JP2739344B2 - Water governor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a water governor for supplying a constant amount of water by adjusting the pressure fluctuation of supplied water, and is used for a water heater, a water heater and the like. It is suitable.

[Prior Art] A water governor is provided in a water heater, a water heater or the like in order to prevent a change in tapping temperature due to a change in water pressure.

As a structure of a water governor, there is a structure in which a valve body has a cylindrical shape. Specifically, a governor housing through which water flows, a valve seat provided in the governor housing, a cylindrical valve body having a flange that changes an opening area between the valve seat, and the valve seat, An annular valve body provided with a throttle passage that throttles water passing between the flange and a diaphragm that displaceably supports the cylindrical valve body and the annular valve body within the governor housing.

On the other hand, a water heater or a water heater is provided so as to drain water in order to prevent damage to the appliance due to freezing.

[Problems to be Solved by the Invention] However, when the throttle passage formed in the valve body is installed so as to extend particularly in the vertical direction, when water is drained, a film of water due to surface tension is formed in the throttle passage. It is formed. When a water film is formed in the throttle passage, the water film freezes due to a decrease in environmental temperature. When an ice film is formed in the valve body, the throttle passage of the valve body is blocked by the ice film. For this reason, when trying to use the water heater, the water flowing into the water governor is blocked by the ice film, and the water heater does not operate.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a water governor in which a water film is not formed in a throttle passage of a valve body, that is, an ice film is not formed in a throttle passage. On offer.

[Means for solving the problem]

In order to achieve the above object, the water governor of the present invention is:
A governor housing through which water flows, a valve seat provided in the governor housing, a cylindrical valve body having a flange for changing an opening area between the valve seat, and a space between the valve seat and the flange. An annular valve body having a throttle passage through which water passing therethrough, a diaphragm for supporting the cylindrical valve body and the annular valve body in a displaceable manner in the governor housing, and attaching the diaphragm to an upstream side of the water. Urging means for urging the tubular valve element and the annular valve element to a stop position on the upstream side of water when water does not flow into the governor housing; and In a state where the annular valve element is located at the stop position, the annular valve element is disengaged from the inside of the throttle passage to disable formation of a water film due to surface tension, and in a state where the annular valve element is located downstream from the stop position. A throttle projection provided with a projection inserted into the throttle passage, and when water flows into the governor housing, the state of the tubular valve body shifts from the stop position to a downstream position by the flowing water pressure. Thus, while the opening area between the valve seat and the flange changes,
Technical means is employed in which the projection is inserted into the throttle passage to narrow the throttle passage.

[Operation and Effect of the Invention] When draining the water governor, there is no flow of water, the cylindrical valve body and the annular valve body are moved to the stop position by the biasing means, and the protrusions come off the throttle passage. The size of the throttle passage is such that a water film cannot be formed due to surface tension. For this reason, even if water is drained and the environmental temperature decreases, the throttle passage is not blocked by the ice film.

On the other hand, when water flows, the protrusion is inserted into the throttle passage. Therefore, the throttle passage is narrowed by the inserted projection. For this reason, the water governor can control a small amount of water.

〔Example〕

Next, a water governor of the present invention will be described based on one embodiment shown in the drawings.

FIG. 1 is a sectional view of a water governor used in a water heater.

The water governor 1 includes a governor housing 2, a valve seat 3, an upstream support member 4, a cylindrical valve body 5, an annular valve body 6, a diaphragm 7,
It is roughly divided into an upstream coil spring 8, a downstream coil spring 9, and a throttle projection 10.

The governor housing 2 is a container for accommodating the water governor 1 and internally forms a water passage for sending water supplied from below upward. The governor housing 2 has a large diameter on the lower side (upstream) and a small diameter on the upper side (downstream).

The valve seat 3 has an opening through which water passes in a central portion, and is mounted inside the large-diameter portion of the governor housing 2 together with the upstream support member 4, and is fixed by a ring 11.

The upstream support member 4 supports the upstream side of the tubular valve body 5 so that the tubular valve body 5 can move in the vertical direction.
More specifically, the upstream support member 4 includes a small-diameter cylindrical portion 12 that holds the upstream side of the cylindrical valve element 5 from the periphery at the center portion.
It is provided so that water passes through the inside of the opening formed around the periphery.

