Compressor oil level detection and protection device and refrigeration equipment

Abstract

The utility model discloses an oil level detection and protection device for a compressor and refrigeration equipment, the oil level detection and protection device for the compressor comprises a main control chip and at least one oil level detection contact arranged at an oil storage part of the compressor, and each oil level detection contact is connected to the main control chip through an oil level detection circuit; the main control chip is further connected with at least one adjusting module used for adjusting the oil return state of the compressor, and the trigger state of the adjusting module is set according to the trigger state of the oil level detection circuit. Compared with the prior art, oil level detection is achieved in a hardware circuit mode, meanwhile, oil return control is added, and the system energy efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of refrigeration, especially a compressor oil level detection and protection device and refrigeration equipment. BACKGROUND

[0002] In the compressor operation process, lubricating oil plays a vital role, due to the operation characteristic of air conditioning unit, part of lubricating oil will be discharged from the compressor with refrigerant, through the condenser and evaporator to return to the compressor, in the air conditioning system, the evaporator pressure is low, temperature is low, leading to lubricating oil viscosity, oil return difficulty, easily leading to compressor oil shortage, once oil shortage, it will affect the compressor motor lubrication, leading to wear, burning the compressor.

[0003] The traditional compressor oil level control mostly adopts the test mode, realizes the determination periodic oil return, in the patent CN105180533A, only how to utilize the detection device to know the oil level is explained, how to realize is not explicitly shown, and needs to control the evaporation temperature, and the control logic is complex, not easy to realize. If too much lubricating oil is retained in the evaporator, the evaporator heat exchange efficiency will be reduced, the system energy efficiency will be reduced, and the unit power consumption will be increased.

[0004] Therefore, how to design a compressor oil level detection and protection device and refrigeration equipment can realize the oil level detection of the compressor, and combine the peripheral circuit to protect the compressor from wear caused by oil shortage, which is a technical problem to be solved in the industry. INVENTION CONTENTS

[0005] In view of the problem that the compressor has oil shortage in the prior art, which affects the compressor motor lubrication, leading to wear and burning the compressor, the utility model provides a compressor oil level detection and protection device and refrigeration equipment.

[0006] The technical scheme of the utility model provides a compressor oil level detection and protection device, which comprises a main control chip and at least one oil level detection contact point arranged in the oil storage part of the compressor, and each oil level detection contact point is connected to the main control chip through an oil level detection circuit.

[0007] The main control chip is also connected with at least one adjusting module for adjusting the oil return state of the compressor, and the trigger state of the adjusting module is set according to the trigger state of the oil level detection circuit.

[0008] Further, the adjusting module is provided with three, which are a first adjusting module for adjusting the opening degree of the electronic expansion valve, a second adjusting module for controlling the suction superheat degree, and a third adjusting module for controlling the discharge superheat degree.

[0009] Further, the oil level detection contact is provided with three, and includes a first oil level detection contact corresponding to the highest oil level, a second oil level detection contact corresponding to the intermediate oil level, and a third oil level detection contact corresponding to the lowest oil level;

[0010] And when the oil level detection circuits corresponding to the three oil level detection contacts are all triggered, the first adjusting module, the second adjusting module, and the third adjusting module are not triggered;

[0011] When the oil level detection circuit corresponding to the second oil level detection contact and the oil level detection circuit corresponding to the third oil level detection contact are triggered, the first adjusting module and the second adjusting module are triggered;

[0012] When the oil level detection circuit corresponding to the third oil level detection contact is triggered, the first adjusting module and the third adjusting module are triggered;

[0013] When the oil level detection circuits corresponding to the three oil level detection contacts are all not triggered, the main control chip reports a compressor fault, and the first adjusting module, the second adjusting module, and the third adjusting module are not triggered.

[0014] Further, the oil level detection circuit includes a comparison circuit and a trigger circuit;

[0015] The input end of the comparison circuit is connected to the oil level detection contact, the output end of the comparison circuit is connected to the input end of the trigger circuit, and when the oil level in the oil storage part of the compressor reaches the oil level detection contact, the comparison circuit outputs a low-level signal;

[0016] The input end of the trigger circuit is connected to the output end of the comparison circuit, and the output end of the trigger circuit is connected to the main control chip, and when the input end of the trigger circuit receives a low-level signal, the output end of the trigger circuit outputs a low-level signal.

