JPH03211361A - Heat-pump hot water supplier - Google Patents

Abstract

PURPOSE:To improve hot water supply efficiency, reduce equipment costs and avoid mechanical troubles by arranging a refrigerant piping, a refrigerant circuit and a hot water piping. CONSTITUTION:High-temperature and high-pressure refrigerant gas discharged out of a dis charge port of a compressor 1 is consensed and liquified by a condenser 2, expanded adiabatically by a throttle 3, vaporized and gasified by an evaporator 4 in the process of circulation through a refrigerant piping 25, and finally sucked into a suction port 13 of the compressor 1. Middle-temperature and middle-pressure refrigerant gas which is semi-compressed and discharged out of a middle discharge port 11 of the compressor 1 is condensed and liquified by a middle condenser 5, expanded adiabatically by a throttle means 6 in the process of flow through a refrigerant circuit 7, and finally joins with the refrigerant circulating through the refrigerant piping 25 at an inlet of the evaporator 4. Water to be supplied is first heated by heat exchanging by the middle-temperature and middle-pressure refrigerant gas discharged out of the middle discharge port 11 of the middle condenser 5, and then heated further by heat exchanging by the high-temperature and high-pressure refrigerant gas dis charged out of the discharge port 12 of the condenser 2. Thus the water to be supplied becomes very hot. This constitution is very effective in improving efficiency of hot water supply, reducing equipment costs and avoiding mechanical troubles.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a heat pump water heater.

(Prior art and its problems) An example of a conventional heat pump water heater is shown in FIG.

The refrigerant gas discharged from the compressor 8121 is condensed and liquefied by heating hot water in the condenser 22, adiabatically expanded in the expansion device 23, then evaporated in the T generator 24, and then returned to the compressor 21.

In order to obtain hot water in this heat pump water heater, the compression ratio in the compressor 21 must be increased.
When the compression ratio is increased, the compression efficiency decreases, resulting in a problem of low hot water supply performance.

Therefore, in order to deal with this problem, a human pump water heater shown in FIG. 5 was proposed.

The refrigerant gas discharged from the low stage compressor 31 is condensed and liquefied in the intermediate exchanger 32, adiabatically expanded in the expansion device 33, evaporated in the evaporator 34, and returned to the low stage compressor 31.

On the other hand, the refrigerant gas discharged from the high stage compressor 35 is condensed and liquefied in the condenser 36, adiabatically expanded in the expansion device 37, evaporated in the intermediate heat exchanger 32, and then returned to the high stage compressor 35.

After the hot water is preheated in the intermediate heat exchanger 32, it passes through the condenser 36.
When heated, it becomes hot water and is taken out.

This heat pump water heater has two compressors 31 and 3.
5, and the high-stage compressor 35 has a high suction pressure, so it needs to be specially designed, which increases the cost.

Means for Solving the Problems) The present invention was invented to solve the above problems, and its gist is that the refrigerant gas discharged from the discharge port of the compressor is refrigerant piping that circulates through the device and the evaporator in this order to the inlet of the pressure wi machine;
A refrigerant circuit in which the compressed refrigerant gas discharged from the intermediate discharge 11 of the pressure l1ii can passes through an intermediate condenser and a throttle means in this order and is connected to the inlet of the evaporator, and hot water is supplied to the intermediate condenser. and a heat pump type hot water supply system, characterized in that the hot water supply pipe is arranged to cause the hot water to flow through the condenser in this order.

(Function) The high-temperature, high-pressure refrigerant gas discharged from the discharge port of the compressor is condensed and liquefied in the condenser as it circulates through the refrigerant piping, adiabatically expanded in the expansion device, evaporated and vaporized in one generator, and then compressed. Inhaled into the machine's inlet.

During compression, the medium temperature and medium pressure refrigerant gas discharged from the intermediate discharge port of the compressor is condensed and liquefied in the intermediate condenser as it flows through the refrigerant circuit, adiabatically expanded by the throttling means, and then refrigerated at the inlet of the evaporator. It joins the refrigerant circulating in the piping.

Hot water is a medium-temperature water discharged from an intermediate outlet in an intermediate condenser.
After being preheated by exchanging heat with medium-pressure refrigerant gas, it is further heated by exchanging heat with high-temperature, high-pressure refrigerant gas discharged from the discharge port in the condenser, and becomes hot water.

Embodiment One embodiment of the invention is shown in FIGS. 1-3.

In FIG. 1, ■ is a compressor, which has an intermediate discharge port 11 for discharging refrigerant gas in the middle of compression, a discharge port 12 for discharging refrigerant gas after being completely compressed, and a suction port 13. have. The discharge port 12 of this compressor and the condenser 2
, the throttle device 3 , the evaporator 4 , and the suction port 13 of the compressor 1
and are connected in this order by refrigerant piping 25. The intermediate discharge port 11 of the compression Ill, the intermediate condenser 5, the throttle means 6, and the inlet of the evaporator 4 are connected in this order by a refrigerant circuit 7.

Reference numeral 8 denotes a hot water supply pipe that allows hot water to flow through the intermediate condenser 5 and the condenser 2 in this order.

