 41 is determined so that the pressure receiving member 41 does not face the inner surface of the annular convex portion 35. The through hole 42 has a smaller diameter than the annular convex portion 35 and the leak port 26.

  The pressure receiving member 41 is disposed in the cylinder 22 so as to be moved integrally with the piston 32 so as to contact and separate from the valve seat portion 24a. Specifically, in the case of this embodiment, the pressure receiving member 41 is disposed on the annular convex portion 35 so as to be movable with respect to the piston 32 without being fixed to the tip of the annular convex portion 35. Yes. Therefore, as shown in FIG. 1, when the pressure receiving member 41 is built in the cylinder 22 together with the piston 32, the pressure receiving member 41 is disposed between the annular convex portion 35 of the piston 32 and the valve seat portion 24 a of the cylinder 22. ing. The pressure receiving member 41 covers the closed end wall 33 of the piston 32.

  As shown in FIG. 1, the coil spring 45 is compressed in the cylinder 22 with one end engaged with the spring receiving portion 37 of the piston 32 and the other end supported on the main body end wall 23 a of the cylinder 22. Is housed in. The leak opening / closing member 31 is pressed against the valve seat 24 a by the elastic force of the coil spring 45. That is, the piston 32 of the leak port opening / closing member 31 is pushed by the coil spring 45, and the pressure receiving member 41 of the leak port opening / closing member 31 is sandwiched between the piston 32 and the valve seat portion 24a.

  In this state, the through hole 42 of the pressure receiving member 41 faces the leak port 26 and the closed end wall 33. Therefore, the leak port 26 and the closed end wall 33 face each other through the through hole 42. At the same time, the portions around the through hole 42 of the pressure receiving member 41 face the leak port 26 and the closed end wall 33, respectively.

  When dust sucked into the suction path is caught during use of the vacuum cleaner, or when the suction mouth is strongly attracted to the surface to be cleaned, or the amount of dust trapped in the dust bag 9 increases and the dust bag For example, when the air permeability of 9 decreases, the negative pressure on the load side of the electric blower 15 increases to a predetermined value or more.

  Along with this, the negative pressure in the cylinder main body 23 of the leak valve 21 communicating with the gap G also increases. When the static pressure difference between this negative pressure and the pressure outside the cleaner main body 1 exceeds a predetermined value, the coil The leak port opening / closing member 31 is momentarily pulled against the spring force of the spring 45 to open the leak port 26. Subsequently, due to the dynamic pressure of the outside air introduced into the cylinder 22 from the leak port 26, the leak port opening / closing member 31 is pushed and moved while bending the coil spring 45, and the leak port 26 is sufficiently opened. Therefore, the air outside the cleaner body 1 flows into the cleaner body 1 through the leak valve 21 and further sucked into the electric blower 15 through the gap G, so that the amount of air flowing through the electric blower 15 is secured. Thus, the electric blower 15 can be prevented from being overheated.

  In such a leak operation involving the opening of the leak valve 21, the dynamic pressure acts on the leak port opening / closing member 31 immediately after the leak port 26 is opened due to the static pressure difference, that is, sucked into the cylinder 22 through the leak port 26. The action of the kinetic energy of the airflow will be described.

  When the leak port 26 is opened even by a small amount due to the static pressure difference, an air flow is formed in which outside air passing through the leak port 26 is sucked into the cylinder 22. The suction airflow blows to a portion of the pressure receiving member 41 of the leak port opening / closing member 31 facing the leak port 26, and the space between the peripheral portion of the pressure receiving member 41 and the valve seat portion 24 a of the cylinder 22. Then, it flows between the ribs 38 of the piston 32 from around the pressure receiving member 41. In this case, since the pressure receiving member 41 has a smaller diameter than the inner diameter of the cylinder 22, the pressure receiving member 41 is prevented from blocking the flow of the suction air flow, and a smooth air flow between the ribs 38 can be ensured. Furthermore, after the airflow flows into the piston 32 from between the ribs 38 through the communication portion 36, the airflow is sucked into the electric blower 15 through the air gap 25 of the piston 32 through the gap G in the cleaner body 1.

  Since the pressure receiving member 41 of the leak opening / closing member 31 receives the kinetic energy of the suction air flow as described above, the leak opening / closing member 31 is pushed in a direction away from the leak port 26 by the dynamic pressure of the suction air flow. It is.

  Furthermore, at the moment when the suction air flow is formed with the above-described static pressure difference, a part of this air flow also acts on the closed end wall 33 of the piston 32 of the leak opening / closing member 31 through the through hole 42 of the pressure receiving member 41. To do. As a result, the piston 32 is pushed in a direction away from the leak port 26. In this case, if the airflow acting on the closed end wall 33 does not get over the annular convex portion 35 provided on the closed end wall 33, the airflow does not flow between the piston 32 and the pressure receiving member 41. The dynamic pressure is easy to act on.

