A screw rotor, a compressor and an air conditioner

Abstract

The present invention discloses a screw rotor, a compressor and an air conditioner, relating to the technical field of air conditioners, and solving the problem in the prior art that the high-pressure stage rotor and the low-pressure stage rotor of a two-stage twin-screw compressor need to be connected by a coupling, resulting in power loss in transmission and reducing the efficiency of the compressor. The screw rotor of the present invention includes a first-stage rotor, a second-stage rotor and a connection section. The connection section is located between the first-stage rotor and the second-stage rotor, and the first-stage rotor, the connection section and the second-stage rotor are of an integral structure. There is no need for a coupling connection between the first-stage rotor and the second-stage rotor of the screw rotor of the present invention, which can simplify the structure of the screw rotor, improve the transmission efficiency, reduce the power loss in transmission, reduce the loss, and thus improve the efficiency of the compressor.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to a screw rotor, a compressor including the screw rotor, and an air conditioner including the compressor. Background Art

[0002] Compared with a single-stage screw compressor, a two-stage twin-screw compressor has advantages such as a large pressure ratio and a wide operating range, so the two-stage screw compressor is the future development direction of compressors. Currently, the two-stage twin-screw compressor contains two pairs of rotors processed separately, wherein the drive shafts of the two-stage rotors are connected by a coupling, and the two-stage rotors are separately equipped with bearings to bear the axial force and radial force. Due to the above structural limitations, the two-stage twin-screw compressor has at least the following defects compared with the single-stage compressor: (1) The two pairs of rotors need to be processed separately, resulting in a high cost; (2) The drive shafts of the high-pressure stage rotor and the low-pressure stage rotor are connected by a coupling, resulting in power transmission loss and increased loss, leading to a reduction in the compressor efficiency; (3) Bearings need to be equipped at both the suction end and the discharge end of the high-pressure stage rotor and the low-pressure stage rotor. Multiple sets of bearings result in large frictional losses, further reducing the compressor efficiency.

[0003] In addition, considering the structural compactness of the compressor, a slide valve is usually only provided in the high-pressure stage rotor of the two-stage twin-screw compressor to adjust the high-pressure stage VI (VI is the ratio of the suction volume flow rate of the high-pressure stage of the compressor to the discharge volume flow rate of the high-pressure stage of the compressor) through the slide valve, but the slide valve cannot adjust the capacity of the low-pressure stage rotor. If it is necessary to adjust the compressor flow rate, it can only be achieved by adjusting the rotational speed. However, reducing the rotational speed of the rotor will also reduce the efficiency of the compressor. On the other hand, in the prior art, there are also compressors that respectively design a capacity adjustment slide valve in the low-pressure stage rotor and a VI adjustment slide valve in the high-pressure stage rotor. However, setting two adjustment slide valves in one compressor not only makes the compressor structure and control logic complex, but also increases the cost.

[0004] The prior art discloses a semi-hermetic single-stage two-stage screw compressor. The semi-hermetic single-stage two-stage screw compressor includes a housing, a control system, a first rotor, a coupling, and a second rotor. The control system, the first rotor, the coupling, and the second rotor are arranged in the housing. An air inlet is provided at one end of the housing, and an air outlet is provided at the other end of the housing. The first rotor, the coupling, and the second rotor are arranged in sequence along the direction from the air inlet to the air outlet. The first rotor includes a first female rotor and a first male rotor, and the first female rotor meshes with the first male rotor. The second rotor includes a second female rotor and a second male rotor, and the second female rotor meshes with the second male rotor. The first male rotor is connected to the second male rotor through a coupling, and the control system is electrically connected to the first rotor and drives the first rotor to rotate. In the compressor of this technical solution, connecting the first rotor and the second rotor through a coupling not only increases the loss, but also increases the overall length of the compressor.

