JP3979407B2 - Rotary compressor - Google Patents

Description

  The present invention relates to a rotary compressor having an injection structure for injecting gas into a cylinder chamber and having two cylinder chambers via a middle plate.

Conventionally, a rotary compressor 230 as shown in FIG. 14 that includes a motor having a crankshaft in a hermetic casing and a compression element that is driven by the crankshaft and compresses refrigerant has been used for air conditioning and the like. Yes.
The compression element of the rotary compressor 230 includes a cylinder 150 having a cylindrical opening through which the crankshaft 120 passes, and a front head 130 and a rear head 140 that close the opening of the cylinder 150 from above and below. The space surrounded by the inner peripheral side wall of the opening of the cylinder 150, the front head 130, and the rear head 140 constitutes a cylinder chamber in which refrigerant is compressed.

  In addition, the crankshaft 120 is formed with a piston portion 180 that rotates inside the cylinder chamber in an eccentric manner with respect to the axis of the crankshaft 120, and the piston portion 180 is in contact with the outer peripheral surface of the inner wall of the cylinder 150. A cylindrical roller 190 that revolves along is provided. The refrigerant is fed into the cylinder chamber through a suction pipe 160 connected to the cylinder 150. Further, an injection pipe 170 is connected to the side surface of the cylinder chamber 150. From the injection pipe 170, an injection passage 171 provided in the cylinder 150 and the rear head 140, and an injection port 172 opening from the rear head 140 to the cylinder chamber are provided. The refrigerant gas separated from the gas and liquid in the refrigeration cycle is injected into the cylinder chamber.

  In the compressor 230, as described above, the refrigerant capacity in the refrigeration cycle is injected into the cylinder chamber via the injection passage 171 and the injection port 172, thereby improving the refrigeration capacity. That is, in this method, as schematically shown in FIG. 13, gas-liquid separation having two expansion mechanisms provided in a pipe that sends refrigerant gas compressed in the refrigeration cycle from the condenser 210 to the evaporator 205. An intermediate pressure is generated in the machine 220 to separate the refrigerant into a liquid and a gas, and then the separated refrigerant gas is injected into the cylinder chamber of the compressor 230 to increase the refrigeration capacity. The refrigerating capacity is made variable by adjusting the amount of refrigerant gas injected.

  In the one-cylinder rotary compressor 230 shown in FIG. 14 that employs such a variable refrigeration capacity system, the refrigerant gas that normally circulates in the refrigeration cycle flows from the suction pipe 160 into the cylinder chamber, but the gas-liquid separator When the valve between 220 and the injection pipe 170 is opened, the refrigerant gas is also injected from the injection pipe 170 into the cylinder chamber. At this time, since the refrigerant gas is injected into the cylinder chamber only when the end surface 191 of the roller 190 in the cylinder chamber is not in the position where the injection port 172 is blocked, the end surface 191 of the roller 190 periodically opens the opening of the injection port 172. Using the opening and closing, ON / OFF control of the inflow of refrigerant gas is performed.

  Next, a description will be given of a conventional structure when the above-described method for changing the refrigeration capacity is applied to a two-cylinder rotary compressor 240 as shown in FIG. A conventional two-cylinder rotary compressor 240 includes a middle plate 200, upper and lower cylinders 155 and 150, which sandwich the middle plate 200 from above and below, and each have a cylindrical opening, as compression elements of the rotary compressor. A front head 130 that closes the opening of the cylinder 155 from above and a rear head 140 that closes the opening of the lower cylinder 150 from below are provided. Openings of the upper and lower cylinders 155 and 150 positioned above and below via the middle plate 200 constitute upper and lower cylinder chambers 355 and 450, respectively.

  The upper and lower cylinder chambers 355 and 450 are provided with upper and lower piston portions 185 and 180 that rotate integrally with the crankshaft 120, and the outer periphery of the upper and lower piston portions 185 and 180 is rotatable around the upper and lower piston portions 185 and 180. In addition, upper and lower rollers 195 and 190 that revolve along the inner walls of the upper and lower cylinders 155 and 150 are provided. The upper and lower cylinders 155 and 150 are connected to suction pipes 165 and 160 for sucking refrigerant gas that normally circulates in the refrigeration cycle into the two-cylinder rotary compressor 240, respectively.

