JP6955087B2 - Rotary compressor - Google Patents

Description

The present invention relates to a rotary compressor that compresses a refrigerant used in a refrigerant circuit of a refrigeration cycle device such as an air conditioner.

A conventional rotary compressor includes an electric motor and a compression mechanism driven by the electric motor in a container. The compression mechanism comprises a cylindrical cylinder, a rolling piston mounted on an eccentric portion of the rotating shaft of the motor to perform eccentric movement in the cylinder, and a vane that divides the space inside the cylinder into a suction chamber and a compression chamber. I have. A suction hole and a discharge port are formed in the cylinder, and the refrigerant sucked into the suction chamber from the outside of the container through the suction pipe and the suction hole is compressed and compressed with the eccentric movement of the rolling piston. The refrigerant is discharged from the compression chamber to the outside of the compression mechanism via the discharge port. A lubrication passage is formed in the rotation shaft in the axial direction, and the lubricating oil stored in the container is supplied to the compression mechanism through the lubrication passage during operation to lubricate the compression mechanism.

In the rotary compressor, the rotating shaft rotates in the positive direction during operation, so that the refrigerant is sucked into the suction chamber of the cylinder chamber via the suction pipe, and the sucked refrigerant is compressed and compressed in the compression chamber of the cylinder chamber. The chamber is under higher pressure than the suction chamber. Immediately after the operation is stopped, the pressure in the compression chamber is higher than that in the suction chamber, so that the refrigerant flows from the compression chamber to the suction chamber due to the pressure difference, so that the rotating shaft rotates in the reverse direction. When such reverse rotation continues, the lubricating oil accumulated at the bottom of the container passes through the oil supply path of the rotating shaft, flows back from the compression mechanism through the suction chamber to the suction pipe together with the refrigerant, and passes through the suction pipe to the container. It leaks to the outside. If the lubricating oil flows out of the container, the lubricating oil in the container will be insufficient at the next start-up.

Therefore, there is known one provided with a suction check valve in the flow path connecting the suction pipe to the suction chamber (see, for example, Patent Document 1). The suction check valve opens when the pressure on the suction pipe side exceeds a preset pressure with respect to the pressure on the suction chamber side, and closes when the pressure does not exceed the set pressure. As a result, the suction check valve allows the refrigerant gas to flow from the suction pipe to the suction chamber, while preventing the refrigerant from flowing back from the suction chamber to the suction pipe.

Japanese Unexamined Patent Publication No. 2016-102438

The flow path configuration for connecting the suction pipe to the suction chamber includes a configuration in which the suction chamber is located in a direction bent perpendicular to the connection direction of the suction pipe to the container as in Patent Document 1, and a container for the suction pipe. There is also a rotary compressor in which the suction chamber is located on the extension of the connection direction to. In the configuration of Patent Document 1, a suction check valve is arranged on the wall surface of the curved portion of the flow path, but in the latter configuration, a technique of providing a suction check valve in the flow path from the suction pipe to the suction chamber is found. No. For this reason, in a rotary compressor having a structure in which the suction chamber is located on the extension of the suction pipe in the connection direction to the container, the reverse rotation of the rotating shaft when the operation is stopped is suppressed, and the lubricating oil flows out of the container. There was a problem that it was difficult to suppress.

The present invention has been made to solve the above problems, and in a rotary compressor having a cylinder chamber formed on an extension of the connection direction of the suction pipe, the reverse rotation of the rotating shaft when the operation is stopped It is an object of the present invention to provide a rotary compressor capable of suppressing the outflow of lubricating oil to the outside of a container.

