JP5610275B2 - Mixing valve - Google Patents

Description

  The present invention relates to a mixing valve used for, for example, mixing hot water with non-heated hot water in a hot water supply device to generate hot water at a predetermined temperature, or for mixing fluids other than this.

  The present applicant has previously proposed the one described in Patent Document 1 as an example of the mixing valve, which is shown in FIG. The mixing valve Ve shown in the figure has a configuration in which a first and second valve bodies 3A and 3B mounted on a valve shaft 2 are provided in a casing 1. The casing 1 is provided with inflow ports 10A and 10B for allowing the first and second fluids to flow into the inside, and an outflow port 11 for the mixed fluid. Further, in the casing 1, valve seat wall portions 40A and 40B in which first and second flow passages 42A and 42B are formed are provided. The first and second valve bodies 3A and 3B are attached to the valve shaft 2, and reciprocate in the longitudinal direction of the valve shaft 2 in a space 50 formed between the valve seat wall portions 40A and 40B. It is free. The first and second valve bodies 3A and 3B are urged in a direction away from each other by the spring 6, while the movement of the first and second valve bodies 3A and 3B is restricted by the restriction portions 21a and 21b so as not to be separated beyond a predetermined width. .

  In the mixing valve Ve described above, the first fluid passes through the first flow passage 42A and flows into the space portion 50, while the second fluid passes through the second flow passage 42B and enters the space portion 50. The first fluid and the second fluid mix in the space 50. This mixed fluid flows out of the casing 1 from the outlet 11. When the first and second valve bodies 3A and 3B move to the left in the drawing, the valve opening on the first flow passage 42A side becomes smaller, and moves to the right in the opposite figure. In this case, the valve opening degree on the second flow passage 42B side becomes small. Therefore, the mixing ratio of the first and second fluids can be changed by moving the first and second valve bodies 3A and 3B to the left and right. Further, in this mixing valve Ve, when the first valve body 3A is brought into contact with the valve seat wall portion 40A, the second valve body 3B is moved against the elastic force of the spring 6 to the first valve body 3B. It is possible to move the first valve body 3A toward the valve seat wall 40A side by the second valve body 3B. Therefore, the water sealing performance between the first valve body 3A and the valve seat wall portion 40A can be improved. On the other hand, when the second valve body 3B is brought into contact with the valve seat wall 40B, the second valve body 3B is pressed toward the valve seat wall 40B by the first valve body 3A. can do.

  However, the prior art still has room for improvement as described below.

  That is, generally, as a performance of the mixing valve, it is strongly required to obtain a mixed fluid in which the first and second fluids are sufficiently mixed. On the other hand, in the mixing valve Ve described above, the first and second fluids that have passed through the first and second flow passages 42A and 42B are merely configured to collide and mix in the space 50. For this reason, it cannot be asserted that the first and second fluids are sufficiently mixed, and there is room for improvement in this respect. In particular, in the above-described mixing valve Ve, the first and second valve bodies 3A and 3B are used as means for improving the water sealing performance when the first and second flow passages 42A and 42B are fully closed. The overall size of the first and second valve bodies 3A and 3B is relatively large, and the distance L20 between the first and second flow passages 42A and 42B is also relatively large. Therefore, the first and second fluids that have passed through the first and second flow passages 42A and 42B collide in a state where the flow velocity is lowered, which is disadvantageous in promoting mixing. .

JP 2010-31986

  The present invention has been conceived under the circumstances as described above, and it is possible to mix the first and second fluids to be mixed more sufficiently than before by simple means. The challenge is to provide a simple mixing valve.

  In order to solve the above problems, the present invention takes the following technical means.

