Internal volume ratio adjusting mechanism of screw compressor

Abstract

The utility model relates to an internal volume ratio adjusting mechanism of a screw compressor, which comprises a sliding block arranged on an exhaust port of a shell of the screw compressor, and a driving component used for driving the end part of the sliding block to slide back and forth on the exhaust section of the exhaust port to adjust the position is arranged between the sliding block and the shell. Therefore, the area of the exhaust section can be changed. According to the internal volume ratio adjusting mechanism of the screw compressor, the geometric shape of the axial exhaust port is changed through movement of the sliding block so that the internal volume ratio can be adjusted in the operation process of the compressor. The device is small in occupied space, low in machining cost, complete in adjusting function and wide in adjusting range. According to different operation conditions of the compressor, the internal volume ratio can be effectively adjusted in the operation process of the compressor so as to ensure that the compressor keeps operating under high energy efficiency.

Description

TECHNICAL FIELD

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

[0002] In the screw compressor, the content volume ratio (Vi for short) refers to the ratio of the volume of the compressor suction and the volume at the end of compression. The content volume ratio is an important parameter in the operation of the compressor, which determines the degree of gas compression. Different application conditions often require different content volume ratios, and appropriate content volume ratios can avoid inefficient operation of the compressor. When the content volume ratio does not match the actual working condition, it may increase the load of the compressor and consume additional compression power. Adjusting the content volume ratio according to different working conditions is the key to improving the energy efficiency of the screw compressor. The content volume ratio is usually adjusted by a slide valve adjusting mechanism, which uses the slide valve to move along the axial direction of the screw to change the position of the radial exhaust port to adjust the content volume ratio to adapt to different operating conditions and optimize the energy efficiency of the compressor under different working conditions.

[0003] Although the slide valve adjusting mechanism improves the energy efficiency of the screw compressor significantly, the existing screw compressor slide valve adjusting mechanism is usually arranged in series with the load adjusting mechanism, as shown in Figure 1 For the series arrangement, the Vi adjusting mode is to use the Vi slide valve to displace along the axial direction of the rotor. When the compressor is in a full load state, the Vi slide valve and the capacity slide valve end face are in close contact. At this time, due to being blocked by the capacity slide valve, the Vi slide valve cannot be further moved in the axial direction, i.e. Vi adjustment cannot be performed, and usually the capacity slide valve needs to be moved to the left side to reduce the load position to the lowest to adjust Vi. This series arrangement occupies a large axial space, and is not suitable for some models of compressors.

[0004] In summary, the above arrangement needs to reduce the load position to the lowest to adjust Vi, and cannot directly adjust Vi when the compressor is in a full load operating state. This arrangement occupies a large space, has high processing cost, and for some compressors, the slide valve adjusting mechanism is not suitable due to the limitation of the structural space. SUMMARY

[0005] In view of the deficiencies of the prior art, the technical problem to be solved by the utility model is to provide a content volume ratio adjusting mechanism of a screw compressor, which uses a slide block to move to change the geometry of the axial exhaust port to realize the adjustment of the content volume ratio during the operation of the compressor.

[0006] In order to solve the above technical problems, the technical scheme of the utility model is: a content volume ratio adjusting mechanism of a screw compressor, which comprises a sliding block arranged on an exhaust port of a shell of the screw compressor, and a driving assembly arranged between the sliding block and the shell and used to drive the end of the sliding block to reciprocatingly slide and adjust the position on the exhaust section of the exhaust port, so as to facilitate the change of the area size of the exhaust section.

[0007] Preferably, the shell is provided with a shell slot, the sliding block is embedded in the shell slot and slides in the shell slot, the front end of the sliding block extends out of the shell slot and is aligned with the circumferential side of the exhaust port, and the rear end of the sliding block is connected with the driving assembly.

[0008] Preferably, the driving assembly is an oil cylinder.