[0005] Another prior art discloses a self-balancing axial force four-screw mechanical device with gas thrust bearings. The mechanical device uses four screws with symmetrically arranged and oppositely threaded directions. The screws within the same housing mesh with each other in pairs, and the screws on the same axis on different housings have oppositely threaded directions, so that during the normal operation of the mechanical device, the axial forces on the two rotors are basically offset, achieving self-balancing of the axial force; two symmetric thrust bearings are provided on each shaft, so that the remaining axial force on each shaft can be borne by the two symmetric thrust bearings, bearing the relatively small absolute value of the unbalanced axial force that cannot be fully self-balanced, achieving two-way thrust of the bearings at the exhaust end of the four-screw machine and effectively reducing frictional losses. However, in order to balance the axial force, this technical solution cannot achieve double-stage compression. Summary of the Invention

[0006] One object of the present invention is to propose a screw rotor, which solves the technical problem in the prior art that the high-pressure stage rotor and the low-pressure stage rotor of a two-stage twin-screw compressor need to be connected by a coupling, resulting in transmission power loss and reducing the efficiency of the compressor. The many technical effects that can be produced by the preferred technical solution of the present invention are described in detail below.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] The screw rotor of the present invention includes a first-stage rotor, a second-stage rotor, and a connection section. The connection section is located between the first-stage rotor and the second-stage rotor, and the first-stage rotor, the connection section, and the second-stage rotor are of an integral structure.

[0009] According to a preferred embodiment, the first-stage rotor includes a first-stage male rotor and a first-stage female rotor, the first-stage male rotor and the first-stage female rotor mesh with each other, the second-stage rotor includes a second-stage male rotor and a second-stage female rotor, the second-stage male rotor and the second-stage female rotor mesh with each other, and the lead and profile of the first-stage male rotor and the second-stage male rotor are the same, and the lead and profile of the first-stage female rotor and the second-stage female rotor are the same.

[0010] According to a preferred embodiment, the screw rotor further includes a bearing assembly. The bearing assembly includes a plurality of bearings, and the bearings are provided at the suction end of the first-stage rotor and the exhaust end of the second-stage rotor.

[0011] According to a preferred embodiment, the bearing assembly includes a first bearing, a second bearing, a third bearing, and a fourth bearing. Among them, the first bearing and the second bearing are respectively provided at the suction ends of the first-stage male rotor and the first-stage female rotor; the third bearing and the fourth bearing are respectively provided at the exhaust ends of the second-stage male rotor and the second-stage female rotor.

[0012] According to a preferred embodiment, the length-diameter ratio of the first-stage rotor is 1 to 1.7, the length-diameter ratio of the second-stage rotor is 1 to 1.4, and the length-diameter ratio of the first-stage rotor is 0.3 to 0.4 greater than that of the second-stage rotor.

[0013] According to a preferred embodiment, the length-diameter ratio of the first-stage rotor is 1.4 and the length-diameter ratio of the second-stage rotor is 1.

[0014] According to a preferred embodiment, the length of the connecting section is 0.1D to 0.4D, where D is the diameter of the first-stage male rotor.

[0015] According to a preferred embodiment, the total length of the screw rotor is 2.4D to 3.5D, where D is the diameter of the first-stage male rotor.

[0016] According to a preferred embodiment, the screw rotor further includes a slide valve assembly. The slide valve assembly is slidably disposed on the first-stage rotor and the second-stage rotor. When the slide valve assembly slides from the first-stage rotor to the second-stage rotor, the slide valve assembly is used to adjust the VI of the second-stage rotor and / or the volume of the first-stage rotor.

[0017] According to a preferred embodiment, the slide valve assembly at least has a first state in which the suction end completely blocks the suction end of the first-stage rotor. When the slide valve assembly slides in the first state, the slide valve assembly is used to adjust the VI of the second-stage rotor; the slide valve assembly also has a second state in which the suction end partially blocks the suction end of the first-stage rotor. When the slide valve assembly slides in the second state, the slide valve assembly is used to adjust the VI of the second-stage rotor and the volume of the first-stage rotor; the slide valve assembly also has a third state in which the exhaust end contacts the radial exhaust port of the second-stage rotor. When the slide valve assembly slides in the third state, the slide valve assembly is used to adjust the volume of the first-stage rotor.

