Dispensing valve

Abstract

The invention provides a distribution valve which is configured to control the distribution ratio and the overall flow rate of fluid and suppress leakage when the overall flow rate is zero. The distribution valve includes: a valve body having a first lead-out port, a second lead-out port, and a lead-in port; a cylindrical valve body rotatably fitted into the valve body; and a drive mechanism that rotates the valve body, in which the valve body has a peripheral wall part and a bottom surface part that function as a sealing surface part that blocks the first lead-out port, the second lead-out port, and the lead-in port, and the valve body has a cam mechanism that drives the valve body to rotate, and in which the valve body has a cam mechanism that drives the valve body to rotate, and the distribution valve distributes the fluid that has flowed into the valve body from the lead-in port to the first lead-out port and the second lead-out port to the first lead-out port and the second lead-out port. The cam mechanism is configured such that, when the valve body is rotated so as to close the introduction port, the valve body moves toward the valve seat member, and the bottom surface portion is in close contact with the seal portion.

Description

Technical Field

[0001] The present invention relates to a distribution valve for controlling the distribution of a fluid, and more particularly to a distribution valve having a blocking function for adjusting the distribution ratio and the overall flow rate of the fluid and making the overall flow rate zero. Background Art

[0002] Conventionally, for example, a hot water supply device is used, which heats low-temperature tap water using a heating unit and mixes the heated high-temperature water with tap water to adjust the temperature and supply hot water. The hot water supply device controls the heating capacity of the heating unit to adjust the temperature of the high-temperature water, and adjusts the mixing ratio of the high-temperature water to the tap water to adjust the temperature of the hot water supply.

[0003] For example, Patent Document 1 describes a mixing valve, which has: a cylindrical valve body having an opening in the peripheral wall and an open bottom; and a valve body that accommodates the valve body so that it can rotate. The valve body has water and hot water inlet ports formed at positions corresponding to the peripheral wall of the valve body, and a hot water outlet port formed at a position corresponding to the bottom of the valve body. Moreover, the mixing valve adjusts the mixing ratio of water and hot water by rotating the valve body to change the opening position of the peripheral wall, switching to only water or only hot water, or blocking both the water and hot water inlet ports at the same time. The mixing valve can be used as a mixing valve in a hot water supply device to mix hot water from a heating unit with water from a bypass passage that bypasses the heating unit.

[0004] On the other hand, there is a type of hot water supply device that distributes tap water to a heating unit and a bypass passage that bypasses the heating unit through a distribution valve, and mixes high-temperature water from the heating unit with tap water in the bypass passage to supply hot water. In this type of hot water supply device, the mixing ratio of high-temperature water and tap water is adjusted by adjusting the distribution ratio in the distribution valve. For example, the mixing valve of Patent Document 1 uses two outlets as inlets for tap water and inlets for water and hot water as two outlets for tap water, that is, the mixing valve can be used as a distribution valve by making the flow direction of the fluid reverse.

[0005] In addition, Patent Document 2 describes a valve device, which includes: a valve body in the shape of a hollow truncated cone; and a main body, which includes an inlet and multiple outlets for fluid and accommodates the valve body so that it can rotate, and the positional relationship between multiple flow passages formed on the peripheral wall of the valve body and the outlet of the main body is changed by rotating the valve body, thereby opening and closing the outlet. The valve device makes the peripheral wall of the valve body and the main body close to each other through the supply pressure of the fluid, thereby ensuring sealing and preventing leakage. The flow passage of the valve body can be changed to impart a distribution function.

[0006] [Prior art literature]

[0007] [Patent Document]

[0008] [Patent Document 1] Japanese Patent No. 5004674

[0009] [Patent Document 2] Japanese Patent Application Publication No. 2015-148288 Summary of the invention

[0010] [Problems to be solved by the invention]

[0011] The hot water supply device has sufficient heating capacity for hot water supply at about 40°C, which is often used. However, when heating low-temperature tap water at about 5°C, which requires a large heating capacity, and supplying hot water at a high temperature of about 60°C, the heating capacity is sometimes insufficient due to the large hot water supply flow rate. In this case, all the tap water is supplied to the heating unit, and the flow rate of tap water supplied to the hot water supply device is reduced to compensate for the insufficient heating capacity, so that hot water at the set temperature is supplied.

