JPH0225021Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electric valve that is installed and used in a hot water circulation circuit of a radiator for a central heating system, a radiator for air conditioning, a bus heater, or the like.

Conventionally, hot water circulation circuits such as radiators for central heating systems are equipped with an ON/OFF switch for the radiator to prevent hot water from circulating inside the radiator when the radiator is not in use. An electric valve with a built-in wax thermoelement that operates in conjunction with is installed.

The electric valve (hereinafter referred to as "electric valve") incorporating this wax thermoelement heats and expands the wax thermoelement 02 with an electric heater 01 as shown in FIG. 1, and this expansion action causes the valve 03 to
The valve 03 is opened, and the valve 03 is closed by a contraction action based on the heating stop.

The conventional electric valve usually has an opening time of 1 to 2 minutes;
Since a closing time of 5 to 10 minutes is required, there is a particular desire to shorten the closing time. this is,
This is because the longer the closing time, the more wasteful hot water circulates through the radiator, resulting in more heat loss, and the room temperature rises more than appropriate due to excessive heat radiation.

Therefore, as a way to improve this drawback, it is possible to adopt solenoid valves that operate in tandem with each other instantaneously, but solenoid valves are expensive, and because they open and close rapidly, they are prone to water hammer. The disadvantage is that it makes a lot of noise.

From this point of view, it is an object of the present invention to propose a novel configuration for the above-mentioned electric valve, which can shorten the closing time to at least the same extent as the opening time.

The structure of the present invention will be explained below: an electric heater, a wax thermoelement that thermally expands due to the heat generated by the electric heater, and a valve that opens due to the expansion action of the wax thermoelement and closes due to the contraction action of the wax thermoelement. In this motor-operated valve, two valve seats are formed, both facing upstream with respect to the flow path, and an opening valve that acts in the opening direction when the wax thermoelement expands is arranged on one of the valve seats. A closing valve that acts in the closing direction when the wax thermoelement expands is placed on the other valve seat, and a timer is inserted into the electric circuit of the heater for heating the wax thermoelement on the valve closing side. It is configured to switch the closed circuit to open after a certain period of time.

In the electric valve having the above configuration, when the flow path is interrupted (when the radiator is stopped), the valve opening side is closed and the valve closing side is open. When the radiator is turned on and starts operating, current also flows to the electric heater, causing it to generate heat. When the electric heater generates heat, the wax thermoelement thermally expands, and the valve opening side becomes fully open after 1 to 2 minutes. Note that when the valve is opened, the valve-closing side remains open.

Next, when the radiator operation is stopped, the power to the electric heater on the valve opening side is turned off and the wax thermoelement contracts, and at the same time, the valve opening side operates in the closing direction, and at the same time, the electric heater on the valve closing side turns off. A current flows through the valve and operates the valve closing side in the closing direction. This valve closing on the valve closing side is performed in 1 to 2 minutes. After the valve on the closing side is closed, the opening side also closes with a delay. Next, a timer set slightly longer than the valve closing time on the open side is activated, turning off the power on the valve closing side and fully opening the valve closing side.

2 and 3 show an embodiment of the present invention,
1 is a valve body with a flow path 2 provided therein; 3 is a valve seat formed toward the upstream side with respect to this flow path 2; 4
5 is a valve opening that is in close contact with the valve seat 3 from the upstream side, 5 is a spindle that extends outside the valve body 1 from this valve opening 4, and the upper end of this spindle 5 is in contact with the wax thermoelement 6, and the valve is closed. When the Tux thermoelement 6 expands, the opening valve 4 is opened, and when it contracts, the valve 4 is closed by the reinforcing spring 8. Reference numeral 7 indicates an electric heater attached in contact with the wax thermoelement 6, and is configured to heat the wax thermoelement 6 by generating heat when energized.

9 is a valve seat formed toward the upstream side in the flow path 2 on the downstream side of the valve seat 3;
11 is a closing valve that is in close contact with the valve seat 9 from the upstream side, and 11 is a spindle extending from this closing valve 10 to the outside of the valve body 1. The upper end of this spindle 11 is in contact with the wax thermoelement 12, and this When the wax thermoelement 12 expands, the valve closes, and when it contracts, the valve opens.

Reference numeral 13 indicates an electric heater attached in contact with the wax thermoelement 12, and is configured to heat the wax thermoelement 12 by generating heat when energized. In the figure, 14 indicates an auxiliary spring for closing the valve 10.

FIG. 3 shows the electric circuit of the electric heaters 7, 13, which are connected in parallel to the power sources 15, 15. In the figure, 16 is a relay switch that is turned ON and OFF in conjunction with the operation switch of the radiator, 17 is a timer inserted in parallel with the electric heaters 7 and 13, and 18 is a timer switch that is turned ON and OFF by the timer 17. hand,
This turns on and off the electric circuit leading to the electric heater 13. 19, relay switch 16 is ON
When it becomes OFF, the relay switch 16 is
It is a switch that turns ON when it is turned OFF.

Next, the operation of the above embodiment will be explained.
First, when the radiator operation switch is turned on, the relay switch 16 is turned on and current flows through the electric heater 7 to heat the wax thermoelement 6. The heated wax thermoelement 6 thermally expands and comes into close contact with the valve seat 3 via the spindle 5, and the flow path 2
The opening valve 4 that had been blocking the flow is opened to allow hot water to pass through the flow path 2.

Next, when the radiator operation switch is turned off, the relay switch 16 is turned off and the switch 19 is turned on.
The current to the electric heater 7 is stopped, while the current flows to the electric heater 13 and the timer 17. As a result, the wax thermoelement 6 starts to contract, the wax thermoelement 12 starts to thermally expand, the closing valve 10 comes into close contact with the valve seat 9 and blocks the flow path 2, and the valve opens later. 4 is in close contact with the valve seat 3. Then, when the set time (at least the time required to close the opening valve 4) comes, the timer 17 is activated, the timer switch 18 is turned off, the current to the electric heater 13 is stopped, and the closing valve 10 is opened.

As explained above, the present invention inserts a dedicated opening valve into the flow path in the valve body, one of which opens the flow path when energized, and the other valve that opens the flow path when energized. Since a closing valve is inserted, the opening and closing times can be made almost the same in an electric valve constructed by combining an electric heater and a wax thermoelement.

Therefore, unlike conventional electric valves, the valve closing time is slow and there is little risk of heat radiation loss or rise in room temperature.
In addition, they are cheaper in cost than solenoid valves, and do not open or close abruptly, so water hammer does not occur.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventional electric valve, FIG. 2 is a sectional view of an electric valve according to an embodiment of the present invention, and FIG. 3 is an electric circuit diagram. 1... Valve body, 2... Channel, 3, 9... Valve seat, 4... Valve opening, 6, 12... Wax thermoelement, 7, 13... Electric heater, 10...
...Valve closed, 17...Timer.

Claims (1)

[Scope of utility model registration request] Two valve seats are formed, both facing upstream with respect to the flow path, and one of these valve seats is provided with an opening valve that acts in the opening direction when the wax thermoelement expands, and the other valve seat is provided with an opening valve that acts in the opening direction when the wax thermoelement expands. A closing valve that acts in the closing direction when the wax thermoelement expands is placed on the holder, and a timer is inserted into the electric circuit of the wax thermoelement heater on the valve closing side to close the circuit after a certain period of time. An electric valve configured to be switched to open.