WO2023228874A1

WO2023228874A1 - Rotary compressor and method for manufacturing rotary compressor

Info

Publication number: WO2023228874A1
Application number: PCT/JP2023/018689
Authority: WO
Inventors: 紘史島谷
Original assignee: 三菱重工サーマルシステムズ株式会社
Priority date: 2022-05-25
Filing date: 2023-05-19
Publication date: 2023-11-30
Also published as: JP2023173317A

Abstract

Provided is a rotary compressor wherein a rotary compression unit (6) has: a piston rotor; a cylinder that houses the piston rotor; an upper bearing (4A) and a lower bearing that are arranged so as to sandwich the cylinder therebetween and form a compression chamber (60A) that houses the piston rotor; and a discharge valve (64) that is attached to the upper bearing (4A) and opens and closes a discharge hole (4Aa) for discharging the refrigerant compressed in the compression chamber (60A). A facing surface (4Ab) of the upper bearing (4A), facing an electric motor, is formed with a recess (4Ad) that houses the discharge valve (64). A bottom (4Ad1) of the recess (4Ad) is formed with a discharge hole (4Aa) that penetrates therethrough along the axis of rotation. The recess (4Ad) is formed with a slope (4Ad2) where the height from the bottom (4Ad1) to the facing surface (4Ab) decreases as the distance from the discharge hole (4Aa) increases.

Description

Rotary compressor and rotary compressor manufacturing method

The present disclosure relates to a rotary compressor and a method for manufacturing a rotary compressor.

A rotary compressor is known that compresses a refrigerant using a rotor arranged eccentrically with respect to a rotating shaft within a compression chamber (see, for example, Patent Document 1). In the rotary compressor disclosed in Patent Document 1, the upper surface of the upper bearing is dug down to form a thin walled portion, and a discharge port that penetrates toward the cylinder chamber is formed in the thin walled portion. The rotary compressor disclosed in Patent Document 1 achieves high pump efficiency by shortening the discharge port and reducing the volume.

Japanese Patent Application Publication No. 11-132178

However, in the rotary compressor disclosed in Patent Document 1, the discharge port is provided at the bottom of the recess formed by digging into the upper surface of the upper bearing, so that the refrigerant gas discharged from the discharge port reaches the end surface of the recess. Collisions can cause large pressure losses. Particularly in a small rotary compressor (for example, a housing inner diameter of Φ95 [mm] or less), the distance from the discharge port to the end face of the recess is short, so the pressure loss is significant.

The present disclosure has been made in view of the above circumstances, and provides a rotary compressor and a rotary compressor capable of suppressing pressure loss of refrigerant discharged from a discharge valve housed in a recess formed in a bearing. An object of the present invention is to provide a method for manufacturing a rotary compressor.

In order to solve the above problems, a rotary compressor of the present disclosure includes: a housing having a cylindrical part extending in a vertical direction along an axis; a compression part housed in the housing and compressing a refrigerant; a drive section that is housed in a housing and drives the compression section by rotating a rotation shaft that extends along the axis, the compression section being fixed to the rotation shaft and biased with respect to the axis. a piston rotor that rotates around the center; a cylinder that accommodates the piston rotor; and a cylinder that rotatably supports the rotating shaft about the axis and is arranged to sandwich the cylinder along the axis to accommodate the piston rotor. a pair of bearings that form a compression chamber; and a discharge valve that is attached to one of the pair of bearings and opens and closes a discharge hole that discharges the refrigerant compressed in the compression chamber; A recess for accommodating the discharge valve is formed in the opposing surface facing one of the driving parts, and the discharge hole is formed at the bottom of the recess to penetrate along the axis. A sloped portion is formed in the recess such that the height from the bottom portion to the opposing surface decreases as the distance from the discharge hole increases.

Further, a method of manufacturing a rotary compressor according to the present disclosure is a method of manufacturing a rotary compressor, wherein the rotary compressor includes a housing having a cylindrical portion extending in a vertical direction along an axis; a compression section that is housed in the housing and compresses the refrigerant; and a drive section that is housed in the housing and drives the compression section by rotating a rotating shaft that extends along the axis, and the compression section is configured to compress the refrigerant. a piston rotor that is fixed to a rotating shaft and rotates eccentrically with respect to the axis; a cylinder that accommodates the piston rotor; and a cylinder that rotatably supports the rotating shaft about the axis and rotates along the axis. a pair of bearings that are arranged to sandwich the piston rotor and form a compression chamber that accommodates the piston rotor; and a discharge hole that is attached to one of the pair of bearings and that opens and closes the discharge hole that discharges the refrigerant compressed in the compression chamber. a discharge valve, and forming a recess for accommodating the discharge valve by cutting a facing surface of one of the pair of bearings that faces the driving part; and a step of forming a recess in a bottom of the recess, forming the discharge hole penetrating along the axis, and in the step of forming the recess, the height from the bottom to the opposing surface decreases as the distance from the discharge hole increases. A sloped portion is formed.

According to the present disclosure, it is possible to provide a rotary compressor that can suppress pressure loss of refrigerant discharged from a discharge valve housed in a recess formed in a bearing, and a method for manufacturing the rotary compressor. .