[0012] However, the mixing valve of Patent Document 1 does not have the function of adjusting the overall flow rate of the mixed hot water. Therefore, in a hot water supply device that uses such a mixing valve as a mixing valve or a distribution valve, the hot water supply flow rate is generally reduced by adjusting the flow rate adjustment valve provided on the downstream side of the mixing valve, thereby reducing the flow rate of tap water supplied to the hot water supply device. In addition, the valve device of Patent Document 2 facilitates the rotation of the valve body because the contact between the valve body and the main body is released by the cam mechanism. Therefore, when the valve body rotates, the sealing performance is reduced and leakage occurs. Therefore, it is not suitable for the precise adjustment of the distribution ratio, and it is difficult to make a distribution valve that adjusts the distribution ratio by rotating the valve body.

[0013] On the other hand, in facilities such as accommodation facilities and hospitals where a large amount of hot water is sometimes used at one time, a connection-type hot water supply system is used, which is composed of a plurality of hot water supply devices connected together, so as to be able to cope with the supply of hot water with a large flow rate. The connection-type hot water supply system changes the number of hot water supply devices in operation according to the required heating capacity to supply hot water. In the above case, a water stop valve is provided at the inlet of each hot water supply device, such as tap water, and the water stop valve of the hot water supply device that is not in operation is closed, and the number of operating units is changed by opening and closing the water stop valve. Since unheated hot water does not flow out of the hot water supply device that is not in operation, hot water of a set temperature can be supplied.

[0014] In a connected hot water supply system including a hot water supply device using a distribution valve, for example, a water stop valve is arranged on the upstream side of the distribution valve, and a flow control valve is arranged on the downstream side. The structure and control of the hot water supply device are complicated, and therefore improvement is desired. Therefore, research is being conducted to provide a flow control mechanism and a blocking mechanism at the inlet of the distribution valve, and to add a flow control function and a blocking function that function together with adjusting the distribution ratio.

[0015] For example, the bottom of the valve body of the mixing valve of Patent Document 1 is opened and closed by utilizing the rotation of the valve body, thereby adding a flow adjustment function and a blocking function. However, even if the inlet is blocked, tap water will flow into the sealing part due to the supply pressure of tap water and leak, and it is difficult to make the overall flow rate zero, especially when the supply pressure of tap water is high. In addition, the distribution ratio adjustment, flow adjustment and blocking are repeated, and the sealing part is worn, and even if the inlet of tap water is blocked, a gap through which tap water can flow is easily formed.

[0016] An object of the present invention is to provide a distribution valve configured to adjust a distribution ratio and a total flow rate of a fluid and to suppress leakage when the total flow rate is made zero.

[0017] [Technical means to solve the problem]

[0018] The distribution valve of the invention of technical solution 1 includes: a valve body having a first guide outlet, a second guide outlet and an inlet; a cylindrical valve body that can be rotatably inserted into the valve body; and a driving mechanism that rotates the valve body, the valve body having a peripheral wall portion that functions as a sealing surface portion that closes the first guide outlet and the second guide outlet, and a bottom surface portion that functions as a sealing surface portion that closes the inlet, and a first opening portion and a second opening portion that are formed on the peripheral wall portion so that the opening areas of the first guide outlet and the second guide outlet are continuously changed by the rotation of the valve body, A third opening portion is formed on the bottom portion, and the opening area of ​​the inlet port is changed within a specified range by the rotation of the valve body, so that the fluid flowing into the valve body from the inlet port is distributed to the first outlet port and the second outlet port. The distribution valve is provided with a valve seat member including a sealing portion that is sealed by abutting against the bottom portion at the inlet. The distribution valve has a cam mechanism, and the cam mechanism is configured so that when the valve body is rotated in a manner to close the inlet port, the valve body moves toward the valve seat member, and the bottom portion is in close contact with the sealing portion.

[0019] According to the structure, a valve seat member including a sealing portion abutting against the bottom surface portion of the valve body is provided at the inlet of the distribution valve for distributing the fluid introduced from the inlet into the cylindrical valve body to the first outlet and the second outlet. Furthermore, in order to stop the introduction of the fluid, when the valve body is rotated in such a manner that the inlet is blocked by the bottom surface portion of the valve body, the valve body is moved toward the valve seat member by the cam mechanism, and the bottom surface portion of the valve body is in close contact with the sealing portion. Therefore, when the valve body is rotated for adjusting the distribution ratio, the sealing portion does not come into close contact with the bottom surface portion of the valve body, so that the valve body can be easily rotated, and when the inlet is blocked, the sealing portion comes into close contact, so that the introduction of the fluid can be stopped.

[0020] The distribution valve of the invention according to claim 2 is the invention according to claim 1, wherein the cam mechanism includes a first cam mechanism including protrusions provided on a collar member supporting the valve shaft and on a top surface portion of the valve body.

