JP7062941B2 - Cistern and hot water heater - Google Patents

Description

The present invention relates to a cistern and a hot water heater.

Conventionally, the cistern described in Patent Document 1 (Japanese Patent No. 4137878), the cistern described in Patent Document 2 (Japanese Patent No. 418894), and the cistern described in Patent Document 3 (Japanese Patent Laid-Open No. 2016-38156) have been used. Are known.

In the cistern described in Patent Document 1 and Patent Document 2, the housing has an upper wall. The upper wall is provided with a water replenishment port that penetrates the upper wall in the thickness direction. The cistern described in Patent Document 1 and Patent Document 2 has a water level sensor including a water level electrode.

In the cistern described in Patent Document 3, the housing has an upper wall and a side wall. The upper wall is provided with an electrode hole that penetrates the upper wall in the thickness direction. The side wall is provided with a water refill port that penetrates the side wall in the thickness direction. The cistern described in Patent Document 3 has a water level sensor including a water level electrode. The water level electrode is inserted through the electrode hole.

Japanese Patent No. 4137878 Japanese Patent No. 4188945 Japanese Unexamined Patent Publication No. 2016-38156

In the cistern described in Patent Document 1, the cistern described in Patent Document 2, and the cistern described in Patent Document 3, the water level sensor detects the contact between the hot water stored in the housing and the water level electrode in the housing. Detects the water level of hot water stored in.

In the cistern described in Patent Document 1 and the cistern of Patent Document 2, since the water replenishing port is provided on the upper wall of the housing, it may be difficult to reduce the thickness of the housing.

In the systan described in Patent Document 3, the electrode holes are provided on the upper wall of the housing, while the water refill port is provided on the side wall of the housing. Therefore, the direction of the hot water supplied from the refill port to the inside of the housing and the direction of the upper surface are close to parallel. As a result, the hot water supplied from the refill port to the inside of the housing easily reaches the water level electrode through the upper wall. When the hot water supplied from the refill port to the inside of the housing touches the water level electrode through the upper wall, the water level sensor is stored in the housing even though the water level of the hot water stored in the housing is low. There is a risk of erroneous detection that the water level of hot water has risen.

The present invention has been made in view of the above-mentioned problems of the prior art. More specifically, the present invention provides a cistern and a hot water heating device capable of suppressing erroneous detection of the water level of hot water stored in a housing.

The cistern according to one aspect of the present invention includes a housing and a water level sensor having electrodes. The housing has an upper wall including an inclined wall portion and a side wall. The upper wall is provided with an electrode hole that penetrates the upper wall in the thickness direction and through which an electrode is inserted. The side wall is provided with a water refill port that penetrates the side wall in the thickness direction. The inclined wall portion faces the refill port, is arranged at a position closer to the refill port than the electrode hole in the first direction along the central axis of the refill port, and inclines downward as the distance from the refill port increases. ..

In the cistern according to one aspect of the present invention, the hot water supplied from the refill port to the inside of the housing is reduced in momentum by coming into contact with the inclined wall portion before reaching the electrode through the upper wall. .. As a result, the hot water supplied from the refill port to the inside of the housing does not easily reach the electrodes through the upper wall. Therefore, in the systurn according to one aspect of the present invention, it is possible to suppress erroneous detection of the water level of hot water stored in the housing.

In the above systurn, the electrode holes may be arranged apart from a straight line passing through the central axis of the refill port in a plan view. In this case, the hot water supplied from the refill port to the inside of the housing becomes more difficult to reach the electrodes.

In the above-mentioned cistern, the inclined wall portion may be arranged above the portion of the upper wall provided with the electrode holes.

In the above-mentioned cistern, the housing may further have a first hanging wall extending downward from the upper wall and extending so as to intersect the first direction in a plan view. The first hanging wall may be arranged between the electrode hole and the inclined wall portion in the first direction.

In this case, the hot water that has been in contact with the inclined wall portion and whose momentum has been diminished is further diminished in momentum by further contacting the first hanging wall before reaching the electrode through the upper wall. Therefore, in this case, the hot water supplied from the refill port to the inside of the housing becomes more difficult to reach the electrodes.

