Independent internal volume ratio adjusting mechanism applied to screw compressor

Abstract

The internal volume ratio independent adjusting mechanism comprises an exhaust shell of the compressor, Vi plungers are embedded in the left side and the right side of an exhaust port of the exhaust shell, the axes of the Vi plungers are perpendicular to the exhaust end face of the exhaust port, and the two Vi plungers are controlled by an oil way to be synchronously moved and adjusted. Axial Vi adjustment is achieved by the fact that the axis of the Vi plunger is perpendicular to the exhaust end face of the exhaust port, the phenomenon of jamming caused by radial force is avoided, the structure is simple and compact, the space occupancy rate is low, and the difficulty in manufacturing, assembling and maintaining is small. Dynamic adjustment can be achieved according to changes such as flow requirements and pressure fluctuation in the full-load operation state of the compressor. Compared with a conventional Vi slide valve mechanism, the mechanism achieves independent adjustment, does not need assistance of other mechanisms, and meets the requirements that operation conditions need to be frequently changed and the like.

Description

TECHNICAL FIELD

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

[0002] In the operation process of screw compressor, the compressor slide valve (hereinafter referred to as Vi slide valve) as the key component, its main function is to adjust the content volume ratio (referred to as Vi), by changing the size of the exhaust port of the compressor, adjusting the exhaust state of the compressor, so as to realize the adjustment of the content volume ratio of the compressor, make the compressor reach the best operating state under different working conditions, if the compressor is in overcompression or undercompression state, it will cause the efficiency to reduce.The adjustment mode of the existing screw compressor slide valve is mostly radial adjustment, the structure of the radial Vi slide valve is relatively complex, so that its design, manufacture and assembly are difficult, and it has high requirements on the matching precision of each part, which also increases the manufacturing cost and processing difficulty.In addition, due to the harsh operation condition and high operation pressure of the screw compressor, if the traditional slider mechanism is used for adjustment, the slider is easy to be affected by the radial force, and the excessive radial force is easy to cause the slow movement of the slider, even the phenomenon of "stuck", which affects the normal operation of the system, if the traditional arrangement mode is used, the problems of adjustment difficulty, high cost and complex structure will be encountered.

[0003] In order to solve the above technical problems, the content volume ratio independent adjusting mechanism applied to screw compressor is provided. UTILITY MODEL CONTENT

[0004] 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 independent adjusting mechanism applied to screw compressor, which realizes axial Vi adjustment by the perpendicularity between the axis of Vi plunger and the exhaust end face of exhaust port, avoids the phenomenon of "stuck" caused by radial force, and has simple and compact structure and low space occupancy.

[0005] In order to solve the above technical problems, the technical scheme of the utility model is as follows: a content volume ratio independent adjusting mechanism applied to screw compressor, comprising the exhaust casing of the compressor, Vi plungers are embedded on the left and right sides of the exhaust port of the exhaust casing, the axes of the Vi plungers are perpendicular to the exhaust end face of the exhaust port, and the two Vi plungers are synchronously moved and adjusted through oil control.

[0006] Preferably, the exhaust casing is provided with a mounting chamber for mounting the Vi plunger, one end of the mounting chamber leads to the exhaust end face of the high-pressure area, and the other end is blocked from the low-pressure area of the suction side through the plunger cover plate.

[0007] Preferably, the end face of the stepped shaft of the Vi plunger towards the low pressure area and the plunger cover plate form a first oil cavity, and the end face of the stepped shaft of the Vi plunger towards the high pressure area and the stepped surface of the installation cavity form a second oil cavity.

[0008] Preferably, the first oil cavity is connected with a first oil port, the second oil cavity is connected with a second oil port, the oil path of the first oil port is connected to the oil inlet end of a hydraulic valve, and the oil outlet end of the hydraulic valve is connected to the second oil port of the low pressure area on the suction side through an oil path.

[0009] Preferably, a first sealing assembly is arranged between the high pressure area and the second oil cavity, a second sealing assembly is arranged between the second oil cavity and the first oil cavity, and a third sealing assembly is arranged between the first oil cavity and the low pressure area.

[0010] Preferably, the first and second sealing assemblies are arranged between the outer circumferential part of the Vi plunger and the inner circumferential part of the installation cavity, and the third sealing assembly is arranged between the outer circumferential part of the plunger cover plate and the inner circumferential part of the installation cavity.

[0011] Preferably, the first sealing assembly is composed of a first T-shaped gasket and a first O-shaped ring, wherein the first O-shaped ring is sleeved on the inner ring of the sealing groove of the Vi plunger, and the first T-shaped gasket is sleeved on the outer ring of the sealing groove of the Vi plunger.

[0012] Preferably, the second sealing assembly is composed of a second T-shaped gasket and a second O-shaped ring, wherein the second O-shaped ring is sleeved on the inner ring of the sealing groove of the Vi plunger, and the second T-shaped gasket is sleeved on the outer ring of the sealing groove of the Vi plunger.

