JP5004675B2 - Mixing valve - Google Patents

Description

  The present invention relates to a mixing valve, and more particularly to a mixing valve suitable for use in a hot water supply apparatus or the like for mixing hot water and hot water to obtain hot water having a desired mixing ratio.

  Conventionally, this type of mixing valve includes a valve body, a substantially cylindrical valve body that is rotatably fitted in the valve body, and a drive unit that rotates the valve body. A water introduction port (joint) and a hot water introduction port (joint) are provided in the main body, and a first water-use inlet is provided on the peripheral wall portion of the valve body to continuously change the opening area of the water introduction port and the hot water introduction port. There is known a mixing valve that is provided with an opening and a second opening for hot water, so that the mixing ratio of water and hot water is adjusted by rotating the valve body.

  In a hot water supply apparatus using such a mixing valve, tap water is usually branched and one is directly heated to a water inlet, and the other is heated by a heat exchanger (heater), that is, water is changed to hot water. However, due to its configuration, there are the following issues to consider.

  That is, for example, in cold weather when the water used is extremely low, the hot water inlet is fully open, the water inlet is fully closed, and only the hot water heated by the heat exchanger is sent out from the outlet. Since the heating power by the heat exchanger is limited, the obtained hot water may not reach the desired temperature. In addition, for example, in a hot water supply system in which hot water heated using midnight power is stored in a tank, when there is no hot water remaining in the tank, a hot water heater is used. Sometimes it is desirable to quickly raise the temperature of water.

  In such a case, in order to obtain hot water at a desired temperature, the amount of water passing through the heat exchanger may be reduced. However, this requires a flow rate adjustment valve for adjusting the amount of water passing through the heat exchanger, and the cost of the apparatus increases. There are problems such as.

  Therefore, in Patent Documents 1 and 2 below, the mixing valve for adjusting the mixing ratio of water and hot water as described above, with the water introduction port fully closed, The amount of water that can be adjusted (squeezed) is disclosed.

Japanese Patent Laid-Open No. 2002-22039 Japanese Patent Laid-Open No. 11-287337

  However, in the mixing valve described in Patent Document 1, the water inlet and the hot water inlet of the valve main body, and the first opening and the second opening of the valve body are respectively in the hot water flow downward direction (rotating axis of the valve body). The valve is lengthened in the vertical direction, leading to an increase in size (an increase in occupied space including the piping system), an increase in weight, etc., as well as the valve body and valve body, etc. Reduced molding accuracy, increased surface area (contact area) between valve body and valve body, increased load (torque) when rotating the valve body due to uneven contact, etc., increased adverse effects due to foreign matter (operation failure due to clogging etc.) Further, there is a risk of increasing the leakage amount at the deadline due to an increase in clearance.

  In addition, the mixing valve described in Patent Document 2 has a complicated structure of the mixing valve (valve body and valve body) because it is necessary to add a valve seat and a valve body part to the valve body and the valve body. Thus, there is a problem that it takes time and labor for processing and assembly, and the cost of the apparatus increases.

  Therefore, the inventors of the present application can obtain the same functions (mixing function of water and hot water and the function of restricting the amount of hot water) without causing an increase in size, an increase in weight, or the like. The present invention is considering providing the water inlet, the hot water inlet, the first opening, and the second opening on the same plane.

  However, for example, as illustrated in FIG. 9, the water inlet 11 and the hot water inlet 12 are provided in the valve main body 10, and the water inlet 11 and the hot water are provided in the peripheral wall portion 22 of the cylindrical valve body 20, for example. When the first opening portion 31 and the second opening portion 32 having a lateral width (circumferential length) substantially equal to the diameter L of the introduction port 12 are provided on the same plane, water and hot water are used in a normal manner. However, only the amount of hot water is squeezed, that is, while the water inlet 11 is fully closed by the valve body 20, the opening area of the hot water inlet 12 is adjusted according to the rotation angle of the valve body 20. It cannot be changed continuously from maximum to minimum.

  Specifically, as shown in FIG. 9 (A), the position of the valve body 20 where the opening area of the water inlet 11 is the maximum and the opening area of the hot water inlet 12 is the minimum (0 = fully closed). When the valve body 20 is rotated in one direction from the initial position as the initial position, the opening area (flow rate) of the water inlet decreases and the opening area (flow rate) of the hot water inlet increases according to the rotation angle. As shown in (B), the opening area (flow rate) of the water inlet 11 and the hot water inlet 12 is the same, the mixing ratio is 50%: 50%, and the valve body 20 is placed in the same direction. When rotated, as shown in (C), when the valve body 20 is rotated to a predetermined angle Kb, the opening area (flow rate) of the water inlet gradually decreases to 0 (fully closed) and the hot water inlet The opening area (flow rate) gradually increases and becomes the maximum.

