Pump body assembly, rotary cylinder pump, and heat exchange apparatus

Abstract

A pump body assembly, a rotary cylinder pump, and a heat exchange apparatus. The pump body assembly comprises a rotary shaft, a cylinder liner and a piston assembly, wherein the rotary shaft and the cylinder liner are eccentrically arranged with a fixed eccentric distance; the piston assembly has a variable volume cavity, the piston assembly is rotatably arranged in the cylinder liner, and the rotary shaft is in driving connection with the piston assembly; the cylinder liner is provided with a liquid suction port and a liquid discharge port; and the cylinder liner is also provided with a buffer groove, the cylinder liner has a liquid suction slot in an inner wall surface thereof, the liquid suction slot is in communication with the liquid suction port via the buffer groove, the buffer groove extends in the circumferential direction of the cylinder liner by a first preset distance to form a buffer groove having an arc-shaped cross section, and the liquid suction slot extends in the circumferential direction of the inner wall surface of the cylinder liner by a second preset distance to form a cross section having two opposite straight segments and arc segments connecting ends of the two straight segments, such that an obtuse angle C or a round angle D is formed at the intersection between the liquid suction slot and the buffer groove, which solves the problem in the prior art of a sharp angle or edge existing at the intersection between an inlet buffer groove and a liquid suction slot of a cylinder liner.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] The present disclosure claims priority to Chinese Patent Application No. 202311770587.X entitled "Pump Body Assembly, Rotary Cylinder Pump and Heat Exchange Device", filed with Chinese Patent Office on December 20, 2023, the entire contents of all of which are incorporated herein by reference.TECHNICAL FIELD

[0002] The present disclosure relates to the technical field of heat exchange systems, in particular to a pump body assembly, a rotary cylinder pump and a heat exchange device.BACKGROUND

[0003] In the fields of data centers, computer room air conditioning, etc., liquid pumps are typically used in place of compressors to drive refrigerants to run in air-conditioning systems, and their energy efficiency is higher than that of conventional air conditioning systems. In the industry, such a system that uses a pump to drive the refrigerant is called a fluorine pump system, and the pump that drives the refrigerant to run is called a fluorine pump.

[0004] However, in existing fluorine pumps, sharp corners or edges are present at the junctions between the inlet buffer groove and liquid suction grooves of the cylinder liners. These sharp edges are prone to burrs and edge warping after machining; moreover, the wall surfaces of the edges are relatively weak and tend to shed and form debris during long-term use. These drawbacks are associated with the failure to resolve sharp corners at intersecting lines.SUMMARY

[0005] A main objective of the present disclosure is to provide a pump body assembly, a rotary cylinder pump, and a heat exchange device, so as to solve the problem of sharp corners or edges at the junction between the inlet buffer groove and the liquid suction groove of the cylinder liner in the related art.

[0006] According to a first aspect of the present disclosure, there is provided a pump body assembly, including a rotating shaft, a cylinder liner and a piston assembly, wherein the rotating shaft and the cylinder liner are arranged eccentrically with a fixed eccentric distance; the piston assembly has a variable-volume chamber and is rotatably disposed in the cylinder liner, and the rotating shaft is drivingly connected with the piston assembly to change a volume of the variable-volume chamber; the cylinder liner is provided with a liquid suction port and a liquid discharge port, wherein the liquid suction port communicates with the variable-volume chamber and delivers refrigerant into the variable-volume chamber, while the liquid discharge port communicates with the variable-volume chamber and discharges the refrigerant from the variable-volume chamber; the cylinder liner is further provided with a buffer groove, and an inner wall surface of the cylinder liner is provided with a liquid suction groove, wherein the liquid suction groove communicates with the liquid suction port through the buffer groove; the buffer groove extends along a circumferential direction of the cylinder liner for a first predetermined distance to form the buffer groove with an arc-shaped cross-section, and the liquid suction groove extends along a circumferential direction of the inner wall surface of the cylinder liner for a second predetermined distance, so as to form a cross-section provided with two straight line segments and two arc segments, the two straight line segments are arranged in opposition, and each of the two arc segments is connected with two ends of the two straight line segments, such that an obtuse angle C or a rounded corner D is formed at a junction between the liquid suction groove and the buffer groove; wherein there are two liquid suction grooves provided, which are arranged at intervals along an axial direction of the cylinder liner, and at least one of the two liquid suction grooves runs through an axial end surface of the cylinder liner.

[0007] In some embodiments, a projection of contour lines of each of the liquid suction groove in the axial direction of the cylinder liner comprises two straight line segments arranged in opposition and an arc segment connecting two ends of the two straight line segments.

[0008] In some embodiments, the two arc segments are bent in the same direction in the radial direction of the cylinder liner.

[0009] In some embodiments, at least one end of the buffer groove runs through the axial end surface of the cylinder liner; or neither of the two ends of the buffer groove runs through the axial end surface of the cylinder liner.

[0010] In some embodiments, the two liquid suction grooves are arranged at intervals along the axial direction of the cylinder liner, and the two liquid suction grooves are both in communication with the buffer groove.

[0011] In some embodiments, a height of a connection part between the two liquid suction grooves in the axial direction of the cylinder liner is Hg 4 , a height of the cylinder liner in the axial direction is Hg 1 , a ratio of Hg 4 to Hg 1 ranges from 0.1 to 0.5.

[0012] In some embodiments, a depth of an upper one of the two liquid suction grooves in the axial direction of the cylinder liner is Hg 2 , a height of the cylinder liner in the axial direction is Hg 1 , a ratio of Hg 2 to Hg 1 ranges from 0.2 to 0.4.

[0013] In some embodiments, a depth of a lower one of the two liquid suction grooves in the axial direction of the cylinder liner is Hg 3 , a height of the cylinder liner in the axial direction is Hg 1 , a ratio of Hg 3 to Hg 1 ranges from 0.2 to 0.4.

