Compression mechanism, compressor and heat pump system

Abstract

The invention discloses a compressing mechanism, a compressor and a heat pump system, and relates to the technical field of compressors, the compressing mechanism comprises a crankshaft, a main bearing, two air cylinders and an auxiliary bearing, the crankshaft is sequentially sleeved with the main bearing, the two air cylinders and the auxiliary bearing in the axis direction of the crankshaft, and a partition plate is further arranged between the two air cylinders; the main bearing, the two air cylinders, the partition plate and the auxiliary bearing are connected into a whole through a plurality of fasteners. Wherein at least part of the fasteners are first fasteners and second fasteners, and the two air cylinders and the partition plate are connected through the first fasteners; and at least four of the main bearing, the two air cylinders, the partition plate and the auxiliary bearing are connected through second fasteners. According to the technical scheme, the radial retention force of the air cylinders can be improved, the radial displacement of the air cylinders is reduced, and then the reliability of the compressor is improved.

Description

Technical Field

[0001] The present application relates to the technical field of compressors, and in particular to a compression mechanism, a compressor and a heat pump system. Background Art

[0002] As the operating range of rotary compressors expands and they develop towards larger displacements, the displacement of the compression components of two-cylinder compressors becomes prominent. During compressor assembly and operation under harsh working conditions, when the radial load is large, the compression component will undergo radial displacement, resulting in large changes in the gaps between the mating parts, ultimately leading to poor assembly of the compression component or severe wear of the compression component during operation of the compressor, making the compressor unable to operate and increasing the failure rate of the compressor. The displacement of the compression component has seriously restricted the development of the compressor towards larger displacements and limited the scope of use of the compressor. Summary of the Invention

[0003] The main purpose of this application is to propose a compression mechanism, a compressor and a heat pump system, which are intended to reduce the radial displacement of the compression component during the assembly or operation of the compressor, so as to improve the reliability of the compressor as a whole and reduce the failure rate of the compressor.

[0004] To achieve the above-mentioned purpose, the compression mechanism proposed in this application comprises:

[0005] crankshaft; and

[0006] The compression assembly includes a main bearing, two cylinders, and a secondary bearing sequentially sleeved on the crankshaft along the axial direction of the crankshaft, with a partition plate provided between the two cylinders; the main bearing, the two cylinders, the partition plate, and the secondary bearing are connected into a whole by a plurality of fasteners;

[0007] Among them, at least part of the multiple fasteners are first fasteners and second fasteners, and the two cylinders and the partition are connected by the first fasteners; at least four of the five of the main bearing, the two cylinders, the partition and the secondary bearing are connected by the second fasteners.

[0008] In some embodiments, the first fastener includes a head and a screw provided on the head, the head abuts against one of the cylinders, and the screw passes through the two cylinders and the partition; the screw includes a first rod segment and a second rod segment connected to each other, the first rod segment is connected to the head, and the second rod segment is threadedly connected to the cylinder away from the head; the ratio of the length of the first rod segment to the diameter of the first rod segment is less than or equal to 4.

[0009] In some embodiments, the cylinder is provided with a vane groove and a first mounting hole for the first fastener to pass through, the number of the first fasteners and the first mounting holes are arranged in a one-to-one correspondence, and the number of the first fasteners is n1; the number of the first mounting holes is one, and along the circumference of the cylinder, the first mounting hole is located on one side of the vane groove, and the radial angle between the first mounting hole and the vane groove in the cylinder is less than or equal to 30°; or the number of the first mounting holes is multiple, and the multiple first mounting holes are arranged in sequence along the axial direction of the cylinder, and the radial angle between two adjacent first mounting holes in the cylinder is greater than or equal to [-30]° and less than or equal to [+30]°.

[0010] In some embodiments, the sum of the number of the first fasteners and the number of the second fasteners is greater than or equal to the number of the third fasteners.

[0011] In some embodiments, the fastening assembly further includes a fourth fastener, and the fourth fastener is sequentially passed through the secondary bearing and the cylinder close to the secondary bearing.

[0012] In some embodiments, the sum of the number of the second fasteners and the number of the fourth fasteners is greater than or equal to the number of the third fasteners.

[0013] In some embodiments, the first mounting hole on one of the two cylinders includes a first hole section and a second hole section that are connected in sequence along the axial direction, and the first hole section is located at one end of the cylinder close to the partition; the diameter of the first hole section is smaller than the diameter of the second hole section; the head is arranged in the second hole section, and the screw is passed through the first hole section, the partition and the other cylinder.

[0014] In some embodiments, the length of the first hole segment is greater than or equal to 1 mm.

