JPH0432266B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hot water supply valve used in an instantaneous water heater or the like.

If you use a regular on-off valve that continuously changes the opening degree over the entire range from 0 to fully open for the hot water supply valve of an instantaneous water heater, etc., if the valve is throttled too much, the flow rate (water supply pressure) required to ignite the burner will decrease. ), heating by the burner is stopped and problems such as hot water turning into cold water frequently occur.

This invention has a structure that always ensures the minimum flow rate necessary for igniting the burner when hot water is supplied, and aims to solve the problem of the burner not igniting because the hot water supply valve is not opened enough, or the burner extinguishing due to being throttled too much. This provides a hot water supply valve with a

An example of this will be explained below based on the drawings.
In the drawings, reference numeral 1 denotes a valve shaft inserted into the center of a cylindrical valve 3 which is anastomosed to a cylindrical valve seat 2 fixed to a valve housing A so as to be freely rotatable. is installed on the inlet side 5a of the valve chamber 5 formed in the cylindrical valve 3, and is provided on the inlet side 5a and the outlet side 5b.
A valve seat 7 provided on a partition wall 6 is biased in the closing direction by a spring 8 and is installed oppositely, and as the valve shaft 1 advances and retreats, the on-off valve 4 approaches and separates from the valve seat 7 to open and close the flow path. It is designed to open and close. Also, valve stem 1
A pin 9 is fixed through the base end of the cylindrical valve 3, and an elongated hole 10 having a width to fit the pin 9 is formed in the base end boss portion 3a of the cylindrical valve 3. The pin 9 is inserted through the elongated hole 10 so that it can freely slide in the axial direction, and the valve shaft 1 is pushed forward.
The cylindrical valve 3 is moved forward to the front end of the elongated hole 10.
Meanwhile, the on-off valve 4 moves linearly in the axial direction within the range of the elongated hole 10, and maintains the required gap S between it and the front wall of the cylindrical valve seat 2 to maintain the on-off valve 4 in a fully open state. The valve shaft 1 and the cylindrical valve 3 are integrally connected through a pin 9 and an elongated hole 10 to prevent relative rotation, and are connected so as to move together in the rotational direction. moreover,
At the base end of the cylindrical valve seat 2, there is a pin 9, that is, a locking recess a that prevents rotation of the valve shaft 1 when the hot water supply valve is closed (when not in use), and a locking recess a that restricts the rotation range of the cylindrical valve 3. A cam body 12 is fixedly installed, which has a cam surface 11 consisting of a flat portion b extending in the circumferential direction, which holds the on-off valve 4 in a fully open state (prevents the valve shaft 1 from retreating in the axial direction by the spring 8). . The cylindrical valve seat 2 and the tip of the cylindrical valve 3 anastomosed thereto are provided with an inflow hole 1 that communicates with the hot water supply inlet 13 and the inlet side 5a of the valve chamber 5.
The cylindrical valve 3 corresponds to the inflow hole 14 of the cylindrical valve seat 2 by drilling the cylindrical valve 3 with respect to the cylindrical valve seat 2 by drilling the cylindrical valve 3 with respect to the inflow hole 14 of the cylindrical valve seat 2 by drilling the cylindrical valve 3 and the flow rate adjustment through hole 15 at different positions.
The opening degree of the flow rate adjustment through hole 15 can be continuously increased or decreased within the range of the flat portion b of the cam surface 11. In addition, an outflow hole 17 and a flow rate adjustment hole 18 communicating with the outlet side 5b of the valve chamber 5 and the hot water supply outlet 16 are bored in the center of the cylindrical valve seat 2 and the cylindrical valve 3 at different positions. By rotating the cylindrical valve 3 with respect to the cylindrical valve seat 2, the opening degree of the flow rate adjustment hole 18 of the cylindrical valve 3 with respect to the outflow hole 17 can be changed in the same manner as in the case of the inflow hole 14 and the flow rate adjustment hole 15 described above. The amount of hot water supplied is continuously adjusted by rotating the cylindrical valve 3. Here, at the rotation start end of the cylindrical valve 3, the outflow hole 17 of the cylindrical valve seat 2
On the other hand, the flow rate adjusting hole 18 of the cylindrical valve 3 always has a constant opening degree. Reference numeral 19 denotes a bypass hole bored in the tip end surface of the cylindrical valve seat 2. By moving the throttle valve 20 screwed into the valve housing A back and forth, the bypass hole 1 is opened.
9 is adjusted so that the minimum flow rate required for burner ignition 6 can be obtained. In addition, 21 in the figure is an operating knob fixed to the base end of the valve stem 1;
B is a flow path switching device connected to the hot water supply outlet 16;
By moving the switching valve 22 forward and backward within a certain range, hot water from the hot water supply outlet 16 can be switched and supplied to a flow path 23 to the faucet or a flow path 24 to the shower.

