JPH0425066Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a sealing device for a water heater in which the opening of a container is closed by a protective plate provided on the lower surface of a lid body that opens and closes the container body.

[Conventional technology]

Conventionally, a container body has a double-walled structure, consisting of a container and a case, and a lid body that can be opened and closed, and a sealing member is provided around the periphery of a protective plate that covers the bottom surface of the lid body. However, a water heater is known in which an annular receiving portion for receiving the sealing member is provided at the opening of the container. Moreover, in such a water heater, one in which an air pump is installed inside the lid body is known.

[The problem that the idea attempts to solve]

In the known water heater, when the lid body is closed, the sealing member at the periphery of the protective plate comes into close contact with the annular receiving portion of the container, thereby sealing the container.

However, when the pressure inside the container increases when the hot water or water (hereinafter collectively referred to as hot water) in the container is boiled, the protection plate is pushed up and a gap is created between the sealing member and the annular receiving portion. There is a problem that boiling steam leaks from the gap.

In addition, in water heaters with an air pump built into the lid body, when the air pump is activated, air is forced into the container and hot water is injected from the water inlet. As mentioned above, if air leaks from between the seal member and the annular receiving portion, there is a problem that water cannot be properly injected.

[Means to solve the problem]

The present invention solves the above problems and reduces the upward pushing force against the protection plate that would cause the sealing member to separate from the annular receiver when the pressure inside the container increases, and also prevents the sealing member from moving due to such pressure. The present invention provides a sealing device for a water heater that works to actively adhere to an annular receiving portion without separating from the annular receiving portion, and is configured such that a protective plate 44 is inclined downwardly from its periphery 44a in a centripetal direction. An introduction space 53 that forms a tapered portion 44b and gradually narrows toward the peripheral edge 44a between the tapered portion and the inner peripheral portion 3b of the opening of the container.
the sealing member 52 has a holding portion 52a that holds the peripheral edge 44a of the protection plate 44, and extends downward from the holding portion to reach the annular receiving portion and beyond the annular receiving portion; Seal portion 5 protruding toward the inner circumference
2b, and a pressure receiving chamber 56 which is formed between the tapered part and the inner peripheral side of the seal part and opens facing the introduction space.

In addition, the present invention provides an air pump 2 for pumping air into the container 3 to the lid body 2 in the water heater.
6 is installed internally, and a steam path 39 is formed that connects the inside of the container 3 to the outside air when the lid is closed;
The steam passage 39 may be provided with a switching valve 27 which allows the steam passage 39 to communicate with the inside of the container 3, while cutting off communication between the steam path 39 and the container 3 when the pump is in operation.

〔Example〕

An embodiment of the present invention will be described in detail below based on the drawings.

(Overall Configuration) As shown in FIGS. 1 and 2, the electric water heater consists of a container body 1 and a lid body 2.

The container body 1 includes a bottomed cylindrical container 3 made of a thin stainless steel plate or the like with an open top, and a cylindrical case 4 made of a thin metal plate or the like that surrounds the outer periphery of the container 3 at intervals. It has a double wall structure inside and outside. The container 3 is equipped with an electric boiling heater 5 on the outer periphery near the bottom, and a water pumping port 6 is provided near the bottom of the container 3 (bottom bottom surface or bottom peripheral surface). A shoulder member 7 is attached to the upper part of the container body 1, and the shoulder member 7 is integrally molded from synthetic resin, connects the upper end of the container 3 and the case 4, and has a pivot portion 8 of the lid body 2, which will be described later, on the back side. and a beak part 9 on the front part.
It is equipped with A decorative member 1 is provided at the bottom of this beak portion 9.
0 are arranged in series, and a transparent window portion 11 extending in the vertical direction is formed in the decorative member 10. On the other hand, a bottom member 12 made of synthetic resin is attached to the bottom of the container body 1.