[0021] According to the structure, the first cam mechanism, which is structured to make the protrusion of the top surface of the valve body abut against the protrusion of the shaft ring member by rotation, can move the valve body toward the valve seat member when the inlet is closed, so that the bottom surface of the valve body is in close contact with the sealing portion of the valve seat member.

[0022] In the distribution valve of the invention of technical solution 3 in the invention of technical solution 2, the cam mechanism has a second cam mechanism, and the second cam mechanism includes: a convex portion formed at the bottom of the valve body in a manner abutting against the bottom surface portion; and a housing portion formed on the bottom surface portion in order to accommodate the convex portion in the rotating area where the first cam mechanism functions.

[0023] According to the structure, when the inlet is blocked, the second cam mechanism of the structure in which the convex part of the bottom of the valve body is accommodated in the accommodating part of the bottom face of the valve body can ensure space for moving the valve body toward the valve seat member. In addition, when the valve body is rotated to adjust the distribution ratio, the convex part of the bottom of the valve body abuts against the bottom face of the valve body, thereby playing the function of preventing the bottom face of the valve body from being in close contact with the sealing part of the valve seat member. Therefore, the friction between the bottom face of the valve body and the sealing part during the rotation to adjust the distribution ratio can be suppressed, and the wear and damage of the valve seat member can be suppressed.

[0024] [Effects of the Invention]

[0025] According to the distribution valve of the present invention, the distribution ratio and the total flow rate of the fluid can be adjusted by rotating the valve body, and leakage can be suppressed when the total flow rate is made zero. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural diagram of a hot water supplier including a distribution valve.

[0027] Figure 2It is a perspective view of a dispensing valve according to an embodiment of the present invention.

[0028] Figure 3 yes Figure 2 Exploded view of the main parts of the distribution valve.

[0029] Figure 4 yes Figure 2 A longitudinal cross-sectional view of the distribution valve along line IV-IV.

[0030] Figure 5 This is an exploded view of the valve body.

[0031] Figure 6 It is a three-dimensional view of the collar component.

[0032] Figure 7 This is a perspective view of the valve body.

[0033] Figure 8 It is a longitudinal sectional view of the main parts of the distribution valve in the closed state.

[0034] Fig. 9 Yes means Figure 2 FIG. 1 is a diagram of an opening of a first outlet of a dispensing valve.

[0035] Fig.10 Yes means Figure 2 FIG. 1 is a diagram of the opening of the second outlet of the dispensing valve.

[0036] Fig.11 Yes means Figure 2 FIG. 1 is a diagram of the opening of the introduction port of the dispensing valve.

[0037] Fig.12 : is a graph showing the relationship between the rotation angle of the valve body and the opening areas of the first outlet, the second outlet, and the inlet.

[0038] [Explanation of Symbols]

[0039] 1: Hot water supply device

[0040] 3: Heat exchanger

[0041] 4: Water supply access

[0042] 5: Hot water outflow passage

[0043] 6: Bypass path

[0044] 7: Control mechanism

[0045] 10: Distribution valve

[0046] 11: Valve body

[0047] 11a, 11b: convex part

[0048] 12: Driving unit (driving mechanism)

[0049] 13: First export outlet

[0050] 14: Second export outlet

[0051] 15: Import port

[0052] 16: Mounting plate

[0053] 20: Valve body

[0054] 21: First valve body

[0055] 21a: Top face

[0056] 21b: Peripheral wall

[0057] 22: Valve shaft

[0058] 23: First opening

[0059] 24: Second opening

[0060] 25a, 25b: protrusion

[0061] 26: Second valve body

[0062] 26a: Bottom

[0063] 26d, 26e: Containment

[0064] 27: The third opening

[0065] 30: Collar component

[0066] 31a, 31b: protrusion

[0067] 40: Valve seat component

[0068] 41: Cylinder

[0069] 42: Top face

[0070] 43: Sealing part

[0071] 44: Slot DETAILED DESCRIPTION

[0072] Hereinafter, the mode for carrying out the present invention will be described based on examples.

[0073] [Example]

[0074] First, a hot water supply device to which the distribution valve of the present invention can be applied will be described.