1 is a longitudinal cross-sectional view showing a rotary compressor according to an embodiment of the present disclosure. FIG. 2 is a side view showing the rotary compressor of FIG. 1 installed on an installation surface. FIG. 3 is a plan view of the upper bearing of the rotary compression section viewed from above along the rotation axis. 4 is a cross-sectional view taken along the line AA of the rotary compression section shown in FIG. 3. FIG. 4 is a partially enlarged view of the vicinity of a discharge hole of the rotary compression section shown in FIG. 3. FIG. It is a top view of the upper bearing of the rotary compression part of a 1st modification seen from above along a rotational axis. 7 is a sectional view taken along the line BB of the rotary compression section shown in FIG. 6. FIG. It is a top view of the upper bearing of the rotary compression part of a 2nd modification seen from above along a rotation axis. 9 is a sectional view taken along the line CC of the rotary compression section shown in FIG. 8. FIG.

An embodiment according to the present disclosure will be described below with reference to the drawings.
As shown in FIG. 1, a rotary compressor 1 according to the present embodiment is a hermetic electric rotary compressor used, for example, in an air conditioner or a refrigeration device. The rotary compressor 1 includes a compressor main body 10 and an accumulator 12. The accumulator 12 is connected to the compressor main body 10 via a suction pipe 11.

The compressor main body 10 includes a substantially cylindrical housing 2, a rotating shaft 3, an electric motor (drive section) 5, and a rotary compression section 6. The rotation axis CL of the rotation shaft 3 coincides with the central axis of the housing 2. The rotating shaft 3 is arranged so that its extension direction is the vertical direction, and rotates around the rotation axis CL within the housing 2.

The housing 2 is of a closed type and extends in the vertical direction. The housing 2 includes a cylindrical main body portion (cylindrical portion) 21 extending in a vertical direction VD along the rotation axis CL, and an upper lid portion 22 and a lower lid portion 23 that close the upper and lower openings of the main body portion 21. We are prepared.

A plurality of legs 7 are fixed below the main body 21. The legs 7 are arranged in the circumferential direction of the main body 21 at predetermined angular intervals. As shown in FIG. 2, each leg portion 7 is fixed to the installation surface FL via vibration-proof rubber 8.

The housing 2 has an opening 24 formed at a position facing the outer circumferential surface of the cylinder 60 at the lower part of the side wall. A suction port 25 is formed in the cylinder 60 at a position facing the opening 24 and communicates with a predetermined position within the cylinder.

An oil reservoir is formed at the bottom of the housing 2 to store lubricating oil. The liquid level of the oil reservoir when the oil is initially filled is located above the rotary compression section 6. Thereby, the rotary compression section 6 is driven in the oil pool.

The upper lid part 22 is provided with a discharge pipe 13 and a terminal block 30. The discharge pipe 13 penetrates the upper lid portion 22 in the thickness direction, and has a lower portion disposed inside the housing 2 and an upper portion disposed outside the housing 2 . The discharge pipe 13 discharges the compressed refrigerant to the outside of the housing 2 . The terminal block 30 is provided with three power supply terminals 31 for supplying power to the electric motor 5. Three-phase power is supplied to the power supply terminal 31 from an inverter device (not shown).

The accumulator 12 is used to separate the refrigerant into gas and liquid before supplying it to the compressor main body 10. The accumulator 12 has a substantially cylindrical shape and is fixed to the outer peripheral surface of the housing 2 via a bracket 14. An inlet pipe 15 is provided at the top of the accumulator 12 for introducing refrigerant led from an evaporator (not shown). A suction pipe 11 for causing internal refrigerant to be sucked into the compressor main body 10 is connected to the accumulator 12 . Suction pipe 11 is connected to suction port 25 through opening 24 of housing 2 . The accumulator 12 supplies gaseous refrigerant to the rotary compression section 6 via the suction pipe 11 .

The electric motor 5 is housed in the center of the housing 2 in the vertical direction. The electric motor 5 includes a rotor 51 and a stator 52. The rotor 51 is fixed to the outer peripheral surface of the rotating shaft 3 and is arranged above the rotary compression section 6 . The stator 52 is arranged to surround the outer peripheral surface of the rotor 51 and is fixed to the inner surface 21 a of the main body 21 of the housing 2 .
Electric power is supplied to the stator 52 from each power supply terminal 31 via the wiring 32 . The electric motor 5 drives the rotary compression section 6 by rotating the rotating shaft 3 using electric power supplied from the power supply terminal 31 .

The rotary compression unit 6 is a device that is housed in the housing 2 and compresses refrigerant. The rotary compression section 6 is placed between the upper bearing 4A and the lower bearing 4B from above and below. The upper bearing 4A and the lower bearing 4B are each made of a metal material and are fixed to a cylinder 60 that constitutes the rotary compression section 6 with bolts 61. Note that the rotating shaft 3 is rotatably supported around the rotational axis CL by an upper bearing 4A and a lower bearing 4B.

The rotary compression section 6 is arranged at the bottom of the housing 2 below the electric motor 5. The rotary compression section 6 includes an upper bearing 4A, a lower bearing 4B, a cylinder 60, an eccentric shaft section 62, a piston rotor 63, and a discharge valve 64 (see FIG. 3).

The cylinder 60 is formed with a compression chamber 60A, a suction hole 60B, and a discharge hole (not shown). The compression chamber 60A is formed inside the cylinder 60. A piston rotor 63 is housed within the compression chamber 60A. The upper bearing 4A and the lower bearing 4B are arranged to sandwich the cylinder 60 along the rotation axis CL, and form a compression chamber 60A that accommodates the piston rotor 63.

The rotary compression part 6 is fixed to the inner surface 21a of the main body part 21 of the housing 2. Specifically, the upper bearing 4A that sandwiches the cylinder 60 is fixed to the inner surface 21a of the main body portion 21 of the housing 2. The upper bearing 4A is fixed by plug welding at multiple locations in the circumferential direction of the housing 2. Note that instead of plug welding, shrink fitting, cold fitting, etc. may be used.

