Axial force unloading structure of a compressor test equipment

Abstract

The present invention belongs to the technical field of gas turbines, and particularly relates to an axial force unloading structure of a compressor test device, which includes a main rotating shaft, a balance disc, a core shaft pull rod and a pull rod nut; the main rotating shaft is rotationally connected to the device main body of the compressor test device through bearings; torque can be transmitted between the main rotating shaft and the rear journal; the balance disc is in sealed cooperation with the device main body and is fixedly connected to the main rotating shaft at the inner edge. Cavities are provided on both the front and rear sides of the balance disc, and the pressure difference between the two cavities provides a backward balancing force for the balance disc; the balance disc is fixedly connected to the main rotating shaft, and the core shaft pull rod is used for transmitting the balancing force between the main rotating shaft and the rear journal, so that the balancing force can offset the forward axial force of the compressor rotor. Since this solution can independently transmit the balancing force and torque, it is convenient to design the structural strength of each component according to actual needs; it reduces the design difficulty of the compressor test device and improves the reliability of the overall structure of the test device.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas turbines, and particularly relates to an axial force unloading structure for a compressor test device. Background Art

[0002] When an axial flow gas turbine is in operation, both the compressor rotor and the turbine rotor will generate large axial forces. Since the turbine rotor and the corresponding compressor rotor are coaxial, the axial force directions of the two are opposite and cancel each other out, thus ensuring the safe operation of the whole machine.

[0003] However, in the test scenario, the compressor rotor is often tested alone, and a large axial force is often generated when the compressor rotor rotates. Therefore, this solution designs an axial force unloading structure for a compressor test device to unload the axial force of the compressor rotor. Summary of the Invention

[0004] In order to solve the above problems existing in the prior art, this solution provides an axial force unloading structure for a compressor test device.

[0005] The technical solution adopted by the present invention is as follows:

[0006] An axial force unloading structure for a compressor test device, comprising a main rotating shaft, a balance disk, a core shaft tie rod and a tie rod nut;

[0007] The rear end of the compressor rotor of the gas turbine is fixedly connected with a rear journal;

[0008] The main rotating shaft is rotationally connected to the device main body of the compressor test device through bearings and is driven by a motor; the main rotating shaft and the rear journal can perform torque transmission to drive the compressor rotor;

[0009] The balance disk is in sealed cooperation with the device main body, and the inner edge is fixedly connected with the main rotating shaft. Cavities are provided on both the front and rear sides of the balance disk, and the pressure difference between the two cavities provides a backward balancing force for the balance disk; the balance disk is fixedly connected to the main rotating shaft, and the core shaft tie rod is used for the balancing force transmission between the main rotating shaft and the rear journal, so that the balancing force can offset the forward axial force of the compressor rotor.

[0010] As an alternative or supplement to the above axial force unloading structure: a fixed distance sleeve is provided between the rear journal and the main rotating shaft; the fixed distance sleeve is sleeved outside the core shaft tie rod, the front end of the fixed distance sleeve abuts against the rear end of the rear journal, and the rear end of the fixed distance sleeve abuts against the front end of the main rotating shaft.

[0011] As an alternative or supplement to the above axial force unloading structure: the core shaft tie rod is arranged inside the main rotating shaft, the front end of the core shaft tie rod is threadedly connected to the rear journal, the rear end of the core shaft tie rod is threadedly connected to the tie rod nut, and the tie rod nut abuts against the rear end of the main rotating shaft.

[0012] As an alternative or supplement to the above axial force unloading structure: the front end of the mandrel pull rod has a first external thread, and the rear end of the rear journal has a first internal thread, and the first external thread and the first internal thread are in threaded engagement with each other.

[0013] As an alternative or supplement to the above axial force unloading structure: the rear end of the mandrel pull rod has a second external thread, and the second external thread is in threaded engagement with the pull rod nut; the rear end of the main rotating shaft has a rear end face perpendicular to its axial direction, and the end face of the pull rod nut abuts against the rear end face of the main rotating shaft.

