Oil level sensor for compressor and compressor

Abstract

The invention relates to the technical field of compressors, in particular to an oil level sensor for a compressor and the compressor, the oil level sensor for the compressor structurally comprises an insulating main body and an oil discharge pipe communicated with the compressor, and the insulating main body is located above a lower oil pool of the compressor; the external terminal is installed on a shell of the compressor, a first conductive contact and a second conductive contact are arranged on the insulating main body, and the external terminal is connected with the first conductive contact and the second conductive contact through wires respectively; the conductive plate is movably mounted on the insulating main body, and when the conductive plate moves to a preset position, the conductive plate is in contact with the first conductive contact and the second conductive contact; and a reset part which is installed on the insulation main body. According to the oil level sensor for the compressor and the compressor, the problem that an existing compressor is difficult to effectively protect when oil shortage occurs can be solved.

Description

Technical Field

[0001] The present application relates to the technical field of compressors, and in particular to an oil level sensor for a compressor and a compressor. Background Art

[0002] The air-conditioning compressor has high requirements for oil lubrication during operation, and it must ensure that it maintains good lubrication performance throughout the complete oil supply cycle.

[0003] However, due to cost constraints and structural complexity, most compressors on the market do not come standard with oil level sensors. This results in the compressor being unable to effectively protect itself from oil shortages during operation, potentially leading to equipment damage. Due to the high cost of compressor replacement, such failures significantly increase the cost of air conditioning system repairs.

[0004] Even though a small number of compressors are equipped with oil level switches, they currently primarily use float-type oil level switches. These devices are not only complex in structure and expensive to manufacture, but also have limitations such as susceptibility to operating interference and limited measurement accuracy, making them difficult to effectively protect compressors. Summary of the Invention

[0005] In view of this, the purpose of the present application is to provide an oil level sensor and a compressor for a compressor, so as to solve the problem that the existing compressor is difficult to be effectively protected when there is an oil shortage.

[0006] According to a first aspect of the present invention, an oil level sensor for a compressor is provided, wherein the oil level sensor for the compressor comprises: an insulating body connected to an oil drain pipe of the compressor, the insulating body being located above a lower oil pool of the compressor; an external terminal mounted on a housing of the compressor, the insulating body being provided with a first conductive contact and a second conductive contact, the external terminal being connected to the first conductive contact and the second conductive contact respectively via a wire; a conductive plate movably mounted on the insulating body, wherein when the conductive plate moves to a preset position, the conductive plate contacts the first conductive contact and the second conductive contact; and a reset portion mounted on the insulating body, wherein the oil discharged from the oil drain pipe can drive the conductive plate to move in a direction away from the preset position, and when the oil discharged from the oil drain pipe is insufficient, the reset portion can drive the conductive plate to move in a direction close to the preset position.

[0007] Preferably, the insulating body includes a top plate portion, which is installed on the port of the oil drain pipe. A plurality of oil passage ports are opened on the top plate portion, and the oil discharged from the oil drain pipe flows through the oil passage ports. The first conductive contact and the second conductive contact are installed on the top plate portion.

[0008] Preferably, the reset part includes: an insulating slide rail, which is passed through the conductive plate, the top end of the insulating slide rail is connected to the middle of the top plate, and the conductive plate moves along the insulating slide rail; a limiting bottom plate, which is arranged at the bottom end of the insulating slide rail; and a reset spring, which is sleeved on the insulating slide rail, the top end of the reset spring abuts against the bottom surface of the conductive plate, and the bottom end of the reset spring abuts against the top surface of the limiting bottom plate.

[0009] Preferably, the insulating body further includes a side plate portion, the side plate portion is connected to the outer periphery of the top plate portion, the side plate portion is arranged around the outer periphery of the insulating slide rail, and a flow gap for oil flow is provided between the conductive plate and the side plate portion.

[0010] Preferably, an annular convex edge is formed on the upper surface of the top plate portion, and the annular convex edge is arranged around the outer periphery of the port of the oil drain pipe, and the oil outlet is arranged directly below the port of the oil drain pipe.