[0018] The screw rotor provided by the present invention at least has the following beneficial technical effects:

[0019] The screw rotor of the present invention includes a first-stage rotor, a second-stage rotor, and a connecting section. The connecting section is located between the first-stage rotor and the second-stage rotor, and the first-stage rotor, the connecting section, and the second-stage rotor are of an integral structure. On the one hand, for the screw rotor of the present invention, with the connecting section located between the first-stage rotor and the second-stage rotor, the screw rotor can form two pairs of rotors, thus achieving two-stage compression. On the other hand, compared with the two-stage screw rotors in the prior art, there is no need for a coupling connection between the first-stage rotor and the second-stage rotor of the screw rotor of the present invention, which can simplify the structure of the screw rotor, improve the transmission efficiency, reduce the transmission power loss, reduce the loss, and thus improve the compressor efficiency, solving the technical problem in the prior art that the high-pressure-stage rotor and the low-pressure-stage rotor of a two-stage twin-screw compressor need to be connected by a coupling, resulting in transmission power loss and reduced compressor efficiency.

[0020] In addition, the preferred technical solution of the present invention can also produce the following technical effects:

[0021] In the preferred technical solution of the present invention, the first-stage rotor, the connecting section, and the second-stage rotor are of an integral structure, and the leads and profiles of the first-stage male rotor and the second-stage male rotor are the same, and the leads and profiles of the first-stage female rotor and the second-stage female rotor are the same. Compared with the two-stage screw rotors in the prior art, the screw rotor of the preferred technical solution of the present invention can be processed to complete the two-stage rotors with only one processing, with high processing efficiency and low cost, and also solves the technical problem in the prior art that the two pairs of rotors of the two-stage twin-screw rotors need to be processed separately, resulting in high costs.

[0022] The screw rotor of the preferred technical solution of the present invention further includes a bearing assembly. The bearing assembly includes a plurality of bearings, and the bearings are arranged at the suction end of the first-stage rotor and the discharge end of the second-stage rotor. Since the first-stage rotor, the connecting section, and the second-stage rotor are of an integral structure, there is no need for bearing support between the first-stage rotor and the second-stage rotor, and bearings are only arranged at the suction end of the first-stage rotor and the discharge end of the second-stage rotor. Compared with the two-stage screw rotors in the prior art, the screw rotor of the preferred technical solution of the present invention can reduce at least 4 bearings, thus simplifying the structure of the screw rotor, improving the transmission efficiency, reducing the bearing friction loss, reducing the loss, and further improving the compressor efficiency, solving the technical problem in the prior art that bearings need to be equipped at both the suction end and the discharge end of the first-stage rotor and the second-stage rotor, and multiple sets of bearings result in large friction losses.

[0023] In addition, the screw rotor of the preferred technical solution of the present invention further includes a slide valve assembly. The slide valve assembly is slidably disposed on the first-stage rotor and the second-stage rotor. During the process of the slide valve assembly sliding from the first-stage rotor to the second-stage rotor, the slide valve assembly is used to adjust the VI of the second-stage rotor and / or the volume of the first-stage rotor. For the screw rotor of the preferred technical solution of the present invention, through the sliding of the slide valve assembly, not only can the VI of the second-stage rotor be adjusted, but also the volume of the first-stage rotor can be adjusted. Compared with the structure in the prior art where a slide valve is only provided in the high-pressure stage rotor, the screw rotor of the preferred technical solution of the present invention can adjust the compressor capacity without reducing the rotational speed; at the same time, compared with the structure in the prior art where the slide valves are adjusted separately in the high-pressure stage rotor and the low-pressure stage rotor, the screw rotor of the preferred technical solution of the present invention only requires a set of slide valve assemblies, which simplifies the control logic of the screw rotor and streamlines the structure of the screw rotor.

[0024] Another object of the present invention is to provide a compressor.

[0025] The compressor of the present invention includes a housing and a screw rotor. The screw rotor is disposed in the housing, and the screw rotor is the screw rotor according to any one of the technical solutions in the present invention.

[0026] According to a preferred embodiment, the housing includes a first-stage rotor housing and a second-stage rotor housing. The first-stage rotor housing is used to accommodate the first-stage rotor, the second-stage rotor housing is used to accommodate the second-stage rotor, and the first-stage rotor housing and the second-stage rotor housing are connected. A sealing plate is provided on the exhaust end face of the first-stage rotor and the suction end face of the second-stage rotor; or the housing includes a first housing part and a second housing part. The first housing part is used to accommodate the first-stage rotor and the lower part of the second-stage rotor, the second housing part is used to accommodate the upper part of the first-stage rotor and the second-stage rotor, and the first housing part is connected to the second housing part.