The front head 130 and the rear head 140 are connected to injection pipes 175 and 170, and are provided with injection passages 176 and 171 and injection ports 177 and 172 so as to communicate with the injection pipes 175 and 170, respectively. The refrigerant gas that has been gas-liquid separated during the refrigeration cycle is injected into the cylinder chamber.
Japanese Utility Model Publication No. 56-004877 Japanese Patent Laid-Open No. 07-127575 Japanese Patent Laid-Open No. 02-275991 JP 09-158874 A

  However, the conventional two-cylinder rotary compressor 240 having the above structure is positioned relative to the rollers 195 and 190 in order to inject the refrigerant gas into the upper and lower cylinder chambers 350 and 455, respectively. Injection ports 177 and 172 need to be provided on both the front head 130 and the rear head 140. Accordingly, the injection passages 176 and 171 and the injection pipes 175 and 170 need to be provided in both the front head 130 and the rear head 140. Therefore, the two-cylinder rotary compressor 240 has a problem that the number of parts is doubled as compared with the one-cylinder rotary compressor 230.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to inject refrigerant gas into the upper and lower cylinder chambers of a two-cylinder rotary compressor with a single injection pipe.

  A rotary compressor according to a first aspect of the present invention includes an electric element having a rotary drive shaft in a hermetic casing, and a rotary compression element that is driven by the rotary drive shaft and compresses the refrigerant gas. The rotary compression element has a hole through which the rotary drive shaft passes, and a middle plate arranged perpendicular to the central axis of the rotary drive shaft, and the middle plate from both sides in the central axis direction of the rotary drive shaft. It includes first and second cylinder chambers that constitute a refrigerant gas compression chamber provided at a sandwiched position. Further, the middle plate is connected to an injection pipe introduced from the outside of the hermetic casing, and is coupled to the injection pipe and is branched to communicate with each of the first and second cylinder chambers. A passage is provided. Through the injection pipe and the refrigerant gas passage, the refrigerant gas separated from the gas and liquid in the refrigeration cycle can be injected into the first and second cylinder chambers.

  By adopting such a structure, the refrigerant gas passage branched from one injection pipe provided in the middle plate communicates with the first cylinder chamber and the second cylinder chamber. The number of parts can be reduced as compared with the case where the injection pipe and the refrigerant gas passage are separately provided in the two cylinder chambers.

  Since the middle plate has the refrigerant gas passage, a positioning jig is inserted into each of the refrigerant gas passage and the regular refrigerant gas suction pipes provided in the first and second cylinders. By moving in a direction substantially perpendicular to the rotation drive shaft, it becomes easy to determine the relative positions of the middle plate and the upper and lower cylinders.

  In the rotary compressor according to the first aspect of the present invention, the rotary compression elements are shifted in phase with each other along with the rotation of the rotary drive shaft along the inner walls of the first and second cylinder chambers. The first and second rollers that revolve are further included, and the first and second rollers are opened so that at least one of the opening to the first cylinder chamber and the opening to the second cylinder chamber is closed. The position and size of the refrigerant gas passage opening facing the second cylinder chamber are set.

  With such a structure, since at least one of the opening to the first cylinder chamber and the opening to the second cylinder chamber of the refrigerant gas passage is closed, the gas in the first cylinder chamber and the second cylinder Mixing with indoor gas is prevented. Therefore, it is possible to maintain the gas pressures in the first cylinder chamber and the second cylinder chamber at a predetermined value. Thereby, since it becomes possible to send out the refrigerant having a predetermined gas pressure, a predetermined refrigerating capacity is exhibited even when the injection pipe and the refrigerant gas passage are provided only in the middle plate.

