Low-load refrigeration dryer with oil return protection mechanism

Abstract

The utility model discloses a low-load refrigeration dryer with an oil return protection mechanism, which comprises a variable-frequency compressor, a heat exchanger connected with an input port of the variable-frequency compressor and a condenser connected with an output port of the variable-frequency compressor, and an output port of the condenser is connected with an input port of the heat exchanger. By controlling opening / closing of the oil discharge port and the oil delivery port, backflow and supplement of lubricating oil can be controlled at a proper time. When the compressor works at low frequency, the control switch is driven through the timing module, part of lubricating oil is discharged, and the same amount of new lubricating oil is supplemented through the oil conveying port. Therefore, the problem of lubricating oil aging or insufficient flow can be effectively prevented, and stable work of the system is maintained.

Description

TECHNICAL FIELD

[0001] The utility model relates to a low-load cold dryer with oil return protection mechanism and belongs to the technical field of cold dryers. BACKGROUND

[0002] A cold dryer is a device used for compressed air treatment, mainly used for removing moisture in the air. It cools the compressed air to condense water vapor in the air into water droplets, and then removes the moisture through a separator to ensure the dryness of the compressed air. Cold dryers are commonly used in various industrial fields, such as pneumatic equipment, automation equipment, and other systems that require dry air.

[0003] With the application of variable frequency compressor technology, the operating efficiency and energy efficiency of the cold dryer have been improved. However, when the variable frequency compressor works at low frequency, there is a problem of difficulty in returning lubricating oil. The reason is that when the variable frequency compressor works at low frequency, the gas flow inside the compressor is small, which causes the lubricating oil to be unable to fully return to the oil pool. This phenomenon will gradually worsen during long-term low-frequency operation, thereby affecting the lubrication effect.

[0004] In addition, as the running time of the equipment increases, the aging process of the lubricating oil will also intensify. The aging of the lubricating oil will cause changes in its viscosity and a decrease in its lubrication performance, further exacerbating the difficulty of returning the lubricating oil. This not only increases the friction inside the compressor, but also may cause problems such as overheating of the system and mechanical damage, thereby affecting the overall performance and lifespan of the cold dryer.

[0005] Therefore, it is necessary to design a low-load cold dryer that can solve the problem of difficulty in returning lubricating oil when the variable frequency compressor works at low frequency for a long time. SUMMARY

[0006] In view of the deficiencies of the prior art, the utility model aims to provide a low-load cold dryer with an oil return protection mechanism to solve the problems of the prior art.

[0007] To achieve the above-mentioned purpose, the utility model is implemented by the following technical solutions:

[0008] A low-load cold dryer with an oil return protection mechanism, comprising: a variable frequency compressor, a heat exchanger connected to the input port of the variable frequency compressor, and a condenser connected to the output port of the variable frequency compressor, wherein the output port of the condenser is connected to the input port of the heat exchanger.

[0009] The variable frequency compressor is equipped with an oil return replenishment component, which includes an oil separator located on one side of the variable frequency compressor, an oil return pipe connected to the oil separator to return lubricating oil to the inside of the variable frequency compressor, an oil discharge port located in the direction of input to the oil return pipe, an oil supply port located in the direction of output to the oil return pipe, a first control switch for controlling the opening / closing of the oil discharge port, and a second control switch for controlling the opening / closing of the oil supply port. The oil discharge port is connected to an external recovery pipe through the first control switch, and the oil supply port is connected to an external oil supply pipe through the second control switch.

[0010] The control module and the timing module are electrically connected to the first control switch, the second control switch, and the variable frequency compressor.

[0011] The control module, in conjunction with the timing module, controls the frequency-increasing operation of the low-frequency variable frequency compressor for a preset time.

[0012] The control module, in conjunction with the timing module, drives the first control switch to open for a preset time, thereby connecting the oil drain port to the external recovery pipe and discharging a portion of the lubricating oil.

[0013] The control module, in conjunction with the timing module, synchronously controls the second control switch to open for a preset time, thereby connecting the oil outlet to the external oil supply pipeline and inputting an equal amount of lubricating oil.

[0014] As a further improvement, the oil drain port is located below the oil return pipe.

[0015] As a further improvement, the oil inlet is located above the return oil pipe.

[0016] As a further improvement, both the first control switch and the second control switch are solenoid valves.

