Liquid level control structure for oil-injected screw air compressor and oil-injected screw air compressor

Abstract

The present application provides a liquid level control structure for an oil-injected screw air compressor and an oil-injected screw air compressor, which belongs to the technical field of liquid level control for oil-injected screw air compressors, wherein the liquid level control structure for an oil-injected screw air compressor includes a liquid level identification component and a signal transmission component. The liquid level identification component includes a housing, a first magnetic member, a push rod, a connecting soft rod, a buoyancy member, an elastic member and a substrate; the signal transmission component includes a micro switch and a second magnetic member; wherein the first magnetic member and the second magnetic member are arranged opposite to each other, and the first magnetic member and the second magnetic member are configured to repel each other; in a first state, the elastic member is in a compressed state, a first preset distance exists between the first magnetic member and the inner wall of the housing near the closed end, and the second magnetic member is separated from the switch contact; in a second state, the elastic member is in an extended state, a second preset distance exists between the first magnetic member and the inner wall of the housing near the closed end, and the second magnetic member abuts against the switch contact.

Description

Technical Field

[0001] The present application relates to the technical field of liquid level control for oil-injected screw air compressors, and in particular to a liquid level control structure for oil-injected screw air compressors and the oil-injected screw air compressors. Background Art

[0002] Oil-injected screw air compressors include single-screw air compressors and twin-screw air compressors. Due to their high reliability (simple structure and few parts, almost no wearing parts), simple and convenient operation and maintenance, good power balance (especially suitable for mobile air compressors), strong adaptability (volume and flow are almost unaffected by exhaust pressure, and can be applied to a variety of working fluids) and multi-phase mixed transmission (can be used to transport liquid gas, dust-containing gas, easily polymerized gas, etc.), they have been rapidly and widely developed in the field of industrial production.

[0003] Currently, there is no corresponding identification or control device for the lubricating oil level of oil-injected screw air compressors. Only a liquid level sight glass is installed on the shell of the oil-injected screw air compressor to facilitate the operator to observe the liquid level. Although the liquid level sight glass can easily observe the lubricating oil level, the operator does not always observe the liquid level sight glass during the operation of the oil-injected screw air compressor. If the liquid level is too high or too low, the operator often needs to wait until the operator performs a routine inspection or the oil-injected screw air compressor has a lubricating oil leak before the operator is aware of it.

[0004] During this process, especially when the lubricating oil level is high, the oil-gas separation device of the oil-injected screw air compressor is prone to failure or leakage in related pipelines, which may cause the lubricating oil to be discharged with the compressed air or oil leakage, which not only pollutes the environment and destroys the production environment, but also increases the risk of production safety accidents to a certain extent. Summary of the Invention

[0005] To address the problems in the related art, the present application provides a liquid level control structure for an oil-injected screw air compressor and an oil-injected screw air compressor. The liquid level control structure for an oil-injected screw air compressor can accurately and in real time identify when the lubricating oil level is too high and output a corresponding signal accordingly, thereby avoiding the aforementioned technical problems.

[0006] In order to achieve the above objectives, the technical solutions adopted in this application include:

[0007] According to a first aspect of the present application, a liquid level control structure for an oil-injected screw air compressor is provided, which is used to be arranged in the oil-injected screw air compressor to detect the liquid level of the lubricating oil therein, comprising:

[0008] The liquid level identification component comprises a shell, a first magnetic member, a push rod, a connecting soft rod, a buoyancy member, an elastic member and a substrate; a first accommodating cavity is formed in the shell, the first accommodating cavity comprises a closed end located in the shell and an open end extending to one end of the shell; the push rod is movably arranged in the first accommodating cavity, and the first magnetic member is installed at an end of the push rod close to the closed end; the end of the push rod close to the open end is connected to the connecting soft rod, and the end of the connecting soft rod away from the push rod is connected to the buoyancy member; the substrate is installed on the shell for blocking the open end, and a through hole for the connecting soft rod to pass through is opened on the substrate; one end of the elastic member is connected to the substrate, and the other end of the elastic member is used to abut against the end of the push rod away from the closed end;

[0009] a signal transmission assembly disposed outside the housing and located at one end proximal to the closed end, the signal transmission assembly comprising a micro switch and a second magnetic member, the micro switch comprising a housing, a switch body mounted within the housing, and a second accommodating cavity formed within the housing, the second magnetic member being movably disposed within the second accommodating cavity, and a switch contact of the switch body being disposed at an inner top of the second accommodating cavity;

[0010] The first magnetic member and the second magnetic member are arranged opposite to each other, and the first magnetic member and the second magnetic member are configured to repel each other;

[0011] The liquid level control structure for the oil-injected screw air compressor includes a first state and a second state. In the first state, the elastic member is in a compressed state, a first preset distance exists between the first magnetic member and the inner wall of the shell near the closed end, and the second magnetic member and the switch contact are separated from each other, so that the microswitch body is in a disconnected state; in the second state, the elastic member is in an extended state, a second preset distance exists between the first magnetic member and the inner wall of the shell near the closed end, and the second magnetic member abuts against the switch contact, so that the microswitch body is in a connected state; the first preset distance is greater than the second preset distance.