  Furthermore, in the rotary compressor according to the first aspect of the present invention, the first roller and the second roller simultaneously block the opening of the refrigerant gas passage to the first cylinder chamber and the opening to the second cylinder chamber, respectively. The position and size of the opening of the refrigerant gas passage are set so that the rotation angle of the rotary drive shaft is at least 5 degrees or more.

  With such a structure, the revolution angle of the drive shaft shaft is such that the first and second rollers simultaneously block the opening of the refrigerant gas passage to the first cylinder chamber and the opening to the second cylinder chamber. Therefore, the opening of one of the refrigerant gas passages is reliably closed. As a result, mixing of the gas in the first cylinder chamber and the gas in the second cylinder chamber is more reliably prevented.

  In the rotary compressor according to the second aspect of the present invention, the first and second rollers revolve in the first and second cylinder chambers in a state where the phases are shifted by 180 degrees.

  With such a structure, the first roller and the second roller revolve in the first and second cylinder chambers in a state where the phases are shifted by 180 degrees, so that the first cylinder chamber and the second cylinder chamber The refrigerant gas can be supplied alternately at regular intervals. Thereby, the rotary compressor can efficiently exhibit a desired refrigeration capacity.

  According to the rotary compressor of the present invention as set forth in claim 1, the number of parts is reduced in the two-cylinder type rotary compressor as compared with the case where the injection pipe is provided in each of the upper cylinder chamber and the lower cylinder chamber. be able to. In the two-cylinder rotary compressor, the gas pressure in the upper cylinder chamber and the lower cylinder chamber is maintained at a predetermined value. Therefore, even when the injection pipe is provided only on the middle plate, the desired performance is exhibited. The Further, since the rotation angle of the crankshaft that simultaneously closes the opening to the upper cylinder chamber and the opening to the lower cylinder chamber is at least 5 degrees or more, the refrigerant is transferred from the injection pipe provided only in the middle plate to the upper and lower cylinder chambers. Even when the gas is supplied, mixing of the gas in the upper cylinder chamber and the gas in the lower cylinder chamber is more reliably prevented.

  According to the rotary compressor of the present invention described in claim 2, in the two-cylinder rotary compressor, the refrigerant gas is alternately supplied to the upper cylinder chamber and the lower cylinder chamber at equal intervals. Is effectively exhibited.

  Hereinafter, a rotary compressor according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the rotary compressor 300 of the present embodiment includes a middle plate 100 as a compression element of the rotary compressor, and upper and lower cylinders that sandwich the middle plate 100 from above and below and each have a cylindrical opening. 55, 50, a front head 30 that closes the opening of the upper cylinder 55 from above, and a rear head 40 that closes the opening of the lower cylinder 50 from below. Openings of the upper and lower cylinders 55 and 50 positioned above and below via the middle plate 100 constitute upper and lower cylinder chambers 355 and 450, respectively.

Further, inside the upper and lower cylinder chambers 355 and 450 are provided upper and lower piston portions 85 and 80 that rotate integrally with the crankshaft 20 that is a rotation drive shaft. Upper and lower rollers 95 and 90 that revolve along the inner walls of the upper and lower cylinders 55 and 50 are provided so as to be rotatable around. The upper and lower cylinders 55 and 50 are connected to suction pipes 65 and 60 for sucking refrigerant gas that normally circulates in the refrigeration cycle into the rotary compressor 300, respectively. Further, the state viewed from the front head 30 side and the rear head 40 side is as shown in the partial cross-sectional views viewed in accordance with arrows B and C in FIGS. 2 and 3.
An injection pipe 70 is connected to the middle plate 100, and an injection passage 71 and an injection port 72 are provided so as to communicate with the injection pipe 70. Through these, a gas-liquid separation is performed during the refrigeration cycle. The refrigerant gas thus injected is injected into the cylinder chambers 355 and 450.

  By adopting the above-described structure, the two-cylinder rotary compressor 300 of the present embodiment has the upper cylinder chamber 355 and the lower cylinder chamber in which the injection port 72 branched from one injection pipe 70 through the injection passage 71. Since it communicates with 450, the number of parts can be reduced as compared with the case where an injection pipe is provided in each of the upper cylinder chamber 355 and the lower cylinder chamber 450.