In the above cistern, the first hanging wall may extend along a second direction orthogonal to the first direction in plan view. In this case, since the direction of the flow of hot water supplied from the refill port to the inside of the housing 1 and the extending direction of the first hanging wall are orthogonal to each other, the momentum of the hot water is particularly strongly diminished. Therefore, in this case, the hot water supplied from the refill port to the inside of the housing becomes more difficult to reach the electrodes.

In the above cistern, the first hanging wall may include a first end and a second end, which is the opposite end of the first end, in plan view. In a plan view, the distance between the first end and the electrode hole in the first direction is smaller than the distance between the second end and the electrode hole in the first direction, and the distance between the first end and the electrode hole in the second direction. May be greater than the distance between the second end and the electrode hole in the second direction.

In this case, the hot water that has come into contact with the first hanging wall is guided away from the electrode hole by the first hanging wall, so that it becomes more difficult to reach the electrode.

In the above cistern, the first hanging wall may be formed integrally with the upper wall. In this case, the first hanging wall functions not only as a member for reducing the momentum of hot water supplied from the refill port to the inside of the housing, but also as a reinforcing rib for reinforcing the upper wall.

In the above cistern, the housing extends downward from the upper wall, and also extends downward from the upper wall to a plurality of second hanging walls extending parallel to the first hanging wall in a plan view. In addition to being present, it may further have a plurality of third hanging walls extending so as to intersect the first hanging wall in a plan view. The second hanging wall and the third hanging wall may be formed integrally with the upper wall. In this case, the upper wall can be further reinforced by the second hanging wall and the third hanging wall.

The hot water heating device according to one aspect of the present invention includes the above-mentioned system. According to the hot water heating device according to one aspect of the present invention, it is possible to suppress erroneous detection of the water level of hot water stored in the housing of the cistern.

According to the cistern and the hot water heating device according to one aspect of the present invention, it is possible to suppress erroneous detection of the water level of hot water stored in the housing of the cistern.

FIG. 3 is a top view of the housing 1 in the cistern according to the first embodiment. It is a bottom view of the housing 1 in the cistern which concerns on embodiment 1. It is a side view of the housing 1 in the cistern which concerns on embodiment 1. It is sectional drawing in IV-IV of FIG. It is sectional drawing in VV of FIG. FIG. 3 is a bottom view of the lid portion 1d in the cistern according to the first embodiment. It is a schematic diagram for demonstrating the effect of the cistern which concerns on Embodiment 1. FIG. FIG. 3 is a bottom view of the lid portion 1d in the cistern according to the second embodiment. It is a schematic diagram for demonstrating the effect of the cistern which concerns on Embodiment 2. It is a schematic diagram which shows the structure of the hot water heating apparatus which concerns on Embodiment 3.

Embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts are designated by the same reference numerals, and duplicate explanations will not be repeated.

(Embodiment 1)
Hereinafter, the configuration of the cistern according to the first embodiment will be described with reference to FIGS. 1 to 6.

As shown in FIGS. 1 to 3, the cistern according to the first embodiment has a housing 1 and a water level sensor 2. The housing 1 has an upper wall 11, a side wall 12, and a bottom wall 13. The housing 1 is made of, for example, a resin material. Preferably, the height of the housing 1 is smaller than the width W1 and the width W2 of the housing 1. The width W1 is the width of the housing 1 in the direction along the second direction DR2 described later, and the width W2 is the width of the housing 1 in the direction along the first direction DR1 described later.

The housing 1 has, for example, a first portion 1a, a second portion 1b, and a third portion 1c in a plan view. In the following, the plan view means a case where the housing 1 is viewed from a direction orthogonal to the upper wall 11. The second portion 1b and the third portion 1c are portions protruding from the first portion 1a. From another point of view, the housing 1 has a U-shape in a plan view. However, the shape of the housing 1 in a plan view is not limited to this. For example, the housing 1 may have a rectangular shape in a plan view.