[0012] Optionally, the second magnetic member includes a first portion and a second portion connected to each other, the first portion is located above the second portion, and the first portion is formed in a cylindrical shape, the cross-sectional shape of the second portion at one end close to the first portion is the same as the end surface shape of the first portion, and the radial dimension of the second portion gradually decreases in a direction from the first portion to the second portion;

[0013] The bottom of the second accommodating cavity is formed into a shape that matches the shape of the second part.

[0014] Optionally, the second portion is formed in a hemispherical shape.

[0015] Optionally, a threaded mounting hole is formed at the bottom of the first magnetic member, and a threaded mounting post corresponding to the threaded mounting hole is formed on the push rod.

[0016] Optionally, the first accommodating cavity includes a first section and a second section that are interconnected, the first section is located above the second section, and a radial dimension of the first section is smaller than a radial dimension of the second section;

[0017] The liquid level identification assembly further includes a connecting disk connected to an end of the push rod away from the first magnetic element, the connecting disk being disposed in the second section, and the push rod being disposed in the first section;

[0018] Wherein, in the second state, the connecting plate is located at the top of the second section, and the connecting plate abuts against the inner wall of the housing corresponding to the area between the first section and the second section.

[0019] Optionally, the liquid level identification component also includes two relatively arranged mounting blocks, each of which includes a block body and a mounting groove formed in the block body, the shape of the mounting groove being adapted to the connecting soft rod so as to form an interference fit with the connecting soft rod, and the two mounting blocks being respectively mounted on the buoyancy member and the push rod.

[0020] Optionally, the buoyancy member includes a buoyancy block and a buoyancy cavity formed in the buoyancy block, the buoyancy block includes a connecting portion and a sinking bottom portion connected to each other, the connecting portion is formed into a truncated cone-shaped structure, the small end of the truncated cone-shaped structure is used to connect with the connecting soft rod, and the large end of the truncated cone-shaped structure is connected to the sinking bottom portion, the cross-sectional shape of one end of the sinking bottom portion close to the connecting portion is the same as the end face shape of the large end of the truncated cone-shaped structure, and the radial dimension of the sinking bottom portion gradually decreases in the direction from the connecting portion to the sinking bottom portion.

[0021] Optionally, a radial dimension of the through hole is larger than a radial dimension of the connecting flexible rod.

[0022] Optionally, the liquid level control structure for the oil-injected screw air compressor further includes a verification component, the verification component including a third magnetic member and an electromagnet, the third magnetic member being disposed at an end of the push rod away from the first magnetic member, the electromagnet being disposed on the substrate, the electromagnet being configured as an annular structure, the electromagnet of the annular structure being coaxially disposed with the through hole and sleeved outside the through hole;

[0023] Wherein, the electromagnet is configured to repel the third magnetic attraction component when energized.

[0024] According to the second aspect of the present application, an oil-injected screw air compressor is also provided, comprising an air compressor body and a liquid level control structure for an oil-injected screw air compressor as described in any one of the technical solutions in the first aspect of the present application, wherein the liquid level control structure for the oil-injected screw air compressor is arranged in the air compressor body for detecting the liquid level of the lubricating oil in the air compressor body.

[0025] Beneficial effects:

[0026] 1. Through the above technical solution, on the one hand, the push rod of the present application maintains a stable state, i.e., the first state, under the action of the supporting force of the elastic member and the gravity of the buoyancy member. When the liquid level of the lubricating oil rises, the buoyancy member arranged in the lubricating oil will rise under the action of the buoyancy, so that the downward pulling force on the push rod will be reduced, so that the push rod can move upward under the action of the supporting force of the elastic member, and then the first magnetic member will move upward, that is, the distance between the first magnetic member and the second magnetic member will be reduced, and the second magnetic member can be pressed against the switch contact under the action of the repulsive magnetic force, so that the micro switch is in the on state, that is, the recognition of the high liquid level and the transmission of related signals are realized. Moreover, after the liquid level is controlled, the push rod of the present application will return to its original position under the combined action of the gravity of the buoyancy member and the supporting force of the elastic member, and can be used repeatedly.

[0027] On the other hand, the present application uses a connecting soft rod as a force transmission structure between the buoyancy member and the push rod, which not only enables the push rod to quickly produce corresponding movement when the buoyancy member obtains a large buoyancy, but also enables the liquid level control structure for the oil-injected screw air compressor of the present application to quickly switch from the first state to the second state; moreover, the connecting soft rod provided in the present application has a certain deformation ability and can slide relatively smoothly in the through hole, which can effectively avoid the phenomenon of the connecting soft rod getting stuck or stuck during the switching process between the first state and the second state, which is conducive to making the liquid level control structure for the oil-injected screw air compressor of the present application more suitable for lubricating oils with higher viscosities.

[0028] On another hand, the present application sets the signal transmission component independently from the liquid level identification component, and realizes the transmission of relevant signals by changing the distance between the first magnetic component and the second magnetic component, which can effectively avoid the influence of lubricating oil on the signal transmission component and is beneficial to improving the accuracy of signal transmission and working stability of the signal transmission component.

