CN214577609U

CN214577609U - Unloading structure of compressor

Info

Publication number: CN214577609U
Application number: CN202120303090.7U
Authority: CN
Inventors: 王跃飞; 李德华; 赵彬涵; 金朝阳; 黄永胜; 邬晓霞; 蒲敏
Original assignee: Chongqing Gas Compressor Factory Co Ltd
Current assignee: Chongqing Gas Compressor Factory Co Ltd
Priority date: 2021-02-03
Filing date: 2021-02-03
Publication date: 2021-11-02
Anticipated expiration: 2031-02-03

Abstract

The utility model provides a compressor unloading structure, which comprises an air inlet buffer arranged on an air cylinder, wherein the air inlet buffer is respectively communicated with a cover side air cylinder and an axle side air cylinder, and the cover side air cylinder and the axle side air cylinder are respectively provided with an air inlet valve and an air outlet valve correspondingly; a first valve is arranged at the communication position of the air inlet buffer and the shaft side air cylinder, and the shaft side air cylinder is also communicated with a feedback channel, or the communication position of the air inlet buffer and the cover side air cylinder is provided with a first valve, and the cover side air cylinder is also communicated with a feedback channel; the feedback channel is communicated with the air inlet buffer, and a second valve is arranged on the feedback channel. Effectual reduction the switching number of times of intake valve on the lid side cylinder or the axle side cylinder that first valve and second valve correspond in this scheme, be favorable to prolonging the pneumatic valve life-span. In addition, gas enters and exits the cover side cylinder through the feedback pipeline, the gas flow area is far larger than the valve gap area of the gas valve, the flow resistance loss is small, and the economical efficiency of the compressor is effectively improved.

Description

Unloading structure of compressor

Technical Field

The utility model belongs to the compressor field especially relates to a compressor off-load structure.

Background

The piston compressor has wide application range, can compress all gases theoretically, can reach the required pressure no matter the flow size, has high volumetric efficiency, can adapt to the working conditions of oil and oil-free, is considered as the most efficient gas compression equipment and is widely applied to various fields of national economy such as refrigeration air conditioners, aerodynamic force, petrochemical industry, natural gas industry and the like. When the compressor is selected, a user usually determines the volume flow of the compressor according to the required maximum gas consumption, but in the actual operation process, the gas consumption is always changed continuously along with different working conditions of a process flow and gas consumption equipment, and when the volume flow is greater than the gas consumption, the gas pressure in a gas exhaust system of the compressor is increased. The pressure rise can cause safety accidents, shorten the service life of the air valve and cause the waste of power, so that the volume flow of the compressor needs to be adjusted to control the pressure change in the pipe network within a certain range.

Because the stepless air quantity regulation and control of the partial stroke top-opening air inlet valve is complex, the equipment is expensive, the valve plate is subjected to extra load to seriously deteriorate the air valve performance, and the service life of the valve plate is shortened, the unloading mode of the full stroke top-opening air inlet valve is generally adopted. The method has the advantages of relatively simple structure, less investment and easy realization, but the valve plate still can be subjected to the extra load of the jacking device during unloading, so the service life is shortened, and the gas flows back through the section of the valve gap, so the resistance loss is large. The invention realizes unloading by air inlet switching, the cover side air inlet valve does not work during adjustment, the valve plate is not acted by extra force (the valve plate is forced by the jacking device in the traditional mode), the opening and closing times of the air inlet valve are reduced, the service life of the air inlet valve is favorably prolonged, in addition, the air directly enters the exhaust cylinder through a pipeline, the flow area is far larger than the valve gap area of the air valve, and the flow resistance loss is small, so the invention is favorable for improving the reliability and the economy of the compressor.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a compressor unloading structure to prolong the service life of an intake valve.

In order to achieve the above and other related objects, the present invention provides an unloading structure for a compressor, including an air inlet buffer disposed on a cylinder, the air inlet buffer is respectively communicated with a cover side cylinder and an axle side cylinder, the cover side cylinder and the axle side cylinder are both correspondingly provided with an air inlet valve and an air outlet valve; a first valve is arranged at the communication position of the air inlet buffer and the shaft side air cylinder, and the shaft side air cylinder is also communicated with a feedback channel, or the communication position of the air inlet buffer and the cover side air cylinder is provided with a first valve, and the cover side air cylinder is also communicated with a feedback channel; the feedback channel is communicated with the air inlet buffer, and a second valve is arranged on the feedback channel.

The exhaust buffer is communicated with the air cylinder, and the air cylinder exhausts air into the exhaust buffer through an exhaust valve.

Furthermore, the cylinder is provided with independent air inlet valve cavities corresponding to the shaft side cylinder and the cover side cylinder respectively, the air inlet valve cavities are communicated with the air inlet buffer through communicating pipes, and the first valve is arranged on the communicating pipes.

