JPH10220610A - Constant flow valve with water temperature compensation function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve governor performance and productivity of a constant flow valve with a water temperature compensation function. SOLUTION: A load of a governor spring 14 made of a shape memory alloy and changing a spring constant according to a change in water temperature balances with a differential pressure applied to a differential pressure plate 4, and a constant flow valve V with a water temperature compensation function for controlling a flow to a constant value by an upper valve 9b and a lower valve 9a is provided with an adjusting part 5 for adjusting a contact position of an upper valve 9b and an upper sheet part 2b, and a guide 1 for guiding the upper valve 9b of a movable valve body V2 is formed by extending a tapered part of the upper seat part 2b. A stop spring 15 formed of spring wire is shaped like a triangle whose center side is cut away and is deformed in the direction of the cutout to fit three vertexes in engaging holes, whereby the movable valve body V2 urged in the protruding direction is received.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a constant flow valve of a water heater, and more particularly to a constant flow valve of a water heater having a water temperature correcting function.

[0002]

2. Description of the Related Art Heretofore, a constant flow valve having a water temperature correction function has been known. For example, JP-A-63-303281
As shown in the publication, the water heater has a constant flow valve that has both a governor function that does not change the flow rate even if there is a change in supply water pressure and a water temperature correction function that increases or decreases the flow rate according to a change in water temperature. It is installed in the water supply channel to prevent the influence of the fluctuation of the supply water pressure and the input water temperature on the hot water temperature on the outlet water temperature. However, a constant flow valve with a water temperature correction function (hereinafter,
It is called a constant flow valve. ) Has a problem that it becomes expensive because a shape memory alloy is used. Therefore, focusing on resinification of the main components of the constant flow valve,
The cost is reduced by reducing the number of processing steps, and a constant flow valve with a water temperature correction function can be manufactured at low cost. In addition, the weight of the constant flow valve is reduced by using resin.

[0003]

However, in resin molding, burrs are generated on the mating surfaces of the resin molds. In particular, when burrs are generated around important valves in a constant flow rate valve, the burrs are generated. , Or catch on a burr, the valve tilts with respect to the central axis, and a new problem arises in that the water amount is not properly controlled. For example, in a constant flow valve V with a water temperature correction function shown in FIG. 4, a resin mold for resin-molding the upper sheet portion 2a to which the valve comes and goes, and a resin mold for resin-forming a through hole 3 forming a water passage. In the resin molding, the direction of pulling out the resin mold is different. Since the joint of these resin molds is formed at the lower end of the upper sheet portion 2a, burrs are easily generated at this boundary. As a result, if the burrs are caught between the upper valve portion 9a and the upper seat portion 2a, there is a problem that the flow rate cannot be controlled.

A movable valve body V3 for controlling the degree of opening of the flow path
No. 2 is governed by the inclination of the governor spring 32 which is urged in the valve opening direction, and the inclination is influenced by the governor spring 32. In order to stabilize the governor characteristics, it is necessary to use the governor spring 32 having a small inclination. I was

[0005] The movable valve body V32 includes a governor spring 32.
As a result, it is urged from the fixed valve body V31 in the valve opening direction, and thus is locked by the C-shaped or ring-shaped stopper 30 and is prevented from jumping out of the fixed valve body V31. However, it is difficult to process the mounting portion of the fixing member 30 on the fixed valve body V31 (the mounting portion has an undercut shape and cannot be resin-molded, so it must be cut). There has been a problem that a dedicated assembling jig has to be used for assembling into the fixed valve body V31.

Therefore, the constant flow valve with a water temperature correction function of the present invention solves the above problems, solves the problems associated with resinification, and utilizes the advantages of resin molding that can easily mold complicated shapes. An object of the present invention is to make it possible to manufacture a constant flow valve at a low cost and to secure the conventional governor performance.

[0007]

According to a first aspect of the present invention, there is provided a constant flow valve having a water temperature correcting function, which is fixed to a water supply passage and has an upper seat portion and a lower seat portion on a cylindrical inner surface. A fixed valve body, an upper valve and a lower valve which are inserted coaxially with the fixed valve body so as to be able to advance and retreat coaxially therewith and which come into contact with and separate from the upper seat portion and the lower seat portion of the fixed valve body, respectively; A movable valve body provided with a differential pressure plate for receiving a pressure difference between before and after the hole, and a heat-sensitive member whose spring constant changes according to a change in water temperature. A governor spring that urges the pressure of the governor spring and the differential pressure acting on the differential pressure plate are balanced to control the flow rate to be constant. And a screw part fixed to the fixed valve body By extending the upper seat and summarized in that the formation of the guide portion for guiding the central axis of the upper valve of the movable valve body.

