JP2018035898A - Mixer valve unit and water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mixer valve unit capable of easily realizing a fail-safe state when the mixer valve shows an abnormal state.SOLUTION: A mixer valve unit 20 of a certain preferred embodiment in this invention comprises a first introduction passage 42 for feeding first fluid becoming to show a high pressure in relative manner; a second introduction passage 44 for feeding second fluid becoming to show a low pressure in relative manner; a mixer valve 30 having a mixing chamber for communicating with the first introduction passage 42 and the second introduction passage 44 and capable of adjusting a mixture ratio between the first fluid and the second fluid; a lead-out passage 46 communicated with the mixing chamber to lead out the mixed fluid; a bypass passage 48 for communicating the second introduction passage 44 with the lead-out passage 46 while bypassing the mixing chamber; and a bypass valve 32 for opening or closing the bypass passage 48 by detecting a differential pressure between the first fluid and the second fluid.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a mixing valve unit, and more particularly to a configuration capable of realizing fail-safe when a malfunction occurs in the mixing valve.

  In recent years, hot water storage type hot water supply devices have become widespread for reasons such as being environmentally friendly and keeping utility costs relatively low. Such a hot water supply apparatus includes a heat source unit and a hot water storage unit using a heat pump and a fuel cell (see, for example, Patent Document 1).

  The hot water storage unit is provided with a hot water storage tank for storing hot water. A water supply pipe is connected to the lower part of the hot water storage tank, and low temperature water is supplied from the water supply. This low-temperature water is sent to the heat source unit for heat exchange and returned to the upper part of the hot water storage tank as hot water. As a result, in the hot water storage tank, a temperature stratification is formed in which high temperature hot water (high temperature water) is present in the upper portion, intermediate temperature hot water (medium temperature water) is present in the middle portion, and low temperature hot water (low temperature water) is present in the lower portion. A hot water supply pipe is connected to the high temperature layer of the hot water storage tank, and merges with the water supply pipe on the downstream side. A mixing valve is installed at the junction between the hot water supply pipe and the water supply pipe, and the mixing ratio between the high temperature water flowing through the hot water supply pipe and the low temperature water flowing through the water supply pipe is adjusted to provide hot water at the appropriate temperature for the downstream water supply equipment. To derive.

JP 2011-43102 A

  In such a hot water supply device, a temperature sensor is provided on the downstream side of the mixing valve so that the mixing valve does not fail and hot water is not supplied to the water supply facility. When this temperature sensor shows an abnormal value, fail-safety is ensured by closing, for example, an electromagnetic valve installed on the downstream side of the mixing valve. However, depending on the heat source unit, the temperature of the hot water becomes very high, and further improvement is desired.

  In addition to such a hot water supply device, for example, when mixing fluids having different properties from each other, such as generating a third fluid by mixing the first fluid and the second fluid at a predetermined mixing ratio. It is also assumed that a fail safe of the mixing valve is required.

  This invention is made | formed in view of such a subject, The objective is to provide the mixing valve unit which can implement | achieve the fail safe easily when abnormality arises in a mixing valve.

  One embodiment of the present invention is a mixing valve unit. The mixing valve unit includes a first introduction path for introducing a first fluid having a relatively high pressure, a second introduction path for introducing a second fluid having a relatively low pressure, a first introduction path, and a first introduction path. 2 a mixing chamber that communicates with the introduction path, a mixing valve that is capable of adjusting a mixing ratio of the first fluid and the second fluid, a lead-out path that communicates with the mixing chamber and derives the mixed fluid; A bypass passage that communicates the second introduction path and the lead-out path while bypassing the mixing chamber; and a bypass valve that opens and closes the bypass path by sensing a differential pressure between the first fluid and the second fluid.

  According to this aspect, even if an abnormality occurs in the mixing valve, the bypass valve opens the bypass passage according to the differential pressure between the first fluid and the second fluid, so that the second fluid is actively derived. Can lead to the road. For example, in an example of a hot water supply apparatus, generally, high-temperature water on which a built-in pump is loaded has a higher pressure than low-temperature water. For this reason, when the mixing valve unit of this aspect is applied, the low-temperature water can be reliably and easily guided to the outlet path by opening the bypass valve. Therefore, even if hot water is led out from the mixing chamber due to an abnormality in the mixing valve, it can be quickly cooled in the outlet path. According to this aspect, it is possible to easily realize fail-safe when an abnormality occurs in the mixing valve.

