Compressor with double protection and heating and air conditioning device

Abstract

The utility model relates to a kind of compressor and heating equipment with double protection, compressor with double protection includes compressor shell, end cap, motor, first overload protector, second overload protector, thermal switch, the end cap seal cover is located on the compressor shell, the motor is set in the inside of the compressor shell, the motor leads out main winding, common line and auxiliary winding respectively, the first overload protector with the second overload protector is set in the inside of the end cap, the thermal switch is set in the outside of the end cap, the first overload protector with the common line and the auxiliary winding constitute first electric circuit, the second overload protector with the thermal switch, the main winding and the auxiliary winding constitute second electric circuit, the first electric circuit with the second electric circuit is connected in parallel arrangement.The utility model can effectively improve the reliability and security of compressor operation by double protection setting.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology, and in particular to a compressor and HVAC equipment with dual protection. Background Technology

[0002] A rotary compressor typically consists of an end cover, a housing, a motor fixed inside the housing that provides rotational power, and a pump that compresses the refrigerant. During operation, overload protection is generally achieved through an internal current protector. This protector works by generating heat when a large overload current passes through it, causing a bimetallic strip with a different coefficient of thermal expansion to bend. This causes the contact mechanism to spring open, disconnecting the compressor's power supply circuit. After the short circuit, as the overall internal temperature of the compressor decreases, the bimetallic strip returns to its original shape, and the contact mechanism re-engages, automatically closing the power supply circuit. However, the protector has a limited number of triggers. High temperatures combined with repeated opening and closing can eventually damage and cause the contact mechanism to stick together, preventing it from disconnecting. Therefore, when the compressor circuit is continuously energized and overloaded at high temperatures, there is a risk of deflagration in refrigeration systems using flammable or explosive refrigerants. Utility Model Content

[0003] Based on this, the purpose of this utility model is to overcome the shortcomings of the prior art and provide a compressor and HVAC equipment with dual protection, which can effectively improve the reliability and safety of the compressor during operation through the dual protection setting.

[0004] To achieve the above objectives, the first aspect of this utility model provides a compressor with dual protection, including a compressor housing, an end cover, a motor, a first overload protector, a second overload protector, and a thermal switch. The end cover is sealed on the compressor housing, and the motor is located inside the compressor housing. The motor has a main winding, a common wire, and an auxiliary winding respectively led out. The first overload protector and the second overload protector are respectively located inside the end cover, and the thermal switch is located outside the end cover. The first overload protector, the common wire, and the auxiliary winding form a first electrical circuit, and the second overload protector, the thermal switch, the main winding, and the auxiliary winding form a second electrical circuit. The first electrical circuit and the second electrical circuit are connected in parallel.

[0005] Wherein, the operating current threshold of the first overload protector is less than that of the second overload protector, and the operating current threshold of the second overload protector is less than that of the thermal switch. Therefore, according to this invention, a compressor with dual protection is achieved by respectively installing a first overload protector and a second overload protector with different operating currents inside the end cover, and connecting the motor's common line to the first overload protector and the motor's main winding to the second overload protector. In this way, the first overload protector acts as the first level of protection, operating according to the magnitude of the motor's common line current; the second overload protector and the thermal switch act as the second level of protection, operating according to the magnitude of the motor's main winding current. When the compressor is operating normally, neither the first nor the second overload protector will be affected. When the compressor is operating under abnormal overload, the first overload protector always activates before the second overload protector, until the first overload protector fails due to repeated activations. At this point, the second overload protector acts as a second layer of protection. When the compressor is again operating under abnormal overload, the second overload protector activates before the thermal switch, until the second overload protector fails due to repeated activations. The thermal switch, being a non-automatic reset switch, can cut off the compressor's electrical circuit in one go when triggered, preventing the compressor from continuing abnormal operation. In other words, this embodiment of the invention effectively improves the reliability and safety of the compressor operation through its dual protection system.