[0011] Preferably, the first conductive contact and the second conductive contact are vertically arranged in the top plate portion, the top ends of the first conductive contact and the second conductive contact are respectively connected to the external terminals through wires, and the bottom ends of the first conductive contact and the second conductive contact can simultaneously contact the top surface of the conductive plate.

[0012] Preferably, the cross-sectional area of the conductive plate is 1.5 to 2 times the flow area of the oil drain pipe, and the cross-sectional area of the flow gap is 1 / 2 to 3 / 4 times the flow area of the oil drain pipe.

[0013] Preferably, the oil level sensor for the compressor also includes a current detection part, which is arranged outside the shell, and the external terminal is passed through the shell. The current detection part is conductively connected to the external terminal, and the first conductive contact and the second conductive contact can be conductively connected to the conductive plate through oil.

[0014] According to a second aspect of the present invention, a compressor is provided, wherein the compressor includes the oil level sensor for the compressor as described above.

[0015] Preferably, the compressor further includes: a shell, the wiring contacts of the external terminal are arranged inside the shell, and the external terminal is partially exposed to the outside of the shell; a lower oil tank, arranged at the lower part of the shell; an upper oil tank, arranged at the upper part of the shell; an oil pump, arranged in the lower oil tank; an oil suction pipe, the bottom end of the oil suction pipe is connected to the oil pump, and the top end of the oil suction pipe is connected to the upper oil tank, and the oil in the lower oil tank can flow to the upper oil tank through the oil suction pipe; and an oil drain pipe, the top end of the oil drain pipe is connected to the upper oil tank, and the bottom end of the oil drain pipe is connected to the oil level sensor for the compressor, and the oil in the upper oil tank can flow to the lower oil tank through the oil drain pipe and the oil level sensor for the compressor.

[0016] The oil level sensor and compressor for the compressor according to the embodiment of the present invention have an insulating body connected to the oil drain pipe of the compressor, and the oil drain pipe is connected to the upper oil tank. The insulating body is located above the lower oil tank of the compressor, so that the oil flowing out of the insulating body can flow back to the lower oil tank. The external terminal is installed on the shell of the compressor, and the insulating body is provided with a first conductive contact and a second conductive contact. The external terminal is connected to the first conductive contact and the second conductive contact respectively by a wire. When the first conductive contact and the second conductive contact are conductive, a current can be generated at the external terminal. At this time, the resistance between the first conductive contact and the second conductive contact can be determined according to the magnitude of the current. The conductive plate is movably installed on the insulating body. When the conductive plate moves to a preset position, the conductive plate contacts the first conductive contact and the second conductive contact. At this time, the first conductive contact and the second conductive contact are directly conductive through the conductive plate. The reset part is installed on the insulating body, and the oil discharged from the oil drain pipe can drive the conductive plate to move in a direction away from the preset position. When the oil discharged from the oil drain pipe is insufficient, the reset part can drive the conductive plate to move in a direction close to the preset position.

[0017] This arrangement allows the conductive plate to move away from the preset position when the upper oil reservoir is sufficiently liquid. At this point, the first and second conductive contacts are electrically connected through the oil and the conductive plate, resulting in a high resistance between them and a low current at the external terminal. If the upper oil reservoir is insufficient, the reset unit drives the conductive plate toward the preset position. Ultimately, the first and second conductive contacts are electrically connected through the conductive plate, resulting in a low resistance between them and a high current at the external terminal. This allows the operator to determine whether the compressor's upper oil reservoir is sufficiently liquid, allowing them to replenish the oil promptly. Furthermore, when the oil contains a high concentration of refrigerant or other impurities, its resistance decreases, allowing the current at the external terminal to determine the oil's purity. This effectively addresses the issue of existing compressors being difficult to protect against oil shortages.

[0018] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a schematic diagram of a compressor and an oil level sensor for the compressor according to the present invention when the oil is sufficient.

[0021] Figure 2 It is a schematic diagram of a compressor and an oil level sensor for the compressor according to the present invention when the oil is insufficient.

[0022] Figure 3 According to the present invention Figure 1 A partial schematic diagram of .

[0023] Figure 4 According to the present invention Figure 2 A partial schematic diagram of .

[0024] Figure 5 FIG. 1 is a schematic diagram of a current detection portion of an oil level sensor for a compressor according to the present invention when the oil level is sufficient.