  Another aspect of the present invention is a hot water supply apparatus. This hot water supply device is connected to a water supply pipe for introducing low-temperature water from the water supply and a fluid flow path branched from the water supply pipe, and performs heat exchange between the heat source to supply hot water to the hot water supply pipe. A hot water with a suitable temperature by mixing a water heater, a pump for generating a flow of hot water in the heat exchanger, high temperature water introduced through a hot water supply pipe, and low temperature water introduced through a water supply pipe, A mixing valve unit for deriving the hot water toward the hot water supply facility, a temperature sensor for detecting the temperature of the hot water derived from the mixing valve unit, and a controller for controlling the mixing valve unit are provided.

  The mixing valve unit has a first introduction path connected to the hot water supply pipe, a second introduction path connected to the water supply pipe, a mixing chamber communicating with the first introduction path and the second introduction path, A mixing valve that can adjust the mixing ratio with low-temperature water, a mixing chamber that communicates with the mixing chamber, leads out the mixed fluid to the hot water supply facility, and bypasses the mixing chamber between the second introducing passage and the leading passage. And a bypass valve that opens and closes the bypass passage according to a differential pressure between the high temperature water and the low temperature water, and a pressure introduction valve that can supply the pressure of the high temperature water to the bypass valve when the valve is opened.

  The bypass valve partitions the valve hole provided in the bypass passage, the high pressure chamber communicating with the first introduction passage and the high pressure passage, the low pressure chamber communicating with the bypass passage, the high pressure chamber and the low pressure chamber, and the differential pressure And a valve body which is provided integrally with the pressure sensitive member and which opens and closes the valve portion by contacting and separating from the valve hole. The pressure introduction valve is a normally closed solenoid valve that opens when energized.When the pressure introduction valve is open, the bypass valve is closed.When the pressure introduction valve is closed, the bypass valve is closed. The valve is opened, and the controller cuts off the power supply to the pressure introducing valve when the temperature detected by the temperature sensor exceeds a predetermined abnormality determination value.

  According to this aspect, even if an abnormality occurs in the mixing valve, the bypass valve opens the bypass passage according to the differential pressure between the high temperature water and the low temperature water, so that the low temperature water can be actively guided to the outlet path. . Thereby, the hot water supplied to the hot water supply facility can be prevented from becoming hot water. That is, fail safe when an abnormality occurs in the mixing valve can be easily realized.

  ADVANTAGE OF THE INVENTION According to this invention, the mixing valve unit which can implement | achieve fail safe easily when abnormality arises in a mixing valve can be provided.

It is a system diagram showing the structure of the hot water supply apparatus which concerns on embodiment. It is a figure showing the external appearance of a mixing valve unit. It is a figure showing the external appearance of a mixing valve unit. It is AA arrow sectional drawing of FIG. It is a BB arrow sectional view of Drawing 3. Indicates the closed state of the pressure introduction valve. It is a figure showing cooperation operation of a bypass valve and a pressure introduction valve.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, for the sake of convenience, the positional relationship between the structures may be expressed based on the illustrated state.

  FIG. 1 is a system diagram illustrating a configuration of a hot water supply apparatus according to an embodiment. The hot water supply apparatus of the present embodiment is a hot water storage type hot water supply apparatus including a hot water storage unit 10 and a heat source unit 12. The hot water storage unit 10 includes a hot water storage tank 14, piping for circulating or supplying hot water, a control valve for controlling the flow of hot water, a sensor for detecting the temperature and flow rate of the hot water, and the like. The “pipe” such as the following water supply pipe means a conduit through which a fluid can flow, and includes a flow path in the apparatus in addition to a member connecting the apparatus and components. The hot water supply device supplies hot water adjusted to an appropriate temperature by the hot water storage unit 10 to a water supply facility (not shown) such as a bathtub or currant.

  Low temperature water from the water supply is supplied to the hot water storage unit 10 through the water supply pipe 16. A pipe 18 branches from the water supply pipe 16 and is connected to the lower part of the hot water storage tank 14. A boiling circulation circuit is formed between the hot water storage tank 14 and the heat source unit 12. That is, the outlet pipe 22 connected to the lower part of the hot water storage tank 14 is connected to the heat source unit 12, and the return pipe 24 connected to the heat source unit 12 is connected to the upper part of the hot water storage tank 14.