[0013] Preferably, the third sealing assembly is a third O-shaped ring, which is sleeved on the sealing groove of the plunger cover plate.

[0014] Preferably, the plunger end part on the exhaust end face of the Vi plunger is used to move to fill the exhaust end face or expand the exhaust end face.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. Axial Vi adjustment is realized by the perpendicularity of the axis of the Vi plunger and the exhaust end face of the exhaust port, the phenomenon of being "stuck" by radial force is avoided, the structure is simple and compact, the space occupancy is low, and the difficulty in manufacturing, assembling and maintaining is smaller.

[0017] 2. Dynamic adjustment can be realized according to changes such as flow demand and pressure fluctuation under the full load operation state of the compressor.

[0018] 3. Compared with the conventional Vi slide valve mechanism, the mechanism realizes independent adjustment without the aid of other mechanisms, and meets the needs of frequent changes of operating conditions.

[0019] The utility model will be explained in further detail below in combination with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the main view constructional diagram of single Vi plunger in the utility model embodiment.

[0021] Figure 2 It is the side view distribution diagram of two Vi plungers on the exhaust end face of exhaust port.

[0022] In the drawing: exhaust casing 1, exhaust port 2, Vi plunger 3, exhaust end face 4, plunger cover plate 5, first oil cavity 6, second oil cavity 7, first oil port 8, second oil port 9, hydraulic valve 10, first T-shaped gainer 11, first O-shaped ring 12, second T-shaped gainer 13, second O-shaped ring 14, third O-shaped ring 15. DETAILED DESCRIPTION

[0023] The utility model will be explained in further 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, there is a feature, step, operation, device, component and / or combination thereof.

[0026] As shown in Figures 1-2 The embodiment provides a content volume ratio independent adjusting mechanism applied to a screw compressor, which comprises an exhaust casing 1 of the compressor, Vi plungers 3 are embedded on the left and right sides of an exhaust port 2 of the exhaust casing, the axis of the Vi plunger is perpendicular to an exhaust end face 4 of the exhaust port, and the two Vi plungers are synchronously moved and adjusted through oil way control.

[0027] The size of the exhaust end face of the exhaust port is changed through the axial movement of the Vi plunger, so that the adjustment of the content volume ratio of the compressor is realized; the reliability is high, the structure is simple, and the space is saved; the Vi can also be adjusted under the full load operation state of the compressor.

[0028] In the embodiment of the utility model, the installation chamber is provided on the exhaust casing, and is used to install the Vi plunger, one end of the installation chamber is connected with the exhaust end surface of the high pressure area, and the other end is blocked from the low pressure area of the suction side through the plunger cover plate 5.

[0029] In the embodiment of the utility model, the first oil cavity 6 is formed between the end surface of the stepped shaft of the Vi plunger towards the low pressure area and the plunger cover plate, and the second oil cavity 7 is formed between the end surface of the stepped shaft of the Vi plunger towards the high pressure area and the stepped surface of the installation chamber.

[0030] In the embodiment of the utility model, the first oil cavity is connected with the first oil port 8, the second oil cavity is arranged with the second oil port 9 to communicate with the low pressure area, the oil path of the first oil port is connected to the oil inlet end of the hydraulic valve 10, and the oil outlet end of the hydraulic valve is connected to the second oil port of the low pressure area of the suction side through the oil path. The oil inlet and outlet states of the first oil port are controlled by the hydraulic valve.

[0031] In the embodiment of the utility model, the first sealing assembly is arranged between the high pressure area and the second oil cavity, the second sealing assembly is arranged between the second oil cavity and the first oil cavity, and the third sealing assembly is arranged between the first oil cavity and the low pressure area.

[0032] In the embodiment of the utility model, the first and second sealing assemblies are arranged between the outer circumferential part of the Vi plunger and the inner circumferential part of the installation chamber, and the third sealing assembly is arranged between the outer circumferential part of the plunger cover plate and the inner circumferential part of the installation chamber.

[0033] In the embodiment of the utility model, the first sealing assembly is composed of a first T-shaped gasket 11 and a first O-shaped ring 12, wherein the first O-shaped ring is sleeved on the inner ring of the sealing groove of the Vi plunger, and the first T-shaped gasket is sleeved on the outer ring of the sealing groove of the Vi plunger. The first T-shaped gasket undertakes the main sealing task, and the first O-shaped ring plays an auxiliary sealing role.

[0034] In the embodiment of the utility model, the second sealing assembly is composed of a second T-shaped gasket 13 and a second O-shaped ring 14, wherein the second O-shaped ring is sleeved on the inner ring of the sealing groove of the Vi plunger, and the second T-shaped gasket is sleeved on the outer ring of the sealing groove of the Vi plunger. The second T-shaped gasket undertakes the main sealing task, and the second O-shaped ring plays an auxiliary sealing role.

[0035] In the embodiment of the utility model, the third sealing assembly is a third O-shaped ring 15, and the third O-shaped ring is sleeved on the sealing groove of the outer circumferential part of the plunger cover plate.