  As described above, the dynamic pressure acts on the closed end wall 33 of the piston 32 in addition to the dynamic pressure acting on the pressure receiving member 41 at the moment when the leak port 26 is opened. As described above, since the dynamic pressure is received so as to overlap at two locations in the axial direction of the leak valve 21, a large area can be ensured without being restricted by the inner diameter of the cylinder 22.

  Therefore, the leak port opening / closing member 31 is given a chance to push it, and the leak port opening / closing member 31 can be moved reliably and smoothly in the direction away from the leak port 26 to start the leak operation. Accordingly, outside air can be introduced to the load side of the electric blower 15.

  In the behavior that gives the trigger, the annular convex portion 35 of the piston 32 and the pressure receiving member 41 may be instantaneously separated by the dynamic pressure applied to the closed end wall 33 of the piston 32. In this case, since the area where the pressure receiving member 41 receives the dynamic pressure after the leak port 26 is opened is larger than the area of the closed end wall 33, the pressure receiving member 41 instantaneously separated from the annular convex portion 35 is Immediately thereafter, the pressure receiving member 41 is again brought into contact with the annular convex portion 35 and is moved together with the piston 32 by dynamic pressure.

  Further, the piston 32 moved by the dynamic pressure as described above has the ribs 38 extending in the axial direction and the axial direction of the cylinder 22 guided by the inner surface of the cylinder 22. It is difficult to tilt. Accordingly, the pressure receiving member 41 moved integrally with the piston 32 is also difficult to tilt, and the pressure receiving member 41 is considerably smaller in diameter than the inner diameter of the cylinder 22. Therefore, the piston 32 and the pressure receiving member 41 of the leak port opening / closing member 31 are not caught on the inner surface of the cylinder 22. Therefore, also in this respect, the above-described leak operation (outside air introduction operation) can be smoothly started by the leak valve 21.

  Further, as the pressure on the load side of the electric blower 15 is restored to an appropriate value due to the leak operation described above, the force for moving the leak port opening / closing member 31 decreases, and the spring force of the coil spring 45 is reduced by that force. In the winning state, the piston 32 and the pressure receiving member 41 of the leak opening / closing member 31 are integrally pushed back by the coil spring 45, and the pressure receiving member 41 contacts the valve seat portion 24a. That is, the leak port 26 is closed and the leak operation is finished.

  FIG. 5 shows a second embodiment of the present invention. In the following description of the second embodiment, configurations that are the same as or similar to those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, description thereof is omitted, and only different items are described.

  In the second embodiment, the diameter D of the pressure receiving member 41 of the leak opening / closing member 31 is substantially equal to the inner diameter of the cylinder 22. The pressure receiving member 41 is guided by the inner surface of the cylinder 22 and is movable in the axial direction of the cylinder 22. The peripheral portion of the surface pressure receiving member 41 is a portion that is removed from the leak port 26 (see FIG. 2), and a plurality of ventilation grooves 43 are provided in the peripheral portion. These ventilation grooves 43 are provided at regular intervals along the circumferential direction of the pressure receiving member 41 and open to the outer peripheral edge of the pressure receiving member 41, and after the leak port 26 (see FIG. 2) is opened, The outside air introduced from the leak port 26 is provided as means for passing through the peripheral portion of the pressure receiving member 41.

  Further, the pressure receiving member 41 is in contact with the tip of the annular convex portion 35 without being fixed as in the first embodiment, and a slight gap between the inner surface of the cylinder 22 and the peripheral edge of the pressure receiving member 41, and the cylinder The pressure receiving member 41 and the piston 32 are relatively movable in the radial direction of the cylinder 22 in accordance with a slight gap between the inner surface of the 22 and the rib 38. Configurations and operations other than those described above are the same as those in the first embodiment.

  Therefore, also in the second embodiment, the problem of the present invention can be solved for the same reason as described in the first embodiment, and the negative pressure on the load side of the electric blower 15 (see FIG. 1) is excessively increased. When the leak valve 21 is opened, dynamic pressure is received by the pressure receiving member 41 facing the leak port 26 (see FIG. 2) and the closed end wall 33 (see FIG. 2) of the piston 32 covered with this member. Therefore, the vacuum cleaner provided with the leak valve 21 in which the leak operation starts smoothly can be provided.

  6 and 7 show a third embodiment of the present invention. In the following description of the third embodiment, configurations that are the same as or similar to those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, description thereof is omitted, and only different items are described.