[0027] The compressor provided by the present invention has at least the following beneficial technical effects:

[0028] The compressor of the present invention includes the screw rotor according to any one of the technical solutions in the present invention. Through the screw rotor according to any one of the technical solutions in the present invention, the compressor can not only achieve two-stage compression, but also has the advantages of a streamlined structure, high transmission efficiency, and small transmission power loss, which can improve the efficiency of the compressor.

[0029] Another object of the present invention is to provide an air conditioner.

[0030] The air conditioner of the present invention includes the compressor according to any one of the technical solutions in the present invention.

[0031] The air conditioner provided by the present invention has at least the following beneficial technical effects:

[0032] The air conditioner of the present invention, since it includes the compressor of any one of the technical solutions in the present invention, can improve the performance of the air conditioner of the present invention through the compressor of any one of the technical solutions in the present invention. Description of the Drawings

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0034] Figure 1 It is a schematic diagram of the first preferred embodiment of the screw rotor of the present invention;

[0035] Figure 2 It is a schematic diagram before the screw rotor of the present invention is processed;

[0036] Figure 3 It is a schematic diagram of the diameter and end face profile of the first-stage male rotor of the present invention;

[0037] Figure 4 It is a schematic diagram when the slide valve assembly of the present invention is in the first state;

[0038] Figure 5 It is a schematic diagram when the slide valve assembly of the present invention is in a state where the suction end just disengages from the suction end face of the first-stage rotor and the discharge end just contacts the radial discharge port of the second-stage rotor;

[0039] Figure 6 It is a schematic diagram when the slide valve assembly of the present invention is in the third state.

[0040] In the figure: 100, connecting section; 101, first-stage male rotor; 102, first-stage female rotor; 103, second-stage male rotor; 104, second-stage female rotor; 105, first bearing; 106, second bearing; 107, third bearing; 108, fourth bearing; 109, slide valve assembly. Detailed Embodiments

[0041] To make the purpose, technical solutions and advantages of the present invention clearer, the following will describe the technical solutions of the present invention in detail. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by the present invention.

[0042] The following combines the description with the attached drawings Figures 1 to 6The screw rotors, compressors, and air conditioners of the present invention are described in detail with reference to Examples 1 to 3.

[0043] Example 1

[0044] The screw rotor of the present invention is described in detail in this example.

[0045] The screw rotor of this example includes a first-stage rotor, a second-stage rotor, and a connecting section 100, as Figure 1 shown. Preferably, the connecting section 100 is located between the first-stage rotor and the second-stage rotor, and the first-stage rotor, the connecting section 100, and the second-stage rotor are of an integral structure, as Figure 1 shown. The first-stage rotor of this example can also be called the low-pressure-stage rotor, and the second-stage rotor can also be called the high-pressure-stage rotor.

[0046] In the screw rotor of this example, the connecting section 100 is located between the first-stage rotor and the second-stage rotor, which can enable the screw rotor to form two pairs of rotors, thus realizing two-stage compression. On the other hand, compared with the two-stage screw rotors in the prior art, there is no need for a coupling connection between the first-stage rotor and the second-stage rotor of the screw rotor in this example, which can simplify the structure of the screw rotor, improve the transmission efficiency, reduce the transmission power loss, reduce the loss, and thus improve the compressor efficiency, solving the technical problem in the prior art that the high-pressure-stage rotor and the low-pressure-stage rotor of a two-stage twin-screw compressor need to be connected by a coupling, resulting in transmission power loss and reducing the compressor efficiency.

