JPH11325274A - Mixing valve for hot-water supply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mixing valve for a hot-water supply capable of being surely restarted all times by using a step motor as a driving source. SOLUTION: A pair of threading members 43a, one being moved forward and backward in a axial direction and the other being rotated only around an axis, are arranged on a portion of a screw mechanism 45, non-rotary stoppers 57, 58 are protruded in the axial direction on the threading member on the side of being moved forward and backward in the axial direction and rotary stoppers 47, 48 are provided on the threading member 43a on the side of being rotated around the axis for rotating itself together with the threading member 43a, so that the rotary stoppers 47, 48 are put in contact with the non-rotary stoppers 57, 58 in the direction of rotation by the movement of the threading member on the side of being moved forward and backward in the axial direction to restrict a movement rage of a valve driving shaft 20 in the axial direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixing valve of a hot water supply device in which a mixing ratio and a flow rate of hot water and water sent to a tapping pipe in a hot water supply device are controlled by two step motors.

[0002]

2. Description of the Related Art Generally, a mixing valve of a water heater using two step motors controls a mixing ratio and a flow rate of hot water and water by rotating and sliding a valve body. The shaft is driven in the rotational direction by one step motor, and is driven in the axial direction by the other step motor via a screw mechanism.

[0003]

In such a mixing valve of a water heater, when the valve element moves axially to the operating end and is forcibly stopped, the screw mechanism further receives the rotational force of the stepping motor. In some cases, the male screw and the female screw bite into each other, and the stepping motor having a weak starting force may not be able to restart in the reverse direction.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a mixing valve of a hot water supply device which can always surely be restarted by using a stepping motor as a drive source.

[0005]

In order to achieve the above object, a mixing valve of a hot water supply apparatus of the present invention comprises a hot water supply pipe to which hot water is supplied, a water supply pipe to which water is supplied, and mixing of hot water and water. A hot water supply pipe connected to the hot water supply pipe and a valve element drive shaft for driving a valve element for controlling a mixing ratio and a flow rate of hot water and water sent from the water supply pipe to the hot water supply pipe, In the mixing valve of the water heater in which the first step motor is driven in the rotation direction and the second step motor is driven in the axial direction via the screw mechanism, one moves only in the axial direction and the other moves around the axis. A pair of screw members that rotate only are arranged in the screw mechanism portion, and a non-rotational stopper is protruded in the axial direction on the screw member that advances and retreats in the axial direction, and a screw that rotates about the axis. The rotating member rotates with the threaded member. The rotation stopper comes into contact with the non-rotation stopper in the rotation direction by moving the screw member on the side that advances and retreats in the axial direction, and the axial movement range of the valve body drive shaft is provided. Is regulated.

[0006] The screwing member which moves only in the axial direction may be slidably supported by a shaft arranged in parallel with the screw mechanism, and the screw member which moves only in the axial direction may slide. The engaging member and the screw member that rotates only around the axis may be a male screw member and a female screw member that constitute the screw mechanism itself.

The valve body has a valve section for controlling the mixing ratio of hot water and water by rotating about an axis, and a valve section for controlling the flow rate of hot water by moving in the axial direction. Is also good.

[0008]

Embodiments of the present invention will be described with reference to the drawings. FIGS. 1 and 2 show a mixing valve of a hot water supply apparatus according to a first embodiment of the present invention, in which an upstream portion of a U-shaped pipe is provided with a water supply pipe 2 from which water is sent, and a downstream side. A part is a tapping pipe 3 from which hot water and a mixed hot water are sent out. The hot water supply pipe 1 from which the hot water is sent is connected to the intermediate pipe 4, and the hot water and the water are mixed in the intermediate pipe 4.

The valve element is divided into a mixing ratio control valve element 10A for controlling the mixing ratio of hot water and water, and a tapping flow rate control valve element 10B for controlling the tapping flow rate. The two valve bodies 10A and 10B are driven by one valve body drive shaft 20 arranged at the position.

That is, the tapping flow control valve element 10B is formed in a plug shape to close the outlet of the intermediate pipe 4 and is integrally connected to the distal end portion of the valve element driving shaft 20, and moves forward and backward in the axial direction. The sectional area of the communication passage between the intermediate pipe 4 and the tapping pipe 3 is changed.

The mixing ratio control valve element 10A is formed in a cylindrical shape in contact with the intermediate pipe 4, and a male screw formed on the outer peripheral surface thereof is formed into a female screw formed on the inner peripheral surface of the intermediate pipe 4. Is screwed into. Numeral 11 denotes the screw portion. At a position facing the intermediate pipe 4 from the water supply pipe 2 side, a valve seat 12 having a dimension and shape inscribed in the mixing ratio control valve body 10A is provided.

Therefore, when the mixing ratio control valve element 10A moves in the axial direction, the side wall portion changes the cross-sectional area of the communication passage between the hot water supply pipe 1 and the intermediate pipe 4, and the mouth portion is connected to the water supply pipe 2. The cross-sectional area of the communication passage with the intermediate pipe 4 is changed, and when the former increases, the latter decreases, and when the former decreases, the latter increases, whereby the mixing ratio of hot water and water is controlled.

