Regulating mechanism for internal volume ratio of screw compressor

Abstract

The utility model relates to the technical field of screw compressors, in particular to a screw compressor internal volume ratio adjusting mechanism which comprises an exhaust shell arranged at the exhaust end of a screw compressor, a notch communicated with an exhaust channel is formed in the exhaust shell and located on the side of the exhaust channel, a sliding block is arranged in the notch, and the sliding block is arranged in the exhaust shell. The exhaust shell is provided with an adjusting screw which penetrates into the notch, is in threaded connection with the other end of the sliding block and is used for adjusting the position of the sliding block. The adjusting mechanism is simple and compact in structure and small in occupied space, friction and abrasion of the sliding end face can be effectively reduced, and the size of the exhaust channel is determined through the position of the sliding block.

Description

TECHNICAL FIELD

[0001] The utility model relates to screw compressor technical field especially relates to a screw compressor content volume ratio adjusting mechanism. BACKGROUND

[0002] In the operation process of the screw compressor, adjusting the internal volume ratio of the compressor plays an important role in optimizing system performance, improving energy efficiency and adapting to different working conditions, and the compressor slide valve is a key component to realize this adjusting function.

[0003] The main function of the compressor slide valve is to adjust the internal volume ratio by changing the size of the compression chamber inside the compressor. The compressor slide valve is usually designed as a component that can slide axially along the compressor rotor. When the slide valve moves, the compression stroke of the compressed gas and the size of the exhaust chamber are changed, thereby adjusting the internal volume ratio of the compressor. By precisely controlling the position of the slide valve, the compressor can achieve the best internal volume ratio under different working conditions, achieving the purpose of energy saving and high efficiency operation.

[0004] The existing screw compressor slide valve and its adjusting mechanism are mostly arranged in the axial sliding position. This arrangement method has high cost, high manufacturing difficulty and high precision requirement. Some compressors cannot arrange the slide valve and its adjusting mechanism in the axial direction due to space and structural limitations. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a screw compressor internal volume ratio adjusting mechanism. The adjusting mechanism has a simple and compact structure, occupies a small space, can effectively reduce the friction and wear of the sliding end face, and determines the size of the exhaust passage through the position of the sliding block.

[0006] The technical scheme of the utility model is as follows: a screw compressor internal volume ratio adjusting mechanism, comprising an exhaust casing arranged at the exhaust end of the screw compressor, a slot is arranged on the side of the exhaust passage in the exhaust casing, a sliding block is arranged in the slot, and an adjusting screw is arranged on the exhaust casing and screwed with the other end of the sliding block to adjust the position of the sliding block.

[0007] Further, slots are arranged on both sides of the exhaust passage in the exhaust casing, sliding blocks are arranged in the slots, and adjusting screws are arranged on both sides of the exhaust casing and screwed with the corresponding sliding blocks.

[0008] Further, an elastic support mechanism is arranged in the exhaust casing to make the front end face of the sliding block flush with the mounting end face of the exhaust casing.

[0009] Further, the elastic support mechanism comprises a mounting hole arranged in the exhaust casing, and a spring is arranged in the mounting hole and abuts against the rear end face of the sliding block.

[0010] Further, the exhaust casing is provided with a guide mechanism for sliding the sliding block in a preset direction.

[0011] Further, the guide mechanism comprises a guide slot arranged along the length direction of the slot, and a pin shaft of the sliding block is fixed on the rear end surface of the sliding block and extends into the guide slot.

[0012] Further, the end of the adjusting screw exposed from the exhaust casing is provided with a protection mechanism connected with the exhaust casing.

[0013] Further, the protection mechanism comprises a first protection cover detachably connected with the exhaust casing, the adjusting screw is rotationally connected with the first protection cover and passes through the first protection cover, and a second protection cover is detachably connected with the first protection cover and covers the end of the adjusting screw.

[0014] Further, sealing structures are arranged between the first protection cover and the exhaust casing, between the first protection cover and the adjusting screw, and between the second protection cover and the first protection cover.

