JP2013160426A - Heat pump water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat pump water heater having superior energy saving properties which suppresses not only the decrease in an available amount of hot water due to the generation of intermediate temperature water but also the deterioration in the efficiency during heating.SOLUTION: The heat pump water heater includes a first hot-water feeding pipe 3 connected to an upper part of the hot-water storage tank 1, a water supply pipe 5 connected to a lower part of the hot-water storage tank, a second hot-water feeding pipe 4 connected between a position where the first hot-water feeding pipe 3 is connected and a position where the water supply pipe 5 is connected in the vertical direction of the hot-water storage tank, a heat utilization hot-water feeding pipe 21 for guiding the hot-water at the upper part of the hot-water storage tank 1 to a heat exchanger 20, and a heat utilization return pipe 22 for guiding the hot-water heat exchanged at the heat exchanger 20 to a jetting water flow adjusting means 40. The jetting water flow adjusting means 40 is connected to a position substantially at the same height as the connecting position of the second hot-water feeding pipe 4 of the hot-water storage tank 1 or to a position higher than that.

Description

  The present invention relates to a heat pump water heater.

  Conventionally, this type of hot water heater uses hot means to heat the low temperature water in the hot water tank into high temperature water, stores the high temperature water in the same hot water tank, and mixes it in the water circuit with the low temperature water. The temperature 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. 4 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. 5 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 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, a first hot water pipe connected to an upper part of the hot water storage tank, A water supply pipe connected to the lower part of the hot water storage tank, and a second hot water supply connected between a position where the first hot water discharge pipe is connected and a position where the water supply pipe is connected in the vertical direction of the hot water storage tank A heat utilization hot water discharge pipe for guiding the hot water in the upper part of the hot water storage tank to the heat exchanger, and a heat utilization return pipe for guiding the hot water heat-exchanged in the heat exchanger to the jet water flow adjusting means, The squirting water flow adjusting means is connected to the hot water storage tank at a position substantially the same as or higher than the connection position of the second hot water discharge pipe.

  As a result, the amount of intermediate temperature water generated by the water flow flowing in from the heat return pipe is suppressed by the jet water flow adjusting means, and the generated intermediate temperature water can be preferentially used by the second outlet 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 device can be reduced, a more efficient heat pump water heater can be provided.

  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 middle temperature water increasing, and the efficiency fall at the time of boiling operation.

Configuration diagram of a water heater in Embodiment 1 of the present invention (A) Cross-sectional view of a hot water storage tank of a water heater in Embodiment 2 of the present invention (b) Vertical sectional view of a hot water storage tank of a water heater in Embodiment 2 of the present invention (A) Configuration diagram of ejection port of ejection water flow adjusting means in the water heater (b) Configuration diagram of ejection port of other ejection water flow adjusting means (c) Ejection of other ejection water flow regulating means Block diagram 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

  1st invention, the hot water storage tank which stores the hot water heated with the heat pump apparatus, The 1st hot water pipe connected to the upper part of the said hot water storage tank, The water supply pipe connected to the lower part of the said hot water storage tank, Heating the second hot water pipe connected between the position where the first hot water pipe is connected and the position where the water pipe is connected in the vertical direction of the hot water tank, and the hot water at the top of the hot water tank A heat utilization hot water pipe led to the exchanger, and a heat utilization return pipe for guiding the hot water exchanged in the heat exchanger to the jet water flow adjusting means, wherein the jet water flow adjusting means is provided in the hot water storage tank. The heat pump water heater is connected to a position substantially equal to or higher than a connection position of the second hot water discharge pipe.

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.

  The second invention is characterized in that the water flow from the jet outlet of the jet water flow adjusting means is dispersed and jetted in a substantially horizontal direction with respect to the height direction in the hot water storage tank. It is a heat pump water heater.

  Thereby, the amount of stirring generated by the jet water flow flowing into the hot water storage tank from the heat utilization return pipe can be reduced, and the amount of medium-temperature water generated depending on the magnitude of stirring by the jet water flow can be suppressed.

  Therefore, it is possible to prevent a decrease in the amount of available hot water due to an increase in the amount of medium-temperature water and a decrease in the efficiency of the heating operation of the heat pump device, and it is possible to provide a heat pump water heater that realizes high convenience and energy saving.

  A third invention is a heat pump water heater characterized in that an area of an ejection port of the ejection water flow adjusting means is larger than an area of a water channel of the heat utilization return pipe.

  As a result, the jet flow velocity of the water flow ejected from the jet outlet can be made smaller than the flow velocity of the water flow flowing in the heat return pipe, and the amount of stirring by the jet water flow in the hot water tank can be further reduced. Therefore, the production amount of intermediate temperature water can be further suppressed.

  A fourth invention is a heat pump water heater, characterized in that a flow path resistor is provided at an ejection port of the ejection water flow adjusting means.

  As a result, it is possible to more divide the flow of the jet water flow by the net, which is a flow path resistor, and to disperse it uniformly and to increase the total surface area of the flux. The frictional force due to the viscosity of the water generated at the boundary surface between the water flowing from the outlet and the hot water in the hot water tank increases.

  As a result, the inertial force of the jetted water flow is more easily attenuated, the collision energy between the inner wall of the hot water tank and the water flow can be reduced, and the amount of stirring generated by the collision can be further greatly reduced.

  In addition, there is an effect of preventing entry of foreign matter into the hot water storage tank, and an effect of eliminating adverse effects on pumps and motor-operated valves configured in the water circuit can also be expected.

