JP2008045588A - Hot water and cold water mixing valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermostat type hot water and cold water mixing valve using a temperature sensing spring for accurately sensing the temperature of mixed water in a well responsive manner to accurately control the temperature of the mixed water. <P>SOLUTION: The hot water and cold water mixing valve 10 uses the temperature sensing spring 34 as a shape memorizing alloy coil spring. Herein, an outer periphery passage 38 and an inner periphery passage 36 are formed on the outer periphery side of the temperature sensing spring 34 for the mixed water to flow to the axial direction and on the inner periphery side thereof for the mixed water to flow to the axial direction, respectively. At a site on the upstream side beyond the upstream side axial end of the temperature sensing spring 34, a spacer 80 is provided which has a cutout 92 as a dividing passage for making the outer periphery passage 38 communicate with the inner periphery passage 36 to divide the mixed water into the inner periphery passage 36 and the outer periphery passage 38 at the upstream site beyond the temperature sensing spring 34. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a thermostat type hot / cold water mixing valve, and more particularly, to a thermostatic spring using a temperature-sensitive spring for sensing the temperature of the mixed water.

  Conventionally, as a thermostat type hot and cold water mixing valve that automatically adjusts the mixed water to a set temperature, (b) the inlet of water and hot water, and (b) the amount of water flowing in from the water inlet by moving the position, and from the hot water inlet A mixing valve body that adjusts the temperature of the mixed water by changing the ratio with the amount of hot water inflow, (c) a temperature sensing spring chamber formed between the water inlet and the hot water inlet and the mixed water outlet, (D) The mixing valve is housed in the temperature-sensitive spring chamber and senses the temperature of the mixed water and increases the urging force when the temperature of the mixed water is higher than the set temperature to lower the temperature of the mixed water. A temperature-sensitive spring consisting of a coil spring that moves the body and moves the mixing valve body in a direction to increase the temperature of the mixed water by decreasing the biasing force when the temperature is low, and (e) biasing by the temperature-sensitive spring A bias spring that biases the mixing valve body in a direction opposite to the direction is known.

For example, Patent Document 1 listed below discloses this type of thermostatic hot and cold water mixing valve.
FIG. 6 shows a specific example.
In the figure, 200 is a casing, 202 and 204 are a water inlet and a hot water inlet, respectively, and 206 is a mixing valve body.
The water and hot water flowing in from the water inlet 202 and the hot water inlet 204 are mixed, and the mixed water flows out from the outlet 210 rightward in the figure.
Then, the mixing valve body 206 changes the opening degree of the water inlet 202 and the hot water inlet 204 by moving the position from side to side in the figure, so that the amount of water inflow from the water inlet 202 and the hot water from the hot water inlet 204 are changed. Change the ratio with the inflow.

Reference numeral 208 denotes a temperature-sensitive spring chamber, in which a temperature-sensitive spring 212 made of a shape memory alloy compression coil spring is arranged, and the mixing valve body 206 is urged leftward in the figure by the temperature-sensitive spring 212. Yes.
This temperature-sensitive spring 212 changes the urging force in the left direction in the figure according to the temperature of the mixed water.
That is, when the temperature of the mixed water becomes higher than the set temperature, the urging force is increased and the mixing valve body 206 is slightly moved to the left in the figure to widen the opening of the water inlet 202 while opening the hot water inlet 204. Narrow the degree. That is, the amount of water inflow is increased and the amount of hot water inflow is decreased.

  On the other hand, when the temperature of the mixed water is lower than the set temperature, the urging force to the mixing valve body 206 is reduced, and the mixing valve body 206 is moved slightly to the right in the figure to narrow the opening of the water inlet 202. On the other hand, the opening of the hot water inlet 204 is widened to reduce the amount of inflow of water and to increase the amount of inflow of hot water.

