Compressor liquid supplementing system and two-stage compressor

Abstract

The utility model provides a compressor liquid supplementing system and a two-stage compressor. The problems that in the working process of a liquid piston compressor, liquid in an air cylinder is lost, and consequently the working efficiency, safety and reliability of the compressor are reduced are solved. The liquid supplementing execution unit can separate and collect liquid mixed in exhaust gas of the compressor, and the liquid is injected into all stages of air cylinders through liquid sprayers so as to make up for loss of the liquid in the working process of the air cylinders. The liquid supplementing control unit can collect crankshaft phase, pressure in a liquid supplementing pipeline and liquid level data in a gas-liquid separator in real time through a sensor, judges the working state of a compressor, provides parameters such as a liquid supplementing starting point, liquid supplementing duration, liquid supplementing pressure and liquid supplementing amount for the liquid supplementing execution unit, and meanwhile, the liquid supplementing process is fixed to be carried out in the suction stroke. And the liquid is supplemented at a lower and constant liquid supplementing pressure, so that the timing and quantitative accurate control of the liquid supplementing process is realized.

Description

Technical Field

[0001] The present application belongs to the technical field of compressors, and in particular relates to a compressor refilling system and a two-stage compressor. Background Art

[0002] Compared with traditional reciprocating piston compressors, liquid piston compressors use liquid to construct liquid pistons for gas compression. Since liquids are easy to separate, have stable physical and chemical properties under high temperature and high pressure, have extremely low compressibility, excellent lubrication properties, and the solubility of hydrogen in them is extremely low, they can achieve the functions of enhanced heat transfer, liquid sealing, and friction pair lubrication without polluting hydrogen. On the one hand, the compression process is close to an isothermal process, reducing the exhaust temperature of the compressor and saving energy and reducing consumption; on the other hand, it solves the problem of oil-free lubrication and sealing under high pressure of piston machines.

[0003] However, as the piston of a liquid piston compressor continues to reciprocate at high speed, part of the liquid in the cylinder will inevitably be discharged along with the gas during the exhaust phase. The continuous loss of liquid will not only increase the cylinder clearance volume and reduce the compressor volumetric efficiency, but also cause the liquid seal and lubrication between the piston and the cylinder to fail, increasing the risk of gas leakage. Summary of the invention

[0004] The purpose of the present invention is to provide a compressor refilling system and a two-stage compressor, which can efficiently and reasonably replenish liquid into the cylinder to solve the problem of serious liquid loss in the cylinder during the operation of the liquid piston compressor, which affects the working efficiency and safety and reliability of the compressor.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] A compressor rehydration system is mainly composed of a liquid replenishment component, including a rehydration execution unit and a rehydration control unit; the rehydration execution unit is composed of a gas-liquid separator, a pressure reducing valve, and a liquid injector, and is used to inject liquid into cylinders of various stages of the compressor.

[0007] The upper end of the gas-liquid separator is connected to the high-pressure storage tank through a gas pipeline; the bottom outlet of the gas-liquid separator is respectively connected to two pressure reducing valves through a liquid replenishing pipeline, and each pressure reducing valve is connected to a liquid injector through a liquid replenishing pipeline; the liquid injector is installed at the upper end of the cylinder of each stage of the gas compression assembly and is directly connected to the gas compression chamber.

[0008] Preferably, a filter and an exhaust buffer tank are sequentially arranged between the gas-liquid separator and the high-pressure storage tank.

[0009] The rehydration control unit is composed of an electronic control unit, a pressure sensor, a liquid level meter, and a key phase sensor, and is used to collect information such as the pressure in the rehydration pipeline, the liquid level height in the gas-liquid separator, and the piston position, and after processing and calculation, provides the rehydration actuator with parameters such as the rehydration starting point, rehydration duration, rehydration pressure, and rehydration volume to control and achieve a precise rehydration process.

[0010] There are three pressure sensors, which are respectively installed in the first infusion pipeline, the second infusion pipeline and the third infusion pipeline, and are used to measure the pressure in the common infusion pipeline and the two-stage respective infusion pipelines.

[0011] The liquid level meter is installed at the bottom of the gas-liquid separator and is used to detect the liquid level height in the gas-liquid separator.

