JPH01159486A - Refrigerating unit - Google Patents

Abstract

PURPOSE:To allow refrigerant in respective hermetic containers having a pair of through-holes to be equal in pressure by arranging a through-hole tangent to the inner diameter side at a position which is advanced approximately by 180 deg. along a spiral curve with respect to the other through-hole tangent to the outer diameter side. CONSTITUTION:Through holes 17a and 17b allows an introduction pipe 18 to communicate a hermetic space 12 with the output of a condenser 14. The through-hole 17a is arranged at a position tangent to the involute curve on the outer diameter side of a stationary scroll lap 20, and the other through-hole 17b is arranged at a position which is tangent to the involute curve on the inner diameter side of the stationary scroll lap 2a and is concurrently advanced approximately by 180 deg. in angle from the through-hole 17a along the involute curve. This constitution thereby allows refrigerant in respective hermetic spaces 12 to be equal in pressure, thereby allowing the quantity of low temperature refrigerant flowing into respective chambers from the introduction pipe 18 to be equal.

Description

[Detailed description of the invention]

The present invention relates to a refrigeration system equipped with a scroll compressor for refrigeration and cooling, and in particular, its purpose is to reduce the compression work and increase the refrigerant discharge amount by cooling the inside of the cylinder of the scroll compressor. The objective is to provide a highly efficient refrigeration system. There are already many examples of introducing high-pressure refrigerant from a condenser into the cylinder of a conventional compressor, in rotary type, especially rolling piston type compressors, and each method has been effective. . In other words, by providing an injection hole near the intermediate pressure point of the cylinder of the rotary compressor and injecting the liquid refrigerant discharged from the condenser, it is possible to prevent abnormal rises in the refrigerant discharge temperature of the rotary compressor and increase the amount of refrigerant discharged. I've been trying. On the other hand, scroll type compressors have recently been attracting attention as refrigeration compressors. The operating principle of a scroll compressor is shown in Figure 1a.
This will be explained with reference to Figure 1. Fig. 1a shows the phase relationship between the movable scroll wrap 1a and the fixed scroll wrap 2a in a state where compression is started at the same time as suction is completed; , Fig. 1 shows a state in which the movable scroll wrap 1a has been rotated 90 degrees counterclockwise from the state shown in Fig. 1C. As the state shown in FIG. 1a changes to the state shown in FIG. 1 and FIG. As a result, compressed refrigerant is discharged. Then, by further rotating the movable scroll/relap 1 by 90 degrees from the state shown in FIG. 1 d, it returns to its original state, that is, shown in FIG.
Return to state. In FIGS. 1a to 1d, the closed space is formed by the radial contacts 4 of the two scroll wraps 1a, 2a. Under the above working principle, the conventional flow compressor is
This will be explained with the help of a diagram. A fixed scroll 2 is fixed to the housing 6 and includes an end plate 2b provided with a discharge hole 3 and a fixed scroll wrap 2a having an involute curve standing upright on the end plate 2b. Reference numeral 1 denotes a movable scroll, which consists of an end plate 1b and a movable scroll wrap 1a formed by an involute curve standing upright on the end plate 1b. The movable scroll wrap 1 is attached to the crank portion 8a of the freely supported shaft 8 via a bearing 7b.
a is engaged with the fixed scroll wrap 2a. Reference numeral 9 denotes a rotation prevention mechanism provided to prevent the movable scroll 1 from rotating, and is fixedly attached to the frame 6. The shaft 8 is connected to the stator 10. Driven by a motor consisting of a rotor 11, the movable Nuclor/v1 moves relative to the fixed Nuclor 2 as shown in FIG. 1 to raise the pressure of the refrigerant Ganu in the closed space 12. In the above conventional scroll compressor, the closed space 1
2, leakage of refrigerant gas from, for example, the radial contact 4, the end face between the movable scroll wrap 1a and the fixed scroll end plate 2b, or conversely, the end face between the fixed scroll wrap 2a and the movable scroll end plate 1b. This is unavoidable, and the refrigerant gas in the closed space 12 has the disadvantage that high-temperature gas flows in from the high-pressure section and is overheated, resulting in generally lower volumetric efficiency and poor performance. In addition, when the compressor is stopped, the refrigerant gas in the sealed space 12 remains trapped, and it is difficult to balance the refrigerant pressure during the stoppage, so when the compressor is restarted, an excessive load is applied, resulting in large capacity The disadvantage was that it required a motor. The present invention has been made in view of the above drawbacks, and the structure and operation of the present invention will be explained below with reference to FIG. For convenience, parts with the same functions as those in FIG. 2 are given the same reference numerals. 1 is a fixed scroll with a wrap made of an involute curve formed upright on an end plate, 2 is a movable scroll also having a wrap made of an involute curve, and is engaged with the fixed SFlow/L/1 with the wrap inside. A closed space 1 closed by both scrolls 1.2 is made by rotating L/2 with respect to a fixed flow)vl.