The water pumping port 6 of the container 3 is communicated with a water filling port 13 opened at the lower part of the beak 9 of the shoulder member 7 via a pumping channel 14. In the illustrated example, the lower end of the liquid level display tube 15 arranged corresponding to the window 11 is connected via an elbow tube 17 to a mouth tube 16 fixed to the water pumping port 6 of the container 3 by welding or the like. There is. Further, the upper end of the liquid level display tube 15 is connected to a spout 18 that holds the water inlet 13 via an elbow tube 19, and the spout 18 and the water inlet 13 are covered by the beak 9. ing. In the illustrated example, the elbow tube 1
A valve chamber 20 is formed between the liquid volume indicator 9 and the upper end of the liquid level display tube 15, and a valve body 21 is inserted into the valve chamber. A narrow passage is formed between the outer periphery of the valve body 21 and the inner periphery of the valve chamber 20 by ribs in the radial direction. When the hot water is forced into the pumping channel 14, the hot water is sent to the spout 18 through the narrow passage formed by the ribs and is discharged from the water inlet 13. On the other hand, when the air pot falls over, the valve body 21 moves within the valve chamber 20 and closes the end opening of the elbow tube 19, so that the hot water in the container 3 flows into the pumping channel 1.
4. Prevents large amounts of water from leaking from the water inlet.

The lid main body 2 is formed into a hollow block body by a synthetic resin bowl-shaped base 22 that is loosely fitted into the shoulder member 7, and a head 23 that covers the upper part of the base 22. is pivotally supported on a pivot portion 8 of the shoulder member 7 via a pivot shaft 8a. Therefore, the axis 8a
The lid main body 2 is rotatable about the fulcrum, and thereby the upper opening of the container main body 1 can be opened and closed. In addition, a locking/disengaging mechanism 25a is provided on the front side of the lid body 2, and the lid 2 is connected to and disconnected from the shoulder member 7 while the entire lid 2 is attached to the container body 1.

A bellows-type air pump 26 is installed on the base 22 of the lid body 2, and the cylindrical lower edge of the air pump is fixed to the base 22, and the periphery of the actuating member 24 is fixed to the cylindrical upper edge. . The actuating member 24 forms a guide cylinder part 24b that projects into the air pump, and a valve cylinder 25 is slidably inserted into the guide cylinder part 24b. The lower end of the valve cylinder 25 is the base 2
A switching valve 27 made of an elastic body is provided at the insertion end of the valve 27, which is made of an elastic body and expands to a large diameter below the exhaust port 26a. Inside the air pump 26, a pump return member 28 made of a compression coil spring is interposed between the base 22 and the operating member 24, and is always biased in a direction to push up the operating member 24 and expand the air pump 26. are doing.
The valve cylinder 25 is provided with a locking part 29 that is locked in an extended state with respect to the guide cylinder part 24b, and the switching valve 27 is connected to the exhaust port 2 when the air pump 26 is expanded.
6a.

An actuation button 31 is slidably inserted into an opening cylindrical portion 30 located above the actuation member 24 and opened in the head 23 . When the locking pawl 32 formed on the outer peripheral edge of the lower end of the operating button 31 is engaged with the lower edge of the opening cylindrical portion 30, the top surface of the operating button 31 is substantially flush with the top surface of the head 23. , the actuation button 31 does not protrude upward any further. On the other hand, a lock member 33 is rotatably fitted on the outer periphery of the open cylindrical portion 30, and when the lock member 33 is rotated in one direction via a knob 33a, a locking claw at the lower end of the lock member 33 is engaged. can be locked to the lower surface of the locking pawl 32 of the actuation button 31, thereby making it impossible to press down the actuation button 31.
On the other hand, when the locking member 33 is rotated in the other direction,
The locking of the pawl is released so that the actuation button 31 can be pressed. A receiving part 34 is formed at the lower part of the operation button 31, and the receiving part 34
and the bottom of the valve cylinder 25, the pump return member 2
A button return member 35 made of a compression coil spring having a spring constant smaller than that of 8 is interposed, and the button return member 35 is inserted so that the operating button 31 is always pressed.
is biased upward. In this state, the intake valve 36 made of an elastic body and attached to the lower end of the receiving part 34 is positioned at a distance above the upper opening edge of the guide cylinder part 24b.

The exhaust port 26a is communicated with an air supply port 38 that opens near the top of the container 3 via an air supply path 37. Further, the air supply path 37 is communicated with an outside air port 40 opened in the head 23 via a steam path 39 . In the illustrated example, an air passage member 41 that forms the valve chamber of the switching valve 27 is attached to the lower surface of the base 22, and the air passage member 41 provides a port 42 located at the lower center of the valve chamber. The air supply passage 37 is arranged parallel to 42 and communicates with the valve chamber.
while defining a steam path 39 from said port 42.
A branch road 43 is defined. Branch road 43
is communicatively connected to a steam pipe 39b via a pipe material 39a, and the steam pipe 39b is communicatively connected to a cylindrical boss portion 39c forming the outside air port 40,
A steam path 39 is configured from the branch path 43 to the outside air port 40.