[0025] Figure numerals: 1-insulating body; 10-top plate; 100-oil outlet; 101-annular ridge; 11-side plate; 2-conductive plate; 20-circulation gap; 3-reset portion; 31-insulating slide rail; 32-limiting bottom plate; 33-reset spring; 4-external terminal; 40-wiring contact; 50-conducting wire; 51-first conductive contact; 52-second conductive contact; 61-housing; 62-lower oil pool; 63-upper oil pool; 64-oil suction pipe; 65-oil discharge pipe; 66-oil pump; 7-current detection unit; 71-power supply; 72-current protection component; 73-current detection component. DETAILED DESCRIPTION

[0026] The following detailed description is provided to help the reader gain a comprehensive understanding of the methods, devices, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent upon understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein. Rather, except for operations that must occur in a particular order, changes may be made that will be apparent upon understanding the disclosure of this application. Furthermore, descriptions of features known in the art may be omitted for clarity and brevity.

[0027] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many possible ways to implement the methods, devices, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0028] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, it may be directly “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on,” “directly connected to,” “directly coupled to,” “directly over,” or “directly covering” another element, there may be no other elements present between them.

[0029] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0030] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are used only to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Thus, a first member, component, region, layer, or portion in the examples described herein may also be referred to as a second member, component, region, layer, or portion without departing from the teachings of the examples.

[0031] For ease of description, spatially relative terms such as "above," "upper," "below," and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatially relative terms are intended to encompass different orientations of the device in use or operation, in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element would subsequently be located "below" or "lower" relative to the other element. Thus, the term "above" encompasses both the orientations of "above" and "below," depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used herein will be interpreted accordingly.

[0032] The terms used herein are intended to describe various examples only and are not intended to limit the examples. Unless the context clearly indicates otherwise, the singular form is intended to include the plural form. The terms "include," "comprising," and "having" list the presence of stated features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0033] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include changes in shapes that occur during manufacturing.

[0034] The features of the examples described herein can be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0035] like Figures 1 to 5 As shown, according to a first aspect of the present invention, an oil level sensor for a compressor is provided. The oil level sensor for a compressor includes an insulating body 1 , an external terminal 4 , a conductive plate 2 and a reset portion 3 .

[0036] In the following description, reference will be made to Figures 1 to 5 The specific structure of the above components of the oil level sensor for the compressor and the connection relationship of the above components are described in detail.

[0037] like Figures 1 to 5As shown, in an embodiment, the insulating body 1 can be connected to the oil drain pipe 65 of the compressor, and the oil drain pipe 65 can be connected to the upper oil pool 63 of the compressor. The insulating body 1 is located above the lower oil pool 62 of the compressor, so that the oil flowing out of the insulating body 1 can flow back to the lower oil pool 62. The external terminal 4 can be installed on the shell 61 of the compressor. A first conductive contact 51 and a second conductive contact 52 can be provided on the insulating body 1, and the external terminal 4 can be connected to the first conductive contact 51 and the second conductive contact 52 through a wire 50 respectively. When the first conductive contact 51 and the second conductive contact 52 are conductive, a current can be generated at the external terminal 4. At this time, the resistance between the first conductive contact 51 and the second conductive contact 52 can be judged according to the magnitude of the current. The conductive plate 2 is movably installed on the insulating body 1. When the conductive plate 2 moves to a preset position (which can be as shown in FIG. Figure 4 When the conductive plate 2 is positioned as shown in FIG, the conductive plate 2 contacts the first conductive contact 51 and the second conductive contact 52. At this point, the first conductive contact 51 and the second conductive contact 52 are directly electrically connected via the conductive plate 2. The reset portion 3 can be mounted on the insulating body 1. The oil discharged from the oil drain pipe 65 can drive the conductive plate 2 away from the preset position. When the oil discharged from the oil drain pipe 65 is insufficient, the reset portion 3 can drive the conductive plate 2 toward the preset position.

[0038] This arrangement allows the oil drained from the oil drain pipe 65 to drive the conductive plate 2 away from the preset position when the upper oil reservoir 63 is sufficiently filled with oil. In this situation, the first conductive contact 51 and the second conductive contact 52 are electrically connected through the oil and the conductive plate 2. The resistance between the first and second conductive contacts 51, 52 is high, and the current at the external terminal 4 is low.

