Refrigerant pump and its motor assembly

Abstract

The present invention discloses a refrigerant pump and its motor assembly. The refrigerant pump includes: a first housing; a second housing, sealingly connected to the first end of the first housing axially; a wiring housing cover, sealingly connected to the second end of the first housing axially; a motor assembly, including a motor, a first bearing bracket, and a second bearing bracket; the first bearing bracket and the second bearing bracket are coaxially and relatively fixed within the housing; the first bearing bracket forms a first accommodation cavity with an opening facing the second bearing bracket, and the second bearing bracket forms a second accommodation cavity with an opening facing the first bearing bracket; both ends of the motor extend into the first accommodation cavity and the second accommodation cavity respectively, and the side wall of the motor is partially covered and fixed by the first bearing bracket and the second bearing bracket. The present invention can simplify the assembly process of the motor and avoid affecting the performance of the motor due to assembly process problems.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration equipment, and particularly to a refrigerant pump and its motor assembly. Background Art

[0002] In the prior art, the normal operation of a refrigerant pump requires the drive of a motor. For such a closed fluid machine as a refrigerant pump, there is usually an interference fit between the motor stator and the housing, and the stator is generally placed in the housing by means of hot shrinking or cold pressing. During hot shrinking, the housing expands due to heat, resulting in an increase in the fit clearance. However, if the heat is unevenly distributed, the housing will expand and deform differently, and there will be an extrusion force after cooling. The extrusion force during the cold pressing of the motor stator is even greater, and the extrusion force has an adverse effect on the iron loss of the motor. Due to the existence of the extrusion force, the inner circular surface of the motor stator is deformed, resulting in poor roundness of the inner circular surface, which affects the noise during the operation of the motor and thus affects the performance of the motor. In addition, after the motor stator is assembled by hot shrinking, it is generally not forcibly pressed out and reassembled or reused for the second time. If it is forcibly pressed out, it may damage the stator laminations. Moreover, the friction between the interference-fitted stator and the housing is relatively large, and forcibly pressing out will cause a greater extrusion force on the laminations, thus having a very large impact on the performance of the motor, and at the same time causing waste of the motor assembly products, thereby increasing the operating cost of the enterprise.

[0003] In the utility model patent (application number: 201420769830.6) named "A New Type of Fully Enclosed Vane Refrigerant Pump", the motor is fixed to the pump body through a motor bracket. Those skilled in the art can know from the disclosed content that the motor and the motor bracket must be fixed by means of cold pressing or hot shrinking, and the motor bracket needs to be fixed to the front end cover and the rear end cover respectively. Compared with the prior art, this undoubtedly increases the difficulty of the assembly process and may have an adverse effect on the performance of the motor. Summary of the Invention

[0004] The purpose of the present invention is to provide a refrigerant pump and its motor assembly for the deficiencies in the above-mentioned prior art, so as to simplify the assembly process of the motor and avoid affecting the performance of the motor due to assembly process problems.

[0005] To achieve the above purpose, according to one aspect of the present invention, a refrigerant pump is provided, which includes:

[0006] A first housing;

[0007] A second housing, sealingly connected to the first end of the first housing in the axial direction;

[0008] A wiring housing cover, sealingly connected to the second end of the first housing in the axial direction;

[0009] The motor assembly includes a motor, a first bearing bracket, and a second bearing bracket; the first bearing bracket and the second bearing bracket are coaxially and relatively fixed within the housing; the first bearing bracket forms a first receiving cavity with an opening facing the second bearing bracket, and the second bearing bracket forms a second receiving cavity with an opening facing the first bearing bracket; both ends of the motor extend into the first receiving cavity and the second receiving cavity respectively, and the side wall of the motor is partially covered and fixed by the first bearing bracket and the second bearing bracket;

[0010] A drive shaft, which is in interference fit with the rotor of the motor; a first bearing and a second bearing are respectively provided on the first bearing bracket and the second bearing bracket; the first end of the drive shaft is connected to the first bearing, and the second end of the drive shaft is connected to the second bearing; and

[0011] An impeller, which is rotatably arranged in the second housing and connected to the first end of the drive shaft.

[0012] In an embodiment of the present invention, a first inner shoulder is provided at one end of the second housing facing the first housing, and a second inner shoulder is provided at the second end of the first housing in the axial direction; the first inner shoulder is attached to the end face of the first bearing bracket, and the second inner shoulder is attached to the end face of the second bearing bracket to prevent the motor assembly from generating axial displacement within the housing.

[0013] In an embodiment of the present invention, the first bearing bracket and the second bearing bracket are fixedly connected through a connecting member.