[0047] According to a preferred embodiment, the first-stage rotor includes a first-stage male rotor 101 and a first-stage female rotor 102, the first-stage male rotor 101 and the first-stage female rotor 102 mesh with each other, the second-stage rotor includes a second-stage male rotor 103 and a second-stage female rotor 104, and the second-stage male rotor 103 and the second-stage female rotor 104 mesh with each other, as Figure 1 shown. Preferably, the leads and profiles of the first-stage male rotor 101 and the second-stage male rotor 103 are the same, and the leads and profiles of the first-stage female rotor 102 and the second-stage female rotor 104 are the same, as Figure 1 shown. Figure 3 The schematic diagram of the end face profile of the first-stage male rotor is shown. In the preferred technical solution of this example, the first-stage rotor, the connecting section, and the second-stage rotor are of an integral structure, and the leads and profiles of the first-stage male rotor 101 and the second-stage male rotor 103 are the same, and the leads and profiles of the first-stage female rotor 102 and the second-stage female rotor 104 are the same. Compared with the two-stage screw rotors in the prior art, the screw rotor in the preferred technical solution of this example can be processed into two-stage rotors with only one processing, with high processing efficiency and low cost, solving the technical problem in the prior art that the two pairs of rotors of two-stage twin-screw rotors need to be processed separately, resulting in high costs.

[0048] Figure 2 This is a schematic diagram before the machining of the screw rotor in this embodiment. By not machining the threads on a part of the screw rotor, that is, not machining the threads on the connecting section 100, two pairs of rotors with the same lead and rotor profile can be formed, thereby achieving two-stage compression. The schematic diagram after machining is as shown in Figure 1 shown. Specifically, when machining the screw rotor of the preferred technical solution of this embodiment, only one pass of the milling cutter over the rotor is required to machine the two-stage rotors. The screw rotor of the preferred technical solution of this embodiment can also be machined into an integral rotor first during machining, as shown in Figure 2 shown, and then ground into two sections of rotors for two-stage compression by a tool, as shown in Figure 1 shown.

[0049] According to a preferred embodiment, the screw rotor further includes a bearing assembly. The bearing assembly includes a plurality of bearings, and the bearings are arranged at the suction end of the first-stage rotor and the discharge end of the second-stage rotor. Preferably, the bearing assembly includes a first bearing 105, a second bearing 106, a third bearing 107, and a fourth bearing 108. Among them, the first bearing 105 and the second bearing 106 are respectively arranged at the suction ends of the first-stage male rotor 101 and the first-stage female rotor 102; the third bearing 107 and the fourth bearing 108 are respectively arranged at the discharge ends of the second-stage male rotor 103 and the second-stage female rotor 104, as shown in Figure 1 shown. Since the first-stage rotor, the connecting section 100, and the second-stage rotor are of an integral structure, there is no need for bearing support between the first-stage rotor and the second-stage rotor. The screw rotor of the preferred technical solution of this embodiment only has bearings arranged at the suction end of the first-stage rotor and the discharge end of the second-stage rotor. Compared with the two-stage screw rotors in the prior art, the screw rotor of the preferred technical solution of this embodiment can reduce at least 4 bearings, thereby simplifying the structure of the screw rotor, improving the transmission efficiency, reducing the bearing friction loss, reducing the loss, and solving the technical problem in the prior art that bearings are required at both the suction end and the discharge end of the first-stage rotor and the second-stage rotor, and multiple sets of bearings result in large friction losses.

[0050] According to a preferred embodiment, the length-diameter ratio of the first-stage rotor is 1 to 1.7, the length-diameter ratio of the second-stage rotor is 1 to 1.4, and the length-diameter ratio of the first-stage rotor is 0.3 to 0.4 greater than that of the second-stage rotor. Preferably, the length-diameter ratio of the first-stage rotor is 1.4, and the length-diameter ratio of the second-stage rotor is 1. The length-diameter ratio of the first-stage rotor mentioned in the preferred technical solution of this embodiment is L1 / D, and the length-diameter ratio of the second-stage rotor is L2 / D. Among them, L1 is the length of the first-stage rotor, and L2 is the length of the second-stage rotor; since the diameters of the first-stage male rotor 101 and the second-stage male rotor 103 of the screw rotor in this embodiment are the same, D can be either the diameter of the first-stage male rotor 101 or the diameter of the second-stage male rotor 103. The diameter D of the first-stage male rotor 101 is as shown in Figure 3The diameter shown. In the preferred technical solution of this embodiment, by adjusting the length-diameter ratio of the first-stage rotor and the length-diameter ratio of the second-stage rotor, or rather, adjusting the length and twist angle of the screw rotor, different pressure ratios can be achieved to adapt to different working conditions. In the preferred technical solution of this embodiment, the length-diameter ratio of the first-stage rotor is 0.3 to 0.4 larger than that of the second-stage rotor, which can make the gas volume of the first-stage rotor 30 to 40% larger than that of the second-stage rotor, realizing two-stage compression.