[0012] The key phase sensor is arranged on the crankcase and installed perpendicularly to the motor rotor shaft, and is used to detect the crankshaft phase, and then determine whether the compressor is in the intake process, compression process, exhaust process or expansion process at this time.

[0013] The pressure sensor, liquid level meter, key phase sensor, liquid injector and pressure reducing valve are all connected to the electronic control unit, which centrally performs data collection, processing, transmission and action control.

[0014] The present invention also provides a two-stage compressor, comprising a first-stage gas compression component and a second-stage gas compression component, and also comprising the above-mentioned liquid replenishment component.

[0015] The primary gas compression assembly is connected to the secondary gas compression assembly via a gas pipeline, the secondary gas compression assembly is connected to the liquid replenishment assembly via a gas pipeline, and the liquid replenishment assembly is connected to the gas compression assembly via a liquid replenishment pipeline.

[0016] When the compressor is in the suction stage, the liquid replenishing component works and the liquid injector replenishes liquid into the cylinder in the form of a jet; when the compressor is in the compression, exhaust and expansion stages, the liquid replenishing component stops working and the liquid injector does not replenish liquid into the cylinder.

[0017] The first-stage gas compression assembly and the second-stage gas compression assembly both include a cylinder, a crankcase, and an inlet and exhaust pipeline. Each cylinder is fixedly connected to the crankcase, and the inner cavity of the cylinder is isolated from the inner cavity of the crankcase by a piston rod filler; the piston is slidably arranged in the cylinder, and a piston seal is arranged between the outer side of the piston and the inner wall of the cylinder; a liquid piston is arranged at the upper end of the piston, and the lower end of the piston is connected to one end of the piston rod, and the other end of the piston rod is connected to the crosshead; the crosshead is slidably arranged in the crankcase, and the crosshead is connected to the crankshaft through a connecting rod; the lower end surface of the piston and the inner wall of the cylinder form an isolation chamber, and the isolation chamber is connected to the isolation chamber drain box through an isolator drain pipeline, which is used to discharge the liquid leaked into the isolation chamber; the intake valve and the exhaust valve are both arranged at the upper end of the cylinder; each stage of gas compression assembly is installed on the same crankshaft, and one end of the crankshaft is connected to the motor.

[0018] Preferably, both the air inlet valve and the exhaust valve are automatic valves, which can open and close automatically by means of the pressure difference between the upper and lower parts of the valve plate.

[0019] The first cylinder of the first-stage gas compression assembly is connected to the low-pressure gas source through a gas pipeline; the first cylinder is connected to one end of the first heat exchanger through a first exhaust valve, and the other end of the first heat exchanger is connected to the second intake valve in the second-stage compression assembly; the second cylinder in the second-stage gas compression assembly is connected to the high-pressure storage tank through a gas pipeline.

[0020] Preferably, an electromagnetic switch valve, an electromagnetic proportional valve, an air intake buffer tank, and a one-way valve are sequentially arranged between the low-pressure air source and the first cylinder.

[0021] The liquid replenishing process of the two-stage compressor provided by the present invention includes a suction stroke, a compression stroke, an exhaust stroke, and an expansion stroke.

[0022] During the intake process, the intake valve opens, the exhaust valve closes, and the electronic control unit detects the crankshaft phase. When the intake process begins, the control injector is opened to inject liquid into the cylinder in the form of a jet to achieve liquid replenishment. After the preset liquid replenishment amount is reached, the injector is closed. If the preset liquid replenishment amount is not reached at the end of the intake process, the injector remains closed and liquid replenishment is performed during the next intake process.

[0023] During the compression stroke, the intake valve is closed, the exhaust valve is closed, and the injector is in the closed state;

[0024] During the exhaust stroke, the intake valve is closed, the exhaust valve is open, and the injector is in the closed state;

[0025] During the expansion stroke, the intake valve is closed, the exhaust valve is closed, and the injector is in a closed state;

[0026] When the fluid replenishment process reaches the preset fluid replenishment volume, the fluid replenishment process ends.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The rehydration execution unit, including the gas-liquid separator, pressure reducing valve, and liquid injector, can separate and collect the liquid mixed in the compressor exhaust, and inject it into the cylinders at all levels through the liquid injector to make up for the loss of liquid in the cylinder during operation. The rehydration control unit, including the electronic control unit, pressure sensor, key phase sensor, and liquid level meter, can collect the crankshaft phase, pressure in the rehydration pipeline, and liquid level data in the gas-liquid separator in real time through sensors to determine the working state of the compressor at this time, and provide the rehydration execution unit with parameters such as the rehydration starting point, rehydration duration, rehydration pressure, and rehydration volume, so as to achieve precise control of the timing and quantity of the rehydration process.