The rotary compressor according to the present invention includes a container in which lubricating oil is stored, a suction pipe that penetrates the container and is connected from the outside, a rotary shaft that is housed in the container and has a refueling passage formed therein, and the inside of the container. It is a rotary compressor that is housed in a rotary compressor and has a compression mechanism that compresses the refrigerant by the rotation of the rotary shaft, and lubricating oil is supplied to the compression mechanism via a lubrication passage. The compression mechanism is passed through the rotary shaft. A cylinder having a through hole, a piston provided on the outer periphery of the rotating shaft and rotating eccentrically inside the through hole, and two closing members arranged vertically above and below the cylinder are provided. By closing the through hole with two closing members, a cylinder chamber is formed in which the refrigerant sucked into the container from the suction pipe is sucked and compressed, and the cylinder opens on the outer periphery of the cylinder in the radial direction. A suction hole composed of a blind hole extending to is formed, a suction pipe is connected to the opening side of the suction hole, and a cylinder chamber is formed on an extension line in the connection direction of the suction pipe. A suction check valve that allows the flow of refrigerant from the suction pipe to the suction chamber in the cylinder chamber and prevents this reverse flow is arranged in the hole, and the refrigerant from the suction pipe is opened when the suction check valve is open. A suction flow path is formed via one or both of the two closing members, and the suction flow path is formed with a flow path hole formed in the cylinder communicating with the suction hole and a flow path hole. One or both of the two closing members arranged above and below the axial direction of the cylinder are formed on the surface on the suction check valve side and are composed of a flow path hole and a flow path recess that communicates with the suction chamber. The suction check valve includes a valve body that opens and closes the opening of the suction pipe by moving inside the suction hole, and a spring that urges the valve body in the direction of closing the opening of the suction pipe. When the check valve is open, the valve body is located radially inside the flow path hole to form a suction flow path, and the compression mechanism is such that the compression unit including the cylinder and piston is axially 2 In addition to the two closing members, another closing member is provided, and when one of the two compression parts is a first compression part and the other is a second compression part, the first compression is performed. The portions and the second compression portion are arranged in the axial direction, and are closed at the upper portion in the axial direction of the first compression portion, between the first compression portion and the second compression portion, and at the lower portion in the axial direction of the second compression portion. A member is arranged, and a suction check valve is arranged in a suction hole formed in one of the cylinders of the first compression part and the second compression part. Placed vertically above and below the side where the check valve is placed A suction flow path is formed in one or both of the two closed members, and a suction check valve is arranged in the suction hole of the first compression portion, and the first compression portion and the second compression portion are connected to each other. A flow path recess is formed in the intermediate partition plate which is a closing member between the spaces, and an oil escape hole is formed in the intermediate partition plate for communicating the flow path recess of the intermediate partition plate and the suction chamber of the second compression portion. It is a thing.

According to the present invention, a suction check valve is arranged in a suction hole formed by a blind hole that opens on the outer periphery of the cylinder and extends in the radial direction, and two suction flow paths are blocked when the suction check valve is open. By securing via one or both of the members, it is possible to install and operate the suction check valve in a configuration in which the cylinder chamber is formed on the extension line in the connection direction of the suction pipe. By installing the suction check valve, it is possible to suppress the reverse rotation of the rotating shaft when the operation is stopped and suppress the outflow of the lubricating oil to the outside of the container.

It is a schematic vertical sectional view of the rotary compressor which concerns on Embodiment 1 of this invention. It is a perspective view of the cylinder of FIG. It is an enlarged sectional view of the cylinder of FIG. It is a perspective view of the 1st support member of FIG. It is a perspective view of the intermediate partition plate of FIG. It is an enlarged view of the peripheral structure of a suction check valve surrounded by a dotted line in FIG. It is an exploded perspective view of the suction check valve of FIG. FIG. 1 is an enlarged view of the peripheral structure of the suction check valve surrounded by a dotted line in FIG. 1, showing a state in which the suction check valve is closed. It is a figure which shows the modification of the pressure balance hole in the rotary compressor which concerns on Embodiment 1 of this invention. It is a figure which shows the modification of the installation position of the suction check valve in the rotary compressor which concerns on Embodiment 1 of this invention, and is the figure which shows the state which the suction check valve is open. It is a figure which shows the modification of the installation position of the suction check valve in the rotary compressor which concerns on Embodiment 1 of this invention, and is the figure which shows the state which the suction check valve is closed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each figure, the same or corresponding parts are designated by the same reference numerals, and the description thereof will be omitted or simplified as appropriate. In addition, the shape, size, arrangement, etc. of the configurations shown in each figure can be appropriately changed within the scope of the present invention.

Embodiment 1.
FIG. 1 is a schematic vertical sectional view of the rotary compressor according to the first embodiment of the present invention. FIG. 2 is a perspective view of the cylinder of FIG. In FIG. 2, the vane 39 and the rolling piston 32 are shown by dotted lines in order to show the suction chamber 33a and the compression chamber 33b formed in the cylinder chamber 33 in the cylinder 31. FIG. 3 is an enlarged cross-sectional view of the cylinder of FIG. FIG. 4 is a perspective view of the first support member of FIG. FIG. 5 is a perspective view of the intermediate partition plate of FIG. The figure shows a two-cylinder rotary compressor provided with two cylinders 31, but the rotary compressor of the present invention is not limited to a two-cylinder one, and may be a one-cylinder one or a plurality of cylinders. It may be the one.

In the rotary compressor 100, the electric motor 2 and the compression mechanism 3 driven by the electric motor 2 via the rotating shaft 4 are housed in the container 1.

The container 1 is connected to a suction pipe 5 that penetrates the container 1 and is connected from the outside, and a discharge pipe 6 for discharging compressed gas. The bottom of the container 1 is an oil sump 1a for storing lubricating oil, and the lubricating oil collected in the oil sump 1a is formed axially at the center of the rotating shaft 4 by the differential pressure acting on the oil supply passage 4A. The oil supply passage 4A is raised and supplied to the compression mechanism 3.

The electric motor 2 includes a rotor 2a attached to the rotating shaft 4 and a stator 2b that rotationally drives the rotor 2a. Then, when the energization of the stator 2b is started, the rotor 2a rotates, and the rotational power is transmitted to the compression mechanism 3 via the rotating shaft 4.