[0015] In some embodiments, the inner wall surface of the cylinder having the first hole segment and the second hole segment is the first wall surface, and the wall surface of the first mounting hole in the second hole segment is the second wall surface; the minimum distance between the first wall surface and the second wall surface is greater than or equal to 1 mm.

[0016] In some embodiments, among the two cylinders, the cylinder located between the main bearing and the partition is the first cylinder, and the cylinder located between the secondary bearing and the partition is the second cylinder; the first fastener is sequentially passed through the second cylinder, the partition and the first cylinder along the extension direction of the axis.

[0017] In some embodiments, the compression assembly further includes a first muffler, the first muffler covering a side of the main bearing facing away from the cylinder, and the third fastener is sequentially provided through the first muffler, the main bearing, and the first cylinder along the axial direction;

[0018] And / or, the compression assembly further includes a second muffler, which covers the side of the bearing facing away from the cylinder; the second fastener is sequentially passed through the second muffler, the second cylinder, the partition and the first cylinder along the axial direction.

[0019] The present application also proposes a compressor, characterized in that the compressor includes the compression mechanism described in any of the aforementioned embodiments.

[0020] The present application also proposes a heat pump system, characterized in that the heat pump system includes the compressor described in any of the aforementioned embodiments.

[0021] The technical solution of the present application, through the synergistic action of the first fastener and the second fastener, the second fastener forms an axially penetrating overall constraint across at least four of the main bearing, cylinder, partition and auxiliary bearing, disperses the radial load to the bearing support end, and reduces the stress concentration on a single fastening point; the first fastener specifically connects the two cylinders and the partition, and the action arm of the first fastener is shorter. The shorter action arm can improve the deformation resistance of the first fastener, thereby forming a high-rigidity local module between the cylinders, directly resisting the radial expansion force generated by the cylinder due to pressure fluctuations, thereby reducing the radial displacement between the cylinders. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0023] Figure 1 A structural schematic diagram of an embodiment of a compression mechanism provided in this application;

[0024] Figure 2 for Figure 1 A structural diagram of another perspective of the embodiment shown;

[0025] Figure 3 for Figure 2 Cross-sectional view of the middle BB;

[0026] Figure 4 for Figure 2 Cross-sectional view of CC;

[0027] Figure 5 for Figure 1 A schematic structural diagram of the auxiliary bearing of the embodiment shown;

[0028] Figure 6 for Figure 1 A schematic structural diagram of the second cylinder of the illustrated embodiment;

[0029] Figure 7 for Figure 6 Cross-sectional view of the middle DD;

[0030] Figure 8 for Figure 1 A schematic structural diagram of the first cylinder of the illustrated embodiment;

[0031] Figure 9 A schematic structural diagram of another embodiment of the compression mechanism provided in this application;

[0032] Figure 10 A structural schematic diagram of another embodiment of the compression mechanism provided by the present application;

[0033] Figure 11 for Figure 4 A graph showing the relationship between the aspect ratio and displacement load of the first fastener in the illustrated embodiment;

[0034] Description of Figure Numbers:

[0035] 10. Compression mechanism; 100. Crankshaft; 101. Axis; 200. Main bearing; 300. Secondary bearing; 400. First cylinder; 500. Second cylinder; 600. Partition; 700. Fastening assembly; 710. First fastener; 711. Head; 712. Screw; 712a. First rod segment; 712b. Second rod segment; 720. Second fastener; 730. Third fastener; 740. Fourth fastener; 701. First mounting hole; 702. Second mounting hole; 703. Third mounting hole; 704. Fourth mounting hole; 800. First muffler; 900. Second muffler; 11. Slide vane slot;

[0036] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0037] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0038] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0039] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0040] As the operating range of rotary compressors expands and they develop towards larger displacements, the displacement of the compression components of two-cylinder compressors becomes prominent. During the assembly of the compressor and operation under harsh working conditions, when the radial load is large, the compression component will undergo radial displacement, especially the second cylinder 500 of the two-cylinder compressor (the cylinder close to the secondary bearing 300). This causes large changes in the gaps between the mating parts, ultimately resulting in poor assembly of the compression component or severe wear of the compression component during operation of the compressor, making the compressor unable to operate and increasing the failure rate of the compressor. The displacement of the compression component seriously restricts the development of the compressor towards larger displacement and limits the scope of use of the compressor.

[0041] This application proposes a compression mechanism 10, which aims to reduce the radial displacement of the compression assembly during the assembly or operation of the compressor, so as to improve the reliability of the compressor and reduce the failure rate of the compressor. Figures 1 to 10 , solid arrows indicate spaces, slots, or holes.