[0075] like Figure 1As shown, the hot water supply device 1 is a combustion type hot water supply device: it has a combustion device 2 including a burner and a blower fan, etc., and a heat exchanger 3, and includes a heating unit that uses the combustion heat generated in the combustion device 2 to heat tap water in the heat exchanger 3. The hot water supply device 1 includes: a water supply passage 4 that supplies tap water to the heat exchanger 3, a hot water outflow passage 5 that allows hot water from the heat exchanger 3 to flow out, a distribution valve 10 inserted in the water supply passage 4, a bypass passage 6 that branches from the water supply passage 4 in the distribution valve 10 and is connected to the hot water outflow passage 5, and a control mechanism 7 that controls hot water supply. The distribution valve 10 distributes the supplied tap water to the heat exchanger 3 side and the bypass passage 6 side that bypasses the heating unit. The heat exchanger 3 has a latent heat recovery heat exchanger, and the hot water supply device 1 is equipped with a neutralizer 9 that neutralizes and discharges the strongly acidic drain water (drain water) condensed from the water contained in the combustion exhaust gas.

[0076] In the hot water outflow passage 5, a hot water supply temperature sensor 8a is provided on the downstream side of the connection portion with the bypass passage 6. In the water supply passage 4, a water supply temperature sensor 8b and a water supply flow sensor 8c are provided on the downstream side of the distribution valve 10. The control mechanism 7 controls the combustion heat generated in the combustion device 2 based on the detected temperature of the water supply temperature sensor 8b and the detected flow of the water supply flow sensor 8c, and controls the distribution ratio of the distribution valve 10 so that the detected temperature of the hot water supply temperature sensor 8a becomes the set hot water supply set temperature. The flow rate (total flow rate) of tap water introduced into the hot water supply device 1 is calculated based on the detected flow of the water supply flow sensor 8c and the distribution ratio of the distribution valve 10.

[0077] The distribution valve 10 is controlled so that the greater the heating capacity required for hot water supply at the hot water supply setting temperature, the greater the distribution to the heat exchanger 3. In addition, the distribution valve 10 is controlled so that the total flow rate is reduced or zero as needed.

[0078] Next, the distribution valve 10 will be described.

[0079] like Figure 2 As shown, the distribution valve 10 is equipped with a driving unit 12 (driving mechanism) having, for example, a stepping motor in the valve body 11. Here, the distribution valve 10 is described as being equipped on the hot water supply device 1 with the driving unit 12 facing upward. Arrows U, F, and L in the figure respectively indicate the upper side, the front side, and the left side of the distribution valve 10. In addition, the posture of the distribution valve 10 can be appropriately changed according to the equipment to be installed.

[0080] The valve body 11 is formed of, for example, a synthetic resin, and has a first outlet 13 and a second outlet 14 on the side surface, and an inlet 15 on the bottom. The drive unit 12 is fixed to the mounting plate 16 on the upper portion of the valve body 11 by a plurality of fastening members 17. When the distribution valve 10 is inserted into the water supply passage 4, the inlet 15 and the second outlet 14 are connected to the water supply passage 4, and the bypass passage 6 is connected to the first outlet 13. The tap water indicated by the arrow WI introduced upward into the inlet 15 is distributed into the tap water supplied from the first outlet 13 to the bypass passage 6 as indicated by the arrow WO1, and the tap water supplied from the second outlet 14 to the heat exchanger 3 as indicated by the arrow WO2.

[0081] like Figure 3 , Figure 4 As shown, a cylindrical valve body 20 formed of, for example, a synthetic resin is rotatably inserted into a space formed in a cylindrical shape inside the valve body 11. A valve shaft 22 concentric with the central axis C of the valve body 20 extends from a top surface portion 21a covering the top surface of the valve body 20 to the outside of the valve body 11. A collar member 30 that rotatably supports the valve shaft 22 is inserted into the valve body 11 together with the valve body 20. These valve bodies 20 and collar members 30 are fixed to the mounting plate 16 of the valve body 11 by a plurality of fastening members 18 to prevent them from falling off the valve body 11. In order to rotationally drive the valve body 20 via the valve shaft 22 by the drive unit 12 fixed to the mounting plate 16, a portion of the valve shaft 22 is serrated. In addition, illustration and description of the internal structure of the drive unit 12 are omitted.

[0082] Two protrusions 25a and 25b with different distances from the valve shaft 22 are formed on the top surface 21a of the valve body 20 so as to face each other across the valve shaft 22. Two O-rings 22a are installed on the valve shaft 22 to seal the valve shaft 22 with the collar member 30 in a watertight manner. In addition, an O-ring 30a is installed on the outer periphery of the collar member 30 to seal the valve body 11 in a watertight manner. The insertion portion 32 of the collar member 30 inserted into the mounting plate 16 has an opening 32a for inserting the valve shaft 22, and a rotation limiting portion 33 is formed on the outer periphery to prevent the collar member 30 from engaging with the mounting plate 16 and rotating together with the valve body 11.