[0015] Further, lubricating grooves are arranged on the upper and lower end surfaces of the sliding block.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] The mechanism is arranged at the exhaust end of the screw compressor, has simple and compact structure, occupies small space, has small difficulty in manufacturing, assembling and maintenance, can effectively reduce the friction and abrasion of the sliding end surface, and determines the size of the exhaust passage through the position of the sliding block. According to the operating condition, the proper content volume ratio is selected to ensure that the compressor always operates at the highest energy efficiency, saves energy consumption, improves the adjusting precision, and prolongs the service life. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structural schematic view of the utility model;

[0019] Figure 2 It is a B area enlarged view of the utility model; Figure 1

[0020] Figure 3 It is an A-A sectional view of the utility model; Figure 1

[0021] In the drawing: 10-exhaust casing 10a-exhaust passage 11-slot 12-slot 13-mounting hole 14-spring 15-guide slot 16-pin shaft 21-sliding block 22-sliding block 23-lubricating groove 31-adjusting screw 32-adjusting screw 40-first protection cover 41-first bolt 50-second protection cover 52-second bolt 60-sealing ring.​​ DETAILED DESCRIPTION

[0022] In order to make the above features and advantages of the utility model more apparent, the following specific examples are given, and the utility model is not limited to this.

[0023] Reference Figures 1 to 3

[0024] A screw compressor volume ratio adjusting mechanism, comprising an exhaust casing 10 arranged at the exhaust end of the screw compressor, a notch in communication with the exhaust passage 10a is arranged at the side of the exhaust passage in the exhaust casing 10, a sliding block is arranged in the notch, and an adjusting screw penetrating the notch and screwing with the other end of the sliding block is arranged on the exhaust casing 10 for adjusting the position of the sliding block. The position of the sliding block is adjusted by rotating the adjusting screw to drive the sliding block to slide, the size of the exhaust passage 10a is determined according to the position of the sliding block, the compression stroke of the compressed gas in the rotor is changed, the volume ratio is changed, and the manual adjustment of the volume ratio from small to large is realized.

[0025] In this embodiment, notches 11 and 12 are arranged at both sides of the exhaust passage 10a in the exhaust casing 10, sliding blocks 21 and 22 are arranged in the notches 11 and 12 respectively, and adjusting screws 31 and 32 screwing with the corresponding sliding blocks 21 and 22 are arranged at both sides of the exhaust casing 10.

[0026] In this embodiment, elastic supporting mechanisms are arranged in the exhaust casing 10 to make the front end faces of the sliding blocks 21 and 22 flush with the mounting end face of the exhaust casing 10. Specifically, the elastic supporting mechanisms comprise mounting holes 13 arranged in the exhaust casing 10, springs 14 arranged in the mounting holes 13 and abutting against the rear end faces of the corresponding sliding blocks 21 and 22 through the front end pushing blocks, the sliding blocks 21 and 22 are supported by the springs 14 to keep the front end faces of the sliding blocks 21 and 22 flush with the mounting end face of the exhaust casing 10, and the end face leakage is reduced.

[0027] In this embodiment, guiding mechanisms are arranged in the exhaust casing 10 to make the sliding blocks 21 and 22 slide in the preset directions. Specifically, the guiding mechanisms comprise guiding grooves 15 arranged along the length directions of the notches 11 and 12 respectively, and pin shafts 16 fixed on the rear end faces of the sliding blocks 21 and 22 and extending into the guiding grooves 15. Thus, the sliding blocks 21 and 22 are guaranteed to slide in the preset directions of the notches 11 and 12 through the pin shafts 16, and the limiting effect is achieved.

[0028] In the embodiment, the adjusting screw 31 and the adjusting screw 32 are provided with protection mechanisms connected with the exhaust casing 10 on the end of the exhaust casing. Specifically, the protection mechanism comprises a first protection cover 40 detachably connected with the exhaust casing 10, the adjusting screw 31 and the adjusting screw 32 pass through the corresponding first protection cover 40 and are rotationally connected with the corresponding first protection cover 40, the first protection cover 40 is detachably connected with a second protection cover 50 covering the end of the adjusting screw 31 and the adjusting screw 32, the second protection cover 50 is provided with a cavity for the end of the corresponding adjusting screw 31 and the adjusting screw 32, and the cavity can be an internal hexagonal structure.

[0029] In the embodiment, the first protection cover 40 is connected with the exhaust casing 10 through a first bolt 41, and the second protection cover 50 is connected with the first protection cover 40 through a second bolt 51, so that the first protection cover and the second protection cover are detachably connected.

[0030] In the embodiment, a sealing structure is arranged between the first protection cover 40 and the exhaust casing 10, between the first protection cover 40 and the adjusting screw, and between the second protection cover 50 and the first protection cover 40. The sealing structure can be a sealing ring 60 arranged between the first protection cover 40 and the exhaust casing 10, between the first protection cover 40 and the adjusting screw 31 or the adjusting screw 32, and between the second protection cover 50 and the first protection cover 40.