FIG. 1 shows a state where the tapping flow rate is zero at a mixing ratio of 100% water, and FIG. 2 shows a state where the tapping flow rate is maximum at a mixing ratio of 100% water. Is shown.

A key groove 13 is formed on the inner peripheral surface of the mixing ratio control valve body 10A in parallel with the axis, and a projection 14 projecting laterally from the valve body drive shaft 20 is formed in the key groove 13. Is engaged.

Therefore, the mixing ratio control valve element 10A is screwed (moves in the axial direction while rotating) by the rotation of the valve element drive shaft 20, and the effect is exerted even if the valve element drive shaft 20 moves in the axial direction. Absent. Reference numeral 15 denotes a coil spring mounted for preventing rattling.

With this configuration, hot water and water are mixed in the intermediate pipe 4. At this time, the water flows in the cylindrical mixing ratio control valve 10A in the axial direction, and the hot water is mixed in the mixing ratio control valve 10A. Water flows into the intermediate pipe 4 from the outer periphery of the valve body 10A in the same direction as water.

In this way, the hot water is poured from the outer peripheral side in the same direction as the flow of the water so that the hot water and the water are mixed, so that almost no noise is generated in the mixing section.

As shown in FIG. 3, stoppers 17 and 18 for regulating the rotation range of the mixing ratio control valve body 10A protrude in the axial direction at the upper and lower ends of the mixing ratio control valve body 10A. The fixed stoppers 7 and 8 which come into contact therewith are projected from the fixed portion side of the conduit.

Therefore, when the mixing ratio control valve element 10A is screwed and enters the position where the stoppers 17 and 18 interfere with the fixed stoppers 7 and 8, the stoppers 17 and 18 rotate with respect to the fixed stoppers 7 and 8 in the rotational direction. , Thereby stopping the rotation of the valve body drive shaft 20 and restricting the movement range of the mixing ratio control valve body 10A.

In order to drive the valve body drive shaft 20, a rotary drive step motor 31 and an axial drive step motor 41 are provided in the same housing 30, and a base end of the valve body drive shaft 20 is provided. It is arranged in the housing 30.

The rotation of the stepping motor 31 for rotation is
The power is transmitted to the rotation driving output gear 33 via the reduction gear 32. The rotation drive output gear 33 is connected to the spline shaft 34 integrally connected to the base end of the valve body drive shaft 20 and the keyway 3.
5 is engaged.

Therefore, the rotational movement of the rotary drive output gear 33 is transmitted to the valve body drive shaft 20 as it is, and the mixture ratio control is performed by the mixture ratio control valve body 10A.
0 can freely move in the axial direction with respect to the rotation driving output gear 33.

The rotation of the stepping motor 41 for driving in the axial direction is controlled by the output gear 43 for driving in the axial direction via the reduction gear 42.
Is transmitted to Gear shaft 4 of output gear 43 for axial driving
A female screw formed on the inner surface of 3a is screwed with a male screw formed on the outer periphery of a male screw cylinder 44 fitted to the valve body drive shaft 20 to form a screw mechanism 45.

The male screw cylinder 44 is attached to the valve drive shaft 20 so as to be rotatable but not movable in the axial direction, and is engaged with a key groove 46 formed in the housing 30.

Therefore, the output gear 43 for driving in the axial direction is provided.
, The male screw cylinder 44 is thereby moved in the axial direction without rotating, and the valve body drive shaft 20 is moved in the axial direction at the same time, and the tapping flow rate is controlled by the tapping flow rate control valve element 10B.

Gear shaft 43 of output gear 43 for axial driving
On the outer surface of a (screw member), a male screw having a large pitch is formed, and a screw piece 52 (screw member) having an internal screw formed on the inner surface thereof is engaged with the valve body drive shaft 20. It is slidably attached to a shaft rod 51 arranged in parallel.

FIG. 4 shows the portion of the gear shaft 43a and the screw piece 52 (the gear portion of the axial driving output gear 43 is not shown), and FIG. 5 is an exploded view thereof. .

The gear shaft 43 of the output gear 43 for driving in the axial direction
Rotation stoppers 47 and 48 are formed at both upper and lower ends of a to protrude toward the side, and non-rotation stoppers 57 and 58 are formed at both upper and lower ends of the screw piece 52 so as to protrude in both upper and lower directions. 52a is a fitting hole through which the shaft rod 51 passes.

Therefore, the output gear 43 for driving in the axial direction is provided.
Rotates, the screw piece 52 slides along the shaft rod 51, and when the non-rotation stoppers 57, 58 enter a position where they interfere with the rotation stoppers 47, 48, the rotation stoppers 47, 48 move the non-rotation stoppers 57, 48. 58, the rotation of the axial driving output gear 43 is stopped, and the axial movement range of the valve body drive shaft 20 (that is, the movement range of the tapping flow control valve body 10B) is restricted. You.