  However, from this state, even when the valve body 20 is further rotated in the same direction, as shown in (D), (E), and (F), the water inlet 11 is kept fully closed, as shown in FIGS. The opening area of the inlet 12 cannot be continuously changed from the maximum to the minimum while following the rotation angle of the valve body 20.

  Therefore, the inventors of the present application do not provide the two openings 31 and 32 in the valve body 20 as described above, but only one opening 30 in the valve body 20 as illustrated in FIG. We are considering establishing it.

  However, even when only one opening 30 is provided in the valve body 20 as described above, it is not possible to add a hot water amount throttling function in addition to a water / hot water mixing function for the following reasons. Can not.

  That is, when the water inlet 11 and the hot water inlet 12 are arranged opposite to each other on the same plane, the characteristics of the mixing valve are that the outer diameter d of the valve body 20 and the inner diameter D of the valve body 10 (d and D are substantially omitted). Equal), the opening width h of the opening 30, the opening width H of the water inlet 11, and the opening width H ′ of the hot water inlet 12.

Now, one end side edge of the water inlet 11 and the hot water inlet 12 is P, Q, the other end is R, S, and the angle between PQ along the rotation direction of the valve body 20. If the (occlusion width) is A and the angle between RS along the rotation direction of the valve body 20 (occlusion width) is B, the angle B is set to the opening width h to obtain a mixing function. It is necessary to be smaller than the corresponding angle C.
Condition (1) ... B <C

In addition, in order to add the hot water amount drawing function, the angle A needs to be larger than the angle C corresponding to the opening width h.
Condition (2) ... A> C

  However, when the water inlet 11 and the hot water inlet 12 are opposed to each other on the same plane as in the illustrated example, A = B. Therefore, the above conditions (1) and (2) cannot be satisfied at the same time. Therefore, in addition to the mixing function of water and hot water, the hot water amount throttling function cannot be added.

  The present invention has been made in view of the above circumstances, and the object thereof is not to increase the size, increase the weight, decrease the molding accuracy, etc., and increase the rotational load, increase the malfunction, and leak. Water and hot water can be mixed quickly and accurately without causing an increase in volume, etc., and hot water (only) can be obtained with the water inlet fully closed. The object is to provide a compact, inexpensive and useful mixing valve that can be reasonably throttled.

  In order to achieve the above object, the mixing valve according to the present invention is basically provided with a water inlet and a hot water inlet on substantially the same plane, and downstream of the water inlet and the hot water inlet. In order to continuously change the opening area of the water inlet and the hot water inlet on the peripheral wall portion according to the rotation angle And a substantially cylindrical valve body provided with an opening.

Then, together with the water inlet and hot water inlet is opposed at an angular interval of 180 degrees, their center lines are brought eccentric by a predetermined distance to the rotational axis of the valve body.

Further , the position of the valve body where the opening area of the water introduction port is the maximum and the opening area of the hot water introduction port is the minimum is set as the initial position, and the valve body is rotated in a direction by a predetermined angle from the initial position. And the opening area of the water inlet gradually decreases to zero, and the opening area of the hot water inlet gradually increases to the maximum. From this state, when the valve body is further rotated in the same direction, the water introduction It is characterized in that the opening area of the hot water inlet is gradually reduced to a minimum while the mouth is fully closed.

  In the mixing valve according to the present invention, the water inlet and the hot water inlet are opposed to each other with an angular interval of 180 degrees, and their center lines are decentered by a predetermined distance with respect to the rotation axis of the valve body. Therefore, the angle A is larger than the angle B (see FIG. 3 described later), and B <C of the condition (1) and A> C of the condition (2) can be satisfied at the same time. .

  For this reason, water and hot water can be mixed quickly without causing an increase in size, an increase in weight, a decrease in molding accuracy, etc., and without causing an increase in rotational load, an increase in malfunction, an increase in leakage, etc. Hot water with the desired temperature and flow rate can be obtained accurately, and the amount of hot water (only) can be rationally reduced with the water inlet fully closed, resulting in a compact, inexpensive and useful mixing valve Can be provided.

Hereinafter, embodiments of the mixing valve of the present invention will be described with reference to the drawings.
FIG. 1 is a partially cutaway longitudinal sectional view showing an embodiment of a mixing valve according to the present invention.
The mixing valve 1 of the illustrated embodiment is used in, for example, a hot water supply device for mixing hot water and hot water to obtain hot water having a desired temperature, and has a valve chamber 14 having a circular cross section. A valve body 10 provided with a water introduction port (joint) 11 and a hot water introduction port (joint) 12 connected to the side of the valve chamber 14 and provided with an outlet port (joint) 13 connected to the lower part of the valve chamber 14; The valve body 20 is inserted into the valve chamber 14 of the valve body 10 and is rotatable about the rotation axis O, and a stepping motor (not shown) is provided as a driving means for rotating the valve body 20. .