Further, an exhaust valve cavity used for exhausting of the exhaust valve is arranged on the cylinder, and the exhaust valve cavity is communicated with the exhaust buffer.

And the air inlet buffer is communicated with the cover side air cylinder or the shaft side air cylinder through a feedback channel.

Further, the cylinder includes a first-stage cylinder and a second-stage cylinder of the compressor, and an air inlet buffer and an air exhaust buffer are respectively arranged on the first-stage cylinder and the second-stage cylinder.

Further, the exhaust buffer of the primary cylinder is communicated with the air inlet buffer of the secondary cylinder.

As described above, the utility model discloses a compressor off-load structure has following beneficial effect:

when the unloading is needed, the second valve is opened, the first valve is closed, the cover side cylinder or the shaft side cylinder which is provided with the feedback channel is communicated with the corresponding air inlet buffer through the feedback channel, and therefore when the cover side cylinder or the shaft side cylinder which is provided with the feedback channel needs to be inflated, the corresponding air inlet valve does not work any more. Effectual reduction the switching number of times of intake valve on the lid side cylinder or the axle side cylinder that first valve and second valve correspond in this scheme, be favorable to prolonging the pneumatic valve life-span. In addition, gas enters and exits the cover side cylinder through the feedback pipeline, the gas flow area is far larger than the valve gap area of the gas valve, the flow resistance loss is small, and the economical efficiency of the compressor is effectively improved.

Drawings

Fig. 1 is a schematic view of an unloading structure of a compressor according to an embodiment of the present invention.

Fig. 2 is a partial schematic view of the unloading structure of the compressor in the embodiment of the present invention.

Detailed Description

Reference numerals in the drawings of the specification include: the device comprises a motor 1, a primary cylinder 2, a secondary cylinder 3, a primary air inlet buffer 4, a primary exhaust buffer 5, a secondary air inlet buffer 6, a secondary exhaust buffer 7, a piston 8, a feedback pipeline 9, a first communicating pipe 10, a second communicating pipe 11, a first air inlet valve 12, a second air inlet valve 13, a second air outlet valve 14, a first air outlet valve 15, a control module 16, a first valve 17, a second valve 18, a first air inlet valve cavity 19, a second air inlet valve cavity 20, an air outlet valve cavity 21, an axial side cylinder 22, a cover side cylinder 23 and a cover side cylinder cover 24.

The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.

Examples

As shown in fig. 1 and 2, the present embodiment provides a compressor unloading structure including: the air cylinder comprises a first-stage air cylinder 2 and a second-stage air cylinder 3, wherein the first-stage air cylinder 2 is provided with a first-stage air inlet buffer 4 and a first-stage air outlet buffer 5, and the second-stage air cylinder 3 is provided with a second-stage air inlet buffer 6 and a second-stage air outlet buffer 7. The inner spaces of the primary cylinder 2 and the secondary cylinder 3 are divided into a shaft-side cylinder 22 and a head-side cylinder 23 by a piston 8.

The cylinder is internally provided with two independent air inlet valve cavities, namely a first air inlet valve cavity 19 for air inlet of a cover side cylinder 23 and a second air inlet valve cavity 20 for air inlet of a shaft side cylinder 22, an air inlet buffer is communicated with the first air inlet valve cavity 19 through a first communicating pipe 10, the air inlet buffer is communicated with the second air inlet valve cavity 20 through a second communicating pipe 11, and the first communicating pipe 10 is provided with a first valve 17; an intake valve for cylinder intake is installed in each intake valve chamber, and an intake valve for intake from the intake valve chamber in the head side cylinder 23 is referred to as a first intake valve 12, and an intake valve for intake from the intake valve chamber in the shaft side cylinder 22 is referred to as a second intake valve 13.

A feedback duct 9 is also provided between the head-side cylinder head 24 and the intake buffer, and the feedback duct 9 communicates the intake buffer with the head-side cylinder 23. A second valve 18 is arranged in the feedback conduit 9. The first valve 17 and the second valve 18 are both connected with the control module 16, and the first valve 17 and the second valve 18 are controlled to work through the control module 16. The control module 16 includes a controller or the like, which may be an existing PLC to control the first valve 17 and the second valve 18. The existing compressor is internally provided with a PLC control system, and when the PLC is used for controlling the first valve 17 and the second valve 18 in the scheme, other control equipment is not required to be added, so that the cost can be effectively reduced.

The cylinder is also provided with an exhaust valve cavity 21, the exhaust valve cavity 21 is communicated with an exhaust buffer corresponding to the cylinder, exhaust valves are arranged on the exhaust valve cavity 21 and correspond to the shaft side cylinder 22 and the cover side cylinder 23, the cover side cylinder 23 is called as a first exhaust valve 15, and the shaft side cylinder 22 is called as a second exhaust valve 14.