[0014] In an embodiment of the present invention, the outer wall of the bearing bracket is in interference fit with the inner wall of the first housing.

[0015] In an embodiment of the present invention, a plurality of first refrigerant through holes are provided on the first bearing bracket, and the second housing communicates with the receiving cavity through the first refrigerant through holes.

[0016] In an embodiment of the present invention, a plurality of second refrigerant through holes are provided on the second bearing bracket, and the receiving cavity communicates with the space between the wiring housing cover and the second bearing bracket through the second refrigerant through holes.

[0017] In an embodiment of the present invention, the second housing is provided with a refrigerant inlet and a refrigerant outlet, and the refrigerant flows into the refrigerant pump from the refrigerant inlet and only flows out from the refrigerant outlet.

[0018] In an embodiment of the present invention, an impeller docking portion communicating with the refrigerant inlet is provided within the second housing, and the impeller is rotatably connected to the impeller docking portion.

[0019] In an embodiment of the present invention, a sealed terminal is provided on the wiring housing cover, and the motor is connected to the sealed terminal through a lead wire.

[0020] According to another aspect of the present invention, a motor assembly is provided, characterized in that it includes a motor, a first bearing bracket, and a second bearing bracket; the first bearing bracket and the second bearing bracket are coaxially and relatively fixed; the first bearing bracket forms a first receiving cavity with an opening facing the second bearing bracket, and the second bearing bracket forms a second receiving cavity with an opening facing the first bearing bracket; both ends of the motor extend into the first receiving cavity and the second receiving cavity respectively, and the side wall of the motor is partially covered and fixed by the first bearing bracket and the second bearing bracket.

[0021] The present invention can avoid the direct contact between the motor and the housing during installation, simplify the assembly process of the motor, and further avoid the adverse effects on the motor caused by the housing squeezing the stator due to the traditional hot sleeve process, so as to ensure the performance of the motor. In addition, the motor in the present invention is installed and fixed through the first bearing bracket and the second bearing bracket, which is convenient and fast for disassembly, replacement, suitable for mass industrial production, and can also reduce the installation and use costs of the motor. Description of the Drawings

[0022] Other features, objects, and advantages of the present invention will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0023] Figure 1 is a perspective view of a refrigerant pump in an embodiment of the present invention.

[0024] Figure 2 is Figure 1 a cross-sectional view of the refrigerant pump shown.

[0025] Figure 3 is Figure 1 a schematic structural view of the motor assembly of the refrigerant pump shown.

[0026] Figure 4 is Figure 1 a schematic connection view of the first housing and the second housing in the refrigerant pump shown.

[0027] Figure 5 is Figure 1 a schematic structural view of the second bearing bracket in the refrigerant pump shown.

[0028] Figure 6 is Figure 1 a schematic view of the first angle of the second housing in the refrigerant pump shown.

[0029] Figure 7 is Figure 1Schematic diagram of the second angle of the second housing in the refrigerant pump shown.

[0030] Figure 8 is Figure 1 Schematic diagram of the first angle of the wiring housing cover in the refrigerant pump shown. And

[0031] Figure 9 is Figure 1 Schematic diagram of the second angle of the wiring housing cover in the refrigerant pump shown.

[0032] Reference numerals

[0033] 1 Wiring housing cover

[0034] 101 Sealed terminal

[0035] 102 Steel needle

[0036] 2 Second housing

[0037] 21 First inner shoulder

[0038] 201 Impeller docking part

[0039] 202 Refrigerant inlet

[0040] 203 Refrigerant outlet

[0041] 3 First housing

[0042] 31 Second inner shoulder

[0043] 4 Stator

[0044] 5 Rotor

[0045] 6 First bearing bracket

[0046] 61 First accommodation cavity

[0047] 62 First bearing mounting hole

[0048] 63 First refrigerant through hole

[0049] 64 First bearing

[0050] 7 Second bearing bracket

[0051] 74 Second bearing

[0052] 8 Drive shaft

[0053] 9 Impeller

[0054] 10 Support structure Detailed implementation manners

[0055] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. Like reference numerals in the figures denote like or similar structures and thus their repetitive description will be omitted.

