Oil return device for oil-gas separator filter element

Abstract

The oil return device for the oil-gas separator filter element comprises an oil-gas separator barrel and the oil-gas separator filter element, the oil-gas separator barrel is provided with an oil return pipe connected with a screw air compressor, and the bottom of the oil-gas separator filter element is provided with an oil collecting box and an oil discharge outlet communicated with the oil collecting box. The inner end of the oil return pipe sequentially penetrates through the oil-gas separator barrel and the bottom of the oil-gas separator filter element, enters the oil collecting box and is located at the bottom of the oil collecting box. According to the technical scheme, the phenomenon that settled engine oil blocks the bottom of the oil-gas separator filter element due to long-term existence of the settled engine oil is avoided, so that the filtering effect of the bottom of the oil-gas separator filter element is improved; compressed air in the filter element of the oil-gas separator does not take away settled engine oil in the oil collecting box easily, so that the settled engine oil is prevented from being taken away by the compressed air, and the separation efficiency of the oil-gas separator is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to screw air compressor oil gas separation technical field especially is an oil gas separator filter core oil return device. BACKGROUND

[0002] Screw air compressor is generally large air compressor, in order to ensure that air compressor long time normal operation, its inside will inject a large amount of lubricating oil, and in the operation process, the output compressed air will carry a certain amount of built-in oil, in order to recover this oil leakage phenomenon, the existing screw air compressor will be compressed air output pipeline adopt oil gas pipe and connect an oil gas separator, through the device, the compressed air carrying oil is separated, the separated oil is recycled to the screw air compressor after cooling treatment through the oil cooler, and there is a return pipe on the upside of the oil gas separator into the built-in oil gas separator filter core, which can recover the oil settled at the bottom of the oil gas separator filter core. The existing oil gas separator filter core oil return device causes the oil to settle at the bottom of the oil gas separator filter core for a long time, reduces the filtering effect of the bottom of the oil gas separator filter core, and the settled oil is easy to be carried away by compressed air, resulting in the separation efficiency of the oil gas separator being reduced.

[0003] For example, Chinese patent publication No. CN202707505U, published on January 30, 2013, named "Screw air compressor lubricating oil oil saving device", including oil gas separator, in the oil gas separator upper side is equipped with filter core, one side is equipped with the oil gas pipe and return pipe connected with screw air compressor, the other side is equipped with the exhaust pipe connected with air cooler and the oil pump pipe connected with oil cooler, the inner end of the oil pump pipe enters the lower part of the oil gas separator, the technical scheme adopted is that: the return pipe of the oil gas separator connected with the screw air compressor enters the filter core from the upper side of the oil gas separator, and the head of the return pipe is located at the bottom of the filter core.

[0004] The existing patent has the following disadvantages: the existing oil gas separator filter core oil return device causes the oil to settle at the bottom of the oil gas separator filter core for a long time, reduces the filtering effect of the bottom of the oil gas separator filter core, and the settled oil is easy to be carried away by compressed air, resulting in the separation efficiency of the oil gas separator being reduced. UTILITY MODEL CONTENTS

[0005] The utility model discloses a first purpose to improve the existing oil gas separator filter core bottom long-term existence settlement oil, reduce the filtering effect of the bottom of the oil gas separator filter core problem, provide a kind of oil gas separator filter core oil return device for reducing the settlement oil of the bottom of the oil gas separator filter core, improve the filtering effect of the bottom of the oil gas separator filter core.

[0006] The second purpose of the utility model is to improve the problem of the long-term existence of settled machine oil in the bottom of the existing oil-gas separator filter element, the settled oil being easily taken away by compressed air to cause the separation efficiency of the oil-gas separator to be reduced, and provide an oil-gas separator filter element oil return device capable of reducing the settled machine oil in the bottom of the oil-gas separator filter element, reducing the settled machine oil taken away by compressed air and improving the separation efficiency of the oil-gas separator.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0008] An oil-gas separator filter element oil return device, comprising an oil-gas separator cylinder body and an oil-gas separator filter element, wherein an oil return pipe connected with a screw air compressor is arranged on the oil-gas separator cylinder body, an oil collecting box and an oil discharge port communicating with the oil collecting box are arranged at the bottom of the oil-gas separator filter element, and the inner end of the oil return pipe passes through the oil-gas separator cylinder body and the bottom of the oil-gas separator filter element in sequence and enters the oil collecting box and is located at the bottom of the oil collecting box.