[0083] In the inlet 15, a valve seat member 40 made of elastic synthetic rubber is inserted into the communicating portion 15a of the inlet 15 at the bottom of the valve body 11. The valve seat member 40 has a cylindrical portion 41 formed in a cylindrical shape, a top surface portion 42, and a sealing portion 43 extending from the top surface portion 42 toward the valve body 20 and sealing by contacting with the bottom surface portion 26a of the valve body 20.

[0084] A groove 44 surrounding the outer periphery of the sealing portion 43 is formed on the top surface portion 42 along the base end portion of the sealing portion 43. The sealing portion 43 is formed in a cylindrical shape with an opening shape that is roughly fan-shaped, and the introduction port 15 and the internal space of the cylindrical valve body 20 can be communicated through the inner side of the cylindrical sealing portion 43 inserted into the communication portion 15a and the inner side of the cylindrical portion 41. In addition, the outer periphery of the cylindrical portion 41 is in close contact with the inner periphery of the introduction port 15, and the outer periphery of the sealing portion 43 is in close contact with the communication portion 15a, and the valve seat member 40 and the introduction port 15 are sealed.

[0085] Next, the valve body 20 will be described.

[0086] like Figure 3 , Figure 5 As shown in the figure, a disc-shaped second valve body 26 having a bottom surface 26a is inserted into the open end of a first valve body 21 having a cylindrical peripheral wall 21b and a top surface 21a to form a valve body 20. A plurality of key grooves 21c are formed on the inner periphery of the peripheral wall 21b of the first valve body 21. A plurality of keys 26b corresponding to the plurality of key grooves 21c of the first valve body 21 are formed on the second valve body 26.

[0087] The plurality of keys 26b corresponding to the plurality of key grooves 21c prevent the first valve body 21 and the second valve body 26 from rotating relative to each other, and perform positioning in the circumferential direction, so that the first valve body 21 and the second valve body 26 rotate integrally. The peripheral wall portion 21b slides relative to the inner peripheral surface surrounding the side surface of the space formed in a cylindrical shape inside the valve body 11, and functions as a sealing surface portion that closes the first outlet 13 and the second outlet 14 of the valve body 11. The bottom surface portion 26a functions as a sealing surface portion that closes the introduction port 15 of the valve body 11.

[0088] The first valve body 21 has a first opening 23 for communicating the internal space of the valve body 20 with the first outlet 13 on the upper side of the peripheral wall 21b (the top surface 21a side). The first valve body 21 has a second opening 24 for communicating the internal space of the valve body 20 with the second outlet 14 on the lower side of the peripheral wall 21b (the open end side). The first opening 23 and the second opening 24 are formed so that the opening width (height) in the axial direction changes when moving in the circumferential direction. In addition, a plurality of reinforcing ribs 21d are formed on the first valve body 21 in a manner protruding into the internal space to reinforce the peripheral wall 21b and the top surface 21a. The radial and axial deformation of the first valve body 21 can be suppressed by these reinforcing ribs 21d.

[0089] The second valve body 26 has a plurality of third openings 27 for communicating the internal space of the valve body 20 with the inlet 15. The bottom surface 26a has an annular outer peripheral portion and a fan-shaped portion connecting the annular outer peripheral portion and its central portion, and occupies about half of the axial projection area of ​​the valve body 20. In order to suppress the deformation (axial displacement) of the bottom surface 26a, a plurality of reinforcing ribs 26c connecting the annular outer peripheral portion and its central portion are radially formed on the bottom surface 26a on the side facing the internal space of the valve body 20. The reinforcing ribs 26c are also formed in the third opening 27. In addition, two receiving portions 26d and 26e are formed in a part of the outer peripheral portion of the bottom surface 26a, and the receiving portions 26d and 26e have inclined surfaces that are recessed toward the first valve body 21 side.

[0090] Next, the collar member 30 will be described.

[0091] like Figure 4 , Figure 6 As shown, the collar member 30 has two protrusions 31a and 31b protruding toward the top surface portion 21a on the side facing the top surface portion 21a of the valve body 20. The protrusion 31a is formed corresponding to the protrusion 25a of the valve body 20, and the protrusion 31b is formed corresponding to the protrusion 25b of the valve body 20. These protrusions 31a and 31b extend in the circumferential direction at a rotation angle of about 30 degrees in a concentric shape with the valve shaft 22 so as to face each other across the opening portion 32a through which the valve shaft 22 is inserted.

[0092] Next, the cam mechanism of the distribution valve 10 will be described.

[0093] When the valve body 20 is rotated rightward (clockwise when viewed from above), the protrusions 25a and 25b of the valve body 20 abut against the corresponding protrusions 31a and 31b. The protrusions 31a and 31b are formed in an inclined shape such that the amount of protrusion increases as the protrusions 25a and 25b initially abut against each other toward the right.

