JPS6333093Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a heat pump type air conditioner.

A refrigeration cycle using a conventional capacity-controlled rotary compressor (hereinafter referred to as a compressor) liquefies refrigerant gas discharged from a compressor 1 in a condenser 2, as shown by the arrow in the system diagram in Figure 1. After passing through the capillary tube 3 and being gasified in the evaporator 4, it is sucked into the compressor 1, while a part of the high-pressure refrigerant exiting the condenser 2 is introduced into the compressor 1 through the control valve 5 and control piping 6. It's becoming like that.

In the compressor 1, Fig. 2 is a vertical sectional view, Fig. 3-
As shown in the cross-sectional view, the crankshaft 8 into which the rotor 9 is fitted is driven by the motor M and performs eccentric rotational movement in the direction of the arrow within the cylinder 10.
The refrigerant sucked into the cylinder 10 from the suction port 12 is compressed by reducing the space volume formed by the blades 11, the rotor 9, and the cylinder 10 as the crankshaft 8 rotates, and is then transferred to the discharge port 13 and a discharge (not shown). It is discharged into the housing 7 through the valve.

In the unload state, the control valve 5 is opened, and the pressure of the high-pressure refrigerant introduced into the working pressure introduction pipe 21 in the compressor through the control piping 6 as shown in FIG. moves the plunger 17 upward against the elastic force of the spring 22, and the refrigerant gas in the compression chamber 23 is transferred to the bypass hole 18 and the plunger small diameter section 2.
0, flows into the suction port 12 via the bypass pipe 19,
Until the contact point 16 between the rotor 9 and the cylinder 10 passes through the bypass hole 18, no compression is performed and the refrigerant capacity is reduced.

In addition, in the full load state, the control valve 5 is closed, high-pressure refrigerant is not introduced into the working pressure introduction pipe 21 in the compressor, and the plunger 17 is moved downward by the elastic force of the spring 22 to connect the bypass hole 18 and the bypass pipe. 19
is shut off, so the compressor operates as a normal compressor without a capacity control mechanism. 14 is an upper bearing plate, and 15 is a lower bearing plate.

However, such a capacity-controlled compressor requires a control valve to switch between unloading and full loading, and in order to be applied to a heat pump system, it must also be provided with piping for liquid injection.

Conventionally, heat pump systems have used electric heaters to perform heat up; however, due to power supply capacity considerations, capacity control type compressors have recently been developed that perform heat up without a heater.

The present invention was proposed in view of these circumstances, and the purpose is to provide a high-performance, long-life, and low-cost heat pump air conditioner that prevents failures and performs heating and cooling operations with high EER. year,
It is equipped with a capacity control valve that bypasses the refrigerant gas in the middle of compression to the suction side, which is switched by the pressure introduced into the control pressure introduction pipe, and has a liquid injection hole that injects liquid refrigerant into the refrigerant gas that is being compressed. In a heat pump air conditioner comprising a compressor, a four-way valve, an indoor heat exchanger, a throttling mechanism, and an outdoor heat exchanger, a passage connecting the liquid injection hole and the control pressure introduction pipe is provided. The pressure introduction pipe is connected to a control pipe whose one end is connected to a refrigerant circuit between the indoor heat exchanger and the throttling mechanism, and when heating by switching the four-way valve, the control pipe and the control pressure introduction pipe are connected. When the capacity control valve is switched to the full load position with high pressure liquid refrigerant introduced through The capacity control valve is switched to an unload position by low-pressure refrigerant introduced through the refrigerant.

To explain the embodiment of the present invention with reference to the drawings, Fig. 6 is a system diagram thereof, Fig. 7 is a cross-sectional view showing the first embodiment of the present invention, and Figs.
FIG. 8 is a fully loaded state and FIG. 9 is an unloaded state. FIG. 10 is a cross-sectional view showing the second embodiment of the present invention. FIG. is a partial sectional view taken along the line XI-XI in FIG. 10.

First, in the first embodiment shown in FIGS.
The same reference numerals as in Figs. 1 to 5 indicate the same members as in Figs. A control pipe is connected to the refrigerant pipe line between the heat exchanger 27 and the other end thereof is connected to the pressure introduction pipe 21 of the compressor 1; 30 is the lower end bearing plate 1;
A liquid injection hole 31 is bored in the lower bearing plate 15 and communicates with the pressure introduction pipe 21 which communicates with the control pipe 29 through a small hole 32, and the other end communicates with the pressure introduction pipe 21. This is a liquid injection passage communicating with the liquid injection hole 30.

In such an apparatus, first, during heating operation, the gas refrigerant compressed by the compressor 1 passes through the four-way valve 26 and is liquefied in the indoor heat exchanger 27, as shown by the broken line arrow in FIG. A part of the high-pressure refrigerant is evaporated in the outdoor heat exchanger 28 via the pillar tube 3 and sucked into the compressor 1 via the four-way valve 26, and liquefied in the indoor heat exchanger 27.
As shown in FIG. 8, the plunger 17 is pushed up and the bypass hole 18 and the bypass pipe 19 are cut off, so that the compressor is operated at full load.

At that time, the liquid refrigerant introduced into the pressure introduction pipe 21 inside the compressor passes through the small holes 32 and the liquid injection passage 3.
1. The liquid is injected into the cylinder during the compression stroke through the injection hole 30, lowering the temperature of the compressed gas and promoting cooling of the motor.

Next, during cooling operation, as shown by the solid line in FIG. 6, the gas compressed by the compressor 1 is
It is liquefied in the outdoor heat exchanger 28, passed through the capillary tube 3, evaporated in the indoor heat exchanger 27, and is sucked into the compressor 1 through the four-way valve 26.