[0029] In addition, the present application uses a buoyancy member, which can be a float in the existing related technology or a solid buoyancy structure. Whether it is a float or a solid buoyancy structure, there is no need to limit it, and both can realize the identification of the liquid level more accurately and smoothly.

[0030] 2. Other beneficial effects or advantages of this application will be described in detail in conjunction with the specific structure in the specific implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for the embodiments or the description of the prior art. 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 inventive 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. It is only a schematic diagram of the structure or position, among which:

[0032] Figure 1 1 is a schematic diagram of a three-dimensional structure of a liquid level control structure for an oil-injected screw air compressor provided by an exemplary embodiment of the present application from one perspective;

[0033] Figure 2 1 is a schematic diagram of a three-dimensional structure of a liquid level control structure for an oil-injected screw air compressor provided by an exemplary embodiment of the present application from another perspective;

[0034] Figure 3 1 is a schematic cross-sectional view of a liquid level control structure for an oil-injected screw air compressor provided by an exemplary embodiment of the present application, wherein the liquid level control structure for an oil-injected screw air compressor is in a second state;

[0035] Figure 4 yes Figure 3 A magnified schematic diagram of the local structure at point A in the middle;

[0036] Figure 5 yes Figure 3 A magnified schematic diagram of the local structure at point B in the middle;

[0037] Figure 6 1 is a structural exploded diagram of a liquid level control structure for an oil-injected screw air compressor provided by an exemplary embodiment of the present application;

[0038] Figure 7 is a schematic cross-sectional structural diagram of a housing provided by an exemplary embodiment of the present application;

[0039] Figure 8 1 is a schematic diagram of the connection structure of the first magnetic member and the push rod provided in an exemplary embodiment of the present application, wherein the connection disk (or the third magnetic member) and the mounting block are also shown;

[0040] Figure 91 is a schematic diagram of an assembly structure of a calibration component, an elastic member, and a substrate provided in an exemplary embodiment of the present application;

[0041] Figure 10 3D is a schematic diagram of the three-dimensional structure of a buoyancy block provided in an exemplary embodiment of the present application, wherein a mounting block is also shown.

[0042] Description of the reference numerals in the accompanying drawings:

[0043] 100-Liquid level control structure for oil-injected screw air compressor; 1-Liquid level identification component; 11-Casing; 111-First accommodating chamber; 1111-Closed end; 1112-Open end; 1113-First section; 1114-Second section; 12-First magnetic element; 121-Threaded mounting hole; 13-Push rod; 131-Threaded mounting column; 14-Connecting soft rod; 15-Buoyancy element; 151-Buoyancy block; 1511-Connecting portion; 1512-Sinking bottom; 152-Floating Force chamber; 16-elastic member; 17-base plate; 171-through hole; 18-connecting plate; 19-mounting block; 191-block body; 192-mounting slot; 2-signal transmission component; 21-micro switch; 211-housing; 212-switch body; 2121-switch contact; 213-second accommodating chamber; 22-second magnetic member; 221-first part; 222-second part; 3-verification component; 31-third magnetic member; 32-electromagnet; 321-electric conductor. DETAILED DESCRIPTION

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0045] 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 protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without making any creative efforts shall fall within the scope of protection of the present application.

[0046] In the description of this application, it should be noted that the terms used, such as "top" and "bottom," refer to the portion of the liquid level control structure for an oil-injected screw air compressor of this application, near the top, and near the bottom, when in use, as the top; the terms used, such as "first" and "second," are used only to distinguish between the two, and do not indicate or imply a difference in importance or order; and the terms used, such as "inside" and "outside," refer to the inside and outside of a specific contour. The use of the above terms is solely for the purpose of clearly and simply describing the technical solution of this application and should not be construed as limiting this application.

[0047] In order to facilitate relevant technical personnel to have a clearer and more accurate understanding of the technical solution of this application, the existing related technologies are first described in more detail below.

[0048] In the relevant technology, the liquid level sight glass (or liquid level gauge) is often a strip-shaped structure made of transparent material and has a cavity inside. The cavity is used to connect with the lubricating oil pipeline to facilitate the entry of the lubricating oil into the liquid level sight glass. Two reference lines are set on the outside of the liquid level sight glass, namely the lowest liquid level reference line and the highest liquid level reference line. The operator can read the liquid level status of the lubricating oil very conveniently and quickly.

[0049] However, the liquid level sight glass itself does not have the function of liquid level identification, and it cannot output liquid level signals to the outside. Therefore, it is impossible for operators to quickly and timely obtain the liquid level status. Often, the liquid level is out of control (especially when the liquid level is too high) for a period of time before being discovered (which may be discovered during routine inspection or oil leakage some time after the liquid level is out of control). Therefore, it is impossible to timely avoid the environmental pollution caused by lubricant leakage and the impact on production safety.