[0051] According to a preferred embodiment, the length of the connecting section 100 is 0.1D to 0.4D, where D is the diameter of the first-stage male rotor 101. In the preferred technical solution of this embodiment, the length of the connecting section 100 being 0.1D to 0.4D facilitates the setting of the exhaust port of the first-stage rotor and the suction port of the second-stage rotor at the connecting section 100, avoiding the situation where the size of the connecting section 100 is too small to set the exhaust port of the first-stage rotor and the suction port of the second-stage rotor, and also avoiding the situation where the size of the connecting section 100 is too large, which affects the overall length of the compressor.

[0052] According to a preferred embodiment, the total length of the screw rotor is 2.4D to 3.5D, where D is the diameter of the first-stage male rotor 101. As Figure 1 shown, in the preferred technical solution of this embodiment, the total length of the screw rotor refers to the sum of the length L1 of the first-stage rotor, the length L3 of the connecting section 100, and the length L2 of the second-stage rotor, that is, L1 + L2 + L3 = 2.4D to 3.5D.

[0053] According to a preferred embodiment, the screw rotor further includes a slide valve assembly 109. The slide valve assembly 109 is slidably arranged on the first-stage rotor and the second-stage rotor, and during the process of the slide valve assembly 109 sliding from the first-stage rotor to the second-stage rotor, the slide valve assembly 109 is used to adjust the VI of the second-stage rotor and / or the volume of the first-stage rotor. Preferably, in this embodiment, the slide valve assembly includes structures such as an oil piston, a slide valve, and a solenoid valve, which can be the same as those in the prior art, but the length of the slide valve is greater than the length of the slide valve in the prior art.

[0054] Preferably, the slide valve assembly 109 at least has a first state in which the suction end completely blocks the suction end of the first-stage rotor. When the slide valve assembly 109 slides in the first state, the slide valve assembly 109 is used to adjust the VI of the second-stage rotor. Specifically, Figure 4 shows a schematic diagram of the slide valve assembly in the first state. As Figure 4 shown, when the slide valve assembly 109 is in the first state and the slide valve assembly 109 slides from the first-stage rotor to the second-stage rotor, the slide valve assembly 109 is only used for the VI of the second-stage rotor, specifically to increase the VI of the second-stage rotor.

[0055] Preferably, the slide valve assembly 109 further has a second state in which the suction end partially blocks the suction end of the first-stage rotor. When the slide valve assembly 109 slides in the second state, the slide valve assembly 109 is used to adjust the VI of the second-stage rotor and the volume of the first-stage rotor. When the slide valve assembly 109 slides from the first state to a position where its suction end just disengages from the suction end of the first-stage rotor, the slide valve assembly 109 enters the second state, as Figure 5 shown. When the slide valve assembly 109 slides in the second state and moves from the first-stage rotor to the second-stage rotor, the slide valve assembly 109 is not only used for the VI of the second-stage rotor, but also can be used to adjust the volume of the first rotor. Specifically, it increases the VI of the second-stage rotor and decreases the volume of the first rotor.

[0056] Preferably, the slide valve assembly 109 further has a third state in which the exhaust end contacts the radial exhaust port of the second-stage rotor. When the slide valve assembly 109 slides in the third state, the slide valve assembly 109 is used to adjust the volume of the first-stage rotor. When the slide valve assembly 109 slides from the second state to a position where its exhaust end contacts the radial exhaust port of the second-stage rotor, the slide valve assembly 109 enters the third state. At this time, the VI of the second-stage rotor has reached the maximum value, as Figure 5 shown. When the slide valve assembly 109 slides in the third state and moves from the first-stage rotor to the second-stage rotor, the slide valve assembly 109 is only used to adjust the volume of the first rotor. Specifically, it decreases the volume of the first rotor.

