CN216950859U

CN216950859U - Pump body subassembly and rotary compressor

Info

Publication number: CN216950859U
Application number: CN202220028006.XU
Authority: CN
Inventors: 雒应学
Original assignee: Guangzhou Deshan Cnc Technology Co ltd
Current assignee: Guangzhou Deshan Cnc Technology Co ltd
Priority date: 2022-01-04
Filing date: 2022-01-04
Publication date: 2022-07-12
Anticipated expiration: 2032-01-04

Abstract

The utility model discloses a pump body assembly and a rotary compressor, wherein the pump body assembly comprises an air cylinder, a crankshaft, a rotor, a sliding sheet and a sealing cover, one end of the sliding sheet is positioned in a sliding sheet groove which is formed along the radial direction of the air cylinder, and the other end of the sliding sheet is stopped to abut against the outer cylindrical surface of the rotor. The axial one end of cylinder is connected with first bearing, and first bearing is equipped with discharge valve. High-pressure refrigerants generated by compression in the cylinder are discharged through the exhaust valve, and are discharged out of the pump body assembly through a silencing cavity defined by the first bearing and the silencing end cover. The first bearing is provided with an air guide channel which is communicated with the silencing cavity and the slide sheet groove and guides a high-pressure refrigerant in the silencing cavity into the tail end of the slide sheet groove. The sealing of the sliding sheet groove is realized through the sealing cover assembled on the outer surface of the air cylinder, a sealed high-pressure environment is formed at the tail end of the sliding sheet groove, and pressure tending to the center of the air cylinder is provided for the sliding sheet, so that one end of the sliding sheet is sealed and stopped against the outer cylindrical surface of the rotor, the air suction cavity and the compression strength in the air cylinder are effectively separated, and the leakage of compressed high-pressure gas is reduced.

Description

Pump body subassembly and rotary compressor

Technical Field

The utility model relates to the technical field of compressors, in particular to a pump body assembly and a rotary compressor.

Background

In a conventional rotary compressor, a pump body is enclosed in a compressor housing of a high pressure chamber. The pump body is internally provided with a cylinder, a crankshaft, a main bearing, an auxiliary bearing and a rotor, a sealed cavity is formed between the cylinder and the main bearing and between the cylinder and the auxiliary bearing, and the rotor is driven by the crankshaft to rotate eccentrically in the sealed cavity. The cylinder is provided with a sliding sheet groove on the circumferential wall, and a spring and a sliding sheet are assembled in the sliding sheet groove. The tail end of the sliding sheet stops abutting against the cylindrical surface of the rotor, and reciprocates in the sliding sheet groove along with the eccentric rotation of the rotor, so that the sealing cavity is divided into an air suction cavity and a compression cavity. The sliding vane is under the action of high-pressure environment in the compressor shell and the pressure of a spring at the tail part of the sliding vane groove in the reciprocating motion process, and always bears the thrust towards the center direction of the cylinder, so that the tail end of the sliding vane is in sealing contact with the cylindrical surface of the rotor.

For a low-pressure cavity compressor, the reciprocating motion of the sliding vane in the sliding vane groove is only pushed by a spring at the tail part of the sliding vane groove, so that the running state of the sliding vane in the sliding vane groove and the sealing effect of the contact between the sliding vane and a rotor cylindrical surface are difficult to ensure, and the overall working efficiency of the compressor is influenced.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides a pump body assembly and a rotary compressor, which can enable one end of a sliding sheet to be sealed and abutted against the outer cylindrical surface of a rotor, and effectively separate a suction cavity and a compression cavity in a cylinder.

In a first aspect, embodiments of the present invention provide a pump body assembly, including a cylinder, a crankshaft, a rotor, a sliding vane, and a sealing cover, wherein,

one axial end of the cylinder is connected with a first bearing, the first bearing is provided with an exhaust valve, the first bearing is used for connecting a silencing end cover at one side far away from the cylinder, and a silencing cavity can be defined by the first bearing and the silencing end cover;

the rotor is sleeved outside the eccentric part of the crankshaft and eccentrically rotates in the inner cavity of the cylinder, the cylinder is provided with a slide sheet groove along the radial direction, the slide sheet reciprocates in the slide sheet groove, and one end of the slide sheet is contacted with the outer cylindrical surface of the rotor;

the sealing cover is assembled on the outer surface of the cylinder and used for sealing the sliding sheet groove;

an air guide channel is arranged on the first bearing and is communicated with the silencing cavity and the sliding sheet groove.