As shown in FIG. 2, the bottom wall 13 is provided with a pipe connection port 13a, a pipe connection port 13b, and a pipe connection port 13c. Preferably, the pipe connection port 13a and the pipe connection port 13b are provided on the bottom wall 13 located in the first portion 1a. Preferably, the pipe connection port 13c is provided on the bottom wall 13 located in the third portion 1c. The pipe connection port 13a, the pipe connection port 13b, and the pipe connection port 13c communicate with the inside of the housing 1.

The upper wall 11 is provided with an electrode hole 11a and an electrode hole 11b. Preferably, the electrode hole 11a and the electrode hole 11b are provided on the upper wall 11 located in the first portion 1a. As shown in FIG. 4, the electrode hole 11a and the electrode hole 11b penetrate the upper wall 11 in the thickness direction. The upper wall 11 has an inclined wall portion 11c.

The water level sensor 2 has an electrode 21 and an electrode 22. The water level sensor 2 detects the water level of the hot water stored in the housing 1 by detecting the contact between the electrodes 21 and 22 and the hot water stored in the housing 1. More specifically, the water level sensor 2 is stored in the housing 1 by detecting the current flowing when the electrodes 21 and 22 and the hot water stored in the housing 1 come into contact with each other. Detects the water level of hot water.

The electrode 21 and the electrode 22 are inserted into the electrode hole 11a and the electrode hole 11b, respectively. The length of the electrode 21 and the length of the electrode 22 are different from each other. More specifically, the electrode 21 is longer than the electrode 22. As a result, the water level sensor 2 can detect a plurality of water levels of hot water stored in the housing 1. For example, when the water level of the hot water stored in the housing 1 is lower than the water level detected by the electrode 21, the hot water is supplied from the refill port 12a to the inside of the housing 1 and is higher than the water level detected by the electrode 22. However, when the water level of the hot water stored in the housing 1 is high, the supply of hot water from the refill port 12a to the inside of the housing 1 is stopped.

As shown in FIG. 5, the side wall 12 is provided with a water replenishment port 12a. Preferably, the refill port 12a is provided on the side wall 12 located in the second portion 1b. The water replenishment port 12a penetrates the side wall 12 in the thickness direction. Hot water is supplied from the water replenishment port 12a to the inside of the housing 1. In the following, the direction along the central axis of the refill port 12a is referred to as the first direction DR1.

The straight line passing through the central axis of the water refill port 12a is defined as a straight line L. In a plan view, the electrode holes 11a and the electrode holes 11b are arranged at positions separated from the straight line L.

The inclined wall portion 11c faces the refill port 12a. The inclined wall portion 11c is preferably located in the second portion 1b. The inclined wall portion 11c is separated from the portion of the side wall 12 provided with the water refill port 12a in the first direction DR1. The inclined wall portion 11c is inclined downward as the distance from the refill port 12a increases. The inclined wall portion 11c is preferably located above the portion of the upper wall 11 where the electrode holes 11a and the electrode holes 11b are provided. In the following, the upper direction means the direction from the bottom wall 13 to the upper wall 11, and the lower direction means the direction from the upper wall 11 to the bottom wall 13.

The inclined wall portion 11c forms an angle θ with the horizontal direction. The angle θ is greater than 0 ° and less than 90 °. The angle θ is preferably 30 ° or more and 50 ° or less. The angle θ is particularly preferably 35 ° or more and 45 ° or less.

As shown in FIG. 1, the inclined wall portion 11c is arranged at a position closer to the water refill port 12a than the electrode hole 11a and the electrode hole 11b in the first direction DR1. From another point of view, the inclined wall portion 11c is arranged on the hot water path from the refill port 12a to the portion of the upper wall 11 where the electrode hole 11a and the electrode hole 11b are provided. ..