Reference numeral 214 denotes a rotation operation shaft, and a rotation handle 216 is attached to an end portion.
The rotation operation shaft 214 has a cylindrical portion 218. A female screw is formed on the inner peripheral surface of the cylindrical portion 218, and a male screw on the outer peripheral surface of the advance / retreat member 220 is screwed there.

The advancing / retracting member 220 shifts the position of the mixing valve body 206 in the left-right direction in the figure by changing the urging force of the first bias spring 222 and the second bias spring 224 made of a normal metal compression coil spring.
Specifically, when the advancement / retraction member 220 is moved in the pushing direction (right direction in the figure) by the rotation of the rotation operation shaft 214, the first bias spring 222 and the second bias spring 224 are compressed to increase the biasing force. The balance between the thermal spring 212 and the biasing force of the first bias spring 222 and the second bias spring 224 is broken, that is, the biasing force of the first bias spring 222 and the second bias spring 224 overcomes the biasing force of the temperature sensitive spring 212. Thus, the mixing valve body 206 is shifted to the right in the figure from the balanced position.

  The mixing valve body 206 changes the opening degree of the water inlet 202 and the hot water inlet 204 based on the temperature sensing operation by the temperature sensing spring 212 at the shift position, and adjusts the mixing ratio of the water inflow amount and the hot water inflow amount. The temperature of the mixed water flowing out from the outlet 210 is automatically adjusted to the set temperature.

However, in the conventional hot and cold water mixing valve shown in FIG. 6, the surface on the outer peripheral side of the temperature sensitive spring 212 is substantially in contact with the inner peripheral surface of the temperature sensitive spring chamber 208. The mixed water exclusively contacts only the inner peripheral surface of the temperature-sensitive spring 212 and does not contact the outer peripheral surface. Therefore, the temperature sensing of the mixed water by the temperature-sensitive spring 212 is dull, and the temperature of the mixed water is controlled. There was a problem that accuracy or responsiveness was insufficient.
However, it is also conventionally known that the outer diameter of the temperature-sensitive spring is smaller than the inner peripheral surface of the temperature-sensitive spring chamber, and an annular space is formed on the outer peripheral side of the temperature-sensitive spring.

However, even in such a case, with the conventional hot and cold water mixing valve, it is difficult for the mixed water to flow from the inner peripheral side to the outer peripheral side of the temperature-sensitive spring, and therefore there is a space on the outer peripheral side of the temperature-sensitive spring. There is a problem that the temperature sensing of the mixed water by the temperature sensitive spring is insufficient.
Such a tendency is particularly remarkable when the temperature-sensitive spring 212 is contracted in the axial direction as shown in FIG.

  Specifically, when the temperature of the mixed water is in the low temperature range, the temperature-sensitive spring 212 made of a compression coil spring is in a state of contracting in the axial direction as compared to when it is in the high temperature range shown in FIG. The axial spacing of each winding (winding) is narrow, so when mixed water flows in the direction indicated by the arrow in the figure, the mixed water passes from the inner circumference side to the outer circumference side through the gap between the windings. It becomes difficult to flow.

As a result, the temperature sensing spring 212 as a whole is not sensitive enough to sense the temperature of the mixed water, and the change in the biasing force does not accurately correspond to the change in the temperature of the mixed water flowing out from the outlet.
And this will reduce the accuracy of temperature control of the mixed water.

JP 2004-85012 A

  The present invention is based on the circumstances as described above, and the temperature of the mixed water can be sensed accurately and with good responsiveness, and the temperature of the mixed water can be controlled with high accuracy. It was made for the purpose of providing a valve.

