System for preventing machine head from being soaked in water for oil injection screw compressor

Abstract

The utility model provides a system for preventing a machine head from being soaked in water for an oil injection screw compressor, and relates to the technical field of structural design of oil injection screw compressors, and the system comprises a temperature sensor, a drainage pipe, an electromagnetic valve and a control unit. The temperature sensor is used for being arranged on the outer wall of an oil-gas separator of the oil injection screw compressor; one end of the drainage pipe is communicated with an inner cavity of the oil-gas separator, the other end of the drainage pipe is communicated with the outside, and the electromagnetic valve is arranged on the drainage pipe and used for controlling on-off of the drainage pipe; the control unit is electrically connected with the temperature sensor and the electromagnetic valve. According to the system for preventing the machine head from being soaked in water for the oil injection screw compressor, the phenomenon that liquid water is accumulated in the oil-gas separator can be effectively prevented, so that the problem that the machine head or a bearing is rusted or fails due to being soaked in water can be effectively avoided; therefore, serious production faults such as machine head jamming, motor overload and dead halt can be effectively avoided.

Description

Technical Field

[0001] The present application relates to the technical field of structural design of oil-injected screw compressors, and in particular to a system for preventing a machine head from being soaked in water for an oil-injected screw compressor. Background Art

[0002] Oil-injected screw compressors have been rapidly and widely developed in the field of industrial production due to their high reliability, simple and convenient operation and maintenance, good power balance, strong adaptability and multi-phase mixed transmission.

[0003] In actual application, oil-injected screw compressors are often in intermittent air supply conditions. In intermittent air supply conditions, the oil-gas separator of the oil-injected screw compressor will be in a shutdown state. If the shutdown time is long (that is, the time interval of the intermittent air supply is long), the oil-gas separator will continue to exchange heat with the surrounding environment, which will cause the temperature in the oil-gas separator to drop, and then cause liquid water to precipitate and accumulate in the oil-gas separator.

[0004] In this way, the following problems will arise: as the oil-injected screw compressor continues to run, the liquid water in the oil-gas separator will accumulate more and more, and the liquid level of the lubricating oil in the oil-gas separator will be raised and discharged with the compressed air (or the lubricating oil and liquid water are mixed and emulsified), resulting in excessive liquid water in the oil-gas separator, causing the machine head or bearings to rust (or fail) due to soaking in water, and then there may be serious production failures such as machine head jamming, motor overload and crash. Utility Model Content

[0005] In order to solve the technical problems in the related art, the present application provides a system for preventing the head from being soaked in water for an oil-injected screw compressor. The system for preventing the head from being soaked in water for an oil-injected screw compressor of the present application can effectively prevent the accumulation of liquid water in the oil-gas separator, thereby effectively preventing the head or bearing from rusting (or failing) due to soaking in water, and further effectively preventing serious production failures such as head jamming, motor overload and crash.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted in this application is: a system for preventing the head from being soaked in water for an oil-injected screw compressor, comprising:

[0007] A temperature sensor is used to be arranged on the outer wall of the oil-gas separator of the oil-injected screw compressor;

[0008] A drain pipe and a solenoid valve, one end of the drain pipe is used to communicate with the inner cavity of the oil-gas separator, and the other end of the drain pipe is used to communicate with the outside world, and the solenoid valve is arranged on the drain pipe to control the on and off of the drain pipe;

[0009] The control unit is electrically connected to the temperature sensor and the solenoid valve respectively.

[0010] Optionally, one end of the drain pipe is used to connect to the exhaust pipe of the safety valve of the oil-gas separator, and the solenoid valve is configured as a two-position two-way solenoid valve, wherein one position and one way is normally open and used to connect to the safety valve, and the other position and one way is normally closed and used to connect to the outside world.

[0011] Optionally, the control unit includes a data acquisition module, a discrimination module and a signal sending module; the data acquisition module is used to acquire temperature data of the temperature sensor, the discrimination module is used to determine whether the temperature data of the temperature sensor is greater than a temperature threshold, and the signal sending module is used to send a conduction signal to the solenoid valve.

