Pump body assembly, compressor and refrigeration equipment

Abstract

The present invention discloses a pump body assembly, a compressor and a refrigeration device. The pump body assembly includes a cylinder, a lower bearing, a crankshaft and a piston. The lower bearing is provided with at least one oil injection hole, the outlet of the oil injection hole penetrates through to the upper end face of the lower bearing, and the inlet penetrates through to the outer peripheral face or the lower end face of the lower bearing. The crankshaft includes an eccentric portion, and the eccentric portion is provided with a thrust surface. The piston is sleeved on the eccentric portion, and the piston and the eccentric portion are rotatably arranged in the cylinder. The distance between the center of the outlet of the oil injection hole and the center of the lower bearing is greater than or equal to the radius of the thrust surface of the eccentric portion of the crankshaft and less than or equal to the sum of the eccentricity of the crankshaft and the inner circle radius of the piston. During the operation of the pump body assembly of the present invention, the refrigeration oil enters the gap between the outer edge of the thrust surface and the inner edge of the piston through the oil injection hole from the oil sump, and can supply oil to the lower end face of the piston, strengthening the seal between the lower end face of the piston and the lower bearing, reducing the leakage loss of the refrigerant, and improving the energy efficiency level of the compressor.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and particularly relates to a pump body assembly, a compressor, and a refrigeration device. Background Art

[0002] In the related art, in the loss distribution of the compression capacity of a rotary compressor, the leakage loss accounts for 40% - 50%. During the operation of the compressor, due to different operating states of the piston, there is varying degrees of leakage between the lower end surface of the piston and the lower bearing, reducing the energy efficiency level of the rotary compressor. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a pump body assembly that can effectively reduce the leakage loss of refrigerant and improve the compression efficiency.

[0004] The present invention also provides a compressor having the above-mentioned pump body assembly.

[0005] The present invention also provides a refrigeration device having the above-mentioned compressor.

[0006] The pump body assembly according to the first aspect embodiment of the present invention includes: a cylinder; a lower bearing connected to the cylinder, the lower bearing being provided with at least one oil injection hole, an outlet of the oil injection hole penetrating through to the upper end surface of the lower bearing, and an inlet of the oil injection hole penetrating through to the outer peripheral surface or the lower end surface of the lower bearing; a crankshaft including an eccentric portion, the eccentric portion being provided with a thrust surface that cooperates with the upper end surface of the lower bearing; a piston sleeved on the eccentric portion, the piston and the eccentric portion being rotatably disposed within the cylinder; wherein, the distance between the center of the outlet of the oil injection hole and the center of the lower bearing is L, the radius of the thrust surface is r, the eccentricity of the crankshaft is e, and the inner diameter of the piston is D1, satisfying: r ≤ L ≤ e + D1 / 2.

[0007] The pump body assembly according to the embodiment of the present invention has at least the following beneficial effects:

[0008] By providing at least one oil injection hole in the lower bearing, the inlet of the oil injection hole penetrates through to the outer peripheral surface or the lower end surface of the lower bearing so as to communicate with the oil sump of the compressor, and the outlet of the oil injection hole penetrates through to the upper end surface of the lower bearing; and the distance between the center of the outlet of the oil injection hole and the center of the lower bearing is greater than or equal to the radius of the thrust surface of the eccentric portion of the crankshaft and less than or equal to the sum of the eccentricity of the crankshaft and the inner radius of the piston. During the operation of the pump body assembly, the refrigeration oil enters from the oil sump through the oil injection hole into the gap between the outer edge of the thrust surface and the inner edge of the piston, and can supply oil to the lower end surface of the piston, strengthening the seal between the lower end surface of the piston and the lower bearing, reducing the leakage loss of refrigerant, and improving the compression efficiency of the pump body assembly.

[0009] According to some embodiments of the present invention, the diameter of the outlet of the fuel injection hole is d, and the outer diameter of the piston is D2, satisfying: L + d / 2 < D2 / 2 - e.