  Thus, according to the first aspect of the present invention, the ratio of (a) the inlet of water and hot water, and (b) the amount of water flowing in from the water inlet and the amount of hot water flowing in from the hot water inlet by position movement, A mixing valve body that adjusts the temperature of the mixed water by changing; (c) a temperature-sensitive spring chamber formed between the water inlet and the hot water inlet and the mixed water outlet; The mixing valve is accommodated in a temperature spring chamber, senses the temperature of the mixed water and increases the urging force when the temperature of the mixed water is higher than a set temperature to lower the temperature of the mixed water. A temperature-sensitive spring that moves the body and moves the mixing valve body in a direction to increase the temperature of the mixed water by decreasing the biasing force when the temperature is on the low temperature side; and (e) a biasing direction by the temperature-sensitive spring; A hot spring mixing valve for automatically adjusting the mixed water to a set temperature, the bias spring biasing the mixing valve body in the reverse direction An outer peripheral passage for flowing the mixed water in the axial direction of the temperature-sensitive spring on the outer peripheral side of the temperature-sensitive spring, and an inner peripheral side of the temperature-sensitive spring, with a spring having a smaller diameter than the inner peripheral surface of the temperature-sensitive spring chamber An inner peripheral passage for flowing the mixed water in the axial direction, and the outer peripheral passage and the inner peripheral passage in a state where the outer peripheral passage and the inner peripheral passage are communicated with a portion upstream of the upstream shaft end of the temperature-sensitive spring. And dividing means for dividing the mixed water into the inner peripheral passage and the outer peripheral passage at a portion upstream from the upstream shaft end.

  According to a second aspect of the present invention, in the first aspect, the dividing unit is provided between a joining portion of water from the water inlet and hot water from the hot water inlet and an upstream shaft end of the temperature sensing spring. It has a spacer part which ensures the space | interval of an axial direction, and it is characterized by providing a division channel | path in this spacer part.

  According to a third aspect of the present invention, in the second aspect of the present invention, the spacer portion has a mixed water passage connected to the inner peripheral passage on the inner side, and the spacer portion includes the inner peripheral passage and the outer peripheral passage at a plurality of locations in the circumferential direction. A notch in the radial direction that communicates with each other is formed over a predetermined axial length, and the notch forms the divided passage.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, in the third aspect, the spacer portion includes a cylindrical guide portion that guides the flow of the mixed water divided toward the outer peripheral passage in the axial direction, and the outer peripheral end of the notch. The temperature-sensitive spring is provided so as to extend further downstream than the upstream shaft end of the temperature-sensitive spring.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the mixed water from the outer peripheral passage is caused to flow out in addition to the inner outlet from which the mixed water from the inner peripheral passage flows out as the outlet. The outer outlet is provided at a position on the outer peripheral side of the temperature-sensitive spring.

Effects and effects of the invention

  As described above, according to the present invention, the outer peripheral passage for flowing the mixed water in the axial direction of the temperature-sensitive spring is mixed on the outer peripheral side of the temperature-sensitive spring including the compression coil spring housed in the temperature-sensitive spring chamber, and the inner peripheral side is mixed. In addition to forming an inner circumferential passage for flowing water in the axial direction, a flow dividing means for dividing the mixed water into an inner circumferential passage and an outer circumferential passage at the upstream portion of the upstream side of the upstream shaft end of the temperature-sensitive spring. According to the present invention, not only the inner peripheral surface of the temperature-sensitive spring but also the outer peripheral surface, that is, the temperature-sensitive spring can be brought into contact with the mixed water as a whole.

  As a result, the temperature detected by the temperature sensitive spring accurately corresponds to the temperature of the mixed water flowing out from the outlet. That is, the temperature of the mixed water can be correctly detected by the temperature sensitive spring with good responsiveness, and the temperature of the mixed water can be accurately controlled to the set temperature.

Here, the dividing means has a spacer portion that secures an axial interval between the joining portion of the water from the water inlet and the hot water from the hot water inlet and the upstream shaft end of the temperature-sensitive spring, and the spacer portion. (2).
By doing in this way, mixed water can be divided | segmented into said inner periphery channel | path and outer periphery channel | path favorably in the upstream site | part of a temperature-sensitive spring, and can be distributed.
Here, the spacer portion can be provided separately from the mixing valve body, but it is desirable that the spacer portion be configured integrally with the mixing valve body.
In this way, the number of required parts can be reduced.

