A single-unit two-stage screw compressor
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-22
- Publication Date
- 2026-08-14
AI Technical Summary
一级压缩部件与二级压缩部件的传动方式通常采用齿轮传动或联轴器传动，但是这两种传动方式存在结构复杂，加工制作成本高，安装繁琐等弊端
[0014]本实用新型由于采用了上述结构，具有的有益效果：第一、单机双级螺杆式压缩机的第一级压缩部件和第二级压缩部件之间采用凹凸嵌配的方式直接连接传动，安装时，直接将一根阳转子端部的凸台嵌入另一根阳转子端部的凹槽中，无需安装其他零部件及紧固件，成本低廉、安装方便；第二、传统齿轮传动和联轴器传动的舍弃，采用本技术方案，使得整机传动效率更高，结构简单，整机长度缩短，更有利于整机在压缩系统中的布置安装。
Smart Images
Figure CN224634726U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of compressor technology, specifically relating to a single-unit two-stage screw compressor. Background Technology
[0002] With the development of modern technology, screw compressors have made significant breakthroughs in energy efficiency, materials, intelligence, economy, and environmental protection. In particular, two-stage screw air compressors are developing towards compactness and energy efficiency. A typical single-unit two-stage screw compressor consists of four parts: a drive unit, a primary compression unit, a secondary compression unit, and auxiliary components. The primary and secondary compression units can be connected in series or in parallel. In the series connection, the drive unit drives the primary compression unit, and the primary and secondary compression units form a series structure in the airflow channel. Specifically, air first flows into the primary compression unit for initial compression. In this stage, the compression ratio is usually low. The compressed air is cooled by an intercooler to reduce energy consumption, and then enters the secondary compression unit for further compression. In this stage, the compression ratio is higher than that of the primary stage, ultimately generating high-pressure compressed air. The transmission method between the primary and secondary compression units usually uses gear transmission or coupling transmission. However, these two transmission methods have drawbacks such as complex structure, high manufacturing cost, and cumbersome installation.
[0003] In view of the aforementioned existing technology, it is necessary to make reasonable improvements to the existing single-unit two-stage screw compressor structure. To this end, the applicant has made beneficial designs, and the technical solution described below arises from this background. Utility Model Content
[0004] The objective of this invention is to provide a single-unit two-stage screw compressor in which the first-stage male rotor and the second-stage male rotor are directly driven by end-fitting, resulting in higher overall transmission efficiency, fewer parts involved, and simpler assembly.
[0005] The present invention achieves its objective as follows: a single-stage two-stage screw compressor includes a motor, a first-stage compression component, and a second-stage compression component. The first-stage and second-stage compression components are arranged horizontally in one direction. The first-stage compression component includes a first-stage housing, a first-stage male rotor, a first-stage female rotor, and a first-stage bearing housing. The motor and the first-stage bearing housing are respectively mounted at both ends of the first-stage housing. The first-stage male rotor and the first-stage female rotor are meshed and installed in the inner cavity of the first-stage housing. The second-stage compression component includes a second-stage housing, a second-stage male rotor, and a second-stage female rotor. The second-stage bearing housing, the first-stage bearing housing and the second-stage bearing housing are respectively installed at both ends of the second-stage housing. The second-stage male rotor and the second-stage female rotor are meshed and installed in the inner cavity of the second-stage housing. The motor directly drives the first-stage male rotor of the first-stage compression component to rotate. The feature is that: the opposite ends of the first-stage male rotor and the second-stage male rotor both extend into the first-stage bearing housing, and a groove is opened on one end of each of them. The other end of each of them has a boss corresponding to the groove. The direct connection and transmission between the ends of the first-stage male rotor and the second-stage male rotor are realized through the mutual fitting of the boss and the groove.
[0006] In a specific embodiment of this utility model, a groove is provided on the end of the first-stage male rotor, and a boss corresponding to the groove on the first-stage male rotor is provided on the end of the second-stage male rotor. During installation, the boss at the end of the second-stage male rotor is embedded into the groove at the end of the first-stage male rotor to achieve direct connection and transmission between the ends of the two rotors.