[0006] In one embodiment, the end cap is provided with a first terminal, a second terminal, and a third terminal. The first overload protector is electrically connected to the first terminal and the common line, the second overload protector is electrically connected to the second terminal and the main winding, the second terminal is electrically connected to the thermal switch, and the auxiliary winding is electrically connected to the third terminal.

[0007] In one embodiment, one end of the first terminal block penetrates through the end cover and extends into the interior of the end cover, and the end of the first terminal block extending into the end cover is provided with a first snap-fit ​​portion, and the first overload protector is provided with a first elastic snap-fit ​​groove, and the first snap-fit ​​portion engages with the first elastic snap-fit ​​groove.

[0008] In one embodiment, the first overload protector is provided with a first terminal and a second terminal. The first terminal is electrically connected to the common line, and the second terminal is electrically connected to one end of the first terminal that extends into the end cap.

[0009] In one embodiment, one end of the second terminal block penetrates through the end cover and extends into the interior of the end cover, and the end of the second terminal block extending into the end cover is provided with a second snap-fit ​​portion, and the second overload protector is provided with a second elastic snap-fit ​​groove, and the second snap-fit ​​portion engages with the second elastic snap-fit ​​groove.

[0010] In one embodiment, the second overload protector is provided with a third terminal and a fourth terminal. The third terminal is electrically connected to the main winding, and the fourth terminal is electrically connected to one end of the second terminal that extends into the end cap.

[0011] In one embodiment, the other end of the second terminal extends out of the end cap, and the end of the second terminal extending out of the end cap is electrically connected to the thermal switch via a wire.

[0012] In one embodiment, one end of the third terminal penetrates the end cover and extends into the interior of the end cover, and the end of the third terminal extending into the end cover is electrically connected to the auxiliary winding; the other end of the third terminal extends out of the end cover.

[0013] As one embodiment, a liquid reservoir is also included, which is disposed on the outer wall of the compressor housing.

[0014] A second aspect of this utility model provides a heating, ventilation, and air conditioning (HVAC) device comprising a compressor with dual protection as described in any of the preceding claims. The HVAC device according to this utility model effectively improves the reliability and safety of the compressor operation through the dual protection feature.

[0015] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a compressor with dual protection according to an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram showing the connection between the end cover of the compressor with dual protection and the motor according to an embodiment of the present invention.

[0018] Figure 3 This is one of the structural schematic diagrams of the end cover of a compressor with dual protection according to an embodiment of the present utility model;

[0019] Figure 4 This is a second schematic diagram of the end cover of the compressor with dual protection according to an embodiment of the present utility model;

[0020] Figure 5 This is the third schematic diagram of the end cover of the compressor with dual protection according to an embodiment of the present utility model;

[0021] Figure 6 This is a schematic diagram of the circuit principle of a compressor with dual protection according to an embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures:

[0023] 10. Compressor housing; 20. End cover; 21. First terminal; 22. Second terminal; 23. Third terminal; 30. Motor; 31. Main winding; 32. Common wire; 33. Auxiliary winding; 40. First overload protector; 50. Second overload protector; 60. Thermal switch; 70. Liquid receiver. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the described embodiments are merely some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0025] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms “a,” “the,” and “the” used in this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0026] In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims. In the description of this application, it should be understood that the terms "first," "second," "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0027] In related technologies, rotary compressors typically consist of end covers, a housing, a motor fixed inside the housing that provides rotational power, and a pump body that compresses the refrigerant. During operation, overload protection is generally achieved by installing a current protector inside the compressor. The protector works by the following principle: when a large overload current passes through it, the heat generated causes a bimetallic strip with a different coefficient of thermal expansion to bend, opening the contact mechanism and disconnecting the compressor's power supply circuit. After the short circuit, as the overall internal temperature of the compressor decreases, the bimetallic strip returns to its original shape, the contact mechanism re-engages, and the power supply circuit automatically closes. However, the protector has a limited number of triggers. High temperatures combined with repeated opening and closing eventually damage and stick the contact mechanism, preventing it from disconnecting. Therefore, when the compressor circuit is continuously energized and overloaded at high temperatures, there is a risk of deflagration in refrigeration systems using flammable and explosive refrigerants.

