Rotary compressor

Abstract

This utility model relates to the field of compressor technology and provides a rotary compressor, including a pump body assembly, a motor assembly, and a heat exchanger. The pump body assembly includes a pump casing and a cylinder, piston, and crankshaft installed within the pump casing. A compression chamber is formed within the cylinder, and the piston is eccentrically mounted on the crankshaft, located within the compression chamber. The motor assembly includes a motor housing, a stator, and a rotor. The stator is fixed relative to the motor housing, and the crankshaft is mounted to the rotor, which can be inserted into the stator and rotate relative to it. The pump casing, heat exchanger, and motor housing are sequentially fixed along a first direction. The heat exchanger is filled with coolant and has a first through hole and a second through hole along the first direction. The refrigerant discharged from the pump body assembly can enter the motor housing through the first through hole, and the crankshaft is inserted into the second through hole. In this way, the refrigerant can be cooled by passing through the heat exchanger before entering the motor assembly, reducing the impact on the motor assembly's operation. Furthermore, the heat exchanger, sandwiched between the pump casing and the motor housing, occupies less space and has a simpler structure.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology, and in particular to a rotary compressor. Background Technology

[0002] Currently, most rotary compressors operate at high back pressure, meaning the refrigerant inside the casing is at high temperature and pressure. Therefore, strict requirements are placed on the motor temperature inside the casing, generally specifying that the exhaust temperature should not exceed 120℃. However, increasingly common applications may cause exhaust temperatures to rise, even exceeding 150℃. When excessively hot refrigerant enters the motor side, the ambient temperature of the motor's operating environment also rises, potentially leading to lubrication failure, thermal overload, increased copper losses, and other problems, thus affecting the reliability of motor operation.

[0003] Therefore, there is an urgent need for a rotary compressor to solve the above-mentioned technical problems. Utility Model Content

[0004] The purpose of this invention is to provide a rotary compressor that can reduce the temperature of the refrigerant entering the motor, maintain the reliable operation of the motor, and occupy less space with a simple structure.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] Rotary compressors, including:

[0007] The pump body assembly includes a pump housing and a cylinder, a piston, and a crankshaft installed in the pump housing. A compression chamber is formed in the cylinder, and the piston is installed on the eccentric part of the crankshaft. The piston is located in the compression chamber.

[0008] An electric motor assembly includes a motor housing, a stator, and a rotor, wherein the stator is fixed relative to the motor housing, the crankshaft is mounted to the rotor, and the rotor is capable of being inserted into the stator and rotating relative to the stator.

[0009] The heat exchanger, the pump housing, and the motor housing are sequentially fixed along a first direction. The heat exchanger is filled with coolant. The heat exchanger has a first through hole and a second through hole along the first direction. The refrigerant discharged from the pump assembly can enter the motor housing through the first through hole. The crankshaft is inserted into the second through hole.

[0010] As a preferred technical solution for the aforementioned rotary compressor, it further includes threaded fasteners, which are sequentially inserted into the motor housing, the heat exchanger, and the pump housing, and are threadedly connected to the pump housing.

[0011] As a preferred embodiment of the aforementioned rotary compressor, the motor housing includes a connecting lug for mounting the aforementioned threaded fastener.

[0012] As a preferred technical solution of the above-mentioned rotary compressor, multiple first through holes are provided, and the multiple first through holes are evenly distributed around the axis of the second through hole.

[0013] As a preferred technical solution of the above-mentioned rotary compressor, the heat exchanger is provided with a feed inlet and a discharge outlet. The feed inlet is used to deliver the coolant into the heat exchanger, and the discharge outlet is used to discharge the coolant from the heat exchanger.

[0014] As a preferred embodiment of the aforementioned rotary compressor, the aforementioned inlet and outlet are both located on both sides of the heat exchanger in the second direction and are exposed outside the aforementioned motor housing and the aforementioned pump housing; the aforementioned first direction is perpendicular to the aforementioned second direction.