[0042] See also Figure 3 and Figure 4 , and further see Figure 1 and Figure 2In one embodiment of the present application, the compression mechanism 10 includes a crankshaft 100 and a compression assembly, and the compression assembly includes a main bearing 200, two cylinders and a secondary bearing 300, which are sequentially sleeved on the crankshaft 100 along the axis 101 of the crankshaft 100, and a partition 600 is also provided between the two cylinders; the main bearing 200, the two cylinders, the partition 600 and the secondary bearing 300 are connected into a whole by multiple fasteners; wherein, at least part of the multiple fasteners are first fasteners 710 and second fasteners 720, and the two cylinders and the partition 600 are connected by the first fastener 710; at least four of the five of the main bearing 200, the two cylinders, the partition 600 and the secondary bearing 300 are connected by the second fastener 720.

[0043] Among them, the compression mechanism 10 is mainly used in rolling rotor compressors. The basic components of rolling rotor compressors usually include a motor and a compression mechanism 10. The compression mechanism 10 usually includes a cylinder, a roller (rolling rotor or piston), a vane, a crankshaft 100 and an eccentric part, a main bearing 200 and a secondary bearing 300, etc.; further, the cylinder is usually used in a double-cylinder rolling rotor compressor. The double-cylinder rolling rotor compressor usually includes a double-cylinder two-stage rolling rotor compressor (hereinafter referred to as double-cylinder two-stage) and a double-cylinder variable capacity rolling rotor compressor (hereinafter referred to as double-cylinder variable capacity). Double-cylinder two-stage means that the compression process is divided into two stages, which are completed in two cylinders respectively. After the first-stage cylinder performs preliminary compression on the gas, it is cooled by the intercooler and then further compressed to the final pressure by the second-stage cylinder; the double-cylinder variable capacity is to dynamically close one cylinder through control means (such as solenoid valve, unloading mechanism), so that the compressor only runs on a single cylinder when partially loaded, and the two cylinders work simultaneously when fully loaded.

[0044] The crankshaft 100 has an axis 101, and the extension direction of the axis 101 is the direction of the axis 101. The crankshaft 100 drives the rolling rotor (or piston) to perform eccentric rotational motion in the cylinder through the eccentric portion (also known as the crank pin or eccentric journal). In this embodiment, it is mainly used in a two-cylinder compressor, that is, the number of eccentric portions and cylinders is two, each cylinder has an inner cavity, the inner surface of the cylinder is a track for the movement of the vanes and rollers, and is provided with an intake port and an exhaust port connected to the inner cavity. The intake port and the exhaust port are respectively used for gas intake and exhaust. The intake port is located in the low-pressure area of ​​the inner cavity, and the inner cavity portion corresponding to the intake port is the intake cavity. The exhaust port is located in the high-pressure area of ​​the inner cavity, and the inner cavity portion corresponding to the exhaust port is the compression cavity. When the roller rotates, the low-pressure gas enters the compression cavity from the intake port and is discharged from the exhaust port after compression. A slide vane groove 11 is provided between the air intake port and the air exhaust port. A slide vane is provided in the slide vane groove 11. The slide vane is used to separate the air intake chamber and the compression chamber.

[0045] Multiple fasteners, the number of which is not specifically limited herein, are required to connect the main bearing 200, the two cylinders, the partition 600, and the secondary bearing 300 into an integral whole. This connection into an integral whole generally needs to meet the national standards of the relevant industry. In this embodiment, the fasteners can be screws, a combination of bolts and nuts, a combination of studs and nuts, etc., which will not be illustrated one by one here. Preferably, in this application, the fasteners are screws; the following description will be expanded using screws as an example; and for ease of understanding, the cylinder located between the main bearing 200 and the partition 600 is defined as the first cylinder 400, and the cylinder located between the secondary bearing 300 and the partition 600 is defined as the second cylinder 500.

[0046] At least part of the plurality of fasteners is a first fastener 710 and a second fastener 720, that is, the plurality of fasteners includes at least two types of screws, the type of which is generally related to the components they lock; the two cylinders and the partition 600 are connected by the first fastener 710; that is, the first cylinder 400, the partition 600, and the second cylinder 500 are connected by the first fastener 710. In this solution, the first fastener 710 is a screw as an example. Figure 3 As shown, the screw may be sequentially passed through the first cylinder 400, the partition 600, and the second cylinder 500, that is, there is a locking force between the head 711 of the screw and the first cylinder 400; Figure 9 As shown, the screw head 711 can also be sequentially threaded through the second cylinder 500, the partition 600, and the first cylinder 400, that is, a locking force exists between the screw head 711 and the second cylinder 500. At least four of the five components, namely, the main bearing 200, the two cylinders, the partition 600, and the auxiliary bearing 300, are connected via the second fastener 720. In other words, the length of the screw rod 712 of the first fastener 710 is generally less than that of the second screw rod 712.