  With such a configuration, the hot water storage tank 14 is formed with a temperature stratification in which high-temperature water is present in the upper part, intermediate-temperature water in the middle part, and low-temperature water in the lower part. The low-temperature water accumulated in the lower part of the hot water storage tank 14 is heat-exchanged by the heat source unit 12 to be converted into high-temperature water and returned to the hot water storage tank 14. The outlet pipe 22 is provided with a pump 26 that promotes circulation of hot water in the boiling circulation circuit.

  A hot water supply pipe 28 for leading out high temperature water is connected to the upper part of the hot water storage tank 14. The hot water supply pipe 28 is connected to the water supply pipe 16 via the mixing valve unit 20. The high temperature water flowing through the hot water supply pipe 28 and the low temperature water flowing through the water supply pipe 16 are mixed in the mixing valve 30 of the mixing valve unit 20. The hot water having an appropriate temperature by this mixing is supplied to the hot water supply equipment through the supply pipe 40.

  The mixing valve unit 20 is a composite valve obtained by assembling the mixing valve 30, the bypass valve 32, and the pressure introduction valve 34 integrally. The mixing valve unit 20 has a common body for each valve. The body is provided with a first introduction path 42, a second introduction path 44, a lead-out path 46, and a bypass path 48. The first introduction path 42 connects the mixing valve 30 and the hot water supply pipe 28. The second introduction path 44 connects the mixing valve 30 and the water supply pipe 16. The lead-out path 46 connects the mixing valve 30 and the supply pipe 40. The bypass passage 48 connects the second introduction passage 44 and the outlet passage 46 while bypassing the mixing valve 30.

  The mixing valve 30 adjusts the mixing ratio between the high-temperature water supplied via the hot water supply pipe 28 and the low-temperature water supplied via the water supply pipe 16, and derives hot water at an appropriate temperature into the supply pipe 40. The pressure introduction valve 34 supplies high-pressure water pressure to the bypass valve 32 by opening the valve. The bypass valve 32 opens and closes the bypass passage 48 according to the differential pressure between the high temperature water and the low temperature water. The details of the configuration and operation of the mixing valve unit 20 will be described later.

  A check valve 50 is provided in the hot water supply pipe 28. The check valve 50 prevents the hot water of the mixing valve unit 20 from flowing back to the hot water storage tank 14 when hot water supply is stopped. A temperature sensor 52 is provided in the supply pipe 40. A control unit (not shown) acquires the temperature of the temperature sensor 52 and controls the opening degree of the mixing valve 30 so that the hot water supply temperature set by the user with a remote controller (not shown) is obtained.

  A check valve 54 is provided upstream of the branch point in the water supply pipe 16. The check valve 54 prevents back flow of hot water from the hot water storage unit 10 to the water supply. A pressure reducing valve 56 and a shutoff valve 58 are provided on the upstream side of the check valve 54. The pressure reducing valve 56 appropriately reduces the pressure of the low-temperature water supplied through the water supply pipe 16. That is, pressure adjustment is appropriately performed so that the hot water storage tank 14 and the like are not damaged by water pressure. The shutoff valve 58 shuts off the water supply pipe 16 when predetermined hot water has accumulated in the hot water storage tank 14 and appropriately stops the supply of low temperature water.

  On the downstream side of the temperature sensor 52, an electromagnetic valve for adjusting the flow rate of hot water supplied to the hot water supply facility, a check valve for preventing a backflow from the hot water supply facility to the hot water storage unit 10, and the like are provided. Omitted.

  On the other hand, the heat source unit 12 is a fuel cell unit in the present embodiment, but may be a heat pump unit. These units include a heat exchanger for exchanging heat with the hot water storage unit 10. The low-temperature water flowing through the above-described boiling circulation circuit is boiled up into the high-temperature water when passing through the heat exchanger. When the hot water storage unit 10 is activated for this heat exchange, the pump 26 is driven, so that the high temperature water supplied via the hot water supply pipe 28 is higher in pressure than the low temperature water supplied via the water supply pipe 16. It becomes. Since these configurations and operations are publicly known, detailed description thereof is omitted.

Next, a specific configuration of the mixing valve unit 20 will be described.
2 and 3 are views showing the appearance of the mixing valve unit 20. FIG. 2 is a front view, and FIG. 3 is a left side view. 4 is a cross-sectional view taken along the line AA in FIG. 5 is a cross-sectional view taken along the line BB in FIG. 6 is a cross-sectional view taken along the line CC of FIG.

