JPH0316537A - Hot water supply device for extractor - Google Patents

Abstract

PURPOSE:To extract a small amount of hot water in accordance with the am ount of feed water to a tank and to safely feed hot water with a simple con struction and at low cost by absorbing the water of volume in response to the expansion of water at the water feed port of a water conduit when the water in a tank is expanded by heating. CONSTITUTION:Water is supplied to a lower part of a closed tank 1 having a heating member 2 for heating water. Hot water is supplied to an extractor 9 by a water conduit 12 having a hot water feed port at an upper part of the tank 1. The water conduit 12 is provided with an upper water feed port 12a and lower water feed port 12b. The upper water feed port 12a is usually closed by means of a valve spring 16 and a value 13 provided at one end of a pivoted connecting plate 15. At the other end of the connecting plate 15, a spring 17 made of shape memory alloy is provided. When the temperature of water in the tank rises to reach a preset temperature, the valve 13 is released from the upper water feed port 12a with the energizing force of the spring 17 against the energizing force of the valve spring 16. As a result, a small amount of hot water can be extracted in accordance with the amount of feed water to a tank 5.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a water heater for coffee makers and other brewing machines.

2. Description of the Related Art An example of a conventional extractor will be explained with reference to FIG. Reference numeral 1 denotes a container, and a heating element 2 is attached to the lower peripheral edge of the container 1, and a temperature regulator is provided outside the bottom surface. A lid 4 is provided above the container l in a sealed state. A tank 5 is provided above M4, and an opening 5a is provided at the bottom of the tank 5. Reference numeral 6 denotes a water supply pipe, one end of which is attached to the opening 5a, and the other end passes through the opening 4a of the lid 4 and extends downward into the container 1. Another opening 4b provided in the lid 4 is
It penetrates through an air cylinder 7 that opens above the tank 5. An opening 4c further provided in the lid 4 is provided as a through hole for a water guide pipe 8, and one end of the water guide pipe 8 is connected to a suction hole 8a located above the container mouth, and the water guide pipe 8 is connected at one end to a suction hole 8a located above the container mouth.
It is bent into a letter shape and the other end serves as a discharge port 8b.Below the discharge port 8b is a basket 9 serving as an extraction device for storing coffee powder, etc., and below the basket 9 is a decanter 1o for storing coffee liquid etc. It is set up. The eye is a lid, which is provided above the tank 5 and has a water inlet I1a for putting water into it.

In the above configuration, when water is first poured from the water supply port 11a, water enters the container 1 from the opening 5a of the tank 5 via the water supply pipe 6. When the water level in the container 1 rises and the water is supplied above the water guide pipe 8, the water in the container mouth is discharged through the water guide pipe 8 from the discharge port 8b. When the water is drained and the water level drops to the same level as the inlet 8a, the container 1
Since air is simultaneously introduced into the interior by the air cylinder 7, air also enters the water guide pipe 8 from the suction port 8a, and the siphon principle does not work in the water guide pipe 8, and drainage stops. In this state, when electricity is passed through the heating element 2 to heat it, the water in the container 1 is heated. When the water temperature rises and reaches the setting temperature of the temperature regulator 3, the temperature regulator 3 operates to stop supplying electricity to the heating element 2. After that, coffee powder is placed in the basket 9 and water is supplied again from the water supply port Ila, and the heated hot water in the container l is discharged from the discharge port 8b via the water guide pipe 8, and the \basket 9 The coffee liquid is poured onto the coffee grounds in the decanter 10 and drips into the decanter 10.

Problems to be Solved by the Invention However, in the conventional brewing machine as described above, the volume expands as the water is heated, so the amount of water discharged is greater than the amount of water that needs to be refilled, resulting in a thinner coffee liquid, etc. If you use a coffee cup instead of a decanter, there are problems such as the cup overflowing and causing burns. Particularly when boiling water for the first time, all the water in the container was close to room temperature, so the amount of water increased due to expansion of the body parts, making the process unsuitable for brewing a small amount of coffee.

The purpose of the present invention is to provide a water heater that, when water in a container expands due to heating, absorbs the volume corresponding to this expansion at the water supply port of the water guide pipe, making it possible to extract a small amount of water depending on the amount of water supplied to the tank. This is what we are trying to provide.

Means for Solving the Problems In order to achieve the above objects, the present invention includes a sealed container having a heating element that heats water, a water supply pipe that supplies water to the lower part of the container, and a hot water supply pipe installed in the upper part of the container. The water guide pipe is provided with an upper inlet and a lower inlet, and the upper inlet is provided with a valve spring provided at one end of a pivotally supported connecting plate. A shape memory alloy spring is provided at the other end of the connecting plate, and when the water temperature in the container rises and reaches the set temperature, the valve spring is biased by the biasing force of the shape memory alloy spring. The hot water supply device for the extractor is provided in such a way that the valve opens from the upper suction port against the force.

If water is supplied when the working container is empty and the water level rises,
The upper intake port of the water guide pipe is always closed by a valve biased by a valve spring, so water enters the water guide pipe from the lower intake port and is discharged from the discharge port. When the water level drops due to drainage and reaches the same position as the lower intake port of the water guide pipe, air enters from the lower intake port, and the siphon principle no longer works in the water guide pipe, stopping drainage. When the water in the container is heated by the heating element and reaches a temperature higher than the operation setting temperature of the shape memory alloy spring, the biasing force of the shape memory alloy spring operates against the biasing force of the valve spring, and the valve closes to the -E inlet. be freed from.

