JP2012072676A - Electric compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric compressor for sufficiently making both compatible in security of oil separability and miniaturization.SOLUTION: This electric compressor includes a main vessel 1 incorporated with a compression mechanism part 3 and an electric motor 2, an oil feeding device 14 arranged on a sidewall of the main vessel, and a discharge sub-vessel 6 installed via a sealant on the sidewall of the main vessel so as to cover the oil feeding device. The discharge sub-vessel has an oil storage chamber 10 in a lower part, and an oil reserving chamber 23 in a substantially central part for supplying oil to the oil feeding device via an oil suction passage 21 from the oil storage chamber. The electric compressor is constituted so that at least one oil separating jet port 8 is arranged in an upper part of the sidewall of the main vessel, and an oil separating chamber 9 is provided in a position corresponding to the oil separating jet port in an upper part of the discharge sub-vessel. Thus, an external shape of the main vessel is miniaturized, and even if a space in the main vessel is small, refrigerant gas jetting from the oil separating jet port arranged in the discharge sub-vessel, collides with an inner wall of the discharge sub-vessel, oil in the refrigerant gas is efficiently separated, and both the miniaturization and the oil separability can be made compatible.

Description

  TECHNICAL FIELD The present invention relates to a compression mechanism section that sucks, compresses and discharges fluid, and an electric compressor in which an electric motor that drives the compression mechanism section is built in a fuselage container.

  Various electric compressors of this type have been proposed (see, for example, Patent Document 1). FIG. 6 shows an electric compressor of Patent Document 1, which is a high-pressure type compressor that discharges refrigerant after the suction refrigerant is compressed by the compression mechanism 51 and then passes through the electric motor 52 to cool it. It has become a machine.

  In the electric compressor having this structure, the main container 53 in which the electric motor 52 is housed has a relatively large space volume excluding the electric motor 52, so that the oil in the discharged refrigerant gas is dropped by gravity at a place where the flow velocity is low. They are separated by colliding with the inner walls of the electric motor 52 and the main container 53.

  The separated oil passes through the oil suction passage 55 below the discharge sub-container 54 installed adjacent to the main container 53 and is stored in the oil reservoir chamber 56 in the center. In this structure, the oil is supplied by the rotation of the drive shaft 57. The gear pump 58 supplies oil into the compression mechanism 51 through the oil passage 59 in the drive shaft 57.

JP 2009-127465 A

  In the structure described in Patent Document 1, the oil in the gas is basically separated by using the empty space of the main container 53 in which the electric motor is accommodated, reducing the flow velocity, colliding with the winding portion of the electric motor 52, or the like. However, when the compressor is made smaller, the empty space in the motor chamber that houses the motor 52 becomes smaller, and it becomes difficult to reduce the flow rate sufficient for oil separation, and the installation of an oil separation wall is also possible. It becomes difficult.

  Further, when the discharge sub-container 60 is provided and the oil sump chamber 56 is disposed, it is necessary to dispose sealing materials between the outermost part of the oil reservoir chamber 56 and the outer periphery of the main container 53, which is expensive. become. In addition, if a standard O-ring is used as the outermost peripheral sealing material, it is cheap, but a bolt for fastening the main container 53 and the discharge sub-container 60 must be disposed outside the O-ring, and the seed container There is a problem that the outer diameter of 53 increases.

  Furthermore, when newly designing and installing a filter for a refueling device, it is necessary to pay attention not to increase the cost or to create a complicated structure.

  The present invention has been made in view of such a conventional problem, and aims to ensure both oil separation and miniaturization.

In order to achieve the above-mentioned object, the present invention provides a main container containing a compression mechanism section and an electric motor that drives the compression mechanism section, an oil supply device disposed on a side wall of the main container, and the main oil container so as to cover the oil supply apparatus. A discharge sub-container attached to the side wall of the container via a sealing material, and the discharge sub-container supplies oil to the oil supply device through the oil suction passage from the oil storage chamber to the lower portion of the oil storage chamber at the lower center. An electric compressor having an oil sump chamber for providing at least one oil separation jet on the top of the side wall of the main container, and the oil separation jet on the top of the discharge sub-container The oil separation chamber is provided at a position corresponding to the above.

