CN113007122A

CN113007122A - Centrifugal compressor of hydrogen circulating pump

Info

Publication number: CN113007122A
Application number: CN202110235976.7A
Authority: CN
Inventors: 祁明旭; 张璇; 徐子介
Original assignee: Beijing Berken Contemporary Hydrogen Fuel Cell Laboratory Co ltd; BEIJING LANTIANDA AUTOMOBILE CLEANING FUEL TECHNOLOGY CO LTD
Current assignee: Beijing Berken Contemporary Hydrogen Fuel Cell Laboratory Co ltd; BEIJING LANTIANDA AUTOMOBILE CLEANING FUEL TECHNOLOGY CO LTD
Priority date: 2021-03-03
Filing date: 2021-03-03
Publication date: 2021-06-22
Anticipated expiration: 2041-03-03
Also published as: CN113007122B

Abstract

A centrifugal compressor of a hydrogen circulating pump comprises a volute, an impeller and a adapter, wherein the impeller comprises blades, a blade bearing disc and a sealing disc, the blades are uniformly arranged at one end, facing an axial air inlet, of the blade bearing disc around the rotation axis of the impeller, and the sealing disc is coaxially arranged at the other end of the blade bearing disc; the circumference surface of sealed dish is equipped with sealed tooth, sealed tooth with adapter clearance fit forms the profile of tooth and seals. The device has compact integral structure, light weight, high reliability and low noise, and can meet the working condition requirements of high pressure ratio and large flow. On the basis of having compensatied the defect that other forms's hydrogen circulating pump exists, realize the non-contact pressure boost to when considering the pneumatic efficiency of pressure boost, design deicing heating device, solve the stifled commentaries on classics problem that the hydrogen circulating pump freezes and leads to, reduce the control degree of difficulty of hydrogen circulating pump, and improve hydrogen circulating pump's life.

Description

Centrifugal compressor of hydrogen circulating pump

The invention relates to the technical field of fuel cell power systems, in particular to a centrifugal compressor of a hydrogen circulating pump.

Background

The hydrogen and air (oxygen in the air) supply system is two key air supply systems of the hydrogen fuel cell, and the hydrogen in the vehicle-mounted high-pressure hydrogen storage bottle supplies hydrogen to the fuel cell through a pressure reducer and a flow control valve. In fact, the actual supply flow rate of hydrogen is 1.1 to 1.5 times higher than the theoretical consumption, so for better hydrogen management, a hydrogen recirculation system is generally used to recirculate the unreacted hydrogen from the anode off-gas to the hydrogen inlet of the fuel cell stack, so as to recycle the hydrogen.

Current ways of achieving hydrogen recirculation include ejectors and hydrogen circulation booster pumps. The ejector utilizes the pressure difference generated by high-speed jet working fluid to continuously suck the ejected gas and then accelerate the ejected gas, compared with a hydrogen circulation booster pump, the device has no moving part, simple structure, reliable operation and no parasitic power. However, to match the optimum fuel supply and fuel consumption rate, the gas inflow pressure control of the injectors is a major challenge, especially during load changes, when there is a risk of under-supply of fuel and anode over-or over-pressurization when the load changes greatly, which increases the complexity and difficulty of the control strategy in the fuel cell.

The hydrogen circulating booster pump is a common choice of hydrogen management technology in the existing fuel cell power system, and the hydrogen which is not reacted at the anode is pressurized and then is circulated to the fuel cell, so that the energy utilization rate is improved. The hydrogen circulation booster pump (i.e. hydrogen circulation pump) of the proton exchange membrane fuel cell can adopt the boosting forms at present, including centrifugal type, cam/roots type, claw type, diaphragm type, vortex type and the like.