[0017] Further, the comparison circuit includes a comparator U1A, a resistor R1, a resistor R2, a resistor R3, and a capacitor C1;

[0018] Wherein, one end of the resistor R1 is grounded, the other end of the resistor R1 is connected to one end of the resistor R2, and the other end of the resistor R2 is connected to a power supply;

[0019] The non-inverting input end of the comparator U1A is connected between the resistor R1 and the resistor R2, the inverting input end of the comparator U1A is connected to one end of the resistor R3, the output end of the comparator U1A is connected to the input end of the trigger circuit as the output end of the comparison circuit, and the other end of the resistor R3 is connected to the oil level detection contact as the input end of the comparison circuit.

[0020] One end of the capacitor C1 is connected between the resistor R3 and the inverting input terminal of the comparator U1A, and the other end of the capacitor C1 is grounded.

[0021] Further, the trigger circuit comprises a resistor R4, a resistor R5, a resistor R6, a capacitor C2, a capacitor C3, a capacitor C4, a PNP type transistor Q1 and a 555 timer.

[0022] The emitter of the PNP type transistor Q1 is connected to a power supply, the collector of the PNP type transistor Q1 is connected to one end of the resistor R5, the base of the PNP type transistor Q1 is connected to the output terminal of the comparison circuit as an input terminal of the trigger circuit, and the other end of the resistor R5 is grounded.

[0023] One end of the resistor R6 is connected to a power supply, the other end of the resistor R6 is connected to one end of the capacitor C4, and the other end of the capacitor C4 is grounded.

[0024] The RESET pin of the 555 timer is connected to a power supply, the DISCH pin and the THRES pin of the 555 timer are connected between the resistor R6 and the capacitor C4, the TRIG pin of the 555 timer is connected to one end of the resistor R4, the other end of the resistor R4 is connected between the collector of the PNP type transistor Q1 and the resistor R5, the CONT pin of the 555 timer is connected to one end of the capacitor C3, the other end of the capacitor C3 is grounded, and the OUT pin of the 555 timer is connected to the master control chip as an output terminal of the trigger circuit.

[0025] Further, an inverting circuit is further connected between the trigger circuit and the master control chip, the input terminal of the inverting circuit is connected to the output terminal of the trigger circuit, the output terminal of the inverting circuit is connected to the master control chip, and when the input terminal of the inverting circuit receives a low level signal, the output terminal of the inverting circuit outputs a high level signal.

[0026] Further, the inverting circuit comprises a resistor R7, a resistor R8, a resistor R9, a resistor R10, a capacitor C5 and an NPN type transistor Q2.

[0027] Among them, one end of the resistor R8 is connected to a power supply, the other end of the resistor R8 is connected to one end of the resistor R10, the other end of the resistor R10 is connected to the master control chip as an output terminal of the inverting circuit, one end of the capacitor C5 is connected to the other end of the resistor R10, and the other end of the capacitor C5 is grounded.

[0028] The emitter of the NPN triode Q2 is grounded, the collector of the NPN triode Q2 is connected between the resistor R8 and the resistor R10, and the base of the NPN triode Q2 is connected to one end of the resistor R7, and the other end of the resistor R7 is connected to the output terminal of the trigger circuit as an input terminal of the inverting circuit.

[0029] One end of the resistor R9 is connected between the resistor R7 and the base of the NPN triode Q2, and the other end of the resistor R9 is grounded.

[0030] The utility model discloses a kind of refrigeration equipment, and the refrigeration equipment has above-mentioned compressor oil level detection and protection device.

[0031] Further, the refrigeration equipment is air conditioner.

[0032] Compared with prior art, the utility model at least has following beneficial effects:

[0033] The utility model is provided with oil level detection circuit and at least one adjusting module, can realize compressor internal oil level detection by oil level detection circuit, change the oil return state of compressor by combining the work of adjusting module, can protect compressor to avoid wear caused by oil shortage. Meanwhile, the trigger state of adjusting module is set according to the trigger state of oil level detection circuit, and the oil level detection circuit is corresponding to oil level detection contact, so that the adjustment of adjusting module to the oil return state of compressor in the utility model is actually adjusted according to current oil level, so that more reasonable control can be achieved, to ensure that oil level is in reasonable range under full working condition, and improve system energy efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can obtain other drawings according to these drawings without creating labor intensity.

