JP2013181710A - Heat pump water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat pump water heater that is superior in energy saving property by suppressing a decrease in an amount of usable hot water caused by an increase in a generation amount of hot water, and a decrease in efficiency during a heating operation.SOLUTION: A heat pump water heater includes: a hot water storage tank 1 for storing hot water heated by a heat pump device 2; a heat using hot water feeding pipe 21 for guiding hot water in an upper part of the hot water storage tank 1 to a heat exchanger 20; and a heat using return pipe 22 for guiding the hot water heat-exchanged in the heat exchanger 20 to a jet water flow adjustment means 40. The jet water flow adjustment means 40 jets water flow from jet ports to be dispersed in a substantially horizontal direction relative to a height direction in the hot water storage tank 1, and a plurality of the jet ports (41a, 41b, 43a, and 43b) is provided in the jet water flow adjustment means 40.

Description

  The present invention relates to a heat pump water heater.

  Conventional hot water heaters heat the low-temperature water in the hot water tank by heating means to form high-temperature water, store the high-temperature water in the same hot water tank, and mix it in the water circuit with the low-temperature water to reach the target temperature. It is controlled and supplied to the heat utilization terminal.

  Moreover, what has the circuit which heats the low-temperature water in a hot water storage tank using the heat of a heat | fever utilization terminal (for example, bathtub) and stores hot water in a hot water storage tank is also considered (for example, refer patent document 1).

  FIG. 5 shows a conventional water heater described in Patent Document 1. As shown in FIG. As shown in FIG. 4, it is composed of a hot water tank 1, a heating means 2 (electric heater), a heat exchanger 20, a heat utilization terminal 23 (tub), a heat utilization hot water discharge pipe 21, a heat utilization return pipe 22, and a water supply pipe 5. ing.

Japanese Patent Laid-Open No. 2003-269991

  However, in the conventional configuration, the heat utilization return pipe 22 is directly connected to the side surface of the hot water tank 1 so that hot water flowing in the heat utilization return pipe 22 is ejected into the hot water tank 1 from the outlet of the heat utilization return pipe 22. Therefore, the amount of hot water in the hot water storage tank 1 by the jetted water flow is increased, and the amount of medium-temperature water generated due to the size of the stirring is increased.

  There is no problem if the heating means 2 is an electric heater, but in the case of a heat pump device, the incoming water temperature during the boiling operation rises, leading to deterioration of the efficiency of the heat pump device.

  FIG. 6 shows the state of stirring in the hot water tank 1 by the water flow ejected from the heat utilization return pipe 22 in the prior art.

  The flux of the water flow ejected from the outlet of the heat utilization return pipe 22 becomes one circular shape, the size of which is determined by the inner diameter of the outlet of the heat utilization return pipe 22, and the water flow rate is the outlet area and the flow rate of water passing therethrough. It depends on. The water flow rate is determined by the heating capacity of the heat exchanger 20, and the pipe diameter of the heat utilization return pipe 22 must be maintained so that the pressure loss caused by the heat utilization return pipe 22 does not adversely affect the pump input. .

  Under these conditions, the water flow that is conventionally jetted from the outlet of the heat return pipe 22 into the hot water tank 1 is in a jet state, and rushes through the hot water tank 1 and collides with the opposing inner wall of the hot water tank 1 as shown in FIG. .

  Due to the collision, the water flow is largely reflected in the vertical and horizontal directions of the hot water tank 1, thereby increasing the amount of stirring and increasing the amount of intermediate temperature water generated.

When the heating means 2 is a heat pump device, water is circulated from the bottom of the hot water tank 1 to the heating means 2 installed in the heat pump device in order to perform the night boiling operation. If the amount is more than necessary, the amount of medium-temperature water sent to the heating means 2 increases and the efficiency decreases.

  The present invention solves the above-described conventional problems, and suppresses a decrease in the amount of hot water that can be used due to an increase in the amount of intermediate-temperature water generated and a decrease in efficiency during boiling operation, and is an energy-saving heat pump hot water supply The purpose is to provide a machine.

