JP6620310B2 - Flow path switching valve and hot water supply device including the same - Google Patents

Description

  The present invention relates to a flow path switching valve and a hot water supply device including the same.

  Conventionally, as a flow path switching means rotating shaft used in this type of hot water supply apparatus, there is one using a closing valve body (see, for example, Patent Document 1).

  As shown in FIG. 8, this flow path switching means is provided with a rotary closing valve body 23 in the body 19 of the flow path switching valve, and the rotary shaft 24 of the closing valve body 23 is electrically driven. By being driven by a drive unit 26 having a motor, the rotary closing valve body 23 rotates around the axis, and the flow path is switched.

  An O-ring 27 is disposed around the rotating shaft 24 to prevent the fluid in the main body 19 of the flow path switching valve from leaking to the outside. In addition, the stop valve body 23 is pivotally supported by the main body 19.

  The shut-off valve body 23 slides (moves) along the main body 19 in the Z-axis direction. A through-hole 29 is provided in the shut-off valve body 23, and the through-hole 29 is an outlet to the first outflow port (hot water tank lower flow path) 21 opened in the main body 19 of the flow path switching valve. The outlet shape coincides with the outlet to the outlet port (hot water tank upper flow path) 22.

JP 2015-172403 A

  However, since the closing valve body 23 and the rotating shaft 24 are integrated in the conventional configuration, the closing valve body is made of a soft material having high closing performance, and the rotating shaft is made of a hard material having high strength. In addition, when the closing valve body 23 is molded from resin, a parting line is formed on the closing valve body, and the adhesion between the main body 19 and the closing valve body 23 is lowered to reduce the valve. There was a problem that leakage occurred.

  In addition, when the parting line on the shut-off valve body is cut, chips are generated and may be sandwiched between the main body 19 and the shut-off valve body 23, leading to water leakage. There was also a problem that it was necessary to remove waste, resulting in a decrease in production efficiency and an increase in cost.

  This invention solves the said conventional subject, and it aims at providing the flow-path switching valve excellent in closing performance, and a hot-water supply apparatus provided with the same.

In order to solve the conventional problems, a flow path switching valve according to the present invention includes at least one inflow port, a main body having a plurality of outflow ports, and rotating to at least one of the inflow ports and the plurality of outflow ports. bract have a transmembrane hole for communicating the shut-off valve body is made of a resin material or rubber material, in a different component than said shutoff valve body, by rotating the closure valve body from the closed valve body A rotating shaft formed of a hard material ; a support portion formed at a lower portion of the rotating shaft; supporting the closing valve body on a lower surface of the closing valve body; and having a larger outer diameter than the rotating shaft; and the rotating shaft And the closing valve body and the rotary shaft are fitted so as to rotate at the same time, and due to the action of the internal pressure of the main body on the support portion, the rotary shaft is By moving in a predetermined direction, Valve body is also moved in the moving direction and the same direction of the rotating shaft by the supporting portion, among the plurality of outlet ports, the upper surface of the closure valve body is not through the through hole and communicating said shutoff valve body The outflow port is configured to be closed .

  As a result, the closing valve body and the rotating shaft can be configured as separate parts, so a material with high closing performance is selected for the closing valve body, and a high-strength material is selected for the rotating shaft. Since the ring line does not touch the closing surface of the closing valve body, the adhesion between the main body and the closing valve is improved, and water leakage can be prevented.

  ADVANTAGE OF THE INVENTION According to this invention, the flow-path switching valve excellent in closing performance and the hot water supply apparatus provided with the same can be provided.

Circuit diagram of hot water supply apparatus in Embodiment 1 of the present invention Sectional drawing of the flow-path switching valve in Embodiment 1 of this invention A top view and a front view of the closing valve body of the flow path switching valve Top view and front view of the rotation shaft of the flow path switching valve Bottom view when the flow path switching valve is switched to the hot water tank lower flow path Bottom view when the flow path switching valve is switched to the hot water tank upper flow path Sectional view of the flow path switching valve in an abnormally pressurized state from the outlet of the flow path switching valve Sectional drawing of the flow path switching valve used for the conventional hot-water supply apparatus

The first invention have a body and, transmural hole for communicating with at least one of said plurality of outlet ports and the inlet port by rotating with at least one inlet port, a plurality of outlet ports, the resin A closing valve body formed of a material or a rubber material, and a rotating shaft formed of a material harder than the closing valve body by rotating the closing valve body separately from the closing valve body, and the rotation formed under the shaft, the closure valve body to support the lower surface of the shutoff valve body, comprising an outer diameter greater than the support portion of the rotary shaft, and a drive unit for rotating the rotary shaft, said shutoff valve body And the rotating shaft are fitted so as to rotate at the same time, and the rotating shaft moves in a predetermined direction by the action of the internal pressure of the main body on the support portion , whereby the closing valve body also transfer of the rotary shaft by the support portion Go to the same direction, the plurality of outlet ports, and characterized in that the upper surface of the closure valve body and configured to close the outlet port that is not through the through hole and communicating said shutoff valve body This is a flow path switching valve.