The spacer portion has a mixed water passage connected to the inner peripheral passage on the inner side, and radial notches for communicating the inner peripheral passage and the outer peripheral passage at a plurality of locations in the circumferential direction of the spacer portion with a predetermined axis. It can be formed over a length, and the dividing passage can be formed by the notch (Claim 3).
In this case, the mixed water of the water flowing in from the water inlet and the hot water flowing in from the hot water inlet is well divided into the inner peripheral passage and the outer peripheral passage of the temperature-sensitive spring through the notch.
Further, by configuring the dividing means in this way, it is possible to configure the dividing means with a simple structure.

  Next, according to a fourth aspect of the present invention, a cylindrical guide portion for guiding the flow of the mixed water divided on the outer peripheral passage side in the axial direction is provided upstream of the temperature-sensitive spring at the spacer portion and at the outer peripheral end of the notch. According to the fourth aspect of the present invention, the flow of mixed water divided in the radial direction on the side of the outer peripheral passage is adjusted to an axial flow so that the outer peripheral passage is provided. The flow of the mixed water in the temperature-sensitive spring chamber can be smoothly made an axial flow, and the flow of the mixed water divided on the outer peripheral passage side is the upstream shaft of the temperature-sensitive spring. By causing the turbulence near the end, it is possible to satisfactorily avoid hindering the smooth mixed water flow in the outer peripheral passage.

  Next, in addition to the inner outlet from which the mixed water from the inner peripheral passage flows out as the outlet, the outer outlet from which the mixed water from the outer peripheral passage flows out is provided on the outer peripheral side of the temperature sensitive spring. According to the fifth aspect of the present invention, the axial flow of the mixed water in the outer peripheral passage can be generated more smoothly, and the temperature sensing responsiveness and sensing accuracy of the mixed water by the temperature sensitive spring can be generated. Can be further increased.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
1-3, 10 is a hot and cold mixing valve, and 12 is its casing.
The casing 12 includes a first member 14 on the left side and a second member 16 on the right side in the drawing.
Here, the first member 14 and the second member 16 are provided at the female screw portion 18 (see FIG. 3) formed at the right end portion of the first member 14 in the drawing and at the left end portion of the second member 16 in the drawing. It is screwed in the axial direction by the male screw portion 20.

  The casing 12 is provided with a water inlet 22 and a hot water inlet 24 at an interval in the axial direction, and water and hot water are introduced into the casing 12 through the water inlet 22 and the hot water inlet 24.

Reference numeral 26 denotes a mixing valve body that adjusts the temperature of the mixed water by changing the ratio of the amount of water inflow from the water inlet 22 and the amount of hot water inflow from the hot water inlet 24 by moving the position in the axial direction. A valve portion 28 is provided.
The valve portion 28 is fitted to the inner peripheral surface of the casing 12 so as to be slidable by a small distance in the axial direction, and the outer peripheral surface and the inner peripheral surface of the casing 12 are watertightly sealed by an O-ring 29 at an intermediate position in the axial direction. Has been.

Here, the valve portion 28 has a water side valve portion 28A on the left end side in the drawing and a hot water side valve portion 28B on the right end side, and the water side valve portion 28A and the hot water side valve portion 28B are connected to the water inlet 22, The opening degree of the hot water inlet 24 is changed simultaneously and in the opposite directions.
The water and hot water flowing in from the water side valve portion 22 and the hot water side valve portion 24 are merged and mixed in the merging portion 30 inside the valve portion 28, the mixed water flows in the left direction in the figure, and the temperature sensitivity It passes through the spring chamber 32 while being further mixed, and flows leftward from the outlet 40 at the left end in the figure.