[0009] Preferably, the oil cylinder comprises an oil cylinder body, an oil cylinder end cover, a piston and a piston rod, the oil cylinder body is screwed and locked on the shell and is provided with an O-shaped ring between the oil cylinder body and the shell, the oil cylinder end cover is screwed and locked on the rear end of the oil cylinder body and is provided with an O-shaped ring between the oil cylinder end cover and the oil cylinder body, the piston is located in the oil cylinder body and is provided with an O-shaped ring, a Glorene ring and a wear-resistant ring between the piston and the oil cylinder body, the piston rod is screwed and locked on the piston and is screwed and fastened on the rear end of the sliding block after the piston rod penetrates out of the oil cylinder body, and the piston rod is provided with an O-shaped ring, a Glorene ring and a wear-resistant ring between the piston rod and the oil cylinder body.

[0010] Preferably, a pin shaft limiting assembly is arranged between the shell slot and the sliding block.

[0011] Preferably, a support and alignment assembly is arranged between the shell slot and the sliding block.

[0012] Preferably, the pin shaft limiting assembly comprises a pin body fixedly connected to the front part of the sliding block, a straight slot is formed in the inner slot wall of the shell slot and extends along the sliding direction of the sliding block, and the outer end of the pin body is embedded in the straight slot.

[0013] Preferably, the support and alignment assembly comprises a limiting sleeve located between the vertical gap between the shell slot and the sliding block, one end of the limiting sleeve is connected with a spring, the other end of the limiting sleeve is in surface contact with the sliding block, and the sliding block is surface supported by the limiting sleeve during the sliding process.

[0014] Preferably, a limiting sleeve mounting hole perpendicular to the sliding direction of the sliding block is formed in the inner slot wall of the shell slot, the limiting sleeve is provided with a spring mounting hole and is embedded in the limiting sleeve mounting hole, and the spring is connected between the spring mounting hole and the limiting sleeve mounting hole.

[0015] Preferably, the number of the sliding blocks is two and the sliding blocks are symmetrically distributed on the shells on both sides of the exhaust port.

[0016] Compared with the prior art, the screw compressor has the following beneficial effects: the content volume ratio adjusting mechanism of the screw compressor adopts a sliding block to change the geometric shape of the axial exhaust port to realize the adjustment of the content volume ratio in the operation process of the compressor. The arrangement occupies a small space, has a low processing cost, has complete adjustment functions, and has a wide adjustment range. The content volume ratio can be effectively adjusted in the operation process of the compressor according to different compressor operation conditions, so that the compressor can be kept in operation under high energy efficiency.

[0017] The utility model will be explained further in detail below in combination with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic diagram of the prior art structure.

[0019] Figure 2 It is a schematic diagram of the structure of the embodiment of the utility model.

[0020] Figure 3 It is Figure 2 X-X sectional view of

[0021] Figure 4 It is the oil circuit connection diagram of the oil cylinder of the embodiment of the utility model.

[0022] In the drawing: shell 1, exhaust port 2, sliding block 3, shell slot 4, oil cylinder 5, oil cylinder body 6, oil cylinder end cover 7, piston 8, piston rod 9, O-ring 10, gasket 11, wear-resistant ring 12, pin body 13, straight slot strip 14, limit sleeve 15, spring 16, position sleeve mounting hole 17, spring mounting hole 18, valve 19, oil filling pipeline 20, oil discharge pipeline 21, rotor 22, capacity adjusting rod 23, capacity slide valve 24, Vi slide valve 25, Vi adjusting rod 26. DETAILED DESCRIPTION

[0023] The utility model will be explained further in detail below in combination with the drawings and specific embodiments.

[0024] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0025] It should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form, and in addition, it should be understood that when the terms "comprise" and / or "include" are used in the specification, they indicate the presence of a feature, step, operation, device, component and / or their combination.

[0026] As Figures 2-4 The utility model provides a content volume ratio adjusting mechanism of screw compressor, which is arranged at the exhaust end of the screw compressor and comprises a sliding block 3 arranged on the exhaust port 2 of the housing 1 of the screw compressor, a driving assembly arranged between the sliding block and the housing to drive the end of the sliding block to reciprocally slide and adjust the position on the exhaust section of the exhaust port, so as to change the area of the exhaust section.