  However, in the two-cylinder rotary compressor 300 having the above structure, when the upper cylinder 355 and the lower cylinder chamber 450 communicate with each other in the revolving movement state of the upper and lower rollers 95 and 90 in the compression cycle, Refrigerant gases having different pressures are mixed. As a result, the refrigerant gas is not compressed as much as necessary, and the capacity of the refrigerator may be reduced, and the over-compressed refrigerant gas may flow back from the injection port 72 through the injection passage 71 to the injection pipe 70.

  Therefore, in the rotary compressor 300 according to the present embodiment, the upper roller 95 and the lower roller 90 revolve in the upper cylinder chamber 355 and the lower cylinder chamber 450 with their phases shifted by 180 degrees. Is provided. Further, the position and size of the opening of the injection port 72 are closed such that at least one of the openings to the upper cylinder chamber 355 and the lower cylinder chamber 450 of the branched injection port 72 is closed by the upper roller 95 and the lower roller 90. Is set.

  As described above, at least one of the opening to the upper cylinder chamber 355 and the opening to the lower cylinder chamber 450 of the injection port 72 is closed by the upper roller 95 or the lower roller 90, thereby the refrigerant in the upper cylinder chamber 355. Mixing of the gas and the refrigerant gas in the lower cylinder chamber 450 is prevented. Therefore, the different gas pressures of the refrigerant gas in the upper cylinder chamber 355 and the lower cylinder chamber 450 are held at predetermined values. As a result, even in the two-cylinder rotary compressor 300 of the present embodiment in which the injection pipe 70 is provided only on the middle plate 100, a predetermined capacity is ensured.

  Further, when the upper roller 95 and the lower roller 90 revolve with the phase shifted by 180 degrees, the refrigerant gas is alternately supplied to the upper cylinder chamber 355 and the lower cylinder chamber 450 at equal intervals. As a result, each of the refrigerant gas delivered from the upper and lower cylinder chambers 355 and 450 is held at a predetermined gas pressure and discharged at equal intervals, so that the two-cylinder rotary compressor 300 functions efficiently. be able to.

  At this time, the injection port 72 is configured to prevent the refrigerant gas in the upper cylinder chamber 355 and the refrigerant gas in the lower cylinder chamber 450 from being mixed more reliably. The rotation angle of the crankshaft 120 that simultaneously closes the opening to the upper cylinder chamber 355 and the opening to the lower cylinder chamber 450 is provided so as to be at least 5 degrees or more.

  Next, means for positioning the middle plate 100 and the upper and lower cylinders 55 and 50 of the rotary compressor 300 according to the present embodiment will be described.

  As shown in FIGS. 4 and 5, the two-cylinder rotary compressor 300 of the present embodiment is configured so that the relative positions of the middle plate 100 and the upper cylinder 55 or the middle plate 100 and the lower cylinder 50 are set. The positioning pin hole 101 provided in the middle plate 100 and the positioning pin hole 58 or the positioning pin hole 53 of the same diameter provided in any one of the upper and lower cylinders 55 and 50, the upper cylinder 55 and the middle plate 100 are determined. Or the positioning pin 1 fitted in close contact with the positioning pin holes 58 and 101 or the positioning pin holes 53 and 101 in a state where the lower cylinder 50 and the middle plate 100 are fixed. Yes.

  Furthermore, the middle plate 100 and the upper cylinder 55 and the lower cylinder 50 of the rotary compressor 300 according to the present embodiment are provided on the upper cylinder 55, the middle plate 100, and the lower cylinder 50, respectively, as shown in FIGS. And a plurality of other bolts 57a, 102a, 52a having the same diameter and smaller diameter than the bolt insertion holes 57, 100, 52. The positioning bolt insertion holes 57a, 102a, 52a and the bolt insertion holes 57, 102, 52 are provided so that the positioning bolt 2a and the bolt 2 having the same diameter as the positioning bolt 2a are fitted therein.

