Booster compressor starting and stopping device

Abstract

The utility model provides a booster compressor start-stop device which comprises a combined cylinder body, a variable-diameter piston is arranged in the combined cylinder body, a gas chamber is arranged above the variable-diameter piston, the gas chamber is connected with a gas inlet and a gas outlet, a hydraulic oil chamber is arranged below the variable-diameter piston, and the hydraulic oil chamber is connected with a reciprocating pump through a connecting pipeline. A pump cavity of the reciprocating pump, a hydraulic part of the combined cylinder body and a connecting pipeline jointly form a closed hydraulic part. The closed hydraulic part is connected with a pressure control valve and a one-way valve; the one-way valve supplements hydraulic oil to the closed hydraulic part; overflowed hydraulic oil of the closed hydraulic part enters the pressure control valve through an oil inlet of the pressure control valve and is discharged through an oil outlet of the pressure control valve, and an external control port of the pressure control valve controls the overflow pressure of the pressure control valve. According to the utility model, air suction in the hydraulic element caused by incompletely stopping rotation of the pump during shutdown can be avoided, the start-stop times of the motor are reduced as much as possible, and the device is better suitable for clearance working scenes such as hydrogen refueling stations.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, in particular to a start-stop device for a booster compressor. Background Art

[0002] An ion compressor is a special type of positive displacement compressor. It primarily consists of a gas compression section, a hydraulic drive section, and a variable-diameter piston for transmission. Its operating principle is that in the hydraulic drive section, a reciprocating pump with a volume-changing chamber drives hydraulic oil into and out of the lower portion of a combined cylinder, which in turn drives the variable-diameter piston within the combined cylinder to reciprocate. Above the variable-diameter piston is the gas compression section, where intake and exhaust valves work together to complete the intake, compression, exhaust, and expansion processes. Ion compressors offer advantages such as excellent sealing performance, high volumetric efficiency, and large exhaust volume.

[0003] The start-up and shutdown methods of ion compressors affect the safety and lifespan of the equipment. Improper start-up and shutdown methods can lead to prolonged piston impact with the cylinder and internal cavitation of hydraulic components. Frequent starts and stops in intermittent operation can damage the motor insulation, increasing the risk of failure. Utility Model Content

[0004] In order to solve the problems of the prior art, the utility model provides a start-stop device for a booster compressor, which can avoid the internal suction of the hydraulic component due to the pump not completely stopping rotation when shutting down, and the situation where the variable diameter piston hits the cylinder body for a long time in the transition state from stationary to reciprocating work. It can minimize the number of starts and stops of the motor and better adapt to the scenarios of intermittent work such as hydrogen filling stations.

[0005] The utility model provides a booster compressor start-stop device, comprising a combined cylinder body, a variable-diameter piston being arranged in the combined cylinder body, a gas chamber being formed above the variable-diameter piston, the gas chamber being connected to an air inlet and an exhaust port, a hydraulic oil chamber being formed below the variable-diameter piston, the hydraulic oil chamber being connected to a reciprocating pump via a connecting pipe, and the reciprocating pump chamber, the hydraulic part of the combined cylinder body, and the connecting pipe together constitute a closed hydraulic part.

[0006] The closed hydraulic part is connected to a pressure control valve and a one-way valve, and the one-way valve replenishes hydraulic oil to the closed hydraulic part; the pressure control valve includes a pressure control valve oil inlet, a pressure control valve oil outlet and a pressure control valve external control port, and the hydraulic oil overflowing from the closed hydraulic part enters the pressure control valve through the pressure control valve oil inlet and is discharged through the pressure control valve oil outlet, and the pressure control valve external control port controls the overflow pressure of the pressure control valve.

[0007] The one-way valve comprises a one-way valve oil inlet and a one-way valve oil outlet, the one-way valve oil outlet is connected to the closed hydraulic part, and the one-way valve oil inlet is connected to a stable pressure source device.

[0008] The booster compressor start and stop method is as follows:

[0009] The starting sequence of the booster compressor is as follows: adjust the external control port of the pressure control valve so that the overflow pressure of the pressure control valve is at the lowest state; turn on the stable pressure source device; and the reciprocating pump starts reciprocating operation.

[0010] When the variable-diameter piston begins to work, adjust the external control port of the pressure control valve so that the overflow pressure of the pressure control valve is in the set normal working state. The adjustment switching process should be as short as possible to avoid the booster compressor being in a state of collision between the piston and the cylinder for a long time during the transition process.

[0011] When the reciprocating motion of the reducing piston is not required, the external control port of the pressure control valve is adjusted again to keep the overflow pressure of the pressure control valve at the lowest state.

[0012] The booster compressor is set to a maximum interval time. If the interval time is less than the set value, the reciprocating pump is kept on and the overflow pressure of the pressure control valve is kept at the lowest state until the booster compressor is needed again. If the interval time is longer than the set value, the booster compressor is shut down.

[0013] The shutdown sequence of the booster compressor is divided into two situations: if the reciprocating pump has started to work reciprocatingly, cut off the power supply of the reciprocating pump, keep the stable pressure source device turned on, and after a period of time, when the reciprocating pump stops rotating, the stable pressure source device stops working; if the reciprocating pump has not started working: cut off the power supply of the reciprocating pump at the same time and stop the stable pressure source device.

[0014] The beneficial effects of the utility model are:

[0015] 1. It can avoid the internal suction of hydraulic components due to the pump not completely stopping rotation when the machine is shut down, and the situation where the reducing piston hits the cylinder body for a long time during the transition state from static to reciprocating work.

[0016] 2. Reduce the number of shutdowns of the booster compressor, reduce the risk of motor failure, and improve the safety and reliability of the booster compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. 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 any creative work.

