JPH0576844B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a vacuum cleaner, and more particularly to a disinfection mechanism that kills harmful microorganisms such as mites contained in dust by exhaust air heat.

(Prior art) Conventionally, in the case of a vacuum cleaner capable of killing harmful microorganisms such as dust mites, for example, Japanese Patent Laid-Open No. 62-127026
As described in the publication, a structure is adopted in which a hose forms an exhaust circulation air path from the exhaust side of the electric blower to the dust collection chamber, and the heated exhaust air is repeatedly returned to the dust collection chamber. Disinfection is carried out by raising the temperature inside this dust collection chamber. However, in the conventional structure of this type, for example, a hose formed into a bellows shape with a thin coating made of soft vinyl chloride resin is repeatedly used for approximately 50 to 60 cycles.
Because the hose is exposed to high temperatures of around 30 degrees Fahrenheit, the shape of the hose becomes distorted, making it difficult to use the hose for sucking in dust.

Furthermore, vacuum cleaners in which an exhaust air circulation path is formed within the vacuum cleaner body are also known. In this conventional vacuum cleaner, the main body of the vacuum cleaner consists of a main body case and a lid body that has a connection port for the hose and opens and closes the dust collection chamber, but the exhaust circulation air passage is connected to the vicinity of the connection port. In normal vacuum cleaners, the exhaust circulation air path is blocked by a hose connected to the connection port, and when disinfecting, the hose is removed to communicate the exhaust circulation air path and the dust collection chamber, and it is attached and detached separately from the connection port. A structure is adopted in which a flexible closure body is attached to close the connection port. However, with this conventional structure, it is necessary to store the removable closure and there is a risk that the closure may be lost.

In addition, an exhaust circulation air path is formed within the vacuum cleaner body,
There is also known a vacuum cleaner in which a temperature sensing switch is disposed in the exhaust circulation air path to stop the electric blower when the temperature of the exhaust air reaches a predetermined temperature. In this vacuum cleaner, when the temperature of the exhaust air reaches a predetermined temperature, the temperature sensing switch turns off and stops the electric blower, but due to the influence of the outside temperature, the temperature of the exhaust air reaches the predetermined temperature at which the temperature sensing switch operates. There was a problem with variations in the time taken.

(Problems to be Solved by the Invention) As described above, in conventional vacuum cleaners, since the exhaust gas circulation air path is formed by a hose, there is a problem that the hose deteriorates due to heat. In addition, even conventional vacuum cleaners with an exhaust circulation air path formed inside the vacuum cleaner body had a separate removable blocker.
There were problems such as the tendency for the blocker to become powdery.

In addition, in this type of vacuum cleaner, if the temperature of the exhaust air varies due to the influence of the outside temperature until the circulating operation time reaches the predetermined temperature at which the temperature sensing switch operates, dust may be contained in the dust collection chamber. There was a problem that it was not possible to stably kill harmful microorganisms such as dust mites.

The present invention aims to solve these problems, and is capable of killing harmful microorganisms such as mites with heat without causing deterioration of the hose, has good operability, and eliminates the risk of parts becoming powdery. The purpose is to provide a vacuum cleaner without any Furthermore, the present invention provides a vacuum cleaner that can stably kill harmful microorganisms without being affected by outside temperature.

(Means for Solving the Problems) The vacuum cleaner of the invention according to claim 1 is provided with an electric blower and a dust collection chamber communicating with the intake side of the electric blower inside, and an opening facing the dust collection chamber. a main body case provided with a main body case, a lid body having a connection port to which a hose is detachably connected and which can open and close an opening of the main body case, and a lid body provided on the main body case to variably control the input of the electric blower. an exhaust circulation air passage communicating between the exhaust side of the electric blower and the connection port of the dust collection chamber is formed inside the main body case and the lid, and An externally operable air passage opening/closing means for opening and closing a part of the exhaust circulation air passage is provided at a position, and a temperature sensing element whose output varies depending on the temperature of the exhaust air flowing through the exhaust circulation air passage is provided in the control circuit. connection,
An electrical signal corresponding to the temperature of the exhaust air is output from the temperature sensing element to a control circuit, and input to the electric blower is controlled in accordance with the output from the control circuit.