  Thereby, even if the outer shape of the main container is reduced and the space in the main container is small, the refrigerant gas jetted from the oil separation jet port provided in the discharge sub container collides with the inner wall of the discharge sub container and the refrigerant gas Oil can be separated efficiently, and both downsizing and oil separation can be realized.

  The electric compressor according to the present invention can achieve both downsizing and oil separation in the refrigerant gas due to the presence of the oil separation jet port provided in the discharge sub-container and the oil separation chamber.

In the electric compressor, the present invention can reduce the cost demerits such as an increase in the sealing material when adopting the discharge sub-container structure, the expansion of the outer shape due to the projection of the bolt part, and the installation of a filter for the oil supply device, etc. according to the present invention, Concentrated on the discharge sub-container to be advantageous in terms of mold investment when changing the design of the layout of the oil piping, pressure relief valve, and compressor mounting leg that facilitates oil separation even in a small motor installation space By realizing a structure having a merit such as a structure, it is possible to obtain a low oil discharge electric compressor with a small and inexpensive structure.

Partial sectional view of the electric compressor according to Embodiment 1 of the present invention. Sectional drawing which shows the oil supply apparatus of the electric compressor Side view of the main container of the electric compressor Top view showing the integrated sealing material of the electric compressor The figure which shows the manufacturing process of the filter of the electric compressor Sectional drawing which shows the horizontal type electric compressor of a prior art example

  According to a first aspect of the present invention, there is provided a main container incorporating a compression mechanism section and an electric motor for driving the compression mechanism section, an oil supply device disposed on the side wall of the main container, and a seal on the side wall of the main container so as to cover the oil supply apparatus. A discharge sub-container attached via a material, the discharge sub-container having an oil storage chamber at a lower portion, and an oil sump chamber for supplying oil from the oil storage chamber to the oil supply device through an oil suction passage at a substantially central portion. An electric compressor having at least one oil separation jet at the upper part of the side wall of the main container, and at the position corresponding to the oil separation jet at the upper part of the discharge sub-container. The oil separation chamber is provided.

  Thereby, even if the outer shape of the main container is reduced and the space in the main container is small, the refrigerant gas jetted from the oil separation jet port provided in the discharge sub container collides with the inner wall of the discharge sub container and the refrigerant gas Oil can be separated efficiently, and both downsizing and oil separation can be realized.

  In the second aspect of the invention, the discharge sub-container has a discharge pipe installation portion in the outer wall portion communicating with the oil separation chamber, a compressor mounting leg in the central portion of the side wall, and a pressure relief valve in the lower peripheral wall portion When changing the design of the layout of the discharge piping, pressure relief valve and compressor mounting leg, it is only necessary to change the discharge sub-container side without changing the main container. Yes.

According to a third aspect of the present invention, the seal material is an integrated seal material integrally including an outermost peripheral seal portion and an inner peripheral seal portion, and the main container and the discharge sub-container are fastened with bolts arranged inside the outermost peripheral seal portion. As a configuration, an increase in the number of sealing materials as in the case of using separate sealing materials inside and outside and expansion of the outer shape due to the protrusion of the bolt part, etc. can be suppressed, and further downsizing and cost reduction can be realized.

  According to a fourth aspect of the present invention, the oil supply device has a filter, and the filter is formed by caulking and integrally forming a filter at the outer periphery of a disk-shaped metal plate having a step portion and an opening in the center. The device is fixed to the flat plate having the suction port of the fueling device, and the man-hour can be reduced and the cost can be reduced as compared with the case where the filter is welded to the outer peripheral portion of the disk-shaped metal plate.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a partial cross-sectional view showing an electric compressor according to Embodiment 1 of the present invention. In FIG. 1, an electric motor 2 is built in a main container 1, and a compression mechanism portion 3 that is fitted or press-fitted into the main container 1 is driven through a shaft 4. The main container 1 is formed in a substantially cylindrical shape having a side wall 7 on the electric motor 2 side. The side wall 7 side is closed by a discharge sub-container 6, and the compression mechanism section 3 side has a suction sub-container 5 having a suction passage 5a. It is blocked by.