[0056] Figure 1 is a perspective view of a refrigerant pump in an embodiment of the present invention. Figure 2 is Figure 1 a cross-sectional view of the refrigerant pump shown. Figure 3 is Figure 1 a schematic structural view of the motor assembly of the refrigerant pump shown. Figure 4 is Figure 1 a schematic structural view of the second bearing bracket in the refrigerant pump shown. Figure 5 is Figure 1 a schematic connection view of the first housing 3 and the second housing in the refrigerant pump shown. Figure 6 is Figure 1 a schematic view of a first angle of the second housing in the refrigerant pump shown. Figure 7 is Figure 1 a schematic view of a second angle of the second housing in the refrigerant pump shown. Figure 8 is Figure 1 a schematic view of a first angle of the wiring housing cover in the refrigerant pump shown. And Figure 9 is Figure 1 a schematic view of a second angle of the wiring housing cover in the refrigerant pump shown. According to one aspect of the present invention, a refrigerant pump is provided, as Figure 1-3As shown in the figure, it includes: a first housing 3, a second housing 2, a wiring housing cover 1, a motor assembly, and a drive shaft 8. The second housing 2 is sealingly connected to the first end of the first housing 3 in the axial direction; the wiring housing cover 1 is sealingly connected to the second end of the first housing 3 in the axial direction; the motor assembly includes a motor, a first bearing bracket 6, and a second bearing bracket 7. Among them, the motor can be a variable-frequency motor, and the motor includes a rotor 5 and a stator 4. The first bearing bracket 6 and the second bearing bracket 7 are coaxially and relatively fixed in the first housing 3 and the second housing; the first bearing bracket 6 forms a first receiving cavity 61 with an opening facing the second bearing bracket 7, and the second bearing bracket 7 forms a second receiving cavity with an opening facing the first bearing bracket 6; both ends of the motor extend into the first receiving cavity 61 and the second receiving cavity respectively, and the side wall of the motor is partially covered and fixed by the first bearing bracket 6 and the second bearing bracket 7; the drive shaft 8 is in interference fit with the rotor 5 of the motor; a first bearing 64 and a second bearing 74 are respectively provided on the first bearing bracket 6 and the second bearing bracket 7; the first end of the drive shaft 8 is connected to the first bearing 64, and the second end of the drive shaft 8 is connected to the second bearing 74; the impeller 9 is rotatably arranged in the second housing 2 and connected to the first end of the drive shaft 8.

[0057] The present invention can avoid the direct contact between the motor and the housing during installation, simplify the assembly process of the motor, and thus avoid the adverse effects on the motor caused by the housing squeezing the stator due to the traditional hot sleeve process, so as to ensure the service performance of the motor. In addition, the motor in the present invention is installed and fixed by the first bearing bracket and the second bearing bracket, which is convenient and fast for disassembly, replacement, suitable for large-scale industrial production, and can also reduce the installation and use costs of the motor. Moreover, the refrigerant pump proposed by the present invention can meet the transmission requirements of refrigerants in the field of refrigeration and air conditioning, and has the ability to operate continuously, stably and reliably. First, both ends of the first housing 3 in the present invention are sealingly connected to the wiring housing cover 1 and the second housing 2 respectively, which can effectively avoid refrigerant leakage compared with the pumps used in the existing refrigeration and air conditioning fields. Second, the motor in the present invention is fixed in the housing by the first bearing bracket 6 and the second bearing bracket 7, which can ensure the coaxiality between the motor and the housing and has high reliability. Third, the refrigerant pump of the present invention arranges both the refrigerant inlet and the refrigerant outlet on the second housing 2, which is beneficial to improving the refrigeration efficiency of the air conditioning system. Finally, the drive shaft 8 in the present invention is lubricated directly by the refrigerant with the first bearing and the second bearing 74, which can avoid the adverse effects on the heat exchange of the air conditioning system caused by the use of lubricating oil.

[0058] As Figure 4As shown, in an embodiment of the present invention, one end of the second housing 2 facing the first housing 3 is provided with a first inner shoulder 21, and the second end of the first housing 3 in the axial direction is provided with a second inner shoulder 31; the first inner shoulder 21 abuts against the end face of the first bearing bracket 6, and the second inner shoulder 31 abuts against the end face of the second bearing bracket 7. Thereby, axial displacement of the motor assembly in the housing can be prevented. Optionally, the outer wall of the bearing bracket is in interference fit with the inner wall of the first housing 3, thereby avoiding radial displacement of the motor in the first housing 3 and the second housing 2, preventing the motor from directly contacting the housing during installation, and further avoiding the adverse effects on the motor caused by the traditional hot sleeve process that makes the housing squeeze the stator 4, so as to ensure the performance of the motor.

[0059] Optionally, the first bearing bracket 6 and the second bearing bracket 7 are fixedly connected by a connecting member. Further, the connecting member can be a tie rod or a bolt.