[0039] If the upper oil reservoir 63 is low on oil, the reset unit 3 drives the conductive plate 2 toward the preset position. Ultimately, the first conductive contact 51 and the second conductive contact 52 are electrically connected via the conductive plate 2. In this situation, the resistance between the first and second conductive contacts 51, 52 is low, and the current flowing through the external terminal 4 is high. Therefore, the current flowing through the external terminal 4 can be used to determine whether the compressor's upper oil reservoir 63 is sufficiently oily, allowing the operator to replenish the oil promptly and prevent damage to the compressor due to oil shortage.

[0040] Preferably, Figures 1 to 4As shown, in an embodiment, the insulating body 1 may include a top plate portion 10, and the top plate portion 10 may be a circular plate. The top plate portion 10 may be fixedly mounted on the port of the oil drain pipe 65. A plurality of oil passages 100 may be provided on the top plate portion 10, so that the oil discharged from the oil drain pipe 65 flows downward through the oil passages 100. Preferably, the number of the oil passages 100 may be multiple, so that the oil can flow more evenly. The first conductive contact 51 and the second conductive contact 52 may be mounted on the top plate portion 10. The insulating body 1 may be made of insulating materials such as ceramic or rubber to avoid direct conduction between the first conductive contact 51 and the second conductive contact 52 through the insulating body 1.

[0041] Further, preferably, Figures 1 to 4 As shown, in an embodiment, the first conductive contact 51 and the second conductive contact 52 can be vertically disposed through the top plate 10. Specifically, the first conductive contact 51 and the second conductive contact 52 can include a ceramic outer ring and a metal portion secured within the ceramic outer ring. The top plate 10 can have two mounting holes spaced apart, and the ceramic outer ring can be interference-fitted with the mounting holes, thereby securing the first conductive contact 51 and the second conductive contact 52 to the top plate 10.

[0042] Preferably, Figures 1 to 4 As shown, in an embodiment, the external terminal 4 can be provided in the housing 61, and the external terminal 4 can be welded to the housing 61. The external terminal 4 is provided through the housing 61, so that a portion of the external terminal 4 is located inside the housing 61 and another portion is located outside the housing 61. The portion of the external terminal 4 located inside the housing 61 can be provided with two wiring contacts 40 for connecting to the first conductive contact 51 and the second conductive contact 52 via a wire 50, respectively, to form a complete circuit.

[0043] More preferably, Figures 1 to 4 As shown, in an embodiment, the top ends of the first conductive contact 51 and the second conductive contact 52 can be connected to the wire 50. Therefore, the first conductive contact 51 and the second conductive contact 52 can be connected to the wiring contact 40 of the external terminal 4 through the wire 50 respectively. When the conductive plate 2 is in a preset position, the top surface of the conductive plate 2 is in contact with the bottom ends of the first conductive contact 51 and the second conductive contact 52. Preferably, the bottom ends of the first conductive contact 51 and the second conductive contact 52 can be flush with each other. The top surface of the conductive plate 2 can be a horizontal surface. Such an arrangement enables the first conductive contact 51 and the second conductive contact 52 to be in contact with the top surface of the conductive plate 2 at the same time, so that a stable loop can be formed when the conductive plate 2 is in the preset position.

[0044] In addition, preferably, Figures 1 to 4As shown, in an embodiment, an annular ridge 101 may also be formed on the upper surface of the top plate portion 10. The oil drain pipe 65 may be a circular pipe, and the pipe mouth of the oil drain pipe 65 may be inserted into the annular ridge 101, so that the annular ridge 101 can be arranged around the outer periphery of the port of the oil drain pipe 65 to prevent oil from overflowing from the connection between the oil drain pipe 65 and the top plate portion 10. The oil passage 100 of the top plate portion 10 may be arranged directly below the port of the oil drain pipe 65. This arrangement can increase the speed at which oil passes through the top plate portion 10, so as to prevent excessive accumulation of oil at the connection between the top plate portion 10 and the oil drain pipe 65, resulting in oil overflowing from the connection between the oil drain pipe 65 and the top plate portion 10.