[0047] At least four of the five elements, the main bearing 200, the two cylinders, the partition 600, and the auxiliary bearing 300, are connected by a second fastener 720. Here, the second fastener 720 can be understood as a second type of fastener, wherein the second fastener 720 is generally provided through the four elements connected in sequence. For example, the five elements, namely, the main bearing 200, the two cylinders, the partition 600, and the auxiliary bearing 300, may be connected by the second fastener 720; the four elements, namely, the main bearing 200, the two cylinders, and the partition 600, may be connected by the second fastener 720; or the four elements, namely, the auxiliary bearing 300, the second cylinder 500, the partition 600, and the first cylinder 400, may be connected by the second fastener 720. The following will use a specific embodiment to introduce, from an overall perspective, how the main bearing 200, the two cylinders, the partition 600, and the auxiliary bearing 300 are connected as a whole by multiple fasteners:

[0048] In one example, the main bearing 200, the first cylinder 400, the partition 600, the second cylinder 500 and the secondary bearing 300 may be connected by a fastener. Taking the fastener as a combination of a bolt and a nut as an example, the bolt may be sequentially passed through the main bearing 200, the first cylinder 400, the partition 600, the second cylinder 500 and the secondary bearing 300, and the nut may be locked on the side of the bolt where the secondary bearing 300 is located; or the bolt may be sequentially passed through the secondary bearing 300, the second cylinder 500, the partition 600, the first cylinder 400 and the main bearing 200, and the nut may be locked on the side of the bolt where the main bearing 200 is located.

[0049] In another example, the auxiliary bearing 300, the second cylinder 500, the partition 600 and the first cylinder 400 may be connected by the second fastener 720. In this embodiment, the second fastener 720 is a screw. The screw may be sequentially inserted into the auxiliary bearing 300, the second cylinder 500, the partition 600 and the first cylinder 400. Of course, in an example, such as Figure 3 As shown, the second muffler 900 is installed on the side of the secondary bearing 300. In this case, it can also be a screw or can be sequentially inserted into the second muffler 900, the secondary bearing 300, the second cylinder 500, the partition 600 and the first cylinder 400. In this embodiment, it is usually necessary to use other solutions. For example, the main bearing 200 and the first cylinder 400 are connected by a third fastener 730. In this case, the third fastener 730 is a screw. Figure 3 As shown, the screw can be sequentially passed through the main bearing 200 and the first cylinder 400 .

[0050] In another example, the main bearing 200, the first cylinder 400, the partition 600, and the second cylinder 500 may be connected by a second fastener, that is, taking the second fastener 720 as a screw as an example, such a screw is sequentially inserted into the main bearing 200, the first cylinder 400, the partition 600, and the second cylinder 500. In this case, it can usually be used in combination with other embodiments, wherein the secondary bearing 300 and the second cylinder 500 may be connected by a fourth fastener 740, taking the fourth fastener 740 as a screw as an example, as shown in FIG. Figure 4 As shown, the screw can be sequentially passed through the secondary bearing 300 and the second cylinder 500. Of course, in one example, as shown in FIG. Figure 4 As shown, the second muffler 900 is replaced on the side of the secondary bearing 300. At this time, it can also be a screw or it can be sequentially penetrated through the second muffler 900, the secondary bearing 300, and the second cylinder 500. Of course, other situations are also possible, which are not listed here one by one.

[0051] Compared with the solution of relying on only a single type of fastener to fix the compression assembly, the single type of fastener needs to bear local and global loads at the same time, which is prone to cause loosening or deformation of the joint surface due to stress concentration; in this embodiment, through the synergistic action of the first fastener 710 and the second fastener 720, the second fastener 720 forms an axially penetrating overall constraint across at least four of the main bearing 200, the cylinder, the partition 600 and the auxiliary bearing 300, dispersing the radial load to the bearing support end, reducing stress concentration on a single fastening point; the first fastener 710 is specifically used to connect the two cylinders and the partition 600. The action arm of the first fastener 710 is shorter. The shorter action arm can improve the deformation resistance of the first fastener 710, thereby forming a high-rigidity local module between the cylinders, directly resisting the radial expansion force generated by the cylinder due to pressure fluctuations, thereby reducing the radial displacement between the cylinders.

[0052] The technical solution of the present application, through the synergistic action of the first fastener 710 and the second fastener 720, the second fastener 720 forms an axially penetrating overall constraint across at least four of the main bearing 200, the cylinder, the partition 600 and the auxiliary bearing 300, disperses the radial load to the bearing support end, and reduces the stress concentration on a single fastening point; the first fastener 710 is specifically used to connect the two cylinders and the partition 600. The action arm of the first fastener 710 is shorter, and the shorter action arm can improve the deformation resistance of the first fastener 710, thereby forming a high-rigidity local module between the cylinders, directly resisting the radial expansion force generated by the cylinder due to pressure fluctuations, thereby reducing the radial displacement between the cylinders.