It is equipped with a scroll compressor 13 that boosts the pressure of refrigerant gas in 2, a condenser 14, a pressure reducer 15. The evaporator 16 and the like are connected to form a refrigerant circuit. 17 is fixed flow/L/2
There are two through holes in the mirror plate in this case. An introduction pipe 18 is provided which connects the closed space 12 and the outlet of the condenser 14 via the through hole 17. The through hole 17 is provided at a position such that the refrigerant pressure in the sealed space 12 is approximately the middle (geometric mean) of the suction pressure at the suction pipe 19 of the Nuclor compressor 13 and the discharge pressure at the discharge hole 3. Two through holes 17 are provided, and as shown in FIG.
b is in contact with the involute curve on the inner diameter side of the fixed scroll wrap 2a, and is also provided at a position angularly advanced by approximately 180° in the involute curve from the through hole 17a. In this way, each sealed space 12a has through holes 17a and 17b. The refrigerant pressure within 12b is approximately the same. Further, a pressure reducer 20 is provided for adjusting the refrigerant pressure in the closed space 12 within the introduction pipe 18. The operation in the above configuration will be explained. When the scroll compressor 13 is operated and the movable Nuclor 1 is rotated relative to the fixed Nuclor 2 as shown in FIG. It flows into the condenser 14, is liquefied and condensed, and is throttled by the pressure reducer 16 to become a low-pressure refrigerant.The evaporator 16 absorbs heat and evaporates the low-pressure gas, and the low-pressure gas is returned to the compressor 13 through the suction pipe 19 for cooling or freezing. In this case, the pressure of the high-pressure refrigerant liquid at the outlet of the condenser 14 is adjusted by the pressure reducer 20 through the introduction pipe 18, and becomes a low-temperature refrigerant, which flows into the closed spaces 12a and 12b through the through holes 17a and 17b, respectively, and has already been pressurized to an intermediate pressure. The refrigerant gas in the closed space 12 is cooled to reduce compression work, and the amount of compressed refrigerant increases, improving the performance of the compressor 13. Also, the closed space 12a
, 12b are equal, so the amounts of low-temperature refrigerant flowing into each from the introduction pipe 18 are equal, and therefore the refrigerant pressures in the closed spaces 12a and 12b after the low-temperature refrigerant flows are also equal, so that they merge together. Even when the discharge hole 3 is connected to the discharge hole 3, there is no mutual flow or turbulence, so there is no loss. In the present invention, a through hole 17 is provided in the end plate of the fixed flow/l/2 in order to introduce the refrigerant liquid at the outlet of the condenser 14 into the scroll compressor. It is also possible to introduce liquid, but since the movable Suflow/L/1 makes a rotating movement and piping must be routed inside the Nuclor compressor 13, it is necessary to introduce the liquid through the end plate side of the fixed Nuclor/I/2. Providing holes is the simplest and most effective method. Alternatively, an electromagnetic valve may be provided in the introduction pipe 18 to control opening and closing in accordance with the pressure and temperature of the gas discharged from the compressor 13, which controls the timing of introducing the high-pressure refrigerant liquid. As is clear from the above description, the refrigeration system of the present invention has a through hole on the end plate side of the fixed scroll, so that refrigerant liquid can be easily and inexpensively introduced into the cylinder in the compressor, and once inside the compressor, the refrigerant can be introduced into the cylinder in the compressor. It is possible to cool the high-temperature refrigerant gas that has been pressurized to about an intermediate pressure to reduce the compression work and increase the amount of refrigerant discharged, improving the performance of the compressor. Since the low-temperature refrigerant is introduced into the sealed space cylinder where the refrigerant pressure is the same, it is possible to select approximately the same introduction amount, and the torque paranne is also good. Because they are equal, there is no backflow or turbulence between them, so there is little loss, and by installing a pressure reducer in the inlet pipe, it is possible to adjust the refrigerant pressure and amount introduced into the closed space of the compressor, and when the compressor is stopped, the cylinder Since the refrigerant flows into the inlet pipe in the opposite direction from the closed space, the refrigerant pressure is increased smoothly, and there are excellent effects such as no excessive load being applied upon restart.

