Patent Description:
In order to meet customer's increasing requirements for a cooling and heating capacity of an air conditioner, a displacement of a rotary compressor of a rotation type is also designed to be relatively large. Due to limitation of a size of an external unit of the air conditioner, a diameter of a shell of the compressor should be as small as possible, which requires a height of the cylinder of the pump body to be designed be higher. Especially when exhaust ports need to be installed at both ends of the large-displacement cylinder, the exhaust ports are arranged on a baffle plate, and the baffle plate needs to be designed to be relatively high accordingly, resulting in a larger span of an eccentric portion of a crankshaft between two cylinders of the pump body.

In the related technology, two eccentric portions of the rotary compressor are in a suspended state. During the working process, due to excessive deflection between the two eccentric portions, the eccentric portions and rollers are inclined, which results in wear of the rollers and a head of a sliding vane, and greatly reduces the reliability of the compressor. In order to solve this kind of problem, in the related technology, an intermediate baffle plate bearing is usually arranged between the two eccentric portions of the crankshaft to provide support, so as to reduce the deflection between the eccentric portions of the crankshaft. However, a local stress of the baffle plate bearing is too large, which easily leads to bearing wear, reducing the service life of baffle plate bearing.

Patent application document No. <CIT> discloses a multi-cylinder rotary type compressor. A motor and a compression mechanism are arranged in a sealed shell; the compression mechanism comprises a first cylinder with a first piston, a second cylinder with a second piston and a middle isolation plate positioned between the first cylinder and the second cylinder; an eccentric crank shaft drives the first piston and the second piston to rotate simultaneously; a main bearing and an auxiliary bearing which are used for supporting the eccentric crank shaft are respectively arranged on a side face of the first cylinder and a side face of the second cylinder; the eccentric crank shaft comprises a main shaft, a first eccentric shaft connected with the first piston, a second eccentric shaft connected with the second piston and an auxiliary shaft; the first eccentric shaft is connected with the second eccentric shaft through a connection shaft; a middle shaft is arranged in the connection shaft; and the middle isolation plate is equipped with a middle bearing for supporting the middle shaft.

Patent application document No. <CIT> discloses a compressor compressing a refrigerant including hydrocarbon fluoride prone to disproportionation, the compressor comprising: a casing; a compression mechanism housed in the casing; an electric motor driving the compression mechanism; a drive shaft connecting the compression mechanism with the electric motor; a bearing portion rotatably supporting the drive shaft; and a heat generation suppression portion formed on a contact portion of the drive shaft and the bearing portion, the heat generation suppression portion suppressing excessive heat generation due to line contact of an end edge portion of the bearing portion with the drive shaft during rotation of the drive shaft.

Patent application document No. <CIT> discloses a compression mechanism for a multi-cylinder rotary type compressor. The compression mechanism comprises: a gas cylinder assembly and a crankshaft penetrating through the gas cylinder assembly in a vertical direction, the gas cylinder assembly comprises a plurality of gas cylinders arranged in a vertical direction, each cylinder is provided with a compression chamber, and a separation plate assembly is arranged between every two adjacent gas cylinders; and the crankshaft is provided with a plurality of eccentric portions separated from each other, each eccentric portion is positioned in the corresponding compression chamber, the separation plate assembly is positioned between two adjacent eccentric portions, a through hole is formed in the separation plate assembly to allow the crankshaft to pass through, and an inner surface of the through hole is arranged into a supporting surface for supporting the crankshaft.

In view of this, the present invention provides a pump body assembly, a compressor, and an air conditioner, which can reduce bearing wear problems caused by an excessive local stress and prolong service life of a baffle plate bearing.