[0028] Therefore, this utility model embodiment provides a compressor and HVAC equipment with dual protection. The compressor and HVAC equipment with dual protection according to this utility model embodiment can effectively improve the reliability and safety of the compressor during operation through the dual protection feature.

[0029] Please see Figures 1 to 6 The first aspect of this utility model provides a compressor with dual protection, including a compressor housing 10, an end cover 20, a motor 30, a first overload protector 40, a second overload protector 50, and a thermal switch 60. The end cover 20 is sealed on the compressor housing 10. The motor 30 is located inside the compressor housing 10. The motor 30 has a main winding 31, a common line 32, and an auxiliary winding 33 respectively led out. The first overload protector 40 and the second overload protector 50 are respectively located inside the end cover 20. The thermal switch 60 is located outside the end cover 20. The first overload protector 40, the common line 32, and the auxiliary winding 33 form a first electrical circuit. The second overload protector 50, the thermal switch 60, the main winding 31, and the auxiliary winding 33 form a second electrical circuit. The first electrical circuit and the second electrical circuit are connected in parallel.

[0030] The operating current threshold of the first overload protector 40 is lower than that of the second overload protector 50, and the operating current threshold of the second overload protector 50 is lower than that of the thermal switch 60. Therefore, according to this invention, a compressor with dual protection is achieved by respectively setting a first overload protector 40 and a second overload protector 50 with different operating currents inside the end cover 20, connecting the common line 32 of the motor 30 to the first overload protector 40, and connecting the main winding 31 of the motor 30 to the second overload protector 50. In this way, the first overload protector 40 acts as the first level of protection, operating according to the current magnitude of the common line 32 of the motor 30; the second overload protector 50 and the thermal switch 60 act as the second level of protection, operating according to the current magnitude of the main winding 31 of the motor 30. When the compressor is running normally, the first overload protector 40 and the second overload protector 50... Neither of the two overload protectors 50 will be triggered. When the compressor is operating under abnormal overload, the first overload protector 40 always activates before the second overload protector 50, until the first overload protector 40 fails due to repeated activation. At this point, the second overload protector 50 acts as a second layer of protection. When the compressor is operating under abnormal overload again, the second overload protector 50 activates before the thermal switch 60, until the second overload protector 50 fails due to repeated activation. At this point, the thermal switch 60, as a non-automatic reset switch, can cut off the compressor's electrical circuit in one go when triggered, preventing the compressor from continuing to operate abnormally. In other words, this embodiment of the invention can effectively improve the reliability and safety of the compressor operation through dual protection settings.

[0031] In this embodiment of the utility model, the end cap 20 is provided with a first terminal 21, a second terminal 22 and a third terminal 23. The first overload protector 40 is electrically connected to the first terminal 21 and the common line 32, the second overload protector 50 is electrically connected to the second terminal 22 and the main winding 31, the second terminal 22 is electrically connected to the thermal switch 60, and the auxiliary winding 33 is electrically connected to the third terminal 23.

[0032] Specifically, one end of the first terminal 21 penetrates the end cover 20 and extends into the interior of the end cover 20. A first snap-fit ​​portion is provided at the end of the first terminal 21 extending into the end cover 20. The first overload protector 40 is provided with a first elastic snap-fit ​​groove, and the first snap-fit ​​portion engages with the first elastic snap-fit ​​groove. The first overload protector 40 is provided with a first terminal and a second terminal. The first terminal is electrically connected to the common line 32, and the second terminal is electrically connected to the end of the first terminal 21 extending into the end cover 20.

[0033] In this embodiment of the invention, one end of the second terminal 22 penetrates through the end cover 20 and extends into the interior of the end cover 20. A second snap-fit ​​portion is provided at the end of the second terminal 22 extending into the end cover 20, and the second overload protector 50 is provided with a second elastic snap-fit ​​groove. The second snap-fit ​​portion engages with the second elastic snap-fit ​​groove. The second overload protector 50 is provided with a third terminal and a fourth terminal. The third terminal is electrically connected to the main winding 31, and the fourth terminal is electrically connected to the end of the second terminal 22 extending into the end cover 20. Furthermore, the other end of the second terminal 22 extends out of the end cover 20, and this extended end is electrically connected to the thermal switch 60 via a wire.