  In order to solve the above-described conventional problems, a heat pump water heater of the present invention includes a hot water storage tank for storing hot water heated by a heat pump device, and a heat-utilizing hot water discharge pipe for leading the hot water in the upper part of the hot water storage tank to a heat exchanger And a heat utilization return pipe that guides the hot water heat-exchanged by the heat exchanger to the jet water flow adjusting means, and the water flow from the outlet of the jet water flow adjusting means is within the hot water storage tank. In addition to being configured to eject in a substantially horizontal direction with respect to the height direction, a plurality of the ejection ports are disposed in the ejection water flow adjusting means.

  Thereby, even when any of the outlets is clogged, it is possible to prevent a decrease in the circulation amount of hot water passing through the heat exchanger, thereby preventing a decrease in the heat exchange function in the heat exchanger. .

  ADVANTAGE OF THE INVENTION According to this invention, the heat pump water heater excellent in energy saving property can be provided by suppressing the reduction | decrease in the amount of hot water available by the generation amount of warm water increasing, and the efficiency fall at the time of boiling operation.

Configuration diagram of heat pump water heater in Embodiment 1 of the present invention (A) Transverse view of hot water storage tank of heat pump water heater in Embodiment 1 of the present invention (b) Vertical cross sectional view of hot water storage tank of heat pump water heater in Embodiment 1 of the present invention (A) Front view of spout water flow adjusting means in the heat pump water heater (b) Top view of spout water flow adjusting means in the heat pump water heater Top view of other jet water flow adjusting means in the heat pump water heater Cross section of a conventional water heater (A) Cross-sectional view of a hot water storage tank of a conventional water heater (b) Vertical cross-sectional view of a hot water storage tank of a conventional water heater

  In the first aspect of the invention, a hot water storage tank for storing hot water heated by a heat pump device, a heat-utilizing hot water discharge pipe for leading the hot water in the upper part of the hot water storage tank to the heat exchanger, and heat exchange by the heat exchanger are performed. And a heat utilization return pipe for guiding the hot water to the jet water flow adjusting means, and the water flow from the outlet of the jet water flow adjusting means is dispersed in a substantially horizontal direction with respect to the height direction in the hot water storage tank. The heat pump water heater is characterized in that a plurality of the ejection openings are arranged in the ejection water flow adjusting means.

  Thereby, even when any of the outlets is clogged, it is possible to prevent a decrease in the circulation amount of hot water passing through the heat exchanger, thereby preventing a decrease in the heat exchange function in the heat exchanger. .

In a second aspect of the present invention, the first hot water pipe connected to the upper part of the hot water tank, the water supply pipe connected to the lower part of the hot water tank, and the first hot water pipe connected in the vertical direction of the hot water tank. And a second hot water discharge pipe connected between the position where the water supply pipe is connected, and the spout water flow adjusting means is connected to the second hot water discharge pipe in the hot water storage tank. It is characterized by being connected to a position of approximately the same height as or higher than that.

  As a result, the amount of medium-temperature water generated by the water flow flowing in from the heat utilization return pipe is suppressed by the jet water flow adjusting means, and the generated medium-temperature water can be preferentially used by the second hot water discharge pipe, Since the adverse effect on the temperature distribution in the hot water tank can be suppressed and the influence on the incoming water temperature during the boiling operation of the heat pump apparatus can be reduced, a more efficient heat pump water heater can be provided.

  According to a third aspect of the present invention, a flow path resistor is provided at the ejection port.

  As a result, the uniform water flow discharged from the ejection port provided with the flow path resistor is less affected by the water flow ejected from the other ejection ports, and a uniform flow velocity distribution can be maintained. Therefore, it becomes possible to reduce the amount of stirring by the jet water flow in a hot water tank, and to suppress the production amount of intermediate temperature water.

  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 diagram showing a configuration of a hot water storage type heat pump water heater in the first embodiment of the present invention.

  In FIG. 1, a heat pump water heater includes a hot water tank 1, a heat pump device 2 that is a heating means for heating the water in the hot water tank 1, a first hot water pipe 3 connected to the upper part of the hot water tank 1, and hot water storage. Between the water supply pipe 5 connected to the lower part of the tank 1, the position where the first hot water discharge pipe 3 and the water supply pipe 5 are connected, that is, in the height direction, connected to the substantially central part of the trunk of the hot water storage tank 1. And a first mixing valve 6 having a first hot water pipe 3 and a second hot water pipe 4 connected to the inlet side. The second mixing valve 7 connected to the outlet side of the first mixing valve 6 and the feed water junction pipe 8 and the feed water branch pipe 10 connected to the inlet side, and the outlet of the second mixing valve 7 It is comprised from the mixed water pipe 9 connected to the side.