[0015] As a preferred technical solution of the above-mentioned rotary compressor, the pump body assembly further includes an upper cylinder cover closed on the cylinder end face. The upper cylinder cover includes a main body and a journal protruding towards the motor side. The journal passes through the second through hole of the heat exchanger. The heat exchanger and the main body form a first cavity. The exhaust end of the pump body assembly and the first through hole of the heat exchanger are connected through the first cavity.

[0016] As a preferred technical solution of the above-mentioned rotary compressor, a boss is formed on the circumferential edge of the heat exchanger, and the boss abuts against the pump housing, so that the first cavity is formed between the inlet end of the first through hole and the exhaust end of the pump body assembly.

[0017] As a preferred technical solution of the above-mentioned rotary compressor, a second cavity is formed between the exhaust end of the first through hole and the stator and the rotor.

[0018] As a preferred embodiment of the above-mentioned rotary compressor, a seal is provided between the motor housing and the heat exchanger, and / or a seal is provided between the heat exchanger and the pump housing.

[0019] As a preferred technical solution for the aforementioned rotary compressor, the motor housing is welded and fixed to the heat exchanger, and the heat exchanger is welded and fixed to the pump housing.

[0020] The beneficial effects of this utility model are:

[0021] This utility model provides a rotary compressor, including a pump body assembly, a motor assembly, and a heat exchanger. The pump body assembly includes a pump housing, a cylinder, a piston, and a crankshaft mounted on the pump housing. A compression chamber is formed within the cylinder, and the piston is mounted on the eccentric portion of the crankshaft, located within the compression chamber. The motor assembly includes a motor housing, a stator, and a rotor. The stator is fixed relative to the motor housing, and the crankshaft is mounted to the rotor, which can be inserted into the stator and rotate relative to it. The pump housing, heat exchanger, and motor housing are sequentially fixed along a first direction. The heat exchanger is filled with coolant and has a first through hole and a second through hole along the first direction. The refrigerant discharged from the pump body assembly can enter the motor housing through the first through hole, and the crankshaft is inserted into the second through hole.

[0022] For example, in the motor assembly, the stator generates a magnetic field after receiving current. The rotor rotates around its own axis within this magnetic field, driving the crankshaft to rotate. The crankshaft then drives the piston to perform work in the compression chamber. During this work process, the refrigerant possesses high heat. The high-temperature refrigerant discharged from the pump assembly needs to pass through a heat exchanger via the first through-hole before entering the motor assembly. The heat exchanger is filled with coolant, the temperature of which is lower than that of the refrigerant discharged from the pump assembly. The refrigerant exchanges heat with the coolant through the wall of the first through-hole, thereby lowering the temperature of the refrigerant entering the motor assembly, reducing its impact on the motor assembly, and thus improving the operational stability of the motor assembly. Furthermore, the heat exchanger is sandwiched between the pump housing and the motor housing, occupying less space and having a simpler structure. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the rotary compressor provided in this embodiment of the utility model;

[0025] Figure 2 This is a schematic diagram of the heat exchanger provided in an embodiment of the present invention.

[0026] In the picture:

[0027] X, first direction; Y, second direction;

[0028] 100. Pump body assembly; 110. Pump casing; 120. Crankshaft; 130. First cavity; 140. Cylinder; 150. Piston;

[0029] 200. Motor assembly; 210. Motor housing; 220. Stator; 230. Rotor;

[0030] 300, Heat exchanger; 310, First through hole; 320, Second through hole; 330, Feed inlet; 340, Discharge outlet. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0032] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0035] like Figure 1 and Figure 2As shown, this utility model provides a rotary compressor, including a pump body assembly 100, a motor assembly 200, and a heat exchanger 300. The pump body assembly 100 includes a pump housing 110 and a cylinder 140, a piston 150, and a crankshaft 120 installed within the pump housing 110. A compression chamber is formed within the cylinder 140. The piston 150 is mounted on the eccentric portion of the crankshaft 120 and is located within the compression chamber. The motor assembly 200 includes a motor housing 210, a stator 220, and a rotor 230. The stator 220 is fixed relative to the motor housing 210, and the crankshaft 120 is mounted on the rotor 230. The sub-unit 230 can be inserted into the stator 220 and rotate relative to the stator 220; the pump housing 110, the heat exchanger 300 and the motor housing 210 are sequentially fixed along the first direction X; the heat exchanger 300 is filled with coolant; the heat exchanger 300 has a first through hole 310 and a second through hole 320 along the first direction X; the refrigerant discharged from the pump body assembly 100 can enter the motor housing 210 through the first through hole 310; and the crankshaft 120 is inserted into the second through hole 320.