The vacuum cleaner according to the invention described in claim 2 is provided in claim 1.
The vacuum cleaner according to the invention described above includes a connection port opening/closing means movably supported by the lid body for opening and closing the connection port, and the connection port opening/closing means includes an air path that closes the exhaust gas circulation air path when the connection port is opened. The connecting port opening/closing means and the air passage opening/closing means are provided with a closing part and a communication part which opens the exhaust circulation air passage when the connection port is closed and communicates the exhaust side of the electric blower with the dust collection chamber. It is integrated.

(Function) In the vacuum cleaner of the invention according to claim 1 of the present invention, during normal cleaning, etc., a part of the exhaust circulation air path is closed by the air path opening/closing means provided on the lid body.
Keep the exhaust side of the electric blower and the dust collection chamber isolated. On the other hand, when killing harmful microorganisms such as mites in the dust accumulated in the dust collection chamber, operate the air passage opening/closing means to open the exhaust circulation air passage and connect the exhaust side of the electric blower and the dust collection chamber. Keep it connected. When the electric blower is driven in this state, the heated exhaust air from the electric blower is returned to the dust collection chamber from the connection port of the lid through the exhaust circulation air passage inside the main body case and the lid, and is collected. As the temperature inside the dust chamber increases, the mites inside the dust collection chamber are killed or injured.

Furthermore, when the exhaust air is being circulated, a temperature sensing element in the air path through which the exhaust air passes senses the temperature of the exhaust air and outputs an electric signal according to this temperature to the control circuit. Controls the input of the electric blower according to the input electrical signal. This control, for example, increases the input to the electric blower when the detected temperature of the exhaust air is low, so that the temperature of the circulating exhaust air reaches a certain level at a constant pace without being affected by the outside temperature. Make it.

Moreover, in the vacuum cleaner of the invention according to claim 2,
When cleaning, that is, when connecting a hose to the connection port, the connection port is left open, but in this state, the air passage blocking part of the connection port opening/closing means is blocking a part of the exhaust circulation air path. , the exhaust side of the electric blower and the dust collection chamber are cut off. On the other hand, when not cleaning, to prevent dust from leaking from the dust collection chamber to the outside through the connection port, and to improve the appearance.
The connection port opening/closing means is moved and the connection port is closed by the connection port opening/closing means, but in this state, the exhaust circulation air path is opened by the air passage opening/closing means integrated with the connection port opening/closing means, and the exhaust side of the electric blower and It communicates with the dust collection room. Therefore, if the electric blower is driven in this state, the exhaust air from the electric blower will be returned to the dust collection chamber.

(Embodiment) Next, the configuration of an embodiment of the vacuum cleaner of the present invention will be described based on FIGS. 1 to 3.

In FIGS. 1 and 2, 11 is a vacuum cleaner main body, which includes a main body case 13 having an opening 12 formed in the upper front side, and a rear end portion pivoted to this main body case 13 so that the opening 12 can be opened and closed. It consists of a dust collection chamber lid body 14 which is closed. In addition, the main body case 1
3 consists of a lower main body case member 15 and an upper main body case member 16 which is coupled and fixed to the upper rear part of this lower main body case member 15. The inside of the main body case 13 is partitioned into the front and back by a partition wall 18 having a grid-like communication port 17 formed approximately in the center thereof, and a space behind this partition wall 18 is an electric blower room. 19, and the front space serves as a dust collection chamber 20 facing the opening 12.

Further, inside the electric blower chamber 19, there is a front support body 24 molded from rubber, which is sandwiched from above and below by support walls 21, 22, and 23 that are integrally formed on both the main body case members 15 and 16. An electric blower 26 is supported and fixed by the rear support member 25 with its intake side facing the communication port 17 . And, by the ring-shaped front support body 24,
The electric blower 26 is airtightly partitioned into an intake side and an exhaust side.

