Safety liquid injection device and liquid injection screw compressor system

Abstract

A safe liquid spray device comprises a shell, an inner core and an elastic element; the shell has an inner cavity, and the inner cavity has a liquid spray inlet, a main liquid spray outlet, an auxiliary liquid spray outlet and a pressure-leading interface; the inner core and the elastic element are respectively arranged in the inner cavity, one end of the elastic element is fixed, and the other end abuts against one end of the inner core, and the other end of the inner core faces the pressure-leading interface; the inner core blocks the auxiliary liquid spray outlet under normal conditions, and connects the liquid spray inlet with the main liquid spray outlet; when the pressure applied to the inner core by the medium input to the pressure-leading interface is greater than the elastic force applied to the inner core by the elastic element, the inner core moves so that the liquid spray inlet is connected to the main liquid spray outlet and the auxiliary liquid spray outlet at the same time. The present invention also discloses a liquid spray screw compressor system using the above-mentioned safe liquid spray device. The present invention can reduce the risk of being unable to spray liquid due to clogging of the atomizing nozzle of the compressor.

Description

Technical Field

[0001] The present invention relates to process gas screw compressor technology. Background Art

[0002] The female and male rotors of the process gas screw compressor are driven by synchronous gears, and there is no contact between the two rotor profile surfaces. During operation, the sealed cavity formed by the female, male and shell forms a low-leakage seal with a very small gap. The small gap between the female and male rotors and the shell of the screw compressor determines that the temperature rise during the compression of the medium cannot be too large, so as to prevent the rotor from expanding due to heat, causing contact and friction between the female and male rotors or between the rotor and the shell, resulting in damage to the compressor. In order to apply the screw compressor to process flows with higher pressure ratios and give full play to the advantages of the equipment, most process gas screw compressors are operated by liquid injection. On the one hand, it can control the temperature rise during the compression process and prevent damage to the unit. On the other hand, it can improve the gap sealing effect and improve the volumetric efficiency.

[0003] At present, the main forms of liquid spraying devices at the inlet of the compressor include atomizing nozzles or drilling holes on the inlet short circuit at the suction end, and introducing a straight liquid spraying pipe with multiple small holes drilled on the pipe wall. The liquid spraying medium is sprayed out through the atomizing nozzle, or flows into the straight liquid spraying pipe, and then sprayed into the compressor through multiple small holes on the wall of the straight liquid spraying pipe. The sprayed liquid and the medium gas are mixed at the inlet of the compressor and enter the working chamber of the compressor for compression.

[0004] In order to ensure the atomization effect of the liquid spraying device, the diameter of the liquid spraying hole should not be too large, so as to improve the mixing degree of the inlet liquid phase and the gas phase, thereby improving the cooling effect and sealing effect of the liquid spraying medium. However, due to the small diameter of the liquid spraying hole of the atomizing nozzle or the straight liquid spraying pipe, it is easy for the atomizing nozzle or the straight liquid spraying pipe to be blocked during the operation of the unit. If the atomizing nozzle or the straight liquid spraying pipe is blocked and the liquid spraying stops, it is easy to cause the rotor to expand due to heat, resulting in the rotor and the shell being stuck. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a safe liquid injection device that can be used at the inlet of a process gas screw compressor, which can reduce the risk of liquid injection failure due to blockage of the compressor's atomizing nozzle, and ensure stable and efficient operation of the process gas liquid injection screw compressor.

[0006] Another technical problem to be solved by the present invention is to provide a liquid injection screw compressor system.

[0007] The invention provides a safe liquid spraying device, comprising a shell, an inner core and an elastic element; the shell has an inner cavity, and the inner cavity has a liquid spraying inlet, a main liquid spraying outlet, an auxiliary liquid spraying outlet and a pressure-leading interface; the inner core and the elastic element are respectively arranged in the inner cavity, one end of the elastic element is fixed, the other end of the elastic element abuts against one end of the inner core, and the other end of the inner core faces the pressure-leading interface; the inner core blocks the auxiliary liquid spraying outlet under normal conditions, and connects the liquid spraying inlet with the main liquid spraying outlet; when the pressure applied to the inner core by the medium input to the pressure-leading interface is greater than the elastic force applied to the inner core by the elastic element, the inner core moves, so that the liquid spraying inlet is connected to the main liquid spraying outlet and the auxiliary liquid spraying outlet at the same time.

