JP5945714B2 - Heat pump water heater - Google Patents

Description

  The present invention relates to a heat pump water heater.

  Conventionally, this type of hot water supply device is configured to heat low temperature water in a hot water tank by heating means to make high temperature water, store the high temperature water in the same hot water tank, and mix it in the water circuit with 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. 3 shows a conventional hot water supply apparatus described in Patent Document 1. As shown in FIG. As shown in FIG. 3, the hot water tank 1, the heating means 2 (electric heater), the heat exchanger 20, the heat utilization terminal 23 (tub), the heat utilization hot water discharge pipe 21, the heat utilization return pipe 22, and the water supply pipe 5 are configured. Yes.

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. 4 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. When it increases 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 problem, the heat pump water heater of the present invention is a heat pump water heater in which water in a lower part of a hot water tank is heated by a heat pump device, returned to the upper part of the hot water tank, and hot water is stored. A heat-utilizing hot water discharge pipe for guiding the hot water in the upper part of the hot water storage tank to a heat exchanger; and a heat-utilizing return pipe for guiding the hot water heat-exchanged in the heat exchanger to an ejection water flow adjusting means. Hot water from the outlet of the water flow adjusting means is in the vicinity of the inner wall of the hot water storage tank, substantially in the horizontal direction with respect to the vertical direction of the hot water storage tank, and substantially perpendicular to the water flow direction in the pipe of the heat return pipe. It is characterized in that it is configured to flow into the hot water storage tank only from both sides .

  This makes it possible to reduce the amount of agitation in the hot water tank due to hot water flowing into the hot water tank via the heat utilization return pipe, and thus suppress an increase in the amount of medium-temperature water generated due to an increase in the amount of agitation. be able to.

  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.

(A) Transverse view of hot water storage tank of hot water supply apparatus in Embodiment 1 of the present invention (b) Vertical cross sectional view of hot water storage tank of hot water supply apparatus in Embodiment 1 of the present invention (A) Configuration diagram of ejection port of ejection water flow adjusting means in the hot water supply device (b) Configuration diagram of ejection port of other ejection water flow adjusting means (c) Ejection of other ejection water flow adjusting means Block diagram Sectional view of a conventional water heater (A) Transverse view of a hot water storage tank of a conventional hot water supply apparatus (b) Vertical cross sectional view of a hot water storage tank of a conventional hot water supply apparatus

1st invention is the heat pump water heater with which the water of the lower part of a hot water storage tank is heated with a heat pump apparatus, is returned again to the upper part of the said hot water storage tank, and the hot water of the upper part of the said hot water storage tank is used as a heat exchanger. A heat-utilizing hot water pipe that leads and a heat-utilizing return pipe that guides hot water heat-exchanged by the heat exchanger to the jet water flow adjusting means, and hot water from the outlet of the jet water flow adjusting means is: In the vicinity of the inner wall of the hot water tank, the hot water tank flows into the hot water tank only from both sides in a direction substantially horizontal to the vertical direction of the hot water tank and in a direction substantially perpendicular to the water flow direction in the heat return pipe. It is the heat pump water heater characterized by having performed.

  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 efficiency during 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 second aspect of the present 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 third 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 embodiment of the present invention and a state of a water flow jetted from the jet water flow adjusting means 40 into the hot water tank 1.

  In FIG. 1, 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 3. 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 supply apparatus 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 increased, 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 the present 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. 2 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. In addition, it can be applied to heat pump water heaters for business use.

1 Hot water tank 2 Heating means (heat pump device)
DESCRIPTION OF SYMBOLS 3 Boiling pipe 20 Heat exchanger 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 (3)

In a heat pump water heater in which water in the lower part of the hot water tank is heated by a heat pump device and is returned again to the upper part of the hot water tank, and stored in the heat pump hot water supply pipe, And a heat utilization return pipe for guiding the hot water exchanged by the heat exchanger to the jet water flow adjusting means, and the hot water from the outlet of the jet water flow adjusting means is near the inner wall of the hot water tank Thus, the hot water storage tank is configured to flow into the hot water storage tank from only both sides in a substantially horizontal direction with respect to the vertical direction of the hot water storage tank and in a direction substantially perpendicular to the water flow direction in the heat return pipe. Heat pump water heater. 2. 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 claim 1 or 2, wherein a flow path resistor is provided at an ejection port of the ejection water flow adjusting means.

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