[0012] Optionally, the temperature threshold is set to 70°C-80°C.

[0013] Optionally, the signal sending module is further used to send a cut-off signal to the solenoid valve, and there is a time difference between the conduction signal and the cut-off signal.

[0014] Optionally, the time difference is set to 50s-70s.

[0015] Optionally, the drain pipe includes a first pipe, a second pipe and a third pipe, one end of the first pipe is used to communicate with the inner cavity of the oil-gas separator, the other end of the first pipe is respectively connected with the second pipe and the third pipe, a safety valve is arranged on the second pipe, and the solenoid valve is arranged on the third pipe.

[0016] Beneficial effects:

[0017] 1. Through the above technical scheme, the temperature sensor arranged on the outer wall of the oil-gas separator in the present application can obtain the temperature of the oil-gas separator. After the temperature of the oil-gas separator drops to a certain level, the solenoid valve can be opened by the control unit to discharge all the mixed gases in the oil-gas separator, thereby effectively avoiding the appearance of liquid water in the oil-gas separator, and further effectively avoiding the problem of rust (or invalidity) of the machine head or bearings due to soaking in water, and also effectively avoiding serious production failures such as machine head jamming, motor overload or crash.

[0018] 2. Other beneficial effects or advantages of the present application will be described in detail in conjunction with the specific structure in the specific implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative labor. In addition, it should be understood that the proportional relationship of the various components in the drawings of this specification does not represent the proportional relationship in the actual material selection and design, which is only a schematic diagram of the structure or position, where:

[0020] Figure 1 It is a schematic diagram of the structure of an oil-injected screw compressor;

[0021] Figure 2 1 is a schematic diagram of the structural arrangement of a system for preventing a head from being soaked in water for an oil-injected screw compressor provided by an exemplary embodiment of the present application, wherein an oil-gas separator and a safety valve are also shown;

[0022] Figure 3 It is a schematic diagram of the structural arrangement of a control unit provided by an exemplary embodiment of the present application, wherein a temperature sensor, a solenoid valve and an oil-gas separator are also shown.

[0023] Description of the reference numerals in the accompanying drawings:

[0024] 100-oil-injected screw compressor; 101-air filter; 102-intake valve; 103-screw rotor; 104-check valve; 105-oil-gas separator; 1051-safety valve; 106-minimum pressure valve; 107-aftercooler; 108-oil cooler; 109-temperature regulating bypass valve; 110-oil filter; 111-oil cut-off valve; 112-manual drain valve; 1-temperature sensor; 2-drain pipe; 21-first pipeline; 22-second pipeline; 23-third pipeline; 3-solenoid valve; 4-control unit; 41-data acquisition module; 42-discrimination module; 43-signal sending module. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0027] To facilitate understanding by relevant technical personnel, the technical problems existing in the existing related technologies are described in more detail below.

[0028] In actual application, the gas demand of the gas-using end of the oil-injected screw compressor (whether fixed frequency or variable frequency) often changes periodically (or is unstable). For example, after the oil-injected screw compressor supplies gas normally for the first time period (for example, 10 minutes), the gas-using end no longer needs compressed air. At this time, the oil-injected screw compressor will shut down for the second time period (for example, 10 minutes to 20 minutes); as the production process proceeds, the gas-using end may need compressed air again. At this time, the oil-injected screw compressor will start and supply gas for the third time period (for example, 15 minutes). It can be understood that the first time period, the second time period and the third time period are not fixed times, and their actual values ​​change with the changes in the gas-using end's demand.

[0029] During this process, the oil-injected screw compressor is in a running-stop-run-stop working state, which will cause the oil-gas separator to sometimes run normally and sometimes stop running. In the oil-gas separator, the interior is filled with a relatively high temperature and 100% humidity oil-gas mixture (its components include air, water vapor and a certain amount of oil mist). In this way, during the period when the oil-gas separator stops running, the oil-gas mixture inside it will exchange heat with the outside air through the outer wall of the oil-gas separator, causing the temperature inside to drop, and the water vapor in the oil-gas mixture will turn into liquid water and accumulate in the oil-gas separator.