The compression mechanism 3 includes a first compression portion 30A provided at the upper portion, a second compression portion 30B provided at the lower portion, a first support member 40 arranged on the upper end surface of the first compression portion 30A, and a second compression mechanism 3. It includes a second support member 50 arranged on the lower end surface of the compression portion 30B.

The first support member 40 is composed of a hollow cylindrical bearing portion 41 that rotatably supports the rotating shaft 4, and a flat plate annular end plate portion 42 that closes the end face of the cylinder 31, which will be described later, in the upward direction. .. Similarly, the second support member 50 is also composed of a hollow cylindrical bearing portion 51 that rotatably supports the rotating shaft 4, and a flat plate annular end plate portion 52 that closes the end face of the cylinder 31, which will be described later, in the downward direction. ing. A discharge port (not shown) provided with a discharge valve is formed in each of the end plate portion 42 and the end plate portion 52.

Further, an intermediate partition plate 60 is arranged between the first compression section 30A and the second compression section 30B to partition the first compression section 30A and the second compression section 30B. As described above, the compression mechanism 3 is configured by laminating the second support member 50, the second compression portion 30B, the intermediate partition plate 60, the first compression portion 30A, and the first support member 40 from the lower side to the upper side. Has been done.

Hereinafter, the first compression unit 30A and the second compression unit 30B will be described. Since the first compression unit 30A and the second compression unit 30B have basically the same configuration, the first compression unit 30A will be described below as a representative.

The first compression portion 30A is provided on the outer periphery of the eccentric shaft portion 4a of the rotary shaft 4 and the cylindrical cylinder 31 in which the through hole 31a through which the rotary shaft 4 is passed is formed, and eccentricizes the inside of the through hole 31a. It includes a rotating rolling piston 32. The first compression unit 30A further includes a vane 39 slidably arranged in a vane groove 31b provided in the cylinder 31. The through hole 31a of the cylinder 31 is closed by the end plate portion 42 of the first support member 40 and the intermediate partition plate 60, so that the inner peripheral surface 31c of the through hole 31a in the cylinder 31 (hereinafter, the cylinder chamber 33). A cylinder chamber 33 is formed between the inner peripheral surface (referred to as 31c) and the outer peripheral surface of the rolling piston 32. The cylinder chamber 33 is divided into a suction chamber 33a and a compression chamber 33b by a vane 39.

Further, as shown in FIG. 2, the cylinder 31 is formed with a suction hole 34 which is open on the outer periphery and is composed of a blind hole extending in the radial direction, and sucks through the container 1 on the opening side of the suction hole 34. The pipe 5 is connected. Further, in the cylinder 31, a discharge notch 35 is formed on the inner peripheral surface 31c of the cylinder chamber 33. The discharge notch 35 is formed by being cut out according to the outer shape of the discharge port 42a (see FIG. 4) formed in the end plate portion 42 of the first support member 40. Then, the compression chamber 33b communicates with the discharge port 42a via the discharge notch 35.

In the first compression unit 30A configured as described above, when electric power is supplied to the electric motor 2, the rotating shaft 4 is rotated by the electric motor 2. This rotation is in the positive direction. As the rotating shaft 4 rotates, the eccentric shaft portion 4a moves eccentrically in the compression chamber 33b. With the eccentric rotational movement of the eccentric shaft portion 4a, the rolling piston 32 makes an eccentric rotational movement in the cylinder 31. Then, as the rolling piston 32 rotates, the low-pressure refrigerant is sucked into the suction chamber 33a, compressed in the compression chamber 33b to become high pressure, and discharged into the internal space of the container 1 through the discharge notch 35 and the discharge port 42a. NS.

The first point of the second compression unit 30B is that the members that close the through hole 31a formed at the substantially center of the cylinder 31 of the second compression unit 30B are the intermediate partition plate 60 and the second support member 50. It is different from the compression unit 30A. Further, regarding the arrangement of the first compression unit 30A and the second compression unit 30B, the eccentric shaft portion 4a of the first compression unit 30A and the eccentric shaft portion 4a of the second compression unit 30B are provided with a phase shift of 180 degrees. There is. Other configurations and operations of the second compression unit 30B are basically the same as those of the first compression unit 30A. The end plate portion 42 of the first support member 40, the intermediate partition plate 60, and the end plate portion 52 of the second support member 50 correspond to the closing member of the present invention.

In the first compression unit 30A and the second compression unit 30B, the rotation of the rotating shaft 4 causes the suction and compression of the refrigerant to be repeated. Then, the refrigerant gas compressed by each of the first compression unit 30A and the second compression unit 30B and discharged into the internal space of the container 1 is discharged from the discharge pipe 6 to the outside of the container 1, and the refrigerant circulates in the refrigerant circuit. do.

