JPH05220069A - Vacuum cleaner - Google Patents

Abstract

PURPOSE:To prevent abnormal temperature rise accurately by arranging a temperature sensor in a space which creates temperature characteristic proportional directly to the maximum temperature within an electric cleaner formed by arranging the cooling plate and a temperature protector on a housing surface on the side of the cooling plate at a part of an exhaust passage of an electric blower. CONSTITUTION:Cooling air sucked with a fan 14 at an air suction port of an electric blower 8 of am a vaccum cleaner is exhausted at exhaust ports being shunted as indicated by the arrow. A cooling plate 36 is arranged at a part of a cooling air path 34 made up of a stator core 29 and a housing 20 covering about a half of the path 34 to form a space where no cooling air flows. A temperature protector mounted on the housing 20 is actuated by an output of a temperature sensor arranged in the space. Thus, an output of the temperature sensor becomes proportional directly to the maximum temperature in the cleaner thereby preventing abnormal rise in the temperature with the accuracy of temperature control improved at a low cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature protection device for an electric blower of a vacuum cleaner using the electric blower.

[0002]

2. Description of the Related Art Conventionally, a temperature protection device for a vacuum cleaner is attached to an exhaust passage of an electric blower inside a cleaner body or to a surface of a housing through which a cooling flow inside the electric blower flows. In general, although it is mounted on the surface of the motor coil, there are many restrictions on the shape and size fixing method of the temperature sensor and the thermo protector.

[0003]

DISCLOSURE OF THE INVENTION In detecting the temperature abnormality inside the vacuum cleaner, the present invention has a shape and a size of a thermo protector for mounting a temperature sensor or a thermo protector in order to detect a stable temperature. It is intended to allow stable installation, maintenance, and stable temperature detection.

[0004]

In order to solve the conventional problems, a part of an electric blower which is a heat source of an electric vacuum cleaner,
Even if the cooling air is stopped, there is a margin for the temperature to rise, and the temperature is stabilized without being affected by the intake air flow, because the condition for obtaining a linear temperature characteristic with respect to the maximum temperature point inside the vacuum cleaner is satisfied. As described above, a part of the flow path of the electric blower is closed, a part that is not directly affected by the temperature of the intake air flow is set, and a temperature sensor or a thermo protector is provided at that part.

[0005]

[Function] In order to stabilize the temperature without being affected by the intake air flow, a part of the flow path of the electric blower is closed, and the part that is not directly affected by the temperature of the intake air flow is set, and the maximum temperature inside the vacuum cleaner is set. It was possible to satisfy the condition that a linear temperature characteristic was obtained with respect to the point, and it was possible to create the optimum conditions for the installation location of the temperature control sensor and temperature protector.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to FIGS. In FIG. 1, a check valve and a suction packing 1 that also serves as a seal for the filter support portion 4 of the paper bag filter 3 are provided, and a hose opening 2 for connecting the hose and the cleaner body is provided.
The main body of the vacuum cleaner arranged at the latter stage of the hose port 2 is provided in the motor chamber 7 formed by the upper case 5 and the lower case 6,
The electric blower 8 and the drive circuit 52 that drives the electric blower 8 so as to be sandwiched between them, the front packing 9 and the rear packing 10 that support the electric blower 8, and the cylindrical air-permeable member that covers the electric blower 8. There is a sound absorbing material 11 made of sponge. In FIG. 3, the electric blower 8 has a fan casing 13 that covers the fan 14 from the intake side, and the fan 14 is fixed to the motor shaft 15 by a nut 16. A diffuser 17 is fixed to an end bracket 18 by bolts 19 at the rear stage of the fan 14. End bracket 18
Has a positioning hole 49 for a production jig. The housing 20 is provided on the side of the end bracket 18 opposite to the fan 14.
Are fixed with bolts. At the center of the end bracket 18 and the housing 20, there is an armature 22 rotatably supported at both ends by a ball bearing 21. The amateur 22 comprises an amateur coil 23, an amateur core 24 and a commutator 25. A brush 26 is slidably mounted on the commutator 25 and the housing 2
It is fixed by a brush holder 27 fixed to 0 and a push spring 28. In addition, the actuator 22 and the housing 20
In between, there is a stator core 29, and a stator coil 31 wound around a terminal block 30 is fixed. Stator core 2
9 is pressed into the housing 20. Again housing 2
A temperature protector 32 is provided on the outer periphery of the housing 20.
It is pressed by the temperature protector support 33 so as to be in close contact with and is fixed by screws. In FIG. 5, the stator core 29 is provided with a plurality of ventilation parts 34 for reducing ventilation resistance in the electric blower, and the temperature protector 32 is attached to an outer peripheral surface opposed to the plurality of ventilation parts 34. A cooling plate 36 having the shape shown in FIG. 2 is provided in at least one ventilation part 34 that opposes the temperature protector 32.
The hooks 35 at both ends of the terminal block 30 are locked to the terminal block 30, and are fixed by being sandwiched between the housing 20 and the end bracket 18. In FIG. 1, the upper case 5 is provided on the upper surface of the electric blower 8.
The handle 12 is rotatable via. Further, in front of the electric blower 8, a triac element 37 for controlling the phase of the electric blower 8 is attached integrally with a heat radiation fin 38. Further, as shown in FIG. 7, a cord 58 for supplying electric power is attached by a cord reel device 57 so as to be freely wound. The cord reel device 57 is arranged on the side surface of the electric blower 8, the exhaust filter 39 for trapping fine dust contained in the exhaust air from the electric blower 8 is provided behind the cord reel device 57, and the exhaust port 40 is provided behind the exhaust filter 39. .. As shown in FIG. 1, a component pocket 42 for accommodating the gap suction port 41 is provided in the space surrounded by the exhaust filter 39 and the electric blower 8, and a pocket lid 43 can be opened and closed in the component pocket 42. Installed on. A dust collection chamber 44 is formed in front of the electric blower 8 by the dust cover 45 and the lower case 6. The paper bag filter 3 is fixed inside the dust collecting chamber 44. Also dust cover 45
An indicator 46 is installed on a part of the lower case, and a caster 47 is provided on the front side and wheels 48 are provided on the rear side of the lower case.