  Furthermore, in the height direction of the hot water storage tank 1, the heat utilization hot water pipe 21 connected to the upper part of the hot water storage tank 1, the heat exchanger 20 connected to the heat utilization hot water discharge pipe 21, and the first in the upper part of the hot water storage tank 1. The spout water flow adjusting means 40 connected between the position where the hot water discharge pipe 3 and the heat utilization hot water discharge pipe 21 are connected to the hot water storage tank 1 and the position where the second hot water discharge pipe 4 is connected to the hot water storage tank 1. And.

  About the hot water heater comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  As a basic operation, the hot water tank 1 is filled with low-temperature water before the boiling operation, and when the operation is started, the water in the hot water tank 1 is sent to the heat pump device 2 through the boiling pipe 16 and there. The hot water is heated and returned to the hot water tank 1, and the hot water is stored in the hot water tank 1.

  The temperature distribution of the hot water in the hot water tank 1 is distributed in the vertical direction so that high temperature hot water is stored in the upper part of the hot water tank 1 depending on the density of the hot water, and the temperature gradually decreases in the lower direction.

When using hot water after the boiling operation, the hot water in the hot water storage tank 1 discharged through the first hot water pipe 3 and the second hot water pipe 4 is mixed with the hot water pipe combined by the first mixing valve 6. The hot water in 8 and the water supplied from the water supply branch pipe 10 are mixed by the second mixing valve 7 to the hot water supply set temperature, and the hot water inlet 1
1 is supplied.

  Further, water corresponding to the amount of hot water used for hot water supply flows from the lower part of the hot water tank 1 through the water supply pipe 5. When using the heat utilization terminal 23, hot water from the hot water storage tank 1 is sent to the heat exchanger 20 through the heat utilization outlet pipe 21, and the medium temperature water after heat exchange with the circulation circuit of the heat utilization terminal 23 is performed. The purpose is to reduce the collision energy of the water flow through the heat return pipe 22 by the jet water flow adjusting means 40, the jet flow velocity is reduced, the flow direction is controlled while being dispersed, and into the hot water tank 1. Inflow.

  The temperature of the hot water in the hot water storage tank 1 at the inflow position is often higher than the temperature of the medium temperature water after heat exchange, and therefore the hot water below the position where the jet water flow adjusting means 40 is connected is medium. There are many cases of hot water.

  After that, when hot water is generated, the second hot water discharge pipe 4 is connected to a position below the jet water flow adjusting means 40, so that the medium hot water jetted by the jet water flow adjusting means 40 is preferentially used. It is possible to efficiently remove the influence on the temperature distribution due to the medium-temperature water ejected from the ejected water flow adjusting means 40.

  Moreover, since the spout water flow adjustment means 40 is connected to the upper part of the hot water tank 1, the distance to the water supply temperature zone at the lower part of the hot water tank 1 is increased, thereby reducing the degree of influence on the temperature of the hot water tank. Moreover, the efficiency fall by the quantity of the middle temperature water at the time of the boiling operation of the heat pump apparatus 2 increasing can be reduced.

  As described above, according to the present embodiment, the connection position of the spout water flow adjusting means 40 with the hot water storage tank 1 is set higher than the connection position of the second hot water pipe 4 with the hot water storage tank 1. The amount of medium temperature water generated by the water flow flowing in from the heat utilization return pipe 22 is suppressed by the jet water flow adjusting means 40, and the generated medium temperature water can be preferentially used by the second hot water discharge pipe. It is possible to prevent a decrease in efficiency during the boiling operation of the apparatus. Therefore, it can be set as the hot water storage type heat pump water heater which implement | achieved high energy saving property.

  In the present invention, the connection position of the spout water flow adjusting means 40 is higher than the connection position of the second hot water discharge pipe 4, but if it is in the vicinity even below the connection position of the second hot water discharge pipe 4, it is almost the same. Similar effects can be obtained.