According to a second aspect of the present invention, there is provided a constant flow valve having a water temperature correction function according to the first aspect of the present invention.
A locking hole opening around the upstream side surface of the fixed valve body,
The gist of the present invention is that a spring wire is bent to form a substantially triangular shape with a center cut off on one side, and a stop spring is fitted into the locking hole to prevent the movable valve body from protruding.

In the constant flow valve having the water temperature correcting function according to the first aspect of the present invention, the upper seat portion is provided separately from the fixed valve body, and is fixed to the fixed valve body by the screw portion. The guide formed by extending the upper seat portion guides the upper valve of the movable valve body toward the center as the movable valve body closes. Therefore, in the case of resin molding, the upper sheet portion and the fixed valve body can be separately resin-molded, and the resin molding becomes easy, and the upper sheet portion has a molding problem occurring at the joint of the resin mold. No burr occurs. (When the fixed valve body is integrally resin-molded with the upper sheet portion, the end portion of the upper sheet portion becomes a seam of the resin mold, and burrs are likely to occur in molding.) By providing a separate body, it is possible to provide a sufficiently large guide portion for guiding the upper valve of the movable valve body. The guide portion functions to guide the movable valve body toward the center as the movable valve body moves in the valve closing direction. Therefore, the inclination of the movable valve body with respect to the fixed valve body is corrected, concentricity is easily maintained, and governor performance is improved. Further, since the guide portion corrects the inclination, the inclination of the governor spring can be allowed to some extent, and the governor spring can be manufactured at low cost.

In the constant flow valve having a water temperature correcting function according to the second aspect of the present invention, the stop spring for bending the spring wire and forming a substantially triangular shape in which the center of one side is notched is formed in the notch direction. The three vertices are bent and fitted into locking holes around the side surface of the fixed valve body, locked and receive the movable valve body urged in the protruding direction. Therefore, it becomes easy to incorporate the movable valve body as a constant flow valve,
Can be securely retained. In addition, a dedicated jig is not required for assembling. Also, when the fixed valve body is molded with resin, it can be integrally molded with the resin including the locking hole.
The conventional recess processing is not required.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to further clarify the structure and operation of the present invention described above, a preferred embodiment of the constant flow valve of the present invention will be described below. FIG. 1 is a schematic diagram of a constant flow valve V as one embodiment. V1 is a cylindrical fixed valve body, and has a lower seat portion 2a which forms a seat surface inclined with respect to the central axis inside. Similarly, on the upper portion of the fixed valve body V1, a control valve 5 forming an upper valve seat portion 2b, which is a seat surface inclined with respect to the center axis, is coaxial with the above-described lower seat portion 2a and is provided with a screw portion. Fixed to 6. Therefore, the adjustment valve 5 adjusts the position of the upper valve seat portion 2b in the axial direction by adjusting the degree of screwing.

Further, the upper seat portion 2 formed on the control valve 5
b is partially extended downward at an upstream angle while maintaining a tilt angle, and a guide portion 1 is provided to reliably guide a movable valve body V2 described later in the central axis direction. Fixed valve element V1 and control valve 5
The resin is molded as a separate part, and the surface is smoothly molded so that burrs on the resin molding do not occur in the upper seat portion 2b and the guide portion 1 of the control valve 5. Further, the guide portion 1 is provided sufficiently large.

The cylindrical outer peripheral surface of the fixed valve body V1 is provided between the upper valve seat 2b and the lower seat 2a.
A plurality of through-holes 3 are provided to guide water passing through a lower valve portion 9a and an upper valve portion 9b of a movable valve body V2 described later to a downstream side. An O-ring 7 is attached to the outer peripheral groove portion 17 of the fixed valve body V1 to abut against and seal the inner wall surface 21 of the flow path, and is sandwiched between the stepped portion 18 of the flow path and the retaining ring 8 so as to be fixed.
1 is fixed to the channel.