[0035] Figure 1 It is the overall principle diagram of compressor operation in the utility model;

[0036] Figure 2 It is the overall principle diagram of compressor oil level detection and protection device in the utility model;

[0037] Figure 3 It is the circuit topology diagram of oil level detection circuit in the utility model;

[0038] Figure 4 It is the flow chart of adjusting the oil return state of compressor in the utility model. DETAILED DESCRIPTION

[0039] In order to make the technical problems, technical solutions and beneficial effects of the utility model clearer, the utility model will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model and are not used to limit the utility model.

[0040] Therefore, one feature described in the specification will be used to explain one feature of one embodiment of the utility model, and it is not implied that each embodiment of the utility model must have the explained feature. In addition, it should be noted that the specification describes many features. Although certain features can be combined together to show possible system designs, these features can also be used in other combinations that are not explicitly described. Therefore, unless otherwise stated, the described combination is not intended to be limiting.

[0041] The principles and structures of the utility model will be described in detail below in combination with the drawings and examples.

[0042] During the operation of the compressor, the lubricating oil plays a crucial role. Due to the operating characteristics of the air conditioning unit, part of the lubricating oil will be discharged from the compressor along with the refrigerant, pass through the condenser and evaporator, and then return to the compressor. In the air conditioning system, the evaporator pressure is low, and the temperature is low, which results in large lubricating oil viscosity and difficulty in returning oil, which easily leads to compressor oil shortage. Once the oil is short, it will affect the lubrication of the compressor motor, causing wear and tear and burning the compressor.

[0043] Therefore, it is urgent to design a compressor oil level detection and protection device that can detect the oil level of the compressor and perform corresponding control when the compressor is short of oil to adjust the oil return state of the compressor and avoid wear and tear of the compressor due to oil shortage.

[0044] Based on the above problems, the design idea of the utility model is to provide a compressor oil level detection and protection device, which comprises a main control chip and at least one oil level detection contact arranged in the oil storage part of the compressor, and each oil level detection contact is connected to the main control chip through an oil level detection circuit.

[0045] The main control chip is also connected to at least one adjusting module for adjusting the oil return state of the compressor, and the trigger state of the adjusting module is set according to the trigger state of the oil level detection circuit.

[0046] From the above setting can be seen, the utility model has multiple oil level detection contacts, which are respectively arranged at different positions of the oil storage part of the compressor, when the oil level in the oil storage part of the compressor reaches the corresponding oil level detection contact, the oil level detection contact can detect the current oil level and provide corresponding signals for the subsequent oil level detection circuit.

[0047] Meanwhile, from the above setting can be seen, the utility model is provided with at least one adjusting module, which is used for adjusting the oil return state of the compressor, and the triggering state thereof corresponds to the triggering state of the oil level detection circuit, that is, the utility model links the oil level of the compressor with the corresponding adjusting module, which can be adjusted according to the current oil level to achieve more reasonable control.

[0048] Specifically, the adjusting module in the utility model is provided with three, which are a first adjusting module for adjusting the opening degree of the electronic expansion valve, a second adjusting module for controlling the suction superheat degree, and a third adjusting module for controlling the exhaust superheat degree.

[0049] The oil return state of the compressor is mainly determined by the above-mentioned opening degree of the electronic expansion valve, the suction superheat degree and the exhaust superheat degree, therefore, after the above-mentioned first adjusting module, second adjusting module and third adjusting module are provided in the utility model, they can be used for adjusting the oil return state of the compressor to solve the problem of oil shortage of the compressor.

[0050] Furthermore, the oil level detection contacts in the utility model are also provided with three, which include a first oil level detection contact corresponding to the highest oil level, a second oil level detection contact corresponding to the intermediate oil level and a third oil level detection contact corresponding to the lowest oil level.

[0051] And when the oil level detection circuits corresponding to the three oil level detection contacts are all triggered, the first adjusting module, the second adjusting module and the third adjusting module are not triggered.

[0052] When the oil level detection circuits corresponding to the second oil level detection contact and the third oil level detection contact are triggered, the first adjusting module and the second adjusting module are triggered.

[0053] When the oil level detection circuit corresponding to the third oil level detection contact is triggered, the first adjusting module and the third adjusting module are triggered.

