TWI444539B - Coolant pump of magnetic levitation type - Google Patents

Description

Magnetic floating liquid refrigerant pump

This proposal relates to a liquid refrigerant pump, in particular a magnetic floating liquid refrigerant pump.

In the cooling circulation system using the coolant, the most important key component is the refrigerant liquid pump that prevents coolant leakage. Pump devices commonly used in the industry cause losses in the production process due to leakage of the shaft seal. If the coolant is a highly toxic chemical, it will cause irreparable damage to the environment, land and workers. Since the refrigerant is operated at a relatively high pressure, it is quite difficult to make the delivery pump absolutely leak-free. Most of the current solutions to this demand are either Canned Pumps or Seal-less Pumps. Among them, the shield pump can avoid the problem of coolant leakage because there is no shaft seal. Therefore, the use rate of shielded pumps in chemical plants has become more and more common, and their development and application have received more and more attention.

Although the shield pump has the above advantages, the shield pump uses a sliding bearing, so the refrigerant usually has to be added with a certain proportion of lubricating oil. Therefore, the refrigerant must have good oil miscibility before it can be mixed with the lubricating oil, which in turn causes limitations in the selection of the refrigerant.

In addition, the lubricating oil in the refrigerant will remain in the pipeline somewhat, which will cause the cooling pipeline to clog, thereby making the cooling system less efficient and increasing the power load consumption of the cooling system. Moreover, the long-term friction between the sliding bearing and the rotor is liable to cause wear of the sliding bearing, which will easily cause vibration and damage the rotor and the impeller. Moreover, since the sliding bearing is in direct contact with the rotor, it is also easy to rub and cause energy loss. In addition, when the refrigerant liquid pump is assembled, assembly errors may occur more or less. As a result, the assembly position of the rotor may be biased, so that the operation of the refrigerant liquid pump is not smooth, thereby affecting the service life of the refrigerant liquid pump.

The proposal is to provide a magnetic floating liquid refrigerant pump, which can eliminate the problems caused by adding lubricating oil in the refrigerant, avoid the wear phenomenon caused by the direct contact between the bearing and the rotor, and avoid the influence of assembly error, thereby improving the service life. .

The magnetic floating liquid refrigerant pump disclosed in the present proposal comprises a rotating module, a first bearing module, a second bearing module and a pump module. The rotating module comprises a casing, a rotating shaft, a first radial magnetic bearing rotor, a second radial magnetic bearing rotor and a thrust disk. The housing is provided with a motor stator, and the rotating shaft pivots the housing. The rotating shaft is provided with a motor rotor corresponding to the motor stator, and the rotating shaft has a first end and a second end. The first radial magnetic bearing rotor is disposed at the first end, the second radial magnetic bearing rotor is disposed at the second end, and the thrust disk is disposed at the second end. The first bearing module is disposed on the rotating module, and the first bearing module includes a first radial magnetic bearing housing corresponding to the first radial magnetic bearing rotor. The second bearing module is disposed on the rotating module, and the first bearing module and the second bearing module are located on opposite sides of the rotating module. The second bearing module comprises a second radial magnetic bearing bearing, a first axial magnetic bearing, a second axial magnetic bearing and an axial spacing adjusting ring. The second radial magnetic bearing corresponding to the second radial magnetic bearing rotor, the second axial magnetic bearing and the first axial magnetic bearing maintain a distance, the thrust disk is between the first axial magnetic bearing and the second axial magnetic floating Between the bearings. The axial spacing adjustment ring is interposed between the first axial magnetic bearing and the second axial magnetic bearing, so that the first axial magnetic bearing and the second axial magnetic bearing maintain the aforementioned distance. The pump module is connected to the rotating shaft, and the rotating shaft drives the pump module to operate.