According to such a configuration, the valve body drive shaft 20
When the axial movement range is restricted, the rotation stoppers 47 and 48 abut against the non-rotation stoppers 57 and 58 in the rotation direction, and the axial driving output gear 43 and the male screw cylinder 44 are rotated.
Since the rotational force of the stepping motor 41 for axial driving is not transmitted to the screw mechanism 45 into which the screw is screwed, the biting phenomenon of the male screw and the female screw in the screw mechanism 45 does not occur. Therefore, it can be easily restarted the next time the axial driving step motor 41 is rotated reversely.

FIGS. 6 and 7 show a mixing valve of a water heater according to a second embodiment of the present invention. Compared with the first embodiment, the arrangement of the water supply pipe 2 and the tapping pipe 3 is different. It is upside down.
Accordingly, the mixing ratio control valve body 10A and the tapping flow rate control valve body 10B are also arranged in reverse to those in the first embodiment.

Further, the stepping motor 31 for rotation, the stepping motor 41 for driving in the axial direction, the output gear 33 for driving in rotation and the output gear 43 for driving in the axial direction are also arranged in reverse to the first embodiment. The non-rotational stoppers 57 and 58 for restricting the movement range of the body drive shaft 20 in the axial direction and the rotation stoppers 47 and 48 that come into contact with the non-rotational stoppers 4
4 are formed at the upper and lower ends and inside the output gear 43 for driving in the axial direction.

Other configurations of the second embodiment are the same as those of the first embodiment, and the same functions and effects as those of the first embodiment can be obtained.

[0034]

According to the present invention, a pair of screw members are disposed on a screw mechanism portion for driving the valve body drive shaft to advance and retreat in the axial direction, and the rotation stopper provided on the pair of screw members is not provided. By contacting the rotation stopper against the rotation stopper in the rotation direction, the range of movement of the valve body drive shaft in the axial direction is regulated. Can be restarted.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a mixing valve of a water heater according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the mixing valve of the water heater according to the first embodiment of the present invention in a different state.

FIG. 3 is a partial perspective view of the vicinity of a mixing ratio control valve element of the mixing valve of the water heater according to the first embodiment of the present invention.

FIG. 4 is a partial perspective view of the vicinity of a screw piece of the mixing valve of the water heater according to the first embodiment of the present invention.

FIG. 5 is a partially exploded perspective view of the vicinity of a screw piece of the mixing valve of the water heater according to the first embodiment of the present invention.

FIG. 6 is a longitudinal sectional view of a mixing valve of a water heater according to a second embodiment of the present invention.

FIG. 7 is a longitudinal sectional view of a mixing valve of a water heater according to a second embodiment of the present invention in a different state.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 hot water supply pipe 2 water supply pipe 3 tapping pipe 10A mixing ratio control valve element 10B tapping flow rate control valve element 20 valve element drive shaft 30 housing 31 rotational drive step motor 33 rotational drive output gear 41 axial drive step motor 43 axial direction Drive output gear 43a Gear shaft 44 Male screw cylinder 45 Screw mechanism 47,48 Rotation stopper 52 Screw piece 57,58 Non-rotation stopper

Claims (4)

[Claims] A hot water supply pipe to which hot water is supplied, a water supply pipe to which water is supplied, and a hot water supply pipe for mixing and sending hot water and water are connected, and the hot water supply pipe and the hot water supply pipe are connected to the hot water supply pipe. A valve drive shaft for driving a valve for controlling a mixing ratio and a flow rate of hot water and water sent out to the rotor is driven in a rotating direction by a first step motor, and a screw motor is driven by a second step motor. In the mixing valve of the water heater, which is driven in the axial direction, a pair of screw members, one of which moves only in the axial direction and the other rotates only around the axis, is disposed in the screw mechanism portion, and moves in the axial direction. A non-rotational stopper is protruded in the axial direction on the screwing member on the side to be rotated, and a rotational stopper that rotates with the screwing member is provided on the screwing member on the side rotating around the axis, and moves forward and backward in the axial direction. When the screw member on the side moves, A mixing valve for a hot water supply device, wherein the rotation stopper comes into contact with the non-rotation stopper in a rotation direction so that a movement range of the valve body drive shaft in an axial direction is regulated. 2. A mixing valve for a water heater according to claim 1, wherein said screw member which advances and retreats only in the axial direction is slidably supported by a shaft arranged in parallel with said screw mechanism. 3. The screw member that advances and retreats only in the axial direction and the screw member that rotates only around the axis are a male screw member and a female screw member that constitute the screw mechanism itself. The mixing valve of the hot water supply apparatus according to 1. 4. The valve body has a valve section for controlling a mixing ratio of hot water and water by rotating around an axis, and a valve section for controlling a tapping flow rate by moving in an axial direction. The mixing valve of the hot water supply device according to claim 1, 2 or 3.