[0010] According to some embodiments of the present invention, a groove is provided at one end of the eccentric portion facing the lower bearing, and an oil storage cavity is formed between the side wall of the groove, the piston and the lower bearing. During the rotation of the crankshaft relative to the lower bearing, the oil storage cavity has a state of being communicated with the fuel injection hole.

[0011] According to some embodiments of the present invention, a groove is provided at one end of the eccentric portion facing the lower bearing, and an oil storage cavity is formed between the side wall of the groove, the piston and the lower bearing. During the rotation of the crankshaft relative to the lower bearing, the oil storage cavity and the outlet of the fuel injection hole are completely coincident in the projection plane perpendicular to the axis of the lower bearing.

[0012] According to some embodiments of the present invention, the pump body assembly further includes a sliding vane, and the sliding vane is installed in the cylinder; a two-dimensional coordinate system is defined on the upper end surface of the lower bearing, the origin of the coordinate system is the center of the lower bearing, the x-axis is the straight line where the center line of the sliding vane is located, the y-axis is the straight line perpendicular to the x-axis, the angle where the center line of the sliding vane is located is 0°, and the clockwise direction is the direction of increasing the angle. The outlet of the fuel injection hole is located in the area of 60° to 120° or 240° to 300°.

[0013] According to some embodiments of the present invention, the diameter of the fuel injection hole is 0.5 mm to 1.5 mm.

[0014] According to some embodiments of the present invention, a plurality of fuel injection holes are provided, and the outlets of the plurality of fuel injection holes are arranged at intervals on the upper end surface of the lower bearing.

[0015] According to some embodiments of the present invention, the lower bearing includes a shaft neck portion and a flange portion, and one end of the fuel injection hole far from the upper end surface of the lower bearing penetrates to the lower end surface or the outer peripheral surface of the shaft neck portion.

[0016] According to some embodiments of the present invention, the lower bearing includes a shaft neck portion and a flange portion, and one end of the fuel injection hole far from the upper end surface of the lower bearing penetrates to the lower end surface or the outer peripheral surface of the flange portion.

[0017] The compressor according to the second aspect embodiment of the present invention includes the pump body assembly described in the above embodiments.

[0018] The compressor according to the embodiment of the present invention has at least the following beneficial effects:

[0019] Adopting the pump body assembly of the first aspect embodiment, the pump body assembly is provided with at least one oil injection hole in the lower bearing. The inlet of the oil injection hole penetrates to the outer peripheral surface or the lower end surface of the lower bearing so as to be able to communicate with the oil sump of the compressor, and the outlet of the oil injection hole penetrates to the upper end surface of the lower bearing; and the distance between the center of the outlet of the oil injection hole and the center of the lower bearing is greater than or equal to the thrust surface radius of the eccentric part of the crankshaft and less than or equal to the sum of the eccentricity of the crankshaft and the inner circle radius of the piston. During the operation of the compressor, the refrigerating oil enters the gap between the outer edge of the thrust surface and the inner edge of the piston through the oil injection hole from the oil sump, and can supply oil to the lower end surface of the piston, strengthening the seal between the lower end surface of the piston and the lower bearing, reducing the leakage loss of the refrigerant, improving the volumetric efficiency of the compressor, and thus improving the energy efficiency level of the compressor.

[0020] The refrigeration device according to the third aspect embodiment of the present invention includes the compressor described in the above embodiments.

[0021] The refrigeration device according to the embodiment of the present invention has at least the following beneficial effects:

[0022] Adopting the compressor of the second aspect embodiment, the compressor includes a pump body assembly. The pump body assembly is provided with at least one oil injection hole in the lower bearing. The inlet of the oil injection hole penetrates to the outer peripheral surface or the lower end surface of the lower bearing so as to be able to communicate with the oil sump of the compressor, and the outlet of the oil injection hole penetrates to the upper end surface of the lower bearing; and the distance between the center of the outlet of the oil injection hole and the center of the lower bearing is greater than or equal to the thrust surface radius of the eccentric part of the crankshaft and less than or equal to the sum of the eccentricity of the crankshaft and the inner circle radius of the piston. During the operation of the compressor, the refrigerating oil enters the gap between the outer edge of the thrust surface and the inner edge of the piston through the oil injection hole from the oil sump, strengthening the seal between the lower end surface of the piston and the lower bearing, and can supply oil to the lower end surface of the piston, reducing the leakage loss of the refrigerant, improving the volumetric efficiency of the compressor, and thus improving the energy efficiency level of the compressor.