[0009] Working principle: the outer end of the oil return pipe is connected with a screw compressor, the inner end of the oil return pipe passes through the oil-gas separator cylinder body and the bottom of the oil-gas separator filter element in sequence and enters the oil collecting box and is located at the bottom of the oil collecting box, and the machine oil settled at the bottom of the oil collecting box is discharged in time, greatly improving the problem of the long-term settlement of machine oil in the bottom of the oil-gas separator filter element.

[0010] As a preferred, the oil return pipe is provided with an electromagnetic valve for opening and closing the oil return pipe, and the electromagnetic valve is located outside the oil-gas separator cylinder body. The electromagnetic valve controls the opening and closing of the oil return pipe, prevents the oil return pipe from returning the compressed air filtered in the oil-gas separator filter element together with the settled machine oil in the case of the oil return pipe being always open, and improves the oil return rate of the oil return pipe.

[0011] As a preferred, the oil return pipe is provided with an oil observation mirror, and the oil observation mirror is located outside the oil-gas separator cylinder body. The oil observation mirror is convenient for observing the oil return condition in the oil return pipe, and the electromagnetic valve can be manually closed through the oil return condition. The oil observation mirror in the technical scheme comprises a transparent body and connecting pieces arranged at both ends of the transparent body, an oil observation channel is arranged in the transparent body, the connecting pieces are connected with the oil return pipe and are provided with flow channels communicating with the oil return pipe and the oil observation channel, and the oil observation channel is connected with the oil return pipe, thereby being convenient for observing the oil return condition in the oil return pipe.

[0012] As preferred, the oil outlet of the oil-gas separator filter core is connected with an oil outlet pipe, and the inner wall of the oil outlet pipe is a conical surface with a large upper diameter and a small lower diameter. This facilitates oil discharge at the bottom of the oil-gas separator filter core.

[0013] As preferred, the inner wall of the bottom of the oil-gas separator filter core is a concave surface, and the oil outlet is located in the concave surface. This allows the machine oil to be deposited in the concave surface at the bottom of the oil-gas separator filter core and smoothly enter the oil outlet, thereby facilitating oil discharge at the bottom of the oil-gas separator filter core.

[0014] As preferred, the oil level controller is arranged in the oil collecting box, and the oil level controller comprises an oil level control rod arranged in the oil collecting box and an oil level sensor arranged on the oil level control rod. The oil level controller is electrically connected with the electromagnetic valve. In this technical solution, the oil level controller is electrically connected with the electromagnetic valve to automatically open and close the oil return device. The electromagnetic valve is normally closed. When the oil level sensor detects that the oil level in the oil collecting box exceeds the set oil level height, the oil level controller controls the electromagnetic valve to open for oil return operation. When the oil level sensor detects that the oil level in the oil collecting box is lower than the set oil level height, the oil level controller controls the electromagnetic valve to close to prevent the compressed air from being extracted by the oil return pipe. The oil level sensor and the electromagnetic valve control can timely discharge the machine oil and prevent the compressed air from being extracted by the oil return pipe.

[0015] In this technical solution, the oil level controller is wired or wirelessly connected with the electromagnetic valve. When the oil level controller is wirelessly connected with the electromagnetic valve through a control box and a transmitter, the control box and the transmitter are arranged on the oil collecting box.

[0016] As preferred, the oil level sensor comprises a dry reed tube arranged in the oil level control rod and a magnetic floating ball sleeved on the oil level control rod. An upper limit ring is arranged above the magnetic floating ball and arranged on the oil level control rod. A lower limit ring is arranged below the magnetic floating ball and arranged on the oil level control rod.

[0017] As preferred, the oil level sensor comprises a high-level sensor and a low-level sensor. The high-level sensor is located above the low-level sensor. When the oil level in the oil collecting box exceeds or is lower than the set threshold, the oil level sensor triggers the corresponding control and alarm signals to take corresponding measures.

