One-way valve with backflow function and unloading structure of reciprocating compressor

Abstract

The one-way valve with the backflow function and the reciprocating compressor unloading structure comprise an air inlet shell, an air outlet shell and a valve element, the two sides of the valve element are connected with the air inlet shell and the air outlet shell in a sealed mode respectively, and a plurality of backflow channels are formed in the valve element in the circumferential direction at intervals. According to the utility model, the problems that the internal and external pressure difference of the high-precision coalescence type filter element in the exhaust separator is too large and the filter element is shrunken and damaged due to too fast pressure reduction of the exhaust separator when the high-pressure compressor is unloaded are prevented.

Description

Technical Field

[0001] The utility model relates to the field of one-way valves, and more specifically, to a one-way valve with a reflux function. Background Art

[0002] The exhaust pressure of a high-pressure natural gas compressor usually exceeds 20MPa. A high-precision coalescing filter element is used inside the exhaust separator to purify the natural gas for external transmission. When the unit is shut down and unloaded, the exhaust separator pressure drops sharply, the pressure difference between the inside and outside of the filter element increases, and the filter element exceeds its carrying capacity, resulting in "sucking" and damage to the filter element.

[0003] To address this issue, a conventional check valve and a parallel bypass branch with an NPT1 / 2 ferrule are typically installed on the inlet side of the exhaust separator. During normal unit operation, both the conventional check valve and the NPT1 / 2 branch pipe operate normally. During shutdown and unloading, the conventional check valve automatically closes, allowing the high-pressure gas in the exhaust separator to slowly decompress through the NPT1 / 2 parallel branch pipe, reducing the pressure differential between the inlet and exhaust sides of the filter element and preventing the filter element from deflation. This approach can address the filter element deflation problem, but it adds a ferrule-type parallel branch pipe, which poses certain risks under high pressure. Summary of the Invention

[0004] The purpose of the utility model is to provide a one-way valve with a reflux function and a reciprocating compressor unloading structure to prevent the exhaust separator from reducing pressure too quickly when the high-pressure compressor is unloaded, resulting in excessive pressure difference between the inside and outside of the high-precision coalescing filter element in the exhaust separator, causing the filter element to be "sucked" and damaged.

[0005] The technical solution adopted by the present invention to solve this technical problem is: a one-way valve with a reflux function, comprising: an air inlet housing, an air outlet housing and a valve core, the two sides of the valve core are sealed with the air inlet housing and the air outlet housing respectively, and a plurality of reflux channels are circumferentially spaced apart on the valve core.

[0006] As a further solution of the present invention, a detachable plugging head is provided on the reflux channel.

[0007] As a further solution of the present invention, both sides of the valve core are connected to the air inlet housing and the air outlet housing respectively through stainless steel gaskets; flanges are installed on the outside of the air inlet housing and the air outlet housing, and the two flanges are connected by bolts.

[0008] As a further solution of the present invention, connecting plates are provided at the top and bottom ends of the air inlet housing and the air outlet housing, and the connecting plates are connected to the air inlet housing and the air outlet housing by bolts. The connecting plates play a positioning role and ensure the firmness of the one-way valve structure.

[0009] As a further solution of the present invention, a lifting lug is fixed to the upper end of the valve core.

[0010] The utility model also provides a reciprocating compressor unloading structure, wherein the one-way valve is installed between the final cooling outlet pipeline of the compressor air cooler and the air inlet pipeline of the exhaust separator.

[0011] This utility model has at least the following beneficial effects: With the use of a one-way valve with backflow, air flows from the inlet to the outlet of the one-way valve during normal operation. The one-way valve is open, and the system operates normally. When the unit is shut down and unloaded, high-pressure gas flows back. The main structure of the one-way valve blocks the backflow, preventing rapid backflow of high-pressure gas into the system. The backflow is then slowly unloaded into the compressor system through the small holes in the one-way valve plate, preventing damage to the exhaust separator filter element due to "sucking." The one-way valve utilizes a mechanical structure, making it safe, reliable, and cost-effective.

[0012] Other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic structural diagram of a one-way valve with a reflux function according to the present invention;

[0014] Figure 2 This is a structural diagram of the valve core of the utility model;

[0015] Figure 3 It is a connection diagram of the unloading structure of the reciprocating compressor of the present invention.

[0016] Among them, 1- one-way valve, 2- compressor air cooler, 3- exhaust separator, 4- air inlet housing, 5- air outlet housing, 6- valve core, 7- reflux channel, 8- connecting plate, 9- bolt, 10- stainless steel gasket, 11- lifting ear. DETAILED DESCRIPTION

[0017] The following is a detailed and complete description of the present invention in conjunction with the accompanying drawings. A person skilled in the art will be able to implement the present invention based on this description. Before describing the present invention in conjunction with the accompanying drawings, it should be noted that the technical solutions and technical features provided in various parts of the present invention, including the following description, may be combined with each other unless they conflict.

