CN113389737A

CN113389737A - Refrigerant pump

Info

Publication number: CN113389737A
Application number: CN202010168442.2A
Authority: CN
Inventors: 周易; 朱文杰; 石刚意; 刘君; 薛维超
Original assignee: Shanghai Highly Electrical Appliances Co Ltd
Current assignee: Shanghai Highly Electrical Appliances Co Ltd
Priority date: 2020-03-11
Filing date: 2020-03-11
Publication date: 2021-09-14

Abstract

The invention discloses a refrigerant pump, comprising: the integrated rack comprises a shell and a first bearing support, wherein the shell is provided with a motor fixing cavity, and the first bearing support is integrally formed at the axial first end of the motor fixing cavity; the first bearing bracket is provided with a first bearing; the pump shell is hermetically connected to the first end of the shell in the axial direction; the wiring shell cover is hermetically connected to the second axial end of the shell, and is provided with a sealed wiring terminal; the motor is arranged in the motor fixing cavity and is connected to the sealing binding post through a lead; the second bearing support is arranged at the second end of the motor fixing cavity; the second bearing bracket is provided with a second bearing; a drive shaft in interference fit with a rotor of the motor; 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. The invention can meet the transmission requirement of the refrigeration air-conditioning field on the refrigerant.

Description

Refrigerant pump

Technical Field

The invention relates to the field of refrigeration equipment, in particular to a refrigerant pump.

Background

In the prior art, a large-scale long refrigeration power electronic field such as an internet data center generally depends on a traditional compressor refrigeration system to cool equipment. However, in winter, the cooling of these equipments does not require a large cooling capacity, and if the compressor is continuously used for the refrigeration cycle, the energy waste is serious. In order to effectively utilize an external cold source, it is preferable that a transfer pump is used for a refrigeration cycle in winter and a compressor is used for a refrigeration cycle in summer.

Pumps for transporting refrigerants or refrigerant media in the field of refrigeration and air conditioning are mainly vane pumps and displacement pumps, typical examples of vane-type refrigerant pumps are centrifugal canned motor pumps and magnetic pumps, and typical examples of displacement refrigeration pumps are gear pumps. The centrifugal shield pump has low efficiency, the power is generally higher than 1000W, and the refrigerant is easy to leak due to structural limitation. The magnetic pump has low efficiency, the magnetic cylinder has high requirement on the neutrality, the bearing pressure of the magnetic cylinder is low and is generally lower than 25bar/16bar, and the cylinder is easy to burst to cause secondary pollution to the system. The gear pump has a short service life due to the bearing of radial load, and the gear is worn and chipped to form a secondary pollution system, particularly to a micro-channel heat exchanger of an air conditioning system, which is easy to cause the blockage of a small pipeline.

The utility model discloses a utility model patent for 201420769830.6 discloses a novel refrigerant pump of totally closed blade type, its the motor wire holder passes through O type sealing washer combination bolt and fixes with pump case. In fact, it is clear to those skilled in the art that the refrigerant liquid is very easy to vaporize, and for a refrigeration air conditioner requiring a long-term stable operation, the refrigerant in the refrigerant pump risks leaking outside and does not achieve a complete enclosure. Patent No. 201610542944.0 discloses a single-phase canned motor pump for refrigeration, in which the processing requirements of the canned motor are very high, and the canned motor pump for transporting the refrigerant is subject to the risk of internal leakage due to the physical properties of the refrigerant itself, i.e. the refrigerant enters the motor rotor area through the canned motor, which affects the performance and reliability of the entire pump. Accordingly, the complexity of the overall refrigerant pump is increased due to the influence of the shielding sleeve. The invention patent No. 201310271541.3 discloses a refrigerant pump, the gear box of the pump needs lubrication, but the existence of the lubricating oil can affect the heat exchange capability of the whole refrigeration air conditioner, and the connection terminal outside the shell also has the risk of refrigerant leakage.