[0036] In the embodiment of the utility model, the plunger end part of the Vi plunger on the exhaust end surface is used to move to fill up the exhaust end surface or expand the exhaust end surface.

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

[0038] The injection of high-pressure oil in the first oil cavity or the oil discharge to the second oil port in the low-pressure area is accurately controlled through the hydraulic valve switch action.

[0039] When high-pressure oil is injected into the first oil cavity, the Vi plunger is pushed to move left (to the high-pressure area), and when the Vi plunger moves to the leftmost position, the exhaust end surface is filled (i.e., the joint part between the installation cavity and the exhaust end surface is filled by the plunger), at this time, the exhaust end surface area is minimum, i.e., the exhaust port is minimum (as shown in Figure 1 ).

[0040] When the first oil port is controlled to be communicated with the system suction side (low pressure) through the hydraulic valve, since the left side of the Vi plunger is connected with the high-pressure exhaust end, a pressure difference is formed to push the Vi plunger to the right (to the low-pressure area), the exhaust end surface of the exhaust port is expanded to the maximum (i.e., the joint part between the installation cavity and the exhaust end surface is left empty), and the oil in the first oil cavity flows back to the second oil port.

[0041] The high-pressure oil here is provided by the pressure difference of the compressor itself, and when the pressure difference is not enough, an oil pump can be added to the oil supply path to increase the oil injection pressure.

[0042] The above is only a preferred embodiment of the utility model, and is not intended to limit the utility model in other forms. Any skilled person in the art can modify or change the above disclosed technical content to obtain equivalent embodiments. However, any simple modification, equivalent change and modification of the above embodiments based on the technical essence of the utility model still fall within the protection scope of the utility model technical scheme.

Claims

1. A mechanism for independent adjustment of the volume ratio of a screw compressor, characterized in that: The exhaust casing of the compressor is provided with Vi plunger on both sides of the exhaust port, the axis of the Vi plunger is perpendicular to the exhaust end face of the exhaust port, and the two Vi plungers are synchronously moved and adjusted through oil control.

2. The clearance ratio independent adjustment mechanism for a screw compressor according to claim 1, characterized in that: The exhaust casing is provided with a mounting chamber for mounting the Vi plunger, one end of the mounting chamber is connected to the exhaust end face of the high pressure area, and the other end is blocked by the plunger cover plate from the low pressure area of the suction side.

3. The volume ratio independent adjustment mechanism for a screw compressor according to claim 2, characterized in that: The first oil cavity is formed between the end face of the stepped shaft of the Vi plunger towards the low pressure area and the plunger cover plate, and the second oil cavity is formed between the end face of the stepped shaft of the Vi plunger towards the high pressure area and the stepped surface of the mounting chamber.

4. The volume ratio independent adjustment mechanism for a screw compressor according to claim 3, characterized in that: The first oil cavity is connected to the first oil port, the second oil cavity is connected to the second oil port, the oil path of the first oil port is connected to the oil inlet end of the hydraulic valve, and the oil outlet end of the hydraulic valve is connected to the second oil port of the low pressure area of the suction side through the oil path.

5. The clearance ratio independent adjustment mechanism for a screw compressor according to claim 3, characterized in that: The first sealing assembly is arranged between the high pressure area and the second oil cavity, the second sealing assembly is arranged between the second oil cavity and the first oil cavity, and the third sealing assembly is arranged between the first oil cavity and the low pressure area.

6. The volume ratio independent adjustment mechanism for a screw compressor according to claim 5, characterized in that: The first and second sealing assemblies are arranged between the outer peripheral part of the Vi plunger and the inner peripheral part of the mounting chamber, and the third sealing assembly is arranged between the outer peripheral part of the plunger cover plate and the inner peripheral part of the mounting chamber.

7. The volume ratio independent adjustment mechanism for a screw compressor according to claim 6, characterized in that: The first sealing assembly is composed of a first T-shaped gasket and a first O-shaped ring, wherein the first O-shaped ring is sleeved on the inner ring of the sealing groove of the Vi plunger, and the first T-shaped gasket is sleeved on the outer ring of the sealing groove of the Vi plunger.

8. The volume ratio independent adjustment mechanism for a screw compressor according to claim 6, characterized in that: The second sealing assembly is composed of a second T-shaped gasket and a second O-shaped ring, wherein the second O-shaped ring is sleeved on the inner ring of the sealing groove of the Vi plunger, and the second T-shaped gasket is sleeved on the outer ring of the sealing groove of the Vi plunger.

9. The volume ratio independent adjustment mechanism for a screw compressor according to claim 6, characterized in that: The third sealing assembly is a third O-shaped ring, which is sleeved on the sealing groove of the plunger cover plate.

10. The clearance ratio independent adjustment mechanism for a screw compressor according to claim 1, characterized in that: The plunger end of the Vi plunger on the exhaust end face is used to move to fill the exhaust end face or expand the exhaust end face.

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