The rotary compressor of the first embodiment has a structure in which the cylinder chamber 33 is formed on an extension line in the connection direction of the suction pipe 5. In the first embodiment, in this configuration, a suction check valve 70 that allows the flow of the refrigerant from the suction pipe 5 to the suction chamber 33a in the cylinder chamber 33 and prevents the flow in the opposite direction is provided in the suction hole 34. The feature is that it is arranged. Then, in the first embodiment, by arranging the suction check valve 70 in the suction hole 34 of the first compression unit 30A, the eccentric shaft portion 4a of the rotating shaft 4 penetrating the cylinder chamber 33 of the first compression unit 30A In addition, a force for stopping the reverse rotation of the rotating shaft 4 is applied to suppress the reverse rotation. Hereinafter, the installation structure of the suction check valve 70, the operation of the suction check valve 70, and the like will be described.

FIG. 6 is an enlarged view of the peripheral structure of the suction check valve surrounded by a dotted line in FIG. FIG. 6 shows a state in which the suction check valve 70 is open. FIG. 7 is an exploded perspective view of the suction check valve of FIG.

The suction check valve 70 has a valve body 71 that opens and closes the opening of the suction pipe 5 by moving inside the suction hole 34 in the radial direction of the cylinder 31, and a valve body 71 that closes the opening of the suction pipe 5. It is equipped with a spring 72 to force. The elastic force of the spring 72 is such that the suction check valve 70 is opened by being pushed by the flow velocity of the suction refrigerant. As described above, the suction hole 34 is composed of a blind hole extending in the radial direction from the outer circumference of the cylinder 31, and includes an end surface 36 and a valve body 71 in the depth direction (left direction in FIG. 6) which is the bottom surface of the suction hole 34. A spring 72 is arranged between the two.

The end surface 36 of the suction hole 34 is an installation surface of the spring 72, a circular recess 36a is formed in the end surface 36, and the spring 72 is seated in the circular recess 36a to position the spring 72. Specifically, the outer peripheral portion of the radial inner end of the spring 72 is fitted to the inner peripheral surface of the circular recess 36a to fix the position of the spring 72. Further, a convex portion protruding outward in the radial direction may be provided in the central portion of the circular concave portion 36a, and the convex portion may be fitted inside the spring 72 to fix the position of the spring 72. Hereinafter, the end surface 36 is referred to as a spring installation surface 36.

The valve body 71 is formed in a tubular shape with one end closed, and the radially outer surface 71a of the closed portion comes into contact with the radially inner end surface of the suction pipe 5 to close the opening of the suction pipe 5 seal surface 71a. It has become. Hereinafter, the surface 71a is referred to as a sealing surface 71a.

Further, the cylinder 31 of the first compression unit 30A is formed with two flow path holes 80, which communicate with the suction hole 34 and penetrate in the axial direction, vertically and vertically in the axial direction. As shown in FIG. 2, the flow path hole 80 is formed in an oval shape that is long in the circumferential direction when viewed in a plane, but is not limited to this, and may be rectangular in a plan view. However, it may be circular. The flow path hole 80 is located radially outside the sealing surface 71a of the valve body 71 when the suction check valve 70 is open (see FIG. 6), and the suction refrigerant is released when the suction check valve 70 is opened. It becomes a flow path through which it passes.

Further, as shown in FIG. 6, each of the end plate portion 42 and the intermediate partition plate 60 of the first support member 40 is formed with a flow path recess 81 on the surface on the suction check valve 70 side. The flow path recess 81 of the end plate portion 42 of the first support member 40 is formed by opening to the lower end surface of the end plate portion 42, and the flow path recess 81 of the intermediate partition plate 60 is formed by opening to the upper end surface of the intermediate partition plate 60. NS. As shown in FIGS. 4 and 5, the flow path recess 81 is formed so as to extend in the radial direction when viewed in a plane, and when viewed in a radial cross section, the flow path hole 80 and the cylinder of the cylinder 31 are formed as shown in FIG. It is formed so as to straddle the chamber 33. Specifically, in the flow path recess 81, the outer peripheral side end surface 81a is formed flush with the outer peripheral side end surface 80a of the flow path hole 80. However, the outer peripheral side end surface 81a of the flow path recess 81 may be located radially outside the outer peripheral side end surface 80a of the flow path hole 80. The flow path recess 81 has a configuration in which the inner peripheral side end surface 81b is located radially inside the inner peripheral surface 31c of the cylinder 31. Therefore, a part of the flow path recess 81 on the inner side in the radial direction faces and opens in the cylinder chamber 33 of the cylinder 31 in the vertical direction.

With this configuration, the flow path recess 81 communicates with the flow path hole 80 and the cylinder chamber 33, and the flow path hole 80 and the flow path recess 81 communicate with the suction chamber 33a of the first compression portion 30A from the suction hole 34. A suction flow path 83 is formed. The flow path recess 81 has a rectangular shape in both the radial cross section and the circumferential cross section, but the bottom surface may have an arc shape or an inclined surface particularly in the circumferential cross section.