The pumps are not specially designed for the characteristics of the field of refrigeration and air conditioning, the reliability is difficult to guarantee, and the energy-saving effect is not obvious. In the air conditioning system, the requirement of the pump on the using amount of the refrigerant is far greater than that of the compressor, and the difference of the requirement on the using amount of the refrigerant from the pump to the compressor is that the refrigerant is very easy to volatilize due to the property and the wide temperature and pressure change range, so that the refrigerant is very easy to generate serious faults such as cavitation, leakage and the like in the conveying process of the pump, and the normal heat exchange of the air conditioning system is influenced. In order to ensure the normal operation of the pump and reduce or avoid cavitation, the refrigerant needs to be frequently supplemented, so that the advantages of the pumps in the field of refrigeration and air conditioning are not obvious. Meanwhile, the internet data center and other occasions have extremely high requirements on environmental reliability, which requires that the refrigerant pump adopted in the air conditioning system has the capability of continuous, stable and reliable operation, and according to the above analysis, the refrigerant pump in the field is not designed for the transportation of media such as refrigerant at present. Therefore, the normal operation of the data center can be seriously threatened by dangers of refrigerant leakage, easy cavitation, high power consumption and the like in the application process.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, it is an object of the present invention to provide a refrigerant pump having a continuous, stable and reliable operation capability in an air conditioning system.

In order to achieve the purpose, the invention adopts the following technical scheme:

a refrigerant pump comprising:

the integrated rack comprises a shell and a first bearing support, wherein the shell is provided with a motor fixing cavity, and the first bearing support is integrally formed at the axial first end of the motor fixing cavity; the first bearing bracket is provided with a first bearing;

the pump shell is hermetically connected to the first end of the shell in the axial direction;

the wiring shell cover is hermetically connected to the second axial end of the shell, and is provided with a sealed wiring terminal;

the motor is arranged in the motor fixing cavity and is connected to the sealing binding post through a lead;

the second bearing support is arranged at the second end of the motor fixing cavity; the second bearing bracket is provided with a second bearing;

a drive shaft in interference fit with a rotor of the motor; a first end of the drive shaft is connected to the first bearing, and a second end of the drive shaft is connected to the second bearing; and

an impeller rotatably disposed within the pump housing and coupled to the first end of the drive shaft.

In an embodiment of the invention, the second bearing bracket is fixedly connected to an inner wall of the second end of the housing.

In an embodiment of the present invention, the first bearing support is provided with a plurality of first refrigerant circulation holes, and the pump shell is communicated with the motor fixing cavity through the first refrigerant circulation holes.

In an embodiment of the present invention, the second bearing bracket is provided with a plurality of second refrigerant circulation holes, and the motor fixing cavity is communicated with a space between the terminal housing cover and the second bearing bracket through the second refrigerant circulation holes.

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

In an embodiment of the present invention, an impeller abutting portion communicating with the refrigerant inlet is provided in the pump housing, and the impeller is rotatably connected to the impeller abutting portion.

In one embodiment of the present invention, the bearing is an oilless bearing.

In an embodiment of the present invention, the motor is a variable frequency motor.

In one embodiment of the invention, a plurality of support structures are provided outside the housing.

In one embodiment of the present invention, the terminal housing cover and the sealing terminal are integrally formed.

The refrigerant pump provided by the invention can meet the transmission requirement of the refrigeration air-conditioning field on the refrigerant, and has continuous, stable and reliable operation capability. The method comprises the following specific steps:

first, two ends of the shell are respectively connected with the wiring shell cover and the pump shell in a sealing mode, and compared with a pump used in the field of existing refrigeration air conditioners, the refrigerating fluid can be effectively prevented from leaking.

Secondly, the refrigerant pump provided by the invention has the advantages of simple and compact structure and fewer parts, and the impeller rotating at high speed can be circumferentially fixed by adopting an integral pump shell structure (namely, the shell and the first bearing bracket form an integral frame), so that the reliability is higher.

And the refrigerant inlet and the refrigerant outlet are arranged on the pump shell of the refrigerant pump, so that the refrigeration efficiency of the air-conditioning system is improved.

Finally, the driving shaft, the first bearing and the second bearing are directly lubricated by the refrigerant, so that the adverse effect on the heat exchange of the air conditioning system caused by using lubricating oil can be avoided.

Drawings

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

Fig. 1 is a schematic view showing a structure of a refrigerant pump according to an embodiment of the present invention.