(Embodiment 2)
FIG. 2 is a diagram showing the configuration of the hot water storage type hot water heater in the embodiment of the present invention and the state of the water flow jetted from the jet water flow adjusting means 40 into the hot water tank 1.

  In FIG. 2, when boiling hot water in the hot water tank 1, the water in the lower part of the hot water tank 1 is heated by the heat pump device 2, and returned to the upper part of the hot water tank 1 again by the boiling pipe 16. Hot water is stored. Due to this configuration, the temperature of water entering the heat pump device 2 rises and the enthalpy difference on the high pressure side becomes small just before the end of the boiling operation, etc., so the operating efficiency of the heat pump device 2 tends to decrease.

  In addition, when heat is transferred from the heat utilization terminal 23 such as a bath or floor heating, the hot water in the upper part of the hot water tank 1 is guided to the heat exchanger 20 via the heat utilization hot water discharge pipe 21, and the heat exchanger 20. In the height direction of the hot water storage tank 1, the heat exchange tank 40, which will be described later, through the heat use return pipe 22, in the height direction of the hot water storage tank 1, or between the heat use hot water discharge pipe 21 and the substantially center part. It is configured to return.

Then, the heat exchanged by the heat exchanger 20 is transmitted to the heat utilization terminal 23 by the heat utilization circuit 17.

  Further, the jet water flow adjusting means 40 is connected to a return port 1 b provided on the side surface of the hot water tank 1, and the heat utilization return pipe 22 is connected to the jet water flow adjusting means 40.

  FIG. 3 is a configuration diagram of the ejection port arranged in the ejection water flow adjusting means 40 in the embodiment of the present invention.

  The ejection ports 41 a and 41 b provided with two flow path resistors (nets 42) formed in the ejection water flow adjusting means 40 are provided at positions near the inner wall in the hot water tank 1, and the vertical direction of the hot water tank 1. Are formed on both sides so as to be horizontal and substantially perpendicular to the water flow in the heat return pipe 22.

  Further, the second outlets 43a and 43b formed in the outlet water flow adjusting means 40 are arranged at positions downstream of the outlets 41a and 41b provided with the flow path resistors in the pipe water flow direction. It is formed on both sides so as to be horizontal with respect to the vertical direction of the hot water tank 1 and substantially perpendicular to the water flow in the heat return pipe 22.

  Further, the outlets 41a and 41b and the second outlets 43a and 43b provided with the flow path resistors have substantially the same opening area, and the total opening area of the four outlets is the heat return pipe 22. About 2 to 3 times the flow path area.

  The total opening area of the second ejection ports 43a and 43b is about 1/5 of the total opening area of the four ejection ports.

  About the hot water supply apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  The hot water flowing into the ejection water flow adjusting means 40 through the heat return pipe 22 is ejected from the ejection ports 41a and 41b provided with the flow path resistors formed in the ejection water flow adjusting means 40, and the second ejection. It flows into the hot water tank 1 from the inlets 43a and 43b.

  The outlets 41a and 41b provided with the flow path resistors have a net 42 as the flow path resistance, and impurities derived from tap water adhere to the net 42 as the operation time increases. To go.

  If impurities or the like adhere and the flow path is completely blocked, hot water will not flow into the heat-utilizing hot water outlet pipe 21 and the heat-utilizing return pipe 22, and the hot water storage tank 1 and the heat-utilizing terminal 23 via the heat exchanger 20 The heat exchange function between them is lost.

  However, since the second outlets 43a and 43b do not have a flow path resistor like the net 42, the risk of clogging is extremely low. Therefore, the net 42 is clogged, and the flow path resistor Even if the ejection ports 41a and 41b provided with the above are completely blocked, the second ejection ports 43a and 43b are not easily blocked, and the possibility that the flow path is completely blocked is small.

  The larger the opening area of the second outlets 43a and 43b, the smaller the risk of clogging, but it becomes too large relative to the opening area of the outlets 41a and 41b provided with flow path resistors. Then, the flow rate of hot water discharged from the second ejection ports 43a and 43 is increased, and the flow rate passing through the mesh 42 is decreased. Therefore, the effect of dispersing the hot and cold water flux of the net 42 that is the flow path resistor is diminished.