[0014] As an alternative or supplement to the above axial force unloading structure: the cavity provided on the front side of the balance disk is a high-pressure cavity, and the cavity provided on the rear side is a low-pressure cavity, and the air pressure in the high-pressure cavity is higher than the air pressure in the low-pressure cavity.

[0015] As an alternative or supplement to the above axial force unloading structure: torque is transmitted between the main rotating shaft and the rear journal through an intermediate connecting sleeve and a torque transmission shaft. The front end of the torque transmission shaft is key-connected to the rear journal, the rear end is key-connected to the intermediate connecting sleeve, and the rear end of the intermediate connecting sleeve is key-connected to the front end of the main rotating shaft.

[0016] As an alternative or supplement to the above axial force unloading structure: the bearing includes a first bearing and a second bearing. Both the first bearing and the second bearing are sleeved outside the main rotating shaft. The first bearing is located at the rear end of the main rotating shaft, and the first bearing is located at the front end of the main rotating shaft.

[0017] The beneficial effects of the present invention are as follows: in this solution, a pull rod nut is used to transmit the axial force, and a main rotating shaft is used to transmit the torque, which can make the transmission of the balance force and the transmission of the torque independent of each other, facilitating the design of the structural strength of each component according to actual needs, so that the connection parts between the components do not need to be designed with complex structures to simultaneously meet the synchronous transmission of torque and axial force; reducing the design difficulty of the compressor test equipment and improving the reliability of the overall structure of the test equipment. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present solution or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art.

[0019] Figure 1 It is a connection state diagram of the axial force unloading structure and the compressor rotor;

[0020] Figure 2 It is a detailed structure diagram of the axial force unloading structure.

[0021] In the figure: 1-axial force unloading structure; 2-compressor rotor; 3-main rotating shaft; 4-first bearing; 5-balance plate; 6-core shaft tie rod; 7-second bearing; 8-spacer sleeve; 9-torque transmission shaft; 10-rear journal; 11-tie rod nut; 12-middle connecting sleeve. DETAILED DESCRIPTION

[0022] The technical solution in this embodiment will be clearly and completely described below in conjunction with the accompanying drawings. The described embodiments are only some of the embodiments, not all of them. Based on the embodiments in this solution, all other embodiments obtained by ordinary technicians in this field without making creative work are within the protection scope of this solution.

[0023] like Figures 1 to 2 As shown, this embodiment designs an axial force unloading structure 1 of a compressor test equipment, including a main rotating shaft 3, a balancing plate 5, a core shaft tie rod 6, a distance sleeve 8, a torque transmission shaft 9, a tie rod nut 11 and an intermediate connecting sleeve 12 and other components.

[0024] The rear end of the gas turbine compressor rotor 2 is fixedly connected to the rear journal 10; the compressor rotor 2 is the component involved in the compressor test, and the compressor rotor 2 can be a high-pressure compressor rotor 2 or a low-pressure compressor rotor 2. When the compressor rotor 2 rotates, the compressor rotor 2 directs the airflow to the rear (i.e. Figure 1 The compressor rotor 2 is compressed in the left direction in the middle of the air compressor. At this time, under the influence of the reaction force, the compressor rotor 2 generates a forward (i.e. Figure 1 The axial force unloading structure 1 in this embodiment is designed to unload, offset or balance the axial force generated by the compressor rotor 2 during rotation.

[0025] The main rotating shaft 3 is in a tubular shape, and a keyway is provided on the outer side of the front end of the main rotating shaft 3. The rear end of the main rotating shaft 3 has a connecting plate, so that the main rotating shaft 3 can be connected to the motor of the compressor test equipment by transmission. The main rotating shaft 3 is connected to the main body of the compressor test equipment by bearings, and is driven by the motor to drive the compressor rotor 2.