The temperature-sensitive spring chamber 32 has a circular cross-sectional shape, and a temperature-sensitive spring 34 made of a compression memory spring made of a shape memory alloy is accommodated therein.
The mixing valve body 26 is urged rightward in the figure by the temperature sensitive spring 34.
This temperature-sensitive spring 34 changes the urging force in the right direction in the figure according to the temperature of the mixed water. That is, when the temperature of the mixed water becomes higher than the set temperature, the urging force is increased and the mixing valve body 26 is slightly moved rightward in the drawing to widen the opening of the water inlet 22 while the opening of the hot water inlet 24 is increased. To narrow.
That is, the amount of water inflow is increased and the amount of hot water inflow is decreased.

  On the other hand, when the temperature of the mixed water is lower than the set temperature, the urging force on the mixing valve body 26 is reduced to slightly move the mixing valve body 26 leftward in the drawing, thereby narrowing the opening of the water inlet 22. The opening of the hot water inlet 24 is widened to reduce the water inflow amount and increase the hot water inflow amount.

In this embodiment, the temperature-sensitive spring 34 has a smaller diameter than the inner peripheral surface of the temperature-sensitive spring chamber 32, and an inner peripheral passage 36 for flowing the mixed water in the axial direction is formed on the inner side, and the outer peripheral side More specifically, an outer peripheral passage 38 for flowing mixed water in the axial direction is formed between the inner peripheral surface of the temperature-sensitive spring chamber 32.
Correspondingly, the outlet 40 at the axial end of the casing 12 is provided with an outer outlet through which the mixed water from the outer peripheral passage 38 flows out in addition to the inner outlet 42 through which the mixed water from the inner peripheral passage 36 flows out. 44.
Here, the inner outlet 42 has a circular opening having an inner diameter substantially equal to the inner diameter of the temperature-sensitive spring 34, and the outer outlet 44 has an arc shape extending in the circumferential direction as shown in FIG. It is formed with a notch.

The casing 12 has a cylindrical shape as a whole, and the second member 16 forming a part thereof has a bottom at the right end in the figure, and a fitting hole 52 is formed at the center of the bottom. The fitting portion 50 of the rotation operation shaft 46 is fitted in a rotatable manner.
Here, the fitting portion 50 and the fitting hole 52 of the rotary operation shaft 46 are sealed in a watertight manner by an O-ring 54.

The rotation operation shaft 46 is provided with a serration portion 48 at the right end portion in the figure protruding from the casing 12, and a rotation handle (not shown) is coupled to the rotation operation shaft 46 in an integrally rotated state.
The rotation operation shaft 46 is inserted to the inside of the casing 12, and a male screw 60 is provided on the outer peripheral surface of the insertion portion.

An annular advance / retreat member 56 is also accommodated in the casing 12 so as to be movable in the axial direction (left-right direction in the figure).
A female screw 58 is formed on the inner peripheral surface of the advance / retreat member 56, and a male screw 60 of the rotary operation shaft 46 is screwed to the female screw 58.
Based on the screwing, the advancing / retracting member 56 is moved forward by the screw operation by the rotational operation of the rotation operation shaft 46 or moved backward by the screw in the drawing.

The advancement / retraction member 56 is provided with an engagement groove 62 for preventing rotation at a predetermined position in the circumferential direction along the axial direction, and a corresponding engagement provided on the casing 12 side in the engagement groove 62. The protrusion 64 is engaged.
The advance / retreat member 56 is moved forward and backward in the axial direction while being prevented from rotating by the engagement action of the engagement groove 62 and the engagement protrusion 64.

The advancing / retracting member 56 is provided with a cylindrical protruding portion 66 rising in the axial direction on the left end side and the outer peripheral portion in the drawing, and a concave portion 68 is formed inside thereof, and a bias made of a metal and a compression coil spring is formed therein. The shaft end (the shaft end on the right side in the drawing) of the spring 70 is seated with the bottom surface of the recess 68 as the seating surface.
That is, the left end portion of the advance / retreat member 56 in the drawing is configured as a spring receiver that receives the shaft end of the bias spring 70.

