JP2761882B2 - Outlet temperature control device for gas water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Object of the Invention) [Field of Industrial Application] The present invention relates to a tap water temperature control device used for a gas water heater.

[Conventional technology]

In a gas water heater, there is a case where it is desired to keep the tap water temperature constant regardless of the feed water temperature.

For this reason, in the conventional apparatus, the temperature of the incoming water is sensed by a temperature sensing member provided in the water inlet, and the valve body is operated by moving the advancing / retreating rod of the temperature sensing member to reduce the flow rate of the water inlet. The opening of the gas valve was increased or decreased by sensing the differential pressure of the flowing water amount by a diaphragm (Japanese Utility Model Laid-Open No. 62-56946).

[Problem to be solved by the invention]

However, in the conventional apparatus, since the tapping temperature was adjusted by the temperature-sensitive member without considering the current tapping amount, when the tapping amount is large, the tapping temperature is lower than the set tapping temperature. On the other hand, if the amount of incoming water is small, there is a possibility that the temperature of the hot water may become higher than the set water temperature,
There was a disadvantage that the temperature could not be adjusted correctly.

 An object of the present invention is to solve the above-mentioned disadvantages.

[Means for solving the problem]

In order to achieve the above object, in a gas hot water outlet temperature control apparatus of the present invention, a water pressure sensing chamber, an inlet channel, and a drain channel are provided in a casing, and the water pressure sensing chamber is divided into a primary chamber by a water pressure sensing member. And a secondary chamber. The primary chamber is connected to the water inlet and the secondary chamber is connected to the drain. The primary chamber is connected to the secondary chamber. In a tapping temperature control device of a gas water heater that bends the water pressure sensing member by a differential pressure of water pressure in the next chamber and increases or decreases the opening of a gas valve by this bending, a through hole is formed in a center portion of the water pressure sensing member. At the same time, an advance / retreat cylinder is fitted into the through hole, the primary chamber and the secondary chamber communicate with each other via the advance / retreat cylinder, and a fixed cylinder is protruded from the casing to detect the water pressure. Projecting into the room A temperature sensing member is fixed inside the fixed cylinder, and a movable cylinder is fitted inside the movable cylinder so as to be able to advance and retreat, and the fixed cylinder and the movable cylinder are arranged coaxially. Both diameters are made substantially the same, and an advancing / retreating member of the temperature-sensitive member is fixed to the moving cylinder so that the moving cylinder can be advanced / retracted by the operation of the temperature-sensitive member. An edge is formed in the shape of a hypotenuse through the side wall of these cylinders, and the edge of the fixed cylinder is fitted to the edge of the movable cylinder through a hypotenuse slit; Is covered by the advance / retreat cylinder.

The water pressure sensing chamber may be a diaphragm or a bellows diaphragm.

[Function of the invention]

In the hot water temperature control device of the gas water heater configured as described above, the fixed cylinder 15 and the movable cylinder 611 form a hypotenuse slit (zigzag slit), and the opening area of this slit is The degree of advance / retreat of the advance / retreat cylinder 3 is determined by the amount of incoming water, and is adjusted to be constant by the governor mechanism. Then, in the opening area of the slit S, a parallelogram BFED portion can be taken up as shown in FIG.