[0008] The present invention also provides a liquid-spraying screw compressor system, comprising a compressor body, an inlet pipeline connected to the air inlet of the compressor body, an exhaust pipeline connected to the exhaust port of the compressor body, an inlet liquid spray pipeline, the aforementioned safety liquid spray device, a main atomizing nozzle, an auxiliary atomizing nozzle and a drainage pipe; the liquid spray inlet of the safety liquid spray device is connected to the inlet liquid spray pipeline, the main liquid spray outlet of the safety liquid spray device is connected to the main atomizing nozzle through a first pipeline, the auxiliary liquid spray outlet of the safety liquid spray device is connected to the auxiliary atomizing nozzle through a second pipeline, and the main atomizing nozzle and the auxiliary atomizing nozzle are respectively extended into the inlet pipeline; one end of the drainage pipe is connected to the inlet liquid spray pipeline, and the other end of the drainage pipe is connected to the pressure inlet interface of the safety liquid spray device.

[0009] The present invention has at least the following advantages:

[0010] The safe liquid spraying device of the embodiment of the present invention is provided with a pressure-inducing interface and two liquid spraying outlets. In actual use, the pressure-inducing interface is connected to the liquid spraying pipeline of the compressor, and the two liquid spraying outlets are respectively connected to two atomizing nozzles. Under normal conditions, only one liquid spraying outlet is connected to the liquid spraying inlet. Once the atomizing nozzle connected to the liquid spraying outlet is blocked, the pressure applied to the inner core by the medium input to the pressure-inducing interface will be greater than the elastic force applied to the inner core by the elastic element, so that the other liquid spraying outlet also forms a fluid connection with the liquid spraying inlet. Accordingly, the atomizing nozzle connected to the other liquid spraying outlet starts to spray liquid, thereby avoiding the situation where the liquid spraying stops due to the blockage of one atomizing nozzle, and ensuring that the process gas liquid spraying screw compressor can operate stably and efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A cross-sectional schematic diagram of a safety liquid spraying device according to an embodiment of the present invention is shown, wherein the inner core of the safety liquid spraying device is in a normal state.

[0012] Figure 2 The overall structural schematic diagram of a liquid injection screw compressor system using a safe liquid injection device according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0013] The present invention will be further described below in conjunction with the accompanying drawings.

[0014] Figure 1 FIG. 2 shows a cross-sectional schematic diagram of a safety liquid spraying device according to an embodiment of the present invention. Figure 1 The safety liquid spraying device 100 according to the embodiment of the present invention includes a housing 11 , an inner core 12 and an elastic element 13 .

[0015] The housing 11 has an inner cavity 10 , and the inner cavity 10 has a liquid spray inlet 101 , a main liquid spray outlet 102 , an auxiliary liquid spray outlet 103 and a pressure-inducing interface 104 .

[0016] The inner core 12 and the elastic element 13 are respectively arranged in the inner cavity 10 , one end of the elastic element 13 is fixed, the other end of the elastic element 13 abuts against one end of the inner core 12 , and the other end of the inner core 12 faces the pressure-introducing interface 104 .

[0017] In this embodiment, the liquid injection inlet 101, the main liquid injection outlet 102 and the auxiliary liquid injection outlet 103 are respectively arranged on the side wall 11a of the housing 11, the liquid injection inlet 101 is located on the first side of the housing side wall, the main liquid injection outlet 102 and the auxiliary liquid injection outlet 103 are located on the second side of the housing side wall, and the second side is opposite to the first side. The pressure-introducing interface 104 is arranged on the end wall 11b at one end of the housing. One end of the elastic element 13 is connected to the end wall 11c at the other end of the housing.

[0018] Optionally, an end surface of one end of the inner core 12 and the shell together define an elastic element cavity 10a, and the elastic element 13 is disposed in the elastic element cavity 10a.

[0019] Optionally, the elastic element 13 is a spring. The shell 11 and the inner core 12 are both cylindrical.

[0020] Furthermore, a first annular groove 111 and a second annular groove 112 are formed on the inner surface of the side wall of the shell 11 ; the main liquid spray outlet 102 passes through the bottom surface of the first annular groove 111 , and the auxiliary liquid spray outlet 103 passes through the bottom surface of the second annular groove 112 .