[0060] As Figure 2 、 5 shown, the first bearing bracket 6 is provided with a plurality of first refrigerant through holes, and the second housing 2 communicates with the motor fixing cavity through the first refrigerant through holes. Part of the refrigerant in the second housing 2 flows into the motor fixing cavity through the first refrigerant through holes, which can cool the motor. The bearing can also be a oil-free bearing, and the refrigerant flowing into the motor fixing cavity replaces the lubricating oil to play a lubricating role, thus avoiding the adverse effects on the heat exchange of the air-conditioning system caused by the use of lubricating oil. Optionally, the first bearing bracket 6 is provided with a plurality of first refrigerant through holes, and the plurality of first refrigerant through holes are evenly distributed on the first bearing bracket 6, thereby promoting the circulation of the refrigerant in the first housing 3. Further, the second bearing bracket 7 is provided with a plurality of second refrigerant through holes, and the motor fixing cavity communicates with the space between the wiring housing cover 1 and the second bearing bracket 7 through the second refrigerant through holes. The refrigerant in the motor fixing cavity then flows to the wiring housing cover 1 through the second refrigerant through holes, actually further expanding the flowable space of the refrigerant and improving the high-pressure resistance performance of the pump. Optionally, the second bearing bracket 7 is provided with a plurality of second refrigerant through holes, and the plurality of second refrigerant through holes are evenly distributed on the second bearing bracket 7. Thereby, the circulation of the refrigerant in the entire refrigerant pump can be further promoted.

[0061] Please refer to Figures 1 to 8 , in the refrigerant pump of the present invention, the second housing 2 is provided with a refrigerant inlet 202 and a refrigerant outlet 203, and the refrigerant flows into the refrigerant pump from the refrigerant inlet 202 and only flows out from the refrigerant outlet 203. Arranging both the refrigerant inlet 202 and the refrigerant outlet 203 on the second housing 2 is beneficial to improving the refrigeration efficiency of the air-conditioning system.

[0062] As shown Figure 7 in FIG. 2, an impeller docking portion 201 communicating with the refrigerant inlet 202 is provided in the second housing 2, and the impeller 10 is rotatably connected to the impeller docking portion 201. Thereby, the transmission efficiency of the refrigerant can be improved.

[0063] As shown Figure 1 in FIGS. 1, 7 and 8, a sealed terminal 101 is provided on the wiring housing cover 1, and the motor is connected to the sealed terminal 101 through a lead wire. Further, the wiring housing cover 1 and the sealed terminal 101 may be integrally formed. Of course, the wiring housing cover 1 and the sealed terminal 101 may also be fixedly welded. As long as the two can be hermetically connected. A steel needle 102 is provided on the sealed terminal 101, and both ends of the steel needle 102 are used to connect the lead wire to connect the motor and an external power source. The steel needle 102 and the sealed terminal 101 are integrally formed, thereby avoiding refrigerant leakage from here.

[0064] Further, a plurality of support structures 10 may be provided outside the first housing 3. The provision of the support structures 10 is beneficial to the fixation of the pump.

[0065] The present invention can avoid the direct contact between the motor and the housing during installation, simplify the assembly process of the motor, and further avoid the adverse effects on the motor caused by the extrusion of the stator by the housing due to the traditional hot sleeve process, so as to ensure the use performance of the motor. In addition, the motor in the present invention is installed and fixed through the first bearing bracket and the second bearing bracket, and is convenient and quick to disassemble, replace, and is suitable for mass industrial production, and can also reduce the installation and use costs of the motor. Moreover, the refrigerant pump proposed by the present invention can meet the transmission requirements of refrigerants in the field of refrigeration and air conditioning, and has the ability to operate continuously, stably and reliably. First, the two ends of the first housing in the present invention are respectively hermetically connected to the wiring housing cover and the second housing, which can effectively avoid refrigerant leakage compared with the pumps used in the existing refrigeration and air conditioning fields. Second, the motor in the present invention is fixed in the housing through the first bearing bracket and the second bearing bracket, which can ensure the coaxiality between the motor and the housing and has high reliability. Third, the refrigerant pump of the present invention arranges both the refrigerant inlet and the refrigerant outlet on the second housing, which is beneficial to improving the refrigeration efficiency of the air conditioning system. Finally, the drive shaft in the present invention is lubricated directly by the refrigerant with the first bearing and the second bearing, which can avoid the adverse effects on the heat exchange of the air conditioning system caused by the use of lubricating oil.