With the above structure, in FIG. 1, the electric blower 8 is provided inside the dust collecting chamber 44 located in front of the main body.
Due to the generated intake flow, the dust and intake flow sucked from the suction port (not shown) pass through the extension pipe (not shown) and the bent pipe (not shown) and the hose (not shown). ,
Dust lid cover 45 attached to the front of the main body so that it can be opened and closed freely
The paper bag filter 3, which is sucked into the dust collecting chamber 44 via the hose port 2 in the front center, is attached to the hose port 2 via the suction packing 1 inside the dust collecting chamber 44 to separate dust and air flow. The dust is collected in the paper bag filter 3. The airflow separated from the dust was set to be relatively rough to protect the electric blower 8 when the paper bag filter 8 installed in front of the electric blower 8 inside the dust collection chamber 44 breaks and coarse dust leaks. It passes through the protection filter 50 and is sucked into the electric blower 8. As shown in FIG. 3, the air flow sucked into the electric blower 8 passes through the fan 14 and the diffuser 17, from the opening of the end bracket 18, to the space formed by the stator core 29 and the armature 22 inside the housing 20, and to the housing. 20 through the ventilation portion 34 formed by the stator core 29,
It is discharged into the electric vacuum cleaner through a housing opening 51 at the rear of the electric blower. At this time, the stator coil 31, the amateur coil 23 and the brush 26 are cooled. Further, as shown in FIG. 5, in order to change the cooling flow balance inside the electric blower 8 to a part of the cooling ventilation portion 34 formed by the stator core 29 and the housing 20 at the opening portion of the end bracket 18. It has the heat resistance of
Cooling plate 36 configured to cover approximately half of the
To form a space in which the cooling flow does not flow. As shown in FIG. 4, a temperature protector 32, which detects a temperature on the outer surface of the housing 20 and shuts off power when an abnormal temperature rise occurs, is provided at a position opposite to the inner space of the housing 20 by a temperature protector support 33. Is fixed to the housing 20 so as to come into pressure contact therewith. Since the cooling flow does not flow inside the ventilation part 34, stable temperature detection can be performed without being directly affected by the heat fluctuation of the electric blower due to the flow rate change caused by the load change during the cleaning work. In addition, since an air layer is provided between the heating element and the heat capacity, the heat capacity can be reduced and the recovery characteristics of a self-reset type temperature protector can be improved. Next, as shown in FIG. 7, the intake flow discharged from the housing opening 51 of the electric blower 8 cools the cord of the cord reel and passes through the exhaust filter 39 to collect and collect fine dust, which is then exhausted from the exhaust port 40. ..

In another embodiment shown in FIG. 6, since the cooling plate portion 60 is provided integrally with the end bracket 18, the number of parts and the number of working steps can be reduced.