[0018] As preferred, the oil level control rod comprises a vertical rod and a horizontal rod for fixing the upper part of the vertical rod in the oil collecting box. The oil level sensor is arranged on the vertical rod. The magnetic floating ball vertically rises and falls.

[0019] As preferred, the electromagnetic valve is connected with an electromagnetic valve controller. The electromagnetic valve controller comprises a time delay relay. The electromagnetic valve controller controls the interval action time of the electromagnetic valve through the time delay relay.

[0020] Therefore, the oil-gas separator filter core bottom is prevented from being blocked by the long-term deposition of machine oil, thereby improving the filtering effect of the oil-gas separator filter core bottom; the compressed air in the oil-gas separator filter core is less likely to take away the machine oil in the oil collecting box, thereby reducing the machine oil taken away by the compressed air and improving the separation efficiency of the oil-gas separator; the oil level sensor and the electromagnetic valve control can timely discharge the machine oil and prevent the compressed air from being extracted by the oil return pipe. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a sectional view of the embodiment one of the utility model.

[0022] Figure 2 is a structural schematic view of the embodiment one of the utility model.

[0023] Figure 3 is a sectional view of the embodiment two of the utility model.

[0024] Figure 4 is a sectional view of the embodiment three of the utility model.

[0025] Figure 5 is a structural schematic view of the oil level observation glass in the embodiment one of the utility model.

[0026] As shown in the figure:

[0027] The oil-gas separator cylinder body 1,

[0028] The oil-gas separator filter core 2, the oil discharge port 2.1,

[0029] The oil return pipe 3, the oil collecting box 4, the electromagnetic valve 5, the oil level observation glass 6, the oil discharge pipe 7,

[0030] The oil level controller 8, the oil level control rod 8.1, the vertical rod 8.1.1, the horizontal rod 8.1.2, the oil level sensor 8.2, the magnetic floating ball 8.2.1, the upper limit ring 8.2.2, and the lower limit ring 8.2.3. DETAILED DESCRIPTION

[0031] In order to make the technical scheme embodiment purpose, technical scheme and advantages of the utility model clearer, the utility model is further described below in combination with the drawings and specific embodiments.

[0032] Embodiment one, as Figure 1 , Figure 2 , Figure 5The oil return device for the oil-gas separator filter element shown in the embodiment comprises an oil-gas separator cylinder 1 and an oil-gas separator filter element 2, the oil-gas separator cylinder 1 is provided with an oil return pipe 3 connected with a screw air compressor, the bottom of the oil-gas separator filter element 2 is provided with an oil collecting box 4 and an oil discharge port 2.1 connected with the oil collecting box 4, the inner end of the oil return pipe 3 penetrates the oil-gas separator cylinder 1 and the bottom of the oil-gas separator filter element 2 in sequence and enters the oil collecting box 4 and is located at the bottom of the oil collecting box 4.

[0033] The screw air compressor is generally a large air compressor, in order to ensure the long-term normal operation of the air compressor, a large amount of lubricating oil is injected into the air compressor, and a certain amount of built-in machine oil is brought into the output compressed air in the operation process, in order to recover the oil leakage phenomenon, the existing screw air compressor connects the output pipeline of the compressed air with an oil-gas pipe and then connects an oil-gas separator, the compressed air with the built-in machine oil is separated by the device, the separated machine oil is cooled and treated by an oil cooler and then is recovered into the screw air compressor for reuse, and a return pipe 3 is further arranged on the upper side of the oil-gas separator and enters the built-in oil-gas separator filter element 2, so that the machine oil deposited at the bottom of the oil-gas separator filter element 2 is recovered again. The existing oil-gas separator filter element 2 uses the oil return device, the machine oil is deposited at the bottom of the oil-gas separator filter element 2 for a long time, the filtering effect of the bottom of the oil-gas separator filter element 2 is reduced, and the deposited oil is easily taken away by the compressed air, which reduces the separation efficiency of the oil-gas separator.