FIG. 2 is a schematic view of the refrigerant pump of FIG. 1 with the housing at a first angle relative to the first bearing bracket.

FIG. 3 is a schematic view of the housing at a second angle to the first bearing bracket of the refrigerant pump of FIG. 1.

Fig. 4 is a structural schematic view of a second bearing bracket in the refrigerant pump of fig. 1.

Fig. 5 is a schematic view of a first angle of a pump casing in the refrigerant pump of fig. 1.

Fig. 6 is a schematic view of a second angle of the pump casing of the refrigerant pump of fig. 1.

Fig. 7 is a schematic view of a first angle of a cover of a wire connection housing in the refrigerant pump of fig. 1.

Fig. 8 is a schematic view of a second angle of a cover of a wire connection housing in the refrigerant pump of fig. 1. And

fig. 9 is a graph of the performance of the refrigerant pump of the present invention under various operating conditions.

Reference numerals

1 Wiring casing cover

101 sealed terminal

102 steel needle

2 Pump case

201 impeller butt joint part

202 refrigerant inlet

203 refrigerant outlet

3 stator

4 rotor

5 casing

51 fixed cavity of motor

6 supporting structure

7 drive shaft

81 first bearing

82 second bearing

91 first bearing bracket

911 first bearing mounting hole

912 first refrigerant flow hole

92 second bearing bracket

921 second bearing mounting hole

922 second refrigerant flow hole

10 impeller

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted.

Fig. 1 is a schematic view showing a structure of a refrigerant pump according to an embodiment of the present invention. FIG. 2 is a schematic view of the refrigerant pump of FIG. 1 with the housing at a first angle relative to the first bearing bracket. FIG. 3 is a schematic view of the housing at a second angle to the first bearing bracket of the refrigerant pump of FIG. 1. Fig. 4 is a structural schematic view of a second bearing bracket in the refrigerant pump of fig. 1. Fig. 5 is a schematic view of a first angle of a pump casing in the refrigerant pump of fig. 1. Fig. 6 is a schematic view of a second angle of the pump casing of the refrigerant pump of fig. 1. Fig. 7 is a schematic view of a first angle of the wire casing cover 1 in the refrigerant pump of fig. 1. And fig. 8 is a schematic view of a second angle of the wire casing cover 1 in the refrigerant pump of fig. 1. As shown in fig. 1 to 8, the present embodiment provides a refrigerant pump including an integrated housing, a pump case 2, a terminal case cover 1, a motor, a second bearing bracket 92, a drive shaft 7, and an impeller 10. The integrated rack comprises a shell 5 and a first bearing support 91, wherein the shell 5 is provided with a motor fixing cavity 51, and the first bearing support 91 is integrally formed at the axial first end of the motor fixing cavity 51. The first bearing bracket 91 is provided with a first bearing 81. The pump casing 2 is hermetically connected to a first axial end of the casing 5. The wiring shell cover 1 is connected to the second end of the shell 5 in the axial direction in a sealing mode, and the wiring shell cover 1 is provided with a sealing wiring terminal 101. The motor is arranged in the motor fixing cavity 51 and is connected to the sealing terminal 101 through a lead. The second bearing bracket 92 is disposed at a second end of the motor fixing chamber 51. The second bearing support 92 is provided with a second bearing 82. The drive shaft 7 is in interference fit with the rotor 4 of the motor. A first end of the drive shaft 7 is connected to the first bearing 81 and a second end of the drive shaft 7 is connected to the second bearing 82. The impeller 10 is rotatably disposed within the pump housing 2 and is connected to a first end of the drive shaft 7. The first bearing 81 is fixed to the first bearing holder 91 through a first bearing mounting hole 911 formed in the first bearing holder 91, and the second bearing 82 is fixed to the second bearing holder 92 through a second bearing mounting hole 921 formed in the second bearing holder 92.