  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 supplied to the hot water supply port 11.

  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 heat pump water heater in Embodiment 2 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 the hot water in the hot water tank 1 is boiled up, 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. And 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 performing a bath reheating operation or a floor heating operation in which heat is transferred by a heat use terminal 23 such as a bath or floor heating, the hot water in the upper part of the hot water tank 1 is exchanged via a heat use hot water discharge pipe 21. 20, heat exchange is performed in the heat exchanger 20, and the heat supply return pipe 22, from a jet water flow adjusting means 40, which will be described later, in the height direction of the hot water storage tank 1, in the vicinity of the substantially central portion or the heat utilization hot water It is set as the structure returned between the pipe | tube 21 and the approximate center part.

  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.

  The two outlets 41 a and 41 b formed in the jet water flow adjusting means 40 are provided in the vicinity of the inner wall in the hot water tank 1, are horizontal with respect to the vertical direction of the hot water tank 1, and the heat utilization return pipe 22. Are formed on both sides so as to be substantially perpendicular to the water flow in the pipe.

  Further, the opening areas of the two outlets 41a and 41b are substantially the same, and the total area is about 2 to 3 times the flow area of the heat return pipe 22.

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

  Hot water flowing into the jet water flow adjusting means 40 through the heat utilization return pipe 22 flows into the hot water storage tank 1 from the jet ports 41 a and 41 b formed in the jet water flow adjusting means 40.

  The plurality of outlets 41a and 41b formed in the jet water flow adjusting means 40 are arranged on both sides so as to be substantially perpendicular to the pipe internal water flow in the heat utilization return pipe 22 at a position near the inner wall in the hot water tank 1. And is formed so as to be substantially horizontal with respect to the vertical direction of the hot water tank 1.

  Therefore, the water flow that flows into the hot water tank 1 from the ejection ports 41a and 41b flows substantially horizontally with respect to the vertical direction of the hot water tank 1, and is substantially perpendicular to the in-pipe water flow direction of the heat utilization return pipe 22. Into the left and right sides.

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 have substantially the same opening area, and the total area is about 2 to 3 times the water channel area of the heat return pipe 22, so that the jet of water flowing from the outlets 41a and 41b is discharged. The flow rate 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 becomes ¼ and the amount of stirring becomes 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 collides from the front after traveling half the circumference of the inner wall of the hot water tank 1, but collides by setting the jet flow velocity to 1/2 to 1/3. When the energy is set to 1/4 to 1/9 and the travel distance is increased by (π / 2) times, the collision energy at the time of collision becomes extremely small. Therefore, the amount of stirring caused by the collision can be effectively 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 of the temperature distribution in the hot water tank.

  As described above, in the present embodiment, a plurality of jet water flows from the jet ports 41a and 41b are dispersed in a substantially horizontal direction, and the jet water flow in which the jet flow area is reduced by increasing the area of the jet ports. A heat pump water heater provided with the adjusting means 40 was used.

  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 during the heating operation of the heat pump device, and it is possible to provide a heat pump water heater excellent in convenience and energy saving.

  FIG. 3 is a configuration diagram of the ejection ports 41 a and 41 b of the ejection water flow adjusting means 40. (A) configures the ejection port as a long hole. (B) is configured such that the ejection port is formed into a plurality of small hole shapes. (C) is one in which a net is formed at the outlet.

  In either case, by increasing the area of the ejection ports 41a and 41b, the ejection flow velocity is decreased, and the flux is divided and dispersed.

  Further, in the configuration diagram of (c), by arranging the mesh 42 as a flow path resistor at the outlet, there is an effect of preventing the entry of foreign matter into the hot water storage tank 1, and the water circuit is configured. In addition, it can be expected to have an effect of eliminating adverse effects on the pump and the motor-operated valve.

  These diagrams all aim to attenuate the collision energy of the water flow more effectively by reducing the jet flow velocity, increasing the surface area of the flux and increasing the viscous friction with the surrounding water. Although it controls the flow velocity and direction of the water jet, it is not limited to this configuration and shape.

  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 port 41b Ejection port 42 Net | network (flow-path resistor)
50 stirring area

Claims (4)

A hot water storage tank for storing hot water heated by a heat pump device, a first hot water pipe connected to the upper part of the hot water storage tank, a water supply pipe connected to the lower part of the hot water storage tank, and the vertical direction of the hot water storage tank The second hot water pipe connected between the position where the first hot water pipe is connected and the position where the water supply pipe is connected, and heat utilization for leading the hot water in the upper part of the hot water storage tank to the heat exchanger A hot water return pipe that guides the hot water heat-exchanged by the heat exchanger to the spout water flow adjusting means, and the spout water flow adjusting means includes the second hot water of the hot water storage tank. A heat pump water heater characterized by being connected to a position substantially the same height as the connection position of the pipe or a position higher than that. 2. The structure according to claim 1, wherein the water flow from the ejection port of the ejection water flow adjusting means is configured to be dispersed and ejected in a substantially horizontal direction with respect to a height direction in the hot water storage tank. Heat pump water heater. 3. The heat pump water heater according to claim 1, wherein an area of an ejection port of the ejection water flow adjusting means is larger than an area of a water channel of the heat utilization return pipe. The heat pump water heater according to any one of claims 1 to 3, wherein a flow path resistor is provided at an ejection port of the ejection water flow adjusting means.

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