[0034] In order to improve the problem that the machine oil is deposited at the bottom of the existing oil-gas separator filter element 2 for a long time and reduces the filtering effect of the bottom of the oil-gas separator filter element 2, an oil-gas separator filter element 2 oil return device is provided, which reduces the deposited machine oil at the bottom of the oil-gas separator filter element 2 and improves the filtering effect of the bottom of the oil-gas separator filter element 2. At the same time, in order to improve the problem that the deposited oil is easily taken away by the compressed air and reduces the separation efficiency of the oil-gas separator, an oil-gas separator filter element 2 oil return device is provided, which reduces the deposited machine oil at the bottom of the oil-gas separator filter element 2 and reduces the deposited machine oil taken away by the compressed air, and improves the separation efficiency of the oil-gas separator.

[0035] The oil-gas separator filter element 2 oil return device described in the above embodiment sets the oil collecting box 4 at the bottom of the oil-gas separator filter element 2, so that the deposited machine oil at the bottom of the oil-gas separator filter element 2 is collected in the oil collecting box 4 through the oil discharge port 2.1, the deposited machine oil at the bottom of the oil-gas separator filter element 2 is avoided to block the bottom of the oil-gas separator filter element 2, so as to improve the filtering effect of the bottom of the oil-gas separator filter element 2. Secondly, the oil discharge port 2.1 is small, the compressed air in the oil-gas separator filter element 2 is not easy to take away the deposited machine oil in the oil collecting box 4, the deposited machine oil is reduced to be taken away by the compressed air, and the separation efficiency of the oil-gas separator is improved.

[0036] Working principle: the outer end of the oil return pipe 3 is connected with the screw compressor, the inner end of the oil return pipe 3 passes through the oil-gas separator cylinder 1 and the oil-gas separator filter core 2 bottom to the oil collecting box 4 and is located at the bottom of the oil collecting box 4, the oil settled at the bottom of the oil collecting box 4 is discharged in time, and the problem of long-term settlement of oil at the bottom of the oil-gas separator filter core 2 is greatly improved.

[0037] Further optimization of the oil return pipe 3, as shown in Figure 1 、 Figure 2 , the oil return pipe 3 is provided with an electromagnetic valve 5 for opening and closing the oil return pipe 3, and the electromagnetic valve 5 is located outside the oil-gas separator cylinder 1. The electromagnetic valve 5 controls the opening and closing of the oil return pipe 3, prevents the filtered compressed air in the oil-gas separator filter core 2 from returning to the oil return pipe 3 together with the settled oil in the state of the oil return pipe 3 being always open, and improves the oil return rate of the oil return pipe 3.

[0038] Further optimization of the oil return pipe 3, as shown in Figure 1 、 Figure 2 、 Figure 5 , the oil return pipe 3 is provided with an oil observation mirror 6, and the oil observation mirror 6 is located outside the oil-gas separator cylinder 1. The oil observation mirror 6 is convenient for observing the oil return condition of the oil return pipe 3, and the electromagnetic valve 5 can be manually closed through the oil return condition. In the technical solution, the oil observation mirror 6 comprises a transparent body and connecting pieces arranged at both ends of the transparent body, an oil observation channel is arranged in the transparent body, the connecting pieces are connected with the oil return pipe 3 and are provided with flow channels communicating the oil return pipe 3 and the oil observation channel, and the oil observation channel is connected with the oil return pipe 3, thereby facilitating the observation of the oil return condition in the oil return pipe 3.

[0039] Further optimization of the oil discharge port 2.1, as shown in Figure 1 、 Figure 2 , the oil discharge port 2.1 of the oil-gas separator filter core 2 is connected with an oil discharge pipe 7, and the inner wall of the oil discharge pipe 7 is a conical surface with a large upper end and a small lower end. It is convenient for the oil-gas separator filter core 2 to discharge oil.

[0040] Further optimization of the oil-gas separator filter core 2, as shown in Figure 1 、 Figure 2 , the inner wall of the bottom of the oil-gas separator filter core 2 is a concave surface, and the oil discharge port 2.1 is located in the concave surface. The settled oil is deposited in the groove at the bottom of the oil-gas separator filter core 2, can smoothly enter the oil discharge port 2.1, and is convenient for the oil-gas separator filter core 2 to discharge oil.

