JPH0196490A - Oiling pump device for horizontal compressor - Google Patents

Abstract

PURPOSE:To pump up securely oil from an oil reservoir by mounting a thrust support member having an oil connecting path for supplying oil on the opening end face sides of a yoke and rotor. CONSTITUTION:On the axial end of a drive shaft 4 is mounted a cylindrical rotor 54 having the axis of the drive shaft 4 and the eccentric axis. The rotor 54 is formed on the outer peripheral portion with an intake port 54b and a discharge port 54c. A thrust support section 55 provided with an oil connecting path 55a for connecting oil from an oil reservoir 1a to the intake port 54b is supported through an urging means 56 at the opened end face side. Thus, no oil leaks between the intake port 54b and oil connecting path 55a.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides a horizontally placed casing with a compression element and a motor having a drive shaft for driving the compression element, and an axial center of the drive shaft. The present invention relates to an oil supply pump device for a horizontal compressor, which pumps oil from an oil reservoir in the casing into an oil supply passage formed inside the casing.

(Prior Art) Conventionally, as disclosed in, for example, Japanese Patent Laid-Open No. 60-73083, oil supply pump devices for compressors have been known to pump oil into the drive shaft using centrifugal force accompanying the rotational drive of the drive shaft. There is a so-called centrifugal pump type in which oil is pumped up from an oil reservoir into an oil supply passage to supply oil to lubricated parts such as bearing parts of the drive shaft.

However, in this centrifugal pump type, the amount of oil pumped into the oil supply passage is proportional to the square of the rotation speed of the drive shaft, so the compression capacity is adjusted by changing the rotation speed using, for example, inverter control. In such a case, the amount of oil supplied is
It changes like a quadratic curve with respect to the rotation speed.

Therefore, when operating in a high rotation range, the amount of oil supplied increases significantly, leading to over-lubrication of each lubricating point, and excessive oil supply increases the amount of oil mixed into the discharged gas, causing problems with oil drainage. This results in problems such as the generation of water and a drop in the oil level in the oil sump. On the other hand, when operating in a low rotation range, the amount of oil supplied is insufficient, resulting in a problem of poor lubrication at various lubrication points.

Therefore, in order to solve the above problems, we have previously installed a constant displacement pump function that linearly increases the oil supply Q in direct proportion to the rotation speed, and has been able to perform excessive oil supply when operating in a high rotation range. We have proposed a refueling pump device that can reliably refuel at low rotation speeds. (Tokugan Sho 6
No. 1-236451, October 3, 1986) However, as shown in FIG. , a cylindrical rotor (54) having an axis eccentric to the axis of the drive shaft (4) is attached.
) is fitted with a yoke (52) forming a pump chamber (52a) therein, and the rotor (54) is provided with a suction port (54b) for sucking oil into the pump chamber (52a). , and a discharge port (54c) for discharging the oil sucked into the pump chamber (52a) into the oil supply passage (41) of the drive shaft (4). It has an oil intake hole (a) that communicates with the port (54b), and the yoke (52
) is fixed via a bolt (B) to a closing plate (A) that receives the pump chamber (52a) and closes the pump chamber (52a).

With the above configuration, an amount of oil corresponding to the volume of the pump chamber (52a) is pumped up with one rotation of the drive shaft (4), and the number of rotations of the drive shaft (4) is linearly increased. This made it possible to obtain a constant volume of oil supply proportional to the amount of oil supplied.

(Problems to be Solved by the Invention) By the way, when the above-described oil supply pump device is applied to a vertical compressor, the suction port of the rotor (54)
(54b) faces into the oil level of the oil reservoir provided in the casing, so there is no problem. However, when applied to a horizontal compressor, the suction port (54b) of the rotor (54) ) is separated from the oil surface of the oil sump, an oil reading pipe or the like extending from the oil surface to the suction port (54b) is separately prepared in order to pump oil from the oil surface to the suction port (54b). Then, it becomes necessary to connect this to the oil intake hole (a) of the closing plate (A).

In this case, since the closing plate (A) is fixed to the rotor (54) and rotates together with the drive shaft (4), the oil reading pipe etc. is provided with an oil intake hole (a). Closing plate (A)
Therefore, special consideration must be taken when fixing this type of connecting pipe.