[0050] In addition, in the existing related art, there is also a method of using a float-type liquid level control mechanism to identify and control the liquid level of the lubricating oil (see Publication No.: CN111365238B, a Chinese patent document for a screw compressor with an explosion-proof liquid level controller). This mechanism uses the buoyancy change of the float and the cooperation of a magnetic block and a reed sensor to monitor the liquid level of the lubricating oil in real time. However, in conventional float-type liquid level control mechanisms, due to the thin tube wall and low quality of the float, if it is not limited, it is easy to deviate. If it is limited (as in the technical solution adopted by Publication No.: CN111365238B, a Chinese patent document for a screw compressor with an explosion-proof liquid level controller, which uses a filter cartridge to limit the movement direction of the float), due to the high viscosity of the lubricating oil, the float is easily stuck and cannot float up or down, making it impossible to accurately and quickly identify the liquid level status.

[0051] The technical solution of this application is described in detail below with reference to the accompanying drawings.

[0052] Example 1

[0053] like Figures 1 to 10 As shown, according to the first aspect of the present application, this embodiment provides a liquid level control structure 100 for an oil-injected screw air compressor, which is used to be arranged in the oil-injected screw air compressor to detect the liquid level of the lubricating oil therein, including a liquid level identification component 1 and a signal transmission component 2. The liquid level identification component 1 includes a shell 11, a first magnetic member 12, a push rod 13, a connecting soft rod 14, a buoyancy member 15, an elastic member 16 and a base plate 17; a first accommodating chamber 111 is formed in the shell 11, and the first accommodating chamber 111 includes a closed end 1111 located in the shell 11 and an open end 1112 extending to one end of the shell 11; the push rod 13 is movably arranged in the first accommodating chamber 111, and the first magnetic member 12 is installed on the push rod 13 near the closed end 1111. One end of 111; one end of the push rod 13 close to the open end 1112 is connected to the connecting soft rod 14, and the end of the connecting soft rod 14 away from the push rod 13 is connected to the buoyancy member 15; a base plate 17 is installed on the shell 11 to block the open end 1112, and a through hole 171 for the connecting soft rod 14 to pass through is provided on the base plate 17; one end of the elastic member 16 is connected to the base plate 17, and the other end of the elastic member 16 is used to abut against the end of the push rod 13 away from the closed end 1111.

[0054] The signal transmission component 2 is arranged outside the shell 11 and is located at one end close to the closed end 1111. The signal transmission component 2 includes a micro switch 21 and a second magnetic component 22. The micro switch 21 includes a shell 211, a switch body 212 installed in the shell 211 and a second accommodating cavity 213 formed in the shell 211. The second magnetic component 22 is movably arranged in the second accommodating cavity 213, and the switch contact 2121 of the switch body 212 is arranged at the inner top of the second accommodating cavity 213; wherein, the first magnetic component 12 and the second magnetic component 22 are arranged opposite to each other, and the first magnetic component 12 and the second magnetic component 22 are configured to repel each other.

[0055] The liquid level control structure 100 for an oil-injected screw air compressor of the present application includes a first state and a second state. In the first state, the elastic member 16 is in a compressed state, and there is a first preset distance between the first magnetic member 12 and the inner wall of the shell 11 near the closed end 1111, and the second magnetic member 22 and the switch contact 2121 are separated from each other, so that the micro switch 21 body is in a disconnected state; in the second state, the elastic member 16 is in an extended state, and there is a second preset distance between the first magnetic member 12 and the inner wall of the shell 11 near the closed end 1111, and the second magnetic member 22 presses against the switch contact 2121, so that the micro switch 21 body is in a conductive state; the first preset distance is greater than the second preset distance.

[0056] Through the above technical solution, on the one hand, the push rod 13 of the present application maintains a stable state, i.e., a first state, under the action of the supporting force of the elastic member 16 (i.e., an upward thrust for the push rod 13) and the gravity of the buoyancy member 15 (i.e., a downward pull for the push rod 13). When the liquid level of the lubricating oil rises, the buoyancy member 15 disposed in the lubricating oil will rise under the action of the buoyancy, thereby reducing the downward pull on the push rod 13, so that the push rod 13 can move upward under the action of the supporting force of the elastic member 16, thereby causing the first magnetic member 12 to move upward, i.e., reducing the distance between the first magnetic member 12 and the second magnetic member 22, and allowing the second magnetic member 22 to press against the switch contact 2121 under the action of the repulsive magnetic forces, so that the micro switch 21 is in the on state, i.e., realizing the recognition of the high liquid level and the transmission of the relevant signal. Moreover, after the liquid level is controlled (i.e., after it is lowered from a high liquid level to a normal liquid level), the push rod 13 of the present application will return to its original position (i.e., return to the first state) under the combined action of the gravity of the buoyancy member 15 and the supporting force of the elastic member 16, and can be used repeatedly.