[0041] Further optimization of the oil level control rod 8.1, as shown in Figure 1 、 Figure 2As shown, the oil level control lever 8.1 includes a vertical lever 8.1.1 and a horizontal lever 8.1.2 that fixes the upper part of the vertical lever 8.1.1 inside the oil collection box 4. The oil level sensor 8.2 is located on the vertical lever 8.1.1. The magnetic float 8.2.1 moves up and down vertically.

[0042] The solenoid valve 5 is further optimized. The solenoid valve 5 is connected to a solenoid valve 5 controller. The solenoid valve 5 controller includes a time delay relay. The solenoid valve 5 controller controls the interval action time of the solenoid valve 5 through the time delay relay.

[0043] The above embodiments have the following beneficial effects: avoiding the long-term presence of settled oil at the bottom of the oil-gas separator filter element 2, which would cause the settled oil to clog the bottom of the oil-gas separator filter element 2, thereby improving the filtration effect at the bottom of the oil-gas separator filter element 2; and reducing the amount of settled oil carried away by the compressed air in the oil collection box 4, thereby improving the separation efficiency of the oil-gas separator.

[0044] Example 2, as Figure 3 The oil return device for an oil-gas separator filter element shown includes an oil-gas separator cylinder 1 and an oil-gas separator filter element 2. The oil-gas separator cylinder 1 is provided with an oil return pipe 3 connected to a screw air compressor. The bottom of the oil-gas separator filter element 2 is provided with an oil collection box 4 and an oil outlet 2.1 connected to the oil collection box 4. The inner end of the oil return pipe 3 passes through the bottom of the oil-gas separator cylinder 1 and the oil-gas separator filter element 2 in sequence, enters the oil collection box 4, and is located at the bottom of the oil collection box 4.

[0045] In this embodiment, an oil level controller 8 is provided inside the oil collection box 4. The oil level controller 8 includes an oil level control rod 8.1 disposed inside the oil collection box 4 and an oil level sensor 8.2 disposed on the oil level control rod 8.1. The oil level controller 8 is electrically connected to the solenoid valve 5. In this technical solution, the oil level controller 8 is electrically connected to the solenoid valve 5 to realize the automatic opening and closing of the oil return device. The solenoid valve 5 is normally closed. When the oil level sensor 8.2 detects that the oil level in the oil collection box 4 exceeds the set oil level height, the oil level controller 8 controls the solenoid valve 5 to open for oil return operation; when the oil level sensor 8.2 detects that the oil level in the oil collection box 4 is lower than the set oil level height, the oil level controller 8 controls the solenoid valve 5 to close to prevent the return pipe 3 from drawing out compressed air. The oil level sensor 8.2 and the solenoid valve 5 control can both timely discharge settled oil and prevent the return pipe 3 from drawing out compressed air.

[0046] The oil level controller 8 is connected to the solenoid valve 5 by wire or wireless means. When the oil level controller 8 is wirelessly connected to the solenoid valve 5 through a control box and a transmitter, the control box and transmitter are installed on the oil collection box 4.

[0047] Specifically, the oil level sensor 8.2 includes a dry reed tube arranged in the oil level control rod 8.1 and a magnetic float ball 8.2.1 arranged in a sliding sleeve on the oil level control rod 8.1, and an upper limiting ring 8.2.2 arranged on the oil level control rod 8.1 is arranged above the magnetic float ball 8.2.1, and a lower limiting ring 8.2.3 arranged on the oil level control rod 8.1 is arranged below the magnetic float ball 8.2.1.

[0048] The oil return pipe 3 is further optimized, and an electromagnetic valve 5 for opening and closing the oil return pipe 3 is arranged on the oil return pipe 3, and the electromagnetic valve 5 is located outside the oil-gas separator cylinder 1. The electromagnetic valve 5 controls the opening and closing of the oil return pipe 3, prevents the oil return pipe 3 from returning the compressed air filtered in the oil-gas separator filter element 2 together with the sedimentation machine oil in the case of the oil return pipe 3 being always open, and improves the oil return rate of the oil return pipe 3.