[0017] As a further improvement, the first control switch includes a first baffle that is rotatably installed inside the return oil pipe, and a first drive motor that drives the first baffle to rotate. The first drive motor is electrically connected to the control module, and the first baffle is controlled to rotate to open / close.

[0018] As a further improvement, the opening direction of the first baffle is set towards the input direction of the return oil pipe.

[0019] As a further improvement, the first baffle rotates at an angle of 20-30°.

[0020] As a further improvement, the second control switch comprises a second baffle plate rotatably installed inside the oil return pipe, and a second drive motor driving the rotation of the second baffle plate, the second drive motor being electrically connected with the control module, and the rotation of the second baffle plate being controlled by the second drive motor to open / close.

[0021] As a further improvement, the opening direction of the second baffle plate is set towards the output direction of the oil return pipe.

[0022] As a further improvement, the rotation angle of the second baffle plate is 25-35°.

[0023] Advantages:

[0024] The utility model discloses a control switch for opening / closing the oil discharge port and the oil inlet port, which can control the backflow and replenishment of lubricating oil at appropriate times. When the compressor is working at low frequency, the control switch is driven by the timing module to discharge part of the lubricating oil and replenish an equal amount of new lubricating oil through the oil inlet port. This can effectively prevent the problems of lubricating oil aging or insufficient flow, thereby maintaining the stable operation of the system.

[0025] The timing module cooperates with the control module to accurately control the frequency increase operation time of the low-frequency compressor. Through the preset time interval, the mechanism automatically drives the discharge and replenishment of lubricating oil, effectively monitors and adjusts the state of the lubricating oil, and avoids insufficient lubrication caused by long-time low-frequency operation.

[0026] In the prior art, the lubricating oil of the variable frequency compressor working at low frequency cannot flow back smoothly due to insufficient airflow. However, the present scheme solves this problem through the design of the oil return and replenishment assembly and the oil separator, ensuring the stable backflow of the lubricating oil.

[0027] Through the combination of the timing module and the control module, the discharge and replenishment of lubricating oil are automatically adjusted, so that the lubrication state of the system is always optimal. Compared with the traditional manual adjustment method, this automatic control greatly improves the operation efficiency and reliability.

[0028] Through periodic discharge and replenishment of lubricating oil, the aging process of lubricating oil can be effectively slowed down, the risk of oil viscosity change can be reduced, the service life of the compressor can be prolonged, and the failure of the equipment caused by insufficient lubrication can be reduced.

[0029] The innovative oil return protection mechanism solves the problem of lubricating oil return difficulty of the variable frequency compressor working at low frequency, ensures the lubrication effect of the compressor during long-time low-frequency operation, and improves the operation efficiency, stability and service life of the equipment. Compared with the prior art, it has obvious advantages such as automatic control, efficient oil return and reduced oil aging. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be considered as limiting the scope. For those skilled in the art, other related drawings can be obtained without creative labor on the basis of these drawings.

[0031] Figure 1 is a side view structural schematic diagram of a low-load cold dryer with an oil return protection mechanism according to the present application.

[0032] Figure 2 is a partial enlarged structural schematic diagram of an oil return pipe of a variable frequency compressor according to the present application.

[0033] Figure 3 is a module control schematic diagram of a low-load cold dryer with an oil return protection mechanism according to the present application.

[0034] Figure 4 is a partial enlarged structural schematic diagram of an oil return supplement assembly of another embodiment of an oil return pipe according to the present application.

[0035] 1, variable frequency compressor; 2, heat exchanger; 3, condenser; 4, oil separator; 5, oil return pipe; 6, control module; 7, timing module; 51, oil discharge port; 52, oil inlet; 53, first control switch; 54, second control switch; 531, first baffle; 532, first drive motor; 541, second baffle; 542, second drive motor. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only to represent selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0037] In the description of the utility model, the terms "first", "second" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.

[0038] Embodiment 1

[0039] Referring to Figures 1-3 As shown in the figure, a low-load cold dryer with oil return protection mechanism, comprising: frequency conversion compressor 1, heat exchanger 2 connected with the input port of the frequency conversion compressor 1, condenser 3 connected with the output port of the frequency conversion compressor 1, the output port of the condenser 3 is connected with the input port of the heat exchanger 2.