  As a result, the rotating shaft and the shut-off valve can be configured as separate parts, so the shut-off valve body can be composed of different materials, such as using a soft material with high closing performance, and the rotating shaft using a hard material with high strength. And the closing performance is improved. In addition, since the parting line does not stick to the closing surface when the shut-off valve is made by resin molding, the closing performance can be improved, and it is not necessary to remove the parting line and the associated chips. A simple flow path switching valve can be provided.

  A second aspect of the invention comprises a hot water storage tank for storing hot water, a water supply pipe for supplying water to the hot water storage tank, a pressure reducing valve provided in the water supply pipe, and a heating means for heating the hot water. Whether the lower hot water is returned to the upper part of the hot water tank or the lower part of the hot water tank via the heating means is switched by the flow path switching valve according to the first invention. This is a hot water supply device.

  As a result, when the hot water at the lower part of the hot water tank is returned to the upper or lower part of the hot water tank via the heating means, the flow path can be switched without causing valve leakage, resulting in a decrease in thermal efficiency. I can prevent it.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a schematic configuration diagram of a hot water supply apparatus including a flow path switching valve according to Embodiment 1 of the present invention.

  In FIG. 1, the hot water supply apparatus includes a hot water tank 1 and a heat pump heat source 2 as heating means. The water supplied from the water supply source passes through the water supply pipe 3 and the pressure reducing valve 4, branches to the lower part of the hot water tank 1 and the hot water supply mixing valve 5, and the water introduced from the lower part of the hot water tank 1 is stored in the hot water tank 1.

  The lower part of the hot water tank 1 and the heat pump heat source 2 are connected by a heat pump forward pipe 7 via a boiling pump 6.

  A compressor 8 is built in the heat pump heat source 2, and heat is exchanged with hot water introduced into the heat pump heat source 2 to raise the temperature, and the heat pump return pipe 9 and the hot water tank lower return pipe 10 are passed through. It is designed to return to the bottom. A flow path switching valve 11 is provided between the heat pump return pipe 9 and the hot water tank lower return pipe 10.

  In the initial stage of boiling, the temperature of the hot water returning from the heat pump heat source 2 is low (for example, less than 60 ° C.), and in that case, the flow path of the flow path switching valve 11 is used to boil the hot water. The hot water tank 1 is supplied to the lower part of the hot water tank 1.

  When the hot water temperature returned from the heat pump heat source 2 becomes high (for example, 60 ° C. or higher), the flow path of the flow path switching valve 11 passes through the hot water tank return pipe 12 and returns to the upper part of the hot water tank 1. It is like that.

  That is, the heat pump forward pipe 7, the heat pump return pipe 9, the hot water tank lower return pipe 10 or the hot water tank upper return pipe 12 are connected to each other, and the hot water in the lower part of the hot water tank 1 flows toward the upper part of the hot water tank 1, A heating circuit for heating the hot water in the tank 1 is formed.

  The hot water stored in the upper part of the hot water tank 1 and the water branched from the water supply pipe 3 are mixed by the hot water supply mixing valve 5 and discharged from the faucet 18 through the hot water temperature sensor 16 and the flow rate sensor 17.

  An inlet water temperature sensor 13 for measuring the incoming water temperature is provided at the inlet of the heat pump heat source 2, and a hot water temperature sensor 14 for detecting the outlet temperature of the hot water from the heat pump heat source 2 is provided at the outlet. 15 is sent.

  The detected temperature is used to adjust the output of the compressor 8, and the flow path switching valve 11 is controlled by the temperature information of the hot water temperature sensor 14.

  FIG. 2 shows a cross-sectional view of the flow path switching valve 11 of the first embodiment. In FIG. 2, an inflow port 20, a first outflow port 21, and a second outflow port 22 are provided in the main body 19 of the flow path switching valve 11 with at least one inflow path and a plurality of outflow paths. ing.

  In the present embodiment, at least three flow paths are provided in the main body 19, and the hot water heated by the heat pump heat source 2 is returned to the inflow port 20 side by being connected to the heat pump return pipe 9. The heat pump return flow path is configured.

  A hot water tank upper return pipe 12 is connected to the first outflow port 21 side, and constitutes a hot water tank upper flow path for sending hot water to the upper part of the hot water tank 1. A tank lower return pipe 10 is connected to form a hot water tank lower flow path for sending hot water to the lower part of the hot water tank 1.

  In the present embodiment, the main body 19 is integrally formed. However, the main body 19 is configured by combining a plurality of members as long as the main body 19 has the flow paths in at least the three directions described above. It does not matter.