[Brief explanation of the drawing]

Figures 1a, b, c, and d are positional relationship diagrams of fixed and movable scroll wraps showing the operating principle of a scroll compressor, respectively; Figure 2 is a cross-sectional view of main parts of a conventional scroll compressor;
The figure is a refrigerant circuit diagram of a refrigeration system in an embodiment of the present invention,
FIG. 4 is a sectional view of essential parts showing the fixed and movable scroll lamps of the Nuclor compressor of the refrigeration system. 1...Movable scroll, 1a...Movable scroll wrap, 2...Fixed scroll, 2
a...Fixed scroll wrap, 3...
Discharge hole, 9... Rotation prevention mechanism, 12...
・Closed space, 17a, 17b...Through hole, 18
...Introduction pipe, 20 ...Reducer. Name of agent: Patent attorney Shigetaka Awano and 1 other person 1st
Figure 2 Amendment to Figure Procedure October 1983 2G+ Refrigeration Equipment 3 Amendment Person Case Patent Application Person Address 1006 Kadoma, Kadoma City, Osaka Name Name (582) Matsushita Electric Industrial Co., Ltd. representative
Akio Tanii 4 Agent 571 Address 1006 Oaza Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. Figures 6 and 6 of the drawings subject to the 6th amendment will be added as attached. Description 1, Title of Invention Refrigeration Device 2, Claims A fixed scroll and a movable scroll having a linear curved wrap formed on the end plate are engaged with each other with the wraps inside, and the movable scroll is connected to the fixed scroll. In a scroll compressor that makes an orbiting motion to pressurize a closed space closed by both the scroll wraps, an even number of through holes are provided in the end plate of the fixed scroll or the movable scroll, and half of the through holes are formed by the fixed scroll wrap or the movable scroll. The through holes in contact with the outer diameter side of the movable scroll wrap are in contact with the inner diameter side of the fixed scroll wrap or the movable scroll wrap, and the through holes in contact with the inner diameter side are in contact with the through holes in contact with the outer diameter side. On the other hand, the helical curve is approximately at an angle of 180 degrees with respect to the center of the end plate of the fixed scroll.
° A refrigeration device installed at an advanced position. 3. Detailed Description of the Invention Field of Industrial Application The present invention relates to a refrigeration system equipped with a scroll compressor for refrigeration and cooling. BACKGROUND OF THE INVENTION Scroll type compressors have recently been attracting attention as refrigeration compressors. The third principle of operation of such a scroll compressor is
This will be explained with reference to FIG. 3(a) to FIG. 3(d). FIG. 3(a) shows the phase relationship between the movable scroll wrap 1a and the fixed scroll wrap 2a in a state where compression starts at the same time as suction is completed, and FIG. 3(b), FIG. 3(C),
Figure (d) is Figure 3 (a) and Figure 3 (b), respectively. A state in which the movable scroll wrap 1a is rotated 90 degrees counterclockwise from the state shown in FIG. 3(C) is shown. As the state of FIG. 3(a) shifts to the states of FIG. 3(b) and FIG. 3(C), the closed space formed by both scroll wraps la and 2a decreases, the refrigerant is compressed, and the closed space The compressed refrigerant is discharged by communicating with the discharge hole 3. Then, by further rotating the movable scroll wrap 1a by 90 degrees from the state shown in FIG. 3(d), it returns to its original state, that is, as shown in FIG.
). In FIGS. 3(a) to 3(d), the closed space is formed by the radial contacts 4 of both scroll wraps la, 2a. A conventional scroll compressor will be explained with reference to FIG. 4 based on the above operating principle. A fixed scroll 2 is fixed to the housing 5 and includes an end plate 2b provided with a discharge hole 3 and a fixed scroll wrap 2a having an involute curve standing upright on the end plate 2b. 1 is a movable scroll, and a mirror plate 1b
And this end plate 1bl': consists of a movable scroll wrap 1a formed by an upright involute curve, and this movable scroll 1 has a frame 6 fixed to a housing 5.
It is attached via a bearing 7b to a crank portion 8a of a shaft 8 which is rotatably supported via a bearing 7a, and the movable scroll wrap 1a is assembled so as to mesh with the fixed scroll wrap 2a. 9 is movable scroll 1
A rotation prevention mechanism is provided to prevent the frame 6 from rotating.
It is firmly attached to the Shaft 8 is stator 1
Driven by a motor consisting of a 0° rotor 11, the movable scroll 1 moves relative to the fixed scroll 2 as shown in FIG. 3, thereby increasing the pressure of the refrigerant gas in the closed space 12. In the scroll compressor as described above, a through hole is provided in the movable scroll 1 or the fixed scroll 2 to take out the compressed refrigerant in the closed space 12 or to remove the compressed refrigerant from the closed space 12.
There are devices that inject refrigerant gas into the interior (for example, JP-A-55
-37520, JP-A-53-119412, JP-A-54-81513). Problems to be Solved by the Invention However, in conventional scroll compressors in which through holes are provided in the movable scroll or the fixed scroll, one through hole is provided at a position approximately 180° ahead of the other through hole. Therefore, the two through holes were not always located in different sealed spaces under the same pressure conditions. This will be explained using FIGS. 5 and 6. In FIG. 5, one through hole 21 is located in the center between the fixed scroll wraps, and the other through hole 22 is in contact with the outer diameter side of the fixed scroll wrap, and in FIG. 6, one through hole 31 is located in the center between the fixed scroll wraps. The other through hole 32, which is in contact with the inner diameter side of the wraps, is shown provided in the center between the fixed scroll wraps. And each (A) has a crank angle of Oo