During the concrete implementation, the exhaust buffer of one-level cylinder 2 and the buffer intercommunication of admitting air of second grade cylinder 3, communicate between first exhaust buffer and the second buffer of admitting air promptly, drive the crankshaft rotation in the compressor through motor 1 to this piston 8 action that drives actuating cylinder realizes gaseous compression, and compressed gas enters into first exhaust buffer from the discharge valve in one-level cylinder 2, then enters into the second buffer of admitting air, goes out from the second buffer of admitting air after the compression of second grade cylinder 3.

In normal operation, the first valve 17 is opened and the second valve 18 is closed. When the piston 8 moves toward the head-side cylinder 23, the gas inside the head-side cylinder 23 is compressed and discharged from the first exhaust valve into the corresponding exhaust damper, and at the same time, the gas pressure inside the shaft-side cylinder 22 decreases and the second intake valve opens and the gas is introduced from the corresponding intake damper. When the piston 8 moves toward the shaft side cylinder 22, the gas in the shaft side cylinder 22 is compressed and exhausted toward the corresponding exhaust buffer through the second exhaust valve 14; at the same time, the air pressure in the head-side cylinder 23 decreases, and the first intake valve 12 of the head-side cylinder 23 opens to start intake.

When unloading is required, the control module 16 controls the first valve 17 to close and the second valve 18 to open. At this time, when the piston 8 moves toward the axial cylinder 22, the head-side cylinder 23 is supplied with air from the corresponding intake buffer through the feedback pipe 9, the first intake valve 12 is not operated, and only the second intake valve 13 in the axial cylinder 22 is operated. In the scheme, a feedback pipeline 9 is arranged, and a first valve 17 is arranged on the first communication pipe 10. A second valve 18 is arranged in the feedback line 9, in order to deactivate the first inlet valve 12 while the relief is being carried out. Compared with the prior art that the first air inlet valve 12 is forced to be ejected through the ejecting device, the first air inlet valve 12 in the scheme is not forced by the ejecting device any more, and the first air inlet valve 12 is prevented from being damaged by the forced ejecting force. Meanwhile, the opening and closing times of the first air inlet valve 12 are effectively reduced, and the service life of the air valve is prolonged. In addition, gas enters and exits the cover side cylinder 23 through the feedback pipeline 9, the gas flow area is far larger than the valve gap area of the first gas inlet valve 12, the flow resistance loss is small, and the economy of the compressor is effectively improved.

Similarly, the first valve 17 in this embodiment may be disposed on the second communicating pipe 11, and accordingly, the feedback pipeline 9 should be communicated with the shaft-side cylinder 22, so as to achieve unloading.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. The unloading structure of the compressor is characterized by comprising an air inlet buffer arranged on an air cylinder, wherein the air inlet buffer is respectively communicated with a cover side air cylinder and a shaft side air cylinder, and the cover side air cylinder and the shaft side air cylinder are respectively and correspondingly provided with an air inlet valve and an air outlet valve; a first valve is arranged at the communication position of the air inlet buffer and the shaft side air cylinder, and the shaft side air cylinder is also communicated with a feedback channel, or the communication position of the air inlet buffer and the cover side air cylinder is provided with a first valve, and the cover side air cylinder is also communicated with a feedback channel; the feedback channel is communicated with the air inlet buffer, and a second valve is arranged on the feedback channel.

2. The compressor unloading structure according to claim 1, further comprising a discharge buffer, wherein the discharge buffer is communicated with the cylinder, and the cylinder discharges air into the discharge buffer through a discharge valve.

3. The unloading structure for the compressor of claim 1, wherein the cylinder is provided with an independent air inlet valve cavity corresponding to the shaft side cylinder and the cover side cylinder, the air inlet valve cavity is communicated with the air inlet buffer through a communicating pipe, and the first valve is arranged on the communicating pipe.

4. The compressor unloading structure according to claim 2, wherein the cylinder is provided with an exhaust valve cavity for exhaust of an exhaust valve, and the exhaust valve cavity is communicated with the exhaust buffer.

5. The compressor unloading structure according to claim 1, further comprising a control module for controlling opening or closing of the first valve and the second valve, wherein when unloading is performed, the second valve is opened under the control of the control module, the first valve is closed under the control of the control module, and the head-side cylinder or the shaft-side cylinder is communicated with the intake buffer through a feedback passage.

6. The compressor unloading structure according to claim 2, wherein the cylinder comprises a primary cylinder and a secondary cylinder of the compressor, and an air inlet buffer and an air exhaust buffer are respectively arranged on the primary cylinder and the secondary cylinder.

7. The compressor unloading structure according to claim 6, wherein the exhaust buffer of the primary cylinder and the intake buffer of the secondary cylinder communicate.