[0054] When the oil level detection circuits corresponding to the three oil level detection contacts are not triggered, the main control chip reports the compressor fault, and the first adjusting module, the second adjusting module and the third adjusting module are not triggered.

[0055] From the above setting can be seen, the utility model discloses three oil level detection contacts are provided, and the trigger state of the oil level detection circuit corresponding to the three oil level detection contacts is corresponding with the trigger state of the adjusting module, that is, the oil level of the compressor is connected with the corresponding adjusting module in the utility model, can be adjusted according to the current oil level, so that more reasonable control is reached.

[0056] Please see Figure 2 , it is the overall principle diagram of the compressor oil level detection and protection device in the utility model, the attached Figure 2 U1, U2, U3 are first oil level detection contact, second oil level detection contact and third oil level detection contact respectively, and the left side of the three oil level detection contacts is connected with the oil level detection circuit (the oil level detection contact and the oil level detection circuit are one-to-one corresponding in the utility model, here, for the convenience of representation, only one oil level detection circuit is indicated).

[0057] From the attached Figure 2 , it can be seen that the position of the first oil level detection contact is the highest, when the oil level in the compressor is higher than the first oil level detection contact, then the oil level detection circuit corresponding to the three oil level detection contacts will be triggered simultaneously.

[0058] Similarly, when the oil level in the compressor is between the first oil level detection contact and the second oil level detection contact, then the second oil level detection circuit and the third oil level detection circuit will be triggered simultaneously.

[0059] When the oil level in the compressor is between the second detection contact and the third oil level detection contact, then only the third oil level detection circuit will be triggered.

[0060] When the oil level in the compressor is lower than the third oil level detection contact, then no oil level detection circuit will be triggered.

[0061] From the above working principle, it can be seen that the utility model can accurately obtain the current oil level information in the compressor according to the oil level detection circuit, and the oil level detection circuit is also connected to the main control chip, that is, the MCU in the attached Figure 2 , the left side of the main control chip is connected with the first adjusting module, the second adjusting module and the third adjusting module respectively.

[0062] Here, the first adjusting module corresponds to the electronic expansion valve control in the attached Figure 2 , the second adjusting module corresponds to the suction superheat control in the attached Figure 2 , and the third adjusting module corresponds to the exhaust superheat control in the attached Figure 3 , after receiving the trigger information of the oil level detection circuit, the main control chip can correspondingly adjust the working state of the three adjusting modules, and then adjust the oil return state of the compressor.

[0063] Through the above solution, the utility model can link the oil level of the compressor with the corresponding adjustment module, and can adjust according to the current oil level, thereby achieving more reasonable control.

[0064] Furthermore, the oil level detection circuit in the present invention is mainly divided into two parts, namely a comparison circuit and a trigger circuit;

[0065] The input end of the comparison circuit is connected to the oil level detection contact, the output end of the comparison circuit is connected to the input end of the trigger circuit, and when the oil level in the oil storage part of the compressor reaches the oil level detection contact, the comparison circuit outputs a low level signal;

[0066] The input end of the trigger circuit is connected to the output end of the comparison circuit, the output end of the trigger circuit is connected to the main control chip, and when the input end of the trigger circuit receives a low level signal, the output end of the trigger circuit outputs a low level signal.

[0067] For details, see Figure 3 , the comparison circuit in the utility model includes: a comparator U1A, a resistor R1, a resistor R2, a resistor R3, and a capacitor C1;

[0068] One end of the resistor R1 is grounded, the other end of the resistor R1 is connected to one end of the resistor R2, and the other end of the resistor R2 is connected to a power supply;

[0069] The non-inverting input terminal of the comparator U1A is connected between the resistor R1 and the resistor R2, the inverting input terminal of the comparator U1A is connected to one end of the resistor R3, the output terminal of the comparator U1A is connected to the input terminal of the trigger circuit as the output terminal of the comparison circuit, and the other end of the resistor R3 is connected to the oil level detection contact as the input terminal of the comparison circuit;

[0070] One end of the capacitor C1 is connected between the resistor R3 and the inverting input terminal of the comparator U1A, and the other end of the capacitor C1 is grounded.