As shown in FIG. 5, the housing 1 preferably further has a first hanging wall 14. The first hanging wall 14 extends downward from the upper wall 11. As shown in FIG. 6, the first hanging wall 14 extends so as to intersect the first direction DR1 in a plan view. Preferably, the first hanging wall 14 extends in a direction orthogonal to the first direction DR1 in a plan view. In the following, the direction orthogonal to the first direction DR1 is referred to as a second direction DR2. The first hanging wall 14 has a plate-like shape. The first hanging wall 14 is preferably formed integrally with the upper wall 11.

The housing 1 may further have a plurality of second hanging walls 15. The second hanging wall 15 extends downward from the upper wall 11. The second hanging wall 15 extends parallel to the first hanging wall 14 in a plan view. The second hanging wall 15 has a plate-like shape. Each of the second hanging walls 15 is spaced apart. The second hanging wall 15 is preferably formed integrally with the upper wall 11.

The housing 1 may further have a plurality of third hanging walls 16. The third hanging wall 16 extends downward from the upper wall 11. The third hanging wall 16 extends in a direction intersecting the first hanging wall 14 in a plan view. It is preferable that each of the third hanging walls 16 extends in parallel. The third hanging wall 16 has a plate-like shape. Each of the third hanging walls 16 is spaced apart. The third hanging wall 16 is preferably formed integrally with the upper wall 11.

The housing 1 is composed of, for example, a lid portion 1d and a main body portion 1e. The lid portion 1d is composed of an upper wall 11 and a portion of a side wall 12 located on the upper wall 11 side. Preferably, the refill port 12a is provided on the side wall 12 constituting the lid portion 1d. The main body portion 1e is composed of the rest of the housing 1 excluding the lid portion 1d. The lid portion 1d and the main body portion 1e are joined to each other by, for example, hot plate welding.

As shown in FIG. 4, the lid portion 1d has a height H1. The first hanging wall 14, the second hanging wall 15, and the third hanging wall 16 have a height H2. The height H2 prevents the ends of the first hanging wall 14, the second hanging wall 15, and the third hanging wall 16 from melting when the lid portion 1d and the main body portion 1e are joined by hot plate welding. Therefore, the height is preferably lower than H1. The height H2 is preferably, for example, 3.3 mm or more.

The effect of the cistern according to the first embodiment will be described below.
As shown in FIG. 7, hot water is supplied from the refill port 12a to the inside of the housing 1 (the flow of this hot water is indicated by a solid arrow in FIG. 7). The inclined wall portion 11c faces the refill port 12a in the first direction DR1 and is located closer to the refill port 12a than the electrode hole 11a and the electrode hole 11b in the first direction DR1. Therefore, the hot water collides with the inclined wall portion 11c before reaching the electrode hole 11a and the electrode hole 11b through the upper wall 11, and the momentum is diminished.

If the hot water supplied from the refill port 12a passes through the upper wall 11 and reaches the electrodes 21 and 22, the hot water may cause erroneous detection of the water level sensor 2. The more the momentum of the hot water is diminished, the more difficult it is for the hot water to reach the portion where the electrodes 21 and 22 are arranged through the upper wall 11. Therefore, according to the cistern according to the first embodiment, it is possible to suppress erroneous detection of the water level of the hot water stored in the housing 1.

The hot water supplied from the refill port 12a mainly flows in the direction along the straight line L (that is, the first direction DR1). In the system according to the first embodiment, when the electrode holes 11a and the electrode holes 11b are arranged apart from the straight line L in a plan view, the electrode holes 11a and the electrode holes 11b are supplied from the refill port 12a. Since it is separated from the main flow of hot water, it is difficult for the hot water supplied from the refill port 12a to reach the portion where the electrode 21 and the electrode 22 are arranged through the upper wall 11. Therefore, in this case, it is possible to further suppress erroneous detection of the water level of the hot water stored in the housing 1.

In the cistern according to the first embodiment, when the first hanging wall 14 is provided, the hot water supplied from the refill port 12a is reduced in momentum by contact with the inclined wall portion 11c, and then the first hanging wall 14 is provided. Contact with. As a result, the momentum of this hot water will be further diminished. Therefore, in this case, it is possible to further suppress erroneous detection of the water level of the hot water stored in the housing 1.