[0027] The reciprocating movement of the sliding block changes the geometric shape of the exhaust port. When the sliding block moves towards the exhaust port and blocks part of the original exhaust port, the exhaust port becomes smaller, i.e., the geometric shape area becomes smaller. When the sliding block moves away from the exhaust port, the exhaust port becomes larger, i.e., the geometric shape area becomes larger, and the blocked part is opened. Therefore, the reciprocating movement of the sliding block changes the geometric shape of the exhaust port.

[0028] In the utility model embodiment, the housing is provided with a housing notch 4, the sliding block is embedded in the housing notch and slides, the front end of the sliding block extends out of the housing notch and is aligned with the circumferential side of the exhaust port, and the rear end of the sliding block is connected with the driving assembly.

[0029] In the utility model embodiment, the driving assembly is an oil cylinder 5.

[0030] In the utility model embodiment, the oil cylinder comprises an oil cylinder body 6, an oil cylinder end cover 7, a piston 8 and a piston rod 9. The oil cylinder body is screwed and locked on the housing and is provided with an O-shaped ring 10 between the housing. The oil cylinder end cover is screwed and locked on the rear end of the oil cylinder body and is provided with an O-shaped ring between the oil cylinder body. The piston is located in the oil cylinder body and is provided with an O-shaped ring, a Gley ring 11 and a wear ring 12 between the oil cylinder body. The piston rod is screwed and locked on the piston and is screwed and fastened at the rear end of the sliding block after penetrating out of the oil cylinder body. The piston rod is provided with an O-shaped ring, a Gley ring and a wear ring between the oil cylinder body.

[0031] In the utility model embodiment, a pin shaft limiting assembly is arranged between the housing notch and the sliding block.

[0032] In the utility model embodiment, a supporting and guiding assembly is arranged between the housing notch and the sliding block.

[0033] In the utility model embodiment, the pin shaft limiting assembly comprises a pin body 13 fixedly connected to the front part of the sliding block. A straight groove 14 extending along the sliding direction of the sliding block is formed on the inner groove wall of the housing notch. The outer end of the pin body is embedded in the straight groove.

[0034] In the embodiment of the utility model, the support and alignment assembly comprises a limiting sleeve 15 between the shell notch and the vertical gap of the sliding block, one end of the limiting sleeve is connected with a spring 16, and the other end is in surface contact with the sliding block, so that the sliding block is surface supported by the limiting sleeve during sliding, and the stability is improved.

[0035] In the embodiment of the utility model, a limiting sleeve mounting hole 17 perpendicular to the sliding direction of the sliding block is formed in the inner groove wall of the shell notch, the limiting sleeve is provided with a spring mounting hole 18 and is embedded in the limiting sleeve mounting hole, and the spring is connected between the spring mounting hole and the limiting sleeve mounting hole.

[0036] In the embodiment of the utility model, the number of the sliding blocks is two, and the two sliding blocks are symmetrically arranged on the shell on both sides of the exhaust port.

[0037] In the embodiment of the utility model, the working principle of the content volume ratio adjusting mechanism of the screw compressor is as follows:

[0038] The shell notch is used for accommodating the sliding block and providing the working space required for the movement of the sliding block. The oil cylinder body and the oil cylinder end cover are both provided with oil ports, the injection and discharge of oil are controlled by a valve 19, the oil pressure difference is generated in the compressor by the injection and discharge of oil, the piston is pushed under the action of the oil pressure difference, the movement of the piston drives the sliding block to slide along the shell notch because the piston, the piston rod and the sliding block are connected with each other, the geometric shape of the passage of the exhaust port is determined according to the relative position between the two ends of the two sliding blocks, the compression stroke of the gas in the screw is changed, and then the content volume ratio is changed. When the oil port of the oil cylinder end cover is injected and the oil port of the oil cylinder body is discharged, the sliding block slides along the shell notch in the direction close to the exhaust port, and the content volume ratio increases; when the oil port of the oil cylinder end cover is discharged and the oil port of the oil cylinder body is injected, the sliding block slides along the shell notch in the direction away from the exhaust port, and the content volume ratio decreases. Figure 4 As shown in the figure, the two oil cylinders of the two sliding blocks are connected to the same valve, the injection pipelines 20 of the two oil cylinders are communicated with each other, the discharge pipelines 21 of the two oil cylinders are communicated with each other, and the two sliding blocks are realized to be close to or away from the exhaust port together.