[0023] The additional aspects and advantages of the present invention will be partly given in the following description, partly become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0024] The following further describes the present invention with reference to the drawings and embodiments, where:

[0025] Figure 1 is a cross-sectional view schematic diagram of a pump body assembly according to an embodiment of the present invention;

[0026] Figure 2 is Figure 1 a structural schematic diagram of the lower bearing in

[0027] Figure 3 is Figure 2 a cross-sectional view schematic diagram of the lower bearing shown in

[0028] Figure 4 is Figure 1 a bottom view schematic diagram of the cylinder, crankshaft and piston in

[0029] Figure 5 is Figure 1 an enlarged view of part A in

[0030] Figure 6 a cross-sectional schematic diagram of the pump body assembly according to another embodiment of the present invention;

[0031] Figure 7 is Figure 6 a cross-sectional schematic diagram of the lower bearing in

[0032] Reference numerals in the drawings:

[0033] pump body assembly 1000;

[0034] cylinder 100; inner round hole 110; sliding vane groove 120; sliding vane 130; spring 140;

[0035] upper bearing 200;

[0036] lower bearing 300; fuel injection hole 310; first hole section 311; second hole section 312; third hole section 313; shaft neck portion 320; bearing hole 321; flange portion 330;

[0037] crankshaft 400; main shaft 410; eccentric portion 420; thrust surface 421; groove 422;

[0038] piston 500;

[0039] oil storage cavity 600. Detailed implementation manners

[0040] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention, and should not be construed as a limitation of the present invention.

[0041] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as up and down, etc., is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0042] In the description of the present invention, "a plurality of" refers to more than two. If the first and the second are described, it is only for the purpose of distinguishing technical features, and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0043] In the description of the present invention, unless otherwise clearly defined, terms such as "arrangement", "installation", and "connection" should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0044] Refer to Figure 1 As shown, a pump body assembly 1000 according to an embodiment of the present invention is used for a compressor, such as a rotary compressor. The pump body assembly 1000 according to the embodiment of the present invention includes a cylinder 100, an upper bearing 200, a lower bearing 300, a crankshaft 400, and a piston 500. The upper bearing 200 is fixedly connected to the upper end of the cylinder 100, and the lower bearing 300 is fixedly connected to the lower end of the cylinder 100. The crankshaft 400 includes a main shaft 410 and an eccentric portion 420. A piston 500 is sleeved outside the eccentric portion 420, and the eccentric portion 420 and the piston 500 are arranged inside the cylinder 100. An inner circular hole 110 and a sliding vane groove 120 are arranged inside the cylinder 100. A sliding vane 130 and a spring 140 are installed in the sliding vane groove 120. The sliding vane 130 is installed on the cylinder 100, and under the action of the spring 140, the sliding vane 130 remains in contact with the piston 500, and the cylinder 100 is isolated into a compression chamber and a suction chamber. Driven by the crankshaft 400, the eccentric portion 420 and the piston 500 perform eccentric rotation in the inner circular hole 110 of the cylinder 100, thereby realizing the intake, compression, and exhaust of the pump body assembly 1000.

[0045] Refer to Figure 1 and Figure 4 As shown, a thrust surface 421 is provided at the lower end of the eccentric portion 420. The thrust surface 421 and the lower end surface of the piston 500 respectively cooperate with the upper end surface of the lower bearing 300. During the operation of the pump body assembly 1000, since the pressure inside the inner edge of the piston 500 is greater than the pressure in the compression chamber, the refrigerant dissolved in the refrigerating oil will leak into the compression chamber through the above-mentioned contact gap. Therefore, strengthening the seal between the lower end surface of the piston 500 and the upper end surface of the lower bearing 300 and reducing the leakage of the lower end surface of the piston 500 are one of the important ways to improve the energy efficiency of the rotary compressor.