As described above, in the first embodiment, the suction flow path 83 communicating the suction pipe 5 and the suction chamber 33a is provided with the end plate portion 42 of the first support member 40 provided in contact with the upper end surface of the cylinder 31. , It is configured via a flow path recess 81 formed in each of the intermediate partition plate 60 provided in contact with the lower end surface of the cylinder 31. With this configuration, in a configuration in which the suction chamber 33a is formed on an extension of the suction pipe 5 in the connection direction to the container 1, the refrigerant from the suction pipe 5 can be guided to the suction chamber 33a.

The cross-sectional area of the suction flow path 83 is preferably larger than the cross-sectional area of the flow path of the suction hole 34 in order to secure the suction flow rate in the suction flow path 83. Specifically, the suction flow path 83 includes a flow path of the flow path hole 80 from the suction hole 34 to the flow path recess 81, a flow path inward in the radial direction in the flow path recess 81, and suction from the flow path recess 81. It is composed of a flow path toward the chamber 33a. Since two suction flow paths 83 are formed vertically, it is desirable that each of the flow path cross-sectional areas obtained by doubling each flow path is equal to or larger than the flow path cross-sectional area of the suction pipe 5. Here, the same or larger flow path cross-sectional area means that the hydraulic diameter is the same or larger. With this configuration, it is possible to secure the suction flow rate without causing suction pressure loss.

Further, the cylinder 31 has a pressure balance hole 90 that penetrates in the axial direction in the vicinity of the spring installation surface 36 (however, radially outside the spring installation surface 36) and communicates the suction hole 34 and the flow path recess 81. Two suction holes 34 are formed vertically above and below the suction hole 34. The pressure balance hole 90 communicates the space 37 (see FIG. 6) (hereinafter referred to as the valve body back space 37) between the valve body 71 and the spring installation surface 36 with the flow path recess 81, and the valve body back space 37. It has the function of adjusting the pressure of. The pressure balance hole 90 is not limited to the position and orientation shown in FIG. 6, and the suction hole 34 and the flow path are radially inside the position of the valve body 71 when the suction check valve 70 is in the closed state. It may be configured so as to communicate with the recess 81.

The intermediate partition plate 60 is formed with an oil escape hole 61 in which one end communicates with the flow path recess 81 of the intermediate partition plate 60 and the other end communicates with the suction chamber 33a of the second compression portion 30B. The high-pressure refrigerant discharged from the compressor 100 contains a small amount of lubricating oil, and since it circulates in the refrigerant circuit together with the refrigerant, the suction refrigerant also contains the lubricating oil. Since the lubricating oil flows into the flow path recess 81 of the intermediate partition plate 60 together with the refrigerant, an oil escape hole 61 is provided so that the lubricating oil flowing into the flow path recess 81 is discharged without accumulating in the flow path recess 81. ing. The lubricating oil accumulated in the flow path recess 81 of the intermediate partition plate 60 is supplied to the suction chamber 33a of the second compression portion 30B located below the intermediate partition plate 60 through the oil relief hole 61. Since the flow path recess 81 of the end plate portion 42 of the first support member 40 is opened downward, the lubricating oil does not collect in the flow path recess 81 of the end plate portion 42.

In the second compression unit 30B in which the suction check valve 70 is not provided, the suction hole 34 in the cylinder 31 extends the cylinder 31 from the outer peripheral surface to the inner peripheral surface 31c of the cylinder 31, in other words, from the outer peripheral surface in the radial direction to the cylinder chamber. It is formed as a through hole that penetrates up to 33.

Next, the operation of the suction check valve 70 will be described.

FIG. 8 is an enlarged view of the peripheral structure of the suction check valve surrounded by a dotted line in FIG. 1, and is a diagram showing a state in which the suction check valve is closed. See FIG. 6 above for the open state of the suction check valve 70.
During the operation of the rotary compressor 100, the suction refrigerant flows from the suction pipe 5 into the suction hole 34, the spring 72 contracts due to the force of the flow, and the valve body 71 moves inward in the radial direction. As the valve body 71 moves inward in the radial direction, the volume of the valve body back space 37 is reduced, and the pressure increasing with the volume reduction is released to the flow path recess 81 through the pressure balance hole 90. As a result, the pressure rise in the valve body back space 37 is prevented, the pressure is equalized before and after the movement direction of the valve body 71, and the valve body 71 can smoothly move inward in the radial direction.

Then, the valve body 71 moves further inward in the radial direction from the flow path hole 80, so that the suction hole 34 communicates with the flow path recess 81 via the flow path hole 80, and the suction check valve 70 is opened (a state in which the suction check valve 70 is opened. FIG. 6). When the suction check valve 70 is opened in this way, the suction refrigerant flows from the suction hole 34 into the suction chamber 33a through the flow path hole 80 and the flow path recess 81.