[0014] In some embodiments, the liquid suction port has a diameter of Dg 2 , a first flow area of the liquid suction port is Sg 2 , a projection of contour lines of each of the two liquid suction grooves in the axial direction of the cylinder liner comprises two straight line segments, the two straight line segments are arranged in opposition and extending along the axial direction, and there is a distance Wg 2 between the two straight line segments;

[0015] a product of the distance Wg 2 of an upper one of the two liquid suction grooves and an axial depth Hg 2 of the upper one of the two liquid suction grooves is a second flow area Sg 3 of the upper one of the two liquid suction grooves, wherein the ratio of Sg 3 / Sg 2 ranges from 0.3 to 0.7.

[0016] the liquid suction port has a diameter of D g2 , a first flow area of the liquid suction port is S g2 , a projection of contour lines of each of the two liquid suction grooves in the axial direction of the cylinder liner comprises two straight line segments, the two straight line segments are arranged in opposition and extending along the axial direction, and there is a distance W g2 between the two straight line segments;

[0017] a product of the distance W g2 of a lower one of the two liquid suction grooves and an axial depth H g3 of the lower one of the two liquid suction grooves is a third flow area S g4 of the lower one of the two liquid suction grooves, wherein the ratio of S g4 / S g2 ranges from 0.3 to 0.7.

[0018] In some embodiments, the rotating shaft is provided with two eccentric portions along the axial direction, and the piston assembly includes a piston sleeve and a piston. The piston sleeve is rotatably disposed in the cylinder liner and has two limiting channels, which are sequentially arranged along the axial direction of the rotating shaft, and each of the two limiting channels extends in a direction perpendicular to the axial direction of the rotating shaft. The piston has a through hole, and two pistons are provided, wherein the two eccentric portions are inserted into the two through holes of the two pistons respectively, the two pistons are slidably disposed in the two limiting channels respectively, so as to form the variable-volume chamber, which is located in a sliding direction of the piston; and when the rotating shaft rotates to drive the two pistons to reciprocate in the two limiting channels, the two pistons interact with the piston sleeve to result in rotation of the piston sleeve and the two pistons in the cylinder liner.

[0019] In some embodiments, a height of a connection part between the two liquid suction grooves in the axial direction of the cylinder liner is H g4 , a height of a connection part between the two limiting channels in an axial direction of the piston sleeve is H q2 , a ratio of H g4 to H q2 ranges from 1.5 to 4.

[0020] In some embodiments, the ratio of H g4 to H q2 ranges from 2.1 to 3.

[0021] In some embodiments, there is a first phase difference of a first included angle A between the two eccentric portions, and the two eccentric portions have the same eccentricity, and there is a second phase difference of a second included angle B between extending directions of the two limiting channels wherein the first included angle A is twice the second included angle B;

[0022] In some embodiments, the two eccentric portions are oppositely arranged at 180 degrees.

[0023] According to another aspect of the present disclosure, a rotary cylinder pump is provided, which includes the pump body assembly as described above.

[0024] According to another aspect of the present disclosure, a heat exchange device is provided, which includes the rotary cylinder pump as described above.

[0025] In the technical solution of the present disclosure, by making at least one of the two liquid suction grooves run through the axial end surface of the cylinder liner to form an obtuse angle C or a rounded corner D at the junction between the liquid suction groove penetrating the axial end surface of the cylinder liner and the buffer groove, the cylinder liner machined thereby is less prone to burrs and edge warping, and the wall surfaces at the edges are relatively thick, thereby ensuring that the cylinder liner is less prone to shedding and forming debris during long-term service.BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The figures of the description, which constitute a part of the present disclosure, are intended to provide a further understanding of the present disclosure. The illustrative embodiments of the present disclosure and their descriptions are intended to explain the present disclosure, without limiting the present disclosure improperly. In the accompanying drawings: Fig. 1 is a schematic structural view of a cylinder liner of a pump body assembly according to some embodiments of the present disclosure; Fig. 2 is a schematic structural top view of the cylinder liner of Fig. 1; Fig. 3 is a schematic cross-sectional structural view taken along line E-E of Fig. 2; Fig. 4 is a schematic dimensional structural view of the cylinder liner of Fig. 3; Fig. 5 is a schematic dimensional structural view of the cylinder liner of Fig. 3; Fig. 6 is a schematic cross-sectional structural view of the cylinder liner according to some embodiments of the present disclosure; Fig. 7 is a schematic structural view showing the enlarged connection between two liquid suction grooves of the cylinder liner of Fig. 6; Fig. 8 is a schematic structural view of a piston sleeve of the pump body assembly according to some embodiments of the present disclosure; Fig. 9 is a schematic cross-sectional structural view of the piston sleeve taken along line Z-Z of Fig. 8; Fig. 10 is a schematic structural top view of the piston sleeve of Fig. 8.

[0027] The above accompanying drawings include the following reference signs: 20. cylinder liner; 21. liquid suction port; 22. liquid discharge port; 23. buffer groove; 24. liquid suction groove; 30. piston assembly; 31. piston sleeve; 311. limiting channel.DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are merely part rather than all of the embodiments of the present disclosure. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended as a limitation on the present disclosure, its application, or uses. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without paying inventive efforts shall fall within the scope of protection of the present disclosure.

[0029] In order to solve the problem of sharp corners or edges existing at the junctions between the inlet buffer groove and the liquid suction grooves of cylinder liners in the related art, the present disclosure provides a pump body assembly, a rotary cylinder pump, and a heat exchange device, wherein the rotary cylinder pump includes the pump body assembly, and the heat exchange device includes the rotary cylinder pump.