The mixing valve provided by the present invention includes a casing provided with a pair of inflow ports for allowing the first and second fluids to individually flow into the inside, and an outflow port for the mixed fluid, and a casing in the casing. Among these, the first and second flow passages are provided so as to sandwich the space where the outflow port faces, and are used to advance the first and second fluids flowing into the casing into the space, and A mixing valve comprising: a valve body positioned in the space portion and capable of reciprocating in a predetermined direction so that the amount of fluid passing through the first and second flow passages can be changed; A pair of flanges protruding from the outer surface of the valve body so as to be spaced apart from each other, and having a tip portion approaching an inner wall surface surrounding the space portion of the casing. Between the pair of buttocks Frequency, the are a pair of first and a mixing chamber the second fluid each other are mixed with the front end portion of the flange portion has passed through the gap between the inner wall surface, both the leading end portion of the pair of flange portions Can be set in a state of being close to the edge of the outlet for the mixed fluid, while facing the outlet for the mixed fluid and in a non-facing state with respect to the inner wall surface, outer width of the pair of flange portions in the predetermined direction is characterized by being substantially the same as the opening width of the outlet for the mixed fluid.

According to such a configuration, when the first and second fluids pass through the first and second flow passages and flow into the mixing chamber, the gap between the pair of flanges and the inner wall surface of the casing. By passing through the formed gap having a small width, an effect of increasing the flow velocity can be obtained. Therefore, in the mixing chamber, the first and second fluids can collide with each other at a high flow velocity to promote mixing thereof, and a mixed fluid that is sufficiently mixed can be obtained. Further, as an important effect, according to the present invention, the outer width of the pair of flanges is substantially the same as the opening width of the outlet for the mixed fluid, so that the first and second fluids are mixed. Can keep at least one of the pair of flanges close to the outflow port at all times to the inner wall surface of the casing, and the first and second fluids also in the portion of the mixing chamber facing the outflow port. It is possible to maintain the flow velocity of at least one of the above in a high speed state (for details, refer to the description of FIG. 2 to FIG. 5 of the embodiment described later). As a result, regardless of the mixing ratio of the first and second fluids, it is more preferable for promoting the mixing of these fluids.

  In the present invention, preferably, the valve body includes first and second valve bodies corresponding to the first and second flow passages, respectively. The spring is biased in a direction away from each other and is controlled not to be separated beyond a predetermined width. When one of the first and second flow passages is closed, the spring elastic force The first and second valve bodies approach against the force, and the first and second valve seats are provided corresponding to one of the first and second flow passages. One of the two valve bodies can be pressed by the other, and the pair of flange portions are configured as spring receiving portions for supporting both end portions of the spring.

According to such a configuration, when one of the first and second flow passages is fully closed by one of the first and second valve bodies, the first and second valve bodies are It becomes possible to press the other against a predetermined valve seat by one, and an excellent water stop sealing performance can be obtained. The spring plays a role of returning the first and second valve bodies to the original state when the state where one of the first and second flow passages is fully closed is released. Since the pair of flange portions also serve as spring receiving portions that support both end portions of the spring, the configuration thereof is reasonable, and it is preferable to avoid complication of the structure.

  In this invention, Preferably, the location which narrowed the channel area in this outflow port partially was provided in the outflow port for said mixed fluid.

  According to such a configuration, when the first and second fluids mixed in the mixing chamber flow into the outlet, and pass through a portion where the flow passage area of the outlet is partially narrowed, the first and second fluids The flow rates of the first and second fluids are increased. Therefore, an effect of further promoting the mixing of the first and second fluids can be expected.

    In the present invention, it is preferable that the pair of flanges are notched or not cut for allowing the first and second fluids that have passed through the first and second flow passages to pass through the mixing chamber. At least one notch hole is provided.

  According to such a configuration, the first and second fluids that have passed through the first and second flow passages pass through a gap formed between the pair of flanges and the inner wall surface of the casing. In addition to passing through the holes provided in the pair of flanges, the gas flows into the mixing chamber. For this reason, the total flow rate of the fluid flowing into the mixing chamber can be increased. Therefore, it is suitable for improving the PQ characteristics and securing a large flow rate at a low pressure. Further, if the first and second fluids pass through the hole in addition to the gap, the turbulent flow is likely to occur in the mixing chamber, and the mixing of the first and second fluids is further promoted. .