[0057] For the screw rotor of the preferred technical solution of this embodiment, through the sliding of the slide valve assembly, not only can the VI of the second-stage rotor be adjusted, but also the volume of the first-stage rotor can be adjusted. Compared with the structure in the prior art where a slide valve is only provided in the second-stage rotor, the screw rotor of the preferred technical solution of this embodiment can adjust the compressor capacity without reducing the rotational speed; at the same time, compared with the structure in the prior art where the slide valves are adjusted separately in the first-stage rotor and the second-stage rotor, the screw rotor of the preferred technical solution of this embodiment only requires a set of slide valve assemblies, which simplifies the control logic of the screw rotor and streamlines the structure of the screw rotor.

[0058] According to a preferred embodiment, the screw rotor further includes an air make-up port, which is provided on the connecting section 100 and is used to supply air to the second-stage rotor. The structure and air make-up method of the air make-up port can be the same as those in the prior art and will not be elaborated here.

[0059] Embodiment 2

[0060] This embodiment details the compressor of the present invention.

[0061] The compressor of this embodiment includes a housing and a screw rotor. The screw rotor is disposed within the housing, and the screw rotor is the screw rotor of any one of the technical solutions in Embodiment 1. The remaining structures of the compressor in this embodiment may be the same as those in the prior art and will not be elaborated herein.

[0062] The compressor of this embodiment includes the screw rotor of any one of the technical solutions in Embodiment 1. By means of the screw rotor of any one of the technical solutions in Embodiment 1, not only can the compressor achieve two-stage compression, but it also has the advantages of a streamlined structure, high transmission efficiency, and small transmission power loss, which can improve the efficiency of the compressor.

[0063] According to a preferred embodiment, the housing includes a first-stage rotor housing and a second-stage rotor housing. The first-stage rotor housing is used to accommodate the first-stage rotor, and the second-stage rotor housing is used to accommodate the second-stage rotor. The first-stage rotor housing and the second-stage rotor housing are connected, and a sealing plate is provided on the exhaust end face of the first-stage rotor and the suction end face of the second-stage rotor. More preferably, a casting is provided between the first-stage rotor housing and the second-stage rotor housing, and an axial exhaust port of the first-stage rotor and an axial suction port of the second-stage rotor are provided on the casting, and the axial exhaust port of the first-stage rotor and the axial suction port of the second-stage rotor are communicated. The housing of the preferred technical solution in this embodiment includes a first-stage rotor housing and a second-stage rotor housing. The first-stage rotor housing and the second-stage rotor housing can be connected by a flange, which facilitates the assembly of the integral-structure screw rotor and the housing. On the other hand, a sealing plate is provided on the exhaust end face of the first-stage rotor and the suction end face of the second-stage rotor in the preferred technical solution of this embodiment, which can prevent the problem of leakage of the compressor.

[0064] According to a preferred embodiment, the housing includes a first housing part and a second housing part. The first housing part is used to accommodate the lower part of the first-stage rotor and the second-stage rotor, and the second housing part is used to accommodate the upper part of the first-stage rotor and the second-stage rotor. The first housing part and the second housing part are connected. The housing of the preferred technical solution in this embodiment includes a first housing part and a second housing part, and the two can be connected by a flange, which facilitates the assembly of the integral-structure screw rotor and the housing.

[0065] Embodiment 3

[0066] This embodiment details the air conditioner of the present invention.

[0067] The air conditioner of this embodiment includes the compressor of any one of the technical solutions in Embodiment 2. The remaining structures of the air conditioner in this embodiment may be the same as those in the prior art and will not be elaborated herein.

[0068] The air conditioner of this embodiment, since it includes the compressor of any one of the technical solutions in Embodiment 2, can improve the performance of the air conditioner in this embodiment by means of the compressor of any one of the technical solutions in Embodiment 2.