  In the case of a two-cylinder type such as the rotary compressor 300 of the present embodiment as described above, in order to more reliably prevent the gas in the cylinder chamber 355 and the gas in the lower cylinder chamber 450 from mixing. The cylinders 55 and 50 need to be accurately positioned with respect to the middle plate 100, and the positions of the injection port 72 with respect to the upper and lower rollers 95 and 90 need to be accurately fixed. Therefore, the relative position between the middle plate 100 and the upper and lower cylinders 55, 50 is determined using the positioning pin 1 or the positioning bolt 2a. When positioning using the positioning bolt 2a, two or more positioning positions are determined. If the bolt insertion hole is designed to be in close contact with the positioning bolt 2a, the positioning bolt cannot be inserted due to the formation error of the positioning bolt insertion hole, and the middle plate 100 and the upper and lower cylinders 55, 50 cannot be fixed. Arise.

Accordingly, in the rotary compressor 300 of the present embodiment, only one positioning bolt insertion hole 52a, 102a, 57a is made smaller than the other bolt insertion holes 52, 102, 57, thereby forming a bolt insertion hole formation error. Thus, it is possible to suppress an inconvenient phenomenon that the middle plate 100 and the upper and lower cylinders 55 and 50 cannot be fixed. Further, as shown in FIGS. 4 and 5, the positioning jigs 3, 4 are inserted into the injection pipe 70 and the cylinder suction lateral holes 56, 51 and operated in a substantially vertical direction with respect to the crankshaft 20. The relative positions of the plate 100 and the upper and lower cylinders 55 and 50 are easily adjusted.
The effect produced by setting the injection port 72 to the optimum position by using the above-described structure will be described with reference to FIGS.

  FIGS. 6 to 11 show the inside of the upper and lower cylinders 55 and 50 by the rotation of the upper and lower piston portions 85 and 80 using the rotational motion of the vertical swing bushes 98 and 93 and the reciprocating motion of the upper and lower blade portions 97 and 92. The state in which the upper and lower rollers 95 and 90 revolve along the peripheral side surface is shown at a predetermined position. In this case, the upper piston portion 85 in the upper cylinder 55 and the lower piston portion 80 in the lower cylinder 50 are fixed with a phase shifted by 180 degrees. Here, a position where the upper swinging bush 98 is located is defined as a top dead center, and a state where the eccentric direction of the upper piston portion 85 with respect to the crankshaft 20 is located at the top dead center is defined as a rotation angle of 0 degree.

  6 and 7 are cross-sectional views showing the inside of each of the upper and lower cylinders 55 and 50 when the rotation angle in the eccentric direction of the piston portion 85 with respect to the crankshaft 20 from the top dead center is 60 degrees with the upper cylinder 55 as a reference. FIG. 8 and FIG. 9 show the inner positions of the upper and lower cylinders 55 and 50 when the rotation angle of the upper piston portion 85 with respect to the crankshaft 20 from the top dead center in the eccentric direction is 175 degrees with reference to the upper cylinder 55. FIG. 10 and 11 show the inside of each of the upper and lower cylinders 55 and 50 when the rotation angle in the eccentric direction of the upper piston portion 85 from the top dead center with respect to the crankshaft 20 is 240 degrees with reference to the upper cylinder 55. It is sectional drawing shown.

6 and 7, the end surface 96 of the upper roller 95 in the upper cylinder 55 does not block the opening of the injection port 72, and the end surface 91 of the lower roller 90 in the lower cylinder 50 does not close the injection port. The 72 opening is closed. Thereby, the refrigerant gas is supplied into the upper cylinder 55 from the opening of the injection port 72, and the refrigerant gas is not supplied into the lower cylinder 50 from the opening of the injection port 72.
8 and 9, the end surface 96 of the upper roller 95 in the upper cylinder 55 closes the opening of the injection port 72, and the end surface 91 of the lower roller 90 in the lower cylinder 50 also functions as the injection port. The 72 opening is closed. Thereby, refrigerant gas is not supplied from the injection port 72 into the upper cylinder 55, and refrigerant gas is not supplied from the opening of the injection port 72 into the lower cylinder 50.