[0029] In addition, the present invention also fixes the rehydration process to the suction process. During the exhaust process, the exhaust valve is opened. If rehydration is performed at this time, the injected ionic liquid will directly flow out through the exhaust valve with the gas, causing liquid waste and affecting the rehydration efficiency. At this time, the pressure in the cylinder reaches a peak value, and the corresponding rehydration pressure of the sprayer also needs to be increased, which consumes a lot of energy. The pressure in the cylinder is constantly changing during the expansion process and the compression process. If rehydration is performed at this time, if the rehydration pressure of the sprayer remains stable, the instantaneous flow rate of the sprayer will continue to change, which is not conducive to the precise control of the rehydration time and amount. During the suction process, the exhaust valve is closed, and the pressure in the cylinder is the suction pressure, which is relatively low and remains stable. At this time, rehydration can be performed at a relatively low and constant rehydration pressure, which is convenient for realizing precise control of rehydration and completing the rehydration process stably and efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of an example of the present invention. Figure 2 This is a close-up view of the cylinder structure in an example of the present invention, taking the first-stage cylinder as an example.

[0031] In the figure, 101-low pressure gas source, 102-electromagnetic switch valve, 103-electromagnetic proportional valve, 104-intake buffer tank, 105-check valve, 106-first intake valve, 107-first exhaust valve, 108-first liquid piston, 109-first piston, 110-first piston seal, 111-first cylinder, 112-first isolation chamber, 113-first filler, 114-first piston rod, 115-first crosshead 116-first connecting rod, 117-first crankcase, 118-crankshaft, 119-first isolation chamber drain box, 120-first heat exchanger, 121-key phase sensor, 122-motor, 206-second intake valve, 207-second exhaust valve, 208-second liquid piston, 209-second piston, 210-second piston seal, 211-second cylinder, 212-second isolation chamber, 213-second filler, 214-second piston rod, 215-second crosshead, 2 16-second connecting rod, 217-second crankcase, 218-second isolation chamber drain box, 219-second heat exchanger, 301-gas-liquid separator, 302-liquid level gauge, 303-filter, 304-exhaust buffer tank, 305-high-pressure storage tank, 306-first liquid replenishment pressure reducing valve, 307-second liquid replenishment pressure reducing valve, 308-first liquid sprayer, 309-second liquid sprayer, 310-first pressure sensor, 311-second pressure sensor, 312- The third pressure sensor, 313-electronic control unit, L1-first gas pipeline, L2-second gas pipeline, L3-third gas pipeline, L4-fourth gas pipeline, L5-fifth gas pipeline, L6-first isolation chamber drainage pipeline, L7-second isolation chamber drainage pipeline, L8-first liquid replenishment pipeline, L9-second liquid replenishment pipeline, L10-third liquid replenishment pipeline, Z1-first gas compression assembly, Z2-secondary gas compression assembly, Z3-liquid replenishment assembly. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings 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 should fall within the scope of protection of the present invention.

[0033] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0034] Example

[0035] like Figure 1 As shown, a compressor rehydration system is mainly composed of a liquid replenishment component Z3, and the liquid replenishment component Z3 includes a rehydration execution unit and a rehydration control unit; the rehydration execution unit is composed of a gas-liquid separator 301, a first rehydration pressure reducing valve 306, a second rehydration pressure reducing valve 307, a first liquid sprayer 308, and a second liquid sprayer 309, which is used to spray liquid into the first cylinder 111 and the second cylinder 211.

[0036] The upper end of the gas-liquid separator 301 is connected to the high-pressure storage tank 305 via a fifth gas pipeline L5.

[0037] Preferably, in some embodiments, the fifth gas pipeline L5 between the upper end of the gas-liquid separator 301 and the high-pressure storage tank 305 is also connected to a filter 303 and an exhaust buffer tank 304 .