[0053] In some embodiments, see Figure 3 and Figure 4 The auxiliary bearing 300 , the two cylinders and the partition 600 are connected by a second fastener 720 ; part of the multiple fasteners is a third fastener 730 ; the main bearing 200 and the cylinder close to the main bearing 200 are connected by a third fastener 730 .

[0054] The cylinder near the main bearing 200 refers to the first cylinder 400. Regarding the locking method of the second fastener 720 and the third fastener 730, the auxiliary bearing 300, the two cylinders, and the partition 600 are connected via the second fastener 720. That is, the corresponding positions of the auxiliary bearing 300, the two cylinders, and the partition 600 are each provided with a second mounting hole 702 for the second fastener 720 to pass through. The main bearing 200 and the first cylinder 400 are connected via the third fastener 730. That is, the main bearing 200 and the first cylinder 400 are provided with a third mounting hole 703 for the third fastener 730 to pass through. Generally speaking, the length of the second fastener 720 is greater than the length of the third fastener 730. Compared with the solution of relying on only one type of fasteners to fix the compression components in sequence, this embodiment can significantly improve the radial retaining force at the second cylinder 500 and the auxiliary bearing 300 through the combination of the first fastener 710, the second fastener 720 and the third fastener 730, reduce the radial displacement of the cylinder and the auxiliary bearing 300 of the dual-cylinder compressor, and improve the reliability of the compressor.

[0055] Considering that the end face of the secondary bearing 300 seals the end face of the second cylinder 500, if the radial holding force of the secondary bearing 300 is reduced, the seal of the end face of the secondary bearing 300 is weakened, and there is a risk of leakage. In order to ensure the holding force and end face pressure of the secondary bearing 300, thereby improving the radial holding force of the second cylinder 500 and reducing the radial displacement of the second cylinder 500 and the secondary bearing 300, in some embodiments, please refer to Figure 4 The fastening assembly 700 further includes a fourth fastener 740 , which is sequentially passed through the auxiliary bearing 300 and the cylinder close to the auxiliary bearing 300 .

[0056] The cylinder near the auxiliary bearing 300 is the second cylinder 500. Similar to the previous embodiment, the auxiliary bearing 300 and the second cylinder 500 are each provided with a fourth mounting hole 704 for the fourth fastener 740 to pass through. By providing the fourth fastener 740 between the auxiliary bearing 300 and the second cylinder 500, this embodiment further improves the retaining force between the auxiliary bearing 300 and the second cylinder 500, reduces radial displacement between the second cylinder 500 and the auxiliary bearing 300, and reduces the risk of leakage.

[0057] It should be noted that, in the embodiment of the present application, the first fastener 710 , the second fastener 720 , the third fastener 730 and the fourth fastener 740 are usually sequentially arranged on the compression assembly along the axis 101 .

[0058] In order to further improve the radial holding force of the cylinder, reduce the radial displacement of the cylinder, and improve the reliability of the compressor, in some embodiments, please continue to refer to Figure 3 and Figure 4The first fastener 710 includes a head 711 and a screw 712 provided on the head 711. The head 711 abuts against one of the cylinders, and the screw 712 passes through the two cylinders and the partition 600; the screw 712 includes a first rod segment 712a and a second rod segment 712b connected to each other, the first rod segment 712a is connected to the head 711, and the second rod segment 712b is threadedly connected to the cylinder away from the head 711; the ratio of the length of the first rod segment 712a to the diameter of the first rod segment 712a is less than or equal to 4.

[0059] The first rod segment 712a is inserted through the cylinder near the head 711 and the partition 600, and the second rod segment 712b is inserted through another cylinder. A corresponding threaded hole is provided in the other cylinder so that the second rod segment 712b is threadedly connected to the cylinder. Figure 4 As shown in h, the diameter of the first rod segment 712a is as follows Figure 4 As shown in d, if the first rod segment 712a has a small portion of threads, the diameter of the first rod segment 712a refers to its nominal diameter. The ratio of the length of the first rod segment 712a to the diameter of the first rod segment 712a is less than or equal to 4. For example, the ratio can be 4.0, 3.8, 3.7, 3.6, 3.5, 3.4, 3.2, 3.0, etc., which are not listed here one by one.