[0045] Preferably, Figures 1 to 4 As shown, in this embodiment, the reset portion 3 is mounted on the insulating body 1 and may include an insulating rail 31, a limiting base plate 32, and a reset spring 33. The insulating rail 31 may be a cylindrical rod. The insulating rail 31 may be inserted through the conductive plate 2, allowing the conductive plate 2 to slide along the length of the insulating rail 31 to provide a guide. The top end of the insulating rail 31 may be connected to the center of the top plate 10 (the multiple oil ports 100 may be arranged away from the center of the top plate 10). Preferably, the insulating rail 31 may be made of the same material as the insulating body 1 and may be integrally formed with the top plate 10. The limiting base plate 32 may be formed at the bottom end of the insulating rail 31. The limiting base plate 32 may be a circular plate, with its surface perpendicular to the axial direction of the insulating rail 31. The reset spring 33 may be sleeved onto the insulating rail 31. The top end of the return spring 33 can abut against the bottom surface of the conductive plate 2, and the bottom end of the return spring 33 can abut against the top surface of the limiting bottom plate 32. This allows the return spring 33 to continuously provide an upward force to the conductive plate 2, thereby causing the conductive plate 2 to tend to move toward the preset position. When the oil in the upper oil reservoir 63 is insufficient, the oil drain pipe 65 cannot drain sufficient oil. At this time, the conductive plate 2 will move to the preset position under the elastic force of the return spring 33.

[0046] Further, preferably, Figures 1 to 4As shown, in an embodiment, the insulating body 1 may further include a side plate portion 11. The side plate portion 11 may be formed in a ring shape, and the top end of the side plate portion 11 may be connected to the outer periphery of the top plate portion 10. Correspondingly, the conductive plate 2 may be formed as a circular plate. The side plate portion 11 may extend in a vertical direction so that the side plate portion 11 is arranged around the outer periphery of the insulating slide rail 31. In this case, the conductive plate 2 is located inside the side plate portion 11. The side plate portion 11 can protect the oil and structural parts inside it from the influence of airflow. In addition, a circulation gap 20 for oil circulation is also provided between the conductive plate 2 and the inner wall of the side plate portion 11, so that the oil discharged from the oil drain pipe 65 can flow to the lower oil pool 62 through the circulation gap 20.

[0047] More preferably, Figures 1 to 4 As shown, in an embodiment, the cross-sectional area of the conductive plate 2 can be 1.5 to 2 times the flow area of the oil drain pipe 65, thereby allowing the conductive plate 2 to receive sufficient oil to prevent the oil discharged from the oil drain pipe 65 from causing the conductive plate 2 to move away from the preset position. The cross-sectional area of the flow gap 20 can be 1 / 2 to 3 / 4 times the flow area of the oil drain pipe 65. This arrangement allows a sufficient amount of oil to remain between the top plate 10 and the conductive plate 2, further ensuring that the oil can cause the conductive plate 2 to move away from the preset position.

[0048] Preferably, in an embodiment, the compressor oil level sensor may further include a current detection unit 7. The current detection unit 7 may be disposed outside the housing 61 and may be electrically connected to the portion of the external terminal 4 outside the housing 61. When there is sufficient oil in the upper oil reservoir 63, the first conductive contact 51 and the second conductive contact 52 may be electrically connected to the conductive plate 2 via the oil, thereby making the oil part of the conductive circuit. At this time, the current at the external terminal 4 is related to the resistance of the oil. The current detection unit 7 can use the current at the external terminal 4 to determine whether the oil purity has reached an alarm threshold. Specifically, when the oil contains refrigerant or other impurities exceeding a preset value, the current detection unit 7 will detect that the current at the external terminal 4 has exceeded the alarm threshold, and the current detection unit 7 will issue an alarm (specifically, the alarm may be provided by a buzzer, an LED light, or the like).

[0049] Specifically, such as Figure 5As shown, in this embodiment, the current detection unit 7 may include a power supply 71, a current protection component 72, and a current detection component 73. The power supply 71 may be a low-power, high-voltage power supply (e.g., 1500V, less than 300W). The power supply 71 is connected to the current protection component 72 and the current detection component 73 via wires. The current detection component 73 may be a milliampere sensor, and the current protection component 72 may be a relay. The current protection component 72 and the current detection component 73 are each connected to the external terminal 4 via wires. In addition, the current detection component 73 and the current protection component 72 may be electrically connected to a central controller for signal transmission, and the central controller may issue an alarm upon receiving the signal.