  As shown in FIG. 2, the mixing valve unit 20 is configured by assembling a mixing valve 30, a bypass valve 32, and a pressure introduction valve 34 to a common body 60. As shown also in FIG. 3, the body 60 has a T-shaped pipe including a first pipe 62, a second pipe 64, and a third pipe 66. The first pipe 62 and the second pipe 64 are formed coaxially to form a straight pipe 68, and the third pipe 66 is connected to the center of the straight pipe 68 at a right angle.

  The 1st piping 62 is connected to the hot water supply pipe 28, and introduces high temperature water (white arrow). The 2nd piping 64 is connected to the water supply pipe 16, and introduces low temperature water (black arrow). The 3rd piping 66 is connected to the supply pipe 40, and the mixed hot water is derived | led-out (hatching arrow). A mixing valve 30 is provided at the connection point of the three pipes. A motor 70 that drives the valve portion of the mixing valve 30 is provided on the opposite side of the straight pipe 68 from the third pipe 66. A bypass valve 32 is provided so as to straddle the second pipe 64 and the third pipe 66, and a pressure introduction valve 34 is provided so as to straddle the first pipe 62 and the bypass valve 32. The bypass valve 32 and the pressure introducing valve 34 are arranged adjacent to each other so that their axes are parallel to each other. Their axes are perpendicular to the axis of the mixing valve 30.

  As shown in FIG. 4, the mixing valve unit 20 has a body 60 obtained by integral molding of a resin material, and a motor 70 is attached to the upper end portion of the body 60. A first introduction path 42 is formed inside the first pipe 62, a second introduction path 44 is formed inside the second pipe 64, and a lead-out path 46 is formed inside the third pipe 66. . A mixing chamber 72 is provided at a connection point between the first introduction path 42, the second introduction path 44, and the outlet path 46. The mixing chamber 72 has a cylindrical shape coaxial with the lead-out path 46 and is located approximately at the center of the body 60.

  The mixing valve 30 includes a stepped cylindrical valve driver 74 that is rotatably supported by the body 60. The valve driver 74 is composed of an upper half rotary shaft 76 and a lower half valve body 78. The rotating shaft 76 is supported by the body 60 so as to be able to rotate and slide, and two O-rings 80 for securing a sealing property with the body 60 are fitted on the outer peripheral surface thereof. The upper end portion of the rotation shaft 76 is connected to the rotation shaft of the motor 70.

  The valve body 78 has a bottomed cylindrical shape whose diameter is larger than that of the rotating shaft 76, and a mixing chamber 72 is formed inside the valve body 78. A flow rate adjusting hole 82 that communicates the inside and the outside is provided in the side portion of the valve body 78. The flow rate adjusting hole 82 is formed over about 210 degrees in the circumferential direction of the valve body 78, and a half portion on one side has a large opening width (vertical width) with a small column 84 provided at the center in the circumferential direction as a boundary. A large mouth portion 86 is formed, and the opposite half portion is a small mouth portion 88 having a small opening width (see FIG. 6). As shown in the figure, when the column 84 faces one of the first introduction path 42 and the second introduction path 44, the other introduction path is blocked. By controlling the rotational position of the flow rate adjusting hole 82, the opening ratio of the first introduction path 42 and the second introduction path 44 can be adjusted, and the mixing ratio of the high temperature water and the low temperature water can be adjusted.

  The motor 70 is configured by a stepping motor, a DC motor, or the like including a rotor and a stator (not shown), and is attached so as to close the upper end opening of the body 60. The upper end portion of the valve drive body 74 is connected to the rotor, and the rotation of the rotor appears as the rotation operation of the valve body 78. Based on the temperature detected by the temperature sensor 52, the control unit controls the rotational position of the valve body 78 so that the hot water supplied to the hot water supply facility becomes the set temperature.

  As shown in FIG. 5, a pressure chamber 90 communicating with each of the second introduction path 44 and the outlet path 46 is formed on the side of the body 60, and the bypass valve 32 is disposed. That is, the communication path 92 that communicates with the second introduction path 44 at a right angle and the communication path 94 that communicates with the lead-out path 46 at a right angle extend sideways so as to be parallel to each other, and communicate with each other in the pressure chamber 90. 48 is formed. A valve hole 96 is provided at the end of the communication path 92, and a valve seat 98 is formed on the front end surface thereof. A lid 100 is attached to close the side opening of the body 60, and a pressure chamber 90 is formed between the body 60 and the lid 100.