[0049] The oil return pipe 3 is further optimized, and an oil observation mirror 6 is arranged on the oil return pipe 3, and the oil observation mirror 6 is located outside the oil-gas separator cylinder 1. The oil observation mirror 6 facilitates observation of the oil return condition in the oil return pipe 3, and the electromagnetic valve 5 can be manually closed through the oil return condition. In the technical solution, the oil observation mirror 6 includes a transparent body and connecting pieces arranged at two ends of the transparent body, an oil observation channel is arranged in the transparent body, the connecting pieces are connected with the oil return pipe 3 and are provided with flow channels communicating the oil return pipe 3 and the oil observation channel, and the oil observation channel is connected with the oil return pipe 3, thereby facilitating observation of the oil return condition in the oil return pipe 3.

[0050] The oil discharge port 2.1 is further optimized, and the oil discharge port 2.1 of the oil-gas separator filter element 2 is connected with an oil discharge pipe 7, and the inner wall of the oil discharge pipe 7 is a conical surface that is large at the top and small at the bottom. This facilitates oil discharge at the bottom of the oil-gas separator filter element 2.

[0051] The oil-gas separator filter element 2 is further optimized, and the inner wall at the bottom of the oil-gas separator filter element 2 is a concave surface, and the oil discharge port 2.1 is located in the concave surface. This enables the sedimentation machine oil to be deposited in the groove at the bottom of the oil-gas separator filter element 2 and smoothly enter the oil discharge port 2.1, thereby facilitating oil discharge at the bottom of the oil-gas separator filter element 2.

[0052] The oil level control rod 8.1 is further optimized, and the oil level control rod 8.1 includes a vertical rod 8.1.1 and a horizontal rod 8.1.2 for fixing the upper part of the vertical rod 8.1.1 in the oil collecting box 4, and the oil level sensor 8.2 is located on the vertical rod 8.1.1. The magnetic float ball 8.2.1 vertically rises and falls.

[0053] The electromagnetic valve 5 is further optimized, and the electromagnetic valve 5 is connected with an electromagnetic valve 5 controller, and the electromagnetic valve 5 controller includes a time delay relay, and the electromagnetic valve 5 controller controls the interval action time of the electromagnetic valve 5 through the time delay relay.

[0054] The above embodiments have the following beneficial effects: They prevent the long-term presence of settled oil at the bottom of the oil-gas separator filter element 2, thus avoiding blockage and improving the filtration efficiency of the oil-gas separator filter element 2; the compressed air inside the oil-gas separator filter element 2 is less likely to carry away the settled oil in the oil collection box 4, reducing the amount of settled oil carried away by the compressed air and improving the separation efficiency of the oil-gas separator; the oil level sensor 8.2 and the solenoid valve 5 control both timely discharge of settled oil and prevention of compressed air extraction through the return oil pipe 3.

[0055] Example 3, as Figure 4 The oil return device for an oil-gas separator filter element shown includes an oil-gas separator cylinder 1 and an oil-gas separator filter element 2. The oil-gas separator cylinder 1 is provided with an oil return pipe 3 connected to a screw air compressor. The bottom of the oil-gas separator filter element 2 is provided with an oil collection box 4 and an oil outlet 2.1 connected to the oil collection box 4. The inner end of the oil return pipe 3 passes through the bottom of the oil-gas separator cylinder 1 and the oil-gas separator filter element 2 in sequence, enters the oil collection box 4, and is located at the bottom of the oil collection box 4.