The eccentric shaft portion 62 is provided at the lower end of the rotating shaft 3 , and is provided inside the piston rotor 63 so as to be offset (eccentric) in a direction orthogonal to the central axis of the rotating shaft 3 .
The piston rotor 63 has a cylindrical shape with an outer diameter smaller than the inner diameter of the cylinder 60, is disposed inside the cylinder 60, and is fixedly attached to the outer periphery of the eccentric shaft portion 62. The piston rotor 63 rotates eccentrically with respect to the rotation axis CL as the rotation shaft 3 rotates.

The suction hole 60B is a hole for guiding the refrigerant into the interior of the cylinder 60, and is formed in a direction perpendicular to the rotation axis CL. The high-pressure refrigerant discharged from the discharge hole 4Aa (see FIG. 4) formed in the cylinder 60 is guided into the space formed between the discharge cover 65 and the upper bearing 4A, and then the high-pressure refrigerant is introduced into the space provided in the discharge cover 65. The liquid is introduced into the internal space of the housing 2 through a discharge hole (not shown).

The rotary compressor 1 described above operates as follows. Refrigerant led from an evaporator (not shown) is taken into the accumulator 12 via an inlet pipe 15. The refrigerant is separated into gas and liquid within the accumulator 12, and the gas phase is led to the rotary compression section 6 via the suction pipe 11. In the rotary compression section 6, refrigerant is introduced into the compression chamber 60A via the suction hole 60B.

Then, due to the eccentric rolling of the piston rotor 63, the volume of the compression chamber 60A gradually decreases, and the refrigerant is compressed. The compressed refrigerant is guided to the internal space of the housing 2 after passing through the space within the discharge cover 65 via the discharge hole 4Aa. The refrigerant discharged into the internal space of the housing 2 is guided from a discharge pipe 13 provided at the upper part of the housing 2 to a condenser (not shown).

Next, the upper bearing 4A of the rotary compression section 6 and the discharge valve 64 will be explained with reference to FIGS. 3 to 5. FIG. 3 is a plan view of the upper bearing 4A of the rotary compression section 6 viewed from above along the rotation axis CL. FIG. 4 is a sectional view taken along the line AA of the rotary compression section 6 shown in FIG. 3 and 4 show a state in which the discharge cover 65 is removed from the upper bearing 4A. FIG. 5 is a partially enlarged view of the vicinity of the discharge hole 4Aa of the rotary compression section 6 shown in FIG. 3.

As shown in FIGS. 3 and 4, a discharge valve 64 is attached to the upper bearing 4A. The discharge valve 64 is a device that opens and closes the discharge hole 4Aa that discharges the refrigerant compressed in the compression chamber 60A. The discharge valve 64 includes a valve body 64a, a retainer 64b, and a fastening bolt 64c.

The valve body 64a is a plate-like member that has a biasing force that closes the discharge hole 4Aa when the pressure of the refrigerant in the compression chamber 60A is below a predetermined pressure. The base end 64a1 of the valve body 64a is fixed to the position of the fastening hole 4Ac of the upper bearing 4A by a fastening bolt 64c. The tip 64a2 of the valve body 64a is disposed in the discharge hole 4Aa and closes the discharge hole 4Aa.

A recess 4Ad that accommodates the discharge valve 64 is formed in the opposing surface 4Ab of the upper bearing 4A that faces the electric motor 5. A discharge hole 4Aa penetrating in the vertical direction VD along the rotation axis CL is formed in the bottom portion 4Ad1, which is the lower end of the recess 4Ad in the vertical direction VD.

The recess 4Ad is formed with an inclined portion 4Ad2 in which the height in the vertical direction VD from the bottom portion 4Ad1 to the opposing surface 4Ab decreases as the distance in the horizontal direction HD from the discharge hole 4Aa increases. The inclined portion 4Ad2 extends in the vertical direction VD from the bottom portion 4Ad1 to the opposing surface 4Ab along the extending direction from the base end 64a1 to the distal end 64a2 (same direction as the horizontal direction HD) of the valve body 64a of the discharge valve 64. It is formed so that the height gradually decreases.

As shown in FIG. 3, the inclined portion 4Ad2 has a first recess 4Ad21 and a second recess 4Ad22 when the opposing surface 4Ab of the upper bearing 4A is viewed along the rotation axis CL. The first recess 4Ad21 is a circular portion having a diameter (first diameter) D1 centered on the discharge hole 4Aa. The second recess 4Ad22 is a circular portion having a diameter (second diameter) D2 centered on the axis Z2 (see FIG. 5) that is spaced from the discharge hole 4Aa. The second recess 4Ad22 is arranged to overlap with the first recess 4Ad21.

As shown by the arrow in FIG. 5, when the pressure of the refrigerant in the compression chamber 60A exceeds a predetermined pressure and the tip 64a2 of the valve body 64a separates from the discharge hole 4Aa, the discharge valve 64 becomes open and the refrigerant is discharged. The water flows radially from the hole 4Aa along the horizontal direction HD. The refrigerant discharged from the discharge hole 4Aa collides with the end of the first recess 4Ad21 (at a position D1/2 from the axis Z1) and is guided upward in the vertical direction VD.

The refrigerant that has passed through the end of the first recess 4Ad21 further flows radially from the discharge hole 4Aa along the horizontal direction HD, collides with the end of the second recess 4Ad22, and is guided upward in the vertical direction VD. The refrigerant guided upward in the vertical direction VD and reaching the opposing surface 4Ab of the upper bearing 4A is guided into the internal space of the housing 2 through a discharge hole (not shown) provided in the discharge cover 65.