[0036] For example, the stator 220 in the motor assembly 200 generates a magnetic field after receiving current. The rotor 230 rotates around its own axis within the magnetic field. The rotor 230 drives the crankshaft 120 to rotate, which in turn drives the piston 150 to perform work in the compression chamber. During this work process, the refrigerant has a high heat content. The high-temperature refrigerant discharged from the pump body assembly 100 needs to pass through the heat exchanger 300 through the first through hole 310 before entering the motor assembly 200. The heat exchanger 300 is filled with coolant, and the temperature of the coolant is lower than that of the refrigerant discharged from the pump body assembly 100. The refrigerant exchanges heat with the coolant through the wall of the first through hole 310, thereby lowering the temperature of the refrigerant entering the motor assembly 200, reducing its impact on the motor assembly 200, and improving the operational stability of the motor assembly 200. Furthermore, the heat exchanger 300 is sandwiched between the pump housing 110 and the motor housing 210, occupying less space and having a simpler structure.

[0037] Optionally, the rotary compressor also includes threaded fasteners, which are sequentially inserted through the motor housing 210, the heat exchanger 300 and the pump housing 110 and are threadedly connected to the pump housing 110.

[0038] For example, the threaded fastener includes a nut portion and a screw portion, which are fixedly connected. The nut portion of the threaded fastener is located on the side of the motor housing 210 facing away from the heat exchanger 300, and the screw portion passes through the motor housing 210 and the heat exchanger 300 in sequence, and is threadedly connected to the pump housing 110.

[0039] In other embodiments, the threaded fastener passes through the pump housing 110, the heat exchanger 300 and the motor housing 210 in sequence. That is, the nut part of the threaded fastener is located on the side of the pump housing 110 away from the heat exchanger 300, and the screw part passes through the pump housing 110 and the heat exchanger 300 in sequence and is threadedly connected to the motor housing 210.

[0040] Optionally, the motor housing 210 includes a connecting lug for mounting threaded fasteners.

[0041] For example, along the first direction X, the thickness of the connecting lug is less than the thickness of the motor housing 210, thereby reducing the length requirement of the threaded fastener.

[0042] For example, the motor housing 210 has a clearance groove. The length direction of the clearance groove is parallel to the first direction X, and the depth direction of the clearance groove is perpendicular to the first direction X. The side wall of the clearance groove near the heat exchanger 300 in the first direction X is the connecting lug.

[0043] Optionally, multiple first through holes 310 are provided, and these multiple first through holes 310 are evenly distributed around the axis of the second through hole 320. This arrangement allows the refrigerant discharged from the pump assembly 100 to enter the heat exchanger 300 through multiple first through holes 310, increasing the contact area between the refrigerant and the heat exchanger 300, i.e., increasing the indirect contact area between the refrigerant and the coolant inside the heat exchanger 300, thereby improving heat exchange efficiency. Furthermore, multiple first through holes 310 allow the refrigerant to pass through the heat exchanger 300 more dispersedly, further improving heat exchange efficiency. Additionally, multiple first through holes 310 can maintain the flow of refrigerant and stabilize the pressure value inside the pump assembly 100.

[0044] For example, a plurality of first through holes 310 are arranged in a circular pattern around the second through hole 320. Specifically, the plurality of first through holes 310 are arranged in at least two concentric circles.

[0045] Optionally, the heat exchanger 300 is provided with a feed inlet 330 and a discharge outlet 340. The feed inlet 330 is used to deliver coolant into the heat exchanger 300, and the discharge outlet 340 is used to discharge coolant from the heat exchanger 300.

