JPH0121428B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an air conditioning heat pump device,
In particular, the present invention relates to a heat pump device that can improve heating capacity.

In the conventional heat pump device shown in FIG. 1, it takes time for the temperature of the compressor 11 to reach a predetermined level or higher during heating operation, and therefore the discharge pressure rises slowly, and it takes a long time for the temperature of the condenser 12 to rise. In order to solve the problem of requiring a
A method of arranging the This is to temporarily throttle the discharge side of the compressor 11 using the throttle valve 13 to increase the pressure of the compressed refrigerant in the compressor 11, thereby increasing the temperature of the compressor 11 in a short time. FIG. 2 shows a Mollier diagram of the heat pump device shown in FIG. 1, in which the dotted line shows the case of normal operation without throttling the throttle valve 13, and the solid line shows the case when the throttle valve 13 is throttled. As is clear from this diagram, throttle valve 1
3, the compression work increases, and this increase is equal to G, where G is the refrigerant circulation amount of the evaporator 14.
(i ₂ −i ₁ )Kcal/H. In other words, the heating capacity is improved by this increase.

However, if the outside air is very cold,
The amount of heat absorbed from the evaporator 14 is small, the amount of heat pumped into the condenser 12 is reduced, and the indoor heating capacity may drop significantly. It is not possible to compensate for this decrease in heating capacity only by operating the throttle valve 13. difficult.

The present invention has been made in view of these points, and an object of the present invention is to provide a heat pump device that can more effectively improve heating capacity.

The present invention is characterized in that an injection piping is connected to the compression chamber of the compressor during compression, and a throttle valve is disposed in the injection piping.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 is a circuit diagram of a heat pump device according to the present invention. On the discharge side of the compressor 11, a throttle valve 13, such as a flow rate regulating valve or an on-off type solenoid valve, is arranged, followed by a condenser 1.
2 are connected. In the compression chamber (not shown) in the middle of compression of the compressor 11, the compressor 11
An injection piping 15 is connected from the discharge port side of the pump, and a throttle valve 16 such as a flow rate regulating valve or an on-off type electromagnetic valve is disposed in the middle of the injection piping 15. An evaporator 14 is connected to the suction side of the compressor 11, and a capillary tube 17 is disposed between the condenser 12 and the evaporator 14.

Next, the operation and effects of this embodiment having such a configuration will be explained.

First, when performing normal operation, the throttle valve 13
This is done by fully opening the throttle valve 16 and fully closing the throttle valve 16. In this case, the Mollier diagram becomes as shown by the broken line in FIG. Next, when increasing the heating capacity, the throttle valve 13 is throttled down by an appropriate amount, and the throttle valve 16 is fully opened. By fully opening the throttle valve 16, high-pressure refrigerant gas is injected into the compression chamber of the compressor 11 through the injection piping 15, and in the Mollier diagram shown in FIG.
The gas state in the cylinder at point moves to point g. Therefore, the compression work in this case is Gi ₃
+(G+M)i ₄ , which is increased compared to the conventional example shown in FIGS. 1 and 2. Note that M is the flow rate of injection gas, and Pi is the average injection pressure. This increase in compression work increases the heating capacity, but the adjustment for this increase is
This can be done continuously by controlling the throttling rates of the throttle valves 13 and 16.

In addition, if the compressor is cold at the start of operation, the throttle valve 13 is fully closed and the throttle valve 16 is fully open to quickly raise the temperature of the compressor and quickly increase the discharge pressure. can do. As a result, the required heating operation can be started in a short time, and the power consumption of the compressor can be reduced.

FIG. 5 is a diagram showing another embodiment of the present invention.
In this embodiment, throttle valves 13 and 16
are combined into one throttling-adjustable three-way valve 18 and arranged on the discharge side of the compressor 11,
It is connected to the condenser 12 as well as an injection piping 15. In this way, two throttle valves 13 and 16 are combined into one three-way valve 1.
8, the piping configuration can be simplified.

Further, by enabling automatic opening/closing control of the throttle valves 13 and 16, it is possible to control the heating capacity increase even more efficiently. That is,
If the compressor temperature, discharge pipe temperature, condenser temperature, indoor or outdoor air temperature, system pressure, etc. are detected, or automatically detected for a certain period of time immediately after the system is started, and then opened, closed, or adjusted, energy can be reduced. You can drive comfortably and with good consumption efficiency.

As described above, according to the present invention, heating capacity can be improved temporarily or continuously, and efficient heating operation can be performed in a single hour. Furthermore, by improving the heating capacity even when the outside air temperature is very low, there is no need to additionally install a heater on the indoor side (on the condenser side) as in the past, making it safe and inexpensive.

As explained above, according to the present invention, a large heating capacity can be obtained with a small capacity compressor.

In addition, by using a four-way valve in the refrigerant circuit, it is also possible to use it as an air conditioner for both heating and cooling purposes.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an example of a conventional heat pump device, FIG. 2 is a Mollier diagram of the heat pump device shown in FIG. 1, FIG. 3 is a circuit diagram of a heat pump device according to the present invention, and FIG. FIG. 5 is a circuit diagram showing another embodiment of the present invention. 11... Compressor, 12... Capacitor, 13
... Throttle valve, 15... Piping for injection extension, 16
... Throttle valve, 18... Three-way valve.

Claims (1)

[Scope of Claims] 1. In a heat pump device in which a throttle valve is disposed on the discharge side of a compressor and an injection piping is connected to a compression chamber in the middle of compression of the compressor, the throttle valve is disposed in the injection piping. A heat pump device characterized by: 2. Claim 1, characterized in that a three-way valve is disposed on the discharge side of the compressor, and the three-way valve and the compression chamber in the middle of compression of the compressor are connected by injection piping. heat pump equipment. 3. The heat pump device according to claim 1, wherein the throttle valve is automatically controlled to open and close.