In an aspect of the present invention, a pump body assembly is provided, including: a crankshaft comprising a first eccentric portion, a support shaft and a second eccentric portion which are arranged at intervals in an axial direction; a first baffle plate and a second baffle plate which are arranged in sequence between the first eccentric portion and the second eccentric portion. A first round hole is arranged on the first baffle plate, and the support shaft is arranged in the first round hole, so that the first baffle plate and the support shaft form a baffle plate bearing, and the baffle plate bearing has a stress relief structure for reducing a contact stress between the support shaft and the first baffle plate, and the stress relief structure includes a second flexible groove arranged on an end face of the first baffle plate facing toward the second baffle plate, and on an end face of the first baffle plate facing toward the second baffle plate, the second flexible groove is arranged on a side of the first baffle plate close to an inner edge of the first round hole.

In some embodiments, the stress relief structure includes a first flexible groove arranged on a side of the first baffle plate facing toward the first eccentric portion, and on an end face of the first baffle plate facing toward the first eccentric portion, the first flexible groove is arranged on a side of the first baffle plate close to an inner edge of the first round hole.

In some embodiments, the pump body assembly further includes a first cylinder, the first eccentric portion is arranged in the first cylinder, the first cylinder is also provided with a sliding vane groove; the first flexible groove has a starting position and an ending position along a rotation direction of the crankshaft, the sliding vane groove is located at a position of <NUM>°, an included angle α from the sliding vane groove to the starting position of the first flexible groove satisfies <NUM>°≤α≤<NUM>°, and the included angle α increases along the rotation direction of the crankshaft.

In some embodiments, an angle β from the starting position to the ending position of the first flexible groove satisfies <NUM>°≤α+β≤<NUM>°, and the angle β increases along the rotation direction of the crankshaft.

In some embodiments, a width d of the first flexible groove included in the first baffle plate satisfies <NUM>≤d≤<NUM>.

In some embodiments, an axial height H of the first baffle plate and a diameter D of the first round hole satisfy <NUM>≤H/D≤<NUM>.

In some embodiments, an exhaust port is arranged on the first baffle plate, and the exhaust port is arranged on a side of the first baffle plate close to the second baffle plate.

In some embodiments, the support shaft is provided with an oil guide hole along a radial direction, the crankshaft is provided with a central oil hole extending along an axial direction, and the oil guide hole communicates with the central oil hole.

In some embodiments, the stress relief structure includes a bearing bush arranged in the first round hole, and the bearing bush is sleeved outside the support shaft.

In some embodiments, one end of the first round hole close to the first eccentric portion is provided with an annular radial protrusion, and the bearing bush is stopped on the radial protrusion.

In some embodiments, a height of the first round hole is H, an installation height of the first round hole in cooperation with the bearing bush is H1, a height of the bearing bush is H2, and H2≤H1≤H; the height of the first round hole is a distance between an end surface, facing toward the first eccentric portion, of the first round hole and an end surface, facing toward the second baffle plate, of the first round hole; the height of the bearing bush is a distance between an end surface, facing toward the first eccentric portion, of the bearing bush and an end surface, facing toward the second baffle plate, of the bearing bush; and the installation height is a distance between an end surface, facing toward the first eccentric portion, of a portion and an end surface, facing toward the second baffle plate, of the portion, and the portion is a part of the first round hole.

In some embodiments, a side of the bearing bush is provided with a disconnection structure.

According to another aspect of the present invention, a compressor is provided, including the above pump body assembly.

According to another aspect of the present invention, an air conditioner is provided, including the above pump body assembly or the above compressor.

According to embodiments of the present invention, the pump body assembly includes a crankshaft, a first baffle plate and a second baffle plate, the crankshaft includes a first eccentric portion, a support shaft, and a second eccentric portion arranged at intervals in an axial direction, and the first eccentric portion and the second eccentric portion are arranged in sequence between the first eccentric portion and the second eccentric portion. A first round hole is arranged on the first baffle plate, and the support shaft is arranged in the first round hole, so that the first baffle plate and the support shaft form a baffle plate bearing, and the stress relief structure is arranged on the baffle plate bearing to reduce a contact stress between the support shaft and the first baffle plate. In the pump body assembly, the baffle plate bearing between the two eccentric portions can effectively support a middle of the crankshaft, greatly reducing deflection of the crankshaft, and avoiding problems of wear on a head of a slide plate and rollers caused by large deflection. The baffle plate bearing has the stress relief structure for reducing the contact stress between the support shaft and the first baffle plate, which can reduce the contact stress between the support shaft and an end edge of the first baffle plate when loads of the baffle plate bearing are too large, reducing the wear of the baffle plate bearing, improving reliability of the baffle plate bearing, and prolonging the service life of the baffle plate bearing.