It is preferable that the diameter D1 of the first recess 4Ad21 and the diameter D2 of the second recess 4Ad22 satisfy the following formula (1).
D1=D2 (1)
Further, the diameter D1 and the diameter D2 may be set so as to satisfy the following equation (2).
D1<D2 (2)

As shown in FIG. 4, the height (first height) H1 from the bottom 4Ad1 to the opposing surface 4Ab in the vertical direction VD of the first recess 4Ad21 is higher than the height H1 from the bottom 4Ad1 to the opposing surface in the vertical direction VD of the second recess 4Ad22. The height (second height) H2 up to 4Ab is lower. It is desirable that the height H1 and the height H2 have a relationship expressed by the following equation (3), for example.
0<(H1-H2)/H1≦0.5 (3)

As shown in FIG. 4, the discharge hole 4Aa is a hole formed circularly in plan view around an axis Z1 parallel to the rotation axis CL, and has a diameter D0. The discharge hole 4Aa and the first recess 4Ad21 are each formed in a circular shape centered on the axis Z1. It is desirable that the diameter D1 of the first recess 4Ad21 and the diameter D0 of the discharge hole 4Aa satisfy the relationship expressed by the following equation (4).
D1≧2・D0 (4)

In the rotary compression part 6 shown in FIGS. 3 to 5, the inclined part 4Ad2 has a first recessed part 4Ad21 and a second recessed part 4Ad22 in order of decreasing distance from the discharge hole 4Aa, but in other embodiments. There may be. For example, like the rotary compression part 6A of the first modification, the inclined part 4Ad2 has a first recessed part 4Ad21, a second recessed part 4Ad22, and a third recessed part 4Ad23 in order of shortest distance from the discharge hole 4Aa. Good too.

FIG. 6 is a plan view of the upper bearing 4A of the rotary compression section 6A of the first modification as viewed from above along the rotation axis CL. FIG. 7 is a sectional view taken along the line BB of the rotary compression section 6A shown in FIG.

As shown in FIG. 6, the inclined portion 4Ad2 has a first recess 4Ad21, a second recess 4Ad22, and a third recess 4Ad23 when the opposing surface 4Ab of the upper bearing 4A is viewed along the rotation axis CL. The third recess 4Ad23 is a circular portion having a diameter (third diameter) D3 centered on a position spaced apart from the discharge hole 4Aa.

It is preferable that the diameter D1 of the first recess 4Ad21, the diameter D2 of the second recess 4Ad22, and the diameter D3 of the third recess 4Ad23 satisfy the following formula (5).
D1=D2=D3 (5)
Further, the diameter D1, the diameter D2, and the diameter D3 may be set so as to satisfy the following equation (6).
D1<D2<D3 (6)

As shown in FIG. 7, the height H2 from the bottom 4Ad1 to the opposing surface 4Ab in the vertical direction VD of the second recess 4Ad22 is higher than the height H1 from the bottom 4Ad1 to the opposing surface 4Ab in the vertical direction VD of the second recess 4Ad22. is lower. Furthermore, the height (third) H3 of the third recess 4Ad23 from the bottom 4Ad1 to the opposing surface 4Ab in the vertical direction VD is lower than the height H2 of the second recess 4Ad22.

It is desirable that the height H1, the height H2, and the height H3 have the relationship expressed by the following equation (7), for example.
(H1-H2)<(H2-H3) (7)
That is, it is desirable to make the difference between the heights H2 and H3 larger than the difference between the heights H1 and H2 so that the difference in level becomes higher as the distance from the discharge hole 4Aa increases. This is to prevent such excessive pressure loss from occurring because if the distance from the discharge hole 4Aa is short and the level difference is large, the pressure loss when the refrigerant collides with the level difference will be excessive. be.

In the rotary compression part 6 shown in FIGS. 3 to 5, the inclined part 4Ad2 has a first recessed part 4Ad21 and a second recessed part 4Ad22 in order of decreasing distance from the discharge hole 4Aa, but in other embodiments. There may be. For example, as in the rotary compression section 6B of the second modification shown in FIG. 9, the height H of the inclined section 4Ad2 from the bottom section 4Ad1 to the opposing surface 4Ab in the vertical direction VD increases as the distance from the discharge hole 4Aa increases. It may have an inclined shape that gradually becomes lower.

FIG. 8 is a plan view of the upper bearing 4A of the rotary compression section 6B of the second modification as viewed from above along the rotation axis CL. FIG. 9 is a sectional view taken along the line CC of the rotary compression section 6B shown in FIG.

As shown in FIG. 9, the inclined portion 4Ad2 has an inclined shape in which the height H from the bottom portion 4Ad1 to the opposing surface 4Ab in the vertical direction VD gradually decreases as the distance from the discharge hole 4Aa increases. When the pressure of the refrigerant in the compression chamber 60A exceeds a predetermined pressure and the tip 64a2 of the valve body 64a separates from the discharge hole 4Aa, the discharge valve 64 becomes open and the refrigerant radially flows from the discharge hole 4Aa in the horizontal direction HD. flows along. The refrigerant discharged from the discharge hole 4Aa is guided upward in the vertical direction VD along the shape of the inclined portion 4Ad2.

Next, a method for manufacturing the rotary compressor 1 of this embodiment will be described. In the method for manufacturing the rotary compressor 1, the process of forming the recess 4Ad and the discharge hole 4Aa in the upper bearing 4A will be described below, and the description of other processes will be omitted.