Further, an inner exhaust port 2 that communicates with the exhaust side of the electric blower 26 is provided on the rear surface of the main body case 13.
7 is formed as an opening, and an exhaust cover body 28 is pivotally mounted to cover the inner exhaust port 27 so as to be openable and closable.The exhaust cover body 28 has an outer exhaust port 29 formed therein. An exhaust filter 30 is disposed between these exhaust ports 27 and 29.

Furthermore, a cord reel 32 (shown in FIG. 3) for winding up a power cord 31 for feeding power to the electric blower 26 is pivotally supported at the rear part of the main body case 13, and the tip of the power cord 31 is rotatably supported. A plug 33 is connected to. Further, an accessory storage section 34 is formed on the rear upper surface of the main body case 13, and a storage chamber cover body 35 that covers the accessory storage chamber 34 in an openable and closable manner is pivotally mounted.

In addition, the communication port 17 is provided in the dust collection chamber 20.
A dust collection filter 41 is attached to cover the holder, and a support frame 42 is pivotally attached to the upper front side.

Reference numeral 43 denotes a dust collection bag detachably installed in the dust collection chamber 20, and this dust collection bag 43 is connected to the bag-shaped filter medium 44.
and a mouth frame 45, which is detachably held by the support frame 42. Furthermore, a seal packing 46 is provided around the entire circumference of the opening 12 facing the dust collection chamber 20, so that the lower peripheral edge of the lid 14 can be brought into close contact with the lower surface of the lid 14. The rear part of this seal packing 46 is connected to the partition wall 1 of both the main body case members 15 and 16.
It is held by 8. In addition, the main body case 13
A locking protrusion 47 is formed on the upper front surface.

The lid 14 consists of a case-shaped outer lid member 51 with an open bottom surface, and a plate-shaped inner lid member 53 that is coupled and fixed to the lower side of the outer lid member 51 with screws 52 or the like. A seal packing 54 is provided at the joint portion of both lid members 51 and 53.
is provided. And the outer lid member 5
A cylindrical connection port 55 into which one end of a hose (not shown) is removably inserted is formed in the front part of 1, slanting downward. On the other hand, a suction opening 56 is formed in the inner lid member 53 so as to face the connection port 55 . A connection port packing 57 is provided from the lower end peripheral edge of the connection port 55 to the peripheral edge of the suction opening 56.
Further, a recess 58 that opens outward is formed on one side of the connection port 55, and a pair of through holes 59 are formed in the bottom surface of this recess 58. Both lid members 51 and 5 face these through holes 59.
A pair of contact plates 60 are provided in the space between the hoses 3 and 3, with which a pair of contact pins 61 (shown in FIG. 3) provided at one end of the hose come into contact with each other.

Further, a spring 62 is provided on the front surface of the lid body 14.
A lamp 63 energized by is pivotally mounted,
The clamp 63 is removably engaged with the locking protrusion 47 of the main body case 13 to hold the lid 14 in a closed state.

Further, the space between the lid members 51 and 53 forms a lid-side exhaust circulation air passage 66, and a cylindrical air circulation passage is formed on the side of the connection port 55 facing this exhaust circulation air passage 66. A mouth 67 is formed. and,
An opening/closing plate 68 serving as an air passage opening/closing means for opening and closing the circulation opening 67 in a vertically slidable manner along the opening end of the circulation opening 67 is supported by support ribs 69 formed on the inner lid member 53. A flow opening 68a overlapping the flow opening 67 is formed in the lower part of the opening/closing plate 68. Further, the upper end portion of the opening/closing plate 68 penetrates the upper surface portion of the outer lid member 51 as a knob portion 70 and protrudes outward.
A seal packing 71 is provided at a portion of the outer lid member 51 through which the opening/closing plate 68 passes.