[0030] However, the oil-gas separator cannot discharge this liquid water during normal operation. When the oil-gas separator continues to work for a period of time (that is, the oil-gas separator sometimes operates normally and sometimes stops operating, after a period of time), the liquid water in the oil-gas separator will accumulate more and more, and the liquid level of the lubricating oil in the oil-gas separator will be raised and discharged with the compressed air, or the lubricating oil will mix with the accumulated liquid water and emulsify.

[0031] At this time, there will be too much liquid water in the oil-gas separator, causing the machine head or bearing to rust due to soaking in water. At the same time, too little lubricating oil (or emulsification) will cause the bearing to fail due to lack of sufficient lubricating oil, which will lead to serious production failures such as machine head jamming, motor overload or crash.

[0032] In view of this, the present application provides a brand-new solution, namely, a system for preventing the head from being soaked in water for an oil-injected screw compressor, so as to prevent the accumulation of liquid water in the oil-gas separator, thereby effectively avoiding the problem of rust (or failure) of the head or bearing due to soaking in water, and further effectively avoiding serious production failures such as head jamming, motor overload and crash.

[0033] To facilitate the understanding of relevant technical personnel, the following is a brief introduction to the structure of the existing oil-injected screw compressor. Figure 1 The existing oil-injected screw compressor generally includes an air filter 101, an air intake valve 102, a screw rotor 103, a check valve 104, an oil-gas separator 105 (on which a safety valve 1051 is arranged), a minimum pressure valve 106, an aftercooler 107, an oil cooler 108, a temperature regulating bypass valve 109, an oil filter 110, an oil cut-off valve 111, and a manual drain valve 112. Since the oil-injected screw compressor is widely used in the prior art, the present application will not elaborate on its working process and specific principle.

[0034] The technical solution of the present application is described in detail below with reference to the accompanying drawings.

[0035] Example 1

[0036] like Figures 1 to 3 As shown, this embodiment provides a system for preventing the head from being soaked in water for an oil-injected screw compressor, comprising a temperature sensor 1, a drain pipe 2, a solenoid valve 3 and a control unit 4. The temperature sensor 1 is used to be arranged on the outer wall of the oil-gas separator 105 of the oil-injected screw compressor 100; one end of the drain pipe 2 is used to communicate with the inner cavity of the oil-gas separator 105, and the other end of the drain pipe 2 is used to communicate with the outside world, and the solenoid valve 3 is arranged on the drain pipe 2 to control the on and off of the drain pipe 2; the control unit 4 is electrically connected to the temperature sensor 1 and the solenoid valve 3 respectively.

[0037] Through the above technical scheme, the temperature sensor 1 arranged on the outer wall of the oil-gas separator 105 of the present application can obtain the temperature of the oil-gas separator 105. After the temperature of the oil-gas separator 105 is reduced to a certain level, the solenoid valve 3 can be opened by the control unit 4 to discharge all the mixed gases in the oil-gas separator 105, thereby effectively avoiding the appearance of liquid water in the oil-gas separator 105, and further effectively avoiding the problem of rust (or invalidity) of the machine head or bearings due to soaking in water, and also effectively avoiding serious production failures such as machine head jamming, motor overload or crash.

[0038] In the above-mentioned embodiment, it should be noted that, first, the temperature sensor 1 of the present application is directly arranged on the outer wall of the oil-gas separator 105, so as to indirectly monitor the temperature inside the oil-gas separator 105, which can not only quickly and effectively obtain relevant temperature data, but also avoid opening holes inside the oil-gas separator 105, installing the temperature sensor 1, and other operations that affect the structural integrity and shell rigidity of the oil-gas separator 105.

[0039] Second, the head water prevention system for the oil-injected screw compressor of the present application has a simple structure, and the changes and impacts on the existing oil-injected screw compressor 100 are very small, and can be easily implemented in the existing oil-injected screw compressor 100 through simple modification.