[0018] In addition, the embodiments of the present invention described below are generally only part of the embodiments of the present invention, rather than all of the embodiments. Therefore, based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative effort should fall within the scope of protection of the present invention.

[0019] The following is a further detailed description of the present invention in conjunction with the accompanying drawings and embodiments, and the specific implementation process is as follows:

[0020] like Figures 1 and 2 As shown, the utility model provides a one-way valve 1 with a reflux function, comprising: an air inlet housing 4, an air outlet housing 5 and a valve core 6, the two sides of the valve core 6 are sealed with the air inlet housing 4 and the air outlet housing 5 respectively, and a plurality of reflux channels 7 are circumferentially spaced apart on the valve core 6. Except for the reflux channels 7, the other structures of the valve core 6 of the present application are the valve core 6 of a conventional one-way valve 1.

[0021] This technical solution may also include the following technical details to better achieve the technical effect: a detachable plugging head is provided on the reflux channel 7, and the number of reflux channels 7 opened can be determined according to the actual situation on site.

[0022] This technical solution may also include the following technical details to better achieve the technical effect: the two sides of the valve core 6 are respectively connected to the air inlet housing 4 and the air outlet housing 5 through stainless steel gaskets 10; flanges are installed on the outside of the air inlet housing 4 and the air outlet housing 5, and the two flanges are connected by bolts 9, thereby tightening the stainless steel gasket 10 to ensure the air tightness of the one-way valve 1.

[0023] The specifications of the check valve 1 with a reflux function are selected according to the pipeline specifications and flange connection is used. The unloading reflux volume is determined according to the load capacity of the exhaust separator 3 filter element. The reflux hole area of ​​the check valve 1 valve plate is calculated based on the unloading reflux volume. A multi-hole symmetrical layout is used. The number and area of ​​the reflux holes are adjusted according to the unloading reflux volume under different operating conditions to ensure normal unloading of the unit.

[0024] This technical solution may also include the following technical details to better achieve the technical effect: a connecting plate 8 is provided at the top and bottom ends of the air inlet housing 4 and the air outlet housing 5, and the connecting plate 8 is connected to the air inlet housing 4 and the air outlet housing 5 by bolts 9. By providing the connecting plate 8, a positioning function is played to ensure the firmness of the structure of the one-way valve 1.

[0025] This technical solution can also include the following technical details to better achieve the technical effect: a lifting ear 11 is fixed to the upper end of the valve core 6 to facilitate the lifting and transportation of the valve core 6. After the lifting ear 11 is set, a hole is opened on the connecting plate 8 at the top of the air inlet shell 4 and the air outlet shell 5 to ensure that the lifting ear 11 passes through smoothly.

[0026] This solution provides a reciprocating compressor unloading structure, in which a one-way valve 1 with a reflux function is installed between the final cooling outlet pipeline of the compressor air cooler 2 and the air inlet pipeline of the exhaust separator 3. Figure 3 As shown, only one one-way valve 1 with a reflux function is set on the pipeline. Its structure is simple. When working normally, the one-way valve 1 maintains normal circulation of the pipeline and has no impact on the system. When unloading reflux, it automatically prevents the high-pressure process gas from quickly refluxing in a short time, reducing the pressure difference on both sides of the exhaust separator 3 filter element, avoiding the "sucking" phenomenon caused by excessive pressure difference on both sides of the exhaust separator 3 filter element, protecting the filter element, and increasing the service life of the filter element.

[0027] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. 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 embodiments shown and described herein.

Claims

1. A one-way valve with reflux function, characterized in that: include: An air inlet housing, an air outlet housing and a valve core. The two sides of the valve core are sealed with the air inlet housing and the air outlet housing respectively. A plurality of return channels are spaced apart along the circumferential direction on the valve core.

2. The one-way valve with reflux function according to claim 1, characterized in that: The reflux channel is provided with a detachable plugging head.

3. The one-way valve with reflux function according to claim 1, characterized in that: The two sides of the valve core are respectively connected to the air inlet housing and the air outlet housing through stainless steel gaskets; flanges are installed on the outside of the air inlet housing and the air outlet housing, and the two flanges are connected by bolts.

4. The one-way valve with reflux function according to claim 3, characterized in that: The top and bottom ends of the air inlet housing and the air outlet housing are provided with connecting plates, which are connected to the air inlet housing and the air outlet housing by bolts. The connecting plates play a positioning role and ensure the firmness of the one-way valve structure.

5. The one-way valve with reflux function according to claim 1 or 4, characterized in that: A lifting lug is fixed to the upper end of the valve core.

6. A reciprocating compressor unloading structure, characterized in that: A one-way valve as claimed in any one of claims 1 to 5 is installed between the final cooling outlet pipeline of the compressor air cooler and the air inlet pipeline of the exhaust separator.

Images