[0038] The bottom outlet of the gas-liquid separator 301 is connected to the first liquid replenishment pressure reducing valve 306 and the second liquid replenishment pressure reducing valve 307 respectively through the first liquid replenishment pipeline L8, the first liquid replenishment pressure reducing valve 306 is connected to the first liquid sprayer 308 through the second liquid replenishment pipeline L9, and the second liquid replenishment pressure reducing valve 312 is connected to the second liquid sprayer 309 through the third liquid replenishment pipeline L10. The first liquid sprayer 308 and the second liquid sprayer 309 are respectively installed on the top of the first cylinder 111 and the second cylinder 211, and are directly connected to the gas compression chamber.

[0039] The rehydration control unit is composed of an electronic control unit 313, a first pressure sensor 310, a second pressure sensor 311, a third pressure sensor 312, a liquid level meter 302, and a key phase sensor 121, and is used to collect information on the piston position, the pressure in the rehydration pipeline, and the liquid level height in the gas-liquid separator, and after processing and calculation, provide the rehydration execution unit with parameters such as the rehydration starting point, rehydration duration, rehydration pressure, and rehydration volume to control and achieve a precise rehydration process.

[0040] The liquid level meter 302 is installed at the bottom of the gas-liquid separator 301 and is used to detect the liquid level height in the gas-liquid separator 302 .

[0041] The key phase sensor 121 is arranged on the crankcase 117, and is installed vertically with the rotor shaft of the motor 122, and is used to detect the crankshaft phase. In this embodiment, the gas compression assembly is driven by a crank-connecting rod mechanism, and the crankshaft phase can accurately reflect the piston position, so it can be determined by detecting the crankshaft phase whether the compressor is in the suction process, compression process, exhaust process or expansion process.

[0042] The first pressure sensor 310 is disposed on the first infusion pipeline L8, the second pressure sensor 311 is disposed on the second infusion pipeline L9, and the third pressure sensor 312 is disposed on the third infusion pipeline L10. The pressure sensors are used to measure the pressure in each infusion pipeline.

[0043] The first pressure sensor 310, the second pressure sensor 311, the third pressure sensor 312, the liquid level meter 302, the key phase sensor 121, the first liquid sprayer 308, the second liquid sprayer 309, the first liquid replenishment pressure reducing valve 306, and the second liquid replenishment pressure reducing valve 307 are all connected to the electronic control unit ECU, which uniformly performs data collection, processing, transmission and action control.

[0044] A two-stage compressor comprises a first-stage gas compression component Z1, a second-stage gas compression component Z2, and also comprises the above-mentioned liquid replenishment component Z3.

[0045] The first-stage gas compression component Z1 is connected to the second-stage gas compression component Z2 through the third gas pipeline L3; the second-stage gas compression component Z2 is connected to the liquid replenishment component Z3 through the fourth gas pipeline L4; the liquid replenishment component Z3 is connected to the first-stage gas compression component Z1 and the second-stage gas compression component Z2 through the second liquid replenishment pipeline L9 and the third liquid replenishment pipeline L10 respectively.

[0046] The first-stage gas compression assembly Z1 includes a first cylinder 111, a first crankcase 117, and a first-stage intake and exhaust pipeline. The first cylinder 111 is fixedly connected to the first crankcase 117, and the inner cavity of the cylinder 111 is isolated from the inner cavity of the crankcase 117 by the first filler 113; the first piston 109 is slidably arranged in the first cylinder 111, and a first piston seal 110 is arranged between the outer side surface of the first piston 109 and the inner wall of the cylinder 111; the upper end of the first piston 109 is provided with liquid as the first liquid piston 108, and the lower end of the first piston 109 is connected to one end of the first piston rod 114, and the other end of the first piston rod 114 is connected to the first crosshead 115; the first crosshead 115 is slidably arranged in the first crankcase 117, and the first crosshead 115 is connected to the crankshaft 118 through the first connecting rod 116; the lower end surface of the first piston 109 and the inner wall of the cylinder constitute an isolation chamber, and the isolation chamber is connected to the first isolation chamber drainage box 119 through the first isolator drainage pipeline L6.