[0026] The balance disk 5 is in sealed cooperation with the equipment main body. The inner edge of the balance disk 5 is fixed by means of key connection, threaded connection, welding, etc., so as to realize the fixed connection between the inner edge of the balance disk 5 and the main rotating shaft 3. Cavities are provided on both the front and rear sides of the balance disk 5. The cavity provided on the front side of the balance disk 5 is a high-pressure cavity, and the cavity provided on the rear side is a low-pressure cavity. The air pressure in the high-pressure cavity is higher than that in the low-pressure cavity; the air pressure in the high-pressure cavity can be equal to or greater than the atmospheric pressure, and the air pressure in the low-pressure cavity can be less than or equal to the atmospheric pressure. The pressure difference between the high-pressure cavity and the low-pressure cavity provides a backward balancing force for the balance disk 5, and this balancing force can be used to balance the axial force generated when the compressor rotor 2 rotates, thereby reducing the axial force borne by the bearing and reducing the risk of bearing damage. The outer edge of the balance disk 5 can be provided with labyrinth teeth to facilitate cooperation with the labyrinth ring to realize the separation between the high-pressure cavity and the low-pressure cavity.

[0027] The core shaft pull rod 6 is used for the transmission of the balancing force between the main rotating shaft 3 and the rear journal 10, so that the balancing force can offset the forward axial force of the compressor rotor 2. Specifically: the core shaft pull rod 6 is arranged inside the main rotating shaft 3. The front end of the core shaft pull rod 6 is threadedly connected to the rear journal 10, and the rear end of the core shaft pull rod 6 is threadedly connected to the pull rod nut 11. The pull rod nut 11 abuts against the rear end of the main rotating shaft 3; the rear end of the main rotating shaft 3 has a rear end face perpendicular to its axial direction, and the end face of the pull rod nut 11 abuts against the rear end face of the main rotating shaft 3. During the test: the balancing force at the upper end of the balance disk 5 is transmitted to the main rotating shaft 3, the balancing force is transmitted to the core shaft pull rod 6 through the pull rod nut 11, and then transmitted to the compressor rotor 2, so as to unload, offset or balance the axial force generated when the compressor rotor 2 rotates.

[0028] At the rear end of the core shaft pull rod 6, there is a second external thread, which is in threaded cooperation with the pull rod nut 11.

[0029] A spacing sleeve 8 is arranged between the rear journal 10 and the main rotating shaft 3; the spacing sleeve 8 is sleeved outside the core shaft pull rod 6. The front end of the spacing sleeve 8 abuts against the rear end of the rear journal 10, and the rear end of the spacing sleeve 8 abuts against the front end of the main rotating shaft 3.

[0030] The front end of the core shaft pull rod 6 has a first external thread, and the rear end of the rear journal 10 has a first internal thread, and the first external thread and the first internal thread are in threaded cooperation with each other.

[0031] Torque is transmitted between the main rotating shaft 3 and the rear journal 10 through an intermediate connecting sleeve 12 and a torque transmitting shaft 9 to drive the compressor rotor 2. The front end of the torque transmitting shaft 9 is key-connected to the rear journal 10, and the rear end is key-connected to the intermediate connecting sleeve 12. The rear end of the intermediate connecting sleeve 12 is key-connected to the front end of the main rotating shaft 3. Components such as the main rotating shaft 3, the rear journal 10, the intermediate connecting sleeve 12, and the torque transmitting shaft 9 are connected to each other by key connection, thereby enhancing their torque transmission ability and weakening the axial force transmission ability, thus ensuring the upper limit of torque transmission. At the same time, due to the detachable nature of components such as the intermediate connecting sleeve 12 and the torque transmitting shaft 9, the intermediate connecting sleeve 12 and the torque transmitting shaft 9 can be disassembled and replaced according to different models of the compressor rotor 2, thereby improving the compatibility of the compressor test equipment in this embodiment with the compressor rotor 2.

[0032] The bearings include a first bearing 4 and a second bearing 7. Both the first bearing 4 and the second bearing 7 are sleeved outside the main rotating shaft 3. The first bearing 4 is located at the rear end of the main rotating shaft 3, and the first bearing 4 is located at the front end of the main rotating shaft 3. The first bearing 4 and the second bearing 7 are respectively arranged at the front and rear ends of the main rotating shaft 3 to stably support the main rotating shaft 3 and improve the stability of the main rotating shaft 3 during rotation.