  The refrigerant gas compressed by the compression mechanism unit 3 collides with the winding portion of the electric motor 2 and the wall of the main container 1 while cooling the electric motor 2 and flows while separating the oil component in the gas, The oil flows out from a plurality of oil separation jets 8 arranged at the upper part of the side wall 7 and collides with the wall of the oil separation chamber 9 partitioned by the upper part of the discharge sub-container 6. Here, the spray-like oil component is divided into a plurality of jet ports 8 and is condensed by jetting into the oil separation chamber 9 and colliding with the inner wall surface thereof, and is separated from the refrigerant gas to become a liquid and travels through the wall portion and gravity. The oil flows down to the lower portion and is stored in the oil storage chamber 10 provided at the lower portion of the discharge sub-container 6. On the other hand, the refrigerant gas from which the oil component has been separated flows out of the compressor from the discharge port 12 of the discharge pipe mounting portion 11 provided on the upper outer wall of the discharge sub-container 6.

  The shaft 4 passes through the rotor 2a of the electric motor 2, and is supported by the bearing 13 on the shaft 4a. Further, the end portion 4b of the shaft 4a passes through the side wall 7 of the main container 1, and the side wall 7 has a discharge sub container 6 side. Is driven.

  FIG. 2 is a detailed sectional view of the fueling device 14. The oil supply device 14 forms a recess in the side wall 7, and is disposed in the recess 7. The space formed between the pump rotor 15 driven by the end 4 b of the shaft and the pump follower 16 paired with the pump rotor 16. Oil is sucked in by increasing and decreasing, and is pumped into an oil passage 4 c formed inside the shaft 4. The concave portion of the side wall 7 is closed by a pump plate 17 in which a suction port 17a and a discharge port 17b are formed, and a filter 19 having a mesh filter 18 for filtering dust and foreign matters is disposed upstream of the suction port 17a. The entire circumference is welded and fixed to the flat pump plate 17 by the welded portion 20.

  Returning to FIG. 1, the other detailed structure of the discharge sub-container 6 will be described.

  Lubricating oil stored in the oil storage chamber 10 at the lower part of the discharge sub-container 6 is sucked by the oil supply device 14, and enters an oil sump chamber 23 formed by a partition wall 22 from the oil suction passage 21 at the center of the discharge sub-container 6. Inflow. Then, it is sucked into the aforementioned oil supply device 14.

  Next, the outer wall structure of the discharge sub-container 6 will be described.

The above-described discharge pipe mounting portion 11 is disposed at the upper portion of the discharge sub-container 6, but one of the compressor mounting legs 24 is disposed at the center portion of the outer wall. Furthermore, a pressure relief valve 25 is installed on the lower outer wall of the discharge sub-container 6. These parts and parts vary in size, position, direction, etc. depending on the user's request. Therefore, in order to improve design change efficiency, they are concentrated on this discharge sub-container. It can be handled by changing the type. Therefore, the main container 3 can be forced and cost reduction can be realized.

  FIG. 3 is a side view of the main container 1 as viewed from the discharge sub-container 6 side according to the embodiment of the present invention, and FIG. 4 shows the shape of an integrated sealing material disposed between the main container 1 and the discharge sub-container 6. Is shown. In FIG. 3, an oil supply device 14 is fixed to a flat portion at a central portion of the side wall 7 of the main container 1 by a bolt, and for sealing with a partition wall 22 forming an oil reservoir 23 of the discharge sub-container 6 on the outer peripheral portion thereof. A joining surface 26 is formed. Further, a flat portion 27 is formed on the outermost peripheral portion of the side wall 7 so as to hermetically seal between the outer peripheral portion of the discharge sub-container 6.