According to the pump body assembly provided by the embodiment of the utility model, at least the following effects are achieved: when the pump body assembly works, the rotor is driven by the crankshaft to eccentrically rotate in the inner cavity of the cylinder; one end of the sliding sheet is positioned in a sliding sheet groove which is arranged along the radial direction of the cylinder, and the other end of the sliding sheet is stopped to abut against the outer cylindrical surface of the rotor and reciprocates in the sliding sheet groove along with the eccentric rotation of the rotor in the inner cavity of the cylinder. The pump body assembly completes the compression process of gas through the eccentric rotation of the rotor in the cylinder, compressed high-pressure refrigerant gas is discharged through the exhaust valve on the first bearing, and is discharged out of the pump body assembly through the silencing cavity defined by the first bearing and the silencing end cover. An air guide channel is arranged on the first bearing, the air guide channel is communicated with the silencing cavity and the slide sheet groove, and high-pressure refrigerant in the silencing cavity is guided into the tail end of the slide sheet groove. The sealing of the sliding sheet groove is realized through the sealing cover assembled on the outer surface of the air cylinder, a sealed high-pressure environment is formed at the tail end of the sliding sheet groove, and pressure tending to the center of the air cylinder is provided for the sliding sheet, so that one end of the sliding sheet is sealed and stopped against the outer cylindrical surface of the rotor, the air suction cavity and the compression strength in the air cylinder are effectively separated, and the leakage of compressed high-pressure gas is reduced.

According to some embodiments of the utility model, the slide slot comprises a slide channel and a resilient element receiving aperture;

the slide sheet channel is close to the center of the cylinder and extends along the radial direction of the cylinder, and the elastic element is positioned on one side far away from the center of the cylinder;

the elastic element accommodating hole is internally provided with an elastic element, and the sealing cover is provided with a sealing plug extending into the elastic element accommodating hole.

According to some embodiments of the utility model, the sealing plug is circumferentially provided with an annular groove fitted with a sealing ring cooperating with the resilient element receiving bore.

According to some embodiments of the utility model, the elastic element is a spring, the end of the slide sheet contacting the spring is provided with a spring positioning structure, and the diameter of the sealing plug is larger than that of the spring.

According to some embodiments of the utility model, the air guide channel comprises an air guide through hole and an air guide groove;

the air guide through hole is formed in the first bearing, and the air guide groove is formed in the first bearing and is positioned on the end face, matched with the air cylinder, of the first bearing;

the air guide groove is communicated with the elastic element accommodating hole and the air guide through hole, and the air guide through hole is communicated with the silencing cavity.

According to some embodiments of the utility model, an end of the air guide groove communicating with the air guide through hole is semicircular, and a diameter of the semicircular portion is the same as a diameter of the air guide through hole.

According to some embodiments of the utility model, the pump body assembly further comprises a second bearing, the first bearing and the second bearing being located at two axial ends of the cylinder respectively;

the first bearing and the second bearing are provided with bulges matched with the sliding sheet groove on the end surface contacted with the cylinder, and the bulges are used for sealing the sliding sheet groove.

According to some embodiments of the utility model, the number of the cylinders is at least two, a partition plate is arranged between every two adjacent cylinders, and the partition plate is provided with a protrusion matched with the sliding vane groove on the end surface in contact with the cylinders, and used for sealing the sliding vane groove.

According to some embodiments of the utility model, the sealing cover is bolted to the cylinder.

In a second aspect, an embodiment of the present invention further provides a rotary compressor, including the pump body assembly as described in the first aspect, and the noise reduction end cover, where the noise reduction end cover is connected to the first bearing of the pump body assembly.

The rotary compressor provided by the embodiment of the utility model has at least the following beneficial effects: the rotary compressor can be designed as a low-pressure cavity compressor, and when the whole compressor shell is in a low-pressure environment, a sealing space is formed at the tail end of a sliding sheet groove through a sealing cover assembled at the sliding sheet groove on the outer surface of the air cylinder. A gas guide channel is formed in a bearing between the cylinder and the silencing end cover, and high-pressure refrigerant gas in the silencing cavity is introduced into the tail end of the slide sheet groove to form a stable high-pressure space. The pressure towards the circle center of the cylinder is provided for the sliding sheet, the running state of the sliding sheet in the sliding sheet groove is guaranteed, and the contact tightness between the sliding sheet and the outer cylindrical surface of the rotor is further improved.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic diagram of a pump body assembly according to an embodiment of the present invention;

fig. 2 is another angle schematic diagram of the pump body assembly structure according to the embodiment of the present invention.