  10 and FIG. 11, the end surface 96 of the upper roller 95 in the upper cylinder 55 closes the opening of the injection port 72, and the end surface 91 of the lower roller 90 in the lower cylinder 50 is the injection port. 72 openings are not blocked. Thereby, the refrigerant gas is not supplied into the upper cylinder 55 from the opening of the injection port 72, and the refrigerant gas is supplied into the lower cylinder 50 from the opening of the injection port 72.

  The relationship between the opening and closing of the opening of the injection port 72 due to the revolution of the series of upper and lower rollers 95 and 90 and the rotation angle of the upper and lower piston portions 85 and 80 with respect to the crankshaft 20 as shown in FIGS. It is shown in FIG. The line 5 in the graph of FIG. 12 shows the opening / closing operation of the opening of the injection port 72 to the upper cylinder chamber 355, and the dotted line 6 shows the opening / closing operation of the opening of the injection port 72 to the lower cylinder chamber 450. Accordingly, it can be seen that the opening of the injection port 72 to both the upper and lower cylinder chambers 355 and 450 is closed between the rotation angles of 160 to 170 degrees and 340 to 350 degrees.

  Accordingly, the upper and lower rollers 85 and 80 revolve so that the upper and lower cylinder chambers 355 and 450 do not communicate with each other, so that the gases in the upper and lower cylinder chambers 355 and 450 are prevented from being mixed. Thereby, the low capacity | capacitance of the compressor which arises because refrigerant gas is not compressed to the required extent is suppressed. Further, the overcompressed refrigerant gas is prevented from flowing backward from the injection port 72 through the injection passage 71 to the injection pipe 70. As a result, even if the injection port 72 is branched from the middle plate 100 and gas is supplied to the upper and lower cylinder chambers 355 and 450, the refrigerant gas delivered from the cylinder chambers 355 and 450 has a predetermined gas pressure. The rotary compressor 300 according to the embodiment exhibits a desired capability.

  It should be understood that the embodiment disclosed this time is illustrative in all respects and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a fragmentary sectional view showing a 2 cylinder type rotary compressor of one embodiment of the present invention. FIG. 2 is a partial cross-sectional view of the two-cylinder rotary compressor shown in FIG. 1 as viewed along arrow B in FIG. 1. FIG. 2 is a partial cross-sectional view of the two-cylinder rotary compressor shown in FIG. 1 as viewed along arrow C in FIG. 1. It is a top view of the middle plate in one embodiment of the present invention. It is sectional drawing which shows the positional relationship of an up-and-down roller and an up-and-down piston part in case an up-and-down cylinder and a crankshaft in one embodiment of this invention have a predetermined | prescribed rotation angle. In the embodiment of the present invention, when the rotation angle of the upper piston portion in the upper cylinder in the eccentric direction with respect to the crankshaft is 60 degrees from the top dead center, the upper roller in the upper cylinder moves to the upper cylinder chamber of the injection port. It is sectional drawing which shows the state which opened the opening. In the embodiment of the present invention, when the rotation angle of the upper piston portion in the upper cylinder in the eccentric direction with respect to the crankshaft is 60 degrees from the top dead center, the lower roller in the lower cylinder moves to the lower cylinder chamber of the injection port. It is sectional drawing which shows the state which closed the opening. In the embodiment of the present invention, when the rotation angle of the upper piston portion in the upper cylinder in the eccentric direction with respect to the crankshaft is 175 degrees from the top dead center, the upper roller in the upper cylinder moves to the upper cylinder chamber of the injection port. It is sectional drawing which shows the state which closed the opening. In an embodiment of the present invention, when the rotation angle of the upper piston portion in the upper cylinder in the eccentric direction with respect to the crankshaft is 175 degrees from the top dead center, the lower roller in the lower cylinder moves to the lower cylinder chamber of the injection port. It is sectional drawing which shows the state which closed the opening. In the embodiment of the present invention, when the rotation angle of the upper piston portion in the upper cylinder in the eccentric direction with respect to the crankshaft is 240 degrees from the top dead center, the upper roller in the upper cylinder moves to the upper cylinder chamber of the injection port. It is sectional drawing which shows the state which closed the opening. In an embodiment of the present invention, when the rotation angle of the upper piston portion in the upper cylinder in the eccentric direction with respect to the crankshaft is 240 degrees from the top dead center, the lower roller in the lower cylinder moves to the lower cylinder chamber of the injection port. It is sectional drawing which shows the state which opened the opening. The rotation angle from the top dead center in the eccentric direction with respect to the crankshaft of the upper piston portion in the upper cylinder in one embodiment of the present invention, and the respective open / close states of the upper and lower openings of the injection port by the upper and lower rollers in the upper and lower cylinders It is a figure showing the graph shown. It is the schematic diagram which showed the cycle in which the gas isolate | separated with the gas-liquid separator is sent to the conventional compressor. It is sectional drawing which shows the compressor of the conventional 1 cylinder type rotary. It is sectional drawing which shows the state by which the injection pipe was provided in each upper and lower cylinder of the compressor of the conventional 2 cylinder type rotary.