[0071] The working principle of the oil level detection contact is that when the oil level in the compressor reaches the oil level contact, a high level signal will be provided to the oil level detection circuit, otherwise a low level signal will be provided;

[0072] like Figure 3 As shown, the oil level detection contact of U1 corresponds to the signal provided by the oil level detection circuit, which is input to the inverting input terminal of the comparator U1A through the resistor R4;

[0073] According to the working principle of the comparator U1A, when the level of the non-inverting input terminal of the comparator U1A is higher than the level of the inverting input terminal, the comparator U1A outputs a high-level signal. Conversely, when the level of the non-inverting input terminal of the comparator U1A is lower than the level of the inverting input terminal, the comparator U1A outputs a low-level signal.

[0074] Since the non-inverting input of the comparator U1A is connected between the resistor R2 and the resistor R3, the high level signal can be obtained from the power supply VDD, thus when the inverting input of the comparator U1A is high level, the comparator U1A outputs low level signal, that is, when the oil level in the compressor reaches the corresponding oil level detection contact, the comparator U1A outputs low level signal, otherwise, high level signal is outputted.

[0075] The above-mentioned comparison circuit needs to work with the trigger circuit to provide corresponding signals for the main control chip to trigger the corresponding adjustment module, please refer to Figure 3 The trigger circuit in the utility model comprises:

[0076] The resistor R4, the resistor R5, the resistor R6, the capacitor C2, the capacitor C3, the capacitor C4, the PNP type triode Q1 and the 555 timer.

[0077] The emitter of the PNP type triode Q1 is connected to the power supply, the collector of the PNP type triode Q1 is connected to one end of the resistor R5, the base of the PNP type triode Q1 is connected to the output end of the comparison circuit as the input end of the trigger circuit, and the other end of the resistor R5 is grounded.

[0078] One end of the resistor R6 is connected to the power supply, the other end of the resistor R6 is connected to one end of the capacitor C4, and the other end of the capacitor C4 is grounded.

[0079] The RESET pin of the 555 timer is connected to the power supply, the DISCH pin and the THRES pin of the 555 timer are connected between the resistor R6 and the capacitor C4, the TRIG pin of the 555 timer is connected to one end of the resistor R4, the other end of the resistor R4 is connected between the collector of the PNP type triode Q1 and the resistor R5, the CONT pin of the 555 timer is connected to one end of the capacitor C3, the other end of the capacitor C3 is grounded, and the OUT pin of the 555 timer is connected to the main control chip as the output end of the trigger circuit.

[0080] The working principle of the 555 timer is that when the TRIG pin (corresponding to the input end of the trigger circuit in the foregoing text) connected to it receives a low level signal, the corresponding OUT pin (corresponding to the output end of the trigger circuit in the foregoing text) will output a high level signal, and vice versa.

[0081] For the PNP type transistor Q1, when the level of the emitter is higher than the level of the base, the PNP type transistor Q1 is turned on. Here, the emitter of the PNP type transistor Q1 is connected to the power supply VDD as a high level, so when the base of the PNP type transistor Q1 is low, the PNP type transistor Q1 can be turned on. Since the base of the PNP type transistor Q1 is connected to the output end of the comparator U1A, according to the working principle of the comparator circuit, the comparator U1A will only output a low level signal when the oil level of the compressor reaches the corresponding oil level detection contact, that is, when the oil level of the compressor reaches the corresponding oil level detection contact, the PNP type transistor Q1 is turned on, and at this time the TRIG pin of the 555 timer is connected to the power supply VDD through the PNP type transistor Q1 as a high level, and the OUT pin of the 555 timer outputs a low level signal.

[0082] Conversely, when the oil level of the compressor does not reach the corresponding oil level detection contact, the PNP type transistor Q1 is cut off, and at this time the TRIG pin of the 555 timer is grounded through the resistor R5 and the resistor R6 as a low level, and the OUT pin of the 555 timer outputs a high level signal.

[0083] The above-mentioned comparison circuit and trigger circuit can realize the functions of the oil level detection circuit, and when the oil level of the compressor reaches the corresponding oil level detection contact, the oil level detection circuit outputs a low level signal, and the main control chip can determine the position of the oil level in the compressor according to the received signal.

[0084] When the first oil level detection circuit outputs a high level signal and the other two oil level detection circuits output low level signals, it indicates that the oil level in the compressor is lower than the position of the first oil level detection contact and higher than the position of the second oil level detection contact, and the oil level in the compressor can be accurately determined.