In the parallelogram BFED portion, when the water input temperature changes, the moving cylinder 611 moves in the axial direction by the operation of the temperature sensing member 6, and the height x of the parallelogram BFED portion changes. However, since the opening area of the slit S, and thus the area of the parallelogram ABCD, is set to be constant by the governor mechanism, the operation of the governor mechanism changes the base l of the parallelogram ABCD. With this change,
The reciprocating cylinder 3 and, consequently, the operating rod reciprocate, thereby increasing or decreasing the opening of the gas valve. That is, since the governor mechanism is configured by the slit opening area, the water flow rate, and the pressure before and after the diaphragm (differential pressure), the slit area becomes constant if the water flow rate, the inlet channel pressure, and the outlet channel pressure are the same. mechanism). Therefore, as shown in FIG. 6, when the movable cylinder 611 advances in the axial direction by the operation of the temperature sensing member 6, the parallelogram BFED portion (initial slit area S = BFED = α × x × l)
(Α: constant)) is a parallelogram B′F′E′D ′ part (slit area S ′ = B′F′E′D ′ = α ×
x ′ × l ′ (α: constant)), and the height x changes to the height x ′. However, since the opening area of the slit S, and thus the area of the parallelogram ABCD, is set to be constant by the governor mechanism, the base 1 of the parallelogram ABCD portion is also parallelized by the operation of the governor mechanism. As a result of changing to the base l 'of the quadrilateral B'F'E'D',
Along with this change, the advancing / retreating cylinder 3 and, consequently, the operating rod are retracted, and the opening degree of the gas valve is increased or decreased. Therefore, the height of the parallelogram is forcibly changed from x to x 'by the temperature sensing member.
When the governor mechanism operates, the base l of the parallelogram
Increases or decreases to l ', the gas amount changes, and the incoming water temperature can be corrected to stabilize the outlet water temperature.

By the way, since the opening area of the slit varies depending on the amount of incoming water, the increase / decrease of the opening degree of the gas valve due to the change of the incoming water temperature varies depending on the amount of incoming water.

[Explanation of Example]

An embodiment of the present invention will be described below with reference to FIGS.

 1 to 4 show a first embodiment.

1 to 3, reference numeral 1 denotes a casing of the tap water temperature control device W, which has a water inlet channel 11 and a drain channel 12. One end of the casing of the water supply channel 11 forms a water inlet 111, and one end of the casing of the drainage channel 12 forms a drainage port 121. Reference numeral 13 denotes a diaphragm chamber (corresponding to the “water pressure sensing chamber” of the present invention), which is formed in the casing 1.
Reference numeral 2 denotes a diaphragm (corresponding to the “water pressure sensing member” of the present invention), which is installed in the diaphragm chamber 13. The diaphragm 2 divides the diaphragm chamber 13 into a primary chamber 131 and a secondary chamber 132. Here, the primary room
131 communicates with the inlet channel 11 and the secondary chamber 132
Communicate with Reference numeral 21 denotes a through hole, which is formed at the center of the diaphragm 2. The reciprocating cylinder 3 is fitted in the through hole 21 in a liquid-tight manner. Therefore, the advancing and retreating cylinder 3 can move in the axial direction by bending of the diaphragm 2, and the primary chamber 131 and the secondary chamber 1 can be moved through the advancing and retreating cylinder 3.
Communicates with 32. Reference numeral 4 denotes an operating rod, which is fixed to the distal end opening of the advance / retreat cylinder 3. The operating rod 4 extends in the reciprocating direction of the reciprocating cylinder 3 and protrudes outside the casing 1.

Reference numeral 15 denotes a fixed cylinder which is screwed to the casing 1. The fixed cylinder 15 faces the advance / retreat cylinder 3 in a state of protruding into the primary chamber 131. The leading edge (the right edge in FIG. 1) of the fixed cylinder 15 is formed in a so-called zigzag shape in which concave portions and convex portions are alternately connected (see FIG. 3A). Reference numeral 5 denotes a mounting seat, which is screwed inside the fixed cylinder 15. The temperature sensing member 6 is fixed to the casing 1 via the mounting seat 5. Numeral 61 denotes an advancing / retreating member of the temperature-sensitive member 6, which moves in the axial direction when the temperature-sensitive member 6 detects a temperature change. Reference numeral 611 denotes a moving cylinder,
The nut 61 is fixed to the advancing / retreating member 61. This moving cylinder 611
Are disposed coaxially with the fixed cylinder 15 and have the same diameter as that of the fixed cylinder 15. The leading edge (the left edge in FIG. 1) of the moving cylinder 611 is formed in a so-called zigzag shape in which concave portions and convex portions are alternately continuous (see FIG. 3B). The convex and concave portions at the zigzag end of the moving cylinder 611 are fitted to the concave and convex portions at the zigzag end of the fixed cylinder 15 via zigzag slits S (see FIGS. 2 and 4). .

Reference numeral 612 denotes a compression spring, which is hung between the fixed cylinder 15 and the advance / retreat member 61. This compression spring 61
Via 2, the reciprocating member 61 extended by the temperature sensing member 6 returns to the original state.