[0094] When the protrusions 25a and 25b of the valve body 20 rotating clockwise come into contact with the corresponding inclined protrusions 31a and 31b of the collar member 30 and rotate further, the valve body 20 rotates so that the protrusions 25a and 25b are inserted under the protrusions 31a and 31b. Figure 8 As shown, the valve body 20 moves in the axial direction and away from the collar member 30 fixed to the valve body 11. Thus, the protrusions 25a, 25b and the protrusions 31a, 31b constitute a first cam mechanism for moving the valve body 20 in the axial direction.

[0095] When the first cam mechanism rotates the valve body 20 to the right, the protrusions 25a and 25b of the valve body 20 are finally stopped by the step-shaped stoppers 31c and 31d, thereby limiting the further rotation and axial movement of the valve body 20. When the valve body 20 is rotated to the left from the above state and the protrusions 25a and 25b are separated from the protrusions 31a and 31b, the first cam mechanism does not function. In addition, when the valve body 20 is rotated, the protrusions 25b of the valve body 20 do not interfere with the protrusions 31a, and the protrusions 25a and 31b of the valve body 20 do not interfere with each other because of the different distances from the valve shaft 22.

[0096] like Figure 4 , Figure 7 As shown, two hemispherical protrusions 11a and 11b are formed near the outer periphery of the inner bottom of the valve body 11 away from the valve seat member 40. When the valve body 20 rotates, the bottom surface 26a of the valve body 20 slides relative to the two protrusions 11a and 11b, and the sealing portion 43 of the valve seat member 40 is not in close contact with the bottom surface 26a, so that the sliding resistance during rotation becomes small.

[0097] like Figure 8 As shown, when the valve body 20 is rotated to the right and the first cam mechanism is functioning, the convex portion 11a is accommodated in the corresponding accommodation portion 26d of the bottom surface portion 26a, and the convex portion 11b (not shown) is accommodated in the corresponding accommodation portion 26e. In this way, the movement space of the valve body 20 toward the valve seat member 40 side can be ensured, and the sealing portion 43 is pressed to the bottom surface portion 26a for close contact. When the valve body 20 is rotated to the left from here, the valve body 20 rotates and moves to the collar member 30 side by the contact between the inclined surface connected from the accommodation portion 26d and the accommodation portion 26e to the bottom surface portion 26a and the convex portion 11a and the convex portion 11b. Moreover, when the first cam mechanism is not functioning, the convex portion 11a and the convex portion 11b contact the bottom surface portion 26a. In this way, the convex portion 11a and the convex portion 11b and the accommodation portion 26d and the accommodation portion 26e constitute the second cam mechanism.

[0098] Since the distribution valve 10 has a first cam mechanism on the top surface 21a side of the valve body 20 and a second cam mechanism on the bottom surface 26a side as a cam mechanism, the axial movement of the valve body 20 is smooth, and when water is stopped, the valve body 20 moves toward the valve seat member 40, and the bottom surface 26a is in close contact with the sealing portion 43.

[0099] like Fig. 9 As shown, the first outlet 13 communicates with the internal space of the valve body 20 via the communicating portion 13a having a semicircular opening with a straight lower end and the first opening 23 of the valve body 20. Fig.10As shown, the second outlet 14 communicates with the internal space of the valve body 20 via the communicating portion 14a having a semicircular opening with a straight upper end and the second opening 24 of the valve body 20. Fig.11 As shown, the inlet 15 provided with the valve seat member 40 communicates with the internal space of the valve body 20 via the inner side of the cylindrical portion 41 of the valve seat member 40 , the inner side of the fan-shaped sealing portion 43 , and the third opening 27 of the valve body 20 .

[0100] By the rotation of the valve body 20, the opening area of ​​the first opening 23 communicating with the first outlet 13, the opening area of ​​the second opening 24 communicating with the second outlet 14, and the opening area of ​​the third opening 27 communicating with the inlet 15 are continuously changed within a predetermined range. Fig. 9 The opening area of ​​the first outlet 13 is the largest, and Fig.10 The opening area of ​​the second outlet 14 is not a small prescribed opening area of ​​zero, and as shown in FIG. Fig.11 The case where the opening area of ​​the introduction port 15 is substantially the largest is the initial state of the valve body 20 with the rotation angle being 0 degrees. The predetermined range is from the maximum to zero (closed), and the maximum value of the opening area can be set appropriately.