In the system according to the first embodiment, when the first hanging wall 14 extends along the second direction DR2 in a plan view, the direction of the flow of hot water supplied from the refill port 12a and the first hanging wall 14 The momentum of this hot water is particularly strongly diminished because it is orthogonal to the extending direction. Therefore, in this case, it is possible to further suppress erroneous detection of the water level of the hot water stored in the housing 1.

In the cistern according to the embodiment, when the first hanging wall 14 is integrally formed with the upper wall 11, the first hanging wall 14 is only as a member for diminishing the momentum of the hot water supplied from the refill port 12a. It also functions as a reinforcing rib for reinforcing the upper wall 11.

In the cistern according to the embodiment, when the second hanging wall 15 and the third hanging wall 16 are further provided, the function as the reinforcing rib is further enhanced.

(Embodiment 2)
Hereinafter, the configuration of the cistern according to the second embodiment will be described with reference to FIG. In the following, the points different from the configuration of the cistern according to the first embodiment will be mainly described, and the duplicated description will not be repeated.

The cistern according to the second embodiment has a housing 1 and a water level sensor 2. The housing 1 has an upper wall 11, a side wall 12, and a bottom wall 13. The housing 1 further includes a first hanging wall 14, a second hanging wall 15, and a third hanging wall 16. The upper wall 11 is provided with an electrode hole 11a and an electrode hole 11b. The upper wall 11 has an inclined wall portion 11c. The side wall 12 is provided with a water replenishment port 12a. In these respects, the configuration of the cistern according to the second embodiment is common to the configuration of the cistern according to the first embodiment.

However, the configuration of the cistern according to the second embodiment is different from the configuration of the cistern according to the first embodiment with respect to the details of the configuration of the first hanging wall 14. This point will be described in detail below.

As shown in FIG. 8, the first hanging wall 14 has a first end 14a and a second end 14b which is the opposite end of the first end 14a. The first end 14a and the second end 14b are the ends of the first hanging wall 14 in a plan view. The first hanging wall 14 extends from the first end 14a toward the second end 14b in a plan view.

In a plan view, the distance between the first end 14a and the electrode hole 11a and the electrode hole 11b in the first direction DR1 is smaller than the distance between the second end 14b and the electrode hole 11a and the electrode hole 11b in the first direction DR1. In a plan view, the distance between the first end 14a and the electrode hole 11a and the electrode hole 11b in the second direction DR2 is larger than the distance between the second end 14b and the electrode hole 11a and the electrode hole 11b in the second direction DR2.

The effect of the cistern according to the second embodiment will be described below. In the following, the points different from the effect of the cistern according to the first embodiment will be mainly described, and the duplicated description will not be repeated.

As shown in FIG. 9, the hot water supplied from the refill port 12a to the inside of the housing 1 collides with the inclined wall portion 11c and then further collides with the first hanging wall 14 (note that in FIG. 9, this is The flow of hot water is indicated by a solid arrow).

As described above, in the systan according to the second embodiment, in the plan view, the distance between the first end 14a and the electrode hole 11a and the electrode hole 11b in the first direction DR1 is the second end 14b, the electrode hole 11a, and the electrode hole 11b. The distance between the first end 14a and the electrode hole 11a and the electrode hole 11b in the second direction DR2 is smaller than the distance in the first direction DR1 and the second end 14b, the electrode hole 11a, and the electrode hole 11b. It is larger than the distance in the second direction DR2 of.

The hot water that collides with the first hanging wall 14 easily moves along the extending direction of the first hanging wall 14. That is, the hot water that has collided with the first hanging wall 14 is guided in a direction away from the electrode hole 11a and the electrode hole 11b along the first hanging wall 14, so that the electrode 21 and the electrode 22 run through the upper wall 11. It becomes difficult to reach the part where is placed. Therefore, according to the cistern according to the second embodiment, it is possible to further suppress erroneous detection of the water level of the hot water stored in the housing 1.

(Embodiment 3)
Hereinafter, the configuration of the hot water heating device according to the third embodiment will be described with reference to FIG.