  Other features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings.

It is sectional drawing which shows an example of the mixing valve which concerns on this invention. It is a principal part expanded sectional view of FIG. FIG. 3 is an essential part enlarged cross-sectional view showing a state in which the first and second valve bodies have moved to the left by a slight amount from the state shown in FIG. 2. FIG. 3 is an essential part enlarged cross-sectional view showing a state in which the first and second valve bodies have moved to the right by a slight amount from the state shown in FIG. 2. It is a principal part expanded sectional view which shows the other example of a mixing valve . It is a principal part expanded sectional view which shows the other example of the mixing valve which concerns on this invention. It is a principal part expanded sectional view which shows the other example of a mixing valve . (A) is a principal part expanded sectional view which shows the other example of the mixing valve which concerns on this invention, (b) is VIII-VIII sectional drawing of (a). (A), (b) is principal part sectional drawing which shows the other example of the mixing valve which concerns on this invention. It is sectional drawing which shows an example of a prior art.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

1 to 4 show an example of a mixing valve to which the present invention is applied. The basic configuration of the mixing valve V of the present embodiment is the same as that of the mixing valve Ve shown in FIG. Therefore, in this embodiment, the same or similar elements as those of the mixing valve Ve shown in FIG. 10 are denoted by the same reference numerals as those in FIG. 10, and the description thereof is also relatively simple.

  As clearly shown in FIG. 1, the mixing valve V of the present embodiment includes a casing 1, a motor M, a valve shaft 2, first and second valve bodies 3A and 3B, a pair of flange portions 7A and 7B, And valve seat walls 40A and 40B forming first and second flow passages 42A and 42B.

  The casing 1 has a pair of inlets 10A and 10B for allowing the first and second fluids to individually flow into the casing 1, and an outlet 11 for the mixed fluid. The valve shaft 2 is disposed in the casing 1 and extends in the left-right direction in FIG. 1, and is supported by first and second support members 4 </ b> A and 4 </ b> B disposed in the casing 1. The valve shaft 2 can be rotated by a motor M, and screw portions 20 and 49 constituting a feed screw mechanism are formed on the outer surface of the valve shaft 2 and the inner surface of the second support member 4B. When the motor M is driven by this feed screw mechanism, the valve shaft 2 moves (reciprocates) in the longitudinal direction while rotating forward or backward.

  The valve seat wall portions 40A and 40B are provided in the casing 1 so as to be spaced from each other in the longitudinal direction of the valve shaft 2, and valve seats 41a and 41b are formed on surfaces facing each other. The outlet 11 for the mixed fluid is provided so as to face the space 50 formed between the valve seat walls 40A and 40B, and the outlet 11 and the space 50 are directly connected to each other. . The first and second flow passages 42A and 42B are provided in the valve seat wall portions 40A and 40B so as to open, and allow the first and second fluids flowing into the casing 1 from the inlets 10A and 10B. It is a part for making it progress toward the space part 50. FIG. In the drawing, the valve seat wall portion 40B is constituted by the second support member 4B, and the valve seat wall portion 40A is formed integrally with the casing 1, but it is not limited to this. For example, the valve seat wall portion 40 </ b> A may be configured using a member separate from the casing 1.

  The first and second valve bodies 3A, 3B are for changing the fluid flow rate of the first and second flow passages 42A, 42B, are arranged in the space 50, and move the valve shaft 2. Accordingly, the valve shaft 2 can reciprocate in the longitudinal direction. When the first and second valve bodies 3A and 3B move to the left in FIG. 1, the valve opening on the first flow passage 42A side becomes small, and the inflow amount of the first fluid into the space 50 Decrease. On the contrary, when the first and second valve bodies 3A, 3B move to the right in FIG. 1, the valve opening on the second flow passage 42B side becomes small, and the second opening to the space 50 is made. The flow rate of fluid decreases.