Reference numerals: cylinder 100, spring 110, crankshaft 200, rotor 300, slide 400, sealing cover 500, sealing plug 510, sealing ring 520, first bearing 600, air guide through hole 610, air guide groove 620, noise reduction end cover 700, second bearing 800.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. The terms first, second and the like in the description and in the claims, and the drawings described above, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, unless explicitly defined otherwise, terms such as set, mounted, connected, etc., should be interpreted broadly, such as a fixed connection or a movable connection, and may be a detachable connection or a non-detachable connection, or an integral connection; either directly or indirectly through intervening media, or through both elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Traditional roll formula rotor compressor is mostly high-pressure chamber compressor, and the high-pressure refrigerant gas that produces after the compression of pump body subassembly is direct earlier inside the compressor housing, behind the cooling motor, discharges into the condenser from the blast pipe of compressor upper cover again. In this type of compressor, the trailing end of the vane slot communicates with the high pressure environment inside the housing, and the vane is subjected to thrust applied by the high pressure environment in the direction of the cylinder center. This thrust and the elasticity stack that the gleitbretter spring applyed to the gleitbretter can make the gleitbretter tail end at rotor eccentric pivoted in-process and its outer cylinder face sealing contact, prevent that the compressed gas in the high pressure chamber in the cylinder from passing through the gleitbretter to low pressure chamber leakage.

The high-pressure cavity compressor has high integral temperature and low motor efficiency, and the low-pressure cavity compressor is proposed to be improved in the related technology. The low-pressure cavity compressor firstly introduces low-temperature low-pressure refrigerant gas into a compressor shell to cool the motor, then the refrigerant gas is sucked into the pump body assembly to be compressed, and the compressed high-pressure gas is discharged into the condenser through the exhaust pipe. The low-pressure cavity compressor reduces the temperature of a motor and reduces the power consumption of the compressor, has obvious advantages compared with other compressors, and also provides a new problem. In a low-pressure environment, the reciprocating motion of the sliding sheet in the sliding sheet groove is only driven by an elastic element at the tail end of the sliding sheet groove, and the hidden danger that the elastic element is fatigued and is difficult to drive the sliding sheet to reset exists.

Based on this, the present invention proposes a pump body assembly, with reference to fig. 1 and 2, comprising a cylinder 100, a crankshaft 200, a rotor 300, a sliding vane 400 and a sealing cover 500. Wherein, cylinder 100 axial one end is connected with first bearing 600, is connected with amortization end cover 700 at the opposite side that first bearing 600 kept away from cylinder 100, and amortization chamber is injectd between amortization end cover 700 and the first bearing 600. The first bearing 600 is provided with an exhaust valve, and high-pressure refrigerant gas generated by compression in the cylinder 100 reaches the silencing cavity through the exhaust valve and is finally exhausted through an exhaust pipeline.

The crankshaft 200 penetrates the cylinder 100, the first bearing 600 and the silencing end cap 700, and the rotor 300 is sleeved outside the eccentric part of the crankshaft 200 and driven by the crankshaft 200 to rotate eccentrically in the cylinder cavity. The cylinder 100 has radially seted up the sliding vane groove, and elastic element is installed to sliding vane groove tail end, and the tail end refers to the sliding vane groove and keeps away from the one end at cylinder 100 center. One end of the sliding piece 400 is in contact with the elastic member, and the other end thereof extends into the cylinder 100 to stop against the outer cylindrical surface of the rotor 300. The vane 400 reciprocates in the vane groove as the rotor 300 eccentrically rotates.

Referring to fig. 1, a sealing cover 500 is assembled on the outer surface of the cylinder 100 where the vane slot is opened, and the sealing cover 500 seals the vane slot opened in the cylinder 100 to isolate the vane slot from gas exchange with the low-pressure environment in the compressor housing. The seal cover 500 and the cylinder 100 may be connected by bolts. An air guide channel is arranged on the first bearing 600, one end of the air guide channel is communicated with the silencing cavity, the other end of the air guide channel is communicated with the slide sheet groove, and high-pressure refrigerant gas in the silencing cavity is guided into the sealed slide sheet groove, so that a relatively stable high-pressure space is formed at the tail end of the slide sheet groove. Under the effect of the high-pressure environment at the tail end of the sliding sheet groove, pressure tending to the center of the cylinder 100 is provided for the sliding sheet 400, meanwhile, the elastic force generated by the elastic element is superposed, the reciprocating motion stability of the sliding sheet 400 in the sliding sheet groove is further improved, and the sealing effect between the sliding sheet 400 and the outer cylindrical surface of the rotor 300 is improved.