Further, an inlet 72 facing the exhaust circulation air passage 66 is formed in the rear surface of the lid body 14 facing the partition wall 18 on the front surface of the upper main body case member 16. A seal packing 73 is provided on the periphery of the lid body 14 so as to be brought into close contact with the partition wall 18 of the upper body case member 16 so as to be able to come into contact with and separate from the partition wall 18 when the lid body 14 is closed.

On the other hand, a main body side exhaust circulation air passage 74 is formed in the upper front part of the upper body case member 16 and communicates with a space on the exhaust side of the electric blower 26 in the electric blower chamber 19. Road 74
The front end of the partition wall 1 of the upper main body case member 16
The inlet 72 of the cover 14 overlaps with the outlet 75 when the cover 14 is closed, and the seal packing 73 of the inlet 72 overlaps with the outlet 75. It is adapted to be brought into close contact with the periphery of the outlet 75. Note that this seal packing 73 is attached to the outlet 7 of the main body case 13.
It may be provided on the 5th side.

Furthermore, a reset button 76 is provided in the exhaust air circulation air passage 66 of the lid body 14, and a thermostat 77, such as a bimetal switch, is normally closed and opens when the temperature exceeds a predetermined temperature, and returns to the closed state when the reset button 76 is operated. A reset button 76 of this thermostat 77 is exposed on the upper surface of the lid 14.

Further, the electric blower chamber 19 of the main body case 13
A positive direction thermistor 78 as a temperature sensing element is disposed at the upper part of the inside. In addition, this thermistor 7
8 is the lid side exhaust circulation air passage 66 or the dust collection chamber 2
It may be placed within 0 or the like. The same applies to the thermostat 77.

Next, the configuration of the control circuit 81 that variably controls the input of the electric blower 26 will be explained with reference to FIG.

The cord reel 3 connected to a commercial AC power source
A triax 85 to which a snubber circuit as a protection circuit consisting of a fuse 82, a resistor 83 and a capacitor 84 is connected, the electric blower 26, and a thermostat 77 are connected in series to both poles of the power cord 31 wound around the power cord 31. , this electric blower 2
6 has a noise prevention circuit 86 consisting of a capacitor.

The power cord 31 is connected to the primary winding of a step-down transformer 87, and the secondary winding of this transformer 87 is connected to a rectifier circuit 88 consisting of a diode bridge. has a resistance of 8
9 and a constant voltage circuit consisting of a Zener diode 90 are connected. This zena diode 9
A resistor 91 and a resistor 92 are connected in series in parallel with 0, and the gate of a programmable union transistor (PUT) 93 is connected to the connection point between the resistor 91 and the resistor 92.
The cathode of this PUT 93 is connected to one end of the primary winding of a transformer 94. A charging capacitor 95 is connected between the anode of the PUT 93 and the other end of the primary winding of the transformer 94.

Also, a resistor 9 is connected to the secondary winding of this transformer 94.
6, diode 7 is connected, triax 8
It is connected to gate 5.

Then, the connection point of the resistors 89 and 91, the
A resistor 98 connected to the PUT 93 is connected to a pair of switching elements 99a of a changeover switch 99, and a pair of first changeover contacts 99h of the switch 99 are connected to the pair of contact plates 60, respectively. . Further, the positive direction thermistor 78 is connected between a pair of second switching contacts 99c of the switch 99. Further, a variable resistor 100 is connected between the pair of contact pins 61 of the hose, and is provided in a grip portion of the hose so as to be externally operable.

The switch 99 may be operated by a user, but it may also be operated in conjunction with the opening/closing plate 68, for example. That is, the exhaust circulation air passage 6
When 6 is closed, the switch 99a is the first switch contact 99
b, and when the switching element 99a is opened, the switching element 99a may be brought into contact with the second switching contact 99c.

Next, the operation of the above embodiment will be explained.