In other words, if there is a gap in the oil supply path when connecting the oil, it will cause an oil stagnation, which is fatal for the oil supply pump.Also, in order to eliminate the gap, the machining system of the sliding parts with each part must be changed. It is not a good idea to increase the altitude from a cost standpoint.

Therefore, in the present invention, we devised the application of a constant displacement pump to a horizontal compressor, and provided an oil connection path on the open end surface between the yoke and the rotor to supply oil from the oil reservoir to the suction port of the rotor. By attaching a thrust support member and thrust-supporting the rotor and yoke with the support member, the horizontal compressor is capable of reliably pumping oil from the oil sump without causing oil leakage. The object of the present invention is to provide a fuel pump device.

(Means for Solving the Problems) As shown in the embodiments of the drawings, the present invention provides a horizontal casing (1), a compression element (2), and a compression element (2).
It has a drive shaft (4) for driving a motor (3) and a refueling passage (41) formed in the axial center of the drive shaft (4).
) is an oil supply pump device for a horizontal compressor configured to pump oil from an oil reservoir (1a) of the casing (1), the drive shaft (4) having a drive shaft (4) at an end thereof; A cylindrical rotor (54) having an axis eccentric from the axis of 4) is installed, and a yoke (52) forming a pump chamber (52a) inside is fitted to the outer circumference of the rotor (54). , a suction port (54b) that causes the rotor (54) to suck oil into the pump chamber (52a);
) and a discharge port (54c) for discharging the oil sucked into the oil supply passage (41), and an oil connection passage (55a) for connecting the oil from the oil sump (1a) to the suction port (54b). ), and forms a thrust support member (55) that contacts the open side end surfaces of the rotor (54) and the yoke (52) to close the pump chamber (52a), and the thrust support member ( 55) is supported on the open end surface side via a biasing means (56).

(Function) However, in the above oil supply pump device, the shaft end of the drive shaft (4) has an eccentric shaft portion that is eccentric with respect to the axial center of the drive shaft (4), and the eccentric shaft portion inhalation bo) (54
b) and a rotor (54c) formed with a discharge bow) (54c).
) is attached, and a yoke (52) having a pump chamber (52a) is attached to the outer periphery of the eccentric shaft portion of the rotor (54).
The rotor (54) is fitted into the pump chamber (52a) of the yoke (52) as the drive shaft (4) is driven to rotate.
) by eccentrically rotating the rotor (54).
In other words, with one rotation of the drive shaft (4), an amount of oil corresponding to the volume of the pump chamber (52a) is pumped up, and a constant volume of oil is supplied that is linearly proportional to the number of rotations of the drive shaft (4). The quantity can be obtained.

Further, a suction port (54) of the rotor (54) is provided on the open end surface side of the yoke (52) and the rotor (54).
b) and a thrust support member (55a) that communicates with the oil reservoir (1a) of the casing (1).
55) is attached via the biasing means (56), and the support member (55) supports the yoke (52) and rotor (54) in a suppressed manner.
) and the oil connection path (55a), and the oil in the oil reservoir (1a) can be reliably pumped up to the oil supply path (41) of the drive shaft (4). .

(Embodiments) The oil supply pump device for a horizontal compressor according to the present invention will be described below with reference to embodiments of the drawings.

Figure 9 shows the overall structure of a horizontally installed scroll compressor, in which a first bridge (11) and a second frame (12) are assembled on both left and right sides of a horizontally installed casing (1), respectively. A compression element (2) consisting of a fixed scroll (21) and a revolving scroll (22) is supported on the first frame (11), and a motor (3) is installed between each of the bridges (11) and (12). On the other hand, this motor (3) and the compression element (2) are interlocked and connected via a drive shaft (4) that is laterally supported by a bearing on each of the frames (11) and (12). The rotation of the drive shaft (4) in conjunction with the drive of the motor (3) causes the orbiting scroll (22) in the compression element (2) to revolve around the fixed scroll (21), so that both scrolls (21) (22 ) to compress the refrigerant gas.

The casing (1) has leg bodies (13) and (14) of different heights attached to both sides in the length direction on the lower side thereof, so that the side on which the compression element (2) is attached is at a higher level, and the oil supply pump described later is attached. The installation side of the device (5) is installed at a lower level.