  The water introduction port 11 and the hot water introduction port 12 have the same diameter and are opposed to each other with an angular interval of 180 degrees on the same plane, as shown in FIG. 2, FIG. 3, and FIG. These center lines Ca are decentered by a predetermined distance e with respect to the center line of the valve chamber 14, that is, the rotation axis O of the valve body 20. In addition, the outlet 13 (center line thereof) is also eccentric with respect to the rotation axis O by a predetermined distance e.

  A stirring portion 40 for promoting the mixing of hot water and water is integrally provided below the center line Ca in the valve body 10 (lower part of the valve chamber 14 and upper part of the outlet 13). As can be understood by referring to FIG. 2 (horizontal sectional view of the valve body 10) in addition to FIG. 1, the stirring unit 40 is a circle disposed on the center line (rotational axis O) of the valve chamber 14. The columnar part 42, three rectangular connecting plate parts 43 arranged at intervals of 120 degrees that connect the lower part of the cylindrical part 42 and the inner wall of the inlet 13, and the outer periphery of the cylindrical part 42 The three protruding plate portions 44 connected to the upper portion of the connecting plate portion 43 are provided. The three projecting plate portions 44 are projected radially from the cylindrical portion 42 at an angular interval of 120 degrees, and the projecting length in the radial direction is a triangular shape in a right-angled view as viewed from the side. The bottom side reaches the inner peripheral surface of the valve chamber 14. The columnar portion 42 is formed with a hole 46 into which a lower portion of a valve body support shaft 38 to be described later is fitted.

  On the other hand, as shown in FIG. 5, the valve body 20 has a substantially cylindrical shape with a ceiling portion, and the peripheral wall portion 22 functions as a seal surface portion that closes the water inlet 11 and the hot water inlet 12. In addition, a single opening 30 having a rectangular shape in a side view is provided in the peripheral wall portion 22 so as to continuously change the opening areas of the water inlet 11 and the hot water inlet 12 according to the rotation angle of the valve body 20. ing.

  In addition, a rotary connecting shaft 25 projects from the center of the upper surface of the ceiling portion 23 of the valve body 20. In the lower part of the rotary connecting shaft 25, a groove comprising a three-stage bowl-shaped part 28 to which O-rings 29 and 29 (FIG. 1) are attached is provided, and an upper part thereof can be rotated integrally with the stepping motor. A spline shaft portion 26 for connection and a convex portion 27 having a non-circular cross section (D cut shape or the like) are provided. In addition, a groove 36 in which a ring-shaped elastic seal member 39 (FIG. 1) for sealing between the inner periphery of the valve chamber 14 is mounted is provided in the lower part of the valve body 20.

  A bearing 16 that rotatably supports the ceiling portion 23 of the valve body 20 and the lower portion of the rotary connecting shaft 25 (portions where the O-rings 29 and 29 are mounted) is fixed to the upper portion of the valve body 10. The stepping motor is mounted on the top via a mounting plate.

  In addition, a hole 37 in which the upper portion of the valve body support shaft 38 is press-fitted and fixed is provided in the upper center of the valve body 20 including the rotary connecting shaft 25, and the lower portion of the valve body support shaft 38 is formed in the cylindrical portion 42. Is rotatably inserted in a hole 46 provided in.

  Here, in the mixing valve 1 of the present embodiment, the water introduction port 11 and the hot water introduction port 12 are arranged to face each other with an angular interval of 180 degrees, and their center line Ca is set to the rotation axis O of the valve body 20. On the other hand, since it is decentered by a predetermined distance e, a hot water amount throttling function can be added in addition to the water and hot water mixing function.

  That is, as shown in FIG. 8 described above, in the mixing valve 1 of the present embodiment, as shown in FIG. 3, the outer diameter d of the valve body 20 and the inner diameter D (d and D of the valve body 10). Are substantially equal to each other), the opening width h of the opening 30, the opening width H of the water introduction port 11, and the opening width H ′ of the hot water introduction port 12, and one end side of the water introduction port 11 and the hot water introduction port 12. The edge part is P, Q, the edge part on the other end side is R, S, the angle (blocking width) between P-Q along the rotation direction of the valve body 20 is A, and the rotation direction of the valve body 20 is In addition, if the angle between R and S (blocking width) is B, the center line Ca of the water inlet 11 and the hot water inlet 12 is decentered by a predetermined distance e with respect to the rotational axis O of the valve body 20. As a result, the angle (blocking width) A becomes larger than the angle (blocking width) B, and B <C in the above condition (1) and A> C in the condition (2) are satisfied simultaneously. So that it is, as a result, it is possible to combine both the mixing function of the water and the hot water and the hot water stop function.