During normal cleaning, one end of the hose is connected to the connection port 55, and the suction port is connected to the grip at the other end of the hose via an extension pipe or the like. Also,
As shown in FIG. 2, the opening/closing plate 68 is lowered to close the exhaust circulation air passage 66, and the dust collection chamber 20 is closed.
and the exhaust side of the electric blower 26 are kept in a state where they are cut off. At the same time, the switch 99 keeps the switching element 99a in contact with the first switching contact 99b. Then, by driving the electric blower 26,
Dust sucked in with the airflow from the inlet body is guided to the dust collection chamber 20 via the extension pipe and hose, and is stored in the dust collection bag 43. On the other hand, the airflow that has passed through the dust collection bag 43 passes through the dust collection filter 41 and the communication port 1.
7. Exhaust air is discharged from the outer exhaust port 29 through the electric blower chamber 19, the inner exhaust port 27, and the exhaust filter 30.

In addition, the user should also check the variable resistance 1 of the hose grip.
00 to adjust the input to the electric blower 26 and adjust the suction force. The electric blower 26 is controlled by a control circuit 81, and the operation of the control circuit 81 will now be described.

If the resistance value of the variable resistor 100 is increased, the charging time of the capacitor 95 becomes longer.
PUT turns on when the anode potential exceeds the gate voltage set by 1 and resistor 92.
93 is turned on, the phase control angle of the trigger of the triax 85 becomes large, and the electric blower 2
6 decreases, and the input to the electric blower 26 decreases. Conversely, when the resistance value of the variable resistor 100 becomes smaller, the charging time of the capacitor 95 becomes shorter, so the trigger phase control angle of the triax 85 becomes smaller and the input to the electric blower 26 increases.

Further, when disinfecting by killing harmful microorganisms such as mites in the dust collected in the dust collection chamber 20, the hose is removed from the connection port 55. Along with this,
The operator pinches the knob 70 to raise the opening/closing plate 68 to open the exhaust circulation air passage 66, thereby bringing the exhaust side of the electric blower 26 and the dust collection chamber 20 into communication. Furthermore, the switch 99 has a switch 99a that is connected to the second switch contact 99.
Keep it in contact with c.

Then, the electric blower 26 is driven, and a portion of the heated exhaust air from the electric blower 26 is
The exhaust gas is returned to the dust collection chamber 20 through the exhaust circulation air passages 74 and 66, the opening/closing plate 68, the circulation port and the connection port 55, and the exhaust air circulation air passages 74 and 66 are circulated from the electric blower 26 to the dust collection chamber 20.
Then, a circulating airflow is generated which reaches the electric blower 26 again through the dust collection chamber 20. As this circulating airflow is repeated and heated by the electric blower 26, the temperature inside the dust collection chamber 20 rises and reaches 50° C. or higher, which is sufficient to kill harmful microorganisms such as mites. When the circulating exhaust air reaches a certain temperature of about 55 to 60°C, the thermostat 77 opens and the electric blower 26 automatically stops. Since mites will die in 2 to 3 minutes at a temperature of 50°C or higher, if the thermostat 77 is opened at the above-mentioned temperature, mites can be sufficiently killed.

By the way, when the circulating airflow is generated as described above, the outside air also flows into the dust collection chamber 20 through the connection port 55.
However, even with this inflow of outside air, the temperature inside the dust collection chamber 20 continues to rise. Rather, it is better to let some outside air flow in and slowly raise the temperature, so that the thermostat 77 does not operate too quickly and is more effective in killing mites.

In addition, when circulating airflow is occurring, the positive direction thermistor 78
changes the resistance value. Therefore, the positive direction thermistor 78 outputs an electric signal according to the temperature to the control circuit 81, and the input to the electric blower 26 is controlled accordingly. That is,
The higher the temperature of the exhaust air, the higher the positive direction thermistor 78.
As the resistance value increases, the input to the electric blower 26 decreases, and conversely, the lower the temperature, the higher the input to the electric blower 26. Therefore, regardless of the outside temperature, the temperature of the circulating exhaust air reaches a certain level at an almost constant pace, and the temperature rise becomes more gradual as the temperature rises, making it difficult to keep the temperature constant. It is also possible to maintain

Note that by providing the positive direction thermistor 78 in this way, it is possible to prevent an excessive rise in temperature, so the thermostat 77 is not necessarily required.