According to the magnetic floating type liquid refrigerant pump disclosed in the above proposal, the above-mentioned magnetic floating structure design is used to eliminate the problem of friction loss, thereby improving the life of the magnetic floating type liquid refrigerant pump. Therefore, the working medium of the magnetic floating type liquid refrigerant pump does not need to add additional lubricating oil, so it can be applied to various refrigerants and improve system efficiency. Moreover, by replacing the axial spacing adjustment rings of different thicknesses, the engineering personnel can adjust the axial clearance between the thrust disk and the axial magnetic bearing to compensate for the assembly error of the magnetic floating liquid refrigerant pump.

The features, implementation and efficacy of this proposal are described in detail below with reference to the preferred embodiment of the drawings.

Please refer to FIG. 1 together. FIG. 1 is a cross-sectional view showing the structure of a magnetic floating type liquid refrigerant pump according to an embodiment of the present proposal.

The magnetic floating liquid refrigerant pump 10 disclosed in the present proposal comprises a rotary module 100, a first bearing module 200, a second bearing module 300 and a pump module 400. The rotating module 100 includes a housing 110 and a rotating shaft 130. The housing 110 is provided with a motor stator 120, which may be an electromagnet. The rotating shaft 130 is pivotally disposed on the housing 110, and the rotating shaft 130 is provided with a motor rotor 140. The motor rotor 140 includes a plurality of silicon steel sheets or permanent magnets corresponding to the motor stator 120. The motor stator 120 drives the motor rotor 140 to rotate by electromagnetism to drive the rotating shaft 130 to pivot relative to the housing 110.

The rotating shaft 130 has a first end 1301 and a second end 1302. The first radial magnetic bearing housing rotor 151 is disposed around the first end 1301, and the second radial magnetic bearing rotor 152 is disposed around the second end 1302. The motor rotor 140 is interposed between the first radial magnetic bearing rotor 151 and the second radial magnetic bearing rotor 152. The first radial magnetic bearing rotor 151 and the second radial magnetic bearing rotor 152 may each include a plurality of silicon steel sheets, but not limited thereto. In addition, the thrust plate 160 of the embodiment includes at least one magnetic conductive material, and the thrust plate 160 has a disk-shaped outer shape, but is not limited thereto. The thrust plate 160 is fixed at an end edge of the second end 1302 of the rotating shaft 130 such that the second radial magnetic bearing rotor 152 is interposed between the thrust disk 160 and the motor rotor 140. Moreover, in this embodiment or other embodiments, the thrust plate 160 is locked to the second end 1302 of the rotating shaft 130 through a locking member 132. Moreover, a spacer ring 134 is further disposed between the locking member 132 and the thrust plate 160 such that the thrust plate 160 is firmly fixed to the second end 1302 of the rotating shaft 130 by the pressing of the spacer ring 134.

The first bearing module 200 is disposed on the rotating module 100. The first bearing module 200 includes a first radial magnetic bearing housing 220 corresponding to the first radial magnetic bearing rotor 151 on the first end 1301 of the rotating shaft 130. The first radial magnetic bearing housing 220 includes a first radial magnetic bearing 221 and a coil 222 surrounding the first radial magnetic bearing 221 to form an electromagnet. The first radial magnetic bearing housing 220 and the first radial magnetic bearing housing rotor 151 face each other so that the first end 1301 of the rotating shaft 130 is suspended by the first radial magnetic bearing rotor 151. A radial magnetic bearing housing 220. Furthermore, the first end 1301 of the rotating shaft 130 is pivotally disposed on the first radial magnetic bearing housing 220 and is not in contact with the first radial magnetic bearing housing 220.

In addition, the second bearing module 300 is disposed on the rotating module 100 , and the first bearing module 200 and the second bearing module 300 are located on opposite sides of the rotating module 100 . The second bearing module 300 includes a second radial magnetic bearing housing 320, a first axial magnetic bearing 350, a second axial magnetic bearing 360, and an axial spacing adjustment ring 380. The second radial magnetic bearing housing 320 corresponds to the second radial magnetic bearing rotor 152. The second radial magnetic bearing housing 320 includes a second radial magnetic bearing 321 and a coil 322 surrounding the second radial magnetic bearing 321 to form an electromagnet. The second radial magnetic bearing housing 320 and the second radial magnetic bearing rotor 152 are attracted to each other so that the second end 1302 of the rotating shaft 130 is suspended by the second radial magnetic bearing rotor 152. The radial magnetic bearing housing 320 is inside. Furthermore, the second end 1302 of the rotating shaft 130 is pivotally disposed on the second radial magnetic bearing housing 320 and is not in contact with the second radial magnetic bearing housing 320. Wherein, the first radial magnetic bearing housing 220 and the second radial magnetic bearing housing 320 provide radial suspension of the rotating shaft 130, so that the rotating shaft 130 can be rotated at a fixed radial position.