[0066] According to another aspect of the present invention, there is provided an electric motor assembly, which includes an electric motor, a first bearing bracket 6 and a second bearing bracket 7; the first bearing bracket 6 and the second bearing bracket 7 are coaxially and relatively fixed; the first bearing bracket 6 is formed with a first accommodation cavity 61 with an opening facing the second bearing bracket 7, and the second bearing bracket 7 is formed with a second accommodation cavity with an opening facing the first bearing bracket (reference may be made to Figure 4 ); both ends of the electric motor extend into the first accommodation cavity 61 and the second accommodation cavity respectively, and the side wall of the electric motor is partially covered and fixed by the first bearing bracket 6 and the second bearing bracket 7. Among them, the electric motor can be a variable-frequency motor, and the electric motor includes a rotor 5 and a stator 4. The present invention can avoid the direct contact between the electric motor and the housing during installation, simplify the assembly process of the electric motor, and further avoid the adverse effects on the electric motor caused by the housing squeezing the stator due to the traditional hot sleeve process, so as to ensure the use performance of the electric motor. In addition, the electric motor in the present invention is installed and fixed by the first bearing bracket and the second bearing bracket, and the disassembly and replacement are convenient and fast, which is suitable for mass industrial production, and can also reduce the installation and use costs of the electric motor.

[0067] The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. A refrigerant pump, characterized in that, it comprises: a first housing; a second housing, sealingly connected to the first end of the first housing in the axial direction; a wiring housing cover, sealingly connected to the second end of the first housing in the axial direction; a motor assembly, including a motor, a first bearing bracket and a second bearing bracket; the first bearing bracket and the second bearing bracket are coaxially and relatively fixed within the housing; the first bearing bracket forms a first receiving cavity with an opening facing the second bearing bracket, and the second bearing bracket forms a second receiving cavity with an opening facing the first bearing bracket; both ends of the motor extend into the first receiving cavity and the second receiving cavity respectively, and the side wall of the motor is partially covered and fixed by the first bearing bracket and the second bearing bracket; a drive shaft, in interference fit with the rotor of the motor; a first bearing and a second bearing are respectively provided on the first bearing bracket and the second bearing bracket; the first end of the drive shaft is connected to the first bearing, and the second end of the drive shaft is connected to the second bearing; and an impeller, rotatably arranged in the second housing and connected to the first end of the drive shaft; wherein, the second housing is provided with a refrigerant inlet and a refrigerant outlet, and the refrigerant flows into the refrigerant pump from the refrigerant inlet and only flows out from the refrigerant outlet; the wiring housing cover is provided with a sealed terminal, and the motor is connected to the sealed terminal through a lead wire.

2. The refrigerant pump according to claim 1, characterized in that, a first inner shoulder is provided at one end of the second housing facing the first housing, and a second inner shoulder is provided at the second end of the first housing in the axial direction; the first inner shoulder fits against the end face of the first bearing bracket, and the second inner shoulder fits against the end face of the second bearing bracket to prevent the motor assembly from generating axial displacement within the housing.

3. The refrigerant pump according to claim 1 or 2, characterized in that, the first bearing bracket and the second bearing bracket are fixedly connected through a connecting member.

4. The refrigerant pump according to claim 1, characterized in that, the outer wall of the bearing bracket is in interference fit with the inner wall of the first housing.

5. The refrigerant pump according to claim 1, characterized in that, the first bearing bracket is provided with a plurality of first refrigerant through holes, and the second housing communicates with the receiving cavity through the first refrigerant through holes.

6. The refrigerant pump according to claim 5, characterized in that, the second bearing bracket is provided with a plurality of second refrigerant through holes, and the receiving cavity communicates with the space between the wiring housing cover and the second bearing bracket through the second refrigerant through holes.

7. The refrigerant pump according to claim 1, characterized in that, a impeller docking portion communicating with the refrigerant inlet is provided within the second housing, and the impeller is rotatably connected to the impeller docking portion.

8. A motor assembly, characterized in that, It includes a motor, a first bearing bracket and a second bearing bracket; the first bearing bracket and the second bearing bracket are coaxially and relatively fixed; the first bearing bracket forms a first receiving cavity with an opening facing the second bearing bracket, and the second bearing bracket forms a second receiving cavity with an opening facing the first bearing bracket; both ends of the motor extend into the first receiving cavity and the second receiving cavity respectively, and the side wall of the motor is partially covered and fixed by the first bearing bracket and the second bearing bracket; the first bearing bracket and the second bearing bracket are fixedly connected by a connecting piece; a number of first refrigerant through holes are provided on the first bearing bracket, and a number of second refrigerant through holes are provided on the second bearing bracket.

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