Next, on the right side of FIG. 1, G is a gas burner of a gas water heater, and Y is a gas mixture (raw gas +
It is a ratio control valve device for supplying primary air) and secondary air. In the ratio control valve device B, 81 is a secondary air control valve, 82 is a primary air control valve, and 83 is a raw gas control valve. These valves 81, 82, 83 are connected by a single coaxial operating rod 9, and the opening degree is increased or decreased by the axial movement of the operating rod 9. By the way, since this operating rod 9 and the operating rod 4 of the advancing / retreating cylinder 3 (in the tapping temperature adjusting device A) are coaxially connected, the advancing / retreating is performed with the advancing / retreating of the advancing / retreating cylinder 3, and thus the valves 81, 82. , 83 open and close.

In such a device W, when the amount of incoming water increases, the diaphragm 2 bends rightward (FIG. 1), so that the reciprocating cylinder 3 moves rightward, and the operating rod 4 and, consequently, the operating rod 9 move rightward. And the secondary air control valve 81 of the ratio control valve device Y,
The opening degree of the primary air control valve 82 and the raw gas control valve 83 is increased. Then, the amount of air-fuel mixture and the amount of secondary air flowing through the gas burner G increase, and the amount of heat generated by combustion increases.

On the other hand, when the amount of incoming water decreases, the diaphragm 2 flexes to the left (FIG. 1), so that the reciprocating cylinder 3 moves to the left, and the operating rod 4 and, consequently, the operating rod 9 move to the left to control the ratio control. The opening degree of the secondary air control valve 81, the primary air control valve 82, and the raw gas control valve 83 of the valve device Y is reduced. Then, the amount of air-fuel mixture and the amount of secondary air flowing through the gas burner G decrease, and the amount of heat generated by combustion decreases.

 Next, the case where the incoming water temperature changes will be described.

In this tapping temperature control device, the slit S is formed by the fixed cylinder 15 and the movable cylinder 611, and the opening area thereof is determined by the degree of the advance / retreat of the advance / retreat cylinder 3, that is, the amount of incoming water. In the opening area of this slit S, a parallelogram BFED part can be taken up as shown in FIG.

In this parallelogram BFED section, when the incoming water temperature rises, the advancing / retreating member 61 of the temperature sensing member 6 is pushed out.
611 is extruded in the axial direction, the height x of the parallelogram BFED part
Becomes larger. At this time, since the opening area of the slit, and consequently, the area of the parallelogram BFED portion is constant, the base l of the parallelogram BFED portion becomes smaller, so that the reciprocating cylinder 3 and thus the operating rod 4 retreat to the left. The opening degree of the secondary air control valve 81, the primary air control valve 82 and the raw gas control valve 83 of the ratio control valve device Y is reduced. Then, the amount of air-fuel mixture and the amount of secondary air flowing through the gas burner G decrease, and the amount of heat generated by combustion decreases.

On the other hand, when the incoming water temperature falls, the advancing / retreating member 61 of the temperature-sensitive member 6 is moved.
Is pushed by the return spring 612, so that the moving cylinder 611 is moved.
Is retracted to the left in the axial direction, and the height x of the parallelogram BFED part
Becomes smaller. At this time, since the opening area of the slit, that is, the area of the parallelogram BFED portion is constant, the base l of the parallelogram BFED portion becomes large. As a result, the reciprocating cylinder 3 and thus the operating rod 4 extend rightward. The opening degree of the secondary air control valve 81, the primary air control valve 82 and the raw gas control valve 83 of the ratio control valve device Y is increased. Then, the amount of air-fuel mixture and the amount of secondary air flowing through the gas burner G decrease, and the amount of heat generated by combustion increases.

FIG. 5 shows a second embodiment of the tapping temperature control device W. In this embodiment, reference numeral 14 denotes a guide cylinder, which is formed on the casing 1. The guide cylinder 14 guides the advance / retreat of the advance / retreat cylinder 3. Reference numeral 17 denotes a communication hole.
Is formed. The communication hole 17 is provided between the water inlet channel 11 and the primary chamber 13.
Communicates with 1.