[0046] To solve the above problems, refer to Figure 2 and Figure 3As shown, the pump body assembly 1000 of the embodiment of the present invention is provided with one or more oil injection holes 310 in the lower bearing 300. One end of the oil injection hole 310 penetrates through to the upper end face of the lower bearing 300, and the other end of the oil injection hole 310 penetrates through to the outer peripheral face of the lower bearing 300, or penetrates through to the lower end face of the lower bearing 300, so as to be able to communicate with the oil sump of the compressor and enable the oil sump to supply oil into the oil injection hole 310. The inlet of the oil injection hole 310 is immersed in the oil sump, and the position where the outlet of the oil injection hole 310 is arranged satisfies that the distance between the center of the outlet of the oil injection hole 310 and the center of the lower bearing 300 is greater than or equal to the radius of the thrust surface 421 of the eccentric part 420 of the crankshaft 400, and less than or equal to the sum of the eccentricity of the crankshaft 400 and the inner circle radius of the piston 500 (half of the inner diameter of the piston 500). For the convenience of display and description, the outlet of the oil injection hole 310 is projected onto the corresponding position of the lower end face of the cylinder 100, referring to Figure 4 As shown, it is set that the distance L between the center of the outlet of the oil injection hole 310 and the center of the lower bearing 300 satisfies: r ≤ L ≤ e + D1 / 2. Wherein, r is the radius of the thrust surface 421, and the radius of the thrust surface 421 is the radius of the circle where the arc of the outer edge of the thrust surface 421 is located; e is the eccentricity of the crankshaft 400, and D1 is the inner diameter of the piston 500.

[0047] Therefore, referring to Figure 5 As shown, when the oil injection hole 310 of the embodiment of the present invention satisfies the above parameter range, the refrigeration oil in the oil sump, also known as lubricating oil, can enter the gap between the outer edge of the thrust surface 421 and the inner edge of the piston 500 through the oil injection hole 310; and during the working process of the pump body assembly 1000, the oil injection hole 310 can supply oil to the lower end face of the piston 500, strengthening the seal between the lower end face of the piston 500 and the lower bearing 300, so as to ensure that the seal distance is greater than or equal to 0.5 mm, reducing the leakage loss of the refrigerant in the refrigeration oil on the inner edge of the piston 500 to the compression chamber, reducing the repeated compression of the refrigerant, improving the compression efficiency of the pump body assembly 1000, thereby improving the volumetric efficiency of the compressor, reducing the power consumption of the compressor, and improving the energy efficiency level of the compressor.

[0048] Moreover, the arrangement of the oil injection hole 310 can also strengthen the lubrication between the lower bearing 300 and the thrust surface 421 and the lower end face of the piston 500, reduce the friction loss, improve the mechanical efficiency of the compressor, and thereby reduce the power consumption of the compressor.

[0049] Referring to Figure 4As shown, it can be understood that the diameter of the outlet of the fuel injection hole 310 is d, and the outer diameter of the piston 500 is D2, satisfying: L + d / 2 < D2 / 2 - e. Meeting the above parameters can further ensure that when the crankshaft 400 rotates to any angle, the piston 500 can seal the outlet of the fuel injection hole 310; reduce the leakage loss of the refrigerant in the refrigerant oil along the inner edge of the piston 500 to the compression chamber, reduce the repeated compression of the refrigerant, improve the compression efficiency of the pump body assembly 1000, thereby improving the volumetric efficiency of the compressor, reducing the power consumption of the compressor, and improving the energy efficiency level of the compressor.

[0050] Referring to Figure 1 , Figure 4 and Figure 5 As shown, it can be understood that a groove 422 is provided at one end of the eccentric portion 420 facing the lower bearing 300. An oil storage cavity 600 is formed between the side wall of the groove 422, the piston 500 and the lower bearing 300. During the operation of the pump body assembly 1000, the crankshaft 400 rotates relative to the lower bearing 300, and the oil storage cavity 600 has a state of being communicated with the fuel injection hole 310. During the process of the fuel injection hole 310 communicating with the oil storage cavity 600, the fuel injection hole 310 injects refrigerant oil into the oil storage cavity 600, so that there is sufficient refrigerant oil supply in the oil storage cavity 600, and under the eccentric rotation of the crankshaft 400, the refrigerant oil can continuously seal the gap between the lower end surface of the piston 500 and the lower bearing 300, reducing the leakage loss of the refrigerant, improving the volumetric efficiency of the compressor, reducing the power consumption of the compressor, and thereby improving the energy efficiency level of the compressor.