[0030] As shown in Figs. 1 to 10, the pump body assembly includes a rotating shaft, a cylinder liner 20, and a piston assembly 30. The rotating shaft is eccentrically arranged relative to the cylinder liner 20 with a fixed eccentric distance. The piston assembly 30 has a variable-volume chamber, and is rotatably disposed inside the cylinder liner 20. The rotating shaft is drivingly connected with the piston assembly 30 to change the volume of the variable-volume chamber. The cylinder liner 20 is provided with a liquid suction port 21 and a liquid discharge port 22, wherein the liquid suction port 21 communicates with the variable-volume chamber and delivers refrigerant into the variable-volume chamber, while the liquid discharge port 22 communicates with the variable-volume chamber and discharges the refrigerant from the variable-volume chamber. The cylinder liner 20 is further provided with a buffer groove 23, and an inner wall surface of the cylinder liner 20 is provided with a liquid suction groove 24. The liquid suction groove 24 communicates with the liquid suction port 21 through the buffer groove 23. The buffer groove 23 extends along a circumferential direction of the cylinder liner 20 for a first predetermined distance to form a buffer groove 23 with an arc-shaped cross-section, and the liquid suction groove 24 extends along a circumferential direction of the inner wall surface of the cylinder liner 20 for a second predetermined distance, so as to form a cross-section provided with two straight line segments and two arc segments, the two straight line segments are arranged in opposition, and each of the two arc segments is connected with two ends of the two straight line segments, such that an obtuse angle C or a rounded corner D is formed at the junction between the liquid suction groove 24 and the buffer groove 23. There are two liquid suction grooves 24 provided, which are arranged at intervals along an axial direction of the cylinder liner 20, and at least one of the two liquid suction grooves 24 runs through an axial end surface of the cylinder liner 20.

[0031] By making at least one of the two liquid suction grooves 24 run through the axial end surface of the cylinder liner 20, so as to form an obtuse angle C or a rounded corner D at the junction between the two liquid suction grooves 24 running through the axial end surface of the cylinder liner 20 and the buffer groove 23, the cylinder liner 20 produced thereby is less prone to burrs and edge warping, and the wall surfaces at the edges are relatively thick, thereby ensuring that the cylinder liner 20 is less prone to shedding and forming debris during long-term service.

[0032] In some embodiments, the projection of the contour lines of each of the liquid suction grooves 24 in the axial direction of the cylinder liner 20 includes two straight line segments arranged in opposition and an arc segment connecting two ends of the two straight line segments.

[0033] In some embodiments, the two arc segments are bent in the same direction in the radial direction of the cylinder liner 20.

[0034] In some embodiments, at least one end of the buffer groove 23 runs through the axial end surface of the cylinder liner 20; alternatively, neither of the two ends of the buffer groove 23 runs through the axial end surface of the cylinder liner 20.

[0035] As shown in Figs. 1 to 7, there are two liquid suction grooves 24, which are arranged at intervals along the axial direction of the cylinder liner 20, and the two liquid suction grooves 24 are both in communication with the buffer groove 23.

[0036] As shown in Fig. 5, the ratio of the height H g4 of a connection part between the two liquid suction grooves 24 in the axial direction of the cylinder liner 20 to the height H g1 of the cylinder liner 20 in its axial direction ranges from 0.1 to 0.5.

[0037] As shown in Fig. 5, the ratio of a depth H g2 of an upper one of the two liquid suction grooves 24 in the axial direction of the cylinder liner 20 to the height H g1 of the cylinder liner 20 in the axial direction ranges from 0.2 to 0.4.

[0038] As shown in Fig. 5, the ratio of a depth H g3 of a lower one of the two liquid suction grooves 24 in the axial direction of the cylinder liner 20 to the height H g1 of the cylinder liner 20 in the axial direction ranges from 0.2 to 0.4.

[0039] As shown in Figs. 4 and 5, the diameter of the liquid suction port 21 is D g2 , the first flow area of the liquid suction port 21 is S g2 . The two straight line segments of each of the two liquid suction grooves 24 are arranged in opposition and extending along the axial direction, and there is a distance W g2 between the two straight line segments The product of the distance W g2 of the upper one of the two liquid suction grooves 24 and the depth H g2 of the upper one of the two liquid suction grooves 24 in the axial direction of the cylinder liner 20 is a second flow area S g3 of the liquid suction groove 24, and the ratio S g3 / S g2 ranges from 0.3 to 0.7.

[0040] As shown in Figs. 4 and 5, the product of the distance W g2 of the lower one of the two liquid suction grooves 24 and the depth H g3 of the lower one of the two liquid suction grooves 24 in the axial direction of the cylinder liner 20 is a third flow area S g4 of the liquid suction groove 24, and the ratio S g4 / S g2 ranges from 0.3 to 0.7.

[0041] In some embodiments, the rotating shaft is provided with two eccentric portions along the axial direction. The piston assembly 30 includes a piston sleeve 31 and a piston. The piston sleeve 31 is rotatably disposed in the cylinder liner 20 and has two limiting channels 311, which are sequentially arranged along the axial direction of the rotating shaft, and each of the two limiting channels 311 extends in a direction perpendicular to the axial direction of the rotating shaft. The piston has a through hole, and there are two pistons provided. The two eccentric portions are inserted into the two through holes of the two pistons respectively. The two pistons are slidably disposed in the two limiting channels 311 respectively, so as to form the variable-volume chamber, which is located in the sliding direction of the piston. When the rotating shaft rotates to drive the two pistons to reciprocate in the two limiting channels 311, the two pistons interact with the piston sleeve 31 to cause the piston sleeve 31 and the two pistons to rotate in the cylinder liner 20.

[0042] As shown in Figs. 5 and 9, the ratio of the height H g4 of the connection part between the two liquid suction grooves 24 in the axial direction of the cylinder liner 20 to a height H q2 of the connection part between the two limiting channels 311 in the axial direction of the piston sleeve 31 ranges from 1.5 to 4.