It should be noted that the pump body assembly can be applied to a low-pressure chamber rotary compressor. Install in the sealed lid 500 of casing surface and prevent to introduce the high-pressure gas of slide groove tail end and leak the low pressure environment in the casing, maintain comparatively stable high-pressure environment at slide groove tail portion, reduce the loss that the unable reset of gleitbretter 400 leads to high-pressure gas to leak and bring in the slide groove.

The vane slot formed in the cylinder 100 includes a vane passage portion extending in a radial direction of the cylinder 100 and an elastic member receiving hole portion located away from the center of the cylinder 100. In order to improve the sealing effect of the sealing cover 500 against the slide groove, the sealing cover 500 is provided with a sealing plug 510 penetrating into the elastic member receiving hole. After the sealing cap 500 is assembled with the cylinder 100, the sealing plug 510 just plugs the elastic element receiving hole, and at this time, one end of the elastic element abuts against the sealing plug 510, and the other end abuts against one end of the sliding piece 400. The sealing cap 500 serves to prevent the elastic member from being ejected out of the cylinder 100 and the sealing plug 510 from being ejected out of the elastic member receiving hole after the high pressure gas is introduced into the slider groove.

It should be noted that the sealing plug 510 and the sealing cover 500 may be connected in a split manner, such as by adhesion, or may be designed to be in an integral structure.

To further enhance the sealing effect of the sealing cap 500, in some embodiments, an annular groove is formed circumferentially around the sealing plug 510, and a sealing ring 520 is fittingly mounted in the groove. After the sealing plug 510 and the sealing ring 520 are mounted, the sealing ring 520 is pressed against the inner wall of the elastic member receiving hole by the elasticity of the sealing ring 520. The sealing ring 520 may be a one-piece sealing ring 520 made of the same material, or a combined sealing ring 520, such as a sealing ring 520 with an O-ring, which is not further limited in this application.

In some embodiments, the elastic element is a spring 110, and one end of the sliding piece 400 contacting the spring 110 is provided with a spring positioning structure for clamping the spring 110 to perform positioning and fixing functions. The spring positioning structure may be that one end of the sliding piece contacting the spring is set to be a saw-tooth shape, one end of the spring 110 is clamped between the saw teeth of the sliding piece 400, and the other end of the spring abuts against the sealing plug 510. The spring positioning structure can also be provided with a bulge only at the position of the slide sheet contacting with the spring for clamping the spring. The diameter of the sealing plug 510 should be larger than the diameter of the spring 110 for better sealing.

The application provides a pump body structure leads into sealed slide groove with the high-pressure refrigerant gas in the amortization intracavity through the air guide channel who sets up on first bearing 600 in order to form stable high-pressure environment at slide groove tail end. During the operation of the pump assembly, the sliding vane 400 reciprocates in the sliding vane slot, so that the volume of the tail end of the sliding vane slot changes with the reciprocation of the sliding vane 400. In order to enable the high-pressure gas to reach the tail end of the slide sheet groove all the time, one end of the gas guide channel is communicated with the silencing cavity, and the other end of the gas guide channel is communicated with the elastic element accommodating hole part of the slide sheet groove.

Specifically, if the cross-sectional areas of the first bearing 600 and the sound-deadening chamber are sufficiently large and both cover the elastic-element-receiving hole of the vane groove, the air guide passage may be a through-hole provided in the first bearing 600, one end of which leads to the sound-deadening chamber and the other end of which leads to the elastic-element-receiving hole portion of the vane groove. However, in order to reduce production costs and reduce compressor clearance, the cross-section of the muffling chamber does not generally cover the resilient member receiving aperture of the cylinder vane slot. In this case, the air guide passage is a combination of an air guide through hole 610 formed in the first bearing 600 and an air guide groove 620 formed in the contact end surface of the first bearing 600 and the cylinder 100. One end of the air guide through hole 610 is communicated with the silencing cavity, and the other end is communicated with the air guide groove 620; one end of the air guide groove 620 is communicated with the air guide through hole 610, and the other end is communicated with the elastic element accommodating hole of the slide sheet groove; the high-pressure gas in the silencing cavity is introduced into the tail end of the slide plate groove through the combination of the gas guide through hole 610 and the gas guide groove 620.