Furthermore, a refueling pump device (5) is installed on the end of the drive shaft (4) opposite to the compression element (2), that is, on the lower side of the casing (1). An oil sump (1) provided at the inner bottom of the casing (1) through
The oil in a) is pumped up into an oil supply passage (41) formed through the axial center of the drive shaft (4), and from the oil supply passage (41), the oil is pumped up to the drive shaft (4) and each of the bridges (11). (12), the bearings of the drive shaft (4) and the revolving scroll (22), and other lubricated locations are supplied with the oil.

Therefore, the oil supply pump device (5) used in the above-described horizontal compressor was constructed as follows.

As shown in detail in FIGS. 1 and 2, the refueling pump device (5) includes a pump housing (51) that is fixedly supported on the outer end surface of the second bridge (12) via a fixed pole (B). ) and a pump chamber (52
a), a yoke (52) supported by the pump housing (51) so that it can freely reciprocate only in the short diameter direction of the pump chamber (52a), and a connecting cylinder on the shaft end side of the drive shaft (4). (53) and rotated eccentrically within the pump chamber (52a) of the yoke (52) (54)
b) and a cylindrical rotor (54) having a discharge port (54c), and a suction port of the rotor (54) is provided inside on the external open side of the rotor (54) and the yoke (52). (54b) and the oil sump (
a thrust support member (55a) having an oil connection path (55a) communicating with the rotor (54) and the yoke (52) and closing the pump chamber (52a) by contacting the outer end surfaces of the rotor (54) and the yoke (52);
55) is attached, and this thrust support member (55) is moved between the a-ta (54) and the yoke (55) via the biasing means (56).
These rotors (54) are pressed against the outer end surfaces of the rotors (52) and
The yoke (52) and the support member (55) are thrust supported in a compressed manner by the end face of the support member (55).

The housing (51) consists of a cylindrical housing body (51a), and the housing body (51a) has a cylindrical shape.
The insertion hole (5l b) of the fixing pole (B) is formed through the housing body (51a), and guide grooves (51c) are formed in the shaft end side of the housing body (51a) so as to face each other in a radially outward direction. Form each.

Further, as is clear from FIG. 3, the yoke (52) is
Inside thereof, a pump chamber (52a) having a laterally long oval shape is formed by having semicircular parts on both sides in the transverse direction and connecting the semicircular parts with a straight part, and the yoke (52a) ), a support piece (52b) (52b
), and each support piece (52b) is inserted into each guide groove (51c) of the housing (51), and these guide grooves (51c) allow the yoke (52) to is guided back and forth only in the minor axis direction of the pump chamber (52a).

Furthermore, as shown in detail in FIGS. 4 and 5, the rotor (54) is integrally formed with an eccentric portion (54a) eccentric to the axial center of the drive shaft (4) on the axially outer side. death,
The eccentric portion (54a) is connected to the pump chamber (
52a), and by eccentrically rotating the eccentric part (54a) within this pump chamber (52a), while moving the yoke (52) in the short axis direction of the pump chamber (52a), The eccentric part (54a) is reciprocated in the long diameter direction of the pump chamber (52a) to suck in and discharge oil, and the eccentric part (54a) is moved on the outer end surface side of the eccentric part (54a). A suction bow (54b) is provided concentrically with the axis, and the eccentric portion (54a)
A discharge port (54c) is provided on the outer peripheral surface of the rotor (54), while a suction port (54c) is provided inside the rotor (54).
4b) and extends radially outward from the inside; and a discharge port (54C) that communicates with the discharge port (54C) and opens into the oil supply passage (41) of the drive shaft (4). A passage (54e) is formed.

Further, as shown in detail in FIG. 6, the thrust support member (55) provided on the outer end surfaces of the yoke (52) and the rotor (54) has a central portion connected to the suction port (54b) of the rotor (54). An oil connection path (55a) consisting of a small-diameter oil hole (55e) and a large-diameter seat hole (55f) that communicate with each other is formed through the oil connection path (55a), and the thrust support member ( An annular circumferential groove (55b) is provided on the outer end surface side of the thrust support member (55), and a pin groove (55c) is provided at an intermediate portion between the circumferential groove (55b) and the connection path (55a). ) on the outer wall surface of
A fitting groove (55d) for an O-ring (R), which will be described later, is formed.