[0043] As shown in Figs. 5 and 9, the ratio of H g4 to the H q2 ranges from 2.1 to 3.

[0044] In some embodiments, there is a first phase difference of a first included angle A between the two eccentric portions, and the two eccentric portions have the same eccentricity, and there is a second phase difference of a second included angle B between extending directions of the two limiting channels 311, wherein the first included angle A is twice the second included angle B.

[0045] In some embodiments, the two eccentric portions are oppositely arranged at 180 degrees.

[0046] It should be noted that the terms herein are merely used for describing particular embodiments and are not intended to limit the exemplary embodiments according to the present disclosure. As used herein, the singular forms are intended to include the plural forms as well, unless otherwise clearly indicated. In addition, it should be understood that when the terms "comprise" and / or "include" are used in the description, they specify the presence of stated features, steps, operations, devices, components, and / or combinations thereof.

[0047] Unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure. Meanwhile, it should be understood that the dimensions of the various parts shown in the drawings are not drawn to actual scale for ease of description. The techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods and devices should be regarded as part of the granted description. In all examples shown and discussed herein, any specific values should be construed as merely exemplary rather than being restrictive. Accordingly, other examples of the exemplary embodiments may have different values. It should be noted that like reference signs and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0048] For ease of description, spatially relative terms such as "on...", "above...", "on the upper surface of...", and "upper" may be used herein to describe the spatial positional relationship between one device or feature and other devices or features as shown in the drawings. It should be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawings is turned over, the device described as "above" or "on" other devices or structures will then be oriented as "below" or "underneath" the other devices or structures. Thus, the exemplary term "above..." may encompass two orientations of "above..." and "below...". The device may be otherwise oriented (rotated 90 degrees or at other orientations), and the spatially relative depiction used herein shall be interpreted accordingly.

[0049] It should be noted that the terms herein are merely used for describing particular embodiments and are not intended to limit the exemplary embodiments according to the present disclosure. As used herein, the singular forms are intended to include the plural forms as well, unless otherwise clearly indicated. In addition, it should be understood that when the terms "comprise" and / or "include" are used in the description, they specify the presence of stated features, steps, operations, devices, components, and / or combinations thereof.

[0050] It should be noted that the terms "first", "second", etc. used in the description, claims and the above-mentioned drawings of the present disclosure are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data so used may be exchanged where appropriate, so that the embodiments of the present disclosure described herein can be implemented in sequences other than those illustrated or described herein.

[0051] The foregoing is merely preferred embodiments of the present disclosure and is not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included within the scope of protection of the present disclosure.

Examples

Embodiment Construction

[0028]The technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are merely part rather than all of the embodiments of the present disclosure. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended as a limitation on the present disclosure, its application, or uses. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without paying inventive efforts shall fall within the scope of protection of the present disclosure.

[0029]In order to solve the problem of sharp corners or edges existing at the junctions between the inlet buffer groove and the liquid suction grooves of cylinder liners in the related art, the present disclosure provides a pump body assembly, a rotary cy...

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] The present disclosure claims priority to Chinese Patent Application No. 202311770587.X entitled "Pump Body Assembly, Rotary Cylinder Pump and Heat Exchange Device", filed with Chinese Patent Office on December 20, 2023, the entire contents of all of which are incorporated herein by reference.TECHNICAL FIELD

[0002] The present disclosure relates to the technical field of heat exchange systems, in particular to a pump body assembly, a rotary cylinder pump and a heat exchange device.BACKGROUND

[0003] In the fields of data centers, computer room air conditioning, etc., liquid pumps are typically used in place of compressors to drive refrigerants to run in air-conditioning systems, and their energy efficiency is higher than that of conventional air conditioning systems. In the industry, such a system that uses a pump to drive the refrigerant is called a fluorine pump system, and the pump that drives the refrigerant to run is called a fluorine pump.

[0004] However, in existing fluorine pumps, sharp corners or edges are present at the junctions between the inlet buffer groove and liquid suction grooves of the cylinder liners. These sharp edges are prone to burrs and edge warping after machining; moreover, the wall surfaces of the edges are relatively weak and tend to shed and form debris during long-term use. These drawbacks are associated with the failure to resolve sharp corners at intersecting lines.SUMMARY

[0005] A main objective of the present disclosure is to provide a pump body assembly, a rotary cylinder pump, and a heat exchange device, so as to solve the problem of sharp corners or edges at the junction between the inlet buffer groove and the liquid suction groove of the cylinder liner in the related art.

[0006] According to a first aspect of the present disclosure, there is provided a pump body assembly, including a rotating shaft, a cylinder liner and a piston assembly, wherein the rotating shaft and the cylinder liner are arranged eccentrically with a fixed eccentric distance; the piston assembly has a variable-volume chamber and is rotatably disposed in the cylinder liner, and the rotating shaft is drivingly connected with the piston assembly to change a volume of the variable-volume chamber; the cylinder liner is provided with a liquid suction port and a liquid discharge port, wherein the liquid suction port communicates with the variable-volume chamber and delivers refrigerant into the variable-volume chamber, while the liquid discharge port communicates with the variable-volume chamber and discharges the refrigerant from the variable-volume chamber; the cylinder liner is further provided with a buffer groove, and an inner wall surface of the cylinder liner is provided with a liquid suction groove, wherein the liquid suction groove communicates with the liquid suction port through the buffer groove; the buffer groove extends along a circumferential direction of the cylinder liner for a first predetermined distance to form the buffer groove with an arc-shaped cross-section, and the liquid suction groove extends along a circumferential direction of the inner wall surface of the cylinder liner for a second predetermined distance, so as to form a cross-section provided with two straight line segments and two arc segments, the two straight line segments are arranged in opposition, and each of the two arc segments is connected with two ends of the two straight line segments, such that an obtuse angle C or a rounded corner D is formed at a junction between the liquid suction groove and the buffer groove; wherein there are two liquid suction grooves provided, which are arranged at intervals along an axial direction of the cylinder liner, and at least one of the two liquid suction grooves runs through an axial end surface of the cylinder liner.