  A rotary closing valve body 23 is installed inside the main body 19 of the flow path switching valve 11, and the rotary closing valve body 23 and the rotary shaft 24 are provided with a rotation stopper 25. At the same time that 24 rotates, the closing valve body 23 also rotates.

  The rotary shaft 24 is driven by a drive unit 26 having an electric motor, so that the rotary closing valve body 23 rotates about the Z axis and the flow path is switched.

  An O-ring 27 is disposed around the rotary shaft 24 to prevent the fluid in the main body 19 of the flow path switching valve 11 from leaking to the outside.

Thereby, the shut-off valve body 23 is pivotally supported by the main body 19. A support portion 28 that supports the closing valve body 23 from below is formed below the rotating shaft 24 so as to be larger than the outer diameter of the rotating shaft 24.

  FIG. 3 shows a top view and a front view of the closing valve body 23. FIG. 4 shows a top view and a front view of the rotating shaft.

  A rotation stop projection 31 provided on the rotation shaft 24 is fitted into the notch 30 of the closing valve body 23 so that the closing valve body 23 rotates around the Z axis simultaneously with the rotation of the rotation shaft 24.

  FIG. 5 shows a bottom view when the flow path switching valve 11 is switched to the first outlet port (hot water tank lower flow path) 21 side.

  The through hole 29 opened in the rotary closing valve body 23 in the main body 19 of the flow path switching valve 11 and the outlet to the hot water tank lower flow path 21 coincide with each other, and the hot water flowing out from the heat pump return pipe 9 flows through the flow path. It flows from the inflow port 20 of the switching valve 11 and flows into the hot water tank lower return pipe 10 via the hot water tank lower flow path 21. Thereafter, the hot water is supplied from the lower part of the hot water tank 1 into the hot water tank 1.

  FIG. 6 shows a bottom view when the flow path switching valve 11 is switched to the second outflow port (hot water tank upper flow path) 22 side.

  The through hole 29 opened in the rotary closing valve body 23 in the main body 19 of the flow path switching valve 11 and the hot water tank upper flow path 22 coincide with each other, and the hot water flowing out from the heat pump return pipe 9 flows into the flow path switching valve 11. It flows in from the inflow port 20 and flows into the hot water tank upper return pipe 12 through the hot water tank upper flow path 22.

  Thereafter, the hot water is supplied from the upper part of the hot water tank 1 into the hot water tank 1. In order to switch the outlet of the hot water flowing in from the heat pump return pipe 9 from the hot water tank upper flow path 22 to the hot water tank lower flow path 21, the drive unit 26 is driven to rotate the rotary closing valve body 23 at a predetermined angle (this embodiment). This can be realized by rotating 180 degrees).

  Next, the operation and action will be described. For hot water storage in the hot water tank 1, the position of the rotary closing valve body 23 is set so that the hot water flowing from the inflow port 20 flows to the hot water tank upper flow path 22 through the flow path switching valve 11.

  Thereby, hot water is stored in the upper part of the hot water tank 1. When hot water storage in the hot water storage tank 1 is completed, the rotary closing valve body 23 is set at a predetermined angle (so that hot water flowing from the inflow port 20 flows into the hot water tank lower flow path 21 through the flow path switching valve 11. In this embodiment, it is rotated 180 degrees.

  As a result, the hot water tank upper flow path 22 is closed by the closing valve body 23, and hot water stored in the upper part of the hot water tank 1 is prevented from convection to the lower part of the hot water tank 1.

  Here, the rotary shaft 24 moves in the Z-axis direction shown in FIG. 2 due to the action of internal pressure on the main body 19, and the closing valve body 23 is also the same as the rotary shaft 24 by the support portion 28 provided on the rotary shaft 24. By moving in the Z-axis direction and in close contact with the main body 19, it is possible to prevent water leakage at locations where the hot water storage tank lower flow path 21 and the hot water storage tank upper flow path 22 are not communicated with the through hole 29 of the closing valve body 23.

  FIG. 7 shows a cross section of the flow path switching valve 11 in a state where excessive pressure is generated in the pipe connected to the outflow port (21, 22) side of the flow path switching valve 11.

  When the supply of hot water to the hot water tank 1 is completed, the hot water tank upper flow path 22 is closed by the closing valve body 23. Therefore, when the pressure in the hot water tank upper return pipe 12 rises due to freezing or the like, the closing valve body 23 Moves below the flow path switching valve 11 to generate a gap 32.

  As a result, the outflow port (hot water tank upper flow path 22) closed at that time is opened and the plurality of outflow ports (21, 22) communicate with each other, so that the pressure increase in the hot water tank upper return pipe 12 is eliminated. Thus, the flow path switching valve 11 can be prevented from being damaged.