[0051] Referring to Figure 1 , Figure 4 and Figure 5 As shown, it can be understood that a groove 422 is provided at one end of the eccentric portion 420 facing the lower bearing 300. An oil storage cavity 600 is formed between the side wall of the groove 422, the piston 500 and the lower bearing 300. During the operation of the pump body assembly 1000, the crankshaft 400 rotates relative to the lower bearing 300, and the oil storage cavity 600 and the outlet of the fuel injection hole 310 are in a completely overlapping state in the projection plane perpendicular to the axis of the lower bearing 300, that is, the inner diameter of the entire fuel injection hole 310 communicates with the oil storage cavity 600. At this time, when the fuel injection hole 310 is completely communicated with the oil storage cavity 600, the refrigerant oil can more smoothly pass through the fuel injection hole 310 and be injected into the oil storage cavity 600, so that enough refrigerant oil can be filled in the oil storage cavity 600, and under the eccentric rotation of the crankshaft 400, the refrigerant oil can continuously seal the gap between the lower end surface of the piston 500 and the lower bearing 300, reducing the leakage loss of the refrigerant, improving the volumetric efficiency of the compressor, thereby reducing the power consumption of the compressor and improving the energy efficiency level of the compressor.

[0052] To improve the sealing effect of the fuel injection hole 310 on the lower end surface of the piston 500, the embodiment of the present invention defines the angular position where the fuel injection hole 310 is located. A two-dimensional coordinate system is defined on the upper end surface of the lower bearing 300, and for the convenience of demonstrating and explaining each parameter, the coordinate system is projected onto the corresponding position of the lower end surface of the cylinder 100. Referring to Figure 4 as shown, the origin of the coordinate system is the center of the lower bearing 300, the x-axis is the straight line where the center line C of the sliding vane 130 is located, and the y-axis is the straight line perpendicular to the x-axis. The angle where the center line C of the sliding vane 130 is located is 0°, and the clockwise direction is the direction of increasing angle (corresponding to Figure 4 the counterclockwise direction), and the angle θ where the outlet of the fuel injection hole 310 is located is set in the range greater than or equal to 60° and less than or equal to 120°, or set in the range greater than or equal to 240° and less than or equal to 300°. When the angle θ of the fuel injection hole 310 satisfies the above parameter range, during the operation of the pump body assembly 1000, within the duration of one rotation of the crankshaft 400 relative to the lower bearing 300, the proportion of the state where the fuel injection hole 310 is in communication with the gap between the outer edge of the thrust surface 421 and the inner edge of the piston 500 is higher, which is more conducive to the continuous sealing of the lower end surface of the piston 500 by the fuel injection hole 310, reducing the leakage loss of the refrigerant, thereby improving the volumetric efficiency of the compressor, reducing the power consumption of the compressor, and improving the energy efficiency level of the compressor.

[0053] In the embodiment where the oil storage cavity 600 is provided, when the angle θ of the fuel injection hole 310 satisfies the above parameter range, during the operation of the pump body assembly 1000, within the duration of one rotation of the crankshaft 400 relative to the lower bearing 300, the proportion of the state where the fuel injection hole 310 is in communication with the oil storage cavity 600 is higher. Therefore, the oil storage cavity 600 can have sufficient supply of refrigerating oil, which is more conducive to the refrigerating oil sealing the gap between the lower end surface of the piston 500 and the lower bearing 300, improving the sealing effect, reducing the leakage loss of the refrigerant, thereby improving the volumetric efficiency of the compressor, reducing the power consumption of the compressor, and improving the energy efficiency level of the compressor.