  The first and second valve bodies 3A and 3B are urged in a direction away from each other by the spring 6, while using locking members 21a and 21b such as an E-ring so as not to separate beyond a predetermined width. Position regulation is aimed at. Although illustration explanation is omitted, in this mixing valve V, for example, when the first and second valve bodies 3A, 3B move to the left and the first flow passage 42A is fully closed, the second The valve body 3B can be pushed leftward by the locking member 21b. As a result, the first valve body 3A is pressed leftward by the second valve body 3B, and the first valve body 3A and the valve seat 41a are brought into contact with each other with a large force. It is possible to improve the property. When such a state is released, the first and second valve bodies 3A and 3B can be returned to their original predetermined width by the elastic force of the spring 6. Contrary to the above, when the first and second valve bodies 3A and 3B are moved to the right and the second flow passage 42B is fully closed, the second valve body 3B is moved to the second position. The second valve body 3B and the valve seat 41b can be brought into contact with each other with a large force by being pressed to the right by the first valve body 3A.

An auxiliary member 9 for stabilizing the support of the first and second valve bodies 3A and 3B is provided between the first and second valve bodies 3A and 3B and the valve shaft 2. The first and second valve bodies 3A and 3B are also provided with engaging portions 38a and 38b for preventing their relative rotation.
If the first and second valve bodies 3A and 3B are relatively rotated, there is a problem that a torsional force acts on the spring 6. The engaging portions 38a and 38b serve to prevent such a twisting force from being generated. Since these engaging portions 38a and 38b are described in detail in the above-mentioned Patent Document 1, further explanation is omitted.

  The pair of flanges 7A and 7B are substantially disc-shaped protruding from the outer surfaces of the first and second valve bodies 3A and 3B, and serve as spring receiving portions that support both ends of the spring 6. . However, the pair of flanges 7A and 7B also serve to promote mixing of the first and second fluids. As a configuration for fulfilling such a role, the tip portions of the pair of flange portions 7A and 7B approach the inner wall surface 12 surrounding the space portion 50 in the casing 1 and have a minute width (for example, 0) between them. (About 3 mm wide) are formed. In the space 50, the region between the pair of flanges 7A and 7B is a mixing chamber 51 in which the first and second fluids passing through the gaps 52a and 52b are mixed. Furthermore, the outer width L1 of the pair of flanges 7A and 7B is substantially the same as the opening width L2 of the outlet 11 for the mixed fluid (see also FIG. 2). Here, both the outer width L1 and the opening width L2 are widths in the longitudinal direction of the valve shaft 2, but the outer width L1 of the flanges 7A and 7B is in a state where the first and second fluids are mixed. The outer width L1 of the flange portions 7A and 7B is not the width when the first and second valve bodies 3A and 3B approach each other by compressing the spring 6. Further, the above-described opening width L2 is an opening width at a boundary portion with the space portion 50 among the opening widths (inner diameters) of the respective portions of the outlet 11.

  Next, the operation of the mixing valve V will be described.

  First, the mixing valve V is incorporated in, for example, a hot water supply device, and mixes heated hot water (an example of a first fluid) and non-heated hot water (an example of a second fluid) at a desired temperature. Used for generating hot water. In this mixing valve V, similarly to the mixing valve described in Patent Document 1 described above, the motor M is driven to move the first and second valve bodies 3A, 3B to the left and right, thereby And the opening degree of 2nd flow path 42A, 42B can be changed, and 1st and 2nd hot water can be mixed by a desired ratio. As described above, when the first and second flow passages 42A and 42B are individually fully closed, one of the first and second valve bodies 3A and 3B is pressed by the other to Another advantage is that the contact between the first valve body 3A and the valve seat 41a or the contact between the second valve body 3B and the valve seat 41b can be performed firmly.