Here, the bias spring 70 is housed in a bias spring chamber 72 formed inside the casing 12, and the shaft end on the left side in the drawing is in contact (sitting) with the mixing valve body 26.
The bias spring 70 applies a biasing force to the mixing valve body 26 in a direction opposite to the biasing direction by the temperature-sensitive spring 34.

Therefore, in the hot water / water mixing valve 10, if the advancement / retraction member 56 is moved in the pushing direction (left direction in the figure) by the rotation of the rotation operation shaft 46, the bias spring 70 is compressed to increase the urging force. The balance with the urging force by the temperature spring 34 is broken, that is, the urging force of the bias spring 70 overcomes the urging force of the temperature sensing spring 34, and the mixing valve body 26 is shifted from the balanced position to the left in the figure.
The mixing valve body 26 changes the opening degree of the water inlet 22 and the hot water inlet 24 based on the temperature sensing operation by the temperature sensing spring 34 at the shift position, and adjusts the mixing ratio of the water inflow amount and the hot water inflow amount. Then, the temperature of the mixed water flowing out from the outlet 40 is automatically adjusted to the set temperature.

As shown in FIG. 4, the mixing valve body 26 integrally has an arm 74 inside a cylindrical valve portion 28.
Here, the arm 74 includes a radial arm 76 that extends in a cross shape as a whole, and an axial arm 78 that extends in the axial direction at each tip of the radial arm 76, and the radial arm. The left shaft end of the bias spring 70 is in contact (sitting) with respect to 76.
A spacer portion 80 is integrally formed on the left end side of the axial arm 78 in the drawing.

The spacer portion 80 ensures an axial interval over a predetermined axial length between the merging portion 30 and the upstream shaft end (right shaft end in the figure) of the temperature-sensitive spring 34, and is the outermost periphery. A cylindrical guide part 82 is provided in the part.
The spacer portion 80 is provided with an inward flange portion 84 at the right end of the guide portion 82 in the figure. Inside the flange portion 84, the inside of the merging portion 30 and the temperature sensitive spring 34 is provided. A mixed water passage 86 connected to the inner peripheral passage 36 is formed.

The spacer portion 80 is also integrally provided with a pedestal portion 88 having a predetermined thickness in the radial direction inside a cylindrical guide portion 82.
Here, the pedestal portion 88 has a cylindrical shape as a whole, and has an inner diameter equal to the inner diameter of the inward flange portion 84.
The pedestal part 88 has a part on the outer peripheral side protruding in the axial direction (left direction in the figure), and a part on the inner peripheral side is a seating part 90 having a stepped shape with respect to the protruding part. The upstream shaft end of the temperature-sensitive spring 34 housed in the spring chamber 32 is in contact (sitting).
That is, the spacer portion 80 is configured as a spring receiver that receives the temperature-sensitive spring 34 at the left end portion of the pedestal portion 88 in the drawing.
A space is secured over a predetermined axial length between the upstream shaft end of the temperature-sensitive spring 34 and the merging portion 30 by the pedestal portion 88 in the spacer portion 80.

The pedestal portion 88 has a radial notch 92 that communicates the inner peripheral passage 36 and the outer peripheral passage 38 in the temperature-sensitive spring chamber 32, spanning the inner peripheral passage 36 and the outer peripheral passage 38, and in the circumferential direction. Are provided at predetermined intervals.
This notch 92 serves as a divided passage that divides and distributes the mixed water from the merging portion 30 into an inner peripheral passage 36 and an outer peripheral passage 38 at a portion upstream from the upstream shaft end of the temperature-sensitive spring 34. In order to divide the mixed water satisfactorily, it is formed over a predetermined axial length on the upstream side of the temperature-sensitive spring 34.