[0056] In this embodiment, an oil level controller 8 is provided inside the oil collection box 4. The oil level controller 8 includes an oil level control rod 8.1 disposed inside the oil collection box 4 and an oil level sensor 8.2 disposed on the oil level control rod 8.1. The oil level controller 8 is electrically connected to the solenoid valve 5. In this technical solution, the oil level controller 8 is electrically connected to the solenoid valve 5 to realize the automatic opening and closing of the oil return device. The solenoid valve 5 is normally closed. When the oil level sensor 8.2 detects that the oil level in the oil collection box 4 exceeds the set oil level height, the oil level controller 8 controls the solenoid valve 5 to open for oil return operation; when the oil level sensor 8.2 detects that the oil level in the oil collection box 4 is lower than the set oil level height, the oil level controller 8 controls the solenoid valve 5 to close to prevent the return pipe 3 from drawing out compressed air. The oil level sensor 8.2 and the solenoid valve 5 control can both timely discharge settled oil and prevent the return pipe 3 from drawing out compressed air.

[0057] The oil level sensor 8.2 includes a high-level sensor and a low-level sensor, with the high-level sensor located above the low-level sensor. When the oil level in the oil collection box 4 exceeds or falls below a set threshold, the oil level sensor 8.2 will trigger corresponding control and alarm signals to take appropriate measures.

[0058] The oil level controller 8 is connected to the solenoid valve 5 by wire or wireless means. When the oil level controller 8 is wirelessly connected to the solenoid valve 5 through a control box and a transmitter, the control box and transmitter are installed on the oil collection box 4.

[0059] Specifically, the oil level sensor 8.2 includes a dry reed tube arranged in the oil level control rod 8.1 and a magnetic float ball 8.2.1 arranged in a sliding sleeve on the oil level control rod 8.1, and an upper limiting ring 8.2.2 arranged on the oil level control rod 8.1 is arranged above the magnetic float ball 8.2.1, and a lower limiting ring 8.2.3 arranged on the oil level control rod 8.1 is arranged below the magnetic float ball 8.2.1.

[0060] The oil return pipe 3 is further optimized, and an electromagnetic valve 5 for opening and closing the oil return pipe 3 is arranged on the oil return pipe 3, and the electromagnetic valve 5 is located outside the oil-gas separator cylinder 1. The electromagnetic valve 5 controls the opening and closing of the oil return pipe 3, prevents the oil return pipe 3 from returning the compressed air filtered in the oil-gas separator filter element 2 together with the sedimentation machine oil in the case of the oil return pipe 3 being always open, and improves the oil return rate of the oil return pipe 3.

[0061] The oil return pipe 3 is further optimized, and an oil observation mirror 6 is arranged on the oil return pipe 3, and the oil observation mirror 6 is located outside the oil-gas separator cylinder 1. The oil observation mirror 6 facilitates observation of the oil return condition in the oil return pipe 3, and the electromagnetic valve 5 can be manually closed through the oil return condition. In the technical solution, the oil observation mirror 6 includes a transparent body and connecting pieces arranged at two ends of the transparent body, an oil observation channel is arranged in the transparent body, the connecting pieces are connected with the oil return pipe 3 and are provided with flow channels communicating the oil return pipe 3 and the oil observation channel, and the oil observation channel is connected with the oil return pipe 3, thereby facilitating observation of the oil return condition in the oil return pipe 3.

[0062] The oil discharge port 2.1 is further optimized, and the oil discharge port 2.1 of the oil-gas separator filter element 2 is connected with an oil discharge pipe 7, and the inner wall of the oil discharge pipe 7 is a conical surface that is large at the top and small at the bottom. This facilitates oil discharge at the bottom of the oil-gas separator filter element 2.

[0063] The oil-gas separator filter element 2 is further optimized, and the inner wall at the bottom of the oil-gas separator filter element 2 is a concave surface, and the oil discharge port 2.1 is located in the concave surface. This enables the sedimentation machine oil to be deposited in the concave groove at the bottom of the oil-gas separator filter element 2 and to smoothly enter the oil discharge port 2.1, thereby facilitating oil discharge at the bottom of the oil-gas separator filter element 2.

[0064] The oil level control rod 8.1 is further optimized, and the oil level control rod 8.1 includes a vertical rod 8.1.1 and a horizontal rod 8.1.2 for fixing the upper part of the vertical rod 8.1.1 in the oil collecting box 4, and the oil level sensor 8.2 is located on the vertical rod 8.1.1. The magnetic float ball 8.2.1 vertically rises and falls.