Crankshaft; <NUM>. First flange; <NUM>. First muffler; <NUM>. First roller; <NUM>. First cylinder; <NUM>. First baffle plate; <NUM>. Second baffle plate; <NUM>. Second roller; <NUM> Second cylinder; <NUM>. Second flange; <NUM>. Second muffler; <NUM>. First eccentric portion; <NUM>. Support shaft; 13a. Oil guide hole; <NUM>. Second flexible groove; <NUM>. Second eccentric portion; <NUM>. First flexible groove; <NUM>. First round hole; <NUM>. Sliding vane groove; <NUM>. Disconnection structure; <NUM>. Bearing bush; <NUM>. Central oil hole; <NUM>. Exhaust port; and <NUM>. Radial protrusion.

Referring to <FIG>, according to an embodiment of the present invention, a pump body assembly includes a crankshaft <NUM>, a first baffle plate <NUM> and a second baffle plate <NUM>, and the crankshaft <NUM> includes a first eccentric portion <NUM>, a support shaft <NUM> and a second eccentric portion <NUM> which are arranged at intervals in an axial direction. The first baffle plate <NUM> and the second baffle plate <NUM> are arranged in sequence between the first eccentric portion <NUM> and the second eccentric portion <NUM>. A first round hole <NUM> is arranged on the first baffle plate <NUM>, and the support shaft <NUM> is arranged in the first round hole <NUM>, so that the first baffle plate <NUM> and the support shaft <NUM> form a baffle plate bearing, and the baffle plate bearing has a stress relief structure for reducing a contact stress between the support shaft <NUM> and the first baffle plate <NUM>.

In the pump body assembly, the baffle plate bearing between the two eccentric portions can effectively support a middle of the crankshaft <NUM>, greatly reducing deflection of the crankshaft <NUM>, and avoiding problems of wear between a head of a slide plate and rollers caused by large deflection. The baffle plate bearing has the stress relief structure for reducing the contact stress between the support shaft <NUM> and the first baffle plate <NUM>, which can reduce the contact stress between the support shaft <NUM> and an end edge of the first baffle plate <NUM> when loads of the baffle plate bearing are too large, reducing the wear of the baffle plate bearing, improving reliability of the baffle plate bearing, and prolonging service life of the baffle plate bearing <NUM>.

In some embodiments, the stress relief structure includes a first flexible groove <NUM> arranged on a side of the first baffle plate <NUM> facing toward the first eccentric portion <NUM>, and on an end face of the first baffle plate <NUM> facing toward the first eccentric portion <NUM>, the first flexible groove <NUM> is arranged on a side of the first baffle plate <NUM> close to the inner edge of the first round hole <NUM>. In this embodiment, by arranging the first flexible groove <NUM>, an easily deformable structure can be formed on a first side of the first baffle plate <NUM> close to the first eccentric portion <NUM>, so that when a contact stress between the first side of the first baffle plate <NUM> and the support shaft <NUM> is too large, the first baffle plate <NUM> can be deformed at the contact position due to the first flexible groove <NUM>, relatively reducing the contact stress here, reducing the wear of the baffle plate bearing, improving the reliability of the baffle plate bearing, and extending the service life of baffle plate bearing.

The first flexible groove <NUM> here means that by arranging a groove structure at the position of the first baffle plate <NUM> close to the inner edge of the first round hole <NUM>, the first baffle plate <NUM> is divided into inner and outer parts by using the groove structure, and the thickness of the part arranged inside the groove structure is thin; when the first baffle plate <NUM> receives a large contact stress at this position, the structure at this position is prone to deformation due to the thinning of the groove structure, thereby increasing the flexibility of the first baffle plate <NUM> at this position, and thus the contact stress of the first baffle plate <NUM> at this position can be reduced due to the increased flexibility.