The tubular valve body 5 is a tubular body that is vertically displaced inside the governor housing 2 and has a flange 13 around an intermediate portion. The flange 13 is located on the upstream side of the valve seat 3, and the opening area between the flange 13 and the valve seat 3 changes when the cylindrical valve element 5 is vertically displaced. An O-ring 14 made of rubber is mounted around the upstream end of the cylindrical valve element 5. The O-ring 14 prevents contact noise generated between the cylindrical valve element 5 and the small-diameter cylindrical portion 12 when the cylindrical valve element 5 vibrates.

The flange 13 has an opening at the body portion of the tubular valve body 5 on the downstream side for guiding water that has passed between the valve seat 3 and the flange 13 to the inside of the tubular valve body 5. The water that has flowed into the cylindrical valve element 5 from this opening is guided to the annular valve element 6 through the central passage of the cylindrical valve element 5.

The annular valve element 6 is provided at the downstream end of the cylindrical valve element 5, and has a throttle passage 15 in the center portion through which water that has passed through the central path of the cylindrical valve element 5 passes.

The throttle passage 15 is opened so that water passes in the vertical direction. The size and shape of the throttle passage 15 are determined so that a film of water is not formed due to surface tension when water is drained from the governor housing 2. Specifically, measures such as a thickness of the minimum inner diameter portion of 2 mm, an inner diameter size of 4.5 mm, and provision of a tapered portion below the minimum inner diameter portion have been taken. When the inner diameter is less than 4.0 mm, a water film is formed due to surface tension.

The diaphragm 7 is made of, for example, resin (including synthetic rubber).
The periphery is fixed in the governor housing 2 by the valve seat 3. The inner periphery of the diaphragm 7 is overlapped with the downstream end of the cylindrical valve body 5 and the annular valve body 6, and further sandwiched between annular plates 16 and 17 from both sides, and the upstream coil spring 8 and the downstream coil spring 9 are provided. Supported by

Then, the annular valve element 6 is displaced together with the cylindrical valve element 5,
All of the water that has passed between the valve seat 3 and the flange 13 passes through the throttle passage 15.

The downstream coil spring 9 is an urging means of the present invention for urging the diaphragm 7 to the upstream side of the water.
When the water does not flow into the inside, the cylindrical valve element 5 and the annular valve element 6 are moved to a stop position on the upstream side of the water (a position shown on the right side in FIG. 1). And this coil spring 9
The spring constant is set to be larger than that of the upstream coil spring 8. That is, when the water pressure on the upstream side of the diaphragm 7 is larger than the water pressure on the downstream side, the tubular valve element 5 is displaced downstream according to the water pressure difference, and the water pressure difference between the upstream side and the downstream side of the diaphragm 7 is reduced. When there is not, the cylindrical valve element 5 is pressed to the upstream side by the coil spring 9 on the downstream side.

The downstream coil spring 9 is a spring made of a shape memory alloy, and the cylindrical valve element 5 and the annular valve element 6
Is increased to the upstream side. As a result, fluctuations in the tap water temperature of the water heater due to fluctuations in the water temperature are prevented.

The throttle projection 10 has a projection 18 inserted into the throttle passage 15 of the annular valve body 6, and has a cylindrical leg 19 on the downstream side for supporting the projection 18 in the governor housing 2. protrusion
Numeral 18 denotes that the water flows into the water governor 1 and the cylindrical valve element 5 and the annular valve element 6 are displaced downstream so as to enter the throttle passage 15 of the annular valve element 6. Restrict the projection 18 to the passage
The purpose of infiltration into 15 is that, since the inner diameter of the throttle passage 15 is opened to such a size that a water film cannot be formed due to surface tension, the small water amount control expected in the throttle passage 15 cannot be obtained. By making the projection 18 penetrate into the throttle passage 15, the passage of the throttle passage 15 is narrowed. That is, when the throttle passage 15 is provided with an inner diameter of 4.0 mm or more as in the embodiment, it is not possible to form a water film and freezing does not occur at low temperatures. Will increase. Therefore, the protrusion 18 is
The water governor 1 is capable of reducing the substantial opening of the throttle passage 15 and making the inner diameter of the throttle passage 15 smaller than 4.0 mm by invading the inside, thereby enabling a small amount of water control.