[0034] In addition, one end of the third terminal 23 penetrates the end cover 20 and extends into the interior of the end cover 20, and the end of the third terminal 23 extending into the end cover 20 is electrically connected to the auxiliary winding 33; the other end of the third terminal 23 extends out of the end cover 20. The compressor with dual protection in this embodiment of the present invention also includes a liquid receiver 70, which is disposed on the outer wall of the compressor housing 10.

[0035] Both the first overload protector 40 and the second overload protector 50 can be conventional contact-type current protectors in this field, which will not be elaborated further here.

[0036] A second aspect of this utility model provides a heating, ventilation, and air conditioning (HVAC) device comprising a compressor with dual protection as described above. The HVAC device according to this utility model effectively improves the reliability and safety of the compressor during operation through the dual protection feature.

[0037] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of the compressor and HVAC equipment with dual protection of this utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

1. A compressor with dual protection, characterized in that: The system includes a compressor housing, an end cover, a motor, a first overload protector, a second overload protector, and a thermal switch. The end cover is sealed on the compressor housing. The motor is located inside the compressor housing and has a main winding, a common wire, and an auxiliary winding. The first and second overload protectors are located inside the end cover, and the thermal switch is located outside the end cover. The first overload protector, the common wire, and the auxiliary winding form a first electrical circuit. The second overload protector, the thermal switch, the main winding, and the auxiliary winding form a second electrical circuit. The first and second electrical circuits are connected in parallel.

2. The compressor with dual protection according to claim 1, characterized in that: The end cap is provided with a first terminal, a second terminal, and a third terminal. The first overload protector is electrically connected to the first terminal and the common line, the second overload protector is electrically connected to the second terminal and the main winding, the second terminal is electrically connected to the thermal switch, and the auxiliary winding is electrically connected to the third terminal.

3. The compressor with dual protection according to claim 2, characterized in that: One end of the first terminal block penetrates the end cover and extends into the interior of the end cover, and the end of the first terminal block extending into the end cover is provided with a first snap-fit ​​portion. The first overload protector is provided with a first elastic snap-fit ​​groove, and the first snap-fit ​​portion engages with the first elastic snap-fit ​​groove.

4. The compressor with dual protection according to claim 3, characterized in that: The first overload protector is provided with a first terminal and a second terminal. The first terminal is electrically connected to the common line, and the second terminal is electrically connected to one end of the first terminal that extends into the end cap.

5. The compressor with dual protection according to claim 2, characterized in that: One end of the second terminal block penetrates the end cover and extends into the interior of the end cover, and the end of the second terminal block extending into the end cover is provided with a second snap-fit ​​portion. The second overload protector is provided with a second elastic snap-fit ​​groove, and the second snap-fit ​​portion engages with the second elastic snap-fit ​​groove.

6. The compressor with dual protection according to claim 5, characterized in that: The second overload protector is provided with a third terminal and a fourth terminal. The third terminal is electrically connected to the main winding, and the fourth terminal is electrically connected to one end of the second terminal that extends into the end cap.

7. The compressor with dual protection according to claim 5, characterized in that: The other end of the second terminal extends out of the end cap, and the end of the second terminal extending out of the end cap is electrically connected to the thermal switch via a wire.

8. The compressor with dual protection according to claim 2, characterized in that: One end of the third terminal penetrates the end cap and extends into the interior of the end cap, and the end of the third terminal extending into the end cap is electrically connected to the auxiliary winding; the other end of the third terminal extends out of the end cap.

9. The compressor with dual protection according to claim 1, characterized in that: It also includes a liquid reservoir, which is disposed on the outer wall of the compressor housing.

10. A heating, ventilation, and air conditioning (HVAC) device, characterized in that: Includes a compressor with dual protection as described in any one of claims 1 to 9.

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