A protective plate 44 made of a stainless thin steel plate or the like serves as the pipe material 3 that constitutes the flow path member 41 and the steam path 39.
9a and the steam pipe 39b from below, and is fixed to the bottom of the base 22 with screws. In the figure, reference numeral 45 denotes a handle that is disposed across the top of the lid body 2 and whose both ends are pivoted to the container body 1.

To explain the action based on the valve mechanism, the container 3
While the water in the tank is being boiled, water is not injected, so the air pump 26 is not operated. When the pump is not operating, the pump return member 28 is extended and the operating member 24 is extended as shown in the first figure.
is pushed up to lift up the valve cylinder 25 that is locked at the locking portion 29, and the switching valve 27 closes the exhaust port 26a of the air pump. Therefore, the air supply port 38
The boiling steam that entered the air supply path 37 from the exhaust port 26
The air does not enter the air pump 26 from a. In this state, the switching valve 27 opens the port 42 of the branch passage 43 to communicate with the air supply passage 37 and the steam passage 39, so that the boiling steam entering the air supply passage 37 passes through the steam passage 39 to the outside air. It is discharged from the mouth 40 into the outside air. Therefore, the pressure generated when the water in the container 3 boils is suitably reduced by the path from the air supply port 38 to the outside air port 40 via the steam path 39.

On the other hand, while the hot water in the container 3 is kept at a predetermined temperature after boiling, the hot water can be poured by the air pump 26. That is, the air pump 26
When air is pumped into the container 3 by operating the
The water is poured out from the water inlet 13 through the water inlet. The air pump 26 is operated by pushing the operating button 31 into the open cylindrical portion 30 of the head 23. When the air pump is operated, as shown in the second figure, when the operating button 31 is lowered against the button return member 35, the locking pawl 32 comes into contact with the operating member 24, and the operating member 24 is simultaneously lowered against the pump return member 28 to compress the air pump 26. At this time, the intake valve 36 is connected to the intake opening 24 formed at the upper part of the guide cylinder portion 24b of the actuating member 24.
On the other hand, the valve cylinder 25 is lowered via the button return member 35, and the switching valve 27 is closed to the exhaust port 26.
a is opened, and the port 41 of the branch path 43 is closed. Therefore, the air discharged from the exhaust port 26a due to the compression of the air pump 26 flows through the steam path 3.
The air does not enter the air passageway 9 and leak, and is suitably fed under pressure into the container 3 through the air passageway 37 and through the air supply port 38 . In addition, when repeatedly operating the air pump 26, the operating button 31 is released from the pushing force, and the operating button 31 is returned to the air pump 2 by the button return member 35.
When the air pumps 6 are returned to their original positions by the pump return members 28, the intake valves 36 unblock the intake openings 24a, so that outside air is sucked into the air pumps 26 through the clearances between the members.

Thermistors 46 and 47 as temperature detectors are provided near the opening and at the bottom of the container 3, respectively.

Further, a water amount detection section 48 is provided at a position of the liquid amount display cylinder 15 corresponding to a liquid amount shortage. The water amount detection unit 48 includes a pair of electrodes 48a and 48b that sandwich the liquid amount display barrel 15 from the outer circumferential side, and electrically insulates both the electrodes 48a and 48b, respectively, and also electrically insulates the two electrodes 48a and 48b. , 48b are covered and surrounded by a cylindrical shield body.

A pocket portion 49 is formed by recessing the outer surface of the beak portion 9, and although not shown, the pocket portion 49 includes a boiling and heat retention indicator light made of a light emitting diode, and a pocket portion 49 made of a light emitting diode. It is equipped with a water shortage and timer operation indicator light, a boiling command switch, and a timer set switch. These indicator lights and switches are installed in advance on an insulating substrate, and this substrate is inserted into the pocket portion 49.