In this case, (B) in the same figure shows the case where the crank angle is 180°. First, in FIG. 5, A is located in a different closed space under the same pressure conditions, but the opening areas are different, so the flow resistance is different and the pressure is uneven. In addition, the image shown in FIG. 2B is located within the same compression space. Next, in FIG. 6, (A) is located in a different closed space under the same pressure conditions, but the flow resistance is different. In addition, the same figure (B) is located in the compression space under different pressure conditions. Therefore, in conventional scroll compressors of this type, the provision of through holes creates an imbalance in the pressure within the closed space, causing problems such as extra torque being applied to the rotation prevention mechanism of the movable scroll and performance deterioration. had. Therefore, an object of the present invention is to always equalize the refrigerant pressure in each sealed space having a pair of through holes in a compressor provided with through holes for introducing or deriving refrigerant. Means for Solving the Problems To achieve the above object, the present invention provides that half of the through holes are in contact with the outer diameter side of the fixed scroll wrap or the movable scroll wrap, and the remaining half of the through holes are in contact with the fixed scroll wrap or the movable scroll wrap. The through hole that is in contact with the inner diameter side of the movable scroll wrap and the through hole that is in contact with the inner diameter side has the helical curve advanced by an angle of approximately 180° about the center of the end plate of the fixed scroll with respect to the through hole that is in contact with the outer diameter side. It is located at the same location. Effect: Due to the above-mentioned means, pairs of through holes are always located in different sealed spaces under the same pressure conditions. EXAMPLE An example of the present invention will be described below with reference to FIG. 1, which shows a configuration for introducing refrigerant gas into a closed space. For convenience, parts with the same functions as those in FIG. 4 are given the same reference numerals. 1 is a fixed scroll with a wrap made of an involute curve formed upright on an end plate, and 2 is a movable scroll with a wrap made of the same (involute curve), which is engaged with the fixed scroll 1 with the wrap inside, and the movable scroll 2 is fixed. make a rotating movement with respect to the scroll 1,
It is equipped with a scroll compressor 13 that boosts the pressure of refrigerant gas in a closed space 12 closed by both scrolls 1.2, a condenser 14, a pressure reducer 15. The evaporator 16 and the like are connected to form a refrigerant circuit. Reference numeral 17 indicates through holes provided in the end plate of the fixed scroll 2, and in this case, two through holes are provided. An introduction pipe 1 that connects the closed space 12 and the outlet of the condenser 14 through this through hole 17
There are 8. The through hole 17 is provided at a position such that the refrigerant pressure in the closed space 12 is approximately the middle (geometric mean) of the suction pressure at the suction pipe 19 of the scroll compressor 13 and the discharge pressure at the discharge hole 3. Two through holes 17 are provided, and as shown in FIG. It is in contact with the involute curve on the inner diameter side of the wrap 2a, and at the same time it is approximately 18 in the involute curve than the through hole 17a.
It is provided at a position that is angularly advanced by 0°. Note that through hole 1
7 should be provided in contact with the fixed scroll wrap 2a in theory, but considering the actual manufacturing process, it should be provided at a position far away from the fixed scroll wrap 2a so as not to damage the fixed scroll wrap 2a. is preferable, and the present embodiment naturally includes such a case. Further, a pressure reducer 20 is provided to adjust the pressure of the medium in the sealed space 12 within the introduction pipe 18. The operation in the above configuration will be explained. When the scroll compressor 13 is operated and the movable scroll 1 is rotated relative to the fixed scroll 2 as shown in FIG. The gas flows into the condenser 14, is liquefied and condensed, and is throttled by the decompressor 15 to become a low-pressure refrigerant.The evaporator absorbs heat and evaporates in the evaporator 16, and the low-pressure gas returns to the compressor 13 through the suction pipe 19 for cooling or freezing. In this case, the pressure of the high-pressure refrigerant liquid at the outlet of the condenser 14 is adjusted by the pressure reducer 20 through the introduction pipe 18 and becomes a low-temperature refrigerant through the through hole 17a. 17b into the closed spaces 12a and 12b, respectively, and cool the refrigerant gas in the closed space 12, which has already been pressurized to an intermediate pressure, to reduce the compression work, increase the amount of compressed refrigerant, and improve the performance of the compressor 13. let or,
Since the refrigerant pressures in the closed spaces 12a and 12b are equal, the amount of low-temperature refrigerant flowing into each from the introduction pipe 18 is equal, and therefore, after the low-temperature refrigerant has flowed into the closed spaces 12a,
Since the pressures of the refrigerants in the refrigerants 12b are also equal, even when they merge with each other and communicate with the discharge hole 3, there is no mutual flow or turbulence, and there is an effect that no loss occurs. In this embodiment, a through hole 1 is provided in the end plate of the fixed scroll 2 to introduce the refrigerant liquid at the outlet of the condenser 14 into the scroll compressor.
7 is provided, however, it is also conceivable to introduce the refrigerant liquid into the closed space 12 from the end plate side of the movable scroll 1. As mentioned above, the refrigeration system of this embodiment has a through hole on the end plate side of the fixed scroll, so that the refrigerant liquid can be easily and inexpensively introduced into the cylinder in the compressor, and once inside the compressor, the refrigerant liquid can be introduced into the cylinder at an intermediate pressure. It cools the high-temperature refrigerant gas that has been pressurized to reduce the compression work and increases the discharge amount of refrigerant.
In order to improve the performance of the compressor, or to provide an even number of through holes, the low temperature refrigerant is introduced into the same pair of refrigerant pressures in the closed space cylinder, so it is possible to select almost the same amount of introduction. , the torque balance is good, and even after an even number of sealed spaces merge, the refrigerant pressure is almost the same, so there is no backflow or turbulence between them, so there is little loss, and by installing a pressure reducer in the inlet pipe, the compressor The refrigerant pressure and amount of refrigerant introduced into the sealed space can be adjusted, and when the compressor is stopped, the refrigerant flows from the cylinder sealed space to the inlet pipe side, so the refrigerant pressure is balanced smoothly.
There is no excessive load upon restart. As is clear from the detailed description of the invention, according to the present invention, the refrigerant pressure in each sealed space having a pair of through holes can always be made equal, so that no extra torque is applied to the rotation prevention mechanism of the movable scroll. This will not cause any additional compression or deterioration of compression performance.