Did the difference between the upper and lower intake ports expand? Hot water is not supplied from the water pipe.

Therefore, only the amount injected into the tank is supplied from the water pipe to lg.
You will be able to do J.

Example The diagrams shown as examples will be explained below.

The example of the extractor is almost the same as the conventional example shown in FIG.
II and lla each indicate the same component. In addition to this configuration, in this embodiment, the upper suction port 12a and the lower suction port are used as the suction ports of the water guide pipe l2! 2b are provided,
Fold into an inverted U shape! A discharge port 12c is provided at the other end. Reference numeral 13 denotes a valve, which is attached to one end of a connecting plate 15 that is pivotally supported by a shaft l4, so that the upper suction port 12a is always closed by the biasing force of a valve spring 16. Reference numeral 17 denotes a shape memory alloy spring, which is provided at the other end of the connecting plate 15 and positioned below the lower suction port 12b. They are designed to work together.

This shape memory alloy spring 17 has an operating temperature set between the room temperature of water and the temperature at which water can be extracted.
7 operates, the biasing force of the spring is equal to the force of the valve spring 16
The valve 13 is set to operate against the urging force of the upper suction port 12a, and the valve 13 is opened from the upper suction port 12a.

In the above configuration, when water is first supplied from the water supply port 11a to the tank 5 while the interior of the container 1 is empty, the water level in the container 1 rises from the water supply pipe 6. At this time, since the water temperature of the shape memory alloy spring 17 is below the operating setting temperature, the spring biasing force is small, and the valve I3 closes the upper suction port 12a by the biasing force of the valve spring 16. When the water level in the container 1 rises and reaches the top of the water guide pipe 12, the water guide pipe! It is discharged from the second discharge port 12c. The water level drops due to drainage, and the lower intake port of the water guide pipe 12! When the water level reaches the same level as 2b, air is simultaneously flowing into the container 1 through the air cylinder 7, so the lower intake port +2b also enters the water guide pipe 12.
As more air enters, the siphon principle stops working and drainage stops. In this state, when the heating element 2 starts to be energized, the container l
The water inside is heated, and as the water temperature rises, the water level rises due to the slight expansion of the body. When the water temperature reaches the operating temperature of the shape memory alloy spring 17, a spring force is generated and the valve spring! Since it operates against the spring biasing force of 6, the connecting plate 15 which is pivotally supported
The valve 13 opens the upper suction port 12a via the upper suction port 12a. When the water temperature further rises and reaches the set temperature of the temperature regulator 3, the temperature regulator 3 operates to stop the power supply to the heating element 2. The water temperature at this time is set to a temperature that allows extraction, and the position of the upper intake port 12a of the water guide pipe 12 is set to match this water level. After this, coffee powder is placed in the basket 9 and set, and water is supplied again from the water supply port 11a, and the supplied amount enters the container 1 through the water supply pipe 6, and the container! The water level inside rises, and hot water is discharged from the discharge port 12c of the water guide pipe 12.

When the water level falls, the upper suction port 12a of the water guide pipe 12 is now open, so air enters from the upper suction port 12a and drainage stops. In other words, the volume expansion caused by the rise in water temperature is offset by the heights of the upper suction port 12a and the lower suction port +2b, so that the amount of supplied water becomes equal to the amount of discharged water. As a result, even when brewing with a small number of mice, the amount of water to be discharged is determined by the amount of water supplied, making it possible to extract coffee with a constant concentration.

Effects of the Invention As described above, the present invention provides two upper and lower eyes at the inlet of the water guide pipe that discharges heated water onto the extraction device, and the upper inlet has a valve and a valve spring provided through a connecting plate. The inlet was kept closed at all times, allowing water at a level exceeding the lower eye entrance to be drained out. When the water temperature in the container increases due to heating, the shape memory alloy spring operates due to the rise in water temperature, and the upper intake port of the water guide pipe opens, allowing water to flow between the lower intake port and the upper intake port. It was designed to absorb the volume expansion. Therefore, the amount of water supplied from the water inlet can be made equal to the amount of hot water discharged, and even when extracting a small amount of coffee,
You can now set your preferred density. Moreover, since the discharge amount is equal to the water supply amount, the user can easily judge the amount, and there is no risk of burns or spillage of the extract when dispensing.It is safe, has a simple configuration, and can be supplied at low cost. big.

[Brief explanation of drawings]

Figure 1 is a sectional view showing one embodiment of the extractor of the present invention, Figure 2
The figure is a mtt perspective view of the same, and FIG. 3 is a sectional view showing a conventional extractor.

Claims (1)

[Claims] (1) A sealed container having a heating element that heats water;
The container is equipped with a water supply pipe that supplies water to the lower part of the container, and a water guide pipe that has a hot water inlet at the top of the container and supplies the water to the extraction device, and the water guide pipe has an upper inlet and a lower inlet. The upper suction port is always closed by a valve spring and a valve provided at one end of a pivotally supported connecting plate, and a shape memory alloy spring is provided at the other end of the connecting plate, so that the water temperature in the container rises and is set. A hot water supply device for an extractor, characterized in that the valve is opened from the upper suction port by the urging force of the shape memory alloy spring against the urging force of the valve spring when the temperature reaches the temperature.