In order to ensure the stress-reducing effect of the first flexible groove <NUM>, the first flexible groove <NUM> should be as close as possible to the surrounding wall of the first round hole <NUM>, and in order to ensure that the inner structure of the first flexible groove <NUM> has a certain supporting effect, the thickness of first baffle plate <NUM> arranged on the inner side of the first flexible groove <NUM> cannot be infinitely small. In some embodiments, the thickness of the first baffle plate <NUM> inside the first flexible groove <NUM> is <NUM>-<NUM>.

The pump body assembly also includes a first cylinder <NUM>, a first eccentric portion <NUM> is arranged in the first cylinder <NUM>, the first cylinder <NUM> is also arranged with sliding vane groove <NUM>, and along the rotation direction of crankshaft <NUM>, the angle between a starting position of first flexible groove <NUM> and sliding vane groove <NUM> is α, and <NUM>°≤α≤<NUM>°, which can make the angle difference between the first flexible groove <NUM> and the sliding vane groove <NUM> sufficient. According to the force analysis of intermittent suction and discharge of the compressor, this structural design can effectively avoid gas leakage at the first flexible groove <NUM> during the operation of the compressor, and improve the reliability of the compressor during operation.

In some embodiments, the angle β between the starting position and an ending position of the first flexible groove <NUM> satisfies <NUM>°≤α+β≤<NUM>°, the ending position of the first flexible groove <NUM> can be limited according to that the included angle between the starting position of the first flexible groove <NUM> and the sliding vane groove <NUM> is α, so that both the starting position and the ending position of the first flexible groove <NUM> can be in a suitable position, and the problem of gas leakage of the first flexible groove <NUM> can be avoided more effectively.

In some embodiments, when the first baffle plate <NUM> includes the first flexible groove <NUM>, the width d of the first flexible groove <NUM> satisfies <NUM>≤d≤<NUM>, which can make the first flexible groove <NUM> have sufficient deformation width and effectively reduce the structural strength of the first baffle plate <NUM> at this position, ensuring that the first baffle plate <NUM> inside the first flexible groove <NUM> can have sufficient deformation capacity, and improving the stress reduction effect of the first flexible groove <NUM> on the first side of the first baffle plate <NUM>.

The first flexible groove <NUM> is an arc-shaped groove, and the center of the arc-shaped groove coincides with the axis of the support shaft <NUM>, so that the structure of the first flexible groove <NUM> matches the structure of the support shaft <NUM>, so a better matching effect is formed between the stress relief structure formed by the first flexible groove <NUM> and the support shaft <NUM>, which further reduces the wear caused by stress during the working process of the baffle plate bearing.

In some embodiments, the axial height H of the first baffle plate <NUM> and the diameter D of the first round hole <NUM> satisfy <NUM>≤H/D≤<NUM>. When the first baffle plate <NUM> is too thick, the contact stress of edges of the baffle plate bearing will become larger, which will have an adverse effect on the reliability of the bearing. If the first baffle plate <NUM> is too thin, the baffle plate bearing will not have a good supporting effect on the crankshaft <NUM>, so the height H of the first baffle plate <NUM> and the diameter D of the inner round hole must satisfy the relationship: <NUM>≤H/D≤<NUM>, so as to avoid excessive contact stress at both ends of the baffle plate bearing due to the excessive thickness of the first baffle plate <NUM>, while ensuring good support of baffle plate bearing.

The first baffle plate <NUM> is provided with an exhaust port <NUM>, and the exhaust port <NUM> is arranged on a side of the first baffle plate <NUM> close to the second baffle plate <NUM>, which can reduce the exhaust resistance of a large-displacement compressor and improve the working performance of the compressor. An exhaust one-way stop valve is arranged at the lower end of the exhaust port <NUM>, which can reduce the gas flow resistance and improve the energy efficiency of the compressor.