[0054] Referring to Figure 4 as shown, it can be understood that the angle θ of the fuel injection hole 310 can also be designed by calculation to satisfy θ = α + γ. Wherein, tanγ = (D2 - d)sin(0.5(π + α) - β) / [(D2 - d)cos(0.5(π + α) - β) + 2e], cosβ = [4esin(α / 2) - D2*d] / 2e(D2 - d)sin(α / 2); α is the exhaust start angle of the compressor, that is, the angle at which the pump body assembly 1000 starts to exhaust, which is a basic parameter of the compressor and can be obtained by measurement, e is the eccentricity of the crankshaft 400, D2 is the outer diameter of the piston 500, d is the diameter of the outlet of the fuel injection hole 310, and β and γ are intermediate quantities in the calculation process. With the fuel injection hole 310 designed with the above parameters, the effect of improving the efficiency of the compressor is relatively ideal.

[0055] Referring to Figure 2 and Figure 3 as shown, it can be understood that a plurality of fuel injection holes 310 may be provided. The outlets of the plurality of fuel injection holes 310 are arranged at intervals on the upper end surface of the lower bearing 300, and each fuel injection hole 310 meets the above-mentioned radial parameter and angular parameter limitations. Therefore, the sealing effect of the refrigerating oil injected by the fuel injection holes 310 on the lower end surface of the piston 500 can be improved, the leakage loss of the refrigerant can be reduced, thereby improving the volumetric efficiency of the compressor, reducing the power consumption of the compressor, and further improving the energy efficiency level of the compressor.

[0056] Referring to Figure 3 as shown, it can be understood that the fuel injection hole 310 may be a straight hole or a tapered hole, both of which can achieve the effect of forming a refrigerating oil seal on the lower end surface of the piston 500 and reducing the outward leakage loss of the refrigerant. When a plurality of fuel injection holes 310 are provided, the plurality of fuel injection holes 310 may be all straight holes or all tapered holes; or some are straight holes and some are tapered holes, which are not specifically limited herein.

[0057] Referring to Figure 3 as shown, it can be understood that the diameter d of the fuel injection hole 310 is 0.5 mm to 1.5 mm. When the above parameters are met, the fuel injection effect of the fuel injection hole 310 is better and the stability is better, and it can avoid the direct communication between the fuel injection hole 310 and the inner circular hole 110 of the cylinder 100 during the operation of the pump body assembly 1000, which affects the compression performance of the pump body assembly 1000. When the diameter d of the fuel injection hole 310 is less than 0.5 mm, the fuel injection hole 310 is not conducive to processing and the fuel injection amount is too small. When the diameter d of the fuel injection hole 310 is greater than 1.5 mm, the reliability of the lower bearing 300 is poor, and there is a risk that the fuel injection hole 310 communicates with the inner circular hole 110 of the cylinder 100 during the operation of the pump body assembly 1000.

[0058] Referring to Figure 1 and Figure 3 as shown, for the pump body assembly 1000 of the embodiment of the present invention, the lower bearing 300 includes a shaft neck portion 320 and a flange portion 330. The shaft neck portion 320 extends along the axial direction of the lower bearing 300, and the shaft neck portion 320 is provided with a bearing hole 321 that slidably cooperates with the main shaft 410 of the crankshaft 400. The flange portion 330 is arranged around the circumference of the shaft neck portion 320. The flange portion 330 may be integrally formed with the shaft neck portion 320. The flange portion 330 is provided with bolt holes arranged at intervals along its circumference and is fixedly connected to the cylinder 100 through a plurality of bolt holes. The inlet of the fuel injection hole 310, that is, the end far from the upper end surface of the lower bearing 300, penetrates to the lower end surface of the shaft neck portion 320( Figure 3As shown in the figure, it penetrates to the outer peripheral surface of the shaft neck portion 320. The inlet of the oil injection hole 310 is arranged at the above position, which is beneficial to ensure the connection between the oil injection hole 310 and the oil sump, so that the refrigeration oil can continuously spray upward to the corresponding position.