  From the above, in the present embodiment, in the ejection water flow adjusting means 40, the total opening area of the second ejection ports 43a and 43b is set to about 1/5 of the total opening area of the four ejection ports. . The flow rate of the hot water discharged from the outlets 41a and 41b provided with the flow path resistor and the flow rate of the hot water discharged from the second outlets 43a and 43b are uniform, and the jet provided with the flow path resistor Even when the openings 41a and 41b are closed, a flow path can be secured through the second outlets 43a and 43b.

  This prevents loss of the heat exchange function between the hot water tank 1 and the heat utilization terminal 23 even when the outlets 41a and 41b provided with the flow path resistors are clogged, and the risk of failure. The hot water storage type water heater can be reduced.

  Further, the ejection ports 41a and 41b and the second ejection ports 43a and 43b provided with flow path resistors are substantially perpendicular to the water flow in the heat return pipe 22 at positions near the inner wall in the hot water tank 1. And are formed so as to have a substantially horizontal relationship with respect to the vertical direction of the hot water tank 1.

  Accordingly, the water flow flowing into the hot water tank 1 from the outlets 41a and 41b and the second outlets 43a and 43b provided with the flow path resistors flows substantially horizontally with respect to the vertical direction of the hot water tank 1. At the same time, the heat is returned to the both sides of the right and left direction in a direction substantially perpendicular to the water flow direction in the return pipe 22 and flows in.

  Since the collision angle with the inner wall can be made shallower by this inflow direction, the water flow proceeds in the circumferential direction substantially along the shape of the inner wall of the hot water tank 1. The travel distance until the two water streams collide is ½ of the circumference of the inner wall of the hot water tank 1, and the travel distance is longer than the inner wall diameter of the hot water tank 1, which is the travel distance of the prior art. The flow velocity of the water flow decreases as the traveling distance becomes longer due to viscous friction with surrounding water.

  Further, the outlets 41a and 41b and the second outlets 43a and 43b provided with the flow path resistors have substantially the same opening area, and the total area is about 2 to 2 of the water channel area of the heat utilization return pipe 22. Since it is three times, the jet flow velocity of the water flowing in from the jet ports 41a and 41b and the second jet ports 43a and 43b provided with the flow path resistors is reduced to about 1/2 to 1/3. The relationship between the collision energy of the water flow and the flow velocity is E = 1/2 mv2, and is proportional to the square of the flow velocity. Therefore, when the flow velocity is halved, the collision energy is ¼ and the amount of stirring is ¼.

  Thus, the larger the area of the ejection port with respect to the water channel area of the heat return return pipe 22, the smaller the ejection flow velocity from the ejection port. On the other hand, the larger the area of the ejection port, the larger the ejection area. The length of the water flow adjusting means 40 is increased, the relative position with the inner wall of the hot water storage tank 1 is changed, the collision angle with the inner wall is deepened, and the effect is reduced. Moreover, it leads to the cost increase of the ejection water flow adjustment means 40, and an assembly property also worsens.

  From the above, in this embodiment, it is about 2-3 times. The water flow dispersed at the outlets 41a and 41b and the second outlets 43a and 43b provided with the flow path resistors collides from the front after traveling half the circumference of the inner wall of the hot water tank 1. The collision energy at the time of collision by setting the jetting flow velocity to 1/2 to 1/3, the collision energy to 1/4 to 1/9, and the traveling distance by (π / 2) times is Remarkably smaller. Therefore, the amount of stirring caused by the collision can be effectively reduced.

  Further, the second outlets 43a and 43b are arranged on the downstream side of the heat return pipe 22 in the water flow direction with respect to the outlets 41a and 41b provided with the mesh 42 as the flow path resistor. .

  Since the second ejection ports 43a and 43b are not provided with flow path resistors to prevent clogging, the water flow flowing into the hot water storage tank from the second ejection ports 43a and 43b It inclines in the direction of flow a little rather than the direction perpendicular to the water flow direction of 22 pipes.

  In FIG. 4, the second outlets 43 a and 43 b are arranged upstream of the outlets 41 a and 41 b provided with the net 42 as the flow path resistor in the direction of water flow in the pipe of the heat return pipe 22. It is a block diagram of the ejection water flow adjustment means 40 in the case.