Furthermore, a lid (57) for holding the support member (55) is attached to the outer side of the thrust support member (55), and this lid (57) has a shape as shown in FIG. , on the side facing the thrust support member (55),
A fitting hole (57a) into which the support member (55) can be inserted.
and an oil connection path (5) of the support member (55).
forming a communication hole (57b) that communicates with 5a), and opening the communication hole (57b) to the outer peripheral wall surface of the lid (57);
An oil supply pipe (58) facing the oil reservoir (1a) of the casing (1) is connected to this open end, and the support member (55) is connected to the communication hole (57b) through the oil supply pipe (58). The oil in the oil reservoir (1a) is pumped up into the oil connection path (55a).

Further, a pin groove (55c) of the thrust support member (55) is provided on a wall surface of the cover body (57) opposite to the fitting hole (57a).
), and a flange (57c) extending radially outward on the outer peripheral wall surface of the lid (57).
57d), and the fixed pole) is provided on the flange (57d).
The insertion hole (57e) shown in (B) is formed.

Then, with the thrust support member (55) inserted into the fitting hole (57a) of the lid (57), the lid (
By screwing the fixing bolt (B) into the second frame (12) from the insertion hole (57e) provided in the flange (57d) of the housing (51) through the insertion hole (51b) of the housing (51). , the lid (57) and the housing (51) are assembled to the second frame (12).

Further, the thrust support member (55) is connected to the yoke (52).
) and the rotor (54), a coil spring (56) is used as the biasing means (56) to bias the coil spring (56
) is interposed between the circumferential groove (55b) of the support member (55) and the lid (57), and the coil spring (56) connects the support member (55) to the yoke (52) and the rotor. (
54) to thrust-support the yoke (52) and rotor (54), thereby sealing the pump chamber (52a).

Furthermore, a pin groove (
55c) and a pin groove (57c) provided in the lid (57).
) is inserted between the locking pin (P) to integrally connect the support member (56) to the lid (57) side, and the fitting groove of the support member (55) (55d
) is interposed with an OU ring (R), and the ring (R) seals between the support member (55) and the lid (57) to prevent oil leakage from occurring between the two. It is to prevent it.

Next, the operation of the oil supply pump device (5) configured as described above will be explained based on FIG. 8.

First, as shown in (A) of the same figure, the rotor (54
) is rotated in the direction of the arrow so that the yoke (52) is located at the lowest position, the eccentric portion (54a) of the rotor (54) is located between the pump chambers (52a) in the yoke (52). The eccentric portion (54
A right chamber (A) and a left chamber (B) of a predetermined size are formed on both sides of the pump chamber (52a) in the lateral direction centering on a), and on the right chamber (A) side, the casing ( 1)
The oil in the oil sump (1a) in the oil supply pipe (58), the communication hole (57b) of the lid (57), the oil connection path (55a) of the thrust support member (55), and the rotor (54) ) and suction passage (54b).
(54c)
and the oil supply passage (41) of the drive shaft (4) via the discharge passage (54e), and oil is discharged from the left chamber (B) to the oil supply passage (41). A
), the right ventricle (a) is in the process of sucking in lubricating oil, and the left ventricle (b) is in the middle of discharging lubricating oil.

As shown in the second part (B), when the yoke (52) is moved upward from the lowermost position due to the rotation of the rotor (54), the eccentric portion (5) of the rotor (54)
4a), the left ventricle (b) of the pump chamber (52a) is occluded, and the right ventricle (a) becomes enlarged, so that the left ventricle (b) completes the discharge of lubricating oil, and the right ventricle In (a), inhalation of oil is completed.

Furthermore, as shown in FIGS. (B) to (C), when the yoke (52) is positioned at the uppermost position due to the rotation of the rotor (54), the eccentric portion (54a) of the rotor (54) ) is located at an intermediate portion of the pump chamber (52a) in the yoke (52), the suction port (54b) is communicated with the left chamber (b) side, and the right chamber (a) side is connected to the discharge port. (54c), therefore, in the case of the above figure (C), the left ventricle (b) side is in the process of sucking in oil, and the right ventricle (a)
The side is in the process of discharging oil.