[0007] In some embodiments, a projection of contour lines of each of the liquid suction groove in the axial direction of the cylinder liner comprises two straight line segments arranged in opposition and an arc segment connecting two ends of the two straight line segments.

[0008] In some embodiments, the two arc segments are bent in the same direction in the radial direction of the cylinder liner.

[0009] In some embodiments, at least one end of the buffer groove runs through the axial end surface of the cylinder liner; or neither of the two ends of the buffer groove runs through the axial end surface of the cylinder liner.

[0010] In some embodiments, the two liquid suction grooves are arranged at intervals along the axial direction of the cylinder liner, and the two liquid suction grooves are both in communication with the buffer groove.

[0011] In some embodiments, a height of a connection part between the two liquid suction grooves in the axial direction of the cylinder liner is Hg 4 , a height of the cylinder liner in the axial direction is Hg 1 , a ratio of Hg 4 to Hg 1 ranges from 0.1 to 0.5.

[0012] In some embodiments, a depth of an upper one of the two liquid suction grooves in the axial direction of the cylinder liner is Hg 2 , a height of the cylinder liner in the axial direction is Hg 1 , a ratio of Hg 2 to Hg 1 ranges from 0.2 to 0.4.

[0013] In some embodiments, a depth of a lower one of the two liquid suction grooves in the axial direction of the cylinder liner is Hg 3 , a height of the cylinder liner in the axial direction is Hg 1 , a ratio of Hg 3 to Hg 1 ranges from 0.2 to 0.4.

[0014] In some embodiments, the liquid suction port has a diameter of Dg 2 , a first flow area of the liquid suction port is Sg 2 , a projection of contour lines of each of the two liquid suction grooves in the axial direction of the cylinder liner comprises two straight line segments, the two straight line segments are arranged in opposition and extending along the axial direction, and there is a distance Wg 2 between the two straight line segments;

[0015] a product of the distance Wg 2 of an upper one of the two liquid suction grooves and an axial depth Hg 2 of the upper one of the two liquid suction grooves is a second flow area Sg 3 of the upper one of the two liquid suction grooves, wherein the ratio of Sg 3 / Sg 2 ranges from 0.3 to 0.7.

[0016] the liquid suction port has a diameter of D g2 , a first flow area of the liquid suction port is S g2 , a projection of contour lines of each of the two liquid suction grooves in the axial direction of the cylinder liner comprises two straight line segments, the two straight line segments are arranged in opposition and extending along the axial direction, and there is a distance W g2 between the two straight line segments;

[0017] a product of the distance W g2 of a lower one of the two liquid suction grooves and an axial depth H g3 of the lower one of the two liquid suction grooves is a third flow area S g4 of the lower one of the two liquid suction grooves, wherein the ratio of S g4 / S g2 ranges from 0.3 to 0.7.

[0018] In some embodiments, the rotating shaft is provided with two eccentric portions along the axial direction, and the piston assembly includes a piston sleeve and a piston. The piston sleeve is rotatably disposed in the cylinder liner and has two limiting channels, which are sequentially arranged along the axial direction of the rotating shaft, and each of the two limiting channels extends in a direction perpendicular to the axial direction of the rotating shaft. The piston has a through hole, and two pistons are provided, wherein the two eccentric portions are inserted into the two through holes of the two pistons respectively, the two pistons are slidably disposed in the two limiting channels respectively, so as to form the variable-volume chamber, which is located in a sliding direction of the piston; and when the rotating shaft rotates to drive the two pistons to reciprocate in the two limiting channels, the two pistons interact with the piston sleeve to result in rotation of the piston sleeve and the two pistons in the cylinder liner.

[0019] In some embodiments, a height of a connection part between the two liquid suction grooves in the axial direction of the cylinder liner is H g4 , a height of a connection part between the two limiting channels in an axial direction of the piston sleeve is H q2 , a ratio of H g4 to H q2 ranges from 1.5 to 4.

[0020] In some embodiments, the ratio of H g4 to H q2 ranges from 2.1 to 3.

[0021] In some embodiments, there is a first phase difference of a first included angle A between the two eccentric portions, and the two eccentric portions have the same eccentricity, and there is a second phase difference of a second included angle B between extending directions of the two limiting channels wherein the first included angle A is twice the second included angle B;

[0022] In some embodiments, the two eccentric portions are oppositely arranged at 180 degrees.

[0023] According to another aspect of the present disclosure, a rotary cylinder pump is provided, which includes the pump body assembly as described above.

[0024] According to another aspect of the present disclosure, a heat exchange device is provided, which includes the rotary cylinder pump as described above.

[0025] In the technical solution of the present disclosure, by making at least one of the two liquid suction grooves run through the axial end surface of the cylinder liner to form an obtuse angle C or a rounded corner D at the junction between the liquid suction groove penetrating the axial end surface of the cylinder liner and the buffer groove, the cylinder liner machined thereby is less prone to burrs and edge warping, and the wall surfaces at the edges are relatively thick, thereby ensuring that the cylinder liner is less prone to shedding and forming debris during long-term service.BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The figures of the description, which constitute a part of the present disclosure, are intended to provide a further understanding of the present disclosure. The illustrative embodiments of the present disclosure and their descriptions are intended to explain the present disclosure, without limiting the present disclosure improperly. In the accompanying drawings: Fig. 1 is a schematic structural view of a cylinder liner of a pump body assembly according to some embodiments of the present disclosure; Fig. 2 is a schematic structural top view of the cylinder liner of Fig. 1; Fig. 3 is a schematic cross-sectional structural view taken along line E-E of Fig. 2; Fig. 4 is a schematic dimensional structural view of the cylinder liner of Fig. 3; Fig. 5 is a schematic dimensional structural view of the cylinder liner of Fig. 3; Fig. 6 is a schematic cross-sectional structural view of the cylinder liner according to some embodiments of the present disclosure; Fig. 7 is a schematic structural view showing the enlarged connection between two liquid suction grooves of the cylinder liner of Fig. 6; Fig. 8 is a schematic structural view of a piston sleeve of the pump body assembly according to some embodiments of the present disclosure; Fig. 9 is a schematic cross-sectional structural view of the piston sleeve taken along line Z-Z of Fig. 8; Fig. 10 is a schematic structural top view of the piston sleeve of Fig. 8.