  In addition to the above-described effects, the mixing valve V provides a specific effect that promotes mixing of the first and second fluids as follows.

  First, when the first fluid passes through the first flow passage 42A and flows into the mixing chamber 51, a minute width formed between the front end portion of the flange portion 7A and the inner wall surface 12 of the casing 1 is formed. It passes through the gap 52a. For this reason, the first fluid that has passed through the gap 52 a flows into the mixing chamber 51 with its flow velocity increased. Similarly, when the second fluid passes through the second flow passage 42B and flows into the mixing chamber 51, the second fluid has a minute width formed between the distal end portion of the flange portion 7B and the inner wall surface 12. Since it passes through the gap 52b, the flow velocity is increased and flows into the mixing chamber 51. Therefore, in the mixing chamber 51, it is possible to cause the first and second fluids to collide and mix in a state where the flow velocity is high, and the mixing thereof is promoted.

As shown in FIGS. 1 and 2, the tip end portions of the pair of flange portions 7 </ b> A and 7 </ b> B may not directly face the inner wall surface 12 of the casing 1 at the location where the mixed fluid outlet 11 is open. . However, in this embodiment, since the outer width L1 of the pair of flanges 7A and 7B is substantially the same as the opening width L2 of the outlet 11, at least one tip of the pair of flanges 7A and 7B is It is possible to keep the inner wall surface 12 of the casing 1 always close. That is, in the state shown in FIG. 2, of the pair of flange portions 7A and 7B, the portions 7A ′ and 7B ′ closer to the outlet 11 are not directly facing the inner wall surface 12 of the casing 1, The portions 7A ′ and 7B ′ can be brought close to the inner wall surface 12, and the widths of the gaps 52a ′ and 52b ′ formed at these locations can be reduced. Accordingly, it is possible to increase the flow rate of the fluid passing through the gaps 52a ′ and 52b ′.

  As shown in FIG. 3, when the first and second valve bodies 3A, 3B are moved to the left of the drawing from the position shown in FIG. 2, the outlet portion 7B ′ of the flange portion 7B and the inner wall surface Although the distance L3 with the edge of 12 becomes large, a very narrow gap 52a is ensured between the outlet portion 7A ′ of the flange portion 7A and the inner wall surface 12. Therefore, it is possible to increase the flow velocity of the first fluid passing through the gap 52a and promote the mixing of the first and second fluids. When the flow rates of both the first and second fluids are slow, mixing of these tends to be insufficient. However, if the flow rate of either one of the first and second fluids is increased, they will be mixed. The effect of promoting the mixing of is obtained. As shown in FIG. 4, when the first and second valve bodies 3A, 3B move to the right of the drawing from the position shown in FIG. 2, the outlet portion 7A ′ and the inner wall surface of the flange 7A Although the distance L4 with the edge of 12 becomes large, a gap 52b having a very small width is secured between the outlet portion 7B ′ of the flange portion 7B and the inner wall surface 12, so that the second fluid The effect of increasing the flow rate and promoting the mixing of the first and second fluids is obtained.

  Furthermore, in the present embodiment, the following effects can be obtained as compared with the embodiment shown in FIG. That is, in order to efficiently mix the first and second fluids that have passed through the gaps 52a and 52b and have a high flow velocity, the distance between the gaps 52a and 52b (the outer width L1 of the pair of flanges 7A and 7B). Should not be too long. This is because, as the distance between the gaps 52a and 52b is longer, the flow velocity of the first and second fluids gradually decreases before the first and second fluids are mixed. On the other hand, in the present embodiment, the outer width L1 of the pair of flanges 7A and 7B is substantially the same as the opening width L2 of the outlet 11, and the gaps 52a and 52b are closer to each other than in the embodiment shown in FIG. It is possible to shorten the distance and make it difficult to reduce the flow rates of the first and second fluids. Therefore, it is more preferable to cause the first and second fluids to collide and mix at high speed.