(Structure of the sealing device) As shown enlarged in FIGS. 3 and 4, the protective plate 44 that covers the lower surface of the lid main body 2 has a peripheral edge 44a.
Forming a tapered part 44b that slopes downward in the centripetal direction from the container 3, and forming an introduction space 53 that gradually becomes narrower toward the peripheral edge 44a between the tapered part 44b and the opening inner peripheral part 3b of the container 3 when the lid is closed; Said peripheral edge 44
A sealing member 52 is provided around a.

On the other hand, the container 3 has an opening edge bent toward the outer circumferential side to form a flange-like annular receiving part 3a, and the sealing member 52 is received by the annular receiving part 3a. Specifically, the inner peripheral wall 7 of the shoulder member 7
An inner peripheral flange 7b that protrudes inward is formed at the lower end of the inner peripheral flange 7b, and an elastic packing 54 is formed on the inner peripheral flange 7b.
The annular receiving portion 3a is polymerized via the annular receiving portion 3a.

The sealing member 52 is integrally molded from an elastic material such as rubber, and includes a holding part 52a that holds the periphery of the protection plate 44, and a holding part 52a that extends downward from the holding part 52a to reach the annular receiving part 3a. a seal portion 52b having an arcuate tongue-shaped cross section projecting inwardly beyond the annular receiving portion 3a; A pressure receiving chamber 56 opening facing the space 53 is formed.

Thus, when the lid is opened, the protection plate 44 follows the lid main body 2 and is opened, but when the lid is closed, the protection plate 44 brings the sealing member 52 of the peripheral edge 44a into close contact with the annular receiving portion 3a of the container 3. and seal the opening of the container 3. As mentioned above, when the hot water in the container 3 is boiled, the pressure in the container 3 is reduced through the steam path 39, but if the inner diameter of the air supply port 38 is small,
The pressure inside the container 3 will temporarily increase. Further, when water is poured, the air pump 26 is operated to close the port 42 and forcefully feed air into the container 3, so that the pressure inside the container 3 is increased. At this time, if the airtightness provided by the sealing member 52 is not working well, there may be problems such as steam leakage or air leakage making water injection work difficult. in this regard. In this embodiment, as shown in FIG. 3, the pressure inside the container 3 is tapered so that all the pressure does not act on the lower surface of the protective plate 44 in the direction of pushing the protective plate 44 directly upward. Section 44
b, and is dispersed in the centrifugal direction to reduce the force pushing up the protection plate 44. Moreover, the pressure concentrated in the vicinity of the peripheral edge 44a through the introduction space 53 is
As a result, the seal portion 52b is deformed in the expansion direction, and the seal portion 52b is pressed even more strongly against the annular receiving portion 3a. It is possible to prevent leakage and air leakage as much as possible.

(Configuration of Drain Path with respect to Steam Path) A drain path 50 is formed in the steam path 39, specifically, in the steam pipe 39b, and is branched and led to the back of the lid main body 2. In the illustrated example, as shown in an enlarged view in FIG. A tube 51 is integrally formed with leg portions 51c extending in the direction from an elastic material such as rubber, and the tube 51 is inserted through a through hole formed in the upright wall 22a at the back of the base 22. Press fit into the hole formed in the back wall of the tube 39b,
Thereby, the barrel 51 is held by the steam pipe and the standing wall 22a, and the head 51b is made to protrude from the back side of the standing wall 22a. Therefore, the cylindrical body portion 51a of the tube member 51 forms a drain path 50 that is open at both ends and communicates with the steam path 39. The head 51b is
A flange portion 51d extends in the outer circumferential direction from the body portion 51a, and an elastic mouth portion 51e has a substantially hemispherical shape and extends in the inner circumferential direction from the flange portion 51d,
Drain opening 51f surrounded by elastic opening 51e
form.

Preferably, the drain opening 51f is located as far down as possible from the pivot 8a of the lid main body 2, and as shown in FIG. At this time, it opens downward with respect to the lid body 2 and into the space above the container body 1. That is, when the lid is opened, the drain opening 51
Most preferably, f is located in the space above the opening of the container 3, but as shown in the figure, it is located at least in the space above the opening of the shoulder member 7, and is located in the space above the opening of the steam path 3.
When the water accumulated in the water heater 9 drips from the drain opening 51f through the drain passage 50, it is sufficient that the water droplets are located at a position where they return to the inside of the container 3 without spilling outside the water heater.