Moreover, the axial spacing adjustment ring 380 is interposed between the first axial magnetic bearing 350 and the second axial magnetic bearing 360 in a detachable replacement relationship, so that the first axial magnetic bearing 350 and the second axial magnetic floating Bearing 360 maintains a distance. Both the first axial magnetic bearing 350 and the second axial magnetic bearing 360 can be an electromagnet. The thrust disc 160 is interposed between the first axial maglev bearing 350 and the second axial maglev bearing 360, and the axial spacing adjustment ring 380 surrounds the thrust disc 160. The magnetic poles of the thrust disk 160 facing the first axial magnetic bearing 350 are attracted, and the magnetic poles facing the thrust disk 160 and the second axial magnetic bearing 360 are also attracted. In this way, the thrust disc 160 is held between the first axial maglev bearing 350 and the second axial maglev bearing 360 by the principle of magnetic attraction, and is not related to the first axial maglev bearing 350 and the second shaft. Contact with the magnetic bearing 360. Furthermore, the first axial maglev bearing 350 and the second axial maglev bearing 360 limit the axial freedom of the rotating shaft 130, so that the rotating shaft 130 can be rotated while maintaining a fixed axial position. Wherein, since the axial spacing adjusting ring 380 is interposed between the first axial magnetic bearing 350 and the second axial floating bearing 360 in a detachable replacement relationship, the axial spacing adjusting ring 380 can be replaced or corrected. The thickness of the first axial maglev bearing 350 and the second axial maglev bearing 360 are varied to adjust the axial gap between the thrust disc 160 and the first axial maglev bearing 350 or the second axial maglev bearing 360. .

In addition, the first end 1301 of the rotating shaft 130 is connected to the pump module 400. In this embodiment or other embodiments, the pump module 400 further includes a pump housing 410 and a pump impeller 420. The pump housing 410 is coupled to the housing 110, and the pump impeller 420 is coupled to the first end 1301 of the rotating shaft 130. The rotating shaft 130 drives the pump impeller 420 to rotate.

With the above-mentioned magnetic floating structure design, when the rotating shaft 130 of the embodiment drives the pump module 400 to operate, the rotating shaft 130 does not directly contact the first bearing module 200 and the second bearing module 300. This will eliminate the problem of friction loss to improve the life of the magnetic floating liquid refrigerant pump 10. Moreover, the magnetic floating structure design makes the working medium (refrigerant) of the magnetic floating liquid refrigerant pump 10 do not need to add additional lubricating oil, so that it can be applied to various refrigerants and improve system efficiency.

In addition, since the first radial magnetic bearing housing 220, the motor stator 120 and the second radial magnetic bearing housing 320 of the embodiment have appropriate separation distances, the problem of magnetic field interference between each other can be eliminated to improve The operational stability of the magnetic floating liquid refrigerant pump 10. Moreover, the distance between the first axial maglev bearing 350 and the second axial maglev bearing 360 can be adjusted by replacing or correcting the thickness of the axial spacing adjusting ring 380. Such a design can facilitate the adjustment of the thrust plate 160 by an engineer. An axial gap with the first axial magnetic bearing 350 or the second axial magnetic bearing 360 is used to correct the axial error generated by the magnetic floating liquid refrigerant pump 10 during assembly.