In addition, around the cylindrical leg portion 19, a throttle passage of the annular valve body 6 is provided.
A plurality of openings are formed to guide water passing through 15 downstream of the water governor 1.

(Operation of Embodiment) Next, the operation of the above embodiment will be briefly described.

When the user opens the callan connected to the water heater, water flows in the governor housing 2. The diaphragm 7 is displaced downstream by the flow of water passing through the governor housing 2, and the projection 18 enters the throttle passage 15. Then, the water passing through the water governor 1 is throttled when passing through the annular valve body 6, and the water pressure difference between the upstream and downstream of the diaphragm 7 increases.

When the water pressure of the water flowing into the cabana housing 2 is high and the water pressure difference between the downstream side and the downstream side is large, the cylindrical valve element 5 is largely displaced downstream and the opening area between the flange 13 and the valve seat 3 is reduced. . Conversely, when the pressure of the water flowing into the governor housing 2 is low and the water pressure difference between the downstream side and the downstream side is small, the amount of displacement of the cylindrical valve element 5 toward the downstream side is small, and the distance between the flange 13 and the valve seat 3 is small. Has a larger opening area. That is, when the water pressure flowing into the water governor 1 is high, the throttle ratio of water increases, and when the water pressure flowing into the water governor 1 is low, the throttle ratio of water decreases. As a result, even if the water pressure flowing into the water governor 1 fluctuates, the amount of water passing through the water governor 1 becomes constant.

When the water heater is drained, the water filled in the water governor 1 is discharged from a drain plug (not shown). When water is drained, there is no pressure difference between the upstream and downstream of the water governor 1. For this reason, the cylindrical valve element 5 and the annular valve element 6
Is pressed to the upstream side by the action of the coil spring 9 on the downstream side. As a result, the projection 18 comes out of the throttle passage 15.

Even if water is drained from the water governor 1, the annular valve 6
A water film due to surface tension is not formed in the throttle passage 15.

As a result, even if the environmental temperature decreases, the inside of the throttle passage 15 is not blocked by the ice film as in the related art. For this reason, even if water is supplied to the water governor 1 in a state where the environmental temperature is lowered, since the water flows through the throttle passage 15, the water bagana operates, and the water heater operates without any inconvenience.

(Modification) Although the example in which the cylindrical valve element 5 and the annular valve element 6 are provided separately has been described, a valve element having an integral cylindrical shape may be used.

Although the example in which the coil spring 9 on the downstream side is formed by a shape memory alloy is shown, the present invention is not limited to this, and may be formed by a normal spring. Needless to say, the upstream coil spring 8 may be made of a shape memory alloy, or a spring may be provided in parallel with the shape memory alloy spring to adjust the amount of water.

[Brief description of the drawings]

 FIG. 1 shows a sectional view of a water governor. In the figure, 1 ... water governor, 2 ... governor housing 3 ... valve seat, 5 ... cylindrical valve body 6 ... annular valve body, 7 ... diaphragm 13 ... flange, 15 ... throttle passage

Claims (1)

(57) [Claims] 1. A cylinder having a flange for changing an opening area between (a) a governor housing through which water flows, (b) a valve seat provided in the governor housing, and (c) a valve seat between the valve seat and the valve seat. (D) an annular valve body provided with a throttle passage through which water passing between the valve seat and the flange passes; and (e) the tubular valve body and the annular valve body are provided with the governor. (F) biasing the diaphragm to the upstream side of water to displace the cylindrical valve body and the annular valve body with water when water does not flow into the governor housing; (G) a biasing means for moving to an upstream stop position; and (g) water which is fixed in the governor housing and which comes off from the throttle passage when the annular valve body is in the stop position. When the film formation is disabled A throttle projection provided with a projection inserted into the throttle passage when the annular valve body is located downstream from the stop position, wherein when water flows through the governor housing, The cylindrical valve element shifts from the stop position to a state located downstream, and the opening area between the valve seat and the flange changes, and the protrusion is inserted into the throttle passage, and Water governor that narrows the throttle passage.