Further, as shown in FIGS. (C) to (D), when the yaw (52) is moved downward from the uppermost position due to the rotation of the rotor (54), the rotor (54) is moved downward from the uppermost position.
4), the eccentric portion (54a) of the pump chamber (52a)
), the right ventricle (a) is occluded, and the left ventricle (b) becomes enlarged, so the right ventricle (a) completes discharging oil,
Also, inhalation of oil is completed in the left ventricle (b).

As explained above, the pump chamber (5) of the yoke (52)
2a), the eccentric portion (54a) of the rotor (54) is rotated eccentrically, so that each rotation of the rotor (54), that is, the drive shaft (4), causes the left and right chambers (A) to rotate.
In (b), oil is repeatedly sucked in and discharged, resulting in constant volume operation.

In addition, in FIG. 9, (15) is the casing (1).
A compressed refrigerant discharge pipe connected to the compression element (2) side of (1)
B) is a refrigerant suction pipe connected to the motor (3) side of the casing (1).

(Effects of the Invention) As explained above, in the oil supply pump device for a horizontal compressor according to the present invention, the drive shaft (4) that drives the compression element (2)
) is attached with a cylindrical rotor (54) having an axis eccentric to the axis of the drive shaft (4), and a pump chamber (52a) is installed inside the outer periphery of this rotor (54). A yoke (52) forming the rotor (54) is fitted with a suction port (54b) for sucking oil into the pump chamber (52a), and a suction port (54b) for sucking oil into the pump chamber (52a). Discharge port (54) for discharging into the passage (41)
c), and an oil connection path (55a) that communicates the suction port (54b) with the oil reservoir (1a) of the casing (1), and the rotor (54) and the yoke (1a).
The pump chamber (52) is in contact with the open end surface of the pump chamber (52).
forming a thrust support member (55) for closing a);
Since this thrust support member (55) is supported on the open end surface side via the biasing means (56), even though the compressor is of a horizontal type, the oil sump ( 1a) to the oil supply passage (41) of the drive shaft (4)
The oil in the oil sump (1a) can be reliably pumped into the oil supply passageway (41) without causing any oil leakage in the oil path leading to the oil passage.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing the main parts of the oil supply pump device according to the present invention, Fig. 2 is a cross-sectional view taken along line X-X in Fig. 1, Fig. 3 is a plan view of the yoke, and Fig. 4 is a bottom view of the rotor. 5 is a longitudinal sectional view of the same, FIG. 6 is a sectional view of the thrust support member, FIG. 7 is a sectional view of the lid, FIG. 8 is a drawing explaining the operating state of the oil supply pump device, and FIG. 9 1 is a longitudinal sectional view showing the overall structure of a compressor equipped with the same oil supply pump device, and FIG. 10 is a drawing explaining the process leading to the present invention. (1)...Casing (1a)...Oil sump (2)...Compression element (3)...Motor (4)...-Drive shaft (41) ...Oil supply passage (52) ...Yoke (52a) ...Pump chamber (54) ... -Rotor (54b) ...Suction port (54c) ...Discharge port (55) ... Thrust support member (55a), tension, oil connection path (56)... Is the biasing means unclear?

Claims (1)

[Claims] (1) A horizontal casing (1) is equipped with a compression element (2) and a motor (3) having a drive shaft (4) for driving the compression element (2), and the drive shaft (4) An oil supply pump device for a horizontal compressor, which pumps oil from an oil reservoir (1a) of the casing (1) into an oil supply passage (41) formed in the axis of the drive shaft (41). ) at the shaft end of
A cylindrical rotor (54) having an axis eccentric to the axis of the drive shaft (4) is attached, and a yoke (5) forming a pump chamber (52a) inside is attached to the outer circumference of the rotor (54).
2), and the pump chamber (
a suction port (54b) for sucking oil into the pump chamber (52a); and a suction port (54b) for sucking oil into the pump chamber (52a);
1), and an oil connection path (55a) for connecting oil from the oil sump (1a) to the suction port (54b); ) and the open side end surfaces of the yoke (52) to form a thrust support member (55) that closes the pump chamber (52a).
) is supported on the open end surface side via a biasing means (56).