Please refer to "FIG. 1" in conjunction with "FIG. 2", which is a partial schematic view of a magnetic floating type liquid refrigerant pump according to an embodiment of the present proposal. In the embodiment or other embodiments, the first bearing module 200 further includes a first magnetic bearing housing 210. The first magnetic bearing housing 210 is disposed on one side of the housing 110, and the first radial magnetic bearing housing 220 The system can be fixed in the first magnetic bearing housing 210. In addition, the second bearing module 300 further includes a second magnetic bearing housing 310 and an end cover 370. The second magnetic bearing housing 310 is disposed on the other side of the housing 110 such that the second magnetic bearing housing 310 and the first The magnetic bearing housings 210 are located on opposite sides of the housing 110. The second radial magnetic bearing housing 320 and the first axial magnetic bearing 350 may be fixed in the second magnetic bearing housing 310. It is worth mentioning that the second axial magnetic bearing 360 and the axial spacing adjustment ring 380 are disposed in the second magnetic bearing shell 310 in a detachable relationship, and the end cover 370 is disposed in the second magnetic bearing in a detachable relationship. One side of the outer casing 310, the end cover 370 and the second magnetic bearing shell 310 together cover the second radial magnetic bearing housing 320, the first axial magnetic bearing 350, the second axial magnetic bearing 360 and the axial spacing adjustment Ring 380.

As shown in Fig. 2, when the engineer wants to change or correct the size of the axial spacing adjusting ring 380, the end cap 370 can be removed from the second magnetic bearing shell 310, and then the second The axial magnetic bearing 360 and the axial spacing adjusting ring 380 are sequentially taken out from the second magnetic bearing housing 310 to replace the axial spacing adjusting ring 380 to adjust the thrust disk 160 and the first axial magnetic bearing 350 or the second The axial gap between the axial magnetic bearings 360.

Please continue to refer to "Figure 1". In the embodiment or other embodiments, the first bearing module 200 further includes a sensor 230. The rotating module 100 further includes a sensing target 171 disposed on the first end 1301 of the rotating shaft 130. The sensing target 171 corresponds to the sensor 230 to cause the sensor 230 to detect the displacement amount of the first end 1301 of the rotating shaft 130 to determine whether the rotating shaft 130 is accurately controlled at the target position. The second bearing module 300 further includes a sensor 330. The rotation module 100 further includes another sensing target 172 disposed on the second end 1302 of the rotating shaft 130. The sensing target 172 corresponds to the sensor 330 to cause the sensor 330 to detect the displacement amount of the second end 1302 of the rotating shaft 130 to determine whether the rotating shaft 130 is accurately controlled at the target position.

In addition, in the embodiment or other embodiments, the rotating module 100 further includes a shielding layer 111 covering the motor stator 120. The first bearing module 200 further includes a shielding layer 211 covering the first radial direction. The magnetic bearing housing 220, the second bearing module 300 further includes a shielding layer 311 covering the second radial magnetic bearing housing 320. The material of the shielding layers 111, 211, and 311 may be a resin. The motor stator 120, the first radial magnetic bearing housing 220 and the second radial magnetic bearing housing 320 are respectively covered by the shielding layers 111, 211, and 311, thereby preventing the occurrence of eddy current loss, thereby improving the magnetic floating type liquid refrigerant pump. 10 about 5-10% operating efficiency. Moreover, the shielding layers 111, 211, and 311 can also reduce the detection precision of the electromagnetic pair sensor 330 generated by the motor stator 120, the first radial magnetic bearing housing 220, and the second radial magnetic bearing housing 320. influences.

In addition, in the present embodiment or other embodiments, the first radial magnetic bearing housing 220 and the second radial magnetic bearing housing 320 are a Heter-polar magnetic bearing housing. The structural design of the different-pole magnetic bearing housing allows the first radial magnetic bearing housing 220 and the second radial magnetic bearing housing 320 to have the advantages of easy installation and easy concentricity.