V2 inserted into the fixed valve body V1 is a movable valve body, and a lower valve portion 9a which comes into contact with and separates from a lower seat portion 2a and an upper valve seat portion 2b provided on the fixed valve body V1.
And an upper valve portion 9b provided on the upper and lower sides, a U-ring seal 11 is mounted on the outer periphery, slides on the inner wall 10 of the fixed valve body, and a differential pressure plate 4 which partitions the flow path between the upstream side and the downstream side is provided on the upstream side. It is provided integrally. The differential pressure plate 4 is provided with a flow path hole 12a penetrating the center of the shaft and a plurality of flow path holes 12b around the flow path hole 12a. The upstream side of the differential pressure plate 4 communicates with the upper space in the fixed valve body V1. doing. A plurality of lateral holes 13 are formed in the outer peripheral side surface of the movable valve body V2 between the differential pressure plate 4 and the lower valve portion 9a so as to be orthogonal to the axis, and communicate with the flow passage hole 12a.

The U-ring seal 11 is made of an elastic material made of rubber, and is formed in a U-ring shape which can be easily compressed.
The U-ring-shaped opening is mounted on the outer periphery of the differential pressure plate 4 with the U-ring-shaped opening directed toward the upstream side, and the end side surface of one side of the U-ring is in contact with the inner wall 10 to seal, thereby reducing sliding resistance.

A governor spring 14 is disposed coaxially between the control valve 5 and the movable valve body V2 provided on the fixed valve body V1 so that the movable valve body V2 moves away from the control valve 5. Be inspired. Then, by the differential pressure generated before and after the governor spring 14 and the differential pressure plate 4 and the governor spring 14 force being balanced,
The flow rate passing through the lower valve section 9a and the upper valve section 9b is controlled to be constant. A stop spring 15 is provided upstream of the fixed valve body V1 to receive the protrusion of the inserted movable valve body V2.
Further, the governor spring 14 uses a shape memory alloy which is a heat-sensitive member whose spring constant changes according to a change in water temperature, and is selected such that a spring load characteristic with respect to temperature has an appropriate proportional relationship with an actual hot water supply temperature. .

Lock holes 16 are provided at three locations around the side surface of the fixed valve body V1 at a predetermined distance from the upstream end portion (FIG. 2). The locking hole 16 is formed simultaneously when the fixed valve body V1 is molded with resin. Also, a stop spring 15 formed by bending a spring wire forms a substantially triangular shape in which the center of one side of the triangle is cut off, and three vertices are fitted into locking holes on the side surface of the fixed valve body. And the stop spring 15
The movable valve body V2 is received to prevent its protrusion. The stop spring 15 can be fitted easily by bending the triangular apex into the locking hole 16 while bending in the notch direction. Therefore, when assembling, a special jig is not required, and the constant flow valve can be easily incorporated.

The components other than the O-ring 7, the retaining ring 8, the U-ring seal 11, the governor spring 14, and the retaining spring 15 are made of resin.

Next, the water temperature correction function will be described. In this constant flow valve V, the spring force increases and decreases according to the change in the incoming water temperature, and the valve gap between the fixed valve body V1 and the movable valve body V2 increases and decreases in proportion. Increases or decreases proportionally. For example, the governor spring 14 detects the incoming water temperature and changes its spring constant in response to the change of the incoming water temperature between summer and winter, and the fixed valve body V1 has a lower seat portion 2a and an upper seat portion 2b and a movable valve. Body V2
By automatically adjusting the valve interval between the two, the water flow rate corresponding to the incoming water temperature is secured. That is, when the incoming water temperature is high as in summer, the governor spring 14 senses this and increases the spring constant to increase the resilience. The valve interval between the lower seat portion 2a and the lower valve portion 9a is kept wide, and the water flow increases. In addition, when the incoming water temperature is low as in winter, the governor spring 14 senses this and lowers the spring constant. In order to weaken the resilience, the valve interval between the lower seat portion 2a and the lower valve portion 9a is kept small, and the amount of water flow decreases. Accordingly, in controlling the hot water supply temperature by adjusting the gas amount, the maximum capacity limit of the water heater is not exceeded even if the incoming water temperature changes. Further, the governor spring 14 and the differential pressure before and after the differential pressure plate 4 are balanced against the fluctuation of the supply water pressure, and the valve opening of the lower valve portion 9a of the fixed valve body V1 and the lower valve portion 9a of the movable valve body V2 are reduced. It has a governor function that automatically controls the flow rate to be constant. Therefore,
Even if the supply water pressure fluctuates, the flow rate is kept constant.