  In the case where the second ejection ports 43a and 43b are installed on the upstream side with respect to the direction of water flow in the heat return pipe 22, the water flow ejected from the second ejection ports 43a and 43b has a flow resistance. It interferes with the water flow ejected from the ejection ports 41a and 41b provided with the body, disturbs the uniform flow, and increases the amount of stirring.

  Therefore, in the present embodiment, the second outlets 43a and 43b are disposed downstream of the outlets 41a and 41b provided with the flow path resistors in the direction of water flow in the pipe of the heat return pipe 22. The amount of hot water in the hot water tank 1 was reduced.

  The temperature distribution of the hot water in the hot water tank 1 is distributed in the vertical direction of the hot water tank 1 due to the density difference. That is, when the stirring is increased in the vertical direction, the temperature distribution is disturbed. By reducing the amount of stirring in the vertical direction caused by the collision between the water flow, the inner wall of the hot water storage tank 1 and the water flow, the amount of intermediate-temperature water produced can be suppressed.

  Therefore, reducing the amount of stirring in the vertical direction leads to suppression of disturbance in the temperature distribution in the hot water tank.

  As described above, in the present embodiment, a plurality of water streams ejected from the ejection ports 41a and 41b and the second ejection ports 43a and 43b provided with the flow path resistors are dispersed in a substantially horizontal direction. The area of the inlet is increased to reduce the jet velocity, and the jet water flow from the second jet openings 43a and 43b becomes the jet water flow from the jet openings 41a and 41b provided with flow path resistors. It was set as the heat pump water heater provided with the jet water flow adjustment means 40 which was made not to interfere.

  Thereby, it is possible to suppress the disturbance of the temperature distribution of the hot water in the hot water tank. Therefore, it is possible to prevent a decrease in the amount of hot water available due to an increase in medium-temperature water and a decrease in efficiency at the time of boiling the heat pump device, and a heat pump water heater excellent in convenience and energy saving can be obtained.

  As described above, the heat pump water heater according to the present invention can prevent a decrease in the amount of hot water available due to an increase in the amount of medium-temperature water and a decrease in the boiling operation efficiency of the heat pump device. It can also be applied to heat pump water heaters for business use.

1 Hot water tank 2 Heating means (heat pump device)
DESCRIPTION OF SYMBOLS 3 1st hot-water pipe 4 2nd hot-water pipe 5 Water supply pipe 6 1st mixing valve 7 2nd mixing valve 8 Hot-water supply pipe merge pipe 9 Mixed water pipe 10 Water supply branch pipe 11 Hot water inlet 16 Boiling pipe 20 Heat exchanger DESCRIPTION OF SYMBOLS 21 Heat utilization hot water pipe 22 Heat utilization return pipe 23 Heat utilization terminal 40 Ejection water flow adjustment means 41a Ejection opening provided with flow path resistance 41b Ejection opening provided with flow resistance 42 Net (flow resistance)
43a Second outlet 43b Second outlet 50 Stirring area

Claims (3)

A hot water storage tank for storing hot water heated by a heat pump device, a heat-utilizing hot water discharge pipe that guides the hot water at the top of the hot water storage tank to the heat exchanger, and hot water that has been heat-exchanged by the heat exchanger A heat utilization return pipe leading to the adjusting means, and a structure in which the water flow from the outlet of the jet water flow adjusting means is dispersed in a substantially horizontal direction in the hot water storage tank and jetted. In addition, the heat pump water heater is characterized in that a plurality of the ejection ports are arranged in the ejection water flow adjusting means. A first hot water pipe connected to the upper part of the hot water tank; a water supply pipe connected to the lower part of the hot water tank; a position where the first hot water pipe is connected in the vertical direction of the hot water tank; A second hot water discharge pipe connected between the pipe and the position where the pipe is connected, and the spout water flow adjusting means has substantially the same height as the connection position of the second hot water discharge pipe of the hot water storage tank. The heat pump water heater according to claim 1, wherein the heat pump water heater is connected to a position or a position higher than the position. The heat pump water heater according to claim 1, wherein a flow path resistor is provided at the ejection port.

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