[0050] In this embodiment, when the compressor is short of oil, the current is high (e.g., current > 0.2A) due to direct contact between the conductive plate 2 and the first and second conductive contacts 51, 52. The current protection component 72 disconnects the compressor circuit, shutting it down and feeding back a switch signal to the central controller. Upon receiving this switch signal, the central controller issues an alarm. However, when the compressor is not short of oil, but refrigerant or other impurities exceeding a preset value are mixed into the oil, the conductive plate 2 is not in direct contact with the first and second conductive contacts 51, 52. The current is low, and the preset value of the current protection component 72 > the current value > the preset value of the current detection component 73 (e.g., 0.2A > current > 5mA). The current detection component 73 feeds back a signal to the central controller, which issues an alarm upon receiving the signal from the current detection component 73. In this case, an operator is required to shut down the compressor for inspection.

[0051] In addition, if Figure 1 and Figure 2 As shown, according to a second aspect of the present invention, a compressor is provided, comprising the oil level sensor for the compressor as described above.

[0052] Preferably, Figure 1 and Figure 2As shown, in an embodiment, the compressor may further include a housing 61, a lower oil pool 62, an upper oil pool 63, an oil pump 66, an oil suction pipe 64, and an oil discharge pipe 65. The external terminal 4 may be welded to the housing 61. The wiring contact 40 of the external terminal 4 is disposed inside the housing 61 to facilitate conductive connection with the first conductive contact 51 and the second conductive contact 52. Part of the external terminal 4 is exposed outside the housing 61 to facilitate conductive connection with the current detection unit 7. The lower oil pool 62 may be disposed at the lower portion of the housing 61, and the upper oil pool 63 may be disposed at the upper portion of the housing 61. An oil pump 66 is disposed in the lower oil pool 62 for oil suction. The bottom end of the oil suction pipe 64 is connected to the oil pump 66, and the top end of the oil suction pipe 64 is connected to the upper oil pool 63, so that the oil in the lower oil pool 62 can flow to the upper oil pool 63 through the oil suction pipe 64. That is, when the oil in the lower oil sump 62 is low, the oil in the upper oil sump 63 will also be low, allowing the oil levels in both the upper and lower oil sumps 63 and 62 to be monitored simultaneously. The top end of the oil drain pipe 65 can be connected to the upper oil sump 63, and the bottom end of the oil drain pipe 65 can be connected to the compressor's oil level sensor. The oil in the upper oil sump 63 can flow through the oil drain pipe 65 to the compressor's oil level sensor, and then flow through the compressor's oil level sensor to the lower oil sump 62.

[0053] During use, when the upper oil reservoir 63 is sufficient, the oil drain pipe 65 drains sufficient oil, and the conductive plate 2 moves away from the preset position. At this point, the first and second conductive contacts 51, 52 are electrically connected to the conductive plate 2 via the oil. The resistance between the first and second conductive contacts 51, 52 is relatively high, and the current at the external terminal 4 is relatively low. In this case, if refrigerant or other impurities are present in the oil, the oil resistance will decrease. When the current detection unit 7 detects that the current at the external terminal 4 exceeds the alarm threshold, the current detection unit 7 will issue an alarm. When the upper oil reservoir 63 is insufficient, the oil drain pipe 65 drains insufficient oil, and the reset unit 3 can drive the conductive plate 2 toward the preset position until the conductive plate 2 comes into direct contact with the first and second conductive contacts 51, 52. At this point, the resistance between the first and second conductive contacts 51, 52 is relatively low, and the current at the external terminal 4 is relatively high. Therefore, it is possible to determine whether the oil in the upper oil pool 63 of the compressor is sufficient and whether there are excessive impurities in the oil based on the current at the external terminal 4, so as to avoid damage to the compressor.

[0054] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The scope of protection of the present application is not limited thereto. Although the present application has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-described embodiments within the technical scope disclosed in the present application, or perform equivalent replacements for some of the technical features thereof. These modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the scope of protection of the claims.