The operator hits a drill (not shown) against the facing surface 4Ab of the upper bearing 4A where the recess 4Ad is not formed, and cuts the facing surface 4Ab, thereby forming the recess 4Ad shown in FIG. process of forming a recess). When forming the first recess 4Ad21 by spot boring, the operator aligns the center of the drill with the axis Z1 to form the first recess 4Ad21 having a diameter D1 centered on the axis Z1. The operator operates the drill so that the height H1 is from the bottom 4Ad1 to the opposing surface 4Ab.

Next, when forming the second recess 4Ad22 by spot boring, the operator aligns the center of the drill with the axis Z2 to form the second recess 4Ad22 having a diameter D2 centered on the axis Z2. The operator operates the drill so that the height from the bottom portion 4Ad1 to the opposing surface 4Ab is H2. Note that when the diameter D2 is made to match the diameter D1, the operator forms the second recess 4Ad22 without replacing the drill after forming the first recess 4Ad21. Through the above steps, the operator forms the inclined portion 4Ad2 having the first recessed portion 4Ad21 and the second recessed portion 4Ad22.

Next, the operator uses a drill to form a discharge hole 4Aa penetrating along the axis Z1 in the bottom 4Ad1 of the recess 4Ad formed in the opposing surface 4Ab of the upper bearing 4A by cutting. Thereafter, the operator fixes the discharge valve 64 at the position of the fastening hole 4Ac of the upper bearing 4A by fastening the fastening bolt 64c to the fastening hole 4Ac of the upper bearing 4A.

The rotary compressor 1 of this embodiment described above has the following functions and effects.
According to the rotary compressor 1 of this embodiment, the rotary compression section 6 is driven by the electric motor 5 rotating the rotating shaft 3. The rotary compression unit 6 gradually reduces the volume of the compression chamber 60A and compresses the refrigerant by rotating the piston rotor 63 within the compression chamber 60A formed by sandwiching the cylinder 60 between the upper bearing 4A and the lower bearing 4B. do. The compressed refrigerant is guided from the discharge hole 4Aa through the discharge valve 64 to the internal space of the housing 2 where the electric motor 5 is disposed.

According to the rotary compressor 1 of this embodiment, the discharge valve 64 is accommodated in the recess 4Ad formed in the opposing surface 4Ab facing the electric motor 5, and the refrigerant is compressed from the discharge valve 64 toward the recess 4Ad. is discharged. Since the inclined portion is formed in the recess 4Ad, the flow direction of the refrigerant discharged from the discharge valve toward the recess is changed so as to approach the opposite surface stepwise from the bottom. Therefore, the pressure loss of the refrigerant can be suppressed compared to the case where the flow direction of the refrigerant discharged from the discharge valve toward the recess is changed in only one step.

According to the rotary compressor 1 of the present embodiment, since the inclined portion 4Ad2 is formed along the extending direction from the base end to the distal end of the discharge valve 64, the discharge valve 64 opens and the refrigerant is guided. The flow direction of the refrigerant can be changed so as to gradually approach the opposite surface 4Ab from the bottom portion 4Ad1 along the stretching direction.

Moreover, according to the rotary compressor 1 of this embodiment, the inclined part 4Ad2 has the first recessed part 4Ad21 and the second recessed part 4Ad22, and is higher than the height H1 from the bottom part 4Ad1 of the first recessed part 4Ad21 to the opposing surface 4Ab. The height H2 from the bottom 4Ad1 of the second recess 4Ad22 to the opposing surface 4Ab is low. Therefore, the flow direction of the refrigerant discharged from the discharge valve 64 toward the recess 4Ad is arranged in at least two stages at the end of the first recess 4Ad21 and the end of the second recess 4Ad22 so that the flow direction of the refrigerant discharged from the discharge valve 64 approaches the opposite surface 4Ab from the bottom 4Ad1. Be changed. Therefore, the pressure loss of the refrigerant can be further suppressed compared to the case where the flow direction of the refrigerant discharged from the discharge valve 64 toward the recess 4Ad is changed only in one step at the end of the recess 4Ad.

According to the rotary compressor 1 of the present embodiment, by making the diameter D1 of the first recess 4Ad21 twice or more the diameter D0 of the discharge hole 4Aa, the refrigerant discharged from the discharge hole 4Aa is transferred to the diameter D0 of the discharge hole 4Aa. It is possible to prevent excessive pressure loss from occurring due to collision with the recess 4Ad at a position less than twice the position.

According to the rotary compressor 1 of this embodiment, by making the diameter D2 of the second recess 4Ad22 the same as the diameter D1 of the first recess 4Ad21, the first recess 4Ad21 and the second recess are formed on the opposing surface 4Ab of the upper bearing 4A. When forming 4Ad22, the same cutting tool can be used for processing.

According to the rotary compressor 1 of this embodiment, by making the diameter D2 of the second recess 4Ad22 larger than the diameter D1 of the first recess 4Ad21, the refrigerant is Pressure loss when colliding with the end face of the second recess 4Ad22 can be reduced.

According to the manufacturing method of the rotary compressor 1 of this embodiment, the step of forming the recess 4Ad is to cut the opposing surface 4Ab facing the upper bearing 4A, and as the distance from the discharge hole 4Aa increases, the recess 4Ad is formed from the bottom 4Ad1. An inclined portion 4Ad2 is formed with a lower height to the opposing surface 4Ab. Since the recess 4Ad having the inclined portion 4Ad2 is formed by cutting, a bearing with a smaller outer diameter (for example, Φ95 [mm] or less) can be easily produced compared to the case where the upper bearing 4A having the recess 4Ad is formed by casting. can be manufactured.