[0046] As heat exchange occurs between the refrigerant and the heat exchanger 300, the heat absorbed by the coolant in the heat exchanger 300 gradually increases. The smaller the temperature difference between the coolant and the refrigerant discharged from the pump assembly 100, the lower the heat exchange efficiency. Therefore, in this embodiment, the refrigerant in the heat exchanger 300 can be replaced and circulated. That is, coolant at temperature T1 is injected into the heat exchanger 300 through the inlet 330, and coolant at temperature T2 is discharged through the outlet, where T1 < T2.

[0047] Furthermore, the heat exchanger 300 is equipped with a circulation assembly, which includes a circulation pump, a radiator, and pipes. The circulation pump and the radiator are connected between the inlet 330 and the outlet 340 via pipes. The circulation pump is used to create a pressure difference, so that the coolant in the heat exchanger 300 can be discharged from the outlet 340. New coolant can enter the heat exchanger 300 from the inlet 330. The coolant discharged from the heat exchanger 300 releases heat after entering the radiator and is then reinjected into the heat exchanger 300.

[0048] Furthermore, the rotary compressor also includes an adjustment assembly, which comprises a first valve body, a second valve body, a first sensor, a second sensor, and a third sensor. The first valve body is installed at the inlet 330 and is used to adjust the opening size and on / off state of the inlet 330. The second valve body is installed at the outlet 340 and is used to adjust the opening size and on / off state of the outlet 340. The first sensor is used to acquire the temperature T of the refrigerant discharged from the pump assembly 100 that has not entered the heat exchanger 300. A The second sensor is used to obtain the temperature T of the refrigerant entering the motor housing 210 after passing through the heat exchanger 300. B The third sensor is used to obtain the temperature T of the coolant inside the heat exchanger 300. C .

[0049] If, T B >T B阈 T B阈 To determine the maximum refrigerant temperature that the motor can withstand under normal operating conditions, the circulation speed of the circulating pump can be increased, or the power of the radiator can be increased to further reduce the temperature of the discharged coolant.

[0050] If, |T A -T C |=△T<△T 阈 , △T 阈 If the temperature difference threshold is reached, it indicates that the temperature of the coolant in the heat exchanger 300 is too high and close to the temperature of the refrigerant discharged from the pump assembly 100. This results in low heat exchange efficiency. In such cases, the circulation speed of the circulating pump should be increased, or the power of the radiator should be increased to further reduce the temperature of the discharged coolant.

[0051] Optionally, both the inlet 330 and the outlet are located on opposite sides of the heat exchanger 300 in the second direction Y, and are exposed outside the motor housing 210 and pump housing 110; the first direction X is perpendicular to the second direction Y. This arrangement facilitates the replacement of the coolant inside the heat exchanger 300 without affecting the use of the motor assembly 200 and pump assembly 100. It also prevents coolant leakage into the motor assembly 200 and / or pump assembly 100.

[0052] Optionally, the pump body assembly 100 further includes an upper cylinder head and a lower cylinder head, which are respectively enclosed at both ends of the cylinder 140. The upper cylinder head includes a main body and a journal protruding towards the motor side. The journal passes through the second through hole 320 of the heat exchanger 300. The heat exchanger 300 and the main body together form a first cavity 130. The exhaust end of the pump body assembly 100 and the first through hole 310 of the heat exchanger 300 are connected through the first cavity 130.

[0053] Optionally, a boss is formed on the circumferential edge of the heat exchanger 300, which abuts against the pump housing 110, so that a first cavity 130 is formed between the inlet end of the first through hole 310 and the exhaust end of the pump body assembly 100.

[0054] With this configuration, the refrigerant discharged from the pump assembly 100 can be evenly dispersed in the first cavity 130 before entering the first through hole 310, so that the refrigerant can fully contact the heat exchanger 300.

[0055] Optionally, the outer periphery of the main body of the upper cylinder head is fixed to the inner wall of the pump housing 110.

[0056] Optionally, the main body of the upper cylinder head extends outward in the radial direction and is clamped and fixed between the heat exchanger 300 and the pump casing 110.

[0057] For example, the journal extends into and is partially inserted into the rotor 230 of the motor.

[0058] Optionally, a second cavity is formed between the exhaust end of the first through hole 310 and the stator 220 and rotor 230.