Claims

1. An oil level sensor for a compressor, provided on the compressor, characterized in that: The oil level sensor for the compressor comprises: an insulating body connected to the oil drain pipe of the compressor, and the insulating body is located above the lower oil pool of the compressor; an external terminal mounted on the compressor housing, the insulating body being provided with a first conductive contact and a second conductive contact, the external terminal being connected to the first conductive contact and the second conductive contact respectively via wires; a conductive plate movably mounted on the insulating body, wherein when the conductive plate moves to a preset position, the conductive plate contacts the first conductive contact and the second conductive contact; and The reset part is installed on the insulating body, and the oil discharged from the oil drain pipe can drive the conductive plate to move in a direction away from the preset position. When the oil discharged from the oil drain pipe is insufficient, the reset part can drive the conductive plate to move in a direction close to the preset position.

2. The oil level sensor for a compressor according to claim 1, characterized in that: The insulating body includes a top plate portion, which is installed on the port of the oil drain pipe. The top plate portion is provided with a plurality of oil passage ports, through which the oil discharged from the oil drain pipe flows. The first conductive contact and the second conductive contact are installed on the top plate portion.

3. The oil level sensor for a compressor according to claim 2, characterized in that: The reset unit includes: an insulating slide rail, passing through the conductive plate, wherein the top end of the insulating slide rail is connected to the middle portion of the top plate, and the conductive plate moves along the insulating slide rail; a limiting bottom plate, arranged at the bottom end of the insulating slide rail; and A return spring is sleeved on the insulating slide rail, the top end of the return spring abuts against the bottom surface of the conductive plate, and the bottom end of the return spring abuts against the top surface of the limiting bottom plate.

4. The oil level sensor for a compressor according to claim 3, characterized in that: The insulating body further includes a side plate portion, which is connected to the outer periphery of the top plate portion and is arranged around the outer periphery of the insulating slide rail. A flow gap for oil flow is provided between the conductive plate and the side plate portion.

5. The oil level sensor for a compressor according to claim 2, characterized in that: An annular convex edge is formed on the upper surface of the top plate portion. The annular convex edge is arranged around the outer periphery of the port of the oil drain pipe. The oil passage port is arranged directly below the port of the oil drain pipe.

6. The oil level sensor for a compressor according to claim 2, characterized in that: The first conductive contact and the second conductive contact are vertically arranged in the top plate portion, the top ends of the first conductive contact and the second conductive contact are respectively connected to the external terminals through wires, and the bottom ends of the first conductive contact and the second conductive contact can simultaneously contact the top surface of the conductive plate.

7. The oil level sensor for a compressor according to claim 4, characterized in that: The cross-sectional area of the conductive plate is 1.5 to 2 times the flow area of the oil drain pipe, and the cross-sectional area of the flow gap is 1 / 2 to 3 / 4 times the flow area of the oil drain pipe.

8. The oil level sensor for a compressor according to any one of claims 1 to 7, characterized in that: The oil level sensor for the compressor also includes a current detection part, which is arranged outside the shell, and the external terminal is passed through the shell. The current detection part is conductively connected to the external terminal, and the first conductive contact and the second conductive contact can be conductively connected to the conductive plate through oil.

9. A compressor, characterized in that: The compressor includes the oil level sensor for a compressor according to any one of claims 1 to 8.

10. The compressor according to claim 9, characterized in that The compressor further comprises: a housing, wherein the connection contacts of the external terminals are arranged inside the housing, and the external terminals are partially exposed outside the housing; a lower oil pool, arranged at the lower portion of the housing; An upper oil tank is arranged on the upper part of the shell; an oil pump, disposed in the lower oil pool; an oil suction pipe, wherein the bottom end of the oil suction pipe is connected to the oil pump, and the top end of the oil suction pipe is connected to the upper oil tank, so that the oil in the lower oil tank can flow to the upper oil tank through the oil suction pipe; and An oil drain pipe, the top end of which is connected to the upper oil tank, and the bottom end of which is connected to the oil level sensor for the compressor. The oil in the upper oil tank can flow to the lower oil tank through the oil drain pipe and the oil level sensor for the compressor.

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