JPH02607Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a bypass mixing type gas proportional control water heater.

[Conventional technology]

Mixing type gas water heaters mix hot water and cold water to obtain hot water at an appropriate temperature, but because the temperature of the mixed water is always kept high, there is no condensation on the heat exchanger, and no drainage occurs. It has the characteristic that its durability is significantly improved as there is no corrosion due to However, the proportional control type has the disadvantage that it is necessary to adjust the amount of bypass, and that sufficient temperature control cannot be obtained depending on the adjustment.

In addition, in a proportional control system and not a bypass system, there is a problem that drainage occurs in a low temperature range and lacks durability.

[Problem that the invention attempts to solve]

This idea automatically controls the ratio of the amount of water flowing to the heat exchanger (the amount of hot water supplied to the mixer) and the amount of water passing through the bypass passage (the amount of cold water flowing to the mixer) in conjunction with the gas proportional control operation. Not only can you always get hot water at the right temperature, but you can also adjust the temperature by changing these ratios.
The object of the present invention is to provide a mixing type gas water heater that eliminates the above-mentioned conventional drawbacks.

[Means for solving problems]

This idea connects a hydraulic automatic gas valve V 1 installed in the gas passage 2 to the main burner _{1 and a balance valve V 2 installed} in the bench lily part 4 of the water supply channel 3 to the heat exchanger D via a diaphragm 5. In the gas proportional control water heater, a bypass valve V 3 is provided coaxially with the balance valve V ₂ to bypass a part of the water volume of the water supply channel ₃ to the mixer E, and the bypass valve V ₃ is This is characterized in that the bypass passage 6 to the mixer E is equipped so that its relationship with the valve seat 7 can be changed continuously.

[Effect]

Since this device has the above structure, the hydraulic automatic gas valve V ₁ and the balance valve V ₂ are actuated via the diaphragm 5 by the differential pressure generated according to the amount of water flowing to the heat exchanger D passing through the bench lily portion 4. The amount of gas supplied to the main burner 1 is automatically controlled in proportion to the amount of water flowing to the heat exchanger D, and a constant high temperature water is always supplied to the mixer E.
In addition, the bypass valve V ₃ also controls the amount of water flowing through the bypass passage 6 in conjunction with the proportional control operation, and automatically adjusts the amount of cold water supplied to the mixer E according to the amount of hot water supplied to the mixer E. Since the mixing ratio is always kept constant, hot water at a constant temperature can be obtained at all times. In addition, the bypass valve
By continuously changing the relationship between V ₃ and its valve seat 7 and widening or narrowing the opening of bypass valve V ₃ , the ratio of the amount of water flowing to heat exchanger D and the amount of water flowing through bypass passage 6 will change. The temperature of the hot water can also be adjusted freely.

〔Example〕

An embodiment of the mixing type gas water heater according to this invention will be described below with reference to the drawings.

In the drawings, 1 is the main burner, 2 is the main burner 1
gas passage to the main burner 1, V ₁ is the gas passage 2 to the main burner 1
It is a hydraulic automatic gas valve installed in a valve chamber 8 provided in a valve chamber 8 facing its valve seat 9, and is biased in the closing direction by a return spring 10, and in a diaphragm chamber 11 provided in a water supply channel 3, which will be described later. The diaphragm 5 is connected to the secondary chamber 11b side of the diaphragm 5 via a valve shaft 12. D is a heat exchanger, 3 is a water supply channel to the heat exchanger D, a diaphragm chamber 11 is provided in the middle thereof, a diaphragm 5 is stretched over the diaphragm chamber 11, and the diaphragm chamber 11 is connected to the primary chamber 11a by the diaphragm 5. A constant flow valve V ₄ is provided on the upstream side of the primary chamber 11a, and a bench lily section 4 is provided on the downstream side, and the bench lily section 4 is connected to the secondary chamber 11b of the diaphragm chamber 11. They are communicated via a communication path 13. V ₂ is a balance valve equipped on the bench lily section 4, which is attached to the valve shaft 14 integral with the diaphragm 5 via a support spring 15, and automatically adjusts the amount of water passing through the bench lily section 4. Reference numeral 6 denotes a bypass passage which branches from the primary chamber 11a of the diaphragm chamber 11 and bypasses a portion of the water amount of the water supply passage 3 to the mixer E, and is used to supply cold water for mixing to the mixer E, which will be described later. V ₃ is a bypass valve installed in a valve chamber 16 provided in the bypass passage 6, and is fixed to the tip of a valve shaft 17 that is integrally provided with the same axis as the balance valve V ₂ , and is connected to the water pressure automatic gas valve.
V ₁ and the balance valve V ₂ are interlocked via the diaphragm 5 to automatically adjust the amount of water flowing through the bypass passage 6. 7 is the valve seat of the bypass valve _V3 , which is fitted into the sliding part 18 provided on the valve housing C so that it can move forward and backward, and which is screwed into one side of the valve housing C while keeping the same axis as the valve seat 7. The temperature control shaft 1 is connected to the tip of the shaft 19 via a support plate 21 having a water passage hole 20.
The temperature control knob 22 provided at the base end of the bypass valve V 3 is rotated to move the valve seat 7 forward and backward, thereby making it possible to continuously change the relationship between the bypass valve V ₃ and its valve seat 7. Reference numeral E denotes a mixer, to which the bypass passage 6 and the hot water supply pipe 23 from the heat exchanger D are connected. This is what allows the hot water to come out. In the embodiment, the valve seat 7 of the bypass valve V ₃ is a movable seat, and the relationship between the bypass valve V ₃ and its valve seat 7 can be continuously changed by moving the movable seat forward and backward with the temperature control shaft. However, the relationship between the bypass valve V ₃ and its valve seat 7 may be made continuously variable using any other arbitrary means, but the implementation is free. In the figure, 25 is the inner shell of the water heater, and 26 is a gas nozzle.