In some embodiments, the support shaft <NUM> is provided with an oil guide hole 13a in the radial direction, and the crankshaft <NUM> is provided with a central oil hole <NUM> extending in the axial direction. The oil guide hole 13a communicates with the central oil hole <NUM> to ensure that during operation of the compressor, the lubricating oil flowing through the central oil hole <NUM> can flow to the gap between the support shaft <NUM> and the first baffle plate <NUM> through the oil guide hole 13a as a bypass, which plays a good role in lubricating and cooling the bearing friction.

In some embodiments, the stress relief structure includes a second flexible groove <NUM> arranged on a side of the first baffle plate <NUM> facing toward the second baffle plate <NUM>, and on the end face of the first baffle plate <NUM> facing toward the second baffle plate <NUM>, the second flexible groove <NUM> is arranged on a side of the first baffle plate <NUM> close to the inner edge of first round hole <NUM>.

In this embodiment, by arranging the second flexible groove <NUM>, an easily deformable structure can be formed on the first side of the first baffle plate <NUM> close to the second eccentric portion <NUM>, so that when the contact stress between the first side of the first baffle plate <NUM> and the support shaft <NUM> is too large, the second flexible groove <NUM> can be used to deform the first baffle plate <NUM> at the contact position, relatively reducing the contact stress here, reducing the wear of the baffle plate bearing, improving the reliability of the baffle plate bearing, and extending the service life of the baffle plate bearing.

When both the first flexible groove <NUM> and the second flexible groove <NUM> are arranged, both sides of the first baffle plate <NUM> may be provided with a stress relief structure, which can more comprehensively and effectively reduce the contact stress of the baffle plate bearing, reduce the wear of the baffle plate bearing, and improve the reliability of baffle plate bearings.

In some embodiments, the second flexible groove <NUM> is an annular groove, and the second flexible groove <NUM> is arranged coaxially with respect to the support shaft <NUM>. Since the second flexible groove <NUM> is arranged on a side of the first baffle plate <NUM> facing toward the second baffle plate <NUM>, and cooperates with the second baffle plate <NUM>, but not with the end face of the roller, there is no roller sealing problem, so that the second flexible groove <NUM> can be formed as an annular groove, which can reduce the stress along the entire circumferential direction on the side of the first baffle plate <NUM> close to the second baffle plate <NUM>, and improve the stress reduction effect of the first baffle plate <NUM>.

Referring to <FIG>, in some embodiments, the stress relief structure includes a bearing bush <NUM> arranged inside the first round hole <NUM>, and the bearing bush <NUM> is sleeved outside the support shaft <NUM>. The difference between this embodiment and the embodiment of <FIG> is that in this embodiment, there are not flexible grooves arranged on both ends of the first baffle plate <NUM>. And in order to improve the wear resistance of the baffle plate bearing, the bearing bush <NUM> made of wear-resistant materials is designed in the first round hole <NUM> to improve the reliability of baffle plate bearing.

The end of the first round hole <NUM> close to the first eccentric portion <NUM> is provided with an annular radial protrusion <NUM>, and the bearing bush <NUM> stops on the radial protrusion <NUM>. The inner diameter of the radial protrusion <NUM> is smaller than the inner diameter of the first round hole <NUM>, so that the radial protrusion <NUM> can form an anti-leakage structure, which can prevent the problem of leakage caused by the too small sealing distance between the first roller <NUM> in the first cylinder <NUM> and the first baffle plate <NUM>, and can also play a role in positioning the installation of the bearing bush <NUM>. In order to ensure the structural strength of the radial protrusion <NUM> used to limit and prevent leakage, the axial height of the radial protrusion is h, and h≥<NUM>.

In some embodiments, the height of the first round hole <NUM> is H, the installation height of the first round hole <NUM> matched with the bearing bush <NUM> is H1, and the height of the bearing bush <NUM> is H2, and H2≤H1≤H, which can ensure that the bearing bush <NUM> pressed into the first round hole <NUM> does not protrude to the outside of the first round hole <NUM>, avoiding interference between the second baffle plate <NUM> and the bearing bush <NUM> during assembly, and ensuring the reliability of the overall installation structure.