  Further, when hot water is drawn out from the hot water tank 1 so that the hot water supply device is not used for a long period of time, the internal pressure of the flow path switching valve 11 (particularly, the internal pressure on the inflow port 20 side) becomes approximately the same as the atmospheric pressure. Since the pressure difference between the internal pressure on the 20 side and the internal pressure on the outflow port (21, 22) side increases, the valve closing function of the rotary closing valve body 23 that has closed the hot water tank upper flow path 22 decreases, or To lose.

  Therefore, the hot water in the hot water tank return pipe 12 passes through the shut-off valve body 23 and the heat pump return pipe 9 and is discharged outside the hot water supply device. Breakage of the switching valve 11 can be prevented.

  Since the rotary shaft 24 receives a differential pressure between the internal pressure of the main body 19 and the external atmospheric pressure (atmospheric pressure), it is necessary to select a hard material (for example, PPS) that can withstand the pressure, and the closing valve body 23 and the rotary shaft 24 are integrated. If it comprises, the closing valve body 23 will also become a hard material.

  If the closing valve body 23 is made of a hard material as described above, the closing function is inferior, and therefore leakage to the blocked flow path occurs.

  When leakage occurs as described above, when the flow path of the flow path switching valve 11 is set from the inflow port 20 to the hot water tank lower flow path 21, it is low-temperature water that flows in from the heat pump heat source 2, and the hot water tank When the low-temperature water flows into the upper part, the hot water temperature in the upper part of the hot water storage tank 1 is lowered, and the total amount of heat that can be used is reduced, so that the thermal efficiency is lowered.

  By configuring the closing valve body 23 and the rotating shaft 24 as separate parts as in the present invention, the rotating shaft 24 uses a hard material (for example, PPS) with emphasis on strength, and the closing valve body 23 has a closing performance. It is possible to use a soft material (for example, PTFE) with emphasis on importance, and it is possible to provide a highly efficient hot water heater by preventing leakage of the valve body.

  Further, since the closing valve body 23 and the rotating shaft 24 are separate parts, when the closing valve body is made of resin or rubber material, the parting line generated on the split surface of the mold is not the upper surface of the closing valve body 23, As shown in FIG. 3, since it occurs on the side surface of the closing valve body, the surface roughness of the upper surface of the closing valve body 23 which is a closing surface is improved, and the closing performance is improved.

  According to the present invention, it is possible to realize a flow path switching valve with excellent closing performance, so that the present invention can be applied to water heaters for business use and household use.

1 Hot water tank 2 Heat pump heat source (heating means)
DESCRIPTION OF SYMBOLS 3 Water supply pipe 4 Pressure reducing valve 5 Hot water supply mixing valve 6 Boiling pump 7 Heat pump forward pipe 8 Compressor 9 Heat pump return pipe 10 Hot water tank lower return pipe 11 Flow path switching valve 12 Hot water tank upper return pipe 13 Incoming water temperature sensor 14 Hot water temperature sensor 15 Control board 16 Hot water supply temperature sensor 17 Flow rate sensor 18 Faucet 19 Main body 20 Inflow port (heat pump return flow path)
21 1st outflow port (hot water tank lower flow path)
22 2nd outflow port (hot water tank upper flow path)
23 Closing valve body 24 Rotating shaft 25 Rotating stop 26 Drive part 27 O-ring 28 Support part 29 Through hole 30 Notch 31 Projection 32 Gap

Claims (2)

Formed from the body and to have a transmembrane hole for communicating with at least one of said inlet ports and said plurality of outlet ports by rotating, a resin material or rubber material having at least one inlet port, a plurality of outlet ports The closed valve body and the closed valve body are separate parts, and the rotary valve is made of a material harder than the closed valve body by rotating the closed valve body, and formed at the lower part of the rotary shaft. The closing valve body includes a support portion that supports a lower surface of the closing valve body and is larger than an outer diameter of the rotating shaft, and a driving portion that rotates the rotating shaft, and the closing valve body and the rotating shaft are It is fitted to rotate at the same time, and the rotation shaft moves in a predetermined direction by the action of the internal pressure of the main body on the support portion , whereby the closing valve body is also moved by the support portion. Same direction of rotation axis movement Go to, among the plurality of outlet ports, the upper surface of the closure valve body, the flow path switching, characterized in that the arrangement for closing the outlet port that is not through the through hole and communicating said shutoff valve body valve. A hot water storage tank for storing hot water and water, a water supply pipe for supplying water to the hot water storage tank, a pressure reducing valve provided in the water supply pipe, and a heating means for heating the hot water. 2. A hot water supply apparatus, wherein the flow path switching valve according to claim 1 is used to switch between returning to the upper part of the hot water tank or returning to the lower part of the hot water tank via a heating means. .

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