Please continue to refer to "FIG. 1" and at the same time with "3", which is a partial structural diagram of a magnetic floating type liquid refrigerant pump according to an embodiment of the present proposal. In this embodiment or other embodiments, the rotating module further includes two sleeves 191, 192. The sleeves 191 and 192 are respectively sleeved on the first end 1301 and the second end 1302 of the rotating shaft 130. Further, the first radial magnetic bearing housing rotor 151 and the sensing target 171 are disposed on the sleeve 191 (as shown in FIG. 3), and the second radial magnetic bearing rotor 152 and the sensing target 172 are disposed on On the sleeve 192. In addition, the rotating module further includes four buckles 181, 182, 183, 184, and the buckles 181, 183 are sleeved on the sleeve 191, and the buckle 181 is interposed between the sensing target 171 and the first radial magnetic bearing housing. Between the rotors 151, the sensing target 171 is interposed between the buckle 181 and the buckle 183 (as shown in "Fig. 3"). In addition, the buckles 182, 184 are sleeved on the sleeve 192, and the buckle 182 is interposed between the sensing target 172 and the second radial magnetic bearing rotor 152, and the sensing target 172 is interposed between the buckle 182 and the buckle Between 184. Wherein, the sleeves 191, 192 and the buckles 181, 182, 183, 184 can all be made of a non-permeability material, so that the first radial magnetic bearing rotor 151 and the second radial magnetic bearing can be insulated. The influence of the rotor 152 on the magnetic fields of the sensing targets 171, 172. Therefore, by designing the sleeves 191 and 192 and the buckles 181, 182, 183, and 184, the noise and sensitivity of the sensors 230 and 330 can be reduced to improve the operation accuracy and stability of the controlled magnetic floating liquid refrigerant pump 10. .

In addition, in the embodiment or other embodiments, the first bearing module 200 further includes a first auxiliary bearing 240 , and the first end 1301 of the rotating shaft 130 is disposed through the first auxiliary bearing 240 . The second bearing module 300 further includes a second auxiliary bearing 340 , and the second end 1302 of the rotating shaft 130 is disposed through the second auxiliary bearing 340 . The first auxiliary bearing 240 and the second auxiliary bearing 340 are contact bearings instead of magnetic floating bearings. The first auxiliary bearing 240 and the second auxiliary bearing 340 may be a ball bearing, but not limited thereto. When the magnetic floating liquid refrigerant pump 10 is suddenly powered off, the first radial magnetic bearing housing 220 and the second radial magnetic bearing housing 320 cannot provide the magnetic floating effect of the rotating shaft 130 due to power failure, the first auxiliary bearing 240 and The second auxiliary bearing 340 can instantly exert the effect of the general bearing to avoid the damage problem caused by the shaft 130 without the bearing support.

According to the magnetic floating type liquid refrigerant pump of the above embodiment, the magnetic floating structure is designed such that the rotating shaft does not directly contact the bearing module. This will eliminate the problem of friction loss to improve the life of the magnetic floating liquid refrigerant pump. In addition, due to the design of the magnetic floating structure, the working medium of the magnetic floating liquid refrigerant pump does not need to add additional lubricating oil, so that various refrigerants can be applied and the operating efficiency can be improved.

Moreover, by replacing or correcting the thickness of the axial spacing adjustment ring, the engineer can adjust the axial clearance between the thrust disk and the axial magnetic bearing to correct the axial error value generated by the magnetic floating liquid refrigerant pump during assembly. .

In addition, the design of the sleeve and the buckle of the non-magnetic material can reduce the noise and sensitivity of the sensor to improve the operation precision and stability of the magnetic floating liquid refrigerant pump.

Moreover, by the arrangement of the auxiliary bearing, one layer of the magnetic floating type liquid refrigerant pump can be provided to enhance the service life of the magnetic floating type liquid refrigerant pump.

While the present invention has been disclosed in the foregoing preferred embodiments, it is not intended to limit the present invention. Any skilled person skilled in the art can make some changes and refinements without departing from the spirit and scope of the present proposal. The scope of patent protection of the proposal shall be subject to the definition of the scope of the patent application attached to this specification.

