Overflow control method of booster compressor

Abstract

According to the overflow control method for the booster compressor, when the pressure of a closed hydraulic part is too high, a pressure control valve is opened, and hydraulic oil of the closed hydraulic part flows to an oil outlet from an oil supply port, so that the pressure of the closed hydraulic part is limited; meanwhile, an air control port is formed in the pressure control valve, and the pressure control valve automatically adjusts the overflow pressure according to the change of the exhaust pressure through the air control port. The pressure of the closed hydraulic part can be limited by controlling the opening and closing of the pressure control valve, and the actual overflow pressure can be automatically adjusted according to different exhaust pressures, so that the energy consumption of the system is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of compressors, and in particular to an overflow control method for a booster compressor. Background Art

[0002] The ion compressor is a special type of positive displacement compressor. It is mainly composed of a gas compression part, a hydraulic drive part, and a variable diameter piston for transmission. Its working principle is that in the hydraulic drive part, a reciprocating pump with a volume change chamber drives the hydraulic oil to flow into and out of the lower part of the combined cylinder body, thereby driving the variable diameter piston in the combined cylinder body to reciprocate. The gas compression part is above the variable diameter piston, and the intake, compression, exhaust and expansion processes are completed with the cooperation of the intake and exhaust valves. The ion compressor has the advantages of good sealing performance, high volumetric efficiency and large exhaust volume.

[0003] Overflow loss in the ion compressor process is the main cause of equipment energy loss. The size of the overflow loss is related to the overflow pressure. When the overflow pressure is too large, the drive pump needs to work externally under high pressure, but it is not used for the reciprocating drive of the variable piston, but converted into the internal energy of the hydraulic oil after the overflow, resulting in energy waste. At the same time, the gas pressure range of each compression stage is different, while the pressure range of the hydraulic part is similar. How to meet the control requirements of each compression stage and reduce the production cost of the pressure control valve is also a problem that needs to be solved. Summary of the invention

[0004] In order to solve the problems of the prior art, the present invention provides a booster compressor overflow control method, which can limit the pressure of the closed hydraulic part by controlling the opening and closing of the pressure control valve, and can automatically adjust the actual overflow pressure according to the exhaust pressure, thereby reducing the energy consumption of the system.

[0005] The present invention provides an overflow control device for a booster compressor, comprising a combined cylinder body, a variable-diameter piston being arranged in the combined cylinder body, a gas chamber being arranged above the variable-diameter piston, the gas chamber being connected with an air inlet and an exhaust port, a hydraulic oil chamber being arranged below the variable-diameter piston, the hydraulic oil chamber being connected with a reciprocating pump via a connecting pipe, the pump chamber of the reciprocating pump, the hydraulic part of the combined cylinder body and the connecting pipe together forming a closed hydraulic part, the closed hydraulic part being connected with a pressure control valve, the pressure control valve comprising an oil supply port, an oil outlet port and an air control port, the oil supply port being connected with the closed hydraulic part via a pipe, the air control port being connected with the exhaust port via a pipe, and the hydraulic oil overflowing in the pressure control valve being discharged from the oil outlet port.

[0006] Further improvement, the pressure control valve also includes an external control port, a main valve and a pilot valve, the pilot valve includes a valve head and a valve core connected by a spring, one side of the valve head is subjected to the pressure of the oil supply port, and the valve core is subjected to the pressure of the air control port and the spring force; the external control port is connected to the oil supply port, and the main valve is arranged in the oil supply port. After the main valve is opened, the hydraulic oil in the oil supply port flows to the oil outlet, and the opening and closing of the main valve is controlled by the pilot valve and the external control port.

[0007] The booster compressor overflow control method of the booster compressor overflow control device is as follows: when the pressure of the closed hydraulic part is too high, the pressure control valve opens, and the hydraulic oil of the closed hydraulic part flows from the oil supply port to the oil outlet, thereby limiting the pressure of the closed hydraulic part; at the same time, an air control port is installed on the pressure control valve, and the pressure control valve automatically adjusts the overflow pressure according to the change of the exhaust pressure through the air control port.