[0040] The frequency conversion compressor 1 is provided with an oil return supplement assembly, the oil return supplement assembly comprises an oil separator 4 arranged on one side of the frequency conversion compressor 1, an oil return pipe 5 connected with the oil separator 4 and returning the lubricating oil to the inside of the frequency conversion compressor 1, an oil discharge port 51 arranged in the input direction of the oil return pipe 5, an oil inlet port 52 arranged in the output direction of the oil return pipe 5, a first control switch 53 for controlling the opening / closing of the oil discharge port 51, a second control switch 54 for controlling the opening / closing of the oil inlet port 52, the oil discharge port 51 is connected with the external recovery pipeline through the first control switch 53, and the oil inlet port 52 is connected with the external oil supply pipeline through the second control switch 54.

[0041] The control module 6 is connected with the timing module 7, and the control module 6 is electrically connected with the first control switch 53, the second control switch 54 and the frequency conversion compressor 1.

[0042] The control module 6 cooperates with the timing module 7 to control the frequency conversion compressor 1 to work at a preset frequency for a preset time.

[0043] The control module 6 cooperates with the timing module 7 to drive the first control switch 53 to open for a preset time, control the oil discharge port 51 to be communicated with the external recovery pipeline, and discharge part of the lubricating oil.

[0044] The control module 6 cooperates with the timing module 7 to synchronously control the second control switch 54 to open for a preset time, control the oil discharge port 51 to be communicated with the external oil supply pipeline, and input an equal amount of lubricating oil.

[0045] The variable frequency compressor 1 is equipped with an oil return supplement assembly, which includes an oil separator 4 and an oil return pipe 5. The oil separator 4 can effectively separate the lubricating oil in the compressed air and return the separated lubricating oil to the inside of the variable frequency compressor 1 through the oil return pipe 5, ensuring that the lubricating oil does not stagnate due to insufficient airflow during low-frequency operation.

[0046] By controlling the opening / closing of the oil discharge port 51 and the oil supply port 52, the return and supplement of lubricating oil can be controlled at the appropriate time. When the compressor operates at low frequency, the control switch is driven by the timing module 7 to discharge part of the lubricating oil and supplement an equal amount of new lubricating oil through the oil supply port 52. This effectively prevents the problem of lubricating oil aging or insufficient flow, thereby maintaining the stable operation of the system.

[0047] The timing module 7 precisely controls the frequency increase operation time of the low-frequency compressor by cooperating with the control module 6. This mechanism automatically drives the discharge and supplement of lubricating oil at a preset time interval, effectively monitors and adjusts the state of the lubricating oil, and avoids the problem of insufficient lubrication caused by long-term low-frequency operation.

[0048] In the prior art, the variable frequency compressor 1 operating at low frequency is prone to cause lubricating oil to fail to return smoothly due to insufficient airflow. However, the present scheme solves this problem through the design of the oil return supplement assembly and the oil separator 4, ensuring the stable return of lubricating oil.

[0049] Through the combination of the timing module 7 and the control module 6, the discharge and supplement of lubricating oil are automatically adjusted, so that the lubrication state of the system is always optimal. Compared with the traditional manual adjustment method, this automatic control greatly improves the operation efficiency and reliability.

[0050] By periodically discharging and supplementing lubricating oil, the aging process of lubricating oil can be effectively slowed down, the risk of oil viscosity change can be reduced, the service life of the compressor can be prolonged, and the failure of the equipment caused by insufficient lubrication can be reduced.

[0051] The innovative oil return protection mechanism solves the problem of lubricating oil return difficulty of the variable frequency compressor 1 during low-frequency operation, ensures the lubrication effect of the compressor during long-term low-frequency operation, and improves the operation efficiency, stability and service life of the equipment. At the same time, compared with the prior art, it has obvious advantages such as automatic control, efficient oil return and reduction of oil aging.

[0052] The oil discharge port 51 is arranged below the oil return pipe 5. The oil supply port 52 is arranged above the oil return pipe 5.

[0053] The first control switch 53 and the second control switch 54 are both electromagnetic valves.

[0054] By setting the oil discharge port 51 below the oil return pipe 5, it helps to ensure that the lubricating oil can be smoothly discharged by gravity, avoiding the situation that the lubricating oil is stagnant due to insufficient gas pressure or poor pipeline in the oil return pipe 5. This design utilizes the natural physical principle, making the oil liquid can be effectively discharged without relying on external force, ensuring that the lubricating oil can be discharged from the system in time, preventing the aging and accumulation of lubricating oil.