[0007] In another specific embodiment of this utility model, the first-stage male rotor has a boss at its end, and the second-stage male rotor has a groove at its end for the boss on the first-stage male rotor to be inserted. During installation, the boss at the end of the first-stage male rotor is inserted into the groove at the end of the second-stage male rotor to achieve direct connection and transmission between the ends of the two rotors.
[0008] In another specific embodiment of this utility model, the groove is shaped like a straight line, a cross, a polygon, or a plum blossom, and the protrusion is also shaped like a straight line, a cross, a polygon, or a plum blossom.
[0009] In another specific embodiment of this utility model, the groove is composed of a plurality of holes arranged together, and the boss is composed of a plurality of protrusions that can be inserted into the holes of the groove arranged together.
[0010] In another specific embodiment of this utility model, the first-stage male rotor and the first-stage female rotor are horizontally distributed. The two ends of the shaft of the first-stage male rotor are rotatably mounted on the bearing mounting holes of the first-stage housing and the first-stage bearing seat respectively through bearings. The two ends of the shaft of the first-stage female rotor are rotatably mounted on the bearing mounting holes of the first-stage housing and the first-stage bearing seat respectively through bearings.
[0011] In a further specific embodiment of this utility model, one end of the first-stage male rotor extends into the motor housing of the motor and serves as the mounting shaft of the motor rotor, that is, the motor shaft of the motor and the first-stage male rotor share the same shaft.
[0012] In a further specific embodiment of this utility model, the motor is a synchronous motor or an asynchronous motor.
[0013] In yet another specific embodiment of this utility model, the second-stage male rotor and the second-stage female rotor are horizontally distributed. The two ends of the shaft of the second-stage male rotor are rotatably mounted on the bearing mounting holes of the second-stage housing and the second-stage bearing seat through bearings, respectively. The two ends of the shaft of the second-stage female rotor are rotatably mounted on the bearing mounting holes of the second-stage housing and the second-stage bearing seat through bearings, respectively.
[0014] Due to the aforementioned structure, this utility model has the following advantages: First, the first and second stage compression components of the single-unit two-stage screw compressor are directly connected and driven by a concave-convex fitting method. During installation, the boss at the end of one male rotor is directly embedded into the groove at the end of the other male rotor, eliminating the need for other parts and fasteners, resulting in low cost and convenient installation. Second, the abandonment of traditional gear transmission and coupling transmission, coupled with this technical solution, leads to higher overall transmission efficiency, simpler structure, shorter overall length, and is more conducive to the arrangement and installation of the entire machine in the compression system. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of a single-unit two-stage screw compressor according to one embodiment of the present invention; Figure 2a This is a schematic diagram of the groove at the end of the first-stage male rotor in one embodiment of the present invention; Figure 2b This is a schematic diagram of the boss at the end of the second-stage male rotor in one embodiment of the present invention; Figure 3a This is a schematic diagram of the groove at the end of the first-stage male rotor in another embodiment of the present invention; Figure 3b This is a schematic diagram of the boss at the end of the second-stage male rotor in another embodiment of the present invention; In the diagram: 1. Motor, 11. Motor housing, 12. Motor rotor; 2. First-stage compression component, 21. First-stage housing, 22. First-stage male rotor, 23. First-stage female rotor, 24. First-stage bearing housing; 3. Second-stage compression component, 31. Second-stage housing, 32. Second-stage male rotor, 33. Second-stage female rotor, 34. Second-stage bearing housing; 4. Groove; 5. Boss. Detailed Implementation
[0016] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. However, the description of the embodiments is not a limitation on the technical solution. Any formal but not substantive changes made based on the concept of this utility model should be considered within the protection scope of this utility model.
[0017] In the following description, all directional or orientational concepts involving up, down, left, right, front, and back are based on the positions shown in the corresponding figures, and therefore should not be construed as a special limitation on the technical solution provided by this utility model.
[0018] Please see Figure 1 This utility model relates to a single-unit two-stage screw compressor, including a motor 1, a first-stage compression component 2, and a second-stage compression component 3. The motor 1 directly drives the first-stage male rotor 22 of the first-stage compression component 2 to rotate. The first-stage compression component 2 and the second-stage compression component 3 are arranged horizontally in one direction.