[0059] Referring to Figure 6 and Figure 7 As shown in the figure, the pump body assembly 1000 of another embodiment of the present invention has basically the same structure as the above embodiment and can be understood by referring to the above embodiment. The difference lies in that the inlet of the oil injection hole 310, that is, the end far from the upper end surface of the lower bearing 300, penetrates to the lower end surface of the flange portion 330 or penetrates to the outer peripheral surface of the flange portion 330. It can be understood that referring to Figure 7 As shown in the figure, the oil injection hole 310 includes a first hole section 311, a second hole section 312 and a third hole section 313 that are sequentially connected in the up and down direction. The first hole section 311 and the third hole section 313 extend in the up and down direction, the second hole section 312 extends in the radial direction of the lower bearing 300, the second hole section 312 extends to the outer peripheral surface of the flange portion 330, and the third hole section 313 extends to the lower end surface of the flange portion 330. The inlet of the oil injection hole 310 is arranged at the above position, which is also beneficial to ensure the connection between the oil injection hole 310 and the oil sump, so that the refrigeration oil can continuously spray upward to the corresponding position.

[0060] Referring to Figure 1 As shown in the figure, a compressor according to an embodiment of the present invention, for example, a rotary compressor. The compressor according to the embodiment of the present invention includes a housing, a motor assembly and the pump body assembly 1000 of the above embodiment. The motor assembly and the pump body assembly 1000 are both fixedly installed in the housing. The motor assembly includes a stator and a rotor. The rotor is installed on the crankshaft 400 of the pump body assembly 1000. Driven by the motor assembly, the rotor rotates relative to the stator, thereby driving the crankshaft 400 to rotate, and further realizing the intake, compression and exhaust of the pump body assembly 1000.

[0061] The compressor according to the embodiment of the present invention adopts the pump body assembly 1000 of the above embodiment. The pump body assembly 1000 is provided with at least one oil injection hole 310 in the lower bearing 300. The inlet of the oil injection hole 310 penetrates through to the outer peripheral surface or the lower end surface of the lower bearing 300 so as to be able to communicate with the oil sump of the compressor, and the outlet of the oil injection hole 310 penetrates through to the upper end surface of the lower bearing 300; and the distance between the center of the outlet of the oil injection hole 310 and the center of the lower bearing 300 is greater than or equal to the radius of the thrust surface 421 of the eccentric part 420 of the crankshaft 400, and less than or equal to the sum of the eccentricity of the crankshaft 400 and the inner circle radius of the piston 500. During the operation of the compressor, the refrigerating oil enters the gap between the outer edge of the thrust surface 421 and the inner edge of the piston 500 through the oil injection hole 310 from the oil sump, strengthening the seal between the lower end surface of the piston 500 and the lower bearing 300, and being able to supply oil to the lower end surface of the piston 500, reducing the leakage loss of the refrigerant, improving the volumetric efficiency of the compressor, and thus improving the energy efficiency level of the compressor.

[0062] Since the compressor adopts all the technical solutions of the pump body assembly 1000 of the above embodiment, it at least has all the beneficial effects brought by the technical solutions of the above embodiment, which will not be elaborated herein.

[0063] Refer to Figure 1 As shown, a refrigeration device according to an embodiment of the present invention, such as an air conditioner, an air source heat pump water heater, etc. The refrigeration device according to the embodiment of the present invention includes an evaporator, a condenser, a throttling device and the compressor of the above embodiment. The refrigerant ejected from the compressor is condensed by releasing heat through the condenser, then depressurized through the throttling device, then evaporated by absorbing heat through the evaporator, and finally enters the compressor again for recompression, so as to realize the refrigerant cycle of the refrigeration device.