As shown in FIG. 10, the hot water heating device according to the third embodiment includes a systurn 31, a primary heat exchanger 32a, a secondary heat exchanger 32b, a burner 32c, a pipe 33a, a pipe 33b, a pipe 33c, and a pipe 33d. It has a pipe 33e, a pipe 33f, a pipe 33g, a thermal valve 34, and a pump 35. The cistern 31 is the cistern according to the first embodiment or the cisturn according to the second embodiment.

One end of the pipe 33a is connected to the systurn 31. Specifically, one end of the pipe 33a is connected to the refill port 12a of the systurn 31. The other end of the pipe 33a is connected to the water supply. One end of the pipe 33b is connected to the systurn 31. Specifically, one end of the pipe 33b is connected to the pipe connection port 13a of the systurn 31. The other end of the pipe 33b is connected to a portion where one end of the pipe 33c and one end of the pipe 33d are connected. The other end of the pipe 33c is connected to the primary heat exchanger 32a. The other end of the pipe 33d is connected to the low temperature heating terminal 36b.

The pipe 33e is connected to the primary heat exchanger 32a at one end and to the high temperature heating terminal 36a at the other end. The pipe 33f is branched at one end, one of which is connected to the high temperature heating terminal 36a and the other of which is connected to the low temperature heating terminal 36b. The other end of the pipe 33f is connected to the secondary heat exchanger 32b. One end of the pipe 33g is connected to the secondary heat exchanger 32b. The other end of the pipe 33g is connected to the systurn 31. Specifically, the other end of the pipe 33g is connected to the pipe connection port 13b of the systurn 31.

The burner 32c is arranged in the vicinity of the primary heat exchanger 32a. The thermal valve 34 is arranged on the path of the pipe 33d. The pump 35 is arranged on the path of the pipe 33b. Although not shown, the pipe 33h is connected to the pipe connection port 13c of the systurn 31.

The operation of the hot water heating device according to the third embodiment will be described below.
The hot water stored in the housing 1 of the systurn 31 is supplied to the primary heat exchanger 32a by the pump 35 via the pipe 33b and the pipe 33c. The hot water supplied to the primary heat exchanger 32a exchanges heat with the combustion gas emitted from the burner 32c, and the temperature rises. The hot water that has passed through the primary heat exchanger 32a is supplied to the high temperature heating terminal 36a via the pipe 33e.

The temperature of the hot water supplied to the high-temperature heating terminal 36a is lowered by performing the heating operation. The hot water that has passed through the high temperature heating terminal 36a is supplied to the secondary heat exchanger 32b via the pipe 33f. The hot water supplied to the secondary heat exchanger 32b exchanges heat with the residual heat of the combustion gas that has exchanged heat with the primary heat exchanger 32a, and the temperature rises again. The hot water that has passed through the secondary heat exchanger 32b returns to the inside of the housing 1 of the systurn 31 via the pipe 33g.

The hot water stored in the housing 1 of the systurn 31 is supplied to the low temperature heating terminal 36b by the pump 35 via the pipe 33b, the pipe 33d and the thermal valve 34. The temperature of the hot water supplied to the low-temperature heating terminal 36b is lowered by performing the heating operation. The hot water that has passed through the low-temperature heating terminal 36b returns to the inside of the housing 1 of the systurn 31 via the pipe 33f, the secondary heat exchanger 32b, and the pipe 33g.

The water level sensor 2 of the systurn 31 detects the water level of the hot water stored in the housing 1 by detecting the contact between the electrode 21 and the electrode 22 and the water surface of the hot water stored in the housing 1. do. When the electrode 21 longer than the electrode 22 is not in contact with the hot water stored in the housing 1, the hot water is supplied into the housing 1 of the systurn 31 via the pipe 33a. When the hot water stored in the housing 1 overflows in the housing 1, the hot water is discharged to the outside through the pipe connection port 13c and the pipe 33h of the systurn 31.