[0027] The above accompanying drawings include the following reference signs: 20. cylinder liner; 21. liquid suction port; 22. liquid discharge port; 23. buffer groove; 24. liquid suction groove; 30. piston assembly; 31. piston sleeve; 311. limiting channel.DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are merely part rather than all of the embodiments of the present disclosure. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended as a limitation on the present disclosure, its application, or uses. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without paying inventive efforts shall fall within the scope of protection of the present disclosure.

[0029] In order to solve the problem of sharp corners or edges existing at the junctions between the inlet buffer groove and the liquid suction grooves of cylinder liners in the related art, the present disclosure provides a pump body assembly, a rotary cylinder pump, and a heat exchange device, wherein the rotary cylinder pump includes the pump body assembly, and the heat exchange device includes the rotary cylinder pump.

[0030] As shown in Figs. 1 to 10, the pump body assembly includes a rotating shaft, a cylinder liner 20, and a piston assembly 30. The rotating shaft is eccentrically arranged relative to the cylinder liner 20 with a fixed eccentric distance. The piston assembly 30 has a variable-volume chamber, and is rotatably disposed inside the cylinder liner 20. The rotating shaft is drivingly connected with the piston assembly 30 to change the volume of the variable-volume chamber. The cylinder liner 20 is provided with a liquid suction port 21 and a liquid discharge port 22, wherein the liquid suction port 21 communicates with the variable-volume chamber and delivers refrigerant into the variable-volume chamber, while the liquid discharge port 22 communicates with the variable-volume chamber and discharges the refrigerant from the variable-volume chamber. The cylinder liner 20 is further provided with a buffer groove 23, and an inner wall surface of the cylinder liner 20 is provided with a liquid suction groove 24. The liquid suction groove 24 communicates with the liquid suction port 21 through the buffer groove 23. The buffer groove 23 extends along a circumferential direction of the cylinder liner 20 for a first predetermined distance to form a buffer groove 23 with an arc-shaped cross-section, and the liquid suction groove 24 extends along a circumferential direction of the inner wall surface of the cylinder liner 20 for a second predetermined distance, so as to form a cross-section provided with two straight line segments and two arc segments, the two straight line segments are arranged in opposition, and each of the two arc segments is connected with two ends of the two straight line segments, such that an obtuse angle C or a rounded corner D is formed at the junction between the liquid suction groove 24 and the buffer groove 23. There are two liquid suction grooves 24 provided, which are arranged at intervals along an axial direction of the cylinder liner 20, and at least one of the two liquid suction grooves 24 runs through an axial end surface of the cylinder liner 20.

[0031] By making at least one of the two liquid suction grooves 24 run through the axial end surface of the cylinder liner 20, so as to form an obtuse angle C or a rounded corner D at the junction between the two liquid suction grooves 24 running through the axial end surface of the cylinder liner 20 and the buffer groove 23, the cylinder liner 20 produced thereby is less prone to burrs and edge warping, and the wall surfaces at the edges are relatively thick, thereby ensuring that the cylinder liner 20 is less prone to shedding and forming debris during long-term service.

[0032] In some embodiments, the projection of the contour lines of each of the liquid suction grooves 24 in the axial direction of the cylinder liner 20 includes two straight line segments arranged in opposition and an arc segment connecting two ends of the two straight line segments.

[0033] In some embodiments, the two arc segments are bent in the same direction in the radial direction of the cylinder liner 20.

[0034] In some embodiments, at least one end of the buffer groove 23 runs through the axial end surface of the cylinder liner 20; alternatively, neither of the two ends of the buffer groove 23 runs through the axial end surface of the cylinder liner 20.

[0035] As shown in Figs. 1 to 7, there are two liquid suction grooves 24, which are arranged at intervals along the axial direction of the cylinder liner 20, and the two liquid suction grooves 24 are both in communication with the buffer groove 23.

[0036] As shown in Fig. 5, the ratio of the height H g4 of a connection part between the two liquid suction grooves 24 in the axial direction of the cylinder liner 20 to the height H g1 of the cylinder liner 20 in its axial direction ranges from 0.1 to 0.5.

[0037] As shown in Fig. 5, the ratio of a depth H g2 of an upper one of the two liquid suction grooves 24 in the axial direction of the cylinder liner 20 to the height H g1 of the cylinder liner 20 in the axial direction ranges from 0.2 to 0.4.

[0038] As shown in Fig. 5, the ratio of a depth H g3 of a lower one of the two liquid suction grooves 24 in the axial direction of the cylinder liner 20 to the height H g1 of the cylinder liner 20 in the axial direction ranges from 0.2 to 0.4.

[0039] As shown in Figs. 4 and 5, the diameter of the liquid suction port 21 is D g2 , the first flow area of the liquid suction port 21 is S g2 . The two straight line segments of each of the two liquid suction grooves 24 are arranged in opposition and extending along the axial direction, and there is a distance W g2 between the two straight line segments The product of the distance W g2 of the upper one of the two liquid suction grooves 24 and the depth H g2 of the upper one of the two liquid suction grooves 24 in the axial direction of the cylinder liner 20 is a second flow area S g3 of the liquid suction groove 24, and the ratio S g3 / S g2 ranges from 0.3 to 0.7.