  A diaphragm 106 is provided so as to partition the pressure chamber 90 into a high pressure chamber 102 and a low pressure chamber 104. The low pressure chamber 104 communicates with the bypass passage 48. The diaphragm 106 functions as a “pressure-sensitive member” that can be displaced in the axial direction in accordance with the differential pressure between the high-pressure chamber 102 and the low-pressure chamber 104. The diaphragm 106 is obtained by molding a polymer resin material, and a valve body 108 is integrally formed at the center thereof. As the polymer resin material, for example, rubber, polyimide (PI), polyamide (PA), polyester, polyetheretherketone (PEEK), polyphenylene sulfide (PPS), or the like can be used.

  A step (step) is provided at the center of the pressure chamber 90 in the axial direction, and a ring-shaped support member 110 is disposed so as to sandwich the peripheral portion of the diaphragm 106 between the step. The lid body 100 is fitted so as to hold the support member 110 from the rear (the high pressure chamber 102 side). An O-ring 112 (seal ring) is fitted on the outer peripheral surface of the lid body 100 to ensure the sealing performance inside and outside the body 60. A spring 114 (functioning as an “urging member”) that biases the valve body 108 in the valve opening direction of the bypass valve 32 is interposed between the body 60 and the valve body 108.

  Between the central portion and the peripheral portion of the diaphragm 106, a wave-like portion having a ring shape in a plan view and a wave shape in a cross-sectional view is formed. Due to the deformation of the wavy portion, the valve element 108 is displaced in the axial direction. The valve body 108 is attached to and detached from the valve seat 98 in the low pressure chamber 104 to open and close the bypass valve 32. The central portion of the lid 100 extends toward the inside of the pressure chamber 90, and the front end surface forms a stopper 116. The stopper 116 restricts the displacement of the diaphragm 106 toward the high-pressure chamber 102 as shown in the figure, and defines the fully open position of the valve body 108 (fully opened state of the bypass valve 32).

  A leak passage 107 having a small cross section that connects the high pressure chamber 102 and the low pressure chamber 104 is provided at a predetermined position of the diaphragm 106. The leak passage 107 functions as a “pressure equalizing hole” for equalizing (homogenizing) the pressures of the high pressure chamber 102 and the low pressure chamber 104 when the pressure introduction valve 34 is closed, and details thereof will be described later.

  As shown in FIG. 6, the pressure introduction valve 34 is disposed adjacent to the bypass valve 32. The body 60 is provided with an attachment hole 118 for attaching the pressure introduction valve 34. The pressure introduction valve 34 is a normally closed electromagnetic valve, and includes a cylindrical body 120, a core 122 fixed to the inside of the body 120, a plunger 124 disposed opposite to the core, and an outer peripheral surface of the body 120. And an electromagnetic coil 126 wound around. The lower half portion of the body 120 is inserted into the mounting hole 118 and is airtightly attached via a sealing O-ring 119.

  A valve chamber 130 is formed behind the mounting hole 118. A communication path 132 that communicates the valve chamber 130 and the first introduction path 42 and a communication path 134 that communicates the valve chamber 130 and the high-pressure chamber 102 are provided. The communication passages 132 and 134 and the valve chamber 130 form a high-pressure passage 136 that allows the first introduction path 42 and the high-pressure chamber 102 to communicate with each other. The above-described leak passage 107 of the bypass valve 32 has a flow path cross section that is sufficiently smaller than the high-pressure passage 136.

  A valve hole 138 is provided at the end portion of the communication passage 132 on the valve chamber 130 side, and a valve seat 140 is formed by the tip end surface thereof. The communication path 134 communicates with the high-pressure chamber 102 through a slit 142 provided in the support member 110.

  A valve body 144 is assembled to the lower end portion of the plunger 124 (the end portion opposite to the core 122). The valve body 144 is made of an elastic body (for example, rubber) and is disposed in the valve chamber 130. When the valve body 144 is attached to and detached from the valve seat 140, the pressure introduction valve 34 is opened and closed. A spring 146 that urges the plunger 124 in the valve closing direction of the pressure introducing valve 34 is interposed between the core 122 and the plunger 124.