[0065] The electromagnetic valve 5 is further optimized, and the electromagnetic valve 5 is connected with an electromagnetic valve 5 controller, and the electromagnetic valve 5 controller includes a time delay relay, and the electromagnetic valve 5 controller controls the interval action time of the electromagnetic valve 5 through the time delay relay.

[0066] The above-mentioned embodiment has the following beneficial effects: avoiding the long-term existence of the settled machine oil at the bottom of the oil-gas separator filter element 2 to cause the settled machine oil to block the bottom of the oil-gas separator filter element 2, thereby improving the filtering effect of the bottom of the oil-gas separator filter element 2; the compressed air in the oil-gas separator filter element 2 is not easy to take away the settled machine oil in the oil collecting box 4, reducing the settled machine oil taken away by the compressed air, and improving the separation efficiency of the oil-gas separator; the oil level sensor 8.2 and the electromagnetic valve 5 control can not only timely discharge the settled machine oil, but also prevent the compressed air from being extracted by the oil return pipe 3.

[0067] The above-mentioned specific embodiments are only the preferred embodiments of the utility model, and are not intended to limit the specific implementation range of the utility model. Any equivalent changes made in accordance with the shape and structure of the utility model should be included in the protection scope of the utility model.

Claims

1. An oil return device for an oil-gas separator filter element, comprising an oil-gas separator cylinder and an oil-gas separator filter element, the oil-gas separator cylinder being provided with an oil return pipe connected to a screw air compressor, characterized in that, The oil-gas separator filter core bottom is provided with an oil collecting box and an oil discharge port communicated with the oil collecting box, and the inner end of the oil return pipe passes through the oil-gas separator cylinder and the oil-gas separator filter core bottom in sequence and enters the oil collecting box and is located at the bottom of the oil collecting box.

2. The oil return device for an oil and gas separator filter cartridge according to claim 1, characterized by, The oil return pipe is provided with an electromagnetic valve for opening and closing the oil return pipe, and the electromagnetic valve is located outside the oil-gas separator cylinder.

3. The oil return device for an oil and gas separator filter cartridge according to claim 2, characterized by, The oil return pipe is provided with an oil viewing mirror, and the oil viewing mirror is located outside the oil-gas separator cylinder.

4. The oil return device for an oil and gas separator cartridge according to claim 1 or 2 or 3, characterized by, The oil discharge port of the oil-gas separator filter core is connected with an oil discharge pipe, and the inner wall of the oil discharge pipe is a conical surface with a large upper part and a small lower part.

5. The oil return device for an oil and gas separator cartridge according to claim 1 or 2 or 3, characterized by, The inner wall of the bottom of the oil-gas separator filter core is a concave surface, and the oil discharge port is located in the concave surface.

6. The oil return device for an oil and gas separator cartridge according to claim 2 or 3, characterized by The oil collecting box is provided with an oil level controller, which includes an oil level control rod arranged in the oil collecting box and an oil level sensor arranged on the oil level control rod, and the oil level controller is electrically connected with the electromagnetic valve.

7. The oil return device for an oil and gas separator cartridge according to claim 6, characterized by The oil level sensor includes a dry reed tube arranged in the oil level control rod and a magnetic floating ball sleeved on the oil level control rod, an upper limit ring arranged on the oil level control rod is arranged above the magnetic floating ball, and a lower limit ring arranged on the oil level control rod is arranged below the magnetic floating ball.

8. The oil return device for an oil and gas separator filter cartridge according to claim 6, characterized by, The oil level sensor includes a high-level sensor and a low-level sensor, and the high-level sensor is located above the low-level sensor.

9. The oil return device for an oil and gas separator filter cartridge according to claim 6, characterized by, The oil level control rod includes a vertical rod and a horizontal rod for fixing the upper part of the vertical rod in the oil collecting box, and the oil level sensor is located on the vertical rod.

10. The oil return device for an oil and gas separator cartridge according to claim 2 or 3, characterized by The electromagnetic valve is connected with an electromagnetic valve controller, the electromagnetic valve controller includes a time delay relay, and the electromagnetic valve controller controls the interval action time of the electromagnetic valve through the time delay relay.

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