[0040] As shown in Figs. 4 and 5, the product of the distance W g2 of the lower one of the two liquid suction grooves 24 and the depth H g3 of the lower one of the two liquid suction grooves 24 in the axial direction of the cylinder liner 20 is a third flow area S g4 of the liquid suction groove 24, and the ratio S g4 / S g2 ranges from 0.3 to 0.7.

[0041] In some embodiments, the rotating shaft is provided with two eccentric portions along the axial direction. The piston assembly 30 includes a piston sleeve 31 and a piston. The piston sleeve 31 is rotatably disposed in the cylinder liner 20 and has two limiting channels 311, which are sequentially arranged along the axial direction of the rotating shaft, and each of the two limiting channels 311 extends in a direction perpendicular to the axial direction of the rotating shaft. The piston has a through hole, and there are two pistons provided. The two eccentric portions are inserted into the two through holes of the two pistons respectively. The two pistons are slidably disposed in the two limiting channels 311 respectively, so as to form the variable-volume chamber, which is located in the sliding direction of the piston. When the rotating shaft rotates to drive the two pistons to reciprocate in the two limiting channels 311, the two pistons interact with the piston sleeve 31 to cause the piston sleeve 31 and the two pistons to rotate in the cylinder liner 20.

[0042] As shown in Figs. 5 and 9, the ratio of the height H g4 of the connection part between the two liquid suction grooves 24 in the axial direction of the cylinder liner 20 to a height H q2 of the connection part between the two limiting channels 311 in the axial direction of the piston sleeve 31 ranges from 1.5 to 4.

[0043] As shown in Figs. 5 and 9, the ratio of H g4 to the H q2 ranges from 2.1 to 3.

[0044] In some embodiments, there is a first phase difference of a first included angle A between the two eccentric portions, and the two eccentric portions have the same eccentricity, and there is a second phase difference of a second included angle B between extending directions of the two limiting channels 311, wherein the first included angle A is twice the second included angle B.

[0045] In some embodiments, the two eccentric portions are oppositely arranged at 180 degrees.

[0046] It should be noted that the terms herein are merely used for describing particular embodiments and are not intended to limit the exemplary embodiments according to the present disclosure. As used herein, the singular forms are intended to include the plural forms as well, unless otherwise clearly indicated. In addition, it should be understood that when the terms "comprise" and / or "include" are used in the description, they specify the presence of stated features, steps, operations, devices, components, and / or combinations thereof.

[0047] Unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure. Meanwhile, it should be understood that the dimensions of the various parts shown in the drawings are not drawn to actual scale for ease of description. The techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods and devices should be regarded as part of the granted description. In all examples shown and discussed herein, any specific values should be construed as merely exemplary rather than being restrictive. Accordingly, other examples of the exemplary embodiments may have different values. It should be noted that like reference signs and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0048] For ease of description, spatially relative terms such as "on...", "above...", "on the upper surface of...", and "upper" may be used herein to describe the spatial positional relationship between one device or feature and other devices or features as shown in the drawings. It should be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawings is turned over, the device described as "above" or "on" other devices or structures will then be oriented as "below" or "underneath" the other devices or structures. Thus, the exemplary term "above..." may encompass two orientations of "above..." and "below...". The device may be otherwise oriented (rotated 90 degrees or at other orientations), and the spatially relative depiction used herein shall be interpreted accordingly.

[0049] It should be noted that the terms herein are merely used for describing particular embodiments and are not intended to limit the exemplary embodiments according to the present disclosure. As used herein, the singular forms are intended to include the plural forms as well, unless otherwise clearly indicated. In addition, it should be understood that when the terms "comprise" and / or "include" are used in the description, they specify the presence of stated features, steps, operations, devices, components, and / or combinations thereof.

[0050] It should be noted that the terms "first", "second", etc. used in the description, claims and the above-mentioned drawings of the present disclosure are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data so used may be exchanged where appropriate, so that the embodiments of the present disclosure described herein can be implemented in sequences other than those illustrated or described herein.

[0051] The foregoing is merely preferred embodiments of the present disclosure and is not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included within the scope of protection of the present disclosure.

Examples

Embodiment Construction

[0028]The technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are merely part rather than all of the embodiments of the present disclosure. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended as a limitation on the present disclosure, its application, or uses. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without paying inventive efforts shall fall within the scope of protection of the present disclosure.

[0029]In order to solve the problem of sharp corners or edges existing at the junctions between the inlet buffer groove and the liquid suction grooves of cylinder liners in the related art, the present disclosure provides a pump body assembly, a rotary cy...

Claims

1. A pump body assembly, comprising: a rotating shaft; a cylinder liner (20), wherein the rotating shaft and the cylinder liner (20) are arranged eccentrically with a fixed eccentric distance; and a piston assembly (30) having a variable-volume chamber and rotatably disposed in the cylinder liner (20), wherein the rotating shaft is drivingly connected with the piston assembly (30) to change a volume of the variable-volume chamber; wherein the cylinder liner (20) is provided with a liquid suction port (21) and a liquid discharge port (22), wherein the liquid suction port (21) communicates with the variable-volume chamber and delivers refrigerant into the variable-volume chamber, while the liquid discharge port (22) communicates with the variable-volume chamber and discharges the refrigerant from the variable-volume chamber; the cylinder liner (20) is further provided with a buffer groove (23), and an inner wall surface of the cylinder liner (20) is provided with a liquid suction groove (24), wherein the liquid suction groove (24) communicates with the liquid suction port (21) through the buffer groove (23); the buffer groove (23) extends along a circumferential direction of the cylinder liner (20) for a first predetermined distance to form a buffer groove (23) with an arc-shaped cross-section, and the liquid suction groove (24) extends along a circumferential direction of the inner wall surface of the cylinder liner (20) for a second predetermined distance, so as to form a cross-section provided with two straight line segments and two arc segments, the two straight line segments are arranged in opposition, and each of the two arc segments is connected with two ends of the two straight line segments, such that an obtuse angle C or a rounded corner D is formed at a junction between the liquid suction groove (24) and the buffer groove (23); wherein there are two liquid suction grooves (24) provided, which are arranged at intervals along an axial direction of the cylinder liner (20), and at least one of the two liquid suction grooves (24) runs through an axial end surface of the cylinder liner (20).