  Actually, under such a configuration, for example, as shown in FIG. 6 (A), the opening area of the water inlet 11 is maximum (fully open) and the opening area of the hot water inlet 12 is minimum (0 = When the position of the valve body 20 that is fully closed) is the initial position and the valve body 20 is rotated in one direction (clockwise) from the initial position, the opening area (flow rate) of the water inlet 11 and hot water introduction The opening area (flow rate) of the mouth 12 changes as shown in the schematic diagram of FIG. That is, as shown in FIG. 6B, the opening area (flow rate) of the water inlet 11 decreases and the opening area (flow rate) of the hot water inlet 12 increases according to the rotation angle from the initial position. As shown in FIG. 6B, when the rotation angle reaches a predetermined angle Ua, the flow rates of water and hot water are the same, the mixing ratio becomes 50%: 50%, and the valve body 20 is rotated to the predetermined angle Ub. Then, as shown in FIG. 6C, the opening area (flow rate) of the water inlet 11 gradually decreases to 0 (fully closed), and the opening area (flow rate) of the hot water inlet 12 increases gradually. And become the maximum.

  From this state, when the valve body 20 is further rotated beyond the predetermined angle Ub to the predetermined angle Uc, as shown in FIGS. 6D and 6E, the water inlet 11 is fully closed. In the state, the opening area (flow rate) of the hot water inlet 12 continuously changes from the maximum to the minimum while following the rotation angle of the valve body 20.

  Therefore, in the mixing valve 1 of the present embodiment, the valve body 20 is set to a predetermined position with the position of the valve body 20 where the opening area of the water introduction port 11 is maximum and the opening area of the hot water introduction port 12 is 0 as an initial position. By rotating within the range of the angle Ub to the predetermined angle Uc, the amount (only) of hot water can be reduced with the water inlet 11 fully closed.

  As described above, in the mixing valve 1 of the present embodiment, the water inlet 11 and the hot water inlet 12 are opposed to each other with an angular interval of 180 degrees, and their center line Ca is the rotation axis O of the valve body 20. Since it is decentered by a predetermined distance e, there is no increase in size, weight, reduction in molding accuracy, etc., and an increase in rotational load, an increase in malfunctions, an increase in leakage, etc. Without mixing, water and hot water can be mixed quickly and accurately to obtain hot water at a desired temperature and flow rate, and the amount of hot water (only) can be rationally reduced with the water inlet 11 fully closed. As a result, a compact, inexpensive and useful mixing valve can be provided.

The partial notch longitudinal cross-sectional view which shows one Embodiment of the mixing valve which concerns on this invention. The horizontal sectional view which shows the valve body of the mixing valve shown by FIG. The horizontal sectional view of the mixing valve shown by FIG. The partial notch side view of the mixing valve shown by FIG. The perspective view which shows the valve body of the mixing valve shown by FIG. The figure which is provided for operation | movement description of the mixing valve shown by FIG. The graph which shows the characteristic of the mixing valve shown by FIG. The horizontal sectional view of the mixing valve used for description of the subject which this invention tends to solve. The figure which is provided for description of the subject which this invention tends to solve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mixing valve 10 Valve body 11 Water inlet 12 Hot water inlet 13 Outlet 14 Valve chamber 20 Valve body 22 Circumferential wall 30 Opening

Claims (1)

A water inlet and a hot water inlet are provided on substantially the same plane, and a valve main body provided with a outlet on the downstream side of the water inlet and the hot water inlet, and rotatable in the valve main body. A mixing valve provided with a substantially cylindrical valve body inserted and inserted in a peripheral wall portion thereof to continuously change the opening area of the water inlet and the hot water inlet according to the rotation angle; ,
The water inlet and the hot water inlet are opposed to each other with an angular interval of 180 degrees, and their center lines are eccentric by a predetermined distance with respect to the rotation axis of the valve body ,
When the opening area of the water inlet is the maximum and the position of the valve body where the opening area of the hot water inlet is the minimum is the initial position, the valve body is rotated from the initial position by a predetermined angle, The opening area of the water inlet gradually decreases to zero, and the opening area of the hot water inlet gradually increases to the maximum. When the valve body is further rotated in the same direction from this state, the water inlet A mixing valve characterized in that the open area of the hot water inlet is gradually reduced to a minimum in a fully closed state .

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