[0085] However, in actual application, it is difficult to determine the low level signal, and it may also be caused by circuit damage and failure to receive a high level signal, in order to avoid this situation, the utility model also sets a inverter circuit for inverting the low level signal to a high level signal, so that when the oil level of the compressor reaches the corresponding oil level detection contact, the oil level detection circuit outputs a high level signal.

[0086] Specifically, the oil level detection circuit in the utility model further comprises an inverter circuit connected between the trigger circuit and the main control chip, the input end of the inverter circuit is connected to the output end of the trigger circuit, the output end of the inverter circuit is connected to the main control chip, and when the input end of the inverter circuit receives a low level signal, the output end of the inverter circuit outputs a high level signal.

[0087] Specifically, please refer to Figure 3The inverting circuit comprises a resistor R7, a resistor R8, a resistor R9, a resistor R10, a capacitor C5, and an NPN triode Q2.

[0088] One end of the resistor R8 is connected to a power supply, the other end of the resistor R8 is connected to one end of the resistor R10, the other end of the resistor R10 is connected to a main control chip as an output end of the inverting circuit, one end of the capacitor C5 is connected to the other end of the resistor R10, and the other end of the capacitor C5 is grounded.

[0089] The emitter of the NPN triode Q2 is grounded, the collector of the NPN triode Q2 is connected between the resistor R8 and the resistor R10, and the base of the NPN triode Q2 is connected to one end of the resistor R7, and the other end of the resistor R7 is connected to an output end of a trigger circuit as an input end of the inverting circuit.

[0090] One end of the resistor R9 is connected between the resistor R7 and the base of the NPN triode Q2, and the other end of the resistor R9 is grounded.

[0091] The working principle of the NPN triode Q2 is that when the base voltage is higher than the emitter voltage, the NPN triode Q2 is turned on, and vice versa. Since the emitter of the NPN triode Q2 is grounded as a low level, the NPN triode Q2 can be turned on only when the base of the NPN triode Q2 (i.e. the input end of the inverting circuit) is high.

[0092] According to the working principle of the trigger circuit, when the oil level of the compressor reaches the corresponding oil level detection contact, the trigger circuit outputs a low level signal, at this time, the base and the emitter of the NPN triode Q2 are low, and the NPN triode Q2 is cut off, at this time, the output pin MCU-pin1 is connected to the power supply VDD through the resistor R8 and the resistor R10 as a high level.

[0093] Conversely, when the oil level of the compressor does not reach the corresponding oil level detection contact, the trigger circuit outputs a high level signal, at this time, the NPN triode Q2 is turned on, at this time, the current passing through the resistor R8 is directly guided to the ground through the NPN triode Q2 (because the NPN triode Q2 is turned on as a conductor), at this time, no current passes through the resistor R10, and the output pin MCU-pin1 is low.

[0094] Based on the above inverting circuit, the working logic of the oil level detection circuit in the utility model becomes that when the oil level of the compressor reaches the oil level of the corresponding oil level detection contact, the oil level detection circuit outputs a high level signal, and vice versa.

[0095] The main control chip can determine the oil level in the compressor according to the received high level signal.

[0096] Based on the above settings, the principle of oil return state adjustment in the utility model is:

[0097] When the oil level detection circuits corresponding to the three oil level detection contacts are all triggered, the first adjustment module, the second adjustment module, and the third adjustment module are not triggered;

[0098] When the oil level detection circuits corresponding to the second oil level detection contact and the third oil level detection contact are triggered, the first adjustment module and the second adjustment module are triggered;

[0099] When the oil level detection circuit corresponding to the third oil level detection contact is triggered, the first adjustment module and the third adjustment module are triggered;

[0100] When the oil level detection circuits corresponding to the three oil level detection contacts are not triggered, the main control chip reports a compressor fault, and the first adjustment module, the second adjustment module, and the third adjustment module are not triggered.

[0101] Here, the triggering of the oil level detection circuit indicates outputting a high level, and the non-triggering indicates outputting a low level, the first adjustment module corresponds to Figure 2 the control of the electronic expansion valve, and the triggering of the first adjustment module means adjusting the opening degree of the electronic expansion valve;

[0102] The second adjustment module corresponds to Figure 2 the control of the suction superheat degree, and the triggering of the second adjustment module means adjusting the suction superheat degree;

[0103] The third adjustment module corresponds to Figure 2 the control of the discharge superheat degree, and the triggering of the third adjustment module means adjusting the discharge superheat degree.

