JPS6122206B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water heater or the like that adjusts the temperature of the hot water by mixing a portion of the water supplied from the heat exchanger with the hot water supplied from the heat exchanger. An automatic valve, such as a ball, which closes a passage that bypasses a portion of the feed water when the cold water drain actuator for preventing freezing of the exchanger opens, and allows the water for preventing freezing to flow through the heat exchanger, The present invention relates to a structure that prevents abnormal noise from being generated when hot water hits the wall surface of a bypass passage during hot water supply.

Recently, there has been an increase in the number of water heaters that are installed outdoors due to safety and installation space considerations, but because they are installed outdoors, the water that remains inside the water heater can freeze during cold weather, causing damage to the equipment. There is a fear. Therefore, the low-temperature water drain actuator 2 shown in Fig. 1 is attached to the hot water outlet side of the heat exchanger 5, and when the outside air drops below freezing, the low-temperature water drain actuator 2 automatically opens and the water pressure regulator 1 and Exchanger 5, low temperature water drain operation device 2
A small amount of water is continued to flow in this order to prevent equipment from freezing and breaking. On the other hand, in this type of water heater, the water pressure regulator 1 is provided with a bypass passage 4 that bypasses the heat exchanger 5, and the opening area of this passage is adjusted by operating the temperature control knob 3, and heat is exchanged through the bypass passage 4. The temperature of the hot water is regulated by flowing water into the hot water supply side of the vessel 5 and mixing it with the hot water supply. Therefore, since the bypass passage 4 is normally open, when the outside temperature drops below freezing and the low-temperature water drain operation device 2 is activated, the circuit of the heat exchanger 5 is open compared to the bypass passage 4. Since the resistance is large, water flows to the bypass passage 4 side and does not flow to the heat exchanger 5 side, which causes the heat exchanger 5 to freeze and break. To prevent this, conventionally the water pressure regulator 1 was installed as shown in Figure 2.
A ball 6 is provided in the bypass passage downstream of the hot water temperature control knob 3, and when the low-temperature water drain operation device 2 is operating, a small amount of water flows, so it hits the valve seat 7 with its own weight, closing the passage and closing the bypass passage. Water should not flow to the passage 4 side, and all water should be transferred to the heat exchanger 5.
I was trying to let it flow to the side.

However, in the above structure, since the hot water temperature control knob 3 of the water pressure regulator 1 is opened and a water heater is normally used, water pressure is applied to the ball 6 through the bypass passage 4 when the amount of water is within the operating range of the water pressure regulator 1. As a result, the ball 6 rises as shown in FIG. 3, and water flows through the bypass passage 4. At this time, the ball 6 hits the wall of the bypass passage 4, causing an abnormal sound. In the figure, reference numeral 8 denotes a spring that prevents the ball 6 from coming out of the bypass passage 4.

The present invention solves the above-mentioned conventional drawbacks by improving the balls, springs, etc., and embodiments thereof will be described below with reference to the accompanying drawings. Note that the same parts as in FIGS. 1, 2, and 3 are given the same reference numerals, and the explanation will be omitted, and only the different parts will be explained.

In FIG. 4, a rubber or resin cushioning material 8 is coated around a metal ball 6, and a coil-shaped spring 9 is installed on the inside of the wall surface of the bypass passage 4 that contacts the ball 6 in the direction of water flow. Furthermore, in order to prevent the spring 9 and the ball 6 from jumping out of the bypass passage 4, a spring 10 is provided on the downstream side of the spring 9 as shown in FIG.
The tip of the ball 6 is bent and the ball 6 stops at the bent point.

In the above structure, when the outside temperature drops below freezing under normal usage conditions with the hot water temperature control knob 3 of the water pressure regulator 1 open, the low-temperature water drain actuator 2 operates and water begins to drain, but only a small amount of water flows. Also, since the ball 6 is metal and has a high specific gravity, the ball 6 is attached to the valve seat 7.
At this time, the bypass passage 4 is closed. Therefore, all the water that passes through the water pressure regulator 1 will flow through the heat exchanger 5, so even if the temperature drops below freezing, a small amount of water will continue to flow into the hot water supply circuit including the heat exchanger 5, freezing and destroying it. There will be nothing left to do.

Next, when using a normal water heater, the amount of water flowing through the water pressure regulator 1 increases, so the part of the water pressure regulator 1 on the hot water supply side of the heat exchanger 5 that communicates with the bypass passage 4 and the bypass passage part 4 A differential pressure is created between the valves and the water pressure applied to the bypass passage 4 causes the ball 6 to separate from the valve seat 7 and float up, stopping at the tip of the spring 10. As a result, a portion of the water passing through the water pressure regulator 1 is mixed into the hot water supply through the bypass passage 4.

At this time, the ball 6 hits the wall of the bypass passage 4, but since the ball 6 is coated with a cushioning material 8 and a spring 9 is provided inside the wall of the bypass passage 4 that contacts the ball 6. , the occurrence of abnormal noise due to contact between the ball 6 and metal is eliminated.

As described above, according to the present invention, the following effects can be obtained.

1. When the bypass passage provided in the water pressure regulator for regulating hot water temperature is open and the outside temperature drops and the low-temperature water drain operation device is activated, all the water flows through the heat exchanger, causing the heat exchanger to freeze. It will not be destroyed.

2. When using a water heater with the bypass passage for water temperature adjustment open, coat the ball that comes into contact with the wall of the bypass passage 4 with a cushioning material, and coat the inside of the wall of the bypass passage that comes into contact with the ball. Since a spring is provided, there will be no abnormal noise.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the water passage of a water heater using a conventional bypass mixing type water pressure regulator;
The figure is a cross-sectional view of the bypass mixing part of a conventional water pressure regulator with a ball, and Figure 3 is a cross-sectional view showing the ball floating up and coming into contact with the bypass passage when the same ordinary water heater is used. FIG. 4 is a sectional view of a bypass mixing section of a water pressure regulator in one embodiment of the present invention, and FIG. 5 is a plan view of a spring. 1...Water pressure regulator, 2...Low temperature water drain operation device,
3... Hot water temperature adjustment knob, 4... Bypass passage, 5
...Heat exchanger, 6...Ball, 7...Valve seat, 8...
...Buffer material, 9,10...Spring.

Claims (1)

[Claims] 1 A water pressure regulator installed in the water supply channel, a heat exchanger connected to the inlet side of this water pressure regulator, and a low-temperature water drain operation that is connected to the hot water supply side, which is the outlet side of this heat exchanger, and opens when the outside temperature is low. The water pressure regulator has a bypass passage for regulating hot water temperature that connects from the water supply side to the hot water supply side by bypassing the heat exchanger, and closes the bypass passage when the low temperature water drain operation device is opened. The water heater is equipped with a ball that opens a bypass passage during hot water supply, the ball is coated with a cushioning material, and a spring is provided on the inner surface of the bypass passage in contact with the ball.