Furthermore, since the pressure inside the control pipe 29 is low, low pressure is introduced into the pressure introduction pipe 21 inside the compressor.
As shown in FIG.
The bypass hole 18 is pushed downward by the force of 2.
Until the contact point 16 between the rotor 9 and the cylinder 10 passes through the bypass hole 18, the compression action will not take place and the refrigeration capacity will decrease. injection hole 30, liquid injection passage 31,
Small hole 32, pressure introduction pipe 21 in the compressor, control pipe 2
9 and enters the indoor heat exchanger 27, the cooling capacity is reduced.

According to such a device, during heating operation, the compressor is operated at full load and liquid is injected into the cylinder, and during cooling operation, the compressor is operated at unload operation, and a portion of the gas being compressed is also pumped out. This allows air to escape to the low pressure side and reduce cooling capacity without requiring any control valve other than a four-way valve.
Moreover, it can be realized with only one control pipe to the compressor.

In the second embodiment shown in FIGS. 10 and 11, a liquid injection passage 33 is formed in the cylinder 10 on the lower side surface of the plunger insertion hole 25, and this is communicated with a liquid injection passage 31 formed in the lower bearing plate 15. During cooling operation, the plunger 17 closes the liquid injection passage 33.
, and the gas being compressed from inside the cylinder is stopped from flowing into the indoor heat exchanger 27 via the pressure introduction pipe 21 and the control pipe 29 .

In the above embodiment, the capacity control is performed using a plunger, but the capacity control of the compressor can also be performed using a valve other than the plunger.

Also, instead of providing the liquid injection hole 30 in the lower bearing plate, it can also be provided in the cylinder or the upper bearing plate.

In short, according to the present invention, the capacity control valve is switched by the pressure introduced into the control pressure introduction pipe and bypasses the refrigerant gas in the middle of compression to the suction side. In a heat pump air conditioner comprising a compressor, a four-way valve, an indoor heat exchanger, a throttling mechanism, and an outdoor heat exchanger, the liquid injection exit hole is in communication with the control pressure introduction pipe. connecting the pressure introduction pipe to a control pipe connected at one end to a refrigerant circuit between the indoor heat exchanger and the throttling mechanism;
During heating by switching the four-way valve, high-pressure liquid refrigerant is introduced through the control pipe and control pressure introduction pipe, and when the capacity control valve is switched to the full load position, the same liquid refrigerant is supplied to the passage and the liquid refrigerant. During cooling, the capacity control valve is switched to the unload position using low-pressure refrigerant introduced through the injection exit hole and introduced through the control pipe and pressure introduction pipe, thereby preventing failures and achieving high EER for heating and cooling. The present invention is extremely useful industrially because it provides a heat pump type air conditioner with high performance, long life, and low cost.

[Brief explanation of the drawing]

Figure 1 is a system diagram of a refrigeration cycle using a conventional capacity-controlled rotary compressor, Figure 2 is a vertical cross-sectional view of the compressor in Figure 1, and Figure 3 is a cross-sectional view taken along - in Figure 2. Figures 4 and 5 are partial sectional views taken along - in Figure 3, with Figure 4 showing the unloaded state and Figure 5 showing the fully loaded state, respectively.
FIG. 6 is a refrigerant system diagram of the present invention, FIG. 7 is a cross-sectional view showing the first embodiment of the present invention, and FIGS. 8 and 9 are partial sectional views taken along - in FIG. 8
The figure shows a fully loaded state, and Fig. 9 shows an unloaded state. Fig. 10 is a cross-sectional view showing the second embodiment of the present invention. Fig. 11 is a partial cross-section taken along the line XI-XI in Fig. 10. It is a diagram. 1... Capacity control compressor, 2... Condenser, 3...
... Capillary tube, 4 ... Evaporator, 8 ... Crankshaft, 9 ... Rotor, 10 ... Cylinder, 11 ... Blade, 12 ... Inlet, 13 ...
...Discharge port, 14... Upper bearing plate, 15... Lower bearing plate, 16... Contact point, 17... Plunger, 1
8...Bypass hole, 19...Bypass pipe, 20...
... Plunger small diameter part, 21 ... Pressure introduction pipe, 22
... Spring, 23 ... Compression chamber, 24 ... Upper stopper, 25 ... Plunger insertion hole, 26 ... Four-way valve, 27 ... Indoor heat exchanger, 28 ... Outdoor heat exchanger, 29 ... Control pipe , 30...Liquid injection hole, 31...Liquid injection passage, 32...
...Small diameter, 33...Liquid injection passage, M...
…motor.

Claims (1)

[Scope of utility model registration request] It is equipped with a capacity control valve that bypasses the refrigerant gas in the middle of compression to the suction side, which is switched by the pressure introduced into the control pressure introduction pipe, and has a liquid injection hole that injects liquid refrigerant into the refrigerant gas that is being compressed. In a heat pump air conditioner comprising a compressor, a four-way valve, an indoor heat exchanger, a throttling mechanism, and an outdoor heat exchanger, a passage connecting the liquid injection hole and the control pressure introduction pipe is provided. The pressure introduction pipe is connected to a control pipe whose one end is connected to a refrigerant circuit between the indoor heat exchanger and the throttling mechanism, and when heating by switching the four-way valve, the control pipe and the control pressure introduction pipe are connected. When the capacity control valve is switched to the full load position with high pressure liquid refrigerant introduced through A heat pump type air conditioner characterized in that the capacity control valve is switched to an unload position by low pressure refrigerant introduced through the heat pump type air conditioner.