[0047] The first cylinder 111 and the low-pressure gas source 101 are connected to the first intake valve 106 through the first intake pipeline L1, and the first intake valve 106 is installed at the intake port of the first cylinder 111; the first exhaust valve 107 is installed at the exhaust port of the first cylinder 111 and is connected to one end of the first heat exchanger 120 through the second gas pipeline L2; the other end of the first heat exchanger 120 is connected to the second intake valve 206 in the secondary gas compression assembly Z2 through the third gas pipeline L3.

[0048] Preferably, in some embodiments, the first air intake pipeline L1 between the low-pressure air source 101 and the first cylinder 111 is provided with an electromagnetic switch valve 102 , an electromagnetic proportional valve 103 , an air intake buffer tank 104 , and a one-way valve 105 in sequence.

[0049] The secondary gas compression assembly Z2 includes a second cylinder 211, a second crankcase 217, and a secondary intake and exhaust pipeline. The second cylinder 211 is fixedly connected to the second crankcase 217, and the inner cavity of the cylinder 211 is isolated from the inner cavity of the crankcase 217 by the second filler 213; the second piston 209 is slidably arranged in the second cylinder 211, and a second piston seal 210 is arranged between the outer side surface of the second piston 209 and the inner wall of the cylinder 211; the upper end of the second piston 209 is provided with liquid as the second liquid piston 208, and the lower end of the second piston 209 is connected to one end of the second piston rod 214, and the other end of the second piston rod 214 is connected to the second crosshead 213; the second crosshead 213 is slidably arranged in the second crankcase 217, and the second crosshead 215 is connected to the second crosshead 213 by the second crosshead 215. The second connecting rod 216 is connected to the crankshaft 118; the lower end surface of the second piston 209 and the inner wall of the cylinder form an isolation chamber, and the isolation chamber is connected to the second isolation chamber drain tank 218 through the second isolator drain pipeline L7; the second intake valve 206 and the second exhaust valve 207 are both installed on the top of the second cylinder 211 and are directly connected to the gas compression chamber; one end of the second intake valve 206 is connected to one end of the first heat exchanger 120 through the third gas pipeline L3; one end of the second exhaust valve 207 is connected to one end of the second heat exchanger 219 through the fourth gas pipeline L4; the other end of the second heat exchanger 219 is connected to one end of the gas-liquid separator 301 through the fourth gas pipeline L4.

[0050] The first crankcase 117 and the second crankcase 217 are connected in series via the same crankshaft 118 , and one end of the crankshaft 118 is connected to the motor 122 .

[0051] Preferably, in some embodiments, the first air intake valve 106, the second air intake valve 206, the first exhaust valve 107, and the second exhaust valve 207 are all automatic valves, which can open and close the valves automatically by means of the pressure difference between the upper and lower parts of the valve plates.

[0052] The liquid replenishing method of the two-stage compressor of the present invention comprises the following process:

[0053] Preparation before gas compression:

[0054] Before the compressor starts running, the valve back pressure of the first liquid replenishment pressure reducing valve 306 and the second liquid replenishment pressure reducing valve 307, the liquid level height threshold of the liquid level meter 302, the opening time and the initial working interval of the first liquid sprayer 308 and the second liquid sprayer 309 are set by the electronic control unit 313 to determine the liquid replenishment starting point, liquid replenishment amount and liquid replenishment pressure of the initial liquid replenishment process; the electromagnetic proportional valve 103 is adjusted to set the intake pressure. At this time, the electromagnetic switch valve 102, the first liquid sprayer 308, the second liquid sprayer 309, the first intake valve 106, the first exhaust valve 107, the second intake valve 206, and the second exhaust valve 207 are all in the closed state.

[0055] Gas compression process: the motor 122 is started, and the first piston 109 and the second piston 209 are driven to reciprocate through the crankshaft 118; the electromagnetic switch valve 102 is opened, and the hydrogen starts from the low-pressure gas source 101, passes through the electromagnetic switch valve 102, the electromagnetic proportional valve 103, the intake buffer tank 104, the check valve 105, and the first intake valve 106 along the first gas pipeline L1 and enters the first cylinder 111; after being pressurized by the first cylinder 111, it enters the first heat exchanger 120 through the first exhaust valve 107 and the second gas pipeline L2; in the first heat exchanger 120, the hydrogen enters the first cylinder 111 through the first exhaust valve 107 and the second gas pipeline L2. After heat exchange in the device 120, it enters the second cylinder 209 along the third gas pipeline L3 through the second intake valve 206 for secondary compression; the compressed high-pressure gas enters the gas-liquid separator 301 along the fourth gas pipeline L4 after heat exchange in the second heat exchanger 219; at this time, the high-pressure gas carrying a certain amount of liquid is separated into gas and liquid in the gas-liquid separator 301, and the separated liquid is retained in the gas-liquid separator 301, and the separated gas enters the high-pressure storage tank 305 along the fifth gas pipeline L5, passes through the filter 303 and the exhaust buffer tank 304 in sequence.