2. The pump body assembly according to claim 1, wherein a projection of contour lines of each of the liquid suction grooves (24) in the axial direction of the cylinder liner (20) comprises two straight line segments arranged in opposition and an arc segment connecting two ends of the two straight line segments.

3. The pump body assembly according to claim 2, wherein the two arc segments are bent in the same direction in a radial direction of the cylinder liner (20).

4. The pump body assembly according to claim 1, wherein at least one end of the buffer groove (23) runs through the axial end surface of the cylinder liner (20); or neither of the two ends of the buffer groove (23) runs through the axial end surface of the cylinder liner (20).

5. The pump body assembly according to claim 1, wherein the two liquid suction grooves (24) are arranged at intervals along the axial direction of the cylinder liner (20), and the two liquid suction grooves (24) are both in communication with the buffer groove (23).

6. The pump body assembly according to claim 1, wherein a height of a connection part between the two liquid suction grooves (24) in the axial direction of the cylinder liner (20) is Hg4, a height of the cylinder liner (20) in the axial direction is Hg1, a ratio of Hg4 to Hg1 ranges from 0.1 to 0.5.

7. The pump body assembly according to claim 1, wherein a depth of an upper one of the two liquid suction grooves (24) in the axial direction of the cylinder liner (20) is Hg2, a height of the cylinder liner (20) in the axial direction is Hg1, a ratio of Hg2 to Hg1 ranges from 0.2 to 0.4.

8. The pump body assembly according to claim 1, wherein a depth of a lower one of the two liquid suction grooves (24) in the axial direction of the cylinder liner (20) is Hg3, a height of the cylinder liner (20) in the axial direction is Hg1, a ratio of Hg3 to Hg1 ranges from 0.2 to 0.4.

9. The pump body assembly according to claim 1, wherein the liquid suction port (21) has a diameter of Dg2, a first flow area of the liquid suction port (21) is Sg2, a projection of contour lines of each of the two liquid suction grooves (24) in the axial direction of the cylinder liner (20) comprises two straight line segments, the two straight line segments are arranged in opposition and extending along the axial direction, and there is a distance Wg2 between the two straight line segments; a product of the distance Wg2 of an upper one of the two liquid suction grooves (24) and an axial depth Hg2 of the upper one of the two liquid suction grooves (24) is a second flow area Sg3 of the upper one of the two liquid suction grooves (24), wherein the ratio of Sg3 / Sg2 ranges from 0.3 to 0.7.

10. The pump body assembly according to claim 1, wherein the liquid suction port (21) has a diameter of Dg2, a first flow area of the liquid suction port (21) is Sg2, a projection of contour lines of each of the two liquid suction grooves (24) in the axial direction of the cylinder liner (20) comprises two straight line segments, the two straight line segments are arranged in opposition and extending along the axial direction, and there is a distance Wg2 between the two straight line segments; a product of the distance Wg2 of a lower one of the two liquid suction grooves (24) and an axial depth Hg3 of the lower one of the two liquid suction grooves (24) is a third flow area Sg4 of the lower one of the two liquid suction grooves (24), wherein the ratio of Sg4 / Sg2 ranges from 0.3 to 0.7.

11. The pump body assembly according to any one of claims 1 to 10, wherein the rotating shaft is provided with two eccentric portions along the axial direction, and the piston assembly (30) comprises: a piston sleeve (31) rotatably disposed in the cylinder liner (20) and having two limiting channels (311), wherein the two limiting channels (311) are sequentially arranged along the axial direction of the rotating shaft, and each of the two limiting channels (311) extends in a direction perpendicular to the axial direction of the rotating shaft; and a piston having a through hole, wherein two pistons are provided, and the two eccentric portions are inserted into the two through holes of the two pistons respectively, the two pistons are slidably disposed in the two limiting channels (311) respectively, so as to form the variable-volume chamber, which is located in a sliding direction of the piston; when the rotating shaft rotates to drive the two pistons to reciprocate in the two limiting channels (311), the two pistons interact with the piston sleeve (31) to result in rotation of the piston sleeve (31) and the two pistons in the cylinder liner (20).

12. The pump body assembly according to claim 11, wherein a height of a connection part between the two liquid suction grooves (24) in the axial direction of the cylinder liner (20) is Hg4, a height of a connection part between the two limiting channels (311) in an axial direction of the piston sleeve (31) is Hq2, a ratio of Hg4 to Hq2 ranges from 1.5 to 4.

13. The pump body assembly according to claim 12, wherein the ratio of Hg4 to Hq2 ranges from 2.1 to 3.

14. The pump body assembly according to claim 11, wherein there is a first phase difference of a first included angle A between the two eccentric portions, and the two eccentric portions have the same eccentricity, and there is a second phase difference of a second included angle B between extending directions of the two limiting channels (311), wherein the first included angle A is twice the second included angle B.

15. The pump body assembly according to claim 14, wherein the two eccentric portions are oppositely arranged at 180 degrees.

16. A rotary cylinder pump, comprising a pump body assembly according to any one of claims 1 to 15.

17. A heat exchange device, comprising a rotary cylinder pump according to claim 16.

Images