[0060] For the convenience of description, the ratio of the length of the first rod segment 712a to the diameter of the first rod segment 712a is referred to as the aspect ratio. In order to verify the technical effect of the technical solution of the present application, when other dimensions are the same, the first fastener 710 with different aspect ratios is selected for experiment, and the following is obtained: Figure 11 The experimental results shown in Figure 11 X represents the aspect ratio of the first fastener 710, and Y represents the displacement load on the first fastener 710, in N. Figure 11 The curve represents the relationship between the aspect ratio of the first fastener 710 and the displacement load. It can be seen that the smaller the ratio of the length of the first rod segment 712a to the diameter of the first rod segment 712a, the greater the displacement load, the better the radial holding force, and the smaller the radial displacement of the cylinder. Of course, this ratio cannot be infinitely small, otherwise it will affect the structural strength of the cylinder.

[0061] In the previous embodiment, the length of the second fastener 720 is greater than the length of the first fastener 710, and also greater than the length of the third fastener 730, that is, the second fastener 720 is a long screw, and the first fastener 710 and the second fastener 720 are short screws; due to the difference in load between long and short screws, and if the distribution uniformity of different screw specifications along the circumference of the cylinder is poor, it will also cause a certain area of ​​the screw load to be larger, and ultimately cause the cylinder to have a large local load and large deformation, which leads to uneven clearance in the compression assembly, reduced compressor performance, and in severe cases, wear of the compression assembly components and reduced reliability. In order to ensure that the axial and radial deformation of the two cylinders are relatively uniform and reduce the radial displacement of the cylinders, in some embodiments, the cylinder is provided with a vane groove 11 and a first mounting hole 701 for the first fastener 710 to pass through, the number of the first fasteners 710 is n1, and the number of the first fasteners 710 and the first mounting holes 701 are set in a one-to-one correspondence; when n1=1, along the circumference of the cylinder, the first mounting hole 701 is located on one side of the vane groove 11, and the radial angle between the first mounting hole 701 and the vane groove 11 in the cylinder is less than or equal to 30°; when n1≥2, multiple first mounting holes 701 are arranged in sequence along the axial direction of the cylinder, and the radial angle between two adjacent first mounting holes 701 in the cylinder is greater than or equal to [(360 / n1)-30]° and less than or equal to [(360 / n1)+30]°.

[0062] like Figure 6 As shown, the number of the first mounting hole 701 corresponds to one, that is, the number of the first fastener 710 is one. In this embodiment, along the circumference of the cylinder, the first mounting hole 701 is located on one side of the slide groove 11, and the angle between the first mounting hole 701 and the slide groove 11 in the radial direction of the cylinder is less than or equal to 30°; this angle can be understood as Figure 6 ɑ1, that is, the first mounting hole 701 is located in any range within 30° on two opposite sides of the sliding slot 11.

[0063] like Figure 6 As shown, when n1≥2, the plurality of first mounting holes 701 are sequentially spaced along the axial direction of the cylinder, and the angle between two adjacent first mounting holes 701 in the radial direction of the cylinder is greater than or equal to [(360 / n1)-30]° and less than or equal to [(360 / n1)+30]°. The angle between the two first mounting holes 701 in the radial direction of the cylinder is the angle formed by the radius of the cylinder passing through the axis (center) of the cylinder in the two first mounting holes 701. This angle can be understood as Figure 6For example, when n1 is equal to 2, the angle between the two first mounting holes 701 in the radial direction of the cylinder is between 150° and 210°; when n1 is equal to 3, the angle between the two first mounting holes 701 in the radial direction of the cylinder is between 90° and 150°; in this example, it can also be understood that the multiple first mounting holes 701 are symmetrical or evenly distributed about the axis of the crankshaft 100.

[0064] In this embodiment, when the number of the first fastener 710 is one, the first fastener 710 is arranged near the slide groove 11. When the number of the first fastener 710 is multiple, the multiple first fasteners 710 are arranged uniformly or relatively uniformly (allowing a small range of deviation) along the circumference of the cylinder, so that the axial and radial deformations of the two cylinders are relatively uniform, thereby reducing the relative radial displacement between the two cylinders.

[0065] Since the number of first fasteners 710 and second fasteners 720 is directly related to the radial holding force of the second cylinder 500, as the number of first fasteners 710 and second fasteners 720 decreases, the holding force decreases accordingly. In the compression assembly, the second cylinder 500 is most susceptible to radial deviation. To improve the radial holding force of the second cylinder 500, in some embodiments, the number of second fasteners 720 is n2 and the number of third fasteners 730 is n3. Here, n1, n2, and n3 satisfy: n1+n2≥n3. In other words, the sum of the number of first fasteners 710 and second fasteners 720 is greater than the number of third fasteners 730.