[0021] In this embodiment, a third annular groove 123 is provided on the side of the inner core 12, and the liquid injection inlet 101 and the main liquid injection outlet 102 are respectively opposite to the third annular groove 123 when the inner core 12 is in a normal state, so that the liquid injection inlet 101 and the main liquid injection outlet 102 are in fluid communication, that is, the fluid flowing in from the liquid injection inlet 101 can flow into the main liquid injection outlet 102 through the third annular groove 123. On the other hand, the inner core 12 blocks the auxiliary liquid injection outlet 103 in a normal state, so that the fluid flowing in from the liquid injection inlet 101 will not flow into the auxiliary liquid injection outlet 103.

[0022] Figure 2FIG. 2 shows an overall structural diagram of a liquid injection screw compressor system using a safety liquid injection device 100 according to an embodiment of the present invention. Figure 2 As shown, the liquid injection screw compressor system includes a compressor body 21, an inlet pipeline 22 connected to the air inlet of the compressor body 21, an exhaust pipeline 23 connected to the exhaust port of the compressor body 21, an inlet liquid injection pipeline 24 connected to the inlet pipeline 22, a main atomizing nozzle 25, an auxiliary atomizing nozzle 26, a drainage pipe 27, the aforementioned safety liquid injection device 100, a temperature transmitter 20 and a control device 300.

[0023] The liquid spray inlet 101 of the safety liquid spray device 100 is connected to the liquid spray inlet pipeline 24, the main liquid spray outlet 102 of the safety liquid spray device 100 is connected to the main atomizing nozzle 25 through the first pipeline 281, and the auxiliary liquid spray outlet 103 of the safety liquid spray device 100 is connected to the auxiliary atomizing nozzle 26 through the second pipeline 282. The main atomizing nozzle 25 and the auxiliary atomizing nozzle 26 extend into the inlet pipeline 22 respectively. One end of the drainage pipe 27 is connected to the liquid spray inlet pipeline 24, and the other end of the drainage pipe 27 is connected to the pressure inlet interface 104 of the safety liquid spray device 100.

[0024] In this embodiment, an inlet liquid spray valve group 29 is provided on the inlet liquid spray pipeline 24 to adjust the flow rate of the inlet liquid spray. During the operation of the compressor body 21, in order to prevent the compressor rotor from biting with the inner wall of the shell due to excessive gas phase temperature, liquid is sprayed into the inlet pipeline 22 through the inlet liquid spray pipeline 24, which can not only cool the rotor, but also seal the compressor.

[0025] The temperature transmitter is arranged on the exhaust pipe 23 ; the output end of the temperature transmitter 20 is connected to the input end of the control device 300 , and the output end of the control device 300 is connected to the control input end of the inlet liquid injection valve group 29 .

[0026] The medium gas enters the compressor body 21 through the inlet pipeline 22, and the liquid spraying medium enters the main atomizing nozzle 25 through the inlet liquid spraying valve group 29 and the safety liquid spraying device 100. The inlet liquid spraying medium and the medium gas are mixed in the inlet pipeline 22, and then enter the cavity of the compressor body 21 for compression. The temperature transmitter 20 outputs the temperature signal to the control device 300, and the control device 300 adjusts the valve opening of the inlet liquid spraying valve group 29 according to the temperature measurement value to maintain the constant outlet temperature of the compressor body. The control device 300 can adopt a PLC controller.

[0027] When the main atomizing nozzle 25 is clogged, the amount of liquid sprayed is reduced, the outlet temperature of the compressor body increases, the opening of the liquid spray valve group 29 increases, and the pressure in the inlet liquid spray pipeline 24 increases. Under normal circumstances (normal conditions), when the force on the inner core 12 reaches equilibrium, the inner core 12 stabilizes in the right position in the shell 11, the main liquid spray outlet 102 is connected to the main atomizing nozzle 25, and the inner core 12 blocks the auxiliary liquid spray outlet 103. When the main atomizing nozzle 25 is clogged, the pressure in the inlet liquid spray pipeline 24 increases, and the liquid spray medium enters the inner cavity 10 of the shell from the pressure inlet interface 104, causing the pressure applied to the inner core 12 by the medium input to the pressure inlet interface to be greater than the elastic force applied to the inner core 12 by the elastic element 13, pushing the inner core 12 to move to the left, so that the liquid spray inlet 101 is connected to the main liquid spray outlet 102 and the auxiliary liquid spray outlet 103 at the same time. The liquid spray medium flowing out of the auxiliary liquid spray outlet 103 enters the auxiliary atomizing nozzle 26, so that the liquid spraying continues and will not be interrupted due to the blockage of the main atomizing nozzle 25, thereby ensuring that the outlet temperature of the compressor body remains constant. Under extreme working conditions, even if the main atomizing nozzle 25 is completely blocked, the existence of the safety liquid spraying device can ensure the normal operation of the screw compressor and the liquid spraying will not be interrupted. According to the indication of the pressure gauge 4, it can be judged whether the main atomizing nozzle 25 is blocked, so as to replace the atomizing nozzle in time. The pressure gauge 4 is used to detect the medium pressure in the drainage pipe 27.