In the apparatus of the second embodiment, when the amount of incoming water increases, the diaphragm 2 bends to the left (FIG. 5), so that the advance / retreat member 3 moves to the left, and the operating rod 4 and thus the operating rod 9 move to the left. It moves to increase the opening of the secondary air control valve 81, primary air control valve 82 and raw gas control valve 83 of the ratio control valve device Y.

On the other hand, when the amount of incoming water decreases, the diaphragm 2 bends rightward (FIG. 5), so that the reciprocating cylinder 3 moves rightward, and the operating rod 4 and, consequently, the operating rod 9 move rightward, and the ratio control valve The opening degree of the secondary air control valve 81, the primary air control valve 82 and the raw gas control valve 83 of the device Y is reduced.

In addition, the secondary air control valve 81 and the primary air control valve 82 with respect to the change of the incoming water temperature in the ratio control valve device Y of the second embodiment.
The operation of the raw gas control valve 83 is substantially the same as that of the first embodiment.

(Effect of the Invention) In the tap water temperature control device for a gas water heater according to the present invention, a water pressure sensing chamber, an inlet channel, and a drain channel are provided in a casing, and the water pressure sensing chamber is divided into a primary chamber and a secondary chamber by a water pressure sensing member. And the primary chamber is connected to the water inlet passage and the secondary chamber is connected to the drain passage.The primary chamber and the secondary chamber are connected to each other. In a tapping temperature control device for a gas water heater, wherein the water pressure sensing member is bent by a pressure difference of water pressure and the degree of opening of a gas valve is increased or decreased by the bending, a through hole is formed in a center portion of the water pressure sensing member, and A reciprocating cylinder is fitted into the hole, the primary chamber and the secondary chamber are communicated with each other through the reciprocating cylinder, and a fixed cylinder is protruded from the casing, and the fixed cylinder protrudes into the water pressure sensing chamber. And said advance and retreat A temperature-sensitive member is fixed inside the fixed cylinder, and a movable cylinder is fitted inside the movable cylinder so as to be able to advance and retreat, and the fixed cylinder and the movable cylinder are arranged coaxially and their diameters are adjusted. Advancing and retreating members of the temperature-sensitive member are fixed to the moving cylinder so that the moving cylinder can be advanced and retracted by the operation of the temperature-sensitive member, and a contact edge between the fixed cylinder and the moving cylinder is formed by these cylinders. Formed on the oblique side through the side wall of the movable cylinder, the edge of the fixed cylinder is fitted to the edge of the movable cylinder via a hypotenuse slit, and the movable cylinder end of this slit is moved by the advance / retreat cylinder. Covered.

For this reason, in the tapping temperature control device of this gas water heater, a hypotenuse-shaped slit (zigzag-shaped slit) is formed by the fixed cylinder 15 and the movable cylinder 611, and the opening area of this slit is 3 is determined by the degree of advance and retreat, that is, the amount of incoming water, and is adjusted to be constant by the governor mechanism. Then, in the opening area of the slit S, a parallelogram BFED portion can be taken up as shown in FIG.

In the parallelogram BFED portion, when the water input temperature changes, the moving cylinder 611 moves in the axial direction by the operation of the temperature sensing member 6, and the height x of the parallelogram BFED portion changes. However, since the opening area of the slit S, and thus the area of the parallelogram ABCD, is set to be constant by the governor mechanism, the operation of the governor mechanism changes the base l of the parallelogram ABCD. With this change,
The reciprocating cylinder 3 and, consequently, the operating rod reciprocate, thereby increasing or decreasing the opening of the gas valve. That is, since the governor mechanism is constituted by the slit opening area, the water flow rate, and the pressure before and after the diaphragm (differential pressure), the slit area becomes constant if the water flow rate and the inlet and outlet channel pressures are the same. mechanism). Therefore, as shown in FIG. 6, when the movable cylinder 611 advances in the axial direction by the operation of the temperature sensing member 6, the parallelogram BFED portion (initial slit area S = BFED = α × x × l)
(Α: constant)) is a parallelogram B′F′E′D ′ part (slit area S ′ = B′F′E′D ′ = α ×
x ′ × l ′ (α: constant)), and the height x changes to the height x ′. However, since the opening area of the slit S, and thus the area of the parallelogram ABCD, is set to be constant by the governor mechanism, the bottom side 1 of the parallelogram ABCD part is also parallelized by the operation of the governor mechanism. As a result of changing to the base l 'of the quadrilateral B'F'E'D',
Along with this change, the advancing / retreating cylinder 3 and, consequently, the operating rod are retracted, and the opening degree of the gas valve is increased or decreased. Therefore, the height of the parallelogram is forcibly changed from x to x 'by the temperature sensing member.
When the governor mechanism operates, the base l of the parallelogram
Increases or decreases to l ', the gas amount changes, and the incoming water temperature can be corrected to stabilize the outlet water temperature.