[0101] like Fig.12 As shown in FIG. 1 , when the valve body 20 is rotated clockwise from the initial state, the opening area of ​​the first outlet 13 decreases, and the opening area of ​​the second outlet 14 increases, but the opening area of ​​the introduction port 15 increases slightly and then is maintained at the maximum. The total opening area of ​​the first outlet 13 and the second outlet 14 is set to be larger than the opening area of ​​the introduction port 15, so that the pressure of the tap water on the downstream side of the distribution valve 10 is lower than that on the upstream side. Moreover, after the opening area of ​​the introduction port 15 starts to decrease, the opening area of ​​the second outlet 14 becomes the largest.

[0102] When the valve body 20 is further rotated, the opening areas of the first outlet 13, the second outlet 14, and the inlet 15 become smaller. Finally, for example, when the valve body 20 is rotated 260 degrees to the right from the initial state, the first outlet 13, the second outlet 14, and the inlet 15 are blocked to stop water flow, and rotation of more than 270 degrees is restricted. Immediately before the blocking, after the opening area of ​​the first outlet 13 becomes the smallest, the opening area of ​​the second outlet 14 becomes the smallest, and the sum (total) of the opening areas of the first outlet 13 and the second outlet 14 is smaller than the opening area of ​​the inlet 15. For example, when the valve body 20 is rotated 259 degrees, the opening area of ​​the inlet 15 becomes twice the sum of the opening areas of the first outlet 13 and the second outlet 14.

[0103] Moreover, since the first outlet 13 and the second outlet 14 are blocked before the inlet 15, the tap water is supplied to the valve body 20 in which the first outlet 13 and the second outlet 14 are blocked, and thus the differential pressure of the tap water on the upstream side and the downstream side of the bottom surface 26a is reduced. Since the inlet 15 is blocked in the state where the differential pressure is reduced, the deformation of the bottom surface 26a caused by being pressed by the tap water is suppressed, the close contact between the bottom surface 26a and the sealing portion 43 is improved, and leakage is suppressed. In addition, compared with the case where the differential pressure is not reduced, the bottom surface 26a and the sealing portion 43 can be in close contact in a state where the sliding resistance is small, so the wear and damage of the sealing portion 43 can be suppressed.

[0104] Regarding the tap water introduced from the introduction port 13, the tap water distributed to the second outlet 14 on the heat exchanger 3 side is the least in the initial state, and most of it is distributed to the first outlet 13 on the bypass passage 6 side. When the valve body 20 is rotated clockwise, the tap water distributed to the first outlet 13 is reduced, and the tap water distributed to the second outlet 14 is increased. In normal hot water supply of the hot water supply device 1, the valve body 20 is rotated in a region where one of the first outlet 13 and the second outlet 14 increases while the other decreases to adjust the distribution ratio.

[0105] When the heating capacity is likely to be insufficient, such as when supplying high-temperature hot water, the valve body 20 is further rotated to reduce the tap water distributed to the first outlet 13 to zero, and all the tap water introduced from the introduction port 13 is supplied to the second outlet 14. In addition, when the heating capacity is insufficient due to a large overall flow rate, the valve body 20 is further rotated to reduce the opening area of ​​the introduction port 15, thereby limiting the introduction of tap water and reducing the overall flow rate.

[0106] When the hot water supply device 1 is one of the hot water supply devices constituting the connected hot water supply system and corresponds to a non-operating hot water supply device, the valve body 20 is rotated so as to block the inlet 15, thereby making the total flow rate zero. Figure 8 As shown in FIG. 1 , the valve body 20 moves toward the valve seat member 40 through the cam mechanism, and the sealing portion 43 is in close contact with the bottom surface portion 26a of the valve body 20, thereby preventing tap water from flowing into the valve body 11. In addition, since the differential pressure between the upstream side and the downstream side of the bottom surface portion 26a is eliminated, the close contact between the sealing portion 43 and the bottom surface portion 26a is improved. Therefore, in addition to the fluid distribution function, the distribution valve 10 also has a function of adjusting the overall flow rate and a blocking function of making the overall flow rate zero, so that the flow rate adjustment valve commonly equipped and the water stop valve equipped in the use of the connection type hot water supply system can be omitted.

[0107] The function and effect of the distribution valve 10 will be described.

[0108] The distribution valve 10 for distributing the fluid flowing into the valve body 20 from the introduction port 15 to the first outlet 13 and the second outlet 14 includes: a cylindrical valve body 20 rotatably inserted into the valve main body 11; and a drive unit 12 (drive mechanism) for rotating the valve body 20. The valve body 20 has a peripheral wall portion 21b that functions as a sealing surface portion that blocks the first outlet 13 and the second outlet 14, and a bottom surface portion 26a that functions as a sealing surface portion that blocks the introduction port 15. The first opening portion 23 and the second opening portion 24 are formed in the peripheral wall portion 21b so that the opening area of ​​the first outlet 13 and the opening area of ​​the second outlet 14 are continuously changed by the rotation of the valve body 20. The third opening portion 27 is formed in the bottom surface portion 26a so that the opening area of ​​the introduction port 15 is changed within a predetermined range by the rotation of the valve body 20.