The diaphragm booster pump and the vortex booster pump are only suitable for the working condition of small flow, cannot meet the requirement of large flow which is increased day by day, and have short service life. Therefore, the hydrogen circulating pump is a positive displacement circulating pump which is applied more at present and comprises a cam/Roots type circulating pump and a claw type circulating pump, and pressure difference is generated by meshing between a driving rotor and a driven rotor, so that the pressurization effect is realized, and then the hydrogen is pressurized and conveyed out. However, under the influence of the special working conditions of the hydrogen fuel cell power system, water is generated after the reaction of hydrogen and oxygen of the fuel cell stack is completed, namely unreacted hydrogen entering the recirculation system contains saturated humidity, in the recirculation system, water vapor is separated out due to the change of environment, pressure and the like, particularly under the low-temperature environment generated when the booster circulation pump works, the separated water vapor can be frozen, so that ice slag is formed on the surface of a rotor structure in contact with the hydrogen, and the rotor is blocked when the driving rotor and the driven rotor are rotationally meshed, so that the rotor is irreversibly damaged, which is also the most main reason for the damage of the existing claw type booster circulation pump and the cam/roots type booster circulation pump. In addition, the roots booster pump is limited by the structure, the energy efficiency is low, and the noise is inevitable and very large under the condition of large flow. The claw type booster pump adopts the principle of gap sealing under the oil-free condition, so that the sealing property is poor, and hydrogen leakage is easy to occur.

Disclosure of Invention

The centrifugal compressor of the hydrogen circulating pump provided by the invention has the advantages of compact overall structure, light weight, high reliability and low noise, meets the working condition requirements of high pressure ratio and large flow on the basis of realizing non-contact pressurization, solves the problem of locked rotor caused by icing of the hydrogen circulating pump, reduces the control difficulty of the hydrogen circulating pump, and prolongs the service life of the hydrogen circulating pump.

The technical scheme of the invention is as follows:

a centrifugal compressor of a hydrogen circulating pump comprises a volute and an adapter which are fixedly connected, and further comprises an impeller arranged in the volute and the adapter; the volute comprises an axial air inlet arranged at the center of the volute and a tangential exhaust pipe arranged in the circumferential direction of the volute, the impeller comprises blades, a blade bearing disc and a sealing disc, the blades are uniformly arranged at one end, facing the axial air inlet, of the blade bearing disc around the rotation axis of the impeller, and the sealing disc is coaxially arranged at the other end of the blade bearing disc; the circumference surface of sealed dish is equipped with sealed tooth, sealed tooth with adapter clearance fit forms the profile of tooth and seals.

Preferably, the blade is flat, the top of the blade is formed by smooth curved surface transition connection, and the matching surface of the interior of the volute and the contour line of the top of the impeller is formed by three sections of circular arcs which are connected in sequence in smooth transition; and a gap exists between the matching surface of the volute and the blade top contour line of the impeller; a deicing heating device is attached to the volute at least at an outer surface opposite to the mating surface.

Preferably, the adapter is close to the one end of spiral case is equipped with impeller holding hole and bearing frame holding hole in proper order, blade bears the dish and seals the dish and locates the impeller holding is downthehole, and pass through bearing and bearing frame in the bearing frame holding are downthehole float the suspension in the adapter, the bottom in impeller holding hole with there is the clearance between the free end of sealed dish.

Preferably, the inside of the volute, the inside of the adapter and the impeller are coated with a hydrogen corrosion prevention coating; the impeller rotates under the drive of the rotating shaft, a shaft hole is formed in the axis position of the impeller, and the rotating shaft is fixed and positioned in the shaft hole.

Preferably, the shaft hole comprises a threaded hole and a positioning unthreaded hole with an inner diameter larger than that of the threaded hole, the corresponding rotating shaft is provided with a threaded part and a positioning shaft shoulder, the rotating shaft is fixedly connected with the threaded part through the threaded hole, and positioning is realized through matching of the positioning unthreaded hole and the positioning shaft shoulder; the free end of the threaded part is screwed out of the threaded hole and is screwed, fixed and positioned on the impeller blade side through a fastening nut; the screwing direction of the fastening nut is opposite to the rotating direction of the impeller during working.