When the operation of the rotary compressor 100 is stopped, the valve body 71 is pressed from the inside in the radial direction to the outside in the radial direction by the spring force of the spring 72. Further, the rotating shaft 4 rotates in the reverse direction due to the differential pressure between the compression chamber 33b and the suction chamber 33a, and the high-pressure refrigerant in the compression chamber 33b flows into the flow path recess 81 via the suction chamber 33a. The refrigerant that has flowed into the flow path recess 81 flows into the valve body back space 37 through the pressure balance hole 90, and as a result, the inside of the valve body back space 37 is boosted and the valve body 71 is pressed outward in the radial direction. It works.

When the operation of the rotary compressor 100 is stopped in this way, the spring force of the spring 72 and the pressure of the high-pressure refrigerant due to the reverse rotation act on the valve body 71 in the direction of closing the valve body 71. Due to this spring force and pressure, the valve body 71 moves from the inside in the suction hole 34 to the outside in the radial direction, the opening of the suction pipe 5 is closed by the sealing surface 71a of the valve body 71, and the suction check valve 70 is opened. Closed. In this way, the suction check valve 70 closes the opening of the suction pipe 5, so that the reverse rotation of the rotating shaft 4 is stopped, preventing the refrigerant from flowing back from the cylinder chamber 33 to the suction pipe 5, and also preventing the oil from flowing back. It is possible to prevent the lubricating oil in the reservoir 1a from flowing out from the suction pipe 5 through the oil supply passage 4A.

The reverse rotation of the rotating shaft 4 introduces the high-pressure refrigerant from the flow path recess 81 into the valve body back space 37 via the pressure balance hole 90, and at the same time, the valve body passes through the flow path hole 80 from the flow path recess 81. Similarly, the high-pressure refrigerant is introduced into the space on the sealing surface 71a side of 71. However, the space radially outside the sealing surface 71a of the valve body 71 is also communicated with the pipe outside the container 1 via the suction pipe 5, and the capacity of the space is larger than the capacity of the valve body back space 37. Large enough. Therefore, unlike the valve body back space 37, the pressure does not increase in the space radially outside the sealing surface 71a of the valve body 71. Therefore, immediately after the operation is stopped, the pressure on the valve body back space 37 side becomes higher, and as a result, the suction check valve 70 is quickly closed as described above.

Further, when the operation is stopped, the pressure of the high-pressure refrigerant due to the reverse rotation acts on the valve body 71 in addition to the spring force, so that the suction check valve 70 is quickly closed even if the spring force of the spring 72 is weak. This makes it possible to prevent a delay in closing the suction check valve 70. Therefore, a spring 72 having a weak spring force can be used. As a result, it is possible to avoid a situation in which the suction check valve 70 is difficult to open during operation, the suction check valve 70 cannot be fully opened, and the suction flow path 83 is reduced. As described above, the suction check valve 70 is configured to be easy to open and close.

When the suction check valve 70 is closed as described above, the outlet of the high-pressure refrigerant directed from the compression chamber 33b to the suction hole 34 is blocked by the reverse rotation, so that the reverse rotation of the rotating shaft 4 is restricted. .. In this way, the force that restrains the reverse rotation acts on the rotating shaft 4 on the first compression portion 30A side, so that the rotating shaft 4 is common even if the suction check valve 70 is not provided on the second compression portion 30B side. Therefore, the reverse rotation is suppressed, and the reverse rotation can be ended at an early stage.

Further, the lubricating oil in the flow path recess 81 is supplied to the suction chamber 33a of the second compression portion 30B through the oil relief hole 61 formed in the intermediate partition plate 60. Therefore, the lubricating oil does not accumulate in the flow path recess 81 of the intermediate partition plate 60 and block the suction flow path 83.

As described above, according to the first embodiment, since the suction check valve 70 is arranged in the suction hole 34, it is possible to suppress the reverse rotation of the rotating shaft 4 when the operation is stopped, and the lubricating oil container. 1 The outflow to the outside can be suppressed.

Here, as a flow path configuration connecting the suction pipe 5 to the suction chamber 33a, in the case of a configuration in which the suction chamber is located in a direction bent perpendicular to the connection direction of the suction pipe to the container as in Patent Document 1. A suction check valve may be installed at the bent portion. However, in the case where the suction chamber 33a is located on the extension of the suction pipe 5 in the connecting direction to the container 1, there is no bent portion as in Patent Document 1. Therefore, it is necessary to devise the installation of the suction check valve 70 and the securing of the flow path from the suction hole 34 to the suction chamber 33a in the state where the suction check valve 70 is open.

Regarding this, in the first embodiment, as described above, the suction check valve 70 is arranged in the suction hole 34 formed by the blind hole provided in the cylinder 31. Further, the cylinder 31 is provided with a flow path hole 80, and the flow path recess 81 is provided in each of the end plate portion 42 of the first support member 40, which is a closing member, and the intermediate partition plate 60, which are located above and below the cylinder 31 in the axial direction. Is provided to secure a suction flow path 83 from the suction hole 34 to the suction chamber 33a. As a result, even in a configuration in which the suction chamber 33a is located on the extension of the suction pipe 5 in the connection direction to the container 1, the suction flow path can be secured during operation, and the suction flow rate can be secured. Further, it is possible to suppress the reverse rotation of the rotating shaft 4 and the outflow of the lubricating oil to the outside of the container 1 when the operation is stopped.