  In 3rd Embodiment, the annular convex part 35 which the piston 32 of the leak opening-and-closing member 31 has is divided | segmented and formed by the some communication groove 35a. These communication grooves 35 a are provided so as to communicate between the inside and the outside of the annular projection 35, and therefore, the inside surrounded by the annular projection 35 and the rib 38 of the piston 32 communicate with each other. Furthermore, in the third embodiment, the pressure receiving member 41 is fixed to the tip of the annular convex portion 35 by bonding using an adhesive (not shown). The pressure receiving member 41 may be the pressure receiving member described in the second embodiment.

  Thus, the leak port opening / closing member 31 connected so that the piston 32 and the pressure receiving member 41 are integrated is sucked from the leak port 26 by the pressure receiving member 41 and leaks from the moment when the leak valve 21 is opened. While being able to receive the dynamic pressure of the airflow that is about to pass through the valve 21, the dynamic pressure of the airflow that flows out between the ribs 38 through the inside of the annular protrusion 35 and the communication groove 35 a through the through hole 42 is converted into the piston 32. The closed end wall 33 can be received. Configurations and operations other than those described above are the same as those in the first embodiment.

  Therefore, also in the third embodiment, the problem of the present invention can be solved for the same reason as described in the first embodiment, and the negative pressure on the load side of the electric blower 15 (see FIG. 1) is excessively increased. When the leak valve 21 is opened, dynamic pressure is received by the pressure receiving member 41 facing the leak port 26 (see FIG. 2) and the closed end wall 33 (see FIG. 2) of the piston 32 covered with this member. Therefore, the vacuum cleaner provided with the leak valve 21 in which the leak operation starts smoothly can be provided.

  In each of the above embodiments, the leak valve is disposed in the vacuum cleaner body in a vertically placed state, but the leak valve can be disposed in a horizontally placed state or an obliquely placed state, and the electric blower is a blower case. In the case where it is covered, it is also possible to place a leak valve in a case part communicating with the intake port of the electric blower in this case, that is, a load side part of the electric blower. Furthermore, the vent of the leak valve does not necessarily face the outside of the cleaner body, and the leak valve may be attached to the cleaner body by connecting the leak valve vent to the part facing the outside of the cleaner body. it can. The present invention is also applicable to vacuum cleaners other than the canister type, such as handy, upright, and stick type vacuum cleaners.

  DESCRIPTION OF SYMBOLS 1 ... Vacuum cleaner main body, 15 ... Electric blower, G ... Air gap of load side of electric blower, 18 ... Leak valve attachment part, 21 ... Leak valve, 22 ... Cylinder, 24a ... Valve seat part, 25 ... Vent, 26 ... Leak port, 31 ... Leak port opening / closing member, 32 ... Piston of leak port opening / closing member, 33 ... Closed end wall, 34 ... Opening, 35 ... Ring-shaped convex portion, 35a ... Communication groove, 36 ... Communication portion, 38 ... Rib, 41 ... Pressure receiving member for leak opening / closing member, 42 ... Through hole, 43 ... Ventilation groove, 45 ... Coil spring

Claims (4)

Connected to the load side of the electric blower built in the main body of the vacuum cleaner and attached to the main body of the vacuum cleaner, and has a valve seat part surrounding the leak port at one end and a vent hole communicating with the load side at the other end. And a leak opening / closing member movably accommodated in the cylinder, and a coil spring accommodated in the cylinder and pressing the leak opening / closing member against the valve seat portion, In the vacuum cleaner provided with a leak valve that is opened when the negative pressure of the air pressure increases excessively and introduces outside air to the load side of the electric blower,
The leak opening and closing member is
One end is closed by a closed end wall and the other end is opened, and a plurality of ribs extending in the axial direction of the cylinder and guided by the inner surface of the cylinder and communication between the ribs and the opening are communicated with the peripheral wall. A piston having an annular convex portion projecting toward the valve seat portion on the peripheral portion of the closed end wall;
The leak port and the closure are smaller than the leak port and the annular projection, and are arranged so as to be in contact with the tip of the annular projection and move together with the piston so as to contact and separate from the valve seat portion. A pressure receiving member having a through hole facing the end wall;
A vacuum cleaner comprising: The vacuum cleaner of claim 1, wherein the pressure receiving member, wherein the Ru diameter der than the diameter of the circle drawn through the tips of each rib. The diameter of the pressure receiving member is substantially equal to the inner diameter of the cylinder, an electric vacuum cleaner according to claim 1, characterized in that that provided a plurality of vent grooves in the periphery of the pressure receiving member. The pressure receiving member is fixed to the tip of the annular convex portion by adhesion, and the annular convex portion is divided into a plurality of communication grooves that communicate between the inner side surrounded by the convex portion and the ribs. The vacuum cleaner according to claim 1.

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