[0056] Fluid rehydration process:

[0057] As the compressor continues to operate, liquid is continuously lost in the first cylinder 111 and the second cylinder 209. When the liquid level meter 302 measures that the liquid level in the gas-liquid separator reaches a preset threshold, the electronic control unit 313 controls the liquid replenishing component Z3 to start the liquid replenishing process in the next piston operation cycle.

[0058] The primary gas compression assembly Z1 and the secondary gas compression assembly Z2 share a crankshaft 118, so the first piston 109 and the second piston 209 operate with a fixed phase difference of 180 degrees. Although there is a phase difference between the two stages, the principle and method of the fluid replenishment process are the same. The fluid replenishment process is described below using the primary gas compression assembly as an example.

[0059] Inhalation process: At this time, the first intake valve 106 is opened, the first exhaust valve 107 is closed, and the electronic control unit 313 detects the start of the intake process through the key phase signal, controls the first liquid sprayer 308 to open, and sprays liquid into the first cylinder 111 at a preset liquid replenishment pressure to achieve liquid replenishment;

[0060] Compression process: the first intake valve 106 is closed, the first exhaust valve 107 is closed, and the first liquid injector 308 is in a closed state under the control of the electronic control unit 313;

[0061] Exhaust process: the first air intake valve 106 is closed, the first exhaust valve 107 is opened, and the first liquid sprayer 308 is in a closed state under the control of the electronic control unit 313;

[0062] Expansion process: the first air inlet valve 106 is closed, the first air outlet valve 107 is closed, and the first liquid injector 308 is in a closed state under the control of the electronic control unit 313;

[0063] When the fluid replenishment process reaches the preset fluid replenishment volume, the fluid replenishment process ends.

[0064] The present invention provides a compressor rehydration system, a two-stage compressor and a rehydration method. Through a rehydration execution unit with a liquid injector as the core, the liquid mixed in the exhaust gas of the compressor can be separated and collected, and injected into each level of cylinders through the liquid injector to make up for the loss of liquid in the cylinder during operation. The rehydration control unit with an electronic control unit as the core can collect the crankshaft phase, the pressure in the rehydration pipeline, and the liquid level data in the gas-liquid separator in real time through sensors to judge the working state of the compressor at this time, and provide the rehydration execution unit with parameters such as the rehydration starting point, rehydration duration, rehydration pressure, and rehydration volume to achieve precise control of the timing and quantity of the rehydration process. At the same time, the present invention fixes the rehydration process to the suction process, and can perform rehydration at a relatively low and constant rehydration pressure, which is convenient for realizing precise control of rehydration and stably and efficiently completing the rehydration process. The present invention solves the problem that the loss of liquid in the cylinder during the operation of the liquid piston compressor causes the compressor to reduce its working efficiency and safety reliability.

Claims

1. A compressor refilling system, mainly composed of a liquid replenishing component (Z3), including a refilling execution unit and a refilling control unit; the refilling execution unit is composed of a gas-liquid separator (301), two refilling pressure reducing valves (306, 307), and two liquid sprayers (308, 309); the upper end of the gas-liquid separator (301) is connected to a high-pressure storage tank (305) through a fifth gas pipeline (L5); the bottom outlet is connected to the two refilling pressure reducing valves (306, 307) through a first refilling pipeline (L8) in turn, and then connected to the two liquid sprayers (308, 309) through second and third refilling pipelines (L9, L10); the two liquid sprayers (308, 309) are respectively installed on the top of two cylinders of the compressor and are directly connected to the gas compression chamber; It is characterized in that The liquid replenishment control unit is composed of an electronic control unit (313), three pressure sensors (310, 311, 312), a liquid level meter (302), and a key phase sensor (121); Three pressure sensors (310, 311, 312) are respectively arranged on the first, second and third infusion pipelines (L8, L9, L10) for measuring the pressure in each pipeline; A liquid level meter (302) is installed at the bottom of the gas-liquid separator (301) to detect the liquid level; The key phase sensor (121) is arranged on the crankcase of the compressor and is installed vertically with the rotor shaft of the compressor motor to detect the crankshaft phase and thus know the piston position of the compressor; The three pressure sensors (310, 311, 312), the liquid level meter (302), the key phase sensor (121), the two liquid sprayers (308, 309), and the two liquid replenishment pressure reducing valves (306, 307) are all connected to the electronic control unit (313), and the electronic control unit (313) uniformly performs data collection, processing, transmission and action control.