[0055] By setting the oil inlet port 52 above the oil return pipe 5, it ensures that the replenishment of lubricating oil will not mix with the discharged oil, avoiding cross contamination of oil products, ensuring that the new oil is clean and pure when entering the system, thereby maintaining the quality of lubricating oil.

[0056] In addition, the main reason for choosing electromagnetic valve as the first and second control switch 54 is its high precision, fast response and reliability. The electromagnetic valve can accurately control the opening and closing of the oil discharge port 51 and the oil inlet port 52 through electrical signals, ensuring that the discharge and replenishment of lubricating oil are carried out within the set time.

[0057] Through the electromagnetic valve, the instructions of the control module 6 can be quickly and accurately executed, thereby realizing the automatic management of the return and replenishment of lubricating oil. Compared with traditional mechanical valves, the electromagnetic valve does not require manual intervention and can be automatically adjusted according to the preset time of the timing module 7, ensuring that the lubricating oil is always maintained in the best state.

[0058] Embodiment 2

[0059] Referring to Figure 4 The embodiment is basically the same as embodiment 1, the difference is that the first control switch 53 includes a first baffle 531 rotatably installed inside the oil return pipe 5, and a first drive motor 532 driving the first baffle 531 to rotate, the first drive motor 532 is electrically connected with the control module 6, and the first baffle 531 is controlled to rotate open / close through the first drive motor 532.

[0060] Because the opening direction of the first baffle 531 is set towards the input direction of the oil return pipe 5.

[0061] When the lubricating oil flows, it will actively impact the first baffle 531, so the impact force will try to open the first baffle 531 as much as possible, so the rotation angle of the first baffle 531 is set to 20-30°.

[0062] The opening angle of the first baffle 531 directly affects the channel width of the lubricating oil flow, and the angle of 20-30° can effectively adjust the flow of the oil flow in the oil return pipe 5, ensuring the stability and control accuracy of the oil flow in the oil return pipe 5 under different working conditions.

[0063] Since the lubricating oil will actively impact the baffle when flowing, setting the angle of the baffle to 20-30° can effectively reduce the backwash force of the oil flow on the baffle, avoid the baffle from being unable to normally open or close due to excessive or insufficient oil flow, and ensure the safety and stability of the equipment operation.

[0064] The appropriate baffle opening angle can ensure that the oil flow is not excessively restricted, while also not causing excessive flow, thereby improving the overall operating efficiency of the system, reducing energy loss, and ensuring efficient operation of the lubrication system.

[0065] The second control switch 54 includes a second baffle 541 rotatably installed inside the oil return pipe 5, and a second drive motor 542 driving the second baffle 541 to rotate, the second drive motor 542 being electrically connected with the control module 6, and the second baffle 541 being controlled to rotate to open / close through the second drive motor 542.

[0066] Since the opening direction of the second baffle 541 is towards the output direction of the oil return pipe 5, when the lubricating oil flows, it impacts the back of the second baffle 541. In the open state of the second baffle 541, the back is impacted, and the opening angle is easily affected, thereby reducing the opening range. Therefore, the rotation angle of the second baffle 541 is 25-35°.

[0067] Since the opening direction of the second baffle 541 is towards the output direction of the oil return pipe 5, when the lubricating oil flows, it impacts the back of the second baffle 541. If the baffle angle is set too large, the impact force of the oil flow may cause the baffle angle to be unstable or the opening range to be reduced, affecting the oil flow control of the system. Setting the rotation angle to 25-35° can ensure that the baffle can maintain a stable open state under the impact of the oil flow, avoiding changes in the angle caused by excessive opening.

[0068] Through the appropriate rotation angle (25-35°), the second baffle 541 can neither be excessively pushed by the oil flow, causing it to be unable to fully close, nor be effectively opened to a sufficient angle, ensuring smooth flow of the lubricating oil. This angle setting makes the oil flow control more precise, improving the overall efficiency of the oil return pipe 5 system.

[0069] Through the setting of the baffle angle, the second baffle 541 can maintain a relatively stable open state under various operating conditions, ensuring the smoothness and constancy of the lubricating oil flow, thereby improving the overall stability and reliability of the system.