[0069] In the description of the present invention, it should be noted that unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, terms such as "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0070] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A screw rotor, characterized in that, It includes a first-stage rotor, a second-stage rotor and a connecting section (100). The connecting section (100) is located between the first-stage rotor and the second-stage rotor, and the first-stage rotor, the connecting section (100) and the second-stage rotor are of an integral structure; The screw rotor further includes a slide valve assembly (109). The slide valve assembly (109) is slidably arranged on the first-stage rotor and the second-stage rotor. When the slide valve assembly (109) slides from the first-stage rotor to the second-stage rotor, the slide valve assembly (109) is used to adjust the VI of the second-stage rotor and / or the volume of the first-stage rotor; The slide valve assembly (109) at least has a first state in which the suction end completely blocks the suction end of the first-stage rotor. When the slide valve assembly (109) slides in the first state, the slide valve assembly (109) is used to adjust the VI of the second-stage rotor; The slide valve assembly (109) also has a second state in which the suction end partially blocks the suction end of the first-stage rotor. When the slide valve assembly (109) slides in the second state, the slide valve assembly (109) is used to adjust the VI of the second-stage rotor and the volume of the first-stage rotor; The slide valve assembly (109) also has a third state in which the exhaust end is completely in contact with the radial exhaust port of the second-stage rotor. When the slide valve assembly (109) slides in the third state, the slide valve assembly (109) is used to adjust the volume of the first-stage rotor.

2. The screw rotor according to claim 1, characterized in that, The first-stage rotor includes a first-stage male rotor (101) and a first-stage female rotor (102). The first-stage male rotor (101) and the first-stage female rotor (102) mesh with each other. The second-stage rotor includes a second-stage male rotor (103) and a second-stage female rotor (104). The second-stage male rotor (103) and the second-stage female rotor (104) mesh with each other. The lead and profile of the first-stage male rotor (101) are the same as those of the second-stage male rotor (103), and the lead and profile of the first-stage female rotor (102) are the same as those of the second-stage female rotor (104).

3. The screw rotor according to claim 1, wherein It further includes a bearing assembly. The bearing assembly includes a plurality of bearings, and the bearings are arranged at the suction end of the first-stage rotor and the exhaust end of the second-stage rotor.

4. The screw rotor according to claim 3, characterized in that, The bearing assembly includes a first bearing (105), a second bearing (106), a third bearing (107) and a fourth bearing (108). Among them, the first bearing (105) and the second bearing (106) are respectively arranged at the suction ends of the first-stage male rotor (101) and the first-stage female rotor (102); the third bearing (107) and the fourth bearing (108) are respectively arranged at the exhaust ends of the second-stage male rotor (103) and the second-stage female rotor (104).

5. The screw rotor according to claim 1, characterized in that, The length-diameter ratio of the first-stage rotor is 1 - 1.7, the length-diameter ratio of the second-stage rotor is 1 - 1.4, and the length-diameter ratio of the first-stage rotor is 0.3 - 0.4 greater than that of the second-stage rotor.

6. The screw rotor according to claim 5, characterized in that, The length-diameter ratio of the first-stage rotor is 1.4, and the length-diameter ratio of the second-stage rotor is 1.

7. The screw rotor according to claim 1, wherein The length of the connecting section (100) is 0.1D to 0.4D, where D is the diameter of the first-stage male rotor (101).

8. The screw rotor according to claim 1, characterized in that, The total length of the screw rotor is 2.4D to 3.5D, where D is the diameter of the first-stage male rotor (101).

9. A compressor, characterized in that, It includes a housing and a screw rotor, the screw rotor is arranged in the housing, and the screw rotor is the screw rotor according to any one of claims 1 to 8.

10. The compressor according to claim 9, characterized in that, The housing includes a first-stage rotor housing and a second-stage rotor housing. The first-stage rotor housing is used to accommodate the first-stage rotor, and the second-stage rotor housing is used to accommodate the second-stage rotor. The first-stage rotor housing and the second-stage rotor housing are connected, and a sealing plate is provided on the exhaust end face of the first-stage rotor and the suction end face of the second-stage rotor; or The housing includes a first housing part and a second housing part. The first housing part is used to accommodate the first-stage rotor and the lower part of the second-stage rotor, and the second housing part is used to accommodate the upper part of the first-stage rotor and the second-stage rotor. The first housing part is connected to the second housing part.

11. An air conditioner, characterized in that, It includes the compressor according to claim 9 or 10.

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