According to the rotary compressor 1 manufactured by the manufacturing method of this embodiment, the discharge valve 64 is accommodated in the recess 4Ad formed in the opposing surface 4Ab facing the electric motor 5, and the discharge valve 64 is connected to the recess 4Ad. Compressed refrigerant is discharged toward the Since the inclined portion 4Ad2 is formed in the recess 4Ad, the flow direction of the refrigerant discharged from the discharge valve 64 toward the recess 4Ad is changed so as to approach the opposite surface 4Ab in stages from the bottom 4Ad1. Therefore, the pressure loss of the refrigerant can be suppressed compared to the case where the flow direction of the refrigerant discharged from the discharge valve 64 toward the recess 4Ad is changed in only one step.

According to the manufacturing method of the rotary compressor 1 of this embodiment, the first recess 4Ad21 and the second recess 4Ad22 are formed by cutting the opposing surface 4Ab to form the slope 4Ad2, and the slope 4Ad2 is formed from the bottom 4Ad1 of the first recess 4Ad21. A rotary compressor 1 is manufactured in which the height H2 from the bottom 4Ad1 of the second recess 4Ad22 to the opposing surface 4Ab is lower than the height H1 from the opposing surface 4Ab. Therefore, the flow direction of the refrigerant discharged from the discharge valve 64 toward the recess 4Ad is arranged in at least two stages at the end of the first recess 4Ad21 and the end of the second recess 4Ad22 so that the flow direction of the refrigerant discharged from the discharge valve 64 approaches the opposite surface 4Ab from the bottom 4Ad1. Be changed. Therefore, the pressure loss of the refrigerant can be further suppressed compared to the case where the flow direction of the refrigerant discharged from the discharge valve 64 toward the recess 4Ad is changed only in one step at the end of the recess 4Ad.

According to the method for manufacturing the rotary compressor 1 of this embodiment, since the diameter D2 of the second recess 4Ad22 is the same as the diameter D1 of the first recess 4Ad21, the opposing surface 4Ab of the upper bearing 4A is cut to form the first recess. When forming 4Ad21 and the second recess 4Ad22, the same cutting tool can be used.

The rotary compressor (1) described in each embodiment described above can be understood, for example, as follows.

A rotary compressor according to a first aspect of the present disclosure includes a housing (2) having a cylindrical part extending in a vertical direction along an axis, and a compression part (6) housed in the housing and compressing a refrigerant. and a drive section (5) that drives the compression section by rotating a rotation shaft (3) that is housed in the housing and extends along the axis, and the compression section is fixed to the rotation shaft. a piston rotor (63) that rotates eccentrically with respect to the axis; a cylinder (60) that accommodates the piston rotor; a pair of bearings (4A, 4B) that are arranged to sandwich the cylinder and form a compression chamber (60A) that accommodates the piston rotor; a discharge valve (64) that opens and closes the discharge hole (4Aa) for discharging the compressed refrigerant; A recess (4Ad) for accommodating the valve is formed, the discharge hole penetrating along the axis is formed in the bottom (4Ad1) of the recess, and the discharge hole is formed in the recess to accommodate the valve. A sloped portion (4Ad2) is formed in which the height from the bottom portion to the opposing surface decreases as the distance from the hole increases.

According to the rotary compressor according to the first aspect of the present disclosure, the compression section is driven by the drive section rotating the rotating shaft. The compression section compresses the refrigerant by rotating a piston rotor within a compression chamber formed by sandwiching a cylinder between a pair of bearings, thereby gradually reducing the volume of the compression chamber. The compressed refrigerant is guided from the discharge hole through the discharge valve to the space where the drive unit is arranged.

According to the rotary compressor according to the first aspect of the present disclosure, the discharge valve is housed in the recess formed in the opposing surface facing the drive unit, and the compressed refrigerant is discharged from the discharge valve toward the recess. Ru. Since the inclined portion is formed in the recess, the flow direction of the refrigerant discharged from the discharge valve toward the recess is changed so that it approaches the opposite surface stepwise from the bottom. Therefore, the pressure loss of the refrigerant can be suppressed compared to the case where the flow direction of the refrigerant discharged from the discharge valve toward the recess is changed in only one step.

In the rotary compressor according to a second aspect of the present disclosure, in the first aspect, the discharge valve has a base end fixed to the bottom of the recess and a distal end disposed in the discharge hole, The inclined portion is formed along an extending direction from the base end to the distal end of the discharge valve.
According to the rotary compressor according to the second aspect of the present disclosure, since the inclined portion is formed along the extending direction from the base end to the distal end of the discharge valve, the discharge valve opens and refrigerant is guided. Along the stretching direction, the flow direction of the refrigerant can be changed from the bottom to the opposing surface in a stepwise manner.

In the rotary compressor according to a third aspect of the present disclosure, in the first aspect or the second aspect, when the opposing surface of the bearing is viewed along the axis, the inclined portion has a circular shape with the discharge hole as the center. a first recess (4Ad21) formed therein; and a second recess (4Ad22) formed in a circular shape centered on a position spaced from the discharge hole and arranged to overlap with the first recess, The height from the bottom of the first recess to the opposing surface is a first height, and the height from the bottom of the second recess to the opposing surface is a second height lower than the first height. It is.