The cylindrical guide part 80 provided in the spacer part 80 extends in the axial direction at the position of the outer peripheral end of the notch 92, and the tip part (left end part in the figure) of the temperature-sensitive spring 34 is extended. It extends to the downstream side from the upstream shaft end.
The guide portion 82 serves to guide the flow of one (outer peripheral side) of the mixed water divided in the radial direction by the notch 92 as an axial flow to the outer peripheral passage 88. FIG. As shown in FIG. 2, the inner diameter of the casing 12 is substantially equal to the inner diameter of the small-diameter portion 94 at the left end in the drawing.
In the present embodiment, the dividing means is constituted by the spacer portion 80 provided with the notch 92 that forms the dividing passage.

In the hot / cold water mixing valve 10 of this embodiment, as shown in FIG. 5, the water flowing in from the water inlet 22 and the hot water flowing in from the hot water inlet 24 merge and mix at the merging portion 30, To flow into.
In the course of the mixed water passing through the spacer portion 80, a part of the mixed water is divided into flows on the outer peripheral side by the notches 92.

That is, a part of the mixed water flows to the left in the figure through the inner peripheral passage 36 formed inside the temperature-sensitive spring 34 as it is, and the other part is divided by the notch 92 to be divided into the temperature-sensitive springs. 34 flows in the axial direction through the outer peripheral passage 38 formed on the outer peripheral side of the main body 34.
And each mixed water which distribute | circulated the inner peripheral channel | path 36 and the outer peripheral channel | path 38 flows out from the terminal outlet 40. FIG. Specifically, the mixed water from the inner peripheral passage 36 flows out to the left in the figure through the inner outlet 42, and the mixed water from the outer peripheral passage 38 flows out to the left in the figure through the outer outlet 44.

  Part of the mixed water flowing through the inner peripheral passage 36 flows from the gap between the windings of the temperature-sensitive spring 34 to the outer peripheral passage 38, and part of the mixed water flowing through the outer peripheral passage 38 is also the temperature-sensitive spring 34. May flow into the inner peripheral passage 36 through a gap between the windings.

  In the hot / cold water mixing valve 10 of the present embodiment, the axial flow of the mixed water is favorably generated not only on the inner peripheral side of the temperature-sensitive spring 34 but also on the outer peripheral side. The entire surface including not only the inner peripheral surface but also the outer peripheral surface is exposed to the flow of the mixed water, and the temperature of the mixed water can be sensed with high responsiveness and sensitivity with high accuracy.

  Further, in the present embodiment, the mixed water in the outer peripheral passage 38 of the temperature sensing spring 34 flows smoothly in the axial direction and is constantly and quickly renewed, so that the temperature sensed by the temperature sensing spring 34 flows out from the outlet 40. Thus, the temperature of the mixed water can be accurately sensed by the temperature sensing spring 34 with high responsiveness, and the temperature of the mixed water can be accurately controlled to the set temperature by the mixing valve body 26. Is possible.

Furthermore, in the present embodiment, since the guide portion 82 as described above is provided in the spacer portion 80, the flow of the mixed water divided on the side of the outer peripheral passage 38 is adjusted to flow in the axial direction and flows into the outer peripheral passage 38. The axial flow of the mixed water in the temperature-sensitive spring chamber 32 can be smoothed as a whole.
Further, the flow of the mixed water divided in the radial direction toward the outer peripheral passage 38 is disturbed in the vicinity of the upstream shaft end of the temperature-sensitive spring 34, so that the smooth mixed water flow in the outer peripheral passage 38 is inhibited. Can be avoided well.

  In addition, in the present embodiment, in addition to the inner outlet 42 through which the mixed water from the inner peripheral passage 36 flows out, the outer outlet 44 through which the mixed water from the outer peripheral passage 38 flows out is provided on the outer peripheral side of the temperature-sensitive spring 36. Therefore, the axial flow of the mixed water in the outer peripheral passage 38 can be generated more smoothly, and the responsiveness and accuracy of temperature detection of the mixed water by the temperature sensitive spring 34 can be further improved. it can.

  Although the embodiment of the present invention has been described in detail above, this is merely an example, and the present invention can be configured in various forms without departing from the spirit of the present invention.