[0019] The first-stage compression component 2 includes a first-stage housing 21, a first-stage male rotor 22, a first-stage female rotor 23, and a first-stage bearing housing 24. The motor 1 and the first-stage bearing housing 24 are respectively mounted at both ends of the first-stage housing 21. The first-stage male rotor 22 and the first-stage female rotor 23 mesh with each other and are horizontally mounted in the inner cavity of the first-stage housing 21. The two ends of the shaft of the first-stage male rotor 22 are rotatably mounted on the bearing mounting holes of the first-stage housing 21 and the first-stage bearing housing 24 via bearings, and the two ends of the shaft of the first-stage female rotor 22 are rotatably mounted on the bearing mounting holes of the first-stage housing 21 and the first-stage bearing housing 24 via bearings.
[0020] One end of the first-stage male rotor 22 extends into the motor housing 11 of the motor 1 and serves as the mounting shaft for the motor rotor 12. That is, the motor shaft of the motor 1 and the first-stage male rotor 22 share the same shaft, which improves the transmission efficiency of the motor, reduces the mechanical failure rate, and makes the structure compact. The motor 1 is a synchronous motor or an asynchronous motor.
[0021] The second-stage compression component 3 includes a second-stage housing 31, a second-stage male rotor 32, a second-stage female rotor 33, and a second-stage bearing seat 34. The first-stage bearing seat 24 and the second-stage bearing seat 34 are respectively installed at both ends of the second-stage housing 31. The second-stage male rotor 32 and the second-stage female rotor 33 mesh with each other and are horizontally installed in the inner cavity of the second-stage housing 31. The two ends of the shaft of the second-stage male rotor 31 are rotatably mounted on the bearing mounting holes of the second-stage housing 31 and the second-stage bearing seat 34 via bearings, respectively. The two ends of the shaft of the second-stage female rotor 33 are rotatably mounted on the bearing mounting holes of the second-stage housing 31 and the second-stage bearing seat 34 via bearings, respectively.
[0022] like Figures 1 to 3b As shown, the opposite ends of the first-stage male rotor 22 and the second-stage male rotor 32 both extend into the first-stage bearing seat 24, and a groove 4 is provided on one end of each of them, while a boss 5 corresponding to the groove 4 is provided on the other end of each of them. The direct connection and transmission between the ends of the first-stage male rotor 22 and the second-stage male rotor 32 are realized through the mutual fitting of the boss 5 and the groove 4.
[0023] like Figures 1 to 3b As shown, specifically, the first-stage male rotor 22 has a groove 4 at its end, and the second-stage male rotor 32 has a boss 5 at its end that fits into the groove 4 on the first-stage male rotor 22. During installation, the boss 5 at the end of the second-stage male rotor 32 is directly inserted into the groove 4 at the end of the first-stage male rotor 22 to achieve direct connection and transmission between the two ends. Alternatively, the first-stage male rotor 22 has a boss 5 at its end, and the second-stage male rotor 32 has a groove 4 at its end for the boss 5 to fit into. During installation, the boss 5 at the end of the first-stage male rotor 22 is directly inserted into the groove 4 at the end of the second-stage male rotor 32 to achieve direct connection and transmission between the two ends. The groove 4 can be in the shape of a straight line, a cross, a polygon, or a plum blossom shape, etc., and the boss 5 that fits into the groove 4 can also be in the shape of a straight line, a cross, a polygon, or a plum blossom shape. Figure 2a , Figure 2b The cross shape is shown in the diagram. Figure 3a , Figure 3b The diagram illustrates a straight line shape. Alternatively, if the groove 4 is composed of multiple holes, then the boss 5 is composed of multiple protrusions that can be inserted into the holes of the groove 4. The interlocking connection between the two male rotors eliminates the gear drive or coupling drive found in existing technologies, improving transmission efficiency, shortening the length of the single-unit two-stage screw compressor, simplifying the structure, and reducing costs.