5 to 9 show other examples of the mixing valve. In these drawings, elements that are the same as or similar to those in the above embodiment are given the same reference numerals as in the above embodiment.

In the embodiment shown in FIG. 5, the outer width L1 of the pair of flanges 7A and 7B is made larger than the opening width L2 of the outlet 11 for the mixed fluid. According to such a configuration, as shown in the figure, out of the pair of flange portions 7A and 7B, the outlet-side portions 7A ′ and 7B ′ can both face the inner wall surface 12 and approach each other. is there. Further, when the first and second valve bodies 3A and 3B are moved leftward or rightward from the positions shown in the figure, at least one of the portions 7A ′ and 7B ′ is moved to the inner wall surface 12. Ru can der to keep as close so as to face.

  In the embodiment shown in FIG. 6, a ring-shaped member 8, which is separate from the members constituting the main part of the casing 1, is fitted inside the outlet 11 for the mixed fluid. The inner diameter D1 of the ring-shaped member 8 is smaller than the inner diameter D2 of the other part of the outlet 11. Therefore, the flow path area in the outflow port 11 is partially narrowed at the place where the ring-shaped member 8 is provided. According to the present embodiment, when the first and second fluids mixed in the mixing chamber 51 pass through the ring-shaped member 8, the flow velocity is increased. Therefore, an effect of further promoting the mixing of the first and second fluids at that portion can be expected.

In the embodiment shown in FIG. 7, the opening width L <b> 2 of the outlet 11 (the opening width at the boundary with the space portion 50) is defined by the ring-shaped member 8 </ b> A inserted into the outlet 11 for the mixed fluid. Yes. Even with such a configuration, if the outer width L1 of the pair of flange portions 7A and 7B is substantially the same as the opening width L2, the intended effect of the present invention can be obtained. As understood from the present embodiment, the opening width L <b> 2 of the outlet 11 may be defined using a member separate from the member constituting the main part of the casing 1.

  In the embodiment shown in FIG. 8, a plurality of holes 37 are provided through the pair of flanges 7A and 7B. More specifically, as shown in FIG. 2B, a plurality of holes 37 having a partially cut-out slit shape are provided at a position near the outer peripheral edge of one collar portion 7A. . The width L30 of each hole 37 is substantially the same as the width L31 of the gap 52a, for example, about 0.3 mm. The other brim portion 7B has the same configuration. Preferably, the holes 37 provided in the flange portions 7A and 7B are arranged to face each other.

  According to the present embodiment, the first and second fluids that have passed through the first and second flow passages 42 </ b> A and 42 </ b> B are gaps formed between the flanges 7 </ b> A and 7 </ b> B and the inner wall surface 12 of the casing 1. In addition to 52a and 52b, it also passes through the plurality of holes 37 and flows into the mixing chamber 51. For this reason, the fluid inflow to the mixing chamber 51 is promoted, and the PQ characteristics can be improved. Further, if the first and second fluids pass through the holes 37 in addition to the gaps 52a and 52b, turbulent flow is likely to occur in the mixing chamber 51, thereby causing the first and second fluids to flow. An effect of further promoting mixing can be expected. Further, since the width L30 of each hole 37 is substantially the same as the width L31 of the gaps 52a and 52b, the fluid that has passed through each hole 37 and the fluid that has passed through the gaps 52a and 52b are made to have substantially the same flow velocity. And can prevent large deviations in their flow rates. Therefore, the first and second fluids can be mixed evenly in the various portions of the mixing chamber 51 to further enhance the mixing promotion effect.

  In the embodiment shown in FIG. 9A, the hole 37a provided in the flange portion 7A is a non-notched slit. In the embodiment shown in FIG. 5B, the hole 37b provided in the flange portion 7A is a non-slit hole such as a circular shape. As will be understood from these embodiments, the hole provided in the collar portion only needs to have a function of allowing fluid to pass therethrough, and the specific shape thereof is not limited. The hole provided in the collar part may be configured to have a bent or curved passage so that the fluid passing through the hole becomes a turbulent flow.