The refrigerant pump provided by the invention can meet the transmission requirement of the refrigeration air-conditioning field on the refrigerant, and has continuous, stable and reliable operation capability. Firstly, two ends of the shell 5 are respectively connected with the wiring shell cover 1 and the pump shell 2 in a sealing way, so that the refrigerant can be effectively prevented from leaking compared with a pump used in the field of the existing refrigeration air-conditioning. Secondly, the refrigerant pump provided by the invention has simple and compact structure and fewer parts, and the impeller 10 rotating at high speed can be circumferentially fixed by adopting an integral pump shell structure (namely, the shell 5 and the first bearing bracket 91 form an integral frame), so that the reliability is higher. And thirdly, the refrigerant inlet and the refrigerant outlet are arranged on the pump shell 2 of the refrigerant pump, so that the refrigeration efficiency of the air-conditioning system is improved. Finally, the driving shaft 7, the first bearing 81 and the second bearing 82 are directly lubricated by the refrigerant, so that the adverse effect on the heat exchange of the air conditioning system caused by using lubricating oil can be avoided.

As shown in fig. 1 to 3, the second bearing bracket 92 is fixedly connected to the inner wall of the second end of the housing 55 of the integrated housing. Wherein the second bearing bracket 92 may be welded and fixed with the second end of the housing 5. Of course, the second bearing bracket 92 may also be attached to the second end of the housing 5 by an epoxy sealant. Of course, the relative positions of the first bearing bracket 91 and the second bearing 82 are not limited to those shown in fig. 1. That is, in some embodiments, the first bearing bracket 91 may be fixedly connected to the housing 5, and the second bearing bracket 92 may be integrally formed with the housing 5. This facilitates both the ensuring of the coaxiality of the first bearing bracket 91 with the second bearing bracket 92 and the housing 5 and the mounting of the electric motor. The motor includes a stator 3 fixed to the motor fixing chamber 51 and a rotor 4 connected to the driving shaft 7. In addition, in order to make the connection between the second bearing bracket 92 and the housing 5 more stable in this embodiment, an end of the housing 5 facing away from the first bearing bracket 91 extends in the axial direction to form a flange portion, and the inner diameter of the flange portion is larger than that of the motor fixing cavity 51. The second bearing bracket 92 is fitted into the flange portion and is welded and fixed to the flange portion.

As shown in fig. 2 and 3, a plurality of first refrigerant circulation holes 912 are formed in the first bearing bracket 91 of the integrated frame, and the pump housing 2 is communicated with the motor fixing cavity 51 through the first refrigerant circulation holes 912. Part of the refrigerant in the pump housing 2 flows into the motor fixing chamber 51 through the first refrigerant circulation hole 912, and may cool the motor. The bearing can also be an oilless bearing, and the refrigerant flowing into the motor fixed cavity 51 replaces lubricating oil to play a role in lubrication, so that adverse effects on heat exchange of an air conditioning system due to the use of the lubricating oil are avoided. Optionally, the first bearing bracket 91 is provided with a plurality of first refrigerant circulation holes 912, and the plurality of first refrigerant circulation holes 912 are uniformly distributed on the first bearing bracket 91, so that the refrigerant can be promoted to circulate in the housing. Further, a plurality of second refrigerant circulation holes 922 are formed in the second bearing bracket 92, and the motor fixing cavity 51 is communicated with a space between the connection housing cover 1 and the second bearing bracket 92 through the second refrigerant circulation holes 922. The refrigerant in the motor fixing cavity 51 flows to the connection housing cover 1 through the second refrigerant circulation hole 922, so that the flowing space of the refrigerant is further enlarged, and the high pressure resistance of the pump is improved. Optionally, a plurality of second refrigerant circulation holes 922 are formed in the second bearing support 92, and the second refrigerant circulation holes 922 are uniformly distributed on the second bearing support 92. This can further promote the circulation of the refrigerant in the entire refrigerant pump.

Referring to fig. 1 to 8, in the refrigerant pump of the present invention, the pump 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 flows out only from the refrigerant outlet 203. And the refrigerant inlet and the refrigerant outlet are arranged on the pump shell, so that the refrigerating efficiency of the air-conditioning system is improved.

In an embodiment of the present invention, an impeller abutting portion 201 communicating with the refrigerant inlet 202 is provided in the pump housing 2, and the impeller 10 is rotatably connected to the impeller abutting portion 201. Whereby the transfer efficiency of the refrigerant can be improved.