[0008] The specific process of the pressure control valve adjusting the overflow pressure through the air control port is as follows: When the pressure at the oil supply port is greater than the sum of the gas force at the air control port and the spring force of the pilot valve, the pilot valve opens, causing the pressure before the pilot valve to decrease, thereby causing the main valve to open and begin to overflow, and the hydraulic oil flows from the oil supply port to the oil outlet; When the pressure at the oil supply port decreases and is less than the sum of the gas force at the air control port and the spring force of the pilot valve, the pilot valve closes, causing the main valve to close and the overflow to end.

[0009] The beneficial effects of the present invention are: 1. Taking into account the effect of exhaust pressure changes on the overflow pressure of the oil supply port, the pressure of the closed hydraulic part can be limited by controlling the opening and closing of the pressure control valve.

[0010] 2. The pressure control valve only needs to replace a small number of parts to meet the control requirements of different compression levels, reducing the production cost of the pressure control valve.

[0011] 3. It can automatically adjust the actual overflow pressure according to the different exhaust pressures, thereby reducing the energy consumption of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a schematic diagram of the overflow control method of the booster compressor in an embodiment of the present invention.

[0014] Figure 21 is a structural diagram of a pressure control valve of a boost compressor in an embodiment of the present invention.

[0015] Reference numerals: 1. Oil supply port, 2. Oil outlet port, 3. External control port, 4. Main valve, 5. Pilot valve, 6. Air control port, 7. Air inlet port, 8. Exhaust port, 9. Combined cylinder body, 10. Variable diameter piston, 11. Reciprocating pump, 12. Pressure control valve, 13. Closed hydraulic part, 14. Valve core. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] like Figure 1 As shown, due to the working characteristics of the compressor, the gas on the upper side of the variable-diameter piston 10 needs to go through four stages in a single cycle, namely, compression, exhaust, expansion, and intake. The gas pressure is in a fluctuating state in a single cycle, so the pressure of the closed hydraulic part 13 fluctuates within a certain range. The booster compressor overflow control method disclosed in the present invention is that when the pressure of the closed hydraulic part 13 is too high, the pressure control valve 12 is opened, and the hydraulic oil of the closed hydraulic part 13 can flow from the oil supply port 1 to the oil outlet port 2, thereby limiting the pressure of the closed hydraulic part 13. At the same time, the pressure control valve 12 can also automatically adjust the overflow pressure through the air control port 6 taking into account the changes in the exhaust pressure, thereby reducing the overflow energy consumption of the equipment.

[0018] The present invention discloses a preferred structure of a pressure control valve. Figure 2 As shown, in order to achieve automatic adjustment to a low-energy overflow pressure that adapts to variable working conditions, the present invention adds an air control port 6 to the traditional plug-in overflow valve, and the gas pressure in the air control port 6 can act on the pilot valve core 14. The pressure control valve 12 also includes an external control port 3, a main valve 4 and a pilot valve 5. The pilot valve 5 includes a valve head and a valve core 14 connected by a spring. One side of the valve head is affected by the pressure of the oil supply port 1, and the valve core 14 is affected by the pressure of the air control port 6 and the spring force; the external control port 3 is connected to the oil supply port 1, and the main valve 4 is arranged in the oil supply port 1. After the main valve 4 is opened, the hydraulic oil in the oil supply port 1 flows to the oil outlet 2, and the opening and closing of the main valve 4 is controlled by the pilot valve 5 and the external control port 3.

[0019] When the pressure of the oil supply port 1 does not meet the overflow condition, the pilot valve 5 is in a closed state. When the pressure of the oil supply port 1 meets the overflow condition, the valve core of the pilot valve 5 overcomes the spring force and opens. The hydraulic oil passes through the valve gap of the pilot valve 5, and a pressure difference is formed between the upper and lower parts of the main valve 4. The pressure difference causes the main valve 4 to open, thereby achieving overflow through the main valve 4.

[0020] When the pressure control valve 12 is working normally with overflow, the external control port 3 is in a high pressure state, and the opening and closing of the main valve 4 is mainly controlled by the opening and closing of the pilot valve 5. When the pressure control valve 12 needs to maintain the overflow state, the external control port 3 is placed in a low pressure state. At this time, a pressure difference is formed between the upper and lower parts of the main valve 4, thereby causing the main valve 4 to open.