In the above configuration, when the valve stem 1 is pushed (advanced) by a certain stroke, that is, in the axial direction against the spring 8 until the pin 9 touches the end surface of the elongated hole 10, the on-off valve 4 at the tip of the valve stem 1 moves forward. The on-off valve 4 is kept in a fully open state by being separated from the seat 7 to allow communication between the inlet side 5a and the outlet side 5b of the valve chamber 5, and a required gap S is created between the on-off valve 4 and the front wall of the cylindrical valve seat 2. The hot water supply inlet 13 is connected to the bypass hole 19 which is opened to a predetermined opening degree by the throttle valve 20, that is, to an opening degree that provides the minimum flow rate necessary for igniting the burner.
By squeezing the hot water, the bypass hole 19, the gap S, the opening of the on-off valve 4, the flow rate adjustment hole 18, and the outflow hole 17
The hot water flows through the hot water supply outlet 16, and the ends of the protruding portions at both ends of the pin 9 escape from the locking recess a of the cam surface 11. Subsequently, when the valve shaft 1 is rotated in a certain direction (to the right in FIG. 5), the cylindrical valve 3 which is integrally connected to the valve shaft 1 in the rotational direction via the pin 9 and the elongated hole 10 rotates integrally with the valve shaft 1, and gradually increases the degree of opening of the flow rate adjusting holes 15 and 18 with respect to the inlet hole 14 and the outlet hole 17 of the cylindrical valve seat 2, thereby gradually increasing the flow rate.

In the series of pressing and rotating operations described above, the valve stem 1 is pushed in the axial direction by a certain stroke, the valve stem 1 is rotated in the certain direction a little while the pressure is released, and both ends of the pin 9 protrude. The opening/closing valve 4 is kept fully open because the flat part b of the cam surface 11 receives the restoring force of the spring 8 and is reliably engaged and held.
The degree of opening of the flow rate adjusting holes 15 and 18 relative to the inflow hole 14 and the outflow hole 17 can be adjusted as appropriate within the rotation range of the flat portion b. Thus, at a required forward (advance end) position of the valve shaft 1, the hot water from the hot water supply inlet 13 can be regulated to the minimum flow rate necessary for igniting the burner, and can flow out to the hot water supply outlet 16.

In the above embodiment, the bypass passage 19 is connected to the throttle valve 20.
However, the throttle valve 20 was eliminated and the bypass passage 1 was
The object of the present invention can also be achieved by setting the opening of the flow rate adjusting hole 18 relative to the outflow hole 17 as a throttle with the hole 9 fully opened to obtain the minimum flow rate necessary for igniting the burner. In this case, the inflow hole 14 and the flow rate adjustment hole 15 are unnecessary, and it is clear that the outflow hole 17 and the flow rate adjustment hole 18 may be provided on the inflow side. Furthermore, it goes without saying that the present invention can also be applied to water supply valves.

As explained above, this invention has a structure in which the minimum flow rate necessary for igniting the burner can be obtained by pressing the valve stem, and the gradual increase in flow rate can be reliably obtained by rotating the valve stem. It is highly economical as it does not drain out more hot water than necessary, and there is no need to extinguish the burner due to excessively restricting the amount of hot water supply, eliminating the problem of hot water becoming cold during use and ensuring reliable burner ignition. This also has the effect of significantly improving safety.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing one embodiment of the present invention, Fig. 2 is a sectional view taken along line XX in Fig. 1, and Fig. 3 is a sectional view taken along line Y-Y in Fig. 1.
4 is a cross-sectional view of only the cylindrical valve seat and the cylindrical valve along Z-Z, and FIG. 5 is a developed view of the inner peripheral surface of the cam body. 1...Valve stem, 2...Cylindrical valve seat, 3...Cylindrical valve, 4...Opening/closing valve, 9...Pin, 10...Long hole, 11...Cam surface, 1
2...Cam body, 14...Inflow hole, 15, 18...Flow rate adjustment hole, 17...Outflow hole, 19...Bypass hole.

Claims (1)

[Claims] 1. A cylindrical valve is inserted into the valve shaft so as to be unrotatable but movable in the axial direction. A throttle hole is provided on the periphery or in front of the valve, and a passage opening/closing is provided in the hollow part of the cylindrical valve at the tip of the valve shaft. By installing a valve and pushing the valve stem a certain distance in the axial direction, the opening/closing valve is moved and the flow path is opened, and the throttle is pre-throttled to an opening that provides the minimum flow rate necessary for igniting the burner. In addition to supplying the flow rate from the through hole, the opening degree of the flow rate adjustment hole provided around the periphery of the cylindrical valve is adjusted by rotating the cylindrical valve by rotating in a certain direction following the pushing of the valve stem. A hot water supply valve characterized in that the flow rate can be adjusted to a required level.