[Brief explanation of the drawing]

Fig. 1 is a refrigerant circuit diagram of a refrigeration system according to an embodiment of the present invention, Fig. 2 is a sectional view of main parts in the same embodiment, Fig. 3 is a diagram explaining the operating principle of a scroll compressor, and Fig. 4 is a diagram illustrating the operating principle of a scroll compressor. 5 and 6 are sectional views of main parts of a conventional scroll compressor having through holes, respectively. 1...Movable scroll, 1a...Movable scroll wrap, 2...Fixed scroll, 2
a...Fixed scroll wrap, 3...
Discharge hole, 9... Rotation prevention mechanism, 12...
・Closed space, 17a, 17b...Through hole, 18
...Introduction pipe, 20 ...Reducer. Name of agent: Patent attorney Shigetaka Awano Idiot 1 Is 2
Fig. Shift angle 01 Crank angle 1B0° Fig. 5 Crank angle A 80' Fig. 6 J, Graph 2 Angle O. Crank angle 480゛

Claims (1)

[Claims] A fixed scroll and a movable scroll, each having a spiral curved wrap formed on the end plate, are engaged with each other with the wraps inside, and the movable scroll is rotated relative to the fixed scroll, thereby increasing the pressure in the hermetic space closed by the scroll wraps. In a scroll compressor, an even number of through holes are provided in the end plate of the fixed scroll or the movable scroll, half of the through holes are in contact with the outer diameter side of the fixed scroll wrap, and the remaining half of the through holes are in contact with the outer diameter side of the fixed scroll wrap. The through hole in contact with the inner diameter side is in contact with the inner diameter side, and the helical curve is approximately at an angle of 180 degrees with respect to the through hole in contact with the outer diameter side with respect to the center of the end plate of the fixed scroll.
Refrigeration equipment installed at an advanced position.