Preferably, the shaft hole comprises a first unthreaded hole arranged on the side of the blade bearing plate and a positioning unthreaded hole which is arranged on the side of the sealing plate and has an inner diameter larger than that of the first unthreaded hole, and the free end of the rotating shaft is provided with a threaded part and a positioning plate; the threaded part is screwed out of the shaft hole, and after the blade side is screwed and fastened with a double-nut structure, the positioning disc is just positioned in the positioning unthreaded hole; the positioning plate is fixed on the rotating shaft through at least two positioning pins which are arranged in a centrosymmetric manner.

Preferably, the bearing seat is fixed on the adapter seat, and the free end of the bearing seat is level with the bottom of the impeller accommodating hole; the bearing is an angular contact bearing, and a plurality of O-shaped rings are arranged between the bearing seat and the adapter seat along the axial direction of the bearing seat to absorb the pneumatic vibration of the impeller and the vibration caused by the unbalanced rotation of the rotating part and ensure the normal operation of the bearing.

Preferably, the deicing heating device comprises a heat tracing band, a heating ring or a patch type heating resistor, and the heating band, the heating ring or the patch type heating resistor can be attached to the outside of the volute or embedded in the wall of the volute; a water channel can be arranged in the wall of the volute, and the volute is heated by using circulating cooling water of a vehicle engine; the on-off of the deicing heating device is controlled through temperature data collected by a temperature sensor and received by a circulating pump controller.

Preferably, the seal teeth comprise triangular seal teeth or serrated seal teeth or trapezoidal seal teeth.

Preferably, the number of the seal teeth comprises 5-10, and/or the gap between the tooth top of the seal teeth and the adapter is 0.3-0.5 mm.

Compared with the prior art, the invention has the advantages that: the centrifugal compressor of the hydrogen circulating pump has the advantages of compact integral structure, light weight, high reliability and low noise, and can meet the working condition requirements of high pressure ratio and large flow. On the basis of having compensatied the defect that other forms's hydrogen circulating pump exists, realize the non-contact pressure boost to when considering the pneumatic efficiency of pressure boost, design deicing heating device, solve the stifled commentaries on classics problem that the hydrogen circulating pump freezes and leads to, reduce the control degree of difficulty of hydrogen circulating pump, and improve hydrogen circulating pump's life.

Drawings

FIG. 1 is a schematic cross-sectional view of a centrifugal compressor of the hydrogen circulation pump of the present invention;

FIG. 2 is a schematic view of the structure of an impeller of a centrifugal compressor of the hydrogen circulation pump of the present invention;

FIG. 3 is a schematic structural view of an impeller end face of a centrifugal compressor of the hydrogen circulation pump of the present invention;

FIG. 4 is a schematic structural view of a fixing and positioning manner between an impeller and a rotating shaft of a centrifugal compressor of the hydrogen circulation pump according to the present invention;

FIG. 5 is a partially enlarged schematic structural view of a fixed positioning manner between an impeller and a rotating shaft of a centrifugal compressor of the hydrogen circulation pump according to the present invention;

FIG. 6 is a schematic structural view of another fixing and positioning mode between an impeller and a rotating shaft of a centrifugal compressor of the hydrogen circulation pump of the present invention.

The reference numbers are listed below: 1-volute casing, 11-fitting surface, 12-axial air inlet, 13-tangential exhaust pipe, 2-impeller, 21-blade, 22-blade bearing disc, 23-sealing disc, 231-sealing tooth, 3-adapter, 31-impeller containing hole, 32-bearing seat containing hole, 4-deicing heating device, 5-bearing, 51-bearing retainer ring, 6-bearing seat, 61-fastening bolt, 7-rotating shaft, 71-thread part, 72-positioning shaft shoulder, 73-positioning disc, 74-positioning pin, 8-fastening nut and 9-sealing ring.