  With such a configuration, as shown in the drawing, the bypass valve 32 is opened when the pressure introduction valve 34 is closed, and the bypass valve 32 is closed when the pressure introduction valve 34 is opened. Details thereof will be described later.

Next, the operation of the mixing valve unit 20 accompanying the operation state of the hot water supply device will be described.
FIG. 7 is a diagram illustrating a cooperative operation between the bypass valve 32 and the pressure introduction valve 34. The figure shows the open state of the pressure introduction valve 34. FIG. 6 which has already been described shows a closed state of the pressure introduction valve 34.

  When the operation of the hot water supply apparatus is started, the mixing valve 30 and the pressure introduction valve 34 are energized, and each valve operates. As shown in FIG. 7, at this time, the pressure introduction valve 34 is driven to open, and the pressure in the first introduction path 42 is introduced into the high pressure chamber 102. As described above, since the pump 26 is driven during the operation of the hot water supply apparatus, the first introduction path 42 through which the high temperature water flows becomes higher in pressure than the second introduction path 44 through which the low temperature water flows. For this reason, when the pressure introducing valve 34 is opened, the high pressure chamber 102 becomes higher than the low pressure chamber 104, and the differential pressure between them acts on the diaphragm 106. As a result, the diaphragm 106 is displaced in the valve closing direction against the urging force of the spring 114, and the valve body 108 is seated on the valve seat 98 to close the bypass valve 32. Thereby, low temperature water does not flow through the bypass passage 48, and hot water mixed at an appropriate temperature by the mixing valve 30 is supplied to the hot water supply equipment.

  At the time of this hot water supply, even if an abnormality occurs in the mixing valve 30, the fail safe process by the control unit is executed. That is, when hot water having a temperature higher than the set temperature starts to be supplied due to malfunction of the mixing valve 30, the temperature sensor 52 detects this. When the detected temperature exceeds a predetermined abnormality determination value, the control unit cuts off the power supply to the pressure introduction valve 34. Thereby, as shown in FIG. 6, the pressure introduction valve 34 is closed, and the introduction of the pressure of the first introduction passage 42 into the high pressure chamber 102 is blocked. As a result, pressure leakage through the leak passage 107 is promoted, and the high pressure chamber 102 and the low pressure chamber 104 are in a pressure equalized state. At this time, the valve element 108 is pushed up by the biasing force of the spring 114, and the bypass valve 32 is opened. As a result, the low temperature water flows into the outlet passage 46 via the bypass passage 48, and the temperature of the hot water led out from the mixing valve 30 is quickly reduced. For this reason, the user can use the water supply equipment with peace of mind.

  On the other hand, when the operation of the hot water supply device is stopped, the energization to the mixing valve 30 and the pressure introduction valve 34 is cut off, and the respective valves stop operating. At this time, the pressure introduction valve 34 is closed, and the introduction of the pressure of the first introduction passage 42 into the high pressure chamber 102 is blocked. Thereby, the bypass valve 32 is opened, and the low-temperature water flows into the outlet passage 46 via the bypass passage 48 and is supplied to the hot water supply equipment.

  As described above, according to the mixing valve unit 20 of the present embodiment, even if an abnormality occurs in the mixing valve 30, it can be dealt with by closing the pressure introducing valve 34. That is, when the pressure introduction valve 34 is closed, the bypass valve 32 opens the bypass passage 48 according to the differential pressure between the high temperature water and the low temperature water, so that the low temperature water can be actively guided to the outlet path 46. Thereby, the hot water supplied to the hot water supply facility can be prevented from becoming hot water. That is, the fail safe when an abnormality occurs in the mixing valve 30 can be easily realized.

  In the present embodiment, the large-diameter bypass valve 32 is configured to operate only with a differential pressure, and the pressure introduction valve 34 is provided as a small-diameter electromagnetic valve separately from the bypass valve 32. As a result, a smaller solenoid is sufficient than when the bypass valve is a direct acting solenoid valve, and the mixing valve unit 20 can be reduced in size and power consumption. In this regard, it is conceivable to configure the bypass valve with a so-called pilot type solenoid valve. However, according to the present embodiment, there is no need to provide a movable valve seat integrated with the valve body as in the case of the pilot type solenoid valve. Can be realized with a simple configuration.