[0066] Considering that the end face of the secondary bearing 300 seals against the end face of the second cylinder 500, if the radial holding force of the secondary bearing 300 decreases, the seal of the secondary bearing 300 end face will be weakened, posing a risk of leakage. To ensure the holding force and end face pressure of the secondary bearing 300, in some embodiments, the number of second fasteners 720 is n2, the number of third fasteners 730 is n3, and the number of fourth fasteners 740 is n4; where n4, n2, and n3 satisfy: n4 + n2 ≥ n3. In other words, the sum of the number of second fasteners 720 and third fasteners 730 is not less than the number of third fasteners 730.

[0067] In some embodiments, see Figure 3 、 Figure 4 and Figure 10 In order to further improve the rigidity of the first fastener 710, thereby improving the radial holding force of the cylinder, reducing the radial displacement of the cylinder, and improving the reliability of the compressor, the first mounting hole 701 on one of the two cylinders includes a first hole section and a second hole section that are connected in sequence along the axis 101, and the first hole section is located at one end of the cylinder close to the partition 600; the diameter of the first hole section is smaller than the diameter of the second hole section; the head 711 is arranged in the second hole section, and the screw 712 is passed through the first hole section, the partition 600 and the other cylinder.

[0068] Among them, the embodiment can shorten the length of the first rod segment 712a as much as possible by further optimizing the first mounting hole 701, and reduce the ratio of the length of the first rod segment 712a of the first fastener 710 to the diameter of the first rod segment 712a, thereby improving the radial holding force of the cylinder, reducing the radial displacement of the cylinder, and improving the reliability of the compressor.

[0069] Preferably, the length of the first hole section is greater than or equal to 1 mm. Figure 7 As shown in t1, illustratively, the value of t1 includes but is not limited to 1mm, 2mm, 3mm, 5mm, 6mm, 8mm, 9mm, 10mm or above; the length of the first hole segment can also be understood as the thickness of the cylinder at the first hole segment is as small as possible, but at the same time it also needs to meet the processing technology requirements. In this embodiment, the length of the first hole segment is greater than or equal to 1mm, which avoids the first hole segment being too thin to meet the processing technology requirements.

[0070] In some embodiments, in order to ensure the structural strength of the cylinder, the inner wall surface of the cylinder having the first hole section and the second hole section is the first wall surface, and the wall surface of the first mounting hole in the second hole section is the second wall surface; the minimum distance between the first wall surface and the second wall surface is greater than or equal to 1 mm.

[0071] The minimum distance between the first wall and the second wall is greater than or equal to 1 mm. Figure 6 As shown in t2, where the value of t2 includes but is not limited to 1mm, 2mm, 3mm, 5mm, 6mm, 8mm, 9mm, 10mm or above.

[0072] In some embodiments, see Figure 3 and Figure 4 Among the two cylinders, the cylinder located between the main bearing 200 and the partition 600 is the first cylinder 400, and the cylinder located between the secondary bearing 300 and the partition 600 is the second cylinder 500; the first fastener 710 is sequentially penetrated through the second cylinder 500, the partition 600 and the first cylinder 400 along the extension direction of the axis 101.

[0073] Among them, considering that the second cylinder 500 is the most prone to radial deviation in the compression assembly, in this embodiment, the first fastener 710 is sequentially passed through the second cylinder 500, the partition 600 and the first cylinder 400 along the extension direction of the axis 101, that is, there is a locking force between the head 711 of the first fastener 710 and the second cylinder 500, thereby further increasing the radial holding force of the second cylinder 500.

[0074] In order to reduce the noise of the compressor, the compressor is usually also provided with a muffler, usually a muffler is provided on the main bearing 200 side and the secondary bearing 300 side. For the sake of convenience of description, the muffler covering the side of the main bearing 200 away from the cylinder is the first muffler 800, and the muffler covering the side of the secondary bearing 300 away from the cylinder is the second muffler 900.

[0075] In some embodiments, see Figure 3 The compression assembly further includes a first muffler 800, which covers the side of the main bearing 200 facing away from the cylinder. A third fastener 730 is sequentially disposed along the axis 101 through the first muffler 800, the main bearing 200, and the first cylinder 400. In this embodiment, the third fastener 730 also secures the first muffler 800 to the main bearing 200, simplifying the structure of the compression mechanism 10.

[0076] In some embodiments, see Figure 3 The compression assembly further includes a second muffler 900, which covers the side of the bearing facing away from the cylinder. A second fastener 720 is sequentially disposed along the axis 101 through the second muffler 900, the second cylinder 500, the partition 600, and the first cylinder 400. In this embodiment, the second fastener 720 also secures the second muffler 900 to the secondary bearing 300, thereby simplifying the structure of the compression mechanism 10.