Further, when the suction check valve 70 is opened during operation, the pressure in the valve body back space 37 is released from the pressure balance hole 90 to the flow path recess 81, so that the valve body 71 is smoothly moved inward in the radial direction. The suction check valve 70 can be opened quickly. Further, when the operation is stopped, the high pressure from the compression chamber 33b acts on the valve body back space 37 through the pressure balance hole 90, so that the suction check valve 70 can be closed quickly.

Further, since the oil relief hole 61 is provided, it is possible to prevent the lubricating oil from accumulating in the flow path recess 81 of the intermediate partition plate 60.

The rotary compressor 100 of the present invention is not limited to the structure shown in FIG. 1, and various modifications can be implemented as follows, for example, as long as the gist of the present invention is not deviated.

In FIG. 1, the flow path recess 81 is provided in both the end plate portion 42 and the intermediate partition plate 60 of the first support member 40, but it may be provided in only one of them.

Further, in FIG. 1, a pressure balance hole 90 is provided for each of the upper and lower flow path recesses 81, and the suction holes 34 communicate with each of the upper and lower flow path recesses 81. It may be provided.

Further, in FIG. 1, the pressure balance hole 90 extends in the axial direction so that the suction hole 34 and the flow path recess 81 communicate with each other. However, as shown in FIG. 9, the pressure balance hole 90 extends in the radial direction. It may be configured.

FIG. 9 is a diagram showing a modified example of the pressure balance hole in the rotary compressor according to the first embodiment of the present invention.
In this modification, the pressure balance hole 90A extends radially inward from the spring installation surface 36 and penetrates to the inner peripheral surface 31c of the cylinder 31, and is formed by the suction hole 34 (valve body back space 37) and the suction chamber 33a. And communicate with.
Even with this configuration, the pressure in the valve body back space 37 can be adjusted by the pressure balance hole 90A, and the same effect as when the pressure balance hole 90 extending in the axial direction is provided can be obtained.

In the first embodiment, the suction check valve 70 is provided in the first compression section 30A, but as shown in FIG. 10 below, the suction check valve 70 is provided in the second compression section 30B. It may be provided.

FIG. 10 is a diagram showing a modified example of the installation position of the suction check valve in the rotary compressor according to the first embodiment of the present invention, and is a diagram showing a state in which the suction check valve is open. FIG. 11 is a diagram showing a modified example of the installation position of the suction check valve in the rotary compressor according to the first embodiment of the present invention, and is a diagram showing a state in which the suction check valve is closed.
As shown in FIG. 10, the suction check valve 70 may be installed in the cylinder 31 of the second compression unit 30B. In this case, the flow path recess 81 is formed on the surface of the intermediate partition plate 60 and the end plate portion 52 of the second support member 50 on the suction check valve 70 side, respectively. The flow path recess 81 of the intermediate partition plate 60 opens to the lower end surface of the intermediate partition plate 60, and the flow path recess 81 of the end plate portion 52 of the second support member 50 opens to the upper end surface of the end plate portion 52. It is formed. The operation of the suction check valve 70 is the same as when it is installed in the cylinder 31 of the first compression unit 30A.
In this case, in the first compression portion 30A in which the suction check valve 70 is not provided, the suction hole 34 in the cylinder 31 is formed as a through hole that penetrates the cylinder 31 from the radial outer circumference to the cylinder chamber 33. ing.

As described above, the suction check valve 70 may be installed at either the cylinder 31 of the first compression unit 30A or the cylinder 31 of the second compression unit 30B, but the cylinder 31 side of the first compression unit 30A located above. Is more preferable. This is because the lubricating oil accumulated in the flow path recess 81 of the intermediate partition plate 60 can be supplied to the suction chamber 33a of the second compression portion 30B below the first compression portion 30A through the oil relief hole 61. ..

In the case of the configuration in which the suction check valve 70 is installed in the cylinder 31 of the second compression unit 30B, the oil escape hole is not provided. This is because if an oil escape hole is provided in the flow path recess 81 of the second support member 50, the low pressure flow path recess 81 and the inside of the high pressure container 1 will communicate with each other. In this modification, since the flow path recess 81 of the intermediate partition plate 60 is opened downward, the lubricating oil does not collect in the flow path recess 81 of the intermediate partition plate 60.

Further, even in the case where the suction check valve 70 is provided in the second compression portion 30B, the flow path recess 81 is provided in only one of the intermediate partition plate 60 and the end plate portion 52 of the second support member 50. May be.

Further, in the above, the case where the present invention is applied to a two-cylinder rotary compressor having two cylinders is shown, but the present invention can also be applied to a one-cylinder rotary compressor having one cylinder.