10. . . Magnetic floating liquid refrigerant pump

100. . . Rotary module

110. . . case

111. . . Shield

120. . . Motor stator

130. . . Rotating shaft

1301. . . First end

1302. . . Second end

132. . . Lock firmware

134. . . Spacer ring

140. . . Motor rotor

151. . . First radial magnetic bearing rotor

152. . . Second radial magnetic bearing rotor

160. . . Thrust plate

171. . . Sensing target

172. . . Sensing target

181. . . Buckle

182. . . Buckle

183. . . Buckle

184. . . Buckle

191. . . Sleeve

192. . . Sleeve

200. . . First bearing module

210. . . First magnetic bearing shell

211. . . Shield

220. . . First radial magnetic bearing

221. . . First radial magnetic bearing

222. . . Coil

230. . . Sensor

240. . . First auxiliary bearing

300. . . Second bearing module

310. . . Second magnetic bearing shell

311. . . Shield

320. . . Second radial magnetic bearing

321. . . Second radial magnetic bearing

322. . . Coil

330. . . Sensor

340. . . Second auxiliary bearing

350. . . First axial magnetic bearing

360. . . Second axial magnetic bearing

370. . . End cap

380. . . Axial spacing adjustment ring

400. . . Pump module

410. . . Pump housing

420. . . Pump impeller

Fig. 1 is a cross-sectional view showing the structure of a magnetic floating type liquid refrigerant pump according to an embodiment of the present proposal.

Fig. 2 is a partial structural view showing a magnetic floating type liquid refrigerant pump according to an embodiment of the present proposal.

Fig. 3 is a partial structural view showing a magnetic floating type liquid refrigerant pump according to an embodiment of the present proposal.

10. . . Magnetic floating liquid refrigerant pump

100. . . Rotary module

110. . . case

111. . . Shield

120. . . Motor stator

130. . . Rotating shaft

1301. . . First end

1302. . . Second end

132. . . Lock firmware

134. . . Spacer ring

140. . . Motor rotor

151. . . First radial magnetic bearing rotor

152. . . Second radial magnetic bearing rotor

160. . . Thrust plate

171. . . Sensing target

172. . . Sensing target

181. . . Buckle

182. . . Buckle

183. . . Buckle

184. . . Buckle

191. . . Sleeve

192. . . Sleeve

200. . . First bearing module

210. . . First magnetic bearing shell

211. . . Shield

220. . . First radial magnetic bearing

221. . . First radial magnetic bearing

222. . . Coil

230. . . Sensor

240. . . First auxiliary bearing

300. . . Second bearing module

310. . . Second magnetic bearing shell

311. . . Shield

320. . . Second radial magnetic bearing

321. . . Second radial magnetic bearing

322. . . Coil

330. . . Sensor

340. . . Second auxiliary bearing

350. . . First axial magnetic bearing

360. . . Second axial magnetic bearing

370. . . End cap

380. . . Axial spacing adjustment ring

400. . . Pump module

410. . . Pump housing

420. . . Pump impeller

Claims (17)