Claims
1. A single-unit two-stage screw compressor, comprising a motor (1), a first-stage compression component (2), and a second-stage compression component (3), wherein the first-stage compression component (2) and the second-stage compression component (3) are arranged horizontally in one direction, wherein the first-stage compression component (2) comprises a first-stage housing (21), a first-stage male rotor (22), a first-stage female rotor (23), and a first-stage bearing housing (24), wherein the motor (1) and the first-stage bearing housing (24) are respectively mounted at both ends of the first-stage housing (21), and the first-stage male rotor (22) and the first-stage female rotor (23) mesh with each other. The second-stage compression component (3) is installed in the inner cavity of the first-stage housing (21). It includes a second-stage housing (31), a second-stage male rotor (32), a second-stage female rotor (33), and a second-stage bearing seat (34). The first-stage bearing seat (24) and the second-stage bearing seat (34) are respectively installed at both ends of the second-stage housing (31). The second-stage male rotor (32) and the second-stage female rotor (33) are meshed and installed in the inner cavity of the second-stage housing (31). The motor (1) directly drives the first-stage male rotor (22) of the first-stage compression component (2) to rotate. The characteristic feature is that: The opposite ends of the first-stage male rotor (22) and the second-stage male rotor (32) both extend into the first-stage bearing seat (24), and a groove (4) is provided on one end of each of them. The other end of each of them has a boss (5) corresponding to the groove (4). The direct connection and transmission between the ends of the first-stage male rotor (22) and the second-stage male rotor (32) are realized by the mutual fitting of the boss (5) and the groove (4).
2. The single-unit two-stage screw compressor according to claim 1, characterized in that: The first-stage male rotor (22) has a groove (4) at its end, and the second-stage male rotor (32) has a boss (5) at its end that corresponds to the groove (4) on the first-stage male rotor (22). During installation, the boss (5) at the end of the second-stage male rotor (32) is inserted into the groove (4) at the end of the first-stage male rotor (22) to achieve direct connection and transmission between the ends of the two rotors.
3. A single-unit two-stage screw compressor according to claim 1, characterized in that: The first-stage male rotor (22) has a boss (5) at its end, and the second-stage male rotor (32) has a groove (4) at its end for the boss (5) on the first-stage male rotor (22) to be inserted. During installation, the boss (5) at the end of the first-stage male rotor (22) is inserted into the groove (4) at the end of the second-stage male rotor (32) to achieve direct connection and transmission between the ends of the two rotors.
4. A single-unit two-stage screw compressor according to claim 2 or 3, characterized in that: The groove (4) is shaped like a line, a cross, a polygon, or a plum blossom, and the protrusion (5) is also shaped like a line, a cross, a polygon, or a plum blossom.
5. A single-unit two-stage screw compressor according to claim 2 or 3, characterized in that: The groove (4) is composed of a plurality of holes, and the boss (5) is composed of a plurality of protrusions that can be inserted into the holes of the groove (4).
6. A single-unit two-stage screw compressor according to claim 1, characterized in that: The first-stage male rotor (22) and the first-stage female rotor (23) are horizontally distributed. The two ends of the shaft of the first-stage male rotor (22) are rotatably mounted on the bearing mounting holes of the first-stage housing (21) and the first-stage bearing seat (24) respectively through bearings. The two ends of the shaft of the first-stage female rotor (23) are rotatably mounted on the bearing mounting holes of the first-stage housing (21) and the first-stage bearing seat (24) respectively through bearings.
7. A single-unit two-stage screw compressor according to claim 5, characterized in that: One end of the first-stage male rotor (22) extends into the motor housing (11) of the motor (1) and serves as the mounting shaft of the motor rotor (12), that is, the motor shaft of the motor (1) and the first-stage male rotor (22) share the same shaft.
8. A single-unit two-stage screw compressor according to claim 1, characterized in that: The motor (1) is a synchronous motor or an asynchronous motor.
9. A single-unit two-stage screw compressor according to claim 1, characterized in that: The second-stage male rotor (32) and the second-stage female rotor (33) are horizontally distributed. The two ends of the second-stage male rotor (32) are rotatably mounted on the bearing mounting holes of the second-stage housing (31) and the second-stage bearing seat (34) respectively through bearings. The two ends of the second-stage female rotor (33) are rotatably mounted on the bearing mounting holes of the second-stage housing (31) and the second-stage bearing seat (34) respectively through bearings.