[0104] Please refer to Figure 4 , the specific process of oil return state adjustment in the utility model is:

[0105] First, the oil level is detected, which is realized through the oil level detection circuit, and then it is judged whether the oil level in the compressor is less than H1, where the oil level H1 corresponds to the position of the first oil level detection contact, if it is higher than the oil level H1, it indicates that the compressor does not have an oil shortage problem, and then it returns to detection, if it is less than the oil level H1, the first adjustment module and the second adjustment module are controlled to be triggered, which is used to adjust the electronic expansion valve to be large, and at the same time, the suction superheat degree is increased, so as to speed up the oil return speed;

[0106] If it is less than the oil level H2, where the oil level H2 corresponds to the position of the second oil level detection contact, the first adjustment module and the third adjustment module are controlled to be triggered, which is used to adjust the electronic expansion valve to be small, and at the same time, the discharge temperature of the compressor is increased, the discharge superheat degree of the compressor is increased, so as to make the lubricating oil in the compressor quickly recover the superheat degree, reduce the dissolution rate of the lubricating oil in the refrigerant, and restore the oil level to normal;

[0107] If less than the oil level H3, here the oil level H3 corresponds to the position of the third oil level detection contact, the position is the lowest oil level in the compressor, below the oil level H3 indicates that the compressor has a lack of oil problem, the need for fault alarm.

[0108] Please see Figure 1 , which is the overall principle diagram of the compressor operation in the utility model, the U1, U2, U3 are corresponding different oil level detection contacts, the compressor passes through the indoor heat exchanger, outdoor heat exchanger, expansion valve constitutes a circuit.

[0109] Further, the utility model also proposes a kind of refrigeration equipment, and the refrigeration equipment has the above-mentioned compressor oil level detection and protection device.

[0110] Further, the above-mentioned refrigeration equipment is air conditioner.

[0111] Summarizing, the utility model compared with prior art has at least following beneficial effect:

[0112] The utility model is provided with oil level detection circuit and at least one adjusting module, can realize the oil level detection inside compressor by oil level detection circuit, change the oil return state of compressor in combination with the work of adjusting module, can protect compressor to avoid wear and tear due to lack of oil. Simultaneously, the trigger state of adjusting module is set according to the trigger state of oil level detection circuit, and the oil level detection circuit is corresponding to oil level detection contact, therefore, the adjustment of adjusting module to the oil return state of compressor in the utility model is actually adjusted according to current oil level, so that more reasonable control can be achieved, ensure that oil level is in reasonable range under full operating condition, improve system energy efficiency.

[0113] The above only describes preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A compressor oil level detection and protection device, characterized in that: The compressor comprises a main control chip and at least one oil level detection contact arranged in the oil storage part of the compressor, and each of the oil level detection contacts is connected to the main control chip through an oil level detection circuit; The main control chip is further connected to at least one regulating module for regulating the oil return state of the compressor, and the triggering state of the regulating module is set according to the triggering state of the oil level detection circuit; The oil level detection circuit includes a comparison circuit and a trigger circuit; The input end of the comparison circuit is connected to the oil level detection contact, the output end of the comparison circuit is connected to the input end of the trigger circuit, and when the oil level in the oil storage part of the compressor reaches the oil level detection contact, the comparison circuit outputs a low level signal; The input end of the trigger circuit is connected to the output end of the comparison circuit, the output end of the trigger circuit is connected to the main control chip, and when the input end of the trigger circuit receives a low level signal, the output end of the trigger circuit outputs a low level signal.

2. The compressor oil level detection and protection device according to claim 1, characterized in that: There are three regulating modules, namely a first regulating module for regulating the opening of the electronic expansion valve, a second regulating module for controlling the intake superheat, and a third regulating module for controlling the exhaust superheat.