According to the rotary compressor according to the third aspect of the present disclosure, the inclined portion has the first recess and the second recess, and the bottom of the second recess is lower than the first height from the bottom of the first recess to the opposing surface. The second height from the to the opposing surface is low. Therefore, the flow direction of the refrigerant discharged from the discharge valve toward the recess is changed in at least two stages: at the end of the first recess and at the end of the second recess, so that the flow direction of the refrigerant discharged from the discharge valve toward the recess approaches from the bottom to the opposing surface. Therefore, the pressure loss of the refrigerant can be further suppressed compared to the case where the flow direction of the refrigerant discharged from the discharge valve toward the recess is changed only in one step at the end of the recess.

In the rotary compressor according to a fourth aspect of the present disclosure, in the third aspect, the first diameter of the first recess is twice or more the diameter of the discharge hole.
According to the rotary compressor according to the fourth aspect of the present disclosure, by making the first diameter of the first recess twice or more the diameter of the discharge hole, the refrigerant discharged from the discharge hole is It is possible to prevent excessive pressure loss from occurring due to collision with a recess at a position less than twice as large.

In the rotary compressor according to a fifth aspect of the present disclosure, in the third aspect, the second diameter of the second recess is the same as the first diameter of the first recess.
According to the rotary compressor according to the fifth aspect of the present disclosure, since the second diameter of the second recess is the same as the first diameter of the first recess, the first recess and the second recess are formed on the opposing surfaces of the bearing. The same cutting tool can be used for machining.

In the rotary compressor according to a sixth aspect of the present disclosure, in the third aspect, the second diameter of the second recess is larger than the first diameter of the first recess.
According to the rotary compressor according to the sixth aspect of the present disclosure, since the second diameter of the second recess is larger than the first diameter of the first recess, compared to the case where the second diameter is made the same as the first diameter, It is possible to reduce pressure loss when the refrigerant collides with the end face of the second recess.

A method for manufacturing a rotary compressor according to a seventh aspect of the present disclosure is a method for manufacturing a rotary compressor, wherein the rotary compressor includes a housing having a cylindrical portion extending in a vertical direction along an axis. , a compression section that is housed in the housing and compresses the refrigerant, and a drive section that is housed in the housing and drives the compression section by rotating a rotating shaft that extends along the axis, the compression section includes a piston rotor that is fixed to the rotating shaft and rotates eccentrically with respect to the axis; a cylinder that accommodates the piston rotor; and a cylinder that rotatably supports the rotating shaft and rotates along the axis. a pair of bearings that are arranged to sandwich the cylinder and form a compression chamber that accommodates the piston rotor; and a discharge hole that is attached to one of the pair of bearings and that discharges the refrigerant compressed in the compression chamber. a discharge valve that opens and closes, and forming a recess for accommodating the discharge valve by cutting an opposing surface of one of the pair of bearings that faces the drive section; forming the discharge hole penetrating the bottom along the axis, and the step of forming the recess increases the height from the bottom to the opposing surface as the distance from the discharge hole increases. A sloped portion with a lower height is formed.

According to the method for manufacturing a rotary compressor according to the seventh aspect of the present disclosure, the step of forming the recess includes cutting the opposing surface facing one of the driving parts of the pair of bearings, and A sloped portion is formed in which the height from the bottom to the opposing surface decreases as the height increases. Since a recess with an inclined portion is formed by cutting, it is easier to manufacture a bearing with a smaller outer diameter (for example, Φ95 [mm] or less) than when a bearing with a recess is formed by casting. .

According to the rotary compressor manufactured by the method for manufacturing a rotary compressor according to the seventh aspect of the present disclosure, the discharge valve is accommodated in the recess formed in the facing surface facing the drive part, and the discharge valve is moved from the discharge valve to the recess. The compressed refrigerant is discharged towards. Since the inclined portion is formed in the recess, the flow direction of the refrigerant discharged from the discharge valve toward the recess is changed so that it approaches the opposite surface stepwise from the bottom. Therefore, the pressure loss of the refrigerant can be suppressed compared to the case where the flow direction of the refrigerant discharged from the discharge valve toward the recess is changed in only one step.

In the method for manufacturing a rotary compressor according to an eighth aspect of the present disclosure, in the seventh aspect, in the step of forming the recess, the opposing surface of the bearing is aligned along the axis by cutting the opposing surface. When viewed from above, a first recess is formed in a circular shape centered on the discharge hole, and a second recess formed in a circle centered at a position spaced from the discharge hole and arranged to overlap with the first recess. and the height from the bottom of the first recess to the opposing surface is the first height, and the height from the bottom of the second recess to the opposing surface is the first height. The second height is lower than the second height.

According to the method for manufacturing a rotary compressor according to the eighth aspect of the present disclosure, the first recess and the second recess are formed by cutting the opposing surfaces to form the inclined portion, and from the bottom of the first recess to the opposing surface. A rotary compressor is manufactured in which the second height from the bottom of the second recess to the opposing surface is lower than the first height. Therefore, the flow direction of the refrigerant discharged from the discharge valve toward the recess is changed in at least two stages: at the end of the first recess and at the end of the second recess, so that the flow direction of the refrigerant discharged from the discharge valve toward the recess approaches from the bottom to the opposing surface. Therefore, the pressure loss of the refrigerant can be further suppressed compared to the case where the flow direction of the refrigerant discharged from the discharge valve toward the recess is changed only in one step at the end of the recess.