[0057] On the other hand, the present application uses the connecting soft rod 14 as a force transmission structure between the buoyancy member 15 and the push rod 13, which not only enables the push rod 13 to quickly produce corresponding movement when the buoyancy member 15 obtains a large buoyancy, but also enables the liquid level control structure 100 for the oil-injected screw air compressor of the present application to quickly switch from the first state to the second state (that is, quickly realize the corresponding high liquid level identification and the transmission of related signals); moreover, the connecting soft rod 14 set in the present application has a certain deformation ability and can slide relatively smoothly in the through hole 171, which can effectively avoid the connecting soft rod 14 from getting stuck or stuck during the switching process between the first state and the second state (compared with the technical solution of the hard connecting rod in the existing related technology, the hard connecting rod is prone to eccentric getting stuck or stuck), which is conducive to making the liquid level control structure 100 for the oil-injected screw air compressor of the present application more suitable for lubricating oils with higher viscosity.

[0058] On the other hand, the present application sets the signal transmission component 2 independently from the liquid level identification component 1, and realizes the transmission of relevant signals by changing the distance between the first magnetic component 12 and the second magnetic component 22, which can effectively avoid the influence of lubricating oil on the signal transmission component 2, and is conducive to improving the accuracy of signal transmission and working stability of the signal transmission component 2.

[0059] In addition, the present application uses a buoyancy member 15, which can be a float in the existing related technology or a solid buoyancy structure. Whether it is a float or a solid buoyancy structure, it does not need to be limited (which can also avoid the problem of the float sticking and causing the lubricating oil level to be unable to be accurately and quickly identified), and both can realize the identification of the liquid level more accurately and smoothly.

[0060] In the present application, it is understood that, first, the microswitch 21 of the present application can be electrically connected to a related alarm device so that when the microswitch 21 is in the on state, it can output an alarm signal indicating that the liquid level is too high to the outside world; the microswitch 21 of the present application can also be electrically connected to a related control valve so that when the microswitch 21 is in the on state, the amount of lubricating oil supplied to the pipeline can be reduced through the control valve to lower the liquid level. This application does not specifically limit whether the microswitch 21 serves as a device for transmitting alarm signals or as a signal control device for the opening of the related valve.

[0061] Second, the elastic member 16 of the present application can have multiple embodiments. For example, in an exemplary embodiment of the present application, Figure 3 、 Figure 5 、 Figure 6 and Figure 9 As shown, the elastic member 16 of the present application can be configured as a spring. Specifically, the spring can be made of a metal material, such as copper, copper alloy, etc., or a non-metallic material, such as rubber or plastic. The present application does not specifically limit its material. In another embodiment of the present application, the elastic member 16 of the present application can also be configured as a spring or an elastomer (e.g., a rubber body, a silicone body, etc.). The present application does not specifically limit the structural form of the elastic member 16.

[0062] Third, the connection method between the base plate 17 and the housing 11 of the present application can be a fixed connection method such as bonding or welding, or a detachable connection method such as threaded connection, snap connection, pin connection, etc. Similarly, the connection method between the first magnetic member 12 and the push rod 13 of the present application, the connection method between the push rod 13 and the connecting rod 14 of the present application, and the connection method between the connecting rod 14 and the buoyancy member 15 of the present application can all adopt the above-mentioned fixed connection method or the above-mentioned detachable connection method, and the present application does not make specific restrictions on this.

[0063] Fourth, the second preset distance of the present application can be equal to the thickness of the end of the housing 11 near the closed end 1111 (i.e., in the second state, the first magnetic member 12 and the inner wall of the end of the housing 11 near the closed end 1111 are in abutment with each other), or it can be slightly greater than the thickness of the end of the housing 11 near the closed end 1111 (i.e., in the second state, there is a certain distance between the first magnetic member 12 and the inner wall of the end of the housing 11 near the closed end 1111). This application does not make any specific restrictions on this.

[0064] In one embodiment of the present application, Figure 3 and Figure 4 As shown, the second magnetic component 22 of the present application includes a first part 221 and a second part 222 connected to each other, the first part 221 is located above the second part 222, and the first part 221 is formed into a cylindrical shape, and the cross-sectional shape of the second part 222 at one end close to the first part 221 is the same as the end face shape of the first part 221, and, in the direction from the first part 221 to the second part 222, the radial dimension of the second part 222 gradually decreases, wherein the bottom of the second accommodating cavity 213 is formed into a shape that is adapted to the shape of the second part 222.

[0065] In this way, compared with the technical solution in which the second magnetic component 22 is formed as a block structure such as a cylinder or a cube, the second magnetic component 22 configured in this way in the present application can effectively avoid the jamming or stuck phenomenon caused by the deflection of the second magnetic component 22 when rising or falling, and can effectively ensure that the second magnetic component 22 can accurately and smoothly return to its original position (that is, the first state).

[0066] In one embodiment of the present application, the second portion 222 of the present application can be formed into a hemispherical shape. The hemispherical second portion 222 can further effectively avoid the problem of the second magnetic member 22 being stuck or jammed due to deflection when rising or falling.

[0067] In addition, to further prevent the second magnetic member 22 from becoming stuck or stuck due to deflection during ascent or descent, the second magnetic member 22 of the present application can also be directly configured as a spherical shape. The bottom of the corresponding second accommodating cavity 213 is formed into a hemispherical cavity, and the top of the second accommodating cavity 213 is formed into a cylindrical cavity.