[0018] Figure 1 It is a schematic structural diagram of the booster compressor in an embodiment of the present utility model.

[0019] In the figure, 1-pressure control valve, 101-pressure control valve oil inlet, 102-pressure control valve oil outlet, 103-pressure control valve external control port, 2-check valve, 201-check valve oil inlet, 202-check valve oil outlet, 3-air inlet, 4-exhaust port, 5-combined cylinder, 6-variable piston, 7-reciprocating pump, 8-closed hydraulic part, 9-stable pressure source device. DETAILED DESCRIPTION

[0020] The following will be combined with the accompanying 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0021] like Figure 1 As shown, it includes a combined cylinder body 5, in which a variable piston 6 is provided, above the variable piston 6 is a gas chamber, the gas chamber is connected to the air inlet 3 and the exhaust port 4, and below the variable piston 6 is a hydraulic oil chamber, which is connected to a reciprocating pump 7 through a connecting pipe. The pump chamber of the reciprocating pump 7, the hydraulic part of the combined cylinder body 5, and the connecting pipe together constitute a closed hydraulic part 8, which is characterized in that: the closed hydraulic part 8 is connected to a pressure control valve 1 and a one-way valve 2, and the one-way valve 2 replenishes hydraulic oil to the closed hydraulic part 8; the pressure control valve 1 includes a pressure control valve oil inlet 101, a pressure control valve oil outlet 102 and a pressure control valve external control port 103, the hydraulic oil overflowing from the closed hydraulic part 8 enters the pressure control valve 1 through the pressure control valve oil inlet 101 and is discharged through the pressure control valve oil outlet 102, and the pressure control valve external control port 103 controls the overflow pressure of the pressure control valve 1.

[0022] The one-way valve 2 includes a one-way valve oil inlet 201 and a one-way valve oil outlet 202. The one-way valve oil outlet 202 is connected to the closed hydraulic part 8. The one-way valve oil inlet 201 is connected to a stable pressure source device 9.

[0023] Due to the operating characteristics of the compressor, the gas above the variable-diameter piston 6 undergoes four stages in a single cycle: compression, exhaust, expansion, and intake. The gas pressure fluctuates within a single cycle, so the pressure in the closed hydraulic section 8 fluctuates within a certain range.

[0024] The booster compressor start-up and shutdown method employed in the present invention is as follows: Upon startup of the booster compressor, the overflow pressure of the pressure control valve 1 is first minimized by adjusting the external control port 103 of the pressure control valve. The stabilizing pressure source device 9 is then activated. Once the overflow pressure reaches the set pressure, the next step can be performed. The reciprocating pump 7 then begins reciprocating operation. When the variable piston 2 requires reciprocating motion, the overflow pressure of the pressure control valve 1 is maintained at the set normal operating state by adjusting the external control port 103 of the pressure control valve. The switching process is adjusted to be as short as possible to avoid prolonged piston-cylinder collision during the transition. When reciprocating motion of the variable piston 2 is no longer required, the external control port 103 of the pressure control valve is again adjusted to minimize the overflow pressure of the pressure control valve 1. If the booster compressor requires intermittent operation, and the intermittent interval is short, the reciprocating pump 7 can be kept on, with the overflow pressure of the pressure control valve 1 maintained at its lowest level, until the booster compressor is required again. If the intermittent interval is long, or has reached the set maximum interval, the booster compressor can be shut down. When the booster compressor is shut down normally or in an emergency, if the reciprocating pump 7 has started to reciprocate, first cut off the power supply of the reciprocating pump 7, keep the stabilizing pressure source device 9 turned on, and after a period of time, when the reciprocating pump 7 stops rotating, the stabilizing pressure source device 9 stops working. If the reciprocating pump 7 has not started to work, cut off the power supply of the reciprocating pump 7 and stop the stabilizing pressure source device 9 at the same time.

[0025] 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 implementation method 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 implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with this technical field is within the technical scope disclosed by this utility model. For ordinary technicians in this technical field, changes or replacements that can be easily thought of should be included in the protection scope of this utility model without departing from the principle of this utility model. Therefore, the protection scope of the present utility model should be based on the protection scope of the claims.

Claims

1. A booster compressor start-stop device, comprising a combined cylinder (5), a variable-diameter piston (6) provided in the combined cylinder (5), a gas chamber above the variable-diameter piston (6), the gas chamber being connected to an air inlet (3) and an exhaust port (4), a hydraulic oil chamber below the variable-diameter piston (6), the hydraulic oil chamber being connected to a reciprocating pump (7) via a connecting pipe, the pump chamber of the reciprocating pump (7), the hydraulic part of the combined cylinder (5), and the connecting pipe together forming a closed hydraulic part (8), characterized in that: The closed hydraulic part (8) is connected to a pressure control valve (1) and a one-way valve (2), and the one-way valve (2) replenishes hydraulic oil to the closed hydraulic part (8); the pressure control valve (1) includes a pressure control valve oil inlet (101), a pressure control valve oil outlet (102) and a pressure control valve external control port (103), and the hydraulic oil overflowing from the closed hydraulic part (8) enters the pressure control valve (1) through the pressure control valve oil inlet (101) and is discharged through the pressure control valve oil outlet (102), and the pressure control valve external control port (103) controls the overflow pressure of the pressure control valve (1).

2. The booster compressor start-stop device according to claim 1, characterized in that: The one-way valve (2) comprises a one-way valve oil inlet (201) and a one-way valve oil outlet (202), and the one-way valve oil outlet (202) is connected to the closed hydraulic part (8).

3. The booster compressor start-stop device according to claim 2, characterized in that: The one-way valve oil inlet (201) is connected to a stable pressure source device (9).

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