In the method for manufacturing a rotary compressor according to a ninth aspect of the present disclosure, in the eighth aspect, the first diameter of the first recess is twice or more the diameter of the discharge hole.
According to the method for manufacturing a rotary compressor according to the ninth aspect of the present disclosure, by making the first diameter of the first recess twice or more the diameter of the discharge hole, the refrigerant discharged from the discharge hole is It is possible to prevent excessive pressure loss from occurring due to collision with a recess at a position less than twice the diameter.

In the method for manufacturing a rotary compressor according to a tenth aspect of the present disclosure, in the eighth aspect, the second diameter of the second recess is the same as the first diameter of the first recess.
According to the method for manufacturing a rotary compressor according to the tenth aspect of the present disclosure, since the second diameter of the second recess is the same as the first diameter of the first recess, the opposing surface of the bearing is cut to form the first recess. The same cutting tool can be used to form the second recess.

1 Rotary compressor 2 Housing 3 Rotating shaft 4A Upper bearing 4Aa Discharge hole 4Ab Opposing surface 4Ac Fastening hole 4Ad Recess 4Ad1 Bottom 4Ad2 Inclined part 4Ad21 First recess 4Ad22 Second recess 4Ad23 Third recess 4B Lower bearing 5 Electric motor (drive part )
6, 6A, 6B Rotary compression part 10 Compressor main body 11 Suction pipe 12 Accumulator 13 Discharge pipe 14 Bracket 15 Inlet pipe 21 Main body part 21a Inner surface 22 Upper lid part 23 Lower lid part 24 Opening part 25 Suction port 60 Cylinder

60A Compression chamber

60B Suction hole 61 Bolt 62 Eccentric shaft 63 Piston rotor 64 Discharge valve 64a Valve body 64a1 Base end 64a2 Tip 64b Retainer 64c Fastening bolt 65 Discharge cover CL Rotation axis FL Installation surface H, H1, H2, H3 Height HD Horizontal direction VD Vertical direction Z1, Z2 Axis

Claims

a housing having a cylindrical portion extending vertically along the axis;
a compression section that is housed in the housing and compresses the refrigerant;
a drive unit that is housed in the housing and drives the compression unit by rotating a rotating shaft that extends along the axis;
The compression section is
a piston rotor fixed to the rotating shaft and rotating eccentrically with respect to the axis;
a cylinder that accommodates the piston rotor;
a pair of bearings that rotatably support the rotating shaft around the axis and are arranged along the axis to sandwich the cylinder to form a compression chamber that accommodates the piston rotor;
a discharge valve that is attached to one of the pair of bearings and opens and closes a discharge hole that discharges the refrigerant compressed in the compression chamber;
A recess for accommodating the discharge valve is formed in an opposing surface of one of the pair of bearings that faces the drive unit;
The discharge hole is formed at the bottom of the recess and extends through the axis,
In the rotary compressor, the recess is formed with an inclined portion in which the height from the bottom portion to the opposing surface decreases as the distance from the discharge hole increases.
The discharge valve has a base end fixed to the bottom of the recess and a distal end disposed in the discharge hole,
The rotary compressor according to claim 1, wherein the inclined portion is formed along an extending direction from the base end to the distal end of the discharge valve.
When the opposing surface of the bearing is viewed along the axis, the inclined portion includes a first recess formed in a circular shape centered on the discharge hole, and a circular shape centered on a position spaced apart from the discharge hole. and a second recess arranged to overlap with the first recess,
The height from the bottom of the first recess to the opposing surface is a first height, and the height from the bottom of the second recess to the opposing surface is a second height lower than the first height. The rotary compressor according to claim 1 or claim 2.
The rotary compressor according to claim 3, wherein the first diameter of the first recess is twice or more the diameter of the discharge hole.
The rotary compressor according to claim 3, wherein the second diameter of the second recess is the same as the first diameter of the first recess.
The rotary compressor according to claim 3, wherein the second diameter of the second recess is larger than the first diameter of the first recess.
A method for manufacturing a rotary compressor, the method comprising:
The rotary compressor is
a housing having a cylindrical portion extending vertically along the axis;
a compression section that is housed in the housing and compresses the refrigerant;
a drive unit that is housed in the housing and drives the compression unit by rotating a rotating shaft that extends along the axis;
The compression section is
a piston rotor fixed to the rotating shaft and rotating eccentrically with respect to the axis;
a cylinder that accommodates the piston rotor;
a pair of bearings that rotatably support the rotating shaft around the axis and are arranged along the axis to sandwich the cylinder to form a compression chamber that accommodates the piston rotor;
a discharge valve that is attached to one of the pair of bearings and opens and closes a discharge hole that discharges the refrigerant compressed in the compression chamber;
forming a recess for accommodating the discharge valve by cutting an opposing surface of one of the pair of bearings that faces the drive section;
forming the discharge hole penetrating along the axis at the bottom of the recess;
In the method for manufacturing a rotary compressor, the step of forming the recess forms an inclined portion in which the height from the bottom to the opposing surface decreases as the distance from the discharge hole increases.
The step of forming the recess includes cutting the opposing surface to form a first recess that has a circular shape centered on the discharge hole when the opposing surface of the bearing is viewed along the axis; a second recess formed in a circle centered at a position spaced from the hole and arranged to overlap with the first recess, to form the inclined part;
The height from the bottom of the first recess to the opposing surface is a first height, and the height from the bottom of the second recess to the opposing surface is a second height lower than the first height. The method for manufacturing a rotary compressor according to claim 7.
The method for manufacturing a rotary compressor according to claim 8, wherein the first diameter of the first recess is twice or more the diameter of the discharge hole.
The method for manufacturing a rotary compressor according to claim 8, wherein the second diameter of the second recess is the same as the first diameter of the first recess.