According to the above configuration, simply by operating the opening/closing plate 68 supported by the lid 14, the cleaning state and the disinfecting state can be switched. In other words, since there are no removable parts for switching,
It is easy to use and there is no risk of losing this part.

Further, a structure in which the flow port 67 is closed with a separate opening/closing body 68 is more advantageous in maintaining airtightness than a structure in which the flow port 67 is closed with a hose.

In the above embodiment, the communication port 67 is formed in the connection port 55 as a part of the exhaust gas circulation air passage 66 and is opened and closed by the opening/closing plate 68.
may be provided at a position other than the connection port 55 of the outer lid member 51. However, this connection port 55
It is preferable to provide it near the dust collecting chamber 20 because the exhaust air will spread throughout the dust collecting chamber 20.

Next, another embodiment of the present invention will be described based on FIG.

In this embodiment, a mounting opening 106 is formed at the top of one side opposite to the recess 58 of the connection port 55 of the lid 14, and is located below one side of the mounting opening 106, with the top surface facing outward. The support protrusion 107 parallel to the upper surface of the lid member 51 is connected to the inner lid member 53.
is formed. And these support protrusions 10
Between the top surface of 7 and the top surface of the outer lid member 51,
A connection port cover body 108 serving as a connection port opening/closing means that also serves as an air passage opening/closing means is supported so as to be slidable in the horizontal direction and protrude into the connection port 55 from the mounting opening 106 . That is, this cover body 108 opens and closes the upper part of the connection port 55. The cover body 108 has a hollow box shape, and the closed side surface on the side of the connection port 55 is an air passage blocker that closes the mounting opening 106 that forms a part of the exhaust circulation air passage 66. It is designated as Section 109. The cover body 108 also has an inflow opening 1 facing the exhaust circulation air passage 66 on the opposite side surface.
10 is formed, and an outflow opening 111 that overlaps with the connection port 55 is formed on the lower surface, and these inflow opening 110 and outflow opening 111
The inside that communicates with the two forms a communication section 112.
Further, a knob 113 is formed at the end of the upper surface of the cover body 108 on the side of the air passage closing part 109, which protrudes outward from the connection port 55.

When cleaning, as shown in FIG. 4, the connection port cover body 108 is moved to the exhaust circulation air path 66 side, and the connection port 55 is left open. At this time, the air passage blocking portion 109 of the cover body 108 closes the mounting opening 10 in a part of the exhaust circulation air passage 66.
6 is closed, and the exhaust side of the electric blower 26 and the dust collection chamber 20 are cut off.

On the other hand, when not in use, that is, during storage, the cover body 108 is slid toward the connection port 55 by pinching the knob 113, thereby closing the upper portion of the connection port 55. At this time, the air passage closing portion 109 of the cover body 108 is fitted into the recess 58 of the connection port 55, and the through hole 59 facing the contact plate 60 is closed. Therefore, dust collection chamber 2
Dust inside the 0 does not leak to the outside through the connection port 55, and the appearance is good. Further, fine dust does not adhere to the contact plate 60, and reliability is improved.

Further, when the entire upper part of the connection port 55 is closed by the cover body 108 as described above, the entire outflow opening 111 of the cover body 108 is overlapped with the connection port 55, and the maximum area is the inflow opening 110, the communication part 11
2 and the exhaust air circulation path 6 through the outflow opening 111.
6 and the connection port 55 are communicated with each other, and the exhaust side of the electric blower 26 and the dust collection chamber 20 are communicated with each other. Therefore, if the electric blower 26 is driven in this state, the exhaust air will be returned to the dust collection chamber 20. Moreover, since the upper part of the connection port 55 is closed, a larger amount of exhaust air is returned to the dust collection chamber 20. Furthermore, by sliding the cover body 108, the opening area of the upper part of the connection port 55 and the connection port 55 and the outflow opening 1 can be increased.
Since the area of the overlapping portion 11 can be continuously changed in conjunction with the area, the ratio of the exhaust air flowing into the dust collection chamber 20 and the outside air can also be adjusted.