[0064] The refrigeration device according to the embodiment of the present invention adopts the compressor of the above embodiment. The compressor includes a pump body assembly 1000. The pump body assembly 1000 is provided with at least one oil injection hole 310 in the lower bearing 300. The inlet of the oil injection hole 310 penetrates through to the outer peripheral surface or the lower end surface of the lower bearing 300 so as to be able to communicate with the oil sump of the compressor, and the outlet of the oil injection hole 310 penetrates through to the upper end surface of the lower bearing 300; and the distance between the center of the outlet of the oil injection hole 310 and the center of the lower bearing 300 is greater than or equal to the radius of the thrust surface 421 of the eccentric part 420 of the crankshaft 400, and less than or equal to the sum of the eccentricity of the crankshaft 400 and the inner circle radius of the piston 500. During the operation of the compressor, the refrigerating oil enters the gap between the outer edge of the thrust surface 421 and the inner edge of the piston 500 through the oil injection hole 310 from the oil sump, strengthening the seal between the lower end surface of the piston 500 and the lower bearing 300, and being able to supply oil to the lower end surface of the piston 500, reducing the leakage loss of the refrigerant, improving the volumetric efficiency of the compressor, and thus improving the energy efficiency level of the compressor.

[0065] Since the refrigeration equipment adopts all the technical solutions of the compressor in the above embodiment, it at least has all the beneficial effects brought by the technical solutions of the above embodiment, which will not be elaborated here.

[0066] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the present invention within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. Pump body assembly, characterized in that, Comprising: A cylinder; A lower bearing connected to the cylinder, the lower bearing being provided with at least one oil injection hole, an outlet of the oil injection hole penetrating to an upper end face of the lower bearing, and an inlet of the oil injection hole penetrating to an outer peripheral face or a lower end face of the lower bearing; A crankshaft including an eccentric portion provided with a thrust face mating with the upper end face of the lower bearing; A piston sleeved on the eccentric portion, the piston and the eccentric portion being rotatably disposed within the cylinder; Wherein, a distance between a center of the outlet of the oil injection hole and a center of the lower bearing is L, a radius of the thrust face is r, an eccentricity of the crankshaft is e, and an inner diameter of the piston is D1, satisfying: r ≤ L ≤ e + D1 / 2; A diameter of the outlet of the oil injection hole is d, and an outer diameter of the piston is D2, satisfying: L + d / 2 < D2 / 2 - e, so as to reduce leakage loss of refrigerant in the refrigerant oil along the inner edge of the piston to a compression chamber; A groove is provided at one end of the eccentric portion facing the lower bearing, and an oil storage chamber is formed between a side wall of the groove, the piston and the lower bearing. During rotation of the crankshaft relative to the lower bearing, the oil storage chamber and the outlet of the oil injection hole are in a completely coincident state in a projection plane perpendicular to an axis of the lower bearing.

2. The pump body assembly according to claim 1, wherein: During rotation of the crankshaft relative to the lower bearing, the oil storage chamber is in a state of communicating with the oil injection hole.

3. The pump body assembly according to claim 1 or 2, characterized in that: The pump body assembly further includes a sliding vane mounted on the cylinder; a two-dimensional coordinate system is defined on the upper end face of the lower bearing, an origin of the coordinate system is a center of the lower bearing, an x-axis is a straight line where a center line of the sliding vane is located, a y-axis is a straight line perpendicular to the x-axis, an angle where the center line of the sliding vane is located is 0°, and the clockwise direction is the direction of increasing angle. The outlet of the oil injection hole is located in a region of 60° to 120° or 240° to 300°.

4. The pump body assembly according to claim 1, wherein: The diameter of the oil injection hole is 0.5 mm to 1.5 mm.

5. The pump body assembly according to claim 1, wherein: A plurality of the oil injection holes are provided, and outlets of the plurality of oil injection holes are arranged at intervals on the upper end face of the lower bearing.

6. The pump body assembly according to claim 1, wherein: The lower bearing includes a shaft neck portion and a flange portion, and one end of the oil injection hole away from the upper end face of the lower bearing penetrates to a lower end face or an outer peripheral face of the shaft neck portion.

7. The pump body assembly according to claim 1, characterized in that: The lower bearing includes a shaft neck portion and a flange portion, and one end of the oil injection hole away from the upper end face of the lower bearing penetrates to a lower end face or an outer peripheral face of the flange portion.

8. Compressor, characterized in that: Comprising the pump body assembly according to any one of claims 1 to 7.

9. Refrigeration equipment, characterized in that: Comprising the compressor according to claim 8.

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