[0068] In one embodiment of the present application, Figure 3 、 Figure 4 as well as Figure 8As shown, a threaded mounting hole 121 is provided at the bottom of the first magnetic member 12 of the present application, and a threaded mounting column 131 corresponding to the threaded mounting hole 121 is formed on the push rod 13. In this way, not only can the push rod 13 and the first magnetic member 12 be effectively and reliably connected, but it is also convenient to replace the first magnetic member 12 or the push rod 13 when necessary. In this way, compared with the fixed connection between the push rod 13 and the first magnetic member 12, the detachable connection through the threaded connection can effectively avoid the problem of replacing the push rod 13 and the first magnetic member 12 completely due to the need to replace a single component (the push rod 13 or the first magnetic member 12), which is beneficial to reduce the cost of maintenance and replacement.

[0069] In one embodiment of the present application, Figure 3 、 Figure 5 、 Figure 6 and Figure 8 As shown, the first accommodating cavity 111 of the present application may include a first section 1113 and a second section 1114 that are interconnected, the first section 1113 is located above the second section 1114, and the radial dimension of the first section 1113 is smaller than the radial dimension of the second section 1114; the liquid level identification component 1 also includes a connecting disk 18, which is connected to the end of the push rod 13 away from the first magnetic component 12, the connecting disk 18 is arranged in the second section 1114, and the push rod 13 is arranged in the first section 1113; wherein, in the second state, the connecting disk 18 is located at the top of the second section 1114, and the connecting disk 18 and the shell 11 are against the inner wall between the first section 1113 and the second section 1114.

[0070] In this way, through the first accommodating cavity 111 and the connecting plate 18 arranged in this way, not only can the connecting plate 18 form an abutment with the inner wall of the shell 11 in the second state, thereby effectively avoiding the push rod 13 from over-extruding the first magnetic component 12, so as to ensure the structural stability of the first magnetic component 12 and provide a relatively stable magnetic force to the second magnetic component 22, but also, the connecting plate 18 arranged in this way can also prompt the state of the push rod 13 being assembled in place during assembly, so as to avoid over-assembly of the push rod 13 (during assembly, the abutment of the connecting plate 18 can be regarded as the push rod 13 being assembled in place), thereby effectively avoiding the push rod 13 from over-extruding the first magnetic component 12 during assembly.

[0071] In one embodiment of the present application, Figure 3 、 Figure 5 、 Figure 6 as well as Figure 8 and Figure 9As shown, the liquid level identification component 1 of the present application can also include two relatively arranged mounting blocks 19, the mounting block 19 includes a block body 192191 and a mounting groove formed in the block body 192191, the shape of the mounting groove is adapted to the connecting soft rod 14, so as to form an interference fit with the connecting soft rod 14, and the two mounting blocks 19 are respectively installed on the buoyancy member 15 and the push rod 13.

[0072] Thus, on the one hand, the connecting rod 14 can form a reliable connection state with the push rod 13 (or the connecting plate 18 or the third magnetic member 31 described below) and the buoyancy member 15 respectively through two oppositely arranged mounting blocks 19. On the other hand, the mounting blocks 19 arranged in this way can facilitate the replacement of the connecting rod 14, so as to adjust the length of the connecting rod 14 according to actual needs, thereby adjusting the specific identification liquid level of the liquid level control structure 100 for the oil-injected screw air compressor of the present application to meet the lubricating oil level identification requirements of different oil-injected screw air compressors.

[0073] In one embodiment of the present application, Figure 3 and Figure 10 As shown, the buoyancy member 15 of the present application may include a buoyancy block 151 and a buoyancy chamber 152 formed in the buoyancy block 151, the buoyancy block 151 includes a connecting portion 1511 and a sinking bottom portion 1512 connected to each other, the connecting portion 1511 is formed into a truncated cone structure, the small end of the truncated cone structure is used to connect with the connecting soft rod 14, and the large end of the truncated cone structure is connected to the sinking bottom portion 1512, the cross-sectional shape of one end of the sinking bottom portion 1512 close to the connecting portion 1511 is the same as the end face shape of the large end of the truncated cone structure, and the radial dimension of the sinking bottom portion 1512 gradually decreases in the direction from the connecting portion 1511 to the sinking bottom portion 1512.

[0074] In this way, on the one hand, through the buoyancy block 151 in the above technical solution, the buoyancy block 151 can be automatically centered in the lubricating oil (i.e., the connecting soft rod 14 is kept in a vertical state) so as to better transmit the liquid level information. At the same time, even if the lubricating oil has a certain fluctuation (flow), since the buoyancy block 151 of the present application has an outer surface that is more convenient for the flow of lubricating oil, the amplitude of the shaking of the buoyancy block 151 caused by the fluctuation (flow) of the lubricating oil can be reduced, thereby ensuring the accuracy of liquid level identification. In addition, the buoyancy block 151 set up in this way also has a strong pressure resistance. On the other hand, the buoyancy chamber 152 set in the buoyancy block 151 of the present application can enhance the buoyancy of the buoyancy block 151 in the lubricating oil, and there is no need to set a guide rod in the related technology, which can effectively avoid the failure of the float to move due to the high viscosity of the lubricating oil. On the other hand, the volume of the connecting part 1511 and / or the sinking bottom part 1512 can be adjusted to change its weight, thereby achieving fine-tuning of the liquid level identification position to adapt to the deviation of the liquid level identification position caused by density changes of different lubricants (mainly lubricants of different densities), which is beneficial to improving the accuracy of liquid level identification of the liquid level control structure 100 for the oil-injected screw air compressor of the present application.