Further, in the above, the case where the present invention is applied to a rotary compressor in which the rolling piston and the vane are separately formed is shown, but the rolling piston and the vane are integrally formed to guide the advancement and retreat of the vane. The present invention can also be applied to a type of rotary compressor called a swing compressor in which a pair of bushes are arranged in contact with both side surfaces of the vane.

1 Container, 1a Oil reservoir, 2 Motor, 2a Rotor, 2b Fixture, 3 Compression mechanism, 4 Rotating shaft, 4A Refueling passage, 4a Eccentric shaft, 5 Suction pipe, 6 Discharge pipe, 30A 1st compression part, 30B 2nd compression part, 31 cylinder, 31a through hole, 31b vane groove, 31c inner peripheral surface, 32 rolling piston, 33 cylinder chamber, 33a suction chamber, 33b compression chamber, 34 suction hole, 35 discharge notch, 36 spring installation surface (End face), 36a circular recess, 37 valve body back space, 39 vanes, 40 first support member, 41 bearing part, 42 end plate part, 42a discharge port, 50 second support member, 51 bearing part, 52 end plate part , 60 Intermediate partition plate, 61 Oil relief hole, 70 Suction check valve, 71 Valve body, 71a Seal surface, 72 Spring, 80 Flow hole, 80a Outer peripheral end face, 81 Flow path recess, 81a Outer peripheral end face, 81b Peripheral end face, 83 suction flow path, 90 pressure balance hole, 90A pressure balance hole, 100 rotary compressor.

Claims (4)

A container in which lubricating oil is stored, a suction pipe connected from the outside through the container, a rotating shaft housed in the container and formed with a refueling passage, and a rotating shaft housed in the container and rotated. A rotary compressor provided with a compression mechanism that compresses a refrigerant by rotation of a shaft, and the lubricating oil is supplied to the compression mechanism via the lubrication passage.
The compression mechanism
A cylinder with a through hole through which the rotating shaft passes,
A piston provided on the outer circumference of the rotating shaft and rotating eccentrically inside the through hole,
The cylinder is provided with two closing members arranged one above the other in the axial direction.
By closing the through hole of the cylinder with the two closing members, a cylinder chamber is formed in which the refrigerant sucked into the container from the suction pipe is sucked and compressed.
The cylinder is formed with a suction hole formed by a blind hole that opens on the outer periphery of the cylinder and extends in the radial direction, and the suction pipe is connected to the opening side of the suction hole to connect the suction pipe. It has a configuration in which the cylinder chamber is formed on an extension line in the direction.
A suction check valve is arranged in the suction hole to allow the flow of the refrigerant from the suction pipe to the suction chamber in the cylinder chamber and prevent the flow in the opposite direction.
With the suction check valve open, a suction flow path for guiding the refrigerant from the suction pipe to the suction chamber is formed via one or both of the two closing members.
The suction flow path is
A flow path hole formed in the cylinder communicating with the suction hole,
One or both of the two closing members arranged above and below the axial direction of the cylinder in which the flow path hole is formed are formed on the surface on the suction check valve side, and the flow path hole and the suction are formed. It is composed of a flow path recess that communicates with the chamber.
The suction check valve includes a valve body that opens and closes the opening of the suction pipe by moving inside the suction hole, and a spring that urges the valve body in a direction of closing the opening of the suction pipe. When the suction check valve is open, the valve body is located radially inside the flow path hole to form the suction flow path .
The compression mechanism includes two compression portions including the cylinder and the piston in the axial direction, and further includes another closing member in addition to the two closing members.
When one of the two compression units is a first compression unit and the other is a second compression unit,
The first compression section and the second compression section are arranged in the axial direction, and the upper portion of the first compression section in the axial direction, between the first compression section and the second compression section, is the second. The closing member is arranged at each of the lower portions of the compression portion in the axial direction.
The suction check valve is arranged in the suction hole formed in the cylinder of one of the first compression section and the second compression section.
The suction flow path is formed in one or both of the two closing members arranged vertically above and below the first compression portion and the second compression portion on which the suction check valve is arranged. ,
The suction check valve is arranged in the suction hole of the first compression portion.
The flow path recess is formed in the intermediate partition plate which is the closing member between the first compression portion and the second compression portion, and the flow path recess of the intermediate partition plate and the second compression portion A rotary compressor in which an oil relief hole communicating with the suction chamber is formed in the intermediate partition plate. The rotary according to claim 1, wherein a pressure balance hole for communicating the suction hole and the flow path recess is formed in the cylinder on the radial side of the position of the valve body in the state where the suction check valve is open. Compressor. The rotary compressor according to claim 2, wherein the pressure balance holes are formed in each of the flow path recesses. The rotary compressor according to claim 1, wherein a pressure balance hole extending radially inward from an end surface of the suction hole in the depth direction and communicating the suction hole and the suction chamber is formed in the cylinder.

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