Figure 2 shows details of the pressure w3 machine.

A rotor 15 is disposed eccentrically within the cylinder 14 , and the rotor 15 is driven by a drive shaft 16 to eccentrically rotate in the direction of the arrow, so that its outer circumferential surface slides against the inner circumferential surface of the cylinder 14 . Höhn 17 for cylinder 14
is supported so that it can appear and retract freely, and this hee 717 is supported by the spring 1
It moves forward by being pushed and pushed by the sun, and its tip comes into sliding contact with the outer peripheral surface of the rotor 15.

The cylinder 14 is provided with an inlet 13 on the rotational direction side adjacent to the hone 17, and a discharge port 12 is provided on the opposite side of the rotational direction. An intermediate discharge port 11 is disposed at. 19 is a discharge valve that opens and closes the discharge port 12, and 20 is an intermediate discharge valve that opens and closes the intermediate discharge port 11.

When the rotor 15 is rotated in the direction of the arrow, refrigerant gas is sucked into the suction chamber S from the suction port 13. When the rotor 15 passes through the suction port 13, the suction chamber S becomes a compression chamber C, and as the volume of the compression chamber C gradually decreases, the refrigerant gas in the compression chamber C is gradually compressed. When the pressure of the refrigerant gas rises to a predetermined intermediate pressure, the intermediate discharge valve 2
0 is pushed open and discharged from the intermediate discharge port 11. When the rotor 15 passes through the intermediate discharge port 11, the pressure of the refrigerant gas in the compression chamber C further increases, and when this pressure rises to a predetermined discharge pressure, the discharge valve 19 is pushed open and the refrigerant gas is discharged from the discharge port 12. .

FIG. 3 shows a Mollier diagram, in which the suction port 1 of the compressor 1
After being compressed by the compressor 1, the refrigerant gas in the state Ma drawn from the refrigerant gas 3 is discharged from the discharge port 12 in the state shown in FIG.
Next, the C state changes to the d state by adiabatic expansion in the expansion device 3, and then the d state changes to the C state by evaporation in the evaporator 4.

On the other hand, the refrigerant gas discharged from the intermediate discharge port 11 in the C state is condensed in the intermediate condenser 5 and changed from the e state to ra'
Then, by adiabatic expansion in the throttle means 6, the state changes from ra'g to the state g, and then, by evaporation in the evaporator 4, the state changes from the state g to the state a.

The low-temperature, low-pressure water supplied from the hot water supply piping 8 enters the intermediate condenser 5, where the medium-temperature and low-pressure water discharged from the intermediate discharge port 11 enters the intermediate condenser 5.
After being preheated by heat exchange with medium pressure refrigerant gas,
It enters the condenser 2, where it exchanges heat with the high-temperature, high-pressure refrigerant gas discharged from the discharge port 12, thereby increasing its temperature and being taken out as hot water.

In the above embodiment, a rotary compressor is used as the compressor 1, but it goes without saying that any type and structure of the compressor can be used as long as it can extract the gas during compression.

(Effects of the Invention) The present invention includes a refrigerant pipe that circulates refrigerant gas discharged from a discharge port of a compressor to a suction port of the compressor through a condenser, a throttle device, and an evaporator in this order; a refrigerant circuit that circulates refrigerant gas discharged from an intermediate discharge port in the middle of compression to the inlet of the evaporator via an intermediate condenser and a throttle means in this order; and a refrigerant circuit that circulates hot water through the intermediate condenser and the condenser in this order. Because hot water supply piping was installed to allow water to flow through,
Hot water is a medium-temperature water discharged from an intermediate outlet in an intermediate condenser.
After being preheated by exchanging heat with medium-pressure refrigerant gas, it is further heated by exchanging heat with high-temperature, high-pressure refrigerant gas discharged from the discharge port in the condenser, and becomes hot water.

As a result, despite having only -1 compressors, the 5th
It is possible to achieve the same high hot water supply performance as the two-stage compression type shown in the figure, and the equipment cost is reduced because the number of devices constituting the device is reduced compared to the conventional two-stage compression type. Also,
The suction pressure of the compressor only needs to be low, and therefore, unlike conventional two-stage compression type high-stage compressors, there is no need to compress refrigerant gas having a large specific weight, thereby avoiding mechanical troubles.

[Brief explanation of drawings]

1 to 3 show one embodiment of the present invention, in which FIG. 1 is a system diagram, FIG. 2 is a vertical sectional view of the compressor, and FIG. 3 is a Mollier diagram. FIG. 4 is a system diagram of a conventional two-stage compression system, and FIG. 5 is a system diagram of a conventional two-stage compression system.

Claims (1)

[Claims] A refrigerant pipe that circulates the refrigerant gas discharged from the discharge port of the compressor through a condenser, a throttle device, and an evaporator in this order to the suction port of the compressor, and a refrigerant gas discharged from the intermediate discharge port of the compressor during compression. A refrigerant circuit that circulates refrigerant gas to the inlet of the evaporator through an intermediate condenser and a throttle means in this order, and hot water supply piping that allows hot water to flow through the intermediate condenser and the condenser in this order. A heat pump water heater that is characterized by: