Automatic control system and method for loading and unloading of reciprocating compressor

Abstract

The invention discloses a reciprocating compressor loading and unloading automatic control system which is characterized in that an exhaust valve and a backflow regulating valve are mounted on a reciprocating compressor, and a first pressure sensor is arranged on the exhaust valve and used for monitoring the exhaust pressure P2 of the compressor in real time; a second pressure sensor is arranged on the backflow adjusting valve and used for monitoring the air inlet pressure P1 of the backflow compressor in real time; when the reciprocating compressor unit is loaded, the controller controls the backflow regulating valve to start to be closed step by step; when the exhaust pressure P2 of the compressor is close to the exhaust pipe network pressure P3, the controller controls the exhaust valve to be opened immediately; when the backflow adjusting valve is completely closed and the reciprocating compressor is loaded, the compressor runs more stably by accurately controlling the action and the opening degree of the valve, vibration and abnormal sound of a reciprocating compressor unit are avoided, an outlet one-way valve of the reciprocating compressor unit is omitted, and configuration of the reciprocating compressor unit is simplified.

Description

Technical Field

[0001] The present invention relates to the field of automatic control systems for loading and unloading reciprocating compressors, and more specifically, to an automatic control system and method for loading and unloading reciprocating compressors. Background Art

[0002] Reciprocating compressors are generally equipped with an outlet check valve at the exhaust end to prevent external high-pressure gas from entering the system before the unit is loaded and operated. However, when the unit is normally operated after loading, the unreasonable design of the outlet check valve channel can easily cause vibration and abnormal noise of the unit. By accurately controlling the opening action of the compressor automatic valve and eliminating the outlet check valve, abnormal noise during normal loading and operation of the unit can be avoided. Summary of the invention

[0003] In order to achieve these purposes and other advantages according to the present invention, a preferred embodiment of the present invention provides a reciprocating compressor loading and unloading automatic control system, wherein an exhaust valve is installed on the exhaust pipe of the reciprocating compressor, the exhaust pipe and the intake pipe of the reciprocating compressor are connected through a return pipe, a return regulating valve is installed on the return pipe, and the exhaust network pipe is connected to the exhaust pipe of the reciprocating compressor, characterized in that the reciprocating compressor loading and unloading automatic control system comprises a first pressure sensor, a second pressure sensor, a third pressure sensor and a controller;

[0004] The first pressure sensor is provided at the front side of the exhaust valve for real-time monitoring of the exhaust pressure P2 of the compressor; the second pressure sensor and the third pressure sensor are provided at the front and rear sides of the reflux regulating valve, respectively, and the second pressure sensor is used to monitor the intake pressure P1 of the reciprocating compressor in real-time;

[0005] When the reciprocating compressor unit is loaded, the controller controls the reflux regulating valve to start closing gradually; and when the exhaust pressure P2 of the compressor is close to the exhaust pipe network pressure P3, the controller controls the exhaust valve to open immediately; when the reflux regulating valve is completely closed, the reciprocating compressor is loaded.

[0006] According to a preferred embodiment of the present invention, the following steps are also included:

[0007] When the reciprocating compressor unit is unloaded, the controller controls the reflux regulating valve to open gradually, and when its opening reaches a predetermined value, the controller controls the exhaust valve to close; when the reflux regulating valve is fully opened, the reciprocating compressor is unloaded.

[0008] According to a preferred embodiment of the present invention, when the reciprocating compressor is unloaded, the controller controls the reflux regulating valve to open slowly, and when the opening reaches 10%, the exhaust valve is immediately closed until the reflux regulating valve is fully opened, at which time the reciprocating compressor is unloaded.

[0009] According to a preferred embodiment of the present invention, when the reciprocating compressor unit is started and loaded, the reflux regulating valve begins to gradually close, the exhaust pressure P2 of the compressor gradually increases, ΔP = P3-P2, and ΔP gradually decreases;

[0010] When ΔP﹤0.5MPa, the internal and external pressure difference is small, and the controller controls the exhaust automatic valve to open;

[0011] Reduce the impact of the pressure difference between the inside and outside of the compressor system on the delivery pipeline. When ΔP = 0, the reflux regulating valve is completely closed and the compressor delivers gas normally to the outside.

[0012] According to a preferred embodiment of the present invention, when the reciprocating compressor unit is unloaded, the controller controls the reflux regulating valve to open gradually. When the opening of the reflux regulating valve is 10%, the controller controls the exhaust valve to close. When the reflux regulating valve is fully opened, the unloading of the reciprocating compressor is completed.

[0013] Another preferred embodiment of the present invention provides a reciprocating compressor loading and unloading automatic control method, which comprises the following steps:

[0014] S1. A first pressure sensor is provided on the exhaust valve to monitor the exhaust pressure P2 of the compressor in real time; a second pressure sensor is provided on the reflux regulating valve to monitor the intake pressure P1 of the reflux compressor in real time;

[0015] S2, when the reciprocating compressor unit is loaded, the controller controls the reflux regulating valve to start closing gradually; and when the exhaust pressure P2 of the compressor is close to the exhaust pipe network pressure P3, the controller controls the exhaust valve to open immediately; when the reflux regulating valve is completely closed, the reciprocating compressor is loaded;

[0016] S3. When the reciprocating compressor unit is unloaded, the controller controls the reflux regulating valve to open gradually, and when the opening reaches a predetermined value, the controller controls the exhaust valve to close; when the reflux regulating valve is fully opened, the reciprocating compressor is unloaded.

[0017] The present invention includes at least the following beneficial effects: the present invention makes the compressor run more smoothly by accurately controlling the movement and opening of the valve, avoids the vibration and abnormal noise of the reciprocating compressor unit, eliminates the outlet check valve of the reciprocating compressor unit, and simplifies the configuration of the reciprocating compressor unit.

[0018] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1It is a structural schematic diagram of the reciprocating compressor loading and unloading automatic control system in the present invention. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0021] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0022] Those skilled in the art should understand that, in the disclosure of the present invention, the orientation or position relationship indicated by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0023] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0024] like Figure 1 As shown, a preferred embodiment of the present invention provides a reciprocating compressor loading and unloading automatic control system, the exhaust pipe 2 of the reciprocating compressor 1 is installed with an exhaust valve 3, the exhaust pipe 2 of the reciprocating compressor and the intake pipe 4 are connected through a return pipe 5, the return pipe 5 is installed with a return regulating valve 6, the exhaust network pipe is connected to the exhaust pipe of the reciprocating compressor, and the reciprocating compressor loading and unloading automatic control system includes a first pressure sensor 7, a second pressure sensor 8, a third pressure sensor 9 and a controller;

[0025] The first pressure sensor 7 is provided at the front side of the exhaust valve for real-time monitoring of the exhaust pressure P2 of the compressor; the second pressure sensor 8 and the third pressure sensor 9 are provided at the front and rear sides of the reflux regulating valve, respectively, and the second pressure sensor is used to monitor the intake pressure P1 of the reciprocating compressor in real-time;

[0026] When the reciprocating compressor unit is loaded, the controller controls the reflux regulating valve to start closing gradually; and when the exhaust pressure P2 of the compressor is close to the exhaust pipe network pressure P3, the controller controls the exhaust valve to open immediately; when the reflux regulating valve is completely closed, the reciprocating compressor is loaded.

[0027] In the above technical solution, the outlet check valve of the reciprocating compressor unit is cancelled, the configuration of the reciprocating compressor unit is simplified, and the first pressure sensor and the second pressure sensor are directly installed on the exhaust valve and the reflux regulating valve respectively. By comparing the pressure values, the automatic valve action is accurately controlled to ensure the safety of the compressor system, make the compressor run more smoothly, and avoid the vibration and abnormal noise of the reciprocating compressor unit.

[0028] According to a preferred embodiment of the present invention, when the reciprocating compressor is unloaded, the controller controls the reflux regulating valve to open slowly, and when the opening reaches 10%, the exhaust valve is immediately closed until the reflux regulating valve is fully opened, at which time the reciprocating compressor is unloaded. When the valve opening is kept below 10%, the air flow can be ensured to pass stably, and the opening time is relatively short.

[0029] According to a preferred embodiment of the present invention, when the reciprocating compressor unit is started and loaded, the reflux regulating valve begins to gradually close, the exhaust pressure P2 of the compressor gradually increases, ΔP = P3-P2, and ΔP gradually decreases;

[0030] When ΔP﹤0.5MPa, the internal and external pressure difference is small, the internal and external impact of the system is small, and the controller controls the exhaust automatic valve to open;

[0031] Reduce the impact of the pressure difference between the inside and outside of the compressor system on the delivery pipeline. When ΔP = 0, the reflux regulating valve is completely closed and the compressor delivers gas normally to the outside.

[0032] According to a preferred embodiment of the present invention, when the reciprocating compressor unit is unloaded, the controller controls the reflux regulating valve to open gradually. When the opening of the reflux regulating valve is 10%, the controller controls the exhaust valve to close. When the reflux regulating valve is fully opened, the unloading of the reciprocating compressor is completed.

[0033] Another preferred embodiment of the present invention provides a reciprocating compressor loading and unloading automatic control method, which comprises the following steps:

[0034] S1. A first pressure sensor is provided on the exhaust valve to monitor the exhaust pressure P2 of the compressor in real time; a second pressure sensor is provided on the reflux regulating valve to monitor the intake pressure P1 of the reflux compressor in real time;

[0035] S2, when the reciprocating compressor unit is loaded, the controller controls the reflux regulating valve to start closing gradually; and when the exhaust pressure P2 of the compressor is close to the exhaust pipe network pressure P3, the controller controls the exhaust valve to open immediately; when the reflux regulating valve is completely closed, the reciprocating compressor is loaded;

[0036] S3. When the reciprocating compressor unit is unloaded, the controller controls the reflux regulating valve to open gradually, and when the opening reaches a predetermined value, the controller controls the exhaust valve to close; when the reflux regulating valve is fully opened, the reciprocating compressor is unloaded.

[0037] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. An automatic control system for loading and unloading a reciprocating compressor, wherein an exhaust valve is installed on the exhaust pipe of the reciprocating compressor, the exhaust pipe and the intake pipe of the reciprocating compressor are connected via a return pipe, a return regulating valve is installed on the return pipe, and an exhaust network pipe is connected to the exhaust pipe of the reciprocating compressor, characterized in that: The reciprocating compressor loading and unloading automatic control system comprises a first pressure sensor, a second pressure sensor, a third pressure sensor and a controller; The first pressure sensor is provided at the front side of the exhaust valve for real-time monitoring of the exhaust pressure P2 of the compressor; the second pressure sensor and the third pressure sensor are provided at the front and rear sides of the reflux regulating valve, respectively, and the second pressure sensor is used to monitor the intake pressure P1 of the reciprocating compressor in real-time; When the reciprocating compressor unit is loaded, the controller controls the reflux regulating valve to start closing gradually; and when the exhaust pressure P2 of the compressor is close to the exhaust pipe network pressure P3, the controller controls the exhaust valve to open immediately; when the reflux regulating valve is completely closed, the reciprocating compressor is loaded.

2. The reciprocating compressor loading and unloading automatic control system according to claim 1, characterized in that: The following steps are also included: When the reciprocating compressor unit is unloaded, the controller controls the reflux regulating valve to open gradually, and when its opening reaches a predetermined value, the controller controls the exhaust valve to close; when the reflux regulating valve is fully opened, the reciprocating compressor is unloaded.

3. The reciprocating compressor loading and unloading automatic control system according to claim 2, characterized in that: When the reciprocating compressor is unloaded, the controller controls the reflux regulating valve to open slowly, and when the opening reaches 10%, the exhaust valve is immediately closed until the reflux regulating valve is fully opened, at which time the reciprocating compressor is unloaded.

4. The reciprocating compressor loading and unloading automatic control system according to claim 1, characterized in that: When the reciprocating compressor unit is started and loaded, the return flow regulating valve begins to close gradually, the exhaust pressure P2 of the compressor gradually increases, ΔP = P3-P2, and ΔP gradually decreases; When ΔP﹤0.5MPa, the internal and external pressure difference is small, and the controller controls the exhaust automatic valve to open; When ΔP=0, the reflux regulating valve is completely closed and the compressor supplies gas to the outside normally.

5. The reciprocating compressor loading and unloading automatic control system according to claim 4, characterized in that: When the reciprocating compressor unit is unloaded, the controller controls the reflux regulating valve to open gradually. When the reflux regulating valve opening is 10%, the controller controls the exhaust valve to close. When the reflux regulating valve is fully opened, the reciprocating compressor is unloaded.

6. An automatic control method based on the reciprocating compressor loading and unloading automatic control system according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. A first pressure sensor is provided on the exhaust valve to monitor the exhaust pressure P2 of the compressor in real time; a second pressure sensor is provided on the reflux regulating valve to monitor the intake pressure P1 of the reflux compressor in real time; S2, when the reciprocating compressor unit is loaded, the controller controls the reflux regulating valve to start closing gradually; and when the exhaust pressure P2 of the compressor is close to the exhaust pipe network pressure P3, the controller controls the exhaust valve to open immediately; when the reflux regulating valve is completely closed, the reciprocating compressor is loaded; S3. When the reciprocating compressor unit is unloaded, the controller controls the reflux regulating valve to open gradually, and when the opening reaches a predetermined value, the controller controls the exhaust valve to close; when the reflux regulating valve is fully opened, the reciprocating compressor is unloaded.

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