[0040] To facilitate understanding by relevant technical personnel, the working process / working principle of the above implementation method is explained below.

[0041] When the oil-injected screw compressor 100 is shut down, if the surface temperature of the oil-gas separator 105 obtained by the temperature sensor 1 drops to a certain value (the value can be set according to actual conditions, for example, it can be set to 75°C, 80°C, etc.), the control unit 4 sends an opening signal to the solenoid valve 3, the solenoid valve 3 is opened, and all the mixed gas in the oil-gas separator 105 will be completely discharged through the drain pipe 2. In this way, the problem of liquid water accumulation in the oil-gas separator 105 caused by the long-term shutdown of the oil-injected screw compressor 100 can be effectively avoided.

[0042] In one embodiment of the present application, one end of the drain pipe 2 of the present application can be connected to the exhaust pipe of the safety valve 1051 of the oil-gas separator 105, and the solenoid valve 3 can be set as a two-position two-way solenoid valve 3, wherein one position and one-way is normally open and used to connect to the safety valve 1051, and the other position and one-way is normally closed and used to connect to the outside world.

[0043] In this way, the drain pipe 2 of the present application can share a pipe with the exhaust pipe of the safety valve 1051 (the exhaust pipe of the safety valve 1051 is a necessary safety structure on the existing oil-gas separator 105), which can avoid opening holes on the oil-gas separator 105, thereby avoiding affecting the structural integrity and shell rigidity of the oil-gas separator 105.

[0044] In this embodiment, the working process / working principle can be as follows: when the oil-injected screw compressor 100 is shut down, if the surface temperature of the oil-gas separator 105 obtained by the temperature sensor 1 drops to a certain value, the control unit 4 sends an opening signal to the solenoid valve 3, the solenoid valve 3 is opened, and all the mixed gas in the oil-gas separator 105 will be discharged through the exhaust pipe of the safety valve 1051 and the solenoid valve 3. In this way, the problem of liquid water accumulation in the oil-gas separator 105 caused by the long-term shutdown of the oil-injected screw compressor 100 can be effectively avoided.

[0045] During this process, the safety valve 1051 is relatively independent of the solenoid valve 3. The one-position one-way connection of the safety valve 1051 is in a normally open state, which does not affect its safety pressure relief function. The one-position one-way connection to the outside world is in a normally closed state, which can serve as an emission control structure of the oil-gas separator 105.

[0046] In one embodiment of the present application, Figure 3 As shown, the control unit 4 of the present application may include a data acquisition module 41, a discrimination module 42 and a signal sending module 43; the data acquisition module 41 is used to acquire the temperature data of the temperature sensor 1, the discrimination module 42 is used to determine whether the temperature data of the temperature sensor 1 is greater than the temperature threshold, and the signal sending module 43 is used to send a conduction signal to the solenoid valve 3.

[0047] In this way, the data acquisition unit can obtain the temperature data measured by the temperature sensor 1 in real time, the judgment module 42 can judge the relationship between the temperature data and the temperature threshold in real time, and the signal sending module 43 can send or not send the corresponding conduction signal to the solenoid valve 3 according to the judgment result of the judgment module 42.

[0048] It can be understood that in this embodiment, the temperature threshold can be selected according to actual conditions. For example, different temperature thresholds can be selected in different air pressure areas. For example, it can be selected as 75°C or 80 degrees Celsius. This application does not make specific limitations on this.

[0049] In one embodiment of the present application, the temperature threshold of the present application is set to 70°C-80°C.

[0050] To ensure that the mixed gas in the oil-gas separator 105 can be completely discharged, in one embodiment of the present application, the signal sending module 43 of the present application can also be used to send a cut-off signal to the solenoid valve 3, and there is a time difference between the conduction signal and the cut-off signal.

[0051] When the signal sending module 43 sends a cut-off signal to the solenoid valve 3, the solenoid valve 3 will be closed, and at this time, the oil-gas separator 105 can operate normally. In this way, after the signal sending module 43 sends a conduction signal to the solenoid valve 3, the solenoid valve 3 will be opened, and the mixed gas inside the oil-gas separator 105 will be discharged. In order to ensure that it can be completely discharged, a time difference can be set between the conduction signal and the cut-off signal.