[0070] It should be noted that the device structure and accompanying drawings of this utility model mainly describe the principle of this utility model. In terms of the technical aspects of this design principle, the setting of the power mechanism, power supply system and control system of the device is not fully described. However, under the premise that those skilled in the art understand the principle of the above utility model, the specific details of its power mechanism, power supply system and control system can be clearly understood. The control method in the application document is automatic control through a controller. The control circuit of the controller can be implemented by those skilled in the art through simple programming.

[0071] All standard parts used can be purchased from the market, and can be customized according to the instructions and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the existing technology. The machinery, parts and equipment adopt conventional models in the existing technology, and the structure and principle of the components known to those skilled in the art can be known by those skilled in the art through technical manuals or conventional experimental methods.

[0072] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A low load cold dryer with oil return protection mechanism, characterized in that, The application relates to a variable-frequency compressor (1), a heat exchanger (2) connected with the input port of the variable-frequency compressor (1), and a condenser (3) connected with the output port of the variable-frequency compressor (1), wherein the output port of the condenser (3) is connected with the input port of the heat exchanger (2). An oil return supplement assembly is arranged on the variable-frequency compressor (1), the oil return supplement assembly comprises an oil separator (4) arranged on one side of the variable-frequency compressor (1), an oil return pipe (5) connected with the oil separator (4) and used for returning lubricating oil into the variable-frequency compressor (1), an oil discharge port (51) arranged in the input direction of the oil return pipe (5), an oil input port (52) arranged in the output direction of the oil return pipe (5), a first control switch (53) used for controlling the opening and closing of the oil discharge port (51), a second control switch (54) used for controlling the opening and closing of the oil input port (52), the oil discharge port (51) is connected with an external recovery pipeline through the first control switch (53), and the oil input port (52) is connected with an external oil supply pipeline through the second control switch (54). A control module (6) and a timing module (7) are arranged, the control module (6) is electrically connected with the first control switch (53), the second control switch (54) and the variable-frequency compressor (1). The control module (6) is used for cooperating with the timing module (7) to control the variable-frequency compressor (1) to work at a high frequency for a preset time when the variable-frequency compressor (1) works at a low frequency. The control module (6) is used for cooperating with the timing module (7) to drive the first control switch (53) to be opened for a preset time, so that the oil discharge port (51) is connected with the external recovery pipeline to discharge part of the lubricating oil. The control module (6) is used for cooperating with the timing module (7) to synchronously control the second control switch (54) to be opened for a preset time, so that the oil discharge port (51) is connected with the external oil supply pipeline to input equal amount of lubricating oil. The oil discharge port (51) is arranged below the oil return pipe (5).

2. The low load cold dryer with oil return protection mechanism of claim 1, wherein: The oil input port (52) is arranged above the oil return pipe (5).

3. The low load cold dryer with oil return protection mechanism of claim 2, wherein: The first control switch (53) and the second control switch (54) are both electromagnetic valves.

4. The low-load cold dryer with oil return protection mechanism according to claim 1 or 3, characterized in that: The first control switch (53) comprises a first baffle (531) rotatably arranged in the oil return pipe (5) and a first driving motor (532) used for driving the first baffle (531) to rotate, the first driving motor (532) is electrically connected with the control module (6), and the first driving motor (532) is used for controlling the first baffle (531) to rotate to be opened or closed.

5. The low-load cold dryer with oil return protection mechanism according to claim 1 or 3, characterized in that: The opening direction of the first baffle (531) is arranged in the input direction of the oil return pipe (5).

6. The low load cold dryer with oil return protection mechanism of claim 5, wherein: The rotating angle of the first baffle (531) is 20-30 degrees.

7. The low load cold dryer with oil return protection mechanism of claim 6, wherein: ​ 8. The low-load cold dryer with oil return protection mechanism according to claim 1 or 7, characterized in that: The second control switch (54) comprises a second baffle (541) rotatably installed inside the oil return pipe (5) and a second driving motor (542) for driving the second baffle (541) to rotate, the second driving motor (542) being electrically connected with the control module (6) and the second baffle (541) being controlled to rotate to open / close by the second driving motor (542).

9. The low load cold dryer with oil return protection mechanism of claim 8, wherein: The opening direction of the second baffle (541) is arranged towards the output direction of the oil return pipe (5).

10. The low load cold dryer with oil return protection mechanism of claim 9, wherein: The rotation angle of the second baffle (541) is 25-35°.

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