Therefore, the water pressure automatic gas valve V ₁ and the balance valve V _{2 are controlled via the diaphragm 5 by the differential pressure generated in the bench lily portion 4 according to the amount of water passing through the bench lily portion 4 which is automatically adjusted by the balance valve V 2 .} A bypass valve that is activated to automatically control the amount of gas supplied to the main burner 1 in proportion to the amount of water flowing to the heat exchanger D, and sends hot water at a constant temperature to the mixer E, and is linked to the proportional control. Automatically controlled by V ₃ , a constant amount of cold water is supplied from the bypass passage 6 to the mixer E, so a constant mixing ratio is always maintained and hot water at a predetermined temperature is always obtained _. By changing the relationship with the valve seat 7 to change the amount of water flowing through the bypass passage 6 and changing the mixing ratio, the temperature of the hot water can be freely controlled. FIG. 3 shows the relationship between the valve lift H and the water supply amount and the outlet temperature.
Also, in Figure 4, if A is the heat exchange water flow rate and B is the bypass rate, then if the ratio of A/B is kept constant, hot water at an appropriate temperature can always be obtained, and if the ratio of A/B is varied, the mixing temperature can be adjusted. It is something that can be changed. The passing temperature A of the heat exchanger is always higher than the mixing temperature V which is the tapping temperature.

[Effect of idea]

As explained above, this invention is based on the bypass mixing type gas proportional control water heater, in which the balance valve V ₂ and the coaxial bypass valve V ₃ are connected to the mixer B.
Since the bypass passage 6 is equipped to change the distance between the valve seat 7 and the valve seat 7, the amount of water flowing through the bypass passage 6 is automatically controlled according to the amount of water flowing to the heat exchanger D, and hot water is always kept at a constant temperature. of the bypass valve V ₃ and its valve seat 7.
It is also possible to control the hot water temperature by changing the time.
In addition, since the temperature passing through the heat exchanger is always higher than the tap water temperature, the generation of drainage is prevented, and there is no corrosion due to drainage, so its durability is significantly improved.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view showing an embodiment of the mixing type gas water heater according to this invention, Fig. 2 is an enlarged sectional view of only the main parts, and Figs. 3 and 4 show an example of the mixing ratio. This is the graph shown. 1... Main burner, 2... Gas passage, V ₁ ... Water pressure automatic gas valve, D... Heat exchanger, 3... Water supply channel,
4... Bench lily section, V ₂ ... Balance valve, 5...
...Diaphragm, V ₃ ...Bypass valve, E...Mixer, 6...Bypass passage, 7...Valve seat.

Claims (1)

[Scope of utility model registration request] A gas proportioning system in which a hydraulic automatic gas valve V ₁ installed in the gas passage 2 to the main burner 1 and a balance valve V ₂ installed in the bench lily part 4 of the water supply channel 3 to the heat exchanger D are connected via a diaphragm 5. In the control type water heater, a bypass valve V 3 is provided coaxially with the balance valve V ₂ to bypass a part of the water volume of the water supply channel 3 to the mixer E, and the bypass valve V ₃ is used to bypass the water volume of the water supply channel ₃ to the mixer E. A mixing type gas water heater characterized in that a bypass passage 6 is equipped with a valve seat 7 so that its relationship with the valve seat 7 can be changed.