[0052] In this embodiment, the time difference in the above embodiment can be specifically designed according to factors such as the specific model of the oil-gas separator 105, the size of the drain pipe 2 or the exhaust pipe, etc. For example, in one embodiment of the present application, the time difference of the present application can be set to 50s-70s. The present application does not make specific limitations on this.

[0053] In one embodiment of the present application, Figure 2 As shown, the drain pipe 2 of the present application may include a first pipe 21, a second pipe 22 and a third pipe 23. One end of the first pipe 21 is used to communicate with the inner cavity of the oil-gas separator 105, and the other end of the first pipe 21 is respectively connected to the second pipe 22 and the third pipe 23. A safety valve 1051 is arranged on the second pipe 22, and the solenoid valve 3 is arranged on the third pipe 23.

[0054] In this way, the drain pipe 2 thus arranged can be used as a pressure relief pipe for the safety valve 1051 and a discharge pipe for the solenoid valve 3 at the same time, and the safety valve 1051 and the solenoid valve 3 are independent of each other, and the working processes and functions of the two do not interfere with each other. Most importantly, the drain pipe 2 thus arranged can reduce the number of openings on the oil-gas separator 105, thereby reducing the structural impact on the oil-gas separator 105.

[0055] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A system for preventing the head from being soaked in water for an oil-injected screw compressor, characterized in that: include: A temperature sensor (1) is used to be arranged on the outer wall of an oil-gas separator (105) of an oil-injected screw compressor; A drain pipe (2) and a solenoid valve (3), one end of the drain pipe (2) being used to communicate with the inner cavity of the oil-gas separator (105), and the other end of the drain pipe (2) being used to communicate with the outside, and the solenoid valve (3) being arranged on the drain pipe (2) to control the on and off of the drain pipe (2); The control unit (4) is electrically connected to the temperature sensor (1) and the solenoid valve (3) respectively.

2. The system for preventing the head from being soaked in water for an oil-injected screw compressor according to claim 1, characterized in that: One end of the drain pipe (2) is used to communicate with the exhaust pipe of the safety valve of the oil-gas separator (105), and the solenoid valve (3) is configured as a two-position two-way solenoid valve (3), wherein one position and one way is in a normally open state and is used to communicate with the safety valve, and the other position and one way is in a normally closed state and is used to communicate with the outside world.

3. The system for preventing the head from being soaked in water for an oil-injected screw compressor according to claim 1, characterized in that: The control unit (4) comprises a data acquisition module (41), a determination module (42) and a signal sending module (43); the data acquisition module (41) is used to acquire temperature data of the temperature sensor (1), the determination module (42) is used to determine whether the temperature data of the temperature sensor (1) is greater than a temperature threshold, and the signal sending module (43) is used to send a conduction signal to the solenoid valve (3).

4. The system for preventing the head from being soaked in water for an oil-injected screw compressor according to claim 3, characterized in that: The temperature threshold is set to 70°C-80°C.

5. The system for preventing the head from being soaked in water for an oil-injected screw compressor according to claim 3, characterized in that: The signal sending module (43) is also used to send a cut-off signal to the solenoid valve (3), and there is a time difference between the conduction signal and the cut-off signal.

6. The system for preventing the head from being soaked in water for an oil-injected screw compressor according to claim 5, characterized in that: The time difference is set to 50s-70s.

7. The system for preventing the head from being soaked in water for an oil-injected screw compressor according to claim 1, characterized in that: The drain pipe (2) comprises a first pipe (21), a second pipe (22) and a third pipe (23); one end of the first pipe (21) is used to communicate with the inner cavity of the oil-gas separator (105); the other end of the first pipe (21) is respectively communicated with the second pipe (22) and the third pipe (23); a safety valve is arranged on the second pipe (22); and the solenoid valve (3) is arranged on the third pipe (23).

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