[0039] The upper and lower sides of the sliding block are provided with lubricating grooves, the lubricating oil is injected into the grooves, the lubricating effect is achieved at the sliding side, and the sliding friction of the sliding block is reduced. The limiting sleeve connected with the spring is used for vertically supporting the sliding block, the side surface of the exhaust shell is flush with the side surface of the sliding block, the gap is reduced, and the stability is improved. The pin shaft limiting assembly ensures that the sliding block slides along the designed direction of the shell notch, and the position of the sliding block is limited.

[0040] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application in other forms, and any skilled person in the art can modify or change the above disclosed technical content to equivalent embodiments with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiments without departing from the technical solution of the present application, and in accordance with the technical essence of the present application, still belong to the protection scope of the technical solution of the present application.

Claims

1. A mechanism for adjusting the volume ratio of a screw compressor, characterized by: The application relates to a sliding block arranged on an exhaust port of a housing of a screw compressor, a driving assembly arranged between the sliding block and the housing to drive the end of the sliding block to reciprocally slide and adjust the position on the exhaust section of the exhaust port, so as to change the area size of the exhaust section.

2. The contents ratio adjustment mechanism of a screw compressor according to claim 1, characterized by: The housing is provided with a housing slot, the sliding block is embedded in the housing slot and slides, the front end of the sliding block extends out of the housing slot and is aligned with the circumferential position of the exhaust port, and the rear end of the sliding block is connected with the driving assembly.

3. The clearance ratio adjustment mechanism of a screw compressor according to claim 1 or 2, characterized in that: The driving assembly is an oil cylinder.

4. The clearance ratio adjustment mechanism of a screw compressor according to claim 3, characterized in that: The oil cylinder comprises an oil cylinder body, an oil cylinder end cover, a piston and a piston rod, the oil cylinder body is screwed and locked on the housing and is provided with an O-shaped ring between the oil cylinder body and the housing, the oil cylinder end cover is screwed and locked on the rear end of the oil cylinder body and is provided with an O-shaped ring between the oil cylinder end cover and the oil cylinder body, the piston is located in the oil cylinder body and is provided with an O-shaped ring, a Gley ring and a wear ring between the piston and the oil cylinder body, the piston rod is screwed and locked on the piston and is screwed and fastened on the rear end of the sliding block after penetrating out of the oil cylinder body, and the piston rod is provided with an O-shaped ring, a Gley ring and a wear ring between the piston rod and the oil cylinder body.

5. The clearance ratio adjustment mechanism of a screw compressor according to claim 2, characterized in that: A pin shaft limiting assembly is arranged between the housing slot and the sliding block.

6. The clearance ratio adjustment mechanism of a screw compressor according to claim 2, characterized in that: A supporting and guiding assembly is arranged between the housing slot and the sliding block.

7. The clearance ratio adjustment mechanism of a screw compressor according to claim 5, characterized in that: The pin shaft limiting assembly comprises a pin body fixedly connected to the front part of the sliding block, a straight slot is formed on the inner slot wall of the housing slot and extends along the sliding direction of the sliding block, and the outer end of the pin body is embedded in the straight slot.

8. The clearance ratio adjustment mechanism of a screw compressor according to claim 6, characterized in that: The supporting and guiding assembly comprises a limiting sleeve located between the vertical gap between the housing slot and the sliding block, one end of the limiting sleeve is connected with a spring, and the other end of the limiting sleeve is in surface-to-surface contact with the sliding block, so as to support the sliding block by the limiting sleeve in the surface-to-surface mode during the sliding process.

9. The clearance ratio adjustment mechanism of a screw compressor according to claim 8, characterized in that: The inner slot wall of the housing slot is provided with a limiting sleeve mounting hole perpendicular to the sliding direction of the sliding block, the limiting sleeve is provided with a spring mounting hole and is embedded in the limiting sleeve mounting hole, and the spring is connected between the spring mounting hole and the limiting sleeve mounting hole.

10. The contents ratio adjustment mechanism of a screw compressor according to claim 1, characterized by: The number of the sliding blocks is two and the sliding blocks are symmetrically arranged on the housings on both sides of the exhaust port.

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