[0077] The present application also proposes a compressor, which includes a compression mechanism 10. The specific structure of the compression mechanism 10 refers to the above-mentioned embodiment. Since the present compressor adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0078] The present application also proposes a heat pump system, which includes a compressor. The specific structure of the compression mechanism 10 refers to the above embodiment. Since the compressor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0079] The above description is merely an exemplary embodiment of the present application and does not limit the scope of protection of the present application. All equivalent structural transformations made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect application in other related technical fields are included in the scope of protection of the present application.

Claims

1. A compression mechanism, characterized in that: include: crankshaft; as well as The compression assembly includes a main bearing, two cylinders, and a secondary bearing sequentially sleeved on the crankshaft along the axial direction of the crankshaft, with a partition plate provided between the two cylinders; the main bearing, the two cylinders, the partition plate, and the secondary bearing are connected into a whole by a plurality of fasteners; Among them, at least part of the multiple fasteners are first fasteners and second fasteners, and the two cylinders and the partition are connected by the first fasteners; at least four of the five of the main bearing, the two cylinders, the partition and the secondary bearing are connected by the second fasteners.

2. The compression mechanism according to claim 1, wherein: The secondary bearing, the two cylinders and the partition are connected by the second fastener; Some of the plurality of fasteners are third fasteners; the main bearing and the cylinder close to the main bearing are connected by the third fasteners.

3. The compression mechanism according to claim 2, wherein: The first fastener includes a head and a screw provided on the head, the head abuts against one of the cylinders, and the screw passes through the two cylinders and the partition; The screw comprises a first rod segment and a second rod segment connected to each other, the first rod segment is connected to the head, and the second rod segment is threadedly connected to the cylinder away from the head; A ratio of the length of the first rod segment to the diameter of the first rod segment is less than or equal to 4.

4. The compression mechanism according to claim 3, wherein: The cylinder is provided with a sliding plate groove and a first mounting hole for the first fastener to pass through, the first fasteners and the first mounting holes are arranged in a one-to-one correspondence, and the number of the first fasteners is n1; There is one first mounting hole, and along the circumference of the cylinder, the first mounting hole is located on one side of the sliding vane groove, and the angle between the first mounting hole and the sliding vane groove in the radial direction of the cylinder is less than or equal to 30°; Alternatively, there are multiple first mounting holes, and the multiple first mounting holes are arranged in sequence along the axial direction of the cylinder, and the angle between two adjacent first mounting holes in the radial direction of the cylinder is greater than or equal to [-30]° and less than or equal to [+30]°.

5. The compression mechanism according to claim 4, wherein: The sum of the number of the first fastening members and the number of the second fastening members is greater than or equal to the number of the third fastening members.

6. The compression mechanism according to claim 4, wherein: The fastening assembly further includes a fourth fastener, which is sequentially passed through the secondary bearing and the cylinder close to the secondary bearing.

7. The compression mechanism according to claim 6, wherein: The sum of the number of the second fastening members and the number of the fourth fastening members is greater than or equal to the number of the third fastening members.

8. The compression mechanism according to claim 4, wherein: The first mounting hole on one of the two cylinders includes a first hole segment and a second hole segment arranged in sequence along the axial direction, the first hole segment is located at an end of the cylinder close to the partition; the diameter of the first hole segment is smaller than the diameter of the second hole segment; The head is arranged in the second hole section, and the screw is passed through the first hole section, the partition plate and the other cylinder.

9. The compression mechanism according to claim 8, wherein: The length of the first hole segment is greater than or equal to 1 mm.

10. The compression mechanism according to claim 9, wherein: The inner wall surface of the cylinder having the first hole section and the second hole section is the first wall surface, and the wall surface of the first mounting hole in the second hole section is the second wall surface; the minimum distance between the first wall surface and the second wall surface is greater than or equal to 1 mm.

11. The compression mechanism according to any one of claims 2 to 10, wherein: Of the two cylinders, the cylinder located between the main bearing and the partition is the first cylinder, and the cylinder located between the secondary bearing and the partition is the second cylinder; the first fastener is sequentially passed through the second cylinder, the partition and the first cylinder along the extension direction of the axis.

12. The compression mechanism according to claim 11, wherein: The compression assembly further includes a first muffler, the first muffler covering a side of the main bearing facing away from the cylinder, and the third fastener sequentially passing through the first muffler, the main bearing, and the first cylinder along the axial direction; And / or, the compression assembly further includes a second muffler, which covers the side of the bearing facing away from the cylinder; the second fastener is sequentially passed through the second muffler, the second cylinder, the partition and the first cylinder along the axial direction.

13. A compressor, characterized in that: Comprising a compression mechanism as claimed in any one of claims 1 to 12.

14. A heat pump system, characterized in that: Comprising the compressor of claim 13.

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