JPH0212347B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a refrigeration system having an electromagnetic oscillating compressor, and particularly to its discharge pressure regulating valve and release circuit.

Configuration of conventional example and its problems The applicant first filed a patent application in order to guarantee the piston stroke of a vibrating compressor at low outside temperatures.
No. 56-212879, a discharge gas pressure regulating valve is installed in the high-pressure side piping and opens when the discharge gas pressure reaches a predetermined pressure difference from atmospheric pressure, thereby eliminating the reduction in piston stroke at low outside temperatures. However, since this discharge gas pressure regulating valve operates based on atmospheric pressure, the discharge gas pressure is always constant, but the pressure on the low pressure side inside the sealed container tends to decrease as the outside temperature gets lower. As the outside temperature decreases, the pressure difference between the discharge gas pressure and the low-pressure side pressure tends to increase. Therefore, at even lower outside temperatures, the piston stroke cannot maintain a constant value and increases. It was found that excessive stroke occurred at extremely low outside temperatures of ℃.

OBJECTS OF THE INVENTION An object of the present invention is to increase the pressure on the low pressure side when the outside temperature is low, and to suppress excessive stroke of the piston at extremely low outside temperatures such as 0° C. and 5° C., for example.

Structure of the Invention In order to achieve this object, a release circuit is provided, which includes a discharge gas pressure regulating valve disposed upstream of the condenser, and a release valve connecting the upstream side of the discharge gas pressure regulating valve and the downstream side of the evaporator. The release circuit prevents an unnecessary drop in the pressure on the low pressure side when the outside temperature is low, and prevents an excessive stroke.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.

1 is an electromagnetic vibration compressor, 2A is a discharge pressure regulating valve (hereinafter simply referred to as valve 2A), 3 is a capacitor,
Reference numeral 4 indicates a pressure reducer such as a capillary tube, and reference numeral 5 indicates an evaporator, which are sequentially connected in a ring to form a refrigeration cycle. B is the release circuit, B1 is the release inlet line, the discharge line A and the release valve 2B
(hereinafter simply referred to as valve 2B),
B2 is the release outlet line, and the suction line C
and the release valve 2B.

The valve 2A has two almost cup-shaped cases 6a, 6.
b constitutes an outer shell 6, and the inside of the outer shell 6 is airtightly divided into an upper chamber 8 and a lower chamber 9 by a diaphragm 7. 10 is an inlet pipe for introducing the discharge gas of the compressor 1 into the lower chamber 9, and 11 is an outlet pipe. 1
2 is a ball valve 12a fixed to the substantially lower surface of the diaphragm 7, and a valve seat 12 connected to the outlet pipe 11.
The valve body consists of b. On the other hand, a coil spring 14 is arranged in the upper chamber 8 via a holder 13 provided on the diaphragm 7. An adjustment cap 15 having a threaded portion 15a is screwed into the case 6a at the upper end of the coil spring 14, and a communication hole 15b is provided in the center of the cap for communicating the upper chamber 8 with the outside air. Therefore, the upper chamber 8 side of the diaphragm 7 is loaded with both atmospheric pressure and the biasing force of the coil spring 14. The valve 2B is almost the same as the valve 2A, but an adjustment cap 17 with a threaded portion 16 is screwed into the case 18, and after adjusting the valve setting pressure,
It is welded 20 to the outer shell 19 to maintain airtightness from the atmosphere. In addition, a lower chamber 21 is located in the center of the adjustment cap 17.
A communication hole 22 that communicates with the inside of the suction line C is provided. Therefore, the low pressure in the suction line C and the coil spring 24 are connected to the lower chamber 21 side of the diaphragm 23.
Both of the urging forces are loaded. B3 is a communication pipe connecting the communication hole 22 and the suction line C.

Although the structure of the vibratory compressor itself is not the gist of the present invention, the structure of a typical compressor 1 will be briefly described. 1a is a piston that slides within the cylinder 1b, and the piston 1a is provided with a suction passage and a suction valve (not shown). 1c is a fixed iron core having a winding, 1d is a movable iron core fixed to the piston 1a, 1e is a resonance spring, 1f is a valve plate, 1
g is a discharge valve that opens when the pressure inside the cylinder 1b exceeds a predetermined value, 1h is a cylinder head, 1i is a discharge pipe, and 1j is a suction pipe. As is well known, this compressor 1 attracts the movable core by energizing the windings of the fixed core using the magnetic variable resistance principle, and then repulses it by the energy stored in the resonance spring 1e, and this process is repeated. It vibrates due to

Next, the operation of the above configuration will be explained.

The gas discharged from the compressor 1 is passed through the inlet pipe 10
It then flows into the lower chamber 9 which is divided into upper and lower parts by the diaphragm 7 of the valve 2A. At this time, the valve body 12 is closed. Therefore, the pressure in the lower chamber 9 is increased. Since the lower chamber 9 is much smaller than the capacitor 3, the pressure is instantly increased. As a result, the pressure in the lower chamber 9, that is, the pressure in the inlet pipe 10 acts as a force pushing up the diaphragm 7, and the force of the coil spring 14 pushing down the diaphragm 7 and the adjustment cap 15
For example, when the pressure of the inlet pipe 10 reaches a pressure of 12 kg/cm ² G, the diaphragm 7 is lifted and the ball valve is closed. 12a from the valve seat 12b, that is, the valve 12
The circuit is opened and gas flows into the condenser 3, and the refrigerant is circulated through the pressure reducer 4 and the evaporator 5 to form a refrigeration cycle.