  Furthermore, since the mixing valve 30, the bypass valve 32, and the pressure introduction valve 34 are combined into a common body, the component cost of the mixing valve unit 20 can be reduced and space for installation can be reduced.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the specific embodiments, and various modifications can be made within the scope of the technical idea of the present invention. Absent.

  Although not described in the above embodiment, the diaphragm 106 may have an elastic force in the valve opening direction. If the elastic force can be sufficiently secured, the spring 114 can be omitted.

  In the above embodiment, the diaphragm 106 is employed as the pressure-sensitive member of the bypass valve 32, but a bellows may be employed. Alternatively, a bellows having a large displacement stroke may be adopted among the diaphragms. Or you may employ | adopt the piston which fitted the seal ring (O-ring etc.).

  In the above-described embodiment, the bypass valve 32 has a configuration in which the valve body 108 and the diaphragm 106 (pressure-sensitive member) are obtained by integral molding using a polymer resin material (such as rubber). In the modification, the valve body and the pressure-sensitive member may be separately manufactured and assembled together.

  In the said embodiment, the structure which provided the leak channel 107 of the bypass valve 32 in the diaphragm 106 (pressure-sensitive member) was illustrated. In a modification, you may form in the body of a mixing valve unit. Due to the pressure equalizing action by such a leak passage, for example, even when the bypass valve is suddenly closed, the occurrence of water hammer can be suppressed.

  In the above embodiment, an example in which the pressure introducing valve 34 is a normally closed solenoid valve has been described. In a modified example, the pressure introduction valve may be a normally open solenoid valve. In this case, the control unit may leave the pressure introduction valve off during normal operation of the hot water supply apparatus (target apparatus), turn on exceptionally when an abnormality is detected, and open the bypass passage. Thus, power saving can be promoted by driving the pressure introducing valve only when an abnormality occurs.

  In the above embodiment, an example in which the pressure introduction valve 34 is an electromagnetic valve has been described. In the modification, the pressure introducing valve may be a motor-driven electric valve. However, when it is sufficient that the pressure introduction valve has a function of opening and closing the high-pressure passage as in the above embodiment, the cost can be reduced by adopting a solenoid valve having a simple configuration.

  In the said embodiment, the example which applies the mixing valve unit 20 to a hot-water supply apparatus was shown. In the modification, for example, the first fluid and the second fluid having different properties may be mixed at a predetermined mixing ratio to generate a third fluid to be applied to other target devices. Good. However, it is assumed that the first fluid can have a relatively higher pressure than the second fluid when applied to the target device.

  For example, the above mixing valve unit may be applied to a device for generating chemicals and cosmetics as a target device. Specifically, the fluid containing the base substance B that does not affect the human body is used as the second fluid, and the fluid containing the additive substance A that may affect the human body at a relatively high concentration is used as the first fluid. It may be a fluid. A detection sensor capable of detecting the concentration (mixing ratio) of the additive substance A is disposed on the downstream side of the mixing valve. When the detection value by the detection sensor exceeds a predetermined reference value, the control unit cuts off the power supply to the pressure introducing valve and bypasses the second fluid downstream of the mixing valve. Thereby, the fail safe at the time of the malfunction of a mixing valve is securable. For example, the first fluid may be a fragrance and the second fluid may be air. Alternatively, the first fluid may be hypochlorous acid water for sterilization, and the second fluid may be water.

  In addition, this invention is not limited to the said embodiment and modification, A component can be deform | transformed and embodied in the range which does not deviate from a summary. Various inventions may be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments and modifications. Moreover, you may delete some components from all the components shown by the said embodiment and modification.

DESCRIPTION OF SYMBOLS 10 Hot water storage unit, 12 Heat source unit, 14 Hot water storage tank, 16 Water supply pipe, 20 Mixing valve unit, 26 Pump, 28 Hot water supply pipe, 30 Mixing valve, 32 Bypass valve, 34 Pressure introduction valve, 42 1st introduction path, 44 2nd Inlet path, 46 Outlet path, 48 Bypass path, 52 Temperature sensor, 60 Body, 62 First pipe, 64 Second pipe, 66 Third pipe, 70 Motor, 72 Mixing chamber, 74 Valve drive body, 76 Rotating shaft, 78 Valve body, 80 O-ring, 82 Flow rate adjustment hole, 96 Valve hole, 102 High pressure chamber, 104 Low pressure chamber, 106 Diaphragm, 107 Leak passage, 108 Valve body, 114 Spring, 122 Core, 124 Plunger, 130 Valve chamber, 136 High pressure Passage, 138 valve hole, 144 valve body, 146 spring.