Explanation of symbols

  1 Positioning Pin, 2 Bolt, 2a Positioning Bolt, 3, 4 Positioning Jig, 5 Wire, 6 Dotted Line, 10 Rotor, 20 Crankshaft, 30 Front Head, 40 Rear Head, 50 Lower Cylinder, 55 Upper Cylinder, 51, 56 Cylinder suction lateral hole, 52, 57, 102 Positioning bolt insertion hole, 53, 58, 101 Positioning pin hole, 60, 65 Suction pipe, 70 Injection pipe, 71 Injection passage, 72 Injection port, 80 Lower piston part, 85 Upper piston part , 90 Lower roller, 95 Upper roller, 91, 96 End face, 92 Lower blade part, 97 Upper blade part, 93 Lower swing bush, 98 Upper swing bush, 100 Middle plate.

Claims (2)

An electric element having a rotary drive shaft (20) in a hermetic casing, and a rotary compression element that is driven by the rotary drive shaft (20) and compresses the refrigerant gas;
The rotary compression element is
A middle plate (100) having a hole through which the rotational drive shaft (20) passes, and being arranged perpendicular to the central axis of the rotational drive shaft (20);
First and second cylinder chambers (355, 450) constituting refrigerant gas compression chambers provided at positions sandwiching the middle plate (100) from both sides in the central axis direction of the rotation drive shaft (20). ,
The middle plate (100) is connected to an injection pipe (70) introduced from the outside of the hermetic casing, is connected to the injection pipe (70), and is connected to the first and second cylinder chambers ( 355, 450) is provided with refrigerant gas passages (71, 72) branched so as to communicate with each of them,
Through the injection pipe (70) and the refrigerant gas passages (71, 72), it is possible to inject refrigerant gas separated into gas and liquid in the refrigeration cycle into the first and second cylinder chambers (355, 450). Yes,
The first and second rotary compression elements revolve along the inner walls of the first and second cylinder chambers (355, 450) with the rotation of the rotary drive shaft (20) out of phase with each other. A second roller (95, 90);
Maintaining at least one of the opening to the first cylinder chamber (355) and the opening to the second cylinder chamber (450) of the refrigerant gas passage (71, 72), and The opening of the refrigerant gas passages (71, 72) to the first cylinder chamber (355) and the opening to the second cylinder chamber (450) are arranged so that the first roller (95) and the second roller (90 ), The position and size of the opening of the refrigerant gas passage (71, 72) are set so that the rotation angle of the rotary drive shaft (20) is at least 5 degrees or more. .   2. The rotary compression according to claim 1, wherein the first and second rollers (95, 90) revolve in the first and second cylinder chambers (355, 450), respectively, with a phase being shifted by 180 degrees. Machine.

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