3. The compressor oil level detection and protection device according to claim 2, characterized in that: There are three oil level detection contacts, including a first oil level detection contact corresponding to the highest oil level, a second oil level detection contact corresponding to the middle oil level, and a third oil level detection contact corresponding to the lowest oil level. When the oil level detection circuits corresponding to the three oil level detection contacts are all triggered, the first regulating module, the second regulating module, and the third regulating module are not triggered; When the oil level detection circuit corresponding to the second oil level detection contact and the oil level detection circuit corresponding to the third oil level detection contact are triggered, the first regulating module and the second regulating module are triggered; When the oil level detection circuit corresponding to the third oil level detection contact is triggered, the first regulating module and the third regulating module are triggered; When the oil level detection circuits corresponding to the three oil level detection contacts are not triggered, the main control chip reports a compressor failure, and the first regulating module, the second regulating module, and the third regulating module are not triggered.

4. The compressor oil level detection and protection device according to claim 1, characterized in that: The comparison circuit includes: a comparator U1A, a resistor R1, a resistor R2, a resistor R3, and a capacitor C1; One end of the resistor R1 is grounded, the other end of the resistor R1 is connected to one end of the resistor R2, and the other end of the resistor R2 is connected to a power supply; The non-inverting input terminal of the comparator U1A is connected between the resistor R1 and the resistor R2, the inverting input terminal of the comparator U1A is connected to one end of the resistor R3, the output terminal of the comparator U1A is connected to the input terminal of the trigger circuit as the output terminal of the comparison circuit, and the other end of the resistor R3 is connected to the oil level detection contact as the input terminal of the comparison circuit; One end of the capacitor C1 is connected between the resistor R3 and the inverting input terminal of the comparator U1A, and the other end of the capacitor C1 is grounded.

5. The compressor oil level detection and protection device according to claim 1, characterized in that: The trigger circuit includes: a resistor R4, a resistor R5, a resistor R6, a capacitor C2, a capacitor C3, a capacitor C4, a PNP transistor Q1, and a 555 timer; The emitter of the PNP transistor Q1 is connected to a power supply, the collector of the PNP transistor Q1 is connected to one end of the resistor R5, the base of the PNP transistor Q1 is connected to the output end of the comparison circuit as the input end of the trigger circuit, and the other end of the resistor R5 is grounded; One end of the resistor R6 is connected to a power supply, the other end of the resistor R6 is connected to one end of the capacitor C4, and the other end of the capacitor C4 is grounded; The RESET pin of the 555 timer is connected to the power supply, the DISCH pin and THRES pin of the 555 timer are connected between the resistor R6 and the capacitor C4, the TRIG pin of the 555 timer is connected to one end of the resistor R4, and the other end of the resistor R4 is connected between the collector of the PNP transistor Q1 and the resistor R5, the CONT pin of the 555 timer is connected to one end of the capacitor C3, and the other end of the capacitor C3 is grounded, and the OUT pin of the 555 timer is connected to the main control chip as the output end of the trigger circuit.

6. The compressor oil level detection and protection device according to claim 1, characterized in that: It also includes an inverting circuit connected between the trigger circuit and the main control chip, the input end of the inverting circuit is connected to the output end of the trigger circuit, the output end of the inverting circuit is connected to the main control chip, and when the input end of the inverting circuit receives a low-level signal, the output end of the inverting circuit outputs a high-level signal.

7. The compressor oil level detection and protection device according to claim 6, characterized in that: The inverting circuit includes: a resistor R7, a resistor R8, a resistor R9, a resistor R10, a capacitor C5, and an NPN transistor Q2; One end of the resistor R8 is connected to a power supply, the other end of the resistor R8 is connected to one end of the resistor R10, the other end of the resistor R10 is connected to the main control chip as the output end of the inverting circuit, one end of the capacitor C5 is connected to the other end of the resistor R10, and the other end of the capacitor C5 is grounded; The emitter of the NPN transistor Q2 is grounded, the collector of the NPN transistor Q2 is connected between the resistor R8 and the resistor R10, the base of the NPN transistor Q2 is connected to one end of the resistor R7, and the other end of the resistor R7 is connected to the output end of the trigger circuit as the input end of the inverter circuit; One end of the resistor R9 is connected between the resistor R7 and the base of the NPN transistor Q2 , and the other end of the resistor R9 is grounded.

8. A refrigeration device, characterized in that: The refrigeration equipment comprises the compressor oil level detection and protection device according to any one of claims 1 to 7.

9. The refrigeration equipment according to claim 8, characterized in that The refrigeration equipment is an air conditioner.

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