[0075] In one embodiment of the present application, Figure 5 As shown, the radial dimension of the through hole 171 of the present application can be larger than the radial dimension of the flexible connecting rod 14. This can avoid the problem of the flexible connecting rod 14 getting stuck or stuck when moving in the through hole 171, which is conducive to improving the smoothness and accuracy of liquid level recognition of the liquid level control structure 100 for the oil-injected screw air compressor of the present application.

[0076] In one embodiment of the present application, Figures 1 to 3 、 Figure 5 、 Figure 6 as well as Figure 9 As shown, the liquid level control structure 100 for the oil-injected screw air compressor of the present application may also include a verification component 3, which may include a third magnetic component 31 and an electromagnet 32. The third magnetic component 31 is arranged at an end of the push rod 13 away from the first magnetic component 12, and the electromagnet 32 ​​is arranged on the substrate 17. The electromagnet 32 ​​is arranged into an annular structure, and the electromagnet 32 ​​of the annular structure is coaxially arranged with the through hole 171 and is sleeved outside the through hole 171; wherein the electromagnet 32 ​​is configured to be able to repel each other with the third magnetic component 31 when energized.

[0077] During assembly and debugging (or routine inspection), the electromagnet 32 ​​can be energized (or alternately energized and deenergized) via the electrical conductor 321, so that the electromagnet 32 ​​generates magnetism and can repel the third magnetic member 31. In this way, the third magnetic member 31 is subjected to the repulsive force of the electromagnet 32 ​​and drives the push rod 13 to rise, thereby switching the liquid level control structure 100 for the oil-injected screw air compressor of the present application from the first state to the second state. The operator can determine whether the liquid level control structure 100 for the oil-injected screw air compressor of the present application is operating normally by observing the conductive state of the micro switch 21. This not only helps to avoid disassembling the entire liquid level control structure 100 for the oil-injected screw air compressor for testing, but also, if some parts of the liquid level control structure 100 for the oil-injected screw air compressor of the present application become stuck or stuck, the above debugging process can also be used to actively actuate the relevant parts, thereby achieving the effect of active maintenance.

[0078] According to the second aspect of the present application, an oil-injected screw air compressor is also provided, including an air compressor body (not shown) and a liquid level control structure 100 for an oil-injected screw air compressor according to any technical solution in the first aspect of the present application. The liquid level control structure 100 for an oil-injected screw air compressor is arranged in the air compressor body to detect the liquid level of the lubricating oil in the air compressor body.

[0079] Thus, the oil-injected screw air compressor provided by the present application can, on the one hand, not only quickly and accurately identify high lubricating oil levels in the oil-injected screw air compressor but also quickly and in real time transmit relevant level information. Furthermore, it can avoid the problems of the float ball running off the track or becoming stuck and unable to move that are common in existing related technologies.

[0080] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. The liquid level control structure for oil-injected screw air compressor is characterized by: Used to be installed in the oil-injected screw air compressor to detect the liquid level of the lubricating oil therein, including: A liquid level identification component (1) comprises a shell (11), a first magnetic member (12), a push rod (13), a connecting soft rod (14), a buoyancy member (15), an elastic member (16) and a base plate (17); a first accommodating cavity (111) is formed in the shell (11), and the first accommodating cavity (111) comprises a closed end (1111) located in the shell (11) and an open end (1112) extending to one end of the shell (11); the push rod (13) is movably arranged in the first accommodating cavity (111), and the first magnetic member (12) is installed on the push rod (13) near the closed end (1111). one end; an end of the push rod (13) close to the open end (1112) is connected to the connecting soft rod (14), and an end of the connecting soft rod (14) away from the push rod (13) is connected to the buoyancy member (15); the base plate (17) is mounted on the shell (11) for blocking the open end (1112), and a through hole (171) for the connecting soft rod (14) to pass through is provided on the base plate (17); one end of the elastic member (16) is connected to the base plate (17), and the other end of the elastic member (16) is used to abut against an end of the push rod (13) away from the closed end (1111); A signal transmission component (2) is arranged outside the housing (11) and located at one end close to the closed end (1111), the signal transmission component (2) includes a micro switch (21) and a second magnetic member (22), the micro switch (21) includes a housing (211), a switch body (212) installed in the housing (211), and a second accommodating cavity (213) formed in the housing (211), the second magnetic member (22) is movably arranged in the second accommodating cavity (213), and the switch contact (2121) of the switch body (212) is arranged at the inner top of the second accommodating cavity (213); Wherein, the first magnetic attraction member (12) and the second magnetic attraction member (22) are arranged opposite to each other, and the first magnetic attraction member (12) and the second magnetic attraction member (22) are configured to repel each other; The liquid level control structure (100) for an oil-injected screw air compressor includes a first state and a second state. In the first state, the elastic member (16) is in a compressed state, a first preset distance exists between the first magnetic member (12) and the inner wall of the housing (11) near the closed end (1111), and the second magnetic member (22) and the switch contact (2121) are separated from each other, so that the micro switch (21) body is in an off state; in the second state, the elastic member (16) is in an extended state, a second preset distance exists between the first magnetic member (12) and the inner wall of the housing (11) near the closed end (1111), and the second magnetic member (22) abuts against the switch contact (2121), so that the micro switch (21) body is in an on state; the first preset distance is greater than the second preset distance; The second magnetic member (22) comprises a first portion (221) and a second portion (222) connected to each other, the first portion (221) being located above the second portion (222), and the first portion (221) being formed into a cylindrical shape, the cross-sectional shape of the second portion (222) at one end close to the first portion (221) being the same as the end face shape of the first portion (221), and the radial dimension of the second portion (222) gradually decreasing in a direction from the first portion (221) to the second portion (222); wherein the bottom of the second accommodating cavity (213) is formed into a shape adapted to the shape of the second portion (222); A threaded mounting hole (121) is formed at the bottom of the first magnetic attraction member (12), and a threaded mounting column (131) corresponding to the threaded mounting hole (121) is formed on the push rod (13).