2. The compressor fluid replenishment system according to claim 1, characterized in that: A filter (303) and an exhaust buffer tank (304) are also provided in sequence on the fifth gas pipeline (L5) between the upper end of the gas-liquid separator (301) and the high-pressure storage tank (305).

3. A two-stage compressor, comprising a first-stage gas compression component (Z1) and a second-stage gas compression component (Z2), characterized in that: It also includes a compressor replenishment system as described in claim 1 or 2, wherein the first-stage gas compression component (Z1) is connected to the second-stage gas compression component (Z2) through a third gas pipeline (L3), the second-stage gas compression component (Z2) is connected to the liquid replenishment component (Z3) through a fourth gas pipeline (L4), and the liquid replenishment component (Z3) is connected to the first-stage gas compression component (Z1) and the second-stage gas compression component (Z2) through a second replenishment pipeline (L9) and a third replenishment pipeline (L10), respectively.

4. The two-stage compressor according to claim 3, characterized in that The first-stage gas compression assembly (Z1) comprises a first cylinder (111), a first crankcase (117), and a first-stage intake and exhaust pipeline; the first cylinder (111) is fixedly connected to the first crankcase (117); and the inner cavity of the cylinder (111) is isolated from the inner cavity of the crankcase (117) by a first filler (113); The first piston (109) is slidably disposed in the first cylinder (111), a first piston seal (110) is disposed between the outer side surface and the inner wall of the cylinder (111), a first liquid piston (108) is disposed at the upper end, and the lower end is connected to one end of the first piston rod (114), the other end of the first piston rod (114) is connected to the first crosshead (115), the first crosshead (115) is slidably disposed in the first crankcase (117), and is connected to the crankshaft (118) through the first connecting rod (116), the lower end surface of the first piston (109) and the inner wall of the cylinder form an isolation chamber, the isolation chamber is connected to the first isolation chamber drainage box (119) through the first isolator drainage pipeline (L6), and is used to discharge liquid leaked into the isolation chamber; The structural composition of the secondary gas compression component (Z2) is the same as that of the primary gas compression component (Z1); The intake valve (106, 206) and the exhaust valve (107, 207) of the two-stage gas compression assembly (Z1, Z2) are both arranged at the upper end of the cylinder (111, 211), and the two crankcases (117, 217) are connected in series by the same crankshaft (118), and one end of the crankshaft (118) is connected to the motor (122); The first cylinder (111) of the first-stage gas compression component (Z1) is connected to the low-pressure gas source (101) via a first intake pipeline (L1); the first intake valve (106) is installed at the intake port of the first cylinder (111); the first exhaust valve (107) is installed at the exhaust port of the first cylinder (111) and is connected to the first heat exchanger (120) via a second gas pipeline (L2) in sequence, and then connected to the second intake valve (206) in the second-stage gas compression component (Z2) via a third gas pipeline (L3); one end of the second exhaust valve (207) is connected to the second heat exchanger (219) and the gas-liquid separator (301) in sequence via a fourth gas pipeline (L4).

5. The two-stage compressor according to claim 4, characterized in that An electromagnetic switch valve (102), an electromagnetic proportional valve (103), an air intake buffer tank (104), and a one-way valve (105) are sequentially arranged on the first air intake pipeline (L1) between the first air cylinder (111) and the low-pressure air source (101).

6. The two-stage compressor according to claim 4 or 5, characterized in that: The two air inlet valves (106, 206) and the two air exhaust valves (107, 207) are all automatic valves, and the automatic opening and closing of the valves is achieved by relying on the pressure difference between the upper and lower parts of the valve plates.

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