In some embodiments, a side of the bearing bush <NUM> is provided with a disconnection structure <NUM>, so that the bearing bush <NUM> on both sides of the disconnection structure <NUM> is completely disconnected, so that when the bearing bush <NUM> is pressed into the first round hole <NUM>, the bearing bush <NUM> can be contracted under the action of the disconnection structure <NUM>, and the bearing bush <NUM> can be easily pressed into the first round hole <NUM>, and then the bearing bush <NUM> can recover under the action of the elastic force, forming a surplus cooperation with the first round hole <NUM>.

In some embodiments, the disconnection structure <NUM> is a disconnection cut.

In some embodiments, the pump body assembly further includes a first muffler <NUM>, a first roller <NUM>, a second cylinder <NUM>, a second flange <NUM>, a second muffler <NUM> and a second roller <NUM>, the first roller <NUM> is sleeved outside the first eccentric portion <NUM>, is arranged inside the first cylinder <NUM>, and is driven to rotate by the first eccentric portion <NUM>, and the second roller <NUM> is sleeved outside the second eccentric portion <NUM>, is arranged inside the second cylinder <NUM>, and is driven by the second eccentric portion <NUM>. The first muffler <NUM> is arranged on a side of the first flange <NUM> away from the first eccentric portion <NUM>, and the second muffler <NUM> is arranged on a side of the second flange <NUM> away from the second eccentric portion <NUM>. The first muffler <NUM> can be used for noise reduction for the exhaust gas on the first flange <NUM>, and the second muffler <NUM> can be used for noise reduction for the exhaust gas on the second flange <NUM>, so as to reduce the noise during the operation of the pump body assembly.

The inner circle of the second baffle plate <NUM> is passed by the crankshaft <NUM>, and the second baffle plate <NUM> is arranged at the end of the first baffle plate <NUM> away from the first eccentric portion <NUM>, which can seal the second cylinder <NUM>. The second baffle plate <NUM> can adopt a conventional intermediate baffle structure.

The first cylinder <NUM> in the above embodiment is, for example, an upper cylinder, and the first flange <NUM> is, for example, an upper flange.

In other embodiments, the first cylinder <NUM> can also be a lower cylinder, and the second flange <NUM> is, for example, a lower flange.

In some embodiments, the crankshaft <NUM> is provided with a plurality of eccentric portions, and a support shaft <NUM> is arranged between two adjacent eccentric portions.

In some embodiments, the above-mentioned baffle support may also be replaced by a roller bearing support.

According to an embodiment of the present invention, the compressor includes a pump body assembly, and the pump body assembly is the above-mentioned pump body assembly.

Claim 1:
A pump body assembly, comprising:
a crankshaft (<NUM>) comprising a first eccentric portion (<NUM>), a support shaft (<NUM>) and a second eccentric portion (<NUM>) which are arranged at intervals in an axial direction;
a first baffle plate (<NUM>) and a second baffle plate (<NUM>) which are arranged in sequence between the first eccentric portion (<NUM>) and the second eccentric portion (<NUM>),
wherein a first round hole (<NUM>) is arranged on the first baffle plate (<NUM>), and the support shaft (<NUM>) is arranged in the first round hole (<NUM>), so that the first baffle plate (<NUM>) and the support shaft (<NUM>) form a baffle plate bearing, characterised in that
the baffle plate bearing has a stress relief structure for reducing a contact stress between the support shaft (<NUM>) and the first baffle plate (<NUM>), and
the stress relief structure comprises a second flexible groove (<NUM>) arranged on an end face of the first baffle plate (<NUM>) facing toward the second baffle plate (<NUM>), the second flexible groove (<NUM>) is arranged on a side of the first baffle plate (<NUM>) close to an inner edge of the first round hole (<NUM>).