[0028] The above description is only a preferred embodiment of the invention and is not intended to limit the invention. Although the invention is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the invention shall be included in the protection scope of the invention.

Claims

1. A liquid injection screw compressor system, comprising a compressor body, an inlet pipeline connected to an air inlet of the compressor body, an exhaust pipeline connected to an exhaust port of the compressor body, and an inlet liquid injection pipeline, characterized in that: The liquid injection screw compressor system also includes a safety liquid injection device, a main atomizing nozzle, an auxiliary atomizing nozzle and a drainage pipe; The safety liquid spraying device comprises a shell, an inner core and an elastic element; the shell has an inner cavity, and the inner cavity has a liquid spraying inlet, a main liquid spraying outlet, an auxiliary liquid spraying outlet and a pressure-inducing interface; the inner core and the elastic element are respectively arranged in the inner cavity, one end of the elastic element is fixed, the other end of the elastic element abuts against one end of the inner core, and the other end of the inner core faces the pressure-inducing interface; The inner core blocks the auxiliary liquid spray outlet under normal conditions and connects the liquid spray inlet with the main liquid spray outlet; when the pressure applied to the inner core by the medium input to the pressure-inducing interface is greater than the elastic force applied to the inner core by the elastic element, the inner core moves so that the liquid spray inlet is connected to both the main liquid spray outlet and the auxiliary liquid spray outlet; The liquid spray inlet of the safety liquid spray device is connected to the inlet liquid spray pipeline, the main liquid spray outlet of the safety liquid spray device is connected to the main atomizing nozzle through a first pipeline, and the auxiliary liquid spray outlet of the safety liquid spray device is connected to the auxiliary atomizing nozzle through a second pipeline, and the main atomizing nozzle and the auxiliary atomizing nozzle extend into the inlet pipeline respectively; One end of the drainage pipe is connected to the inlet liquid spray pipeline, and the other end of the drainage pipe is connected to the pressure-introducing interface of the safety liquid spray device.

2. The liquid injection screw compressor system according to claim 1, characterized in that: The liquid injection screw compressor system comprises an inlet liquid injection valve group, a temperature transmitter and a control device, wherein the inlet liquid injection valve group is arranged on the inlet liquid injection pipeline, and the temperature transmitter is arranged on the exhaust pipeline; The output end of the temperature transmitter is connected to the input end of the control device, and the output end of the control device is connected to the control input end of the inlet liquid spray valve group.

3. The liquid injection screw compressor system according to claim 1, characterized in that: The liquid spray inlet, the main liquid spray outlet and the auxiliary liquid spray outlet are respectively arranged on the side wall of the shell, the liquid spray inlet is located on the first side of the shell, the main liquid spray outlet and the auxiliary liquid spray outlet are located on the second side of the shell side wall, and the second side is opposite to the first side; The pressure-introducing interface is arranged on an end wall at one end of the housing.

4. The liquid injection screw compressor system according to claim 3, characterized in that: One end of the elastic element is connected to the end wall of the other end of the shell.

5. The liquid injection screw compressor system according to claim 1 or 4, characterized in that: The elastic element is a spring.

6. The liquid injection screw compressor system according to claim 3, characterized in that: The inner surface of the side wall of the shell is provided with a first annular groove and a second annular groove; The main liquid spray outlet passes through the bottom surface of the first annular groove, and the auxiliary liquid spray outlet passes through the bottom surface of the second annular groove.

7. The liquid-injected screw compressor system according to claim 1, wherein: The shell and the inner core are both cylindrical.

8. The liquid injection screw compressor system according to claim 1 or 7, characterized in that: A third annular groove is provided on the side surface of the inner core, and the liquid spray inlet and the main liquid spray outlet are respectively opposite to the third annular groove when the inner core is in the normal state.

9. The liquid injection screw compressor system according to claim 1, characterized in that: An end surface of one end of the inner core and the shell together define an elastic element cavity, and the elastic element is arranged in the elastic element cavity.

Images