In another embodiment, as shown in FIG.
The electric blower of the electric vacuum cleaner controlled by the microcomputer or the like is operated by the main controller 54 in the main body according to the instruction from the controller 54 and the information from the various sensors 53, and the electric blower 8 is optimally controlled via the power supply circuit 55. The temperature detection unit of the present invention of the electric blower 8 fetches temperature information into the main controller 54 through the temperature detection sensor 59 to detect and control an abnormal state, or to control the electric blower. A temperature sensitive switch such as a thermo protector is directly connected in series to the drive power circuit 55 of FIG. 8 and is fixed to the temperature detection part provided in the housing 20 of the electric blower 8 to detect an abnormal temperature of the electric blower during an abnormal load. The temperature was detected and the sensor judgment value and the temperature switch were set to the temperature before the abnormality occurred in the parts of the vacuum cleaner. Or abnormal temperature releasing corresponding such opening the bypass those performed.

According to one embodiment of the present invention, (1) it is possible to set a portion inside the electric blower that is not directly affected by the temperature of the intake air flow. (2) It is possible to satisfy the condition that a linear temperature characteristic is obtained with respect to the maximum temperature point inside the vacuum cleaner, and to create the optimum conditions for the installation location of the temperature control sensor and temperature protector. .. (3) The heat capacity and the sensitivity can be balanced, and the recovery characteristics of the temperature protector can be improved.

[0011]

EFFECTS OF THE INVENTION According to the present invention, (1) it is possible to reduce the fluctuation due to the mounting location of the sensor and the protector for temperature control, and (2) prevent the abnormal temperature rise of the electric blower and other vacuum cleaner parts. However, it is possible to ensure a long service life of the vacuum cleaner, and (3) it is inexpensive and can improve the accuracy of the temperature control of the vacuum cleaner.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a parts diagram of an embodiment of the present invention.

FIG. 3 is a sectional view of an embodiment of the present invention.

FIG. 4 is a perspective view of an embodiment of the present invention.

FIG. 5 is a partial assembly view of an embodiment of the present invention.

FIG. 6 is a partial assembly view of another embodiment of the present invention.

FIG. 7 is a sectional view of another embodiment of the present invention.

[Explanation of symbols]

3 ... paper bag filter, 5 ... upper case, 6 ... lower case, 8
... electric blower, 18 ... end bracket, 29 ... stator core, 31 ... stator coil, 32 ... temperature protector, 36 ... cooling plate, 52 ... drive circuit, 53
… Sensors, 54… Controllers, 55… Power circuits, 5
9 ... Temperature detection sensor, 60 ... Cooling plate section.

Claims (3)

[Claims] 1. An electric vacuum cleaner having a built-in electric blower, a drive circuit for driving the electric blower, a temperature protector for protecting the temperature of the electric blower, a paper bag filter for collecting dust, and the parts. In a vacuum cleaner composed of an upper case and a lower case for keeping it fixed by sandwiching, a cooling plate is provided in a part of a cooling core ventilation hole between a housing and a stator core inside a housing around which a stator coil of an electric blower is wound. A temperature protection device such as the temperature protector is closely fixed to the surface of the housing on the plate side, and a temperature fuse for the temperature protection or a temperature protector such as bimetal is attached to the power supply side of the electric blower or the secondary circuit side. An electric vacuum cleaner characterized by being inserted in series. 2. The main body structure according to claim 1, wherein the controller for driving the electric blower and the temperature for monitoring the temperature of the power supply circuit and the electric vacuum cleaner are based on the operation information obtained from the electric blower and the sensor. In an electric vacuum cleaner consisting of a detection case and a main body case composed of a dust collection filter, a cooling plate is provided in a part of the ventilation core for cooling between the stator core in the housing and the stator coil of the electric blower. The temperature detection sensor for temperature detection is closely attached to the surface of the housing on the side where the cooling plate is provided, and the temperature detection surface of the sensor is closely connected to the secondary circuit for controlling the vacuum cleaner. The controller monitors and controls the state of the vacuum cleaner based on the temperature information obtained by the temperature detection sensor. Vacuum cleaner to be. 3. A temperature protector according to claim 1, wherein an opening area for forming a flow path by the opening of the end bracket for cooling the stator coil, a side to which a temperature protection device or a temperature sensor is attached is attached to a temperature protector. A vacuum cleaner characterized by incorporating an electric blower that has an end bracket that does not open or has a smaller area and asymmetrically restricts the flow as compared with the side that does not have it.