[0021] When the pressure of the oil supply port 1 is greater than the sum of the gas force of the air control port 6 and the spring force of the pilot valve 5, the pilot valve 5 opens, causing the pressure before the pilot valve 5 to decrease, thereby causing the main valve 4 to open and overflow to begin, and the hydraulic oil flows from the oil supply port 1 to the oil outlet 2; similarly, when the pressure of the oil supply port 1 decreases and is less than the sum of the gas force of the air control port 6 and the spring force of the pilot valve 5, the pilot valve 5 closes, causing the main valve 4 to close and the overflow to end. The structural main body of the pressure control valve 12 of each compression stage is the same, and the only different parts are the size of the air control port 6 and the structural size of the side of the pilot valve core 14 that is affected by the gas pressure. Therefore, different air control ports 6 and pilot valve core 14 accessories can be replaced for pressure control valves 12 of different compression stages, which is convenient to replace and reduces the production cost of the pressure control valve.

[0022] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, the above is only a preferred embodiment of the present invention. Since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field is within the technical scope disclosed by the present invention. For ordinary technicians in the technical field, changes or replacements that can be easily thought of should be covered within the protection scope of the present invention without departing from the principle of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for controlling overflow of a booster compressor, characterized in that: A booster compressor overflow control device is used. When the pressure of the closed hydraulic part (13) is too high, the pressure control valve (12) opens, and the hydraulic oil of the closed hydraulic part (13) flows from the oil supply port (1) to the oil outlet port (2), thereby limiting the pressure of the closed hydraulic part (13). At the same time, an air control port (6) is installed on the pressure control valve (12). The pressure control valve (12) automatically adjusts the overflow pressure according to the change of the exhaust pressure through the air control port (6).

2. The booster compressor overflow control method according to claim 1, characterized in that: The specific process of the pressure control valve (12) adjusting the overflow pressure through the air control port (6) is as follows: When the pressure at the oil supply port (1) is greater than the sum of the gas force at the air control port (6) and the spring force of the pilot valve (5), the pilot valve (5) opens, causing the pressure in front of the pilot valve (5) to decrease, thereby causing the main valve (4) to open and begin to overflow, and the hydraulic oil flows from the oil supply port (1) to the oil outlet port (2); When the pressure at the oil supply port (1) decreases and becomes less than the sum of the gas force at the air control port (6) and the spring force of the pilot valve (5), the pilot valve (5) closes, causing the main valve (4) to close and the overflow to end.

3. The booster compressor overflow control method according to claim 1 or 2, characterized in that: The booster compressor overflow control device adopted comprises a combined cylinder body (9), a variable diameter piston (10) is arranged in the combined cylinder body (9), a gas chamber is arranged above the variable diameter piston (10), the gas chamber is connected to an air inlet (7) and an air outlet (8), a hydraulic oil chamber is arranged below the variable diameter piston (10), the hydraulic oil chamber is connected to a reciprocating pump (11) through a connecting pipe, the pump chamber of the reciprocating pump (11), the hydraulic part of the combined cylinder body (9), and the connecting pipe together constitute a closed hydraulic part (13), characterized in that: the closed hydraulic part (13) is connected to a pressure control valve (12), the pressure control valve (12) comprises an oil supply port (1), an oil outlet port (2) and an air control port (6), the oil supply port (1) is connected to the closed hydraulic part (13) through a pipe, the air control port (6) is connected to the air outlet (8) through a pipe, and the hydraulic oil overflowing in the pressure control valve (12) is discharged from the oil outlet port (2).

4. The booster compressor overflow control device according to claim 3, characterized in that: The pressure control valve (12) further comprises an external control port (3), a main valve (4) and a pilot valve (5); the pilot valve (5) comprises a valve head and a valve core (14) connected by a spring; one side of the valve head is subjected to the pressure of the oil supply port (1); the valve core (14) is subjected to the pressure of the air control port (6) and the elastic force of the spring; the external control port (3) is connected to the oil supply port (1); the main valve (4) is arranged in the oil supply port (1); after the main valve (4) is opened, the hydraulic oil in the oil supply port (1) flows to the oil outlet (2); the opening and closing of the main valve (4) is controlled by the pilot valve (5) and the external control port (3).

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