It should be noted that the cross section of the air guide groove is semicircular at the end communicating with the air guide through hole 610, the diameter of the semicircular part is the same as that of the air guide through hole 610, the middle section of the cross section is rectangular, and the width of the middle section rectangle is the same as that of the air guide through hole 610. Therefore, the high-pressure gas amount filled in the gas guide channel can be reduced as much as possible, the clearance of the pump body assembly is integrally reduced, and the working efficiency of the compressor is improved.

In some embodiments, the rotary compressor further includes a second bearing 800 for supporting the crankshaft 200, the cylinder 100 is located between the first bearing 600 and the second bearing 800, and the rotor 300 is fitted over an eccentric portion of the crankshaft 200. Compression chambers are defined between the inner peripheral wall of the cylinder 100, the outer peripheral wall of the rotor, the first bearing end surface and the second bearing 800 end surface. The sliding vane 400 reciprocating in the cylinder sliding vane groove divides the compression chamber into a suction chamber and a compression chamber. As the rotor 300 eccentrically rotates in the cylinder 100, the suction chamber and the compression chamber periodically change, completing the suction and compression processes. In order to further improve the sealing performance of the vane slot and prevent the high-pressure gas introduced into the vane slot through the gas guide channel from escaping through the end surface of the bearing, the end surfaces of the first bearing 600 and the second bearing 800 contacting the cylinder 100 are provided with protrusions matched with the vane slot. When the first bearing 600 and the second bearing 800 are matched with the upper end surface and the lower end surface of the cylinder 100, the protrusions are just clamped into the upper end surface and the lower end surface of the sliding sheet groove to form matching, so that the sealing degree is further improved, and the overall efficiency of the compressor is improved.

The application provides a pump body subassembly can be applicable to the rotary compressor of single cylinder 100, also can be applicable to the rotary compressor of a plurality of cylinders 100 simultaneously. For example, when there are two cylinders 100, it is necessary to assemble the sealing cover 500, the sealing plug 510, and the sealing ring 520 on each cylinder 100; an air guide passage needs to be provided for the vane groove of each cylinder 100. Meanwhile, in order to further improve the sealing performance of the sliding vane groove, besides the end surfaces of the first bearing 600 and the second bearing 800, which are in contact with the cylinder 100, are provided with protrusions matched with the sliding vane groove, the upper end surface and the lower end surface of the partition board connecting the two cylinders are also provided with protrusions matched with the sliding vane groove.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims

1. A pump body component is characterized by comprising a cylinder, a crankshaft, a rotor, a slip sheet and a sealing cover, wherein,

2. The pump body assembly of claim 1, wherein the vane slot includes a vane channel and a resilient element receiving aperture;

3. The pump body assembly according to claim 2, characterized in that the sealing plug is circumferentially provided with an annular groove fitted with a sealing ring cooperating with the elastic element receiving hole.

4. The pump body assembly of claim 2, wherein the resilient member is a spring, and a spring retaining structure is provided at an end of the slide contacting the spring, and the sealing plug has a diameter greater than that of the spring.

5. The pump body assembly of claim 2, wherein the air guide channel includes an air guide through hole and an air guide groove;

6. The pump block assembly according to claim 5, wherein an end of the air guide groove communicating with the air guide through hole is semicircular, and a diameter of the semicircular portion is the same as a diameter of the air guide through hole.

7. The pump body assembly according to claim 1, further comprising a second bearing, wherein the first bearing and the second bearing are respectively located at both ends in an axial direction of the cylinder;

8. The pump body assembly according to claim 7, wherein the number of the cylinders is at least two, a partition plate is arranged between every two adjacent cylinders, and the partition plate is provided with a protrusion matched with the sliding vane groove on the end face, in contact with the cylinders, of each partition plate, so as to seal the sliding vane groove.

9. The pump body assembly of claim 1, wherein the seal cap is bolted to the cylinder.

10. A rotary compressor comprising the pump body assembly according to any one of claims 1 to 9 and the noise-reduction end cap, the noise-reduction end cap being connected to the first bearing of the pump body assembly.