  Next, four screw holes 28 that do not penetrate inside are disposed inside the outer peripheral flat portion 27 of the side wall 7, and the main container 1 and the discharge sub-container 6 are fastened by bolts screwed into the screw holes 28. The And since this bolt fastening part is inside the outermost peripheral seal part by the sealing material 29 demonstrated below, the expansion of the external shape by the protrusion of a bolt part, etc. are suppressed, and further size reduction can be accelerated | stimulated.

  4 is inserted between the main container 1 and the discharge sub-container 6, the outer peripheral part 30 of the sealing material is the outermost peripheral part of both containers, and the inner peripheral part 31 is the partition wall of the oil reservoir 23. 22 joint surfaces are sealed. Reference numeral 32 denotes a bolt hole, and an outer peripheral portion and an inner peripheral portion are integrated at a connecting portion 33. Therefore, it is possible to provide a low cost by suppressing an increase in the number of sealing materials as in the case of using separate inner and outer sealing materials and an increase in assembly man-hours associated therewith. In addition, although the packing type which has an uneven | corrugated | grooved part is recommended for this sealing material, you may form a groove part and insert an O-ring.

FIG. 5 is a diagram showing a manufacturing process of the filter 19 used in the fueling device 14.
In the filter 19, first, a circular metal plate 30 a shown at the left end is punched out in the next step with a circular opening 31 a at the center, and the stepped portion 31 and the outer peripheral portion shown in the figure are bent 90 degrees, and the collar portion 30 b is bent. It is formed. Next, the circular mesh filter 32 covers the opening 31a, and the outer peripheral end extends to the collar 30b. In the next step, the outer flange portion 30b sandwiches the mesh filter 32 and is further bent 90 degrees to form a crimped portion 32c. Therefore, compared with the case where the outer periphery of the mesh filter 32 is welded to the outer peripheral portion of the disk-shaped metal plate 30a, man-hours can be reduced and the cost can be reduced accordingly.

  In addition, although the said filter 19 illustrated the case where the disk-shaped metal plate 30a was welded to the pump plate (flat plate) with a suction port all around, if it can seal, brazing, bolt fixation using a sealing material, etc. may be sufficient. .

  As described above, the electric compressor according to the present invention can achieve both downsizing and oil separation in the refrigerant gas due to the presence of the oil separation jet port and the oil separation chamber provided in the discharge sub-container.

DESCRIPTION OF SYMBOLS 1 Main container 2 Electric motor 3 Compression mechanism part 6 Discharge sub container 8 Oil separation jet 9 Oil separation room 10 Oil storage room 19 Filter 21 Oil intake passage 23 Oil sump room 29 Integrated seal material 30c Caulking part
32 Bolt hole

Claims (4)

A main container containing a compression mechanism section and an electric motor that drives the compression mechanism section, a fueling device disposed on the side wall of the main container, and a side wall of the main container that is attached to the side wall of the main container so as to cover the fueling device A discharge sub-container, and the discharge sub-container is an electric compressor having an oil reservoir chamber at a lower portion and an oil reservoir chamber for supplying oil to the oil supply device from the oil reservoir chamber through an oil suction passage at a substantially central portion. In addition, at least one oil separation jet port is provided on the upper portion of the side wall of the main container, and an oil separation chamber is provided on the upper portion of the discharge sub-container at a position corresponding to the oil separation jet port. Electric compressor. 2. The electric motor according to claim 1, wherein the discharge sub-container has a discharge pipe installation portion in an outer wall portion communicating with the oil separation chamber, a compressor mounting leg in a central portion of the outer wall, and a pressure relief valve in a lower peripheral wall portion. Compressor. The seal material is an integrated seal material integrally including an outermost peripheral seal portion and an inner peripheral seal portion, and is fastened with a bolt disposed inside the outermost seal portion of the main container and the discharge sub-container. The electric compressor as described. The oil supply device has a filter, and the filter is formed by caulking and integrally forming a filter at the outer peripheral portion of a disk-shaped metal plate having a step portion and an opening at the center. The electric compressor according to any one of claims 1 to 3, wherein the electric compressor is fixed to a flat plate having a suction port.