On the other hand, when the lid main body 2 is closed, the elastic opening 51e of the tube 51 is brought into close contact with the inner circumferential wall 7a of the shoulder member 7, as shown in the fourth figure, thereby closing the drain opening 51f in a watertight manner. It is configured in a positional relationship. That is, when the lid is closed, the elastic mouth portion 51e is compressively deformed and comes into close contact with the inner circumferential wall 7a of the shoulder member in a watertight manner, so that the steam from the steam passage 39 flows out from the drain opening 51f and the inner circumferential wall 7a of the shoulder member.
The area around the shaft 8a will not get wet.

[Effect of idea]

According to the invention described in claim 1 of the utility model registration, when the pressure inside the container 3 increases during boiling of hot water, the pushing force applied to the lower surface of the protection plate 44 is transmitted through the tapered part 44b. Moreover, this dispersed push-up force is absorbed into the pressure receiving chamber 56 of the sealing member 52, thereby making the sealing portion 52b of the sealing member 52 more tightly adhered to the annular receiving portion 3a. Since it deforms in the direction of

Furthermore, according to the present invention described in claim 2 of the utility model registration, the pressure inside the container 3 is reduced through the steam path 39 when hot water boils, so that the sealing member 52 and the annular receiving portion 3a are There is no risk that the sealing effect will deteriorate, and on the other hand, when water is injected by operating the air pump, the upward force applied to the lower surface of the protection plate 44 based on air pressure is applied in the centrifugal direction via the tapered portion 44b, as described above. Moreover, the dispersed push-up force is distributed to the pressure receiving chamber 56 of the sealing member 52.
This has the effect that the seal portion 52b is deformed in a direction to more tightly adhere to the annular receiving portion 3a, thereby preventing air leakage and suitably injecting water.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view showing one embodiment of the present invention, Fig. 2 is a partially cutaway longitudinal sectional view showing the state of the pump when it is in operation, and Fig. 3 is a longitudinal sectional view showing the main parts locally when the lid is closed. FIG. 4 is an enlarged partially cutaway vertical cross-sectional view of the main part when the lid is closed, and FIG. 5 is a partially cutaway vertical cross-sectional view showing the relationship between the lid body and the container body when the lid is opened. 1... Container body, 2... Lid body, 3... Container,
3a...Annular receiving part, 3b...Opening inner peripheral part, 4...
Case, 5... Boiling heater, 7... Shoulder member, 7
a...Inner peripheral wall, 8a...Pivot, 26...Air pump, 27...Switching valve, 39...Steam path, 42...
...Switching valve, 44...Protective plate, 44a...Periphery, 4
4b...Tapered portion, 52...Sealing member, 52a
...Holding part, 52b...Sealing part, 53...Introduction space, 56...Pressure receiving chamber.

Claims (1)

[Claims for Utility Model Registration] 1. A container body 1 comprising a container 3 and a case 4 and having a double wall structure inside and outside, and a lid body 2 which can be opened and closed freely, and which covers the lower surface of the lid body. In a water heater in which a sealing member 52 is provided around the periphery 44a of a protection plate 44, and an annular receiving portion 3a for receiving the sealing member is provided at the opening of the container: the protection plate 44 descends from the periphery in a centripetal direction. An inclined tapered portion 44b is formed, and the sealing member 5 is formed between the tapered portion and the opening inner peripheral portion 3b of the container.
The sealing member 52 includes a holding part 52a that holds the peripheral edge 44a of the protection plate 44, and an annular receiving part that extends downward from the holding part. a seal portion 52b that reaches the annular receiving portion and projects in the inner circumferential direction beyond the annular receiving portion, and a pressure receiver that is formed between the seal portion 52b and the tapered portion on the inner circumferential side of the seal portion and that opens facing the introduction space. A sealing device for a water heater, characterized in that: a chamber 56 is formed; 2 The lid main body 2 is equipped with an air pump 26 that pumps air into the container 3, and when the lid is closed, the container 3
A steam passage 39 is formed to communicate the inside of the air pump 26 with the outside air; the steam passage 39 is made to communicate with the inside of the container 3 when the pump is not in operation, while the steam passage 39 is connected to the container 3 when the pump is in operation. 3. A steam venting device for a water heater according to claim 1 or 2, characterized in that the device comprises a switching valve 27 that cuts off communication with the water heater.