By the way, since the opening area of the slit varies depending on the amount of incoming water, the increase / decrease of the opening degree of the gas valve due to the change of the incoming water temperature varies depending on the amount of incoming water.

Therefore, if the tap water temperature control device of the gas water heater is used, correct temperature control can be performed regardless of the amount of flowing water.

[Brief description of the drawings]

1 to 5 show a first embodiment of a tap water temperature control device for a gas water heater according to the present invention. FIG. 1 is a sectional view, and FIG. FIG. 3 (a) is a perspective view of a fixed barrel, FIG. 3 (b) is a perspective view of a movable barrel, and FIG. 4 is a perspective view of these barrels illustrating the relationship between the fixed barrel, the movable barrel, and the forward / backward barrel. FIG. 5 is a view of a second embodiment corresponding to FIG. FIG. 6 is an expanded view of these drawings illustrating the relationship between the fixed cylinder, the movable cylinder, and the advance / retreat cylinder when the movable cylinder 611 is advanced in the axial direction by the operation of the temperature sensing member. 1 ... Casing 11 ... Inlet channel (flow channel) 12 ... Drainage channel 13 ... Diaphragm room (water pressure sensing room) 131 ... Primary room 132 ... Secondary room 15 ... Fixed cylinder 2 ... Diaphragm (water pressure) Sensing member) 21 Through hole 3 Reciprocating cylinder 6 Temperature sensing member 61 Reciprocating member 611 Moving cylinder 83 Raw gas control valve (gas valve) S Slit S W apparatus

Claims (3)

(57) [Claims] 1. A water pressure sensing chamber, a water inlet and a water drain are provided in a casing, the water pressure sensing chamber is partitioned into a primary chamber and a secondary chamber by a water pressure sensing member, and the water inlet is connected to the primary chamber. The drainage passage is communicated with the secondary chamber, and the primary chamber and the secondary chamber are communicated with each other, and the hydraulic pressure sensing member is bent by a pressure difference between the primary chamber and the secondary chamber. In the tapping temperature control device of the gas water heater for increasing or decreasing the opening degree of the gas valve, a through-hole is formed in the center of the water pressure sensing member, and an advance / retreat cylinder is fitted into the through-hole. The primary chamber and the secondary chamber are communicated with each other, and a fixed cylinder is protruded from the casing. The fixed cylinder projects toward the water pressure sensing chamber and faces the advance / retreat cylinder. When fixing the temperature-sensitive member In addition, a moving cylinder is fitted inside the moving cylinder so as to be able to move forward and backward, and the fixed cylinder and the moving cylinder are arranged coaxially and have substantially the same diameter. The movable cylinder can be advanced and retracted by the operation of the temperature-sensitive member, and a contact edge between the fixed cylinder and the movable cylinder is formed in an oblique shape via a side wall of these cylinders. The outlet temperature of the gas water heater is adjusted by fitting an edge of the moving cylinder to an edge of the moving cylinder via a hypotenuse slit, and covering the moving cylinder end of the slit with the advance / retreat cylinder. apparatus. 2. A tapping temperature control device for a gas water heater according to claim 1, wherein said water pressure sensing member is a diaphragm. 3. A tap water temperature control device for a gas water heater according to claim 1, wherein said water pressure sensing member is a bellows flam.