Figure 2 shows the relationship between the pressure of the condenser 3 and the pressure of the inlet pipe 10 in a steady state. When the condenser 3 pressure is lower than the operating pressure of the valve 2A, 12 kg/cm ² G, the valve 2A is half open. Due to the throttling action in the state of
The operating pressure of A is 12 kg/cm ² G, and above 12 kg/cm ² G, the valve body 12 is completely opened and the pressure of the condenser 3 and the pressure of the inlet pipe 10 become approximately equal.

Next, the release action will be explained.

The pressure of condenser 3 is the operating pressure of valve 2A 12Kg/
When lower than cm ² G, the pressure in the upper chamber 25 of the valve 2B is
The force of the coil spring 24 is constant at 12 kg/cm ² G, acts as a force pushing down the diaphragm 23 of the valve 2B, and the suction line is applied to the lower part of the diaphragm 23 through the communication hole 22. For example, when the sum of the low pressure side pressures in C becomes less than 12Kg/cm ² G, the suction line C
When the internal low pressure side pressure becomes 0 Kg/cm ² G or less, the valve 2B opens and the high and low pressures are released. Further, when the condenser 3 pressure is 12 Kg/cm ² G or more, the pressure in the upper chamber 25 of the valve 2B is equal to the condenser pressure, and when the low pressure side pressure is below (condenser pressure - 12 Kg/cm ² G), the valve 2B opens. High and low pressures are released.

The above action will be explained from the viewpoint of actual operation of a refrigerator (freezer) as follows.

When the compressor 1 starts operating at a low outside temperature (for example, outside temperature 15°C), both valves 2A and 2B are closed at the beginning, and the inlet pipe 1
0 and the pressure in the release inlet line B1 is instantaneously
The pressure in the inlet pipe 10 and the release inlet line B1 is maintained at 12 Kg/cm ² G, and the pressure in the condenser 3 is maintained at 15° C. when the outside air temperature reaches 12 Kg/cm ² G and the valve 2A opens. The condensation pressure of the refrigerant is maintained at approximately 5 to 6 kg/cm ² G corresponding to the refrigeration cycle. At this time, the pressure in the communication hole 22 of the valve 2B, that is, the low pressure side pressure in the suction line C, decreases with time, and when it reaches 0 kg/cm ² G, the pressure in the communication hole 22 of the valve 2B decreases with time.
B opens, but the same throttling action as valve 2A works and the low pressure side pressure in suction line C is maintained at 0 kg/cm ² G, so the presence of valve 2B makes it possible to set the valve operating pressure of valve 2A. The pressure difference between the discharge pressure and the suction pressure is constant at low outside temperatures (Fig. 2).
The resonant frequency remains constant (Figure 3). the result,
The piston stroke can be stably improved even at low outside temperatures (Fig. 4), and refrigeration capacity and efficiency can be improved. In addition, since the release circuit B can prevent the low pressure from falling below 0 kg/cm ² G, the pressure difference between high and low pressure can be kept below the reference value, so the operating pressure of the valve 2A can be set high (12
Kg/cm ² G), and the refrigerating capacity can be increased by increasing the pressure on the high pressure side.

Effects of the Invention As described above, the present invention provides an electromagnetic vibration compressor,
A release circuit including a condenser, a pressure reducer, an evaporator, a discharge pressure regulating device disposed upstream of the condenser, and a release valve connecting the upstream side of the discharge pressure regulating valve and the downstream side of the evaporator, The release circuit suppresses unnecessary drops in low-pressure side pressure at low outside temperatures, maintains the difference between high-pressure side pressure and low-pressure side pressure at a constant value, prevents excessive stroke at low outside temperatures, and adjusts discharge pressure. This makes it possible to increase the operating pressure of the valve, thereby improving refrigeration capacity and efficiency.

[Brief explanation of drawings]

Fig. 1 is a refrigeration system diagram including a partially enlarged sectional view of a refrigeration system equipped with a vibrating compressor showing an embodiment of the present invention, and Figs. 2, 3, and 4 show the outside air temperature and the low pressure side, respectively. It is a figure showing the relationship between pressure/discharge pressure, resonance frequency, and piston stroke. 1... Electromagnetic vibration compressor, 1k... Sealed container,
3... Capacitor, 4... Pressure reducer, 5... Evaporator, 2A... Discharge pressure regulating valve, 2B... Release valve, B... Release circuit.

Claims (1)

[Claims] 1 A refrigeration system that sequentially connects an electromagnetic oscillating compressor, a condenser, a pressure reducer, and an evaporator, including a discharge pressure regulating valve disposed upstream of the condenser, and a discharge pressure regulating valve disposed upstream of the discharge pressure regulating valve and the evaporator. a release circuit including a release valve that connects the downstream side of the discharge pressure regulating valve; first and second pressure-responsive bodies that divide the interior of the discharge pressure regulating valve and the interior of the release valve into two chambers, respectively; A refrigeration system comprising an electromagnetic vibration compressor having a communication hole that communicates a chamber with outside air, and a communication pipe and communication hole that connect one chamber in the release valve and a downstream side of the evaporator.