[0031] In the embodiment, the upper and lower end faces of the sliding block 21 and the sliding block 22 are provided with lubricating grooves 23, lubricating oil is injected into the lubricating grooves, and the sliding block 21 and the sliding block 22 are lubricated at the sliding end face to reduce the frictional resistance of the sliding block 21 and the sliding block 22.

[0032] During adjustment, the second bolt 51 on the second protection cover 50 is loosened by using an internal hexagonal wrench, the second protection cover 50 is removed, an external hexagonal wrench is used to rotate the corresponding adjusting screw 31 and the adjusting screw 32, the number of turns of the adjusting screw 31 and the adjusting screw 32 is adjusted according to the operating condition, the sliding block 21 and the sliding block 22 are adjusted to the predetermined position, the best content ratio of the operating condition is achieved, and the high-efficiency operation of the screw compressor is realized. After adjustment, the second protection cover 50 is locked and fixed by the second bolt 51 to protect the stability of the adjusting structure.

[0033] In the above-mentioned utility model, the words "first", "second", etc. are used to limit the parts. Those skilled in the art should know that the use of "first" and "second" is only for the convenience of distinguishing the parts. Unless otherwise stated, the above words do not have special meanings.

[0034] If the utility model discloses or involves mutually fixed connecting parts or structural members, then, except for another declaration, fixed connection can be understood as: detachably fixed connection (for example, using bolt or screw connection), and also can be understood as: non-detachable fixed connection (for example, riveting, welding), of course, mutual fixed connection can also be replaced by integral structure (for example, integrally formed by using casting process) (except for obviously unable to use integral forming process).

[0035] In addition, the terms used for indicating the position relationship or shape in any of the technical solutions disclosed by the utility model above include the states or shapes similar, analogous or close to them, except for another declaration.

[0036] Any component provided by the utility model can be assembled from multiple individual components, or can be an individual component manufactured by integral forming process.

[0037] The above only describes the preferred embodiments of the utility model, and any change and modification made within the scope of the utility model patent application should be included in the scope of the utility model.

Claims

1. A screw compressor internal volume ratio adjustment mechanism comprising an exhaust housing provided at an exhaust end portion of a screw compressor, characterized by, The side of the exhaust casing where the exhaust passage is located is provided with a slot connected with the exhaust passage, and the slot is provided with a sliding block.

2. A positive displacement screw compressor internal volume ratio adjustment mechanism according to claim 1 wherein, The two sides of the exhaust casing where the exhaust passage is located are provided with slots, and the slots are provided with sliding blocks.

3. A contents volume ratio adjustment mechanism for a screw compressor according to claim 1 or 2, characterized in that The exhaust casing is provided with an elastic supporting mechanism which makes the front end surface of the sliding block flush with the mounting end surface of the exhaust casing.

4. A positive displacement screw compressor internal volume ratio adjustment mechanism according to claim 3, wherein, The elastic supporting mechanism includes a mounting hole provided in the exhaust casing, and the mounting hole is provided with a spring which abuts against the rear end surface of the sliding block.

5. A contents volume ratio adjustment mechanism for a screw compressor according to claim 1, 2 or 4, wherein The exhaust casing is provided with a guiding mechanism which makes the sliding block slide along a preset direction.

6. A positive displacement screw compressor internal volume ratio adjustment mechanism according to claim 5, wherein, The guiding mechanism includes a guiding slot provided along the length direction of the slot, and the rear end surface of the sliding block is fixed with a pin shaft which extends into the guiding slot.

7. A contents volume ratio adjustment mechanism for a screw compressor according to claim 1 or 6, characterized in that The end of the adjusting screw which is exposed from the exhaust casing is provided with a protection mechanism connected with the exhaust casing.

8. A contents volume ratio adjustment mechanism for a screw compressor according to claim 7, wherein The protection mechanism includes a first protection cover which is detachably connected with the exhaust casing, the adjusting screw is rotatably connected with the first protection cover and extends through the first protection cover, and the first protection cover is detachably connected with a second protection cover which covers the end of the adjusting screw.

9. A contents volume ratio adjustment mechanism for a screw compressor as defined in claim 8, wherein Sealing structures are provided between the first protection cover and the exhaust casing, between the first protection cover and the adjusting screw, and between the second protection cover and the first protection cover.

10. A positive displacement screw compressor internal volume ratio adjustment mechanism as claimed in claim 1, wherein, The upper and lower end surfaces of the sliding block are provided with lubricating grooves.

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