[0109] The inlet 15 of the distribution valve 10 that distributes the fluid introduced into the cylindrical valve body 20 to the first outlet 13 and the second outlet 14 is provided with a valve seat member 40 including a sealing portion 43 that contacts the bottom surface 26a of the valve body 20. In order to stop the introduction of the fluid, when the valve body 20 is rotated so as to close the inlet 15, the valve body 20 moves toward the valve seat member 40 by the cam mechanism, and the bottom surface 26a of the valve body 20 contacts the sealing portion 43. Therefore, when the valve body 20 is rotated to adjust the distribution ratio, the bottom surface 26a of the valve body 20 does not contact the sealing portion 43, so the valve body 20 can be easily rotated. In addition, when the inlet 15 is closed, the sealing portion 43 contacts, so the introduction of the fluid can be stopped only by the distribution valve 10.

[0110] The cam mechanism has a first cam mechanism, which includes protrusions 31a, 31b and protrusions 25a, 25b respectively provided on the collar member 30 supporting the valve shaft 22 and the top surface portion 21a of the valve body 20. The first cam mechanism has a simple structure in which the protrusions 25a, 25b of the valve body 20 are brought into contact with the protrusions 31a, 31b of the collar member 30 by rotation, so that when the introduction port 15 is closed, the valve body 20 can be moved toward the valve seat member 40, so that the bottom surface portion 26a of the valve body 20 is brought into close contact with the sealing portion 43 of the valve seat member 40.

[0111] In addition, the cam mechanism includes a second cam mechanism including: convex portions 11a and 11b formed on the bottom of the valve body 11 so as to abut against the bottom surface portion 26a; and receiving portions 26d and 26e formed on the bottom surface portion 26a to receive the convex portions 11a and 11b in a rotation region where the bottom surface portion 26a is in close contact with the sealing portion 43. When the introduction port 15 is closed, the convex portions 11a and 11b on the bottom of the valve body 11 are received in the receiving portions 26d and 26e of the bottom surface portion 26a of the valve body 20, thereby ensuring a space for the valve body 20 to move toward the valve seat member 40. In addition, when the valve body 20 for adjusting the distribution ratio rotates, the convex parts 11a and 11b at the bottom of the valve body 11 abut against the bottom surface part 26a of the valve body 20, thereby preventing the bottom surface part 26a of the valve body 20 from being in close contact with the sealing part 43 of the valve seat member 40. Therefore, the friction between the bottom surface part 26a and the sealing part 43 during the rotation of the valve body 20 for adjusting the distribution ratio can be suppressed, and the wear and damage of the valve seat member 40 can be suppressed.

[0112] The distribution valve 10 can also be applied to equipment other than the hot water supply device 1, and the fluid can also be a fluid other than tap water. In addition, those skilled in the art can implement the above-mentioned embodiment in various ways without departing from the main purpose of the present invention, and the present invention includes such changes.

Claims

1. A dispensing valve, comprising: The valve body has a first outlet, a second outlet and an inlet; A cylindrical valve body, rotatably inserted into the valve body; The closure of the valve body is shaped like a circle, and the closure of the valve body is shaped like a circle. The closure of the valve body is shaped like a circle, and the closure of the valve body is shaped like a circle. The closure of the valve body is shaped like a circle, and the closure of the valve body is shaped like a circle. A valve seat component including a sealing portion that is sealed by abutting against the bottom surface portion is provided at the inlet, and the distribution valve has a cam mechanism. The cam mechanism is configured so that when the valve body is rotated in a manner to close the inlet, the valve body moves toward the valve seat component and the bottom surface portion is in close contact with the sealing portion.

2. The dispensing valve according to claim 1, characterized in that: The cam mechanism includes a first cam mechanism including protrusions provided on a collar member supporting the valve shaft and the top surface portion of the valve body, respectively.

3. The dispensing valve according to claim 2, characterized in that: The cam mechanism has a second cam mechanism, which includes: a convex portion formed on the bottom of the valve body in a manner abutting against the bottom surface portion; and a receiving portion formed on the bottom surface portion to receive the convex portion in a rotation area where the bottom surface portion and the sealing portion are in close contact.

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