Claims (6)

A first introduction path for introducing a first fluid having a relatively high pressure;
A second introduction path for introducing a second fluid having a relatively low pressure;
A mixing valve having a mixing chamber communicating with the first introduction path and the second introduction path, and capable of adjusting a mixing ratio of the first fluid and the second fluid;
A lead-out path communicating with the mixing chamber and leading the mixed fluid;
A bypass passage for communicating the second introduction path and the outlet path while bypassing the mixing chamber;
A bypass valve for opening and closing the bypass passage by sensing a differential pressure between the first fluid and the second fluid;
A mixing valve unit comprising: The bypass valve is
A valve hole provided in the bypass passage;
A high pressure chamber communicating with the first introduction path via a high pressure path;
A low pressure chamber communicating with the bypass passage;
Partitioning the high-pressure chamber and the low-pressure chamber, and a pressure-sensitive member that operates by sensing the differential pressure;
A valve body that is provided integrally with the pressure-sensitive member and opens and closes the valve portion in contact with and away from the valve hole;
Including
The mixing valve unit according to claim 1, further comprising a pressure introduction valve capable of opening and closing the high-pressure passage. The pressure introducing valve is a normally closed solenoid valve;
The mixing valve unit according to claim 2, wherein the bypass valve opens when the pressure introduction valve is in a closed state. A body shared by the mixing valve, the bypass valve and the pressure introducing valve;
A biasing member that biases the valve body in a valve opening direction;
A leak passage formed in the pressure-sensitive member or the body to communicate the high-pressure chamber and the low-pressure chamber, and having a flow passage section smaller than the high-pressure passage;
The mixing valve unit according to claim 2, further comprising: It is installed in a hot water supply device in which the pressure of the hot water supply pipe becomes higher than the pressure of the water supply pipe by driving the built-in pump, and the high temperature water as the first fluid and the low temperature water as the second fluid are mixed. It is configured as a mixing valve unit that makes hot water at an appropriate temperature and leads the hot water toward the hot water supply equipment.
The first introduction path is connected to the hot water supply pipe;
The second introduction path is connected to the water supply pipe;
The mixing valve unit according to claim 1, wherein the lead-out path is connected to the hot water supply facility. A water supply pipe for introducing low-temperature water from the water supply,
A heat exchanger connected to a pipe branched from the water supply pipe and supplying hot water to the hot water pipe by exchanging heat with a heat source;
A pump for generating a flow of hot water in the heat exchanger;
A mixing valve unit for mixing hot water introduced through the hot water supply pipe and low temperature water introduced through the water supply pipe into hot water having an appropriate temperature, and leading the hot water toward the hot water supply facility; ,
A temperature sensor for detecting the temperature of hot water derived from the mixing valve unit;
A control unit for controlling the mixing valve unit;
With
The mixing valve unit includes:
A first introduction path connected to the hot water supply pipe;
A second introduction path connected to the water supply pipe;
A mixing valve having a mixing chamber communicating with the first introduction path and the second introduction path, and capable of adjusting a mixing ratio of the high temperature water and the low temperature water;
A lead-out path communicating with the mixing chamber and leading the mixed fluid to the hot water supply facility;
A bypass passage for communicating the second introduction path and the outlet path while bypassing the mixing chamber;
A bypass valve that opens and closes the bypass passage according to a differential pressure between the high-temperature water and the low-temperature water;
A pressure introduction valve capable of supplying the high-pressure water pressure to the bypass valve when the valve is opened;
Including
The bypass valve is
A valve hole provided in the bypass passage;
A high pressure chamber communicating with the first introduction path via a high pressure path;
A low pressure chamber communicating with the bypass passage;
Partitioning the high-pressure chamber and the low-pressure chamber, and a pressure-sensitive member that operates by sensing the differential pressure;
A valve body that is provided integrally with the pressure-sensitive member and opens and closes the valve portion in contact with and away from the valve hole;
Including
The pressure introducing valve is a normally closed solenoid valve that opens when energized,
The bypass valve closes when the pressure introduction valve is open, and the bypass valve opens when the pressure introduction valve is closed,
The hot water supply apparatus, wherein the control unit cuts off the power supply to the pressure introduction valve when a temperature detected by the temperature sensor exceeds a predetermined abnormality determination value.

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