A magnetic floating liquid refrigerant pump comprising: a rotating module comprising: a housing, the housing is provided with a motor stator; a rotating shaft pivoting the housing, the rotating shaft ring is provided with a motor rotor corresponding to the motor stator The rotating shaft has a first end and a second end; a first radial magnetic bearing rotor disposed at the first end; a second radial magnetic bearing rotor disposed at the second end; a thrust plate disposed at the second end; a first bearing module disposed on the rotating module, the first bearing module comprising a first radial magnetic bearing housing corresponding to the first radial magnetic bearing rotor; a second bearing module is disposed on the rotating module, the first bearing module and the second bearing module are located on opposite sides of the rotating module, and comprise: a second radial magnetic bearing housing, a second radial magnetic bearing rotor; a first axial magnetic bearing; a second axial magnetic bearing, maintaining a distance from the first axial magnetic bearing, the thrust disk being interposed between the first axial magnetic bearing Between the second axial maglev bearing; An axial spacing adjustment ring is interposed between the first axial magnetic bearing and the second axial magnetic bearing, such that the first axial magnetic bearing and the second axial magnetic bearing maintain the distance; The pump module is connected to the rotating shaft, and the rotating shaft drives the pump module to operate. The magnetic floating type liquid refrigerant pump according to claim 1, wherein the rotating module comprises a shielding layer covering the motor stator. The magnetic floating liquid refrigerant pump of claim 1, wherein the first bearing module further comprises a shielding layer covering the first radial magnetic bearing housing. The magnetic floating liquid refrigerant pump of claim 1, wherein the second bearing module further comprises a shielding layer covering the second radial magnetic bearing housing. The magnetic floating type liquid refrigerant pump of claim 1, wherein the first bearing module further comprises a sensor, the rotating module further comprising a sensing target disposed on the first end of the rotating shaft, The sensing target corresponds to the sensor to cause the sensor to detect the amount of displacement of the rotating shaft. The magnetic floating type liquid refrigerant pump of claim 5, wherein the rotating module further comprises a buckle ring disposed at the first end of the rotating shaft and interposed between the sensing target and the first radial direction The magnetic bearing between the rotors. The magnetic floating type liquid refrigerant pump of claim 6, wherein the rotating module further comprises a sleeve sleeved on the first end of the rotating shaft, wherein the first radial magnetic bearing rotor is located in the sleeve The sensing target and the buckle ring are disposed on the sleeve. The magnetic floating type liquid refrigerant pump of claim 1, wherein the first bearing module further comprises a first auxiliary bearing, the first end of the rotating shaft is disposed through the first auxiliary bearing. The magnetic floating liquid refrigerant pump of claim 1, wherein the first bearing module further comprises a first magnetic bearing housing disposed on one side of the housing, the first radial magnetic bearing housing being located Inside the first magnetic bearing housing. The magnetic floating type liquid refrigerant pump of claim 1, wherein the second bearing module further comprises a sensor, the rotating module further comprising a sensing target disposed on the second end of the rotating shaft, The sensing target corresponds to the sensor to cause the sensor to detect the amount of displacement of the rotating shaft. The magnetic floating type liquid refrigerant pump of claim 10, wherein the rotating module further comprises a buckle ring disposed at the second end of the rotating shaft and interposed between the sensing target and the second radial direction The magnetic bearing between the rotors. The magnetic floating type liquid refrigerant pump of claim 11, wherein the rotating module further comprises a sleeve sleeved on the second end of the rotating shaft, wherein the second radial magnetic bearing rotor is located in the sleeve The sensing target and the buckle ring are disposed on the sleeve. The magnetic floating liquid refrigerant pump of claim 1, wherein the second bearing module further comprises a second auxiliary bearing, the second end of the rotating shaft is disposed through the second auxiliary bearing. The magnetic floating type liquid refrigerant pump according to claim 1, wherein the second bearing module further comprises a second magnetic bearing housing disposed on one side of the housing, and the second magnetic bearing housing and the first a magnetic floating bearing housing is located on opposite sides of the housing, the second radial magnetic bearing housing and the first axial magnetic bearing are located in the second magnetic bearing housing, and the second axial magnetic bearing and the shaft The spacing adjustment ring is disposed in the detachable relationship in the second magnetic bearing housing. The magnetic floating type liquid refrigerant pump according to claim 14, wherein the second bearing module further comprises an end cover disposed in the detachable relationship on the second magnetic bearing housing, the end cover and the second magnetic bearing The outer casing encloses the second radial magnetic bearing housing, the first axial magnetic bearing, the second axial magnetic bearing and the axial spacing adjustment ring. The magnetic floating type liquid refrigerant pump according to claim 1, wherein the pump module further comprises a pump casing and a pump impeller, the pump casing is connected to the casing, and the pump impeller is connected to the shaft The first end of the shaft drives the pump impeller to rotate. The magnetic floating liquid refrigerant pump according to claim 1, wherein the first radial magnetic bearing housing or the second radial magnetic bearing housing is a different-pole magnetic bearing housing.