It is sectional drawing of the hot and cold water mixing valve which is one embodiment of the present invention. It is a notch perspective view of the hot water mixing valve of the embodiment. It is sectional drawing which decomposes | disassembles and shows the hot / cold water mixing valve of the embodiment. It is a perspective view of the mixing valve body of the hot water mixing valve of the embodiment. It is operation | movement explanatory drawing of the hot water mixing valve of the embodiment. It is sectional drawing which shows an example of the conventional hot water mixing valve. It is explanatory drawing for demonstrating the malfunction of the conventional hot water mixing valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Hot water mixing valve 22 Water flow inlet 24 Hot water flow inlet 26 Mixing valve body 30 Junction part 32 Temperature sensing spring chamber 34 Temperature sensing spring 36 Inner circumference passage 38 Outer circumference passage 40 Outlet 42 Inner outlet 44 Outer outlet 70 Bias spring 80 Spacer Part 82 Guide part 92 Notch (Division path)

Claims (5)

(B) With water and hot water inlet
(B) a mixing valve body that adjusts the temperature of the mixed water by changing the ratio of the amount of water inflow from the water inlet and the amount of hot water inflow from the hot water inlet by moving the position;
(C) a temperature-sensitive spring chamber formed between the water inlet and the hot water inlet and the mixed water outlet;
(D) Housed in the temperature-sensitive spring chamber, sense the temperature of the mixed water, and increase the urging force when the temperature of the mixed water is higher than the set temperature to lower the temperature of the mixed water A temperature-sensitive spring that moves the mixing valve body in a direction, and moves the mixing valve body in a direction to increase the temperature of the mixed water by decreasing the biasing force when the temperature is low.
(E) a hot and cold water mixing valve that includes a bias spring that biases the mixing valve body in a direction opposite to the biasing direction of the temperature sensitive spring, and automatically adjusts the mixed water to a set temperature. The outer diameter passage is made smaller in diameter than the inner circumferential surface of the temperature-sensitive spring chamber, and the mixed water is flowed in the axial direction of the temperature-sensitive spring on the outer circumference side of the temperature-sensitive spring, and the inner diameter side of the temperature-sensitive spring. An inner peripheral passage for flowing water in the axial direction is formed, and the outer peripheral passage and the inner peripheral passage are connected in a state where the outer peripheral passage and the inner peripheral passage are communicated with a portion upstream of the upstream shaft end of the temperature-sensitive spring. A hot water / water mixing valve provided with a dividing means provided across the passage and dividing the mixed water into the inner peripheral passage and the outer peripheral passage at a location upstream of the upstream shaft end.   In Claim 1, the said division | segmentation means ensures the space | interval of an axial direction between the confluence | merging part of the water from the said water inlet, and the hot water from the said hot water inlet, and the upstream axial end of the said temperature sensing spring. A hot and cold water mixing valve characterized by having a spacer portion and providing a dividing passage in the spacer portion.   3. The spacer according to claim 2, wherein the spacer portion has a mixed water passage connected to the inner peripheral passage on the inner side, and the spacer portion has a radial cut that communicates the inner peripheral passage and the outer peripheral passage at a plurality of locations in the circumferential direction. A hot and cold water mixing valve, wherein a notch is formed over a predetermined axial length, and the notch forms the divided passage.   The cylindrical spacer for guiding the flow of the mixed water divided toward the outer peripheral passage in the axial direction is provided in the spacer portion at the position of the outer peripheral end of the notch. The hot and cold water mixing valve is provided so as to extend further downstream than the upstream shaft end.   In any one of Claims 1-4, in addition to the inner side outflow port which flows out the mixed water from the said inner periphery channel | path as an said outflow port, the outer side outflow port which flows out the mixed water from the said outer periphery channel | path is the said temperature sensing. A hot and cold water mixing valve provided at a position on the outer peripheral side of the spring.

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