The above-mentioned constant flow valve with water temperature correction V
Is incorporated in a water supply passage 23 to the heat exchanger 22, as shown in FIG. When hot water tap 24 is opened at the time of hot water supply,
The water flow sensor S1 detects the flow of water, the original solenoid valve MV1 and the main solenoid valve MV2 provided in the gas supply path are operated, and the amount of fuel gas corresponding to the target set temperature is adjusted by the operation of the solenoid proportional valve MV3. It is supplied to the burner 25. as a result,
The water heater always maintains hot water at a set temperature.
F denotes a forced air supply fan, 26 denotes a combustion chamber, 27 denotes an exhaust pipe, 28 denotes a hot water temperature sensor, and 29 denotes a controller.

As described above, the constant flow valve V of this embodiment
The guide portion 1 provided on the fixed valve body V1 has a movable valve body V2.
By guiding the upper valve portion 9b in the central axis direction, the inclination of the movable valve body V2 is corrected, concentricity is easily maintained, and governor performance is improved. Further, the stop spring 15 facilitates the incorporation of the movable valve body V2 as the constant flow valve V, and also ensures that the movable valve body V2 is securely prevented from falling off. Moreover, when the stop spring 15 is incorporated, no special jig is required. Also, of course, attachment and detachment at the time of repair can be easily performed, and the repair time can be shortened.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and it is needless to say that the present invention can be implemented in various modes without departing from the spirit of the present invention. It is.

For example, in this embodiment, the upper seat portion 2b formed in the control valve 5 is partially extended downward, and the guide portion 1 is provided so as to guide the movable valve body V2 toward the center. However, the guide portion 1 may be extended over the entire circumference.

In the present embodiment, three locking holes 16 are provided around the side surface separated from the upstream end of the fixed valve body V1 by a predetermined distance. Any number can be used as long as it can be locked.

[0025]

As described in detail above, claim 1 of the present invention
According to the constant flow valve with the water temperature correction function described above, it is possible to manufacture the filter at low cost and to achieve an excellent effect that the governor performance is stabilized.

Further, according to the constant flow valve with the water temperature correction function of the second aspect, in addition to the effect of the first aspect, the assembly becomes easy and the productivity can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a constant flow valve with a water temperature correction function as one embodiment.

FIG. 2 is a schematic view of mounting a stop spring according to the embodiment of the present invention.

FIG. 3 is a schematic view of a water heater according to an embodiment of the present invention.

FIG. 4 is a schematic configuration diagram of a conventional constant flow valve with a water temperature correction function.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Guide part V Constant flow valve V1 Fixed valve body V2 Movable valve body 2a Lower seat part 2b Upper seat part 3 Through hole 4 Differential pressure plate 5 Control valve 6 Screw part 7 O-ring 8 Retaining ring 9a Lower valve part 9b Upper valve part 10 Inner wall 11 U-ring seal 12 Channel hole 13 Side hole 14 Governor spring 15 Stop spring 16 Lock hole 17 Outer peripheral groove 18 Step MV1 Main solenoid valve MV2 Main solenoid valve MV3 Electromagnetic proportional valve F Fan for forced air supply S1 Water flow sensor 21 Inner wall surface 24 Hot water tap 25 Burner 26 Combustion chamber 27 Exhaust tube 28 Hot water temperature sensor 29 Controller

Claims (2)

[Claims] 1. A fixed valve body fixed to a water supply passage and having an upper seat portion and a lower seat portion on a cylindrical inner surface, and inserted into the fixed valve body so as to be able to advance and retreat coaxially with the fixed valve body. A movable valve body having an upper valve and a lower valve that are respectively in contact with and separated from the seat portion and the lower seat portion, a hole through which water is passed, and a differential pressure plate that receives a differential pressure between the holes before and after the hole; A governor spring formed of a heat-sensitive member whose spring constant changes in accordance with the change, and biases the movable valve body in a valve opening direction; and a load of the governor spring and a differential pressure acting on the differential pressure plate are balanced. Then, in the constant flow valve with the water temperature correction function for controlling the flow rate to be constant, the upper seat portion is provided separately, a screw portion for fixing to the fixed valve body, and the upper seat portion being extended to extend over the movable valve body. Forming a guide part for guiding the valve in the central axis direction Water temperature correction function constant flow valve characterized. 2. A locking hole opening around the upstream side surface of the fixed valve element, and a substantially triangular shape formed by bending a spring wire and cutting off the center of one side. 2. The constant flow valve according to claim 1, further comprising a stop spring for preventing the movable valve body from projecting.