Further, according to the above configuration, one cover body 10
8 serves as both the air passage opening/closing means and the connection port opening/closing means, so it is possible to have a streamlined configuration and has good operability.

In this embodiment, a thermostat 77 or a positive thermistor 78 may be provided.

(Effects of the Invention) According to the invention as claimed in claim 1, an exhaust circulation air passage that communicates the exhaust side of the electric blower and the dust collection chamber is provided inside the main body case and the lid body that opens and closes the opening of the dust collection chamber. This makes it possible to kill harmful microorganisms such as mites without deteriorating the hose due to heat. Also, since the lid body is equipped with an air passage opening/closing means for opening and closing the exhaust circulation air passage, it is possible to use removable parts. Compared to a structure that opens and closes, operability is improved and there is no fear of the removable parts being lost.

Furthermore, a temperature sensing element is installed in the air passage through which the exhaust air passes.
By connecting this temperature-sensing element to a control circuit that variably controls the input of the electric blower, it is possible to ensure that the temperature of the circulating exhaust air reaches a certain level at a certain pace, for example, without being affected by the outside temperature. , it becomes possible to keep this temperature constant,
Stable operation can be achieved when killing harmful microorganisms.

Further, according to the invention as claimed in claim 2, since the connection port opening/closing means for opening and closing the connection port for connecting the hose is also used as the air passage opening/closing means for opening and closing the exhaust circulation air passage, an efficient configuration can be achieved. In addition, there is no need to operate both opening and closing means separately, and operability is improved.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the vacuum cleaner of the present invention, and FIG. 2 is a cross-sectional view of the vicinity of the same connection port.
FIG. 3 is a circuit diagram similar to the above, and FIG. 4 is a cross-sectional view of the vicinity of the connection port showing another embodiment of the present invention. 12...opening, 13...main case, 14...
... Lid body, 20 ... Dust collection chamber, 26 ... Electric blower,
55... Connection port, 66... Exhaust circulation air path, 68...
...Opening/closing plate as an air passage opening/closing means, 74...Exhaust circulation air passage, 78...Positive direction thermistor as a temperature sensing element, 81...Control circuit, 108...As a connection port opening/closing means that also serves as an air passage opening/closing means. connection port cover body, 109...air passage blocking part, 112...communication part.

Claims (1)

[Scope of Claims] 1. An electric blower and a main body case which is provided with an internal dust collection chamber communicating with the intake side of the electric blower and has an opening facing the dust collection chamber, and a hose is detachably connected to the main case. a lid body that has a connection port that freely opens and closes an opening of the main body case; and a control circuit that is provided in the main body case and that variably controls the input of the electric blower; An exhaust circulation air path is formed inside to communicate the exhaust side of the electric blower and a connection port of the dust collection chamber, and an external portion is provided near the connection port of the lid body for opening and closing a part of the exhaust circulation air path. An operable air passage opening/closing means is provided, a temperature sensing element whose output varies according to the temperature of the exhaust air flowing through the exhaust circulation air passage is connected to the control circuit, and the temperature sensing element changes the output according to the temperature of the exhaust air flowing through the exhaust circulation air passage. A vacuum cleaner characterized in that an electric signal generated by the electric blower is output to a control circuit, and input to an electric blower is controlled according to the output from the control circuit. 2. A connection port opening/closing means movably supported by the lid body for opening and closing the connection port, and the connection port opening/closing means includes an air passage blocking part that blocks the exhaust circulation air passage when the connection port is opened, and an air passage closing part that blocks the exhaust circulation air passage when the connection port is closed. A communication part is provided that opens the exhaust circulation air path and communicates the exhaust side of the electric blower with the dust collection chamber,
The vacuum cleaner according to claim 1, wherein the connection port opening/closing means and the air passage opening/closing means are integrated.