  The present invention is not limited to the contents of the above-described embodiment. The specific configuration of each part of the mixing valve according to the present invention can be varied in design in various ways.

  The pair of collars referred to in the present invention may not be used as a spring receiving part. Further, in the present invention, it is sufficient that at least a pair of flanges is provided on the valve body, and the case where a pair or more (two or more) flanges are provided is also included in the technical scope of the present invention. The

  In the above-described embodiment, the first and second valve bodies are used as the valve body, and the first and second flow passages are fully closed using the first and second valve bodies. In this case, the other valve body can be pressed in a predetermined direction by one valve body, but the present invention is not limited to this. For example, when the first and second flow passages are fully closed, a mixing valve of a type that does not have a function of pressing the other valve body by one valve body, or each of the first and second flow passages. It may be configured as a mixing valve of a type that does not have a function of fully closing. Furthermore, only one valve body is used as the valve body, and this type of mixing is configured to change the mixing ratio of the first and second fluids when the valve body reciprocates in a predetermined direction. The present invention can also be applied to a valve.

The specific types and components of the first and second fluids referred to in the present invention are not limited. The mixing valve according to the present invention can be used for mixing various fluids.

V Mixing valve L1 Outer width L2 of a pair of flanges Opening width 1 of outlet for mixed fluid 1 Casing 2 Valve shafts 3A, 3B First and second valve bodies (valve bodies)
6 Spring 7A, 7B Pair of flanges 10A, 10B Inlet 11 for first and second fluids Outlet 12 for mixed fluid Inner wall surface 37, 37a, 37b Hole 41a, 41b Valve seats 42A, 42B First and second Two flow paths 50 Space 51 Mixing chamber 52a, 52b Gap

Claims (4)

A pair of inlets for individually flowing the first and second fluids therein, and a casing provided with an outlet for the mixed fluid;
The first and second flow passages provided in the casing so as to sandwich the space where the outflow port faces and for allowing the first and second fluids flowing into the casing to advance to the space. When,
A valve body that is located in the space and is capable of reciprocating in a predetermined direction so that the amount of fluid passing through the first and second flow passages can be changed;
A mixing valve comprising:
A pair of flanges protruding from the outer surface of the valve body so as to be spaced apart from each other in the predetermined direction, and having a tip portion approaching an inner wall surface surrounding the space portion of the casing;
Of the space portion, a region between the pair of flange portions is a mixing chamber in which the first and second fluids that have passed through the gap between the tip end portions of the pair of flange portions and the inner wall surface are mixed. And
Both front ends of the pair of flanges face the outlet for mixed fluid and approach the edge of the outlet for mixed fluid while not facing the inner wall surface. to be capable of setting the state, the outer width of the pair of flange portions in the predetermined direction, characterized in that it is substantially the same opening width of the outlet and for the mixed fluids, the mixing valve. The valve body has first and second valve bodies corresponding to the first and second flow passages, respectively.
The first and second valve bodies are biased in a direction away from each other by a spring, and are regulated so as not to be separated beyond a predetermined width, and either one of the first and second flow passages. When the valve is closed, the first and second valve bodies approach against the elastic force of the spring, and are provided corresponding to either the first or second flow path. One of the first and second valve bodies can be pressed against the valve seat by the other,
2. The mixing valve according to claim 1, wherein the pair of flange portions is configured as a spring receiving portion for supporting both end portions of the spring.   The mixing valve according to claim 1 or 2, wherein a portion in which a flow path area in the outflow port is partially narrowed is provided in the outflow port for the mixed fluid.   The pair of flanges has at least one notched or non-notched hole for allowing the first and second fluids that have passed through the first and second flow passages to pass through the mixing chamber. The mixing valve according to any one of claims 1 to 3, which is provided as described above.

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