2. The liquid level control structure for an oil-injected screw air compressor according to claim 1, characterized in that: The second portion (222) is formed in a hemispherical shape.

3. The liquid level control structure for an oil-injected screw air compressor according to claim 1, characterized in that: The first accommodating cavity (111) comprises a first section (1113) and a second section (1114) that are interconnected, the first section (1113) is located above the second section (1114), and the radial dimension of the first section (1113) is smaller than the radial dimension of the second section (1114); The liquid level identification component (1) further comprises a connecting disk (18), the connecting disk (18) being connected to an end of the push rod (13) away from the first magnetic attraction member (12), the connecting disk (18) being arranged in the second section (1114), and the push rod (13) being arranged in the first section (1113); Wherein, in the second state, the connecting plate (18) is located at the top of the second section (1114), and the connecting plate (18) abuts against the inner wall of the housing (11) corresponding to the first section (1113) and the second section (1114).

4. The liquid level control structure for an oil-injected screw air compressor according to claim 1, characterized in that: The liquid level identification assembly (1) further comprises two mounting blocks (19) arranged opposite to each other, the mounting blocks (19) comprising a block body (191) and a mounting groove (192) formed in the block body (191), the shape of the mounting groove (192) being adapted to the connecting soft rod (14) so ​​as to form an interference fit with the connecting soft rod (14), and the two mounting blocks (19) being respectively mounted on the buoyancy member (15) and the push rod (13).

5. The liquid level control structure for an oil-injected screw air compressor according to claim 1, characterized in that: The buoyancy member (15) includes a buoyancy block (151) and a buoyancy chamber (152) formed in the buoyancy block (151). The buoyancy block (151) includes a connecting portion (1511) and a sinking bottom portion (1512) connected to each other. The connecting portion (1511) is formed into a truncated cone-shaped structure. The small end of the truncated cone-shaped structure is used to connect with the connecting soft rod (14). The large end of the truncated cone-shaped structure is connected to the sinking bottom portion (1512). The cross-sectional shape of one end of the sinking bottom portion (1512) close to the connecting portion (1511) is the same as the end face shape of the large end of the truncated cone-shaped structure. In the direction from the connecting portion (1511) to the sinking bottom portion (1512), the radial dimension of the sinking bottom portion (1512) gradually decreases.

6. The liquid level control structure for an oil-injected screw air compressor according to claim 1, characterized in that: The radial dimension of the through hole (171) is greater than the radial dimension of the connecting soft rod (14).

7. The liquid level control structure for an oil-injected screw air compressor according to any one of claims 1 to 6, characterized in that: The liquid level control structure (100) for the oil-injected screw air compressor further includes a verification component (3), the verification component (3) including a third magnetic component (31) and an electromagnet (32), the third magnetic component (31) being arranged at an end of the push rod (13) away from the first magnetic component (12), the electromagnet (32) being arranged on the substrate (17), the electromagnet (32) being arranged as an annular structure, the electromagnet (32) of the annular structure being coaxially arranged with the through hole (171) and being sleeved outside the through hole (171); The electromagnet (32) is configured to repel the third magnetic attraction member (31) when energized.

8. Oil-injected screw air compressor, characterized in that: The invention comprises an air compressor body and a liquid level control structure (100) for an oil-injected screw air compressor according to any one of claims 1 to 7, wherein the liquid level control structure (100) for an oil-injected screw air compressor is arranged in the air compressor body to detect the liquid level of the lubricating oil in the air compressor body.

Images