The water pressure of the hot water supplied into the housing 1 of the systurn 31 via the pipe 33a is relatively high, for example, about 350 kPa. As described above, since the momentum of the hot water is diminished by coming into contact with the inclined wall portion 11c, it is difficult to reach the electrode 21 and the electrode 22 through the upper wall 11. Therefore, even if hot water is supplied into the housing 1 of the systurn 31 at a relatively high water pressure via the pipe 33a, erroneous detection of the water level sensor 2 is unlikely to occur.

When the water level of the hot water stored in the housing 1 rises due to the supply of hot water into the housing 1 via the pipe 33a, the water surface of the hot water stored in the housing 1 comes into contact with the electrode 22. When the contact between the water surface of the hot water stored in the housing 1 and the electrode 22 is detected, the supply of hot water to the housing 1 via the pipe 33a is stopped.

The embodiments disclosed this time should be considered to be exemplary in all respects and not restrictive. The scope of the present invention is shown not by the above-described embodiment but by the scope of claims, and is intended to include the meaning equivalent to the scope of claims and all modifications within the scope.

The above embodiments are particularly advantageously applied to cisterns and hot water heating devices using cisterns.

1 Housing, 1a 1st part, 1b 2nd part, 1c 3rd part, 1d lid part, 1e main body part, 11 upper wall, 11a electrode hole, 11b electrode hole, 11c inclined wall part, 12 side wall, 12a refill port , 13 Bottom wall, 13a, 13b Piping connection port, 14 1st hanging wall, 14a 1st end, 14b 2nd end, 15 2nd hanging wall, 16 3rd hanging wall, 2 water level sensor, 21 and 22 electrodes, 31 Systurn, 32a primary heat exchanger, 32b secondary heat exchanger, 32c burner, 33a, 33b, 33c, 33d, 33e, 33f, 33g, 33h piping, 34 thermal valve, 35 pump, 36a high temperature heating terminal, 36b low temperature Heating terminal, DR1 1st direction, DR2 2nd direction, H1, H2 height, L straight line, W1, W2 width, θ angle.

Claims (9)

An upper wall including an inclined wall portion, a housing having a side wall, and a housing.
Equipped with a water level sensor with electrodes
The upper wall is provided with an electrode hole that penetrates the upper wall in the thickness direction and through which the electrode is inserted.
The side wall is provided with a water refill port that penetrates the side wall in the thickness direction.
The inclined wall portion faces the water replenishment port, is arranged at a position closer to the water replenishment port than the electrode hole in the first direction along the central axis of the water replenishment port, and downwards as the distance from the water replenishment port increases. A cistern that slopes toward. The system according to claim 1, wherein the electrode holes are arranged apart from a straight line passing through the central axis of the water replenishment port in a plan view. The cistern according to claim 1 or 2, wherein the inclined wall portion is arranged above the portion of the upper wall provided with the electrode hole. The housing extends downward from the upper wall and further has a first hanging wall extending so as to intersect the first direction in a plan view.
The cistern according to any one of claims 1 to 3, wherein the first hanging wall is arranged between the electrode hole and the inclined wall portion in the first direction. The cistern according to claim 4, wherein the first hanging wall extends along a second direction orthogonal to the first direction in a plan view. The first hanging wall includes a first end and a second end, which is the opposite end of the first end, in a plan view.
In a plan view, the distance between the first end and the electrode hole in the first direction is smaller than the distance between the second end and the electrode hole in the first direction.
Claimed that, in a plan view, the distance between the first end and the electrode hole in the second direction orthogonal to the first direction is larger than the distance between the second end and the electrode hole in the second direction. The cistern according to 4. The cistern according to any one of claims 4 to 6, wherein the first hanging wall is integrally formed with the upper wall. The housing extends downward from the upper wall, a plurality of second hanging walls extending parallel to the first hanging wall in a plan view, and extending downward from the upper wall. In addition, it further has a plurality of third hanging walls extending so as to intersect the first hanging wall in a plan view.
The cistern according to claim 7, wherein the second hanging wall and the third hanging wall are integrally formed with the upper wall. A hot water heating device comprising the system according to any one of claims 1 to 8.

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