In this embodiment, the motor may be a variable frequency motor. Fig. 9 is a graph of the performance of the refrigerant pump of the present invention under various operating conditions. As shown in fig. 9, a conventional refrigerant pump n₂The optimal operation interval at the rotating speed is an AB section. The refrigerant pump using the variable frequency motor has the rotating speed of n₁Is adjusted to n₂The high efficiency interval of the pump becomes ABCD. Therefore, the refrigerant pump using the variable frequency motor can be suitable for a refrigerating system with complicated and changeable working conditions.

As shown in fig. 1, a plurality of support structures 6 may be disposed outside the housing 5. The support structure 6 is provided to facilitate the fixing of the pump. In some preferred embodiments of the present invention, the housing 5 is externally disposed on a first supporting structure 6 and a second supporting structure 6, and the outer wall of the first supporting structure 6 is welded and fixed to the first end of the housing 5 and the pump housing 2, that is, the first supporting structure 6 is fixed to the joint between the housing 5 and the pump housing 2, so that the connection between the housing 5 and the pump housing 2 and the connection housing cover 1 is more stable, and the risk of refrigerant leakage is reduced. Of course, the above examples are not intended to limit the installation manner and location of the support structure 6.

Further, as shown in fig. 1, 7 and 8, the terminal cover 1 may be integrally formed with the hermetic terminal 101. Of course, the terminal housing cover 1 can also be welded to the sealing terminal 101. As long as the two can be hermetically connected. The sealed wiring terminal 101 is provided with a steel needle 102, and two ends of the steel needle 102 are used for connecting a lead wire to connect a motor and an external power supply. The steel pin 102 is integrally formed with the sealing post 101, so that leakage of refrigerant therefrom can be prevented.

In summary, the refrigerant pump provided by the invention can meet the transmission requirement of the refrigeration air-conditioning field on the refrigerant, and has continuous, stable and reliable operation capability. Firstly, two ends of the shell 5 are respectively connected with the wiring shell cover 1 and the pump shell 2 in a sealing way, so that the refrigerant can be effectively prevented from leaking compared with a pump used in the field of the existing refrigeration air-conditioning. Secondly, the refrigerant pump provided by the invention has simple and compact structure and fewer parts, and the impeller 10 rotating at high speed can be circumferentially fixed by adopting an integral pump shell structure (namely, the shell 5 and the first bearing bracket 91 form an integral frame), so that the reliability is higher. And thirdly, the refrigerant inlet and the refrigerant outlet are arranged on the pump shell 2 of the refrigerant pump, so that the refrigeration efficiency of the air-conditioning system is improved. Finally, the driving shaft 7, the first bearing 81 and the second bearing 82 are directly lubricated by the refrigerant, so that the adverse effect on the heat exchange of the air conditioning system caused by using lubricating oil can be avoided.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims

1. A refrigerant pump, comprising:

2. The refrigerant pump as recited in claim 1, wherein said second bearing support is fixedly attached to an inner wall of said housing second end.

3. The refrigerant pump as claimed in claim 1, wherein the first bearing bracket is provided with a plurality of first refrigerant circulation holes, and the pump housing is communicated with the motor fixing chamber through the first refrigerant circulation holes.

4. The refrigerant pump as claimed in claim 3, wherein a plurality of second refrigerant circulation holes are formed in the second bearing bracket, and the motor fixing chamber communicates with a space between the terminal housing cover and the second bearing bracket through the second refrigerant circulation holes.

5. The refrigerant pump as claimed in claim 1, wherein said pump housing has a refrigerant inlet and a refrigerant outlet, and the refrigerant flows into the refrigerant pump from said refrigerant inlet and flows out only from said refrigerant outlet.

6. A refrigerant pump as claimed in claim 5, wherein an impeller docking portion communicating with said refrigerant inlet is provided in said pump housing, said impeller being rotatably connected to said impeller docking portion.

7. The refrigerant pump as recited in claim 1, wherein said bearing is an oilless bearing.

8. The refrigerant pump as recited in claim 1, wherein said motor is an inverter motor.

9. The refrigerant pump as recited in claim 1, wherein a plurality of support structures are provided external to said housing.

10. The refrigerant pump as recited in claim 1, wherein said terminal housing cover is integrally formed with said sealing terminal.