[0033] In this embodiment, since a tie rod nut 11 is used to transmit the axial force and the main rotating shaft 3 is used to transmit the torque, the balance force and the torque can be independently transmitted, which is convenient for designing the structural strength of each component according to actual needs; reducing the design difficulty of the compressor test equipment and improving the reliability of the overall structure of the test equipment.

[0034] The above embodiments are merely examples for clear illustration and not limitations on the implementation manners; it is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of this technology.

Claims

1. An axial force unloading structure of a compressor test equipment, characterized in that: It comprises a main rotating shaft (3), a balancing plate (5), a core shaft pull rod (6) and a pull rod nut (11); A rear journal (10) is fixedly connected to the rear end of the compressor rotor (2) of the gas turbine; The main rotating shaft (3) is rotatably connected to the equipment body of the compressor test equipment through a bearing and is driven by a motor; the main rotating shaft (3) and the rear journal (10) are capable of transmitting torque to drive the compressor rotor (2); The balancing disc (5) is sealed with the main body of the equipment, and the inner edge is fixedly connected to the main rotating shaft (3). The front and rear sides of the balancing disc (5) are both provided with cavities, and the pressure difference between the two cavities provides a backward balancing force for the balancing disc (5); the balancing disc (5) is fixedly connected to the main rotating shaft (3), and the core shaft tie rod (6) is used to transmit the balancing force between the main rotating shaft (3) and the rear journal (10), so that the balancing force can offset the forward axial force of the compressor rotor (2); A distance sleeve (8) is provided between the rear journal (10) and the main rotating shaft (3); the distance sleeve (8) is sleeved outside the core shaft tie rod (6), the front end of the distance sleeve (8) abuts against the rear end of the rear journal (10), and the rear end of the distance sleeve (8) abuts against the front end of the main rotating shaft (3); Torque is transmitted between the main rotating shaft (3) and the rear journal (10) via an intermediate connecting sleeve (12) and a torque transmission shaft (9); the front end of the torque transmission shaft (9) is key-connected to the rear journal (10), and the rear end is key-connected to the intermediate connecting sleeve (12); the rear end of the intermediate connecting sleeve (12) is key-connected to the front end of the main rotating shaft (3); The bearing comprises a first bearing (4) and a second bearing (7), wherein the first bearing (4) and the second bearing (7) are both sleeved outside the main rotating shaft (3), the first bearing (4) being located at the rear end of the main rotating shaft (3), and the second bearing (7) being located at the front end of the main rotating shaft (3); The mandrel pull rod (6) is arranged in the main rotating shaft (3), the front end of the mandrel pull rod (6) is threadedly connected to the rear journal (10), the rear end of the mandrel pull rod (6) is threadedly connected to the pull rod nut (11), and the pull rod nut (11) abuts against the rear end of the main rotating shaft (3).

2. The axial force unloading structure of the compressor test equipment according to claim 1 is characterized in that: The front end of the core shaft pull rod (6) has a first external thread, and the rear end of the rear journal (10) has a first internal thread, and the first external thread and the first internal thread are threadably matched with each other.

3. The axial force unloading structure of the compressor test equipment according to claim 1, characterized in that: The rear end of the core shaft tie rod (6) is provided with a second external thread, which is threadably matched with the tie rod nut (11); the rear end of the main rotating shaft (3) is provided with a rear end face perpendicular to its axial direction, and the end face of the tie rod nut (11) is abutted against the rear end face of the main rotating shaft (3).

4. The axial force unloading structure of the compressor test equipment according to claim 1, characterized in that: The cavity arranged at the front side of the balancing disk (5) is a high-pressure cavity, and the cavity arranged at the rear side is a low-pressure cavity. The air pressure in the high-pressure cavity is higher than the air pressure in the low-pressure cavity.

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