[0059] With this configuration, the refrigerant discharged from the heat exchanger 300 can be dispersed in the second cavity before entering the motor assembly 200, thus avoiding localized overheating within the motor assembly 200.

[0060] Optionally, a seal is provided between the motor housing 210 and the heat exchanger 300, and / or a seal is provided between the heat exchanger 300 and the pump housing 110.

[0061] With this configuration, the connection gap between the motor housing 210 and the heat exchanger 300 can be sealed by the seal, and the connection gap between the heat exchanger 300 and the pump housing 110 can also be sealed by the seal.

[0062] Optionally, the motor housing 210 is welded to the heat exchanger 300, and the heat exchanger 300 is welded to the pump housing 110.

[0063] Thus, the motor housing 210, heat exchanger 300 and pump housing 110 are fixed by welding.

[0064] Furthermore, the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A rotary compressor, characterized in that, include: The pump body assembly (100) includes a pump housing (110) and a cylinder (140), a piston (150) and a crankshaft (120) installed in the pump housing (110). A compression chamber is formed in the cylinder (140), and the piston (150) is installed on the eccentric part of the crankshaft (120). The piston (150) is located in the compression chamber. The motor assembly (200) includes a motor housing (210), a stator (220) and a rotor (230), wherein the stator (220) is fixed relative to the motor housing (210), the crankshaft (120) is mounted to the rotor (230), and the rotor (230) is capable of being inserted into the stator (220) and rotating relative to the stator (220); The heat exchanger (300), the pump housing (110), the heat exchanger (300) and the motor housing (210) are sequentially fixed along a first direction (X). The heat exchanger (300) is filled with coolant. The heat exchanger (300) has a first through hole (310) and a second through hole (320) along the first direction (X). The refrigerant discharged by the pump assembly (100) can enter the motor housing (210) through the first through hole (310). The crankshaft (120) is inserted into the second through hole (320).

2. The rotary compressor according to claim 1, characterized in that, It also includes threaded fasteners, which are sequentially inserted through the motor housing (210), the heat exchanger (300) and the pump housing (110) and are threadedly connected to the pump housing (110).

3. The rotary compressor according to claim 1, characterized in that, The first through hole (310) has multiple openings, and the multiple first through holes (310) are evenly distributed around the axis of the second through hole (320).

4. The rotary compressor according to claim 1, characterized in that, The heat exchanger (300) has an inlet (330) and an outlet (340). The inlet (330) is used to supply the coolant into the heat exchanger (300), and the outlet (340) is used to discharge the coolant from the heat exchanger (300).

5. The rotary compressor according to claim 4, characterized in that, The feed inlet (330) and the discharge outlet (340) are both located on both sides of the heat exchanger (300) in the second direction (Y) and exposed outside the motor housing (210) and the pump housing (110); the first direction (X) is perpendicular to the second direction (Y).

6. The rotary compressor according to claim 1, characterized in that, The pump body assembly (100) also includes an upper cylinder cover enclosed on the end face of the cylinder (140). The upper cylinder cover includes a main body and a journal protruding toward the motor side. The journal passes through the second through hole (320) of the heat exchanger (300). The heat exchanger (300) and the main body together form a first cavity (130). The exhaust end of the pump body assembly (100) and the first through hole (310) of the heat exchanger (300) are connected through the first cavity (130).

7. The rotary compressor according to claim 6, characterized in that, The heat exchanger (300) has a boss formed on its circumferential edge, which abuts against the pump housing (110) to form the first cavity (130) between the inlet end of the first through hole (310) and the exhaust end of the pump body assembly (100).

8. The rotary compressor according to claim 1, characterized in that, The exhaust end of the first through hole (310) forms a second cavity between the stator (220) and the rotor (230).

9. The rotary compressor according to any one of claims 1-8, characterized in that, A seal is provided between the motor housing (210) and the heat exchanger (300), and / or a seal is provided between the heat exchanger (300) and the pump housing (110).

10. The rotary compressor according to any one of claims 1-8, characterized in that, The motor housing (210) is welded and fixed to the heat exchanger (300), and the heat exchanger (300) is welded and fixed to the pump housing (110).

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