Detailed Description

To facilitate an understanding of the invention, the invention is described in more detail below with reference to figures 1-6 and the specific examples.

Example 1

A centrifugal compressor of a hydrogen circulating pump is shown in figure 1 and comprises a volute 1 and an adapter 3 which are fixedly connected, and further comprises an impeller 2 arranged in the volute 1 and the adapter 3; the volute 1 comprises an axial air inlet 12 arranged at the center of the volute and a tangential exhaust pipe 13 arranged at the periphery of the volute, and a sealing ring 9 (such as an O-shaped ring) is adopted between the volute 1 and the adapter 3 for sealing to prevent hydrogen leakage. The impeller 2 comprises blades 21, a blade bearing disc 22 and a sealing disc 23 as shown in fig. 2-3, wherein the blades 21 are uniformly arranged at one end of the blade bearing disc 22 facing the axial gas inlet 12 around the rotation axis of the impeller 2, and the sealing disc 23 is coaxially arranged at the other end of the blade bearing disc 22; blade 21, blade bear dish 22 and sealed dish 23 generally structure as an organic whole, sealed dish 23 circumferential surface is equipped with sealed tooth 231, sealed tooth 231 can be triangle-shaped sealed tooth or zigzag seal tooth or trapezoidal seal tooth, the number of teeth of sealed tooth 231 is generally 5-10, and the tooth pitch is preferred 1mm, and adapter 3 and the position of sealed tooth 231 complex are the unthreaded hole, and its with be clearance fit and form the profile of tooth and seal between the adapter 3, the tooth top of sealed tooth 231 with the clearance between the adapter is preferred 0.3mm-0.5mm to prevent that the hydrogen in the compressor duct from leaking to the rear end motor in.

Preferably, the blades 21 of the impeller 2 are flat-plate-shaped, and the axial height (axial direction of the rotating shaft) is smaller than the length of the radial extension according to the aerodynamic design requirement, as shown in fig. 3, when the blade bearing disc 22 extends from the center position along the radial direction, the surface of the side where the blades 21 are located is slowly lowered to form a pattern of high in the middle and low in the axial direction, and the axial height of the blades 21 is slightly raised as the blades 21 are closer to the center position. The centrifugal compressor of the hydrogen circulating pump has the advantages of compact overall structure, light weight, high reliability and low noise, and can meet the working condition requirements of high pressure ratio and large flow. In particular, the hydrogen circulation system can meet the use requirement of a hydrogen circulation system of a high-power fuel cell system with the power of more than 60 kW.

As a preferred scheme, the top of the top surface of the blade 21 is formed by smooth curved surface transition connection, and the contour shape of the matching surface 11 in the volute 1, which is matched with the impeller 2, is formed by three sections of circular arcs which are sequentially connected in a smooth transition way; and a clearance A is formed between the matching surface 11 of the volute 1 and the top contour line of the top surface of the blade 21 of the impeller 2; the volute 1 is affixed with de-icing heating means 4 at least at the outer surface opposite to the mating face 11. The deicing heating device 4 comprises a heat tracing band, a heating ring or a patch type heating resistor, and can be attached to the outside of the volute 1 or embedded in the wall of the volute 1; a water channel can be arranged in the wall of the volute 1, and the volute 1 is heated by circulating cooling water of a vehicle engine; the on-off of the deicing heating device 4 is controlled through temperature data collected by a temperature sensor received by a circulating pump controller, when the temperature data collected by the temperature sensor received by the circulating pump controller is lower than a certain temperature set value T (the temperature is the temperature for judging the occurrence of an ice blockage phenomenon), the circulating pump controller starts the deicing heating device 4 to heat the volute 1, the volute 1 is preferably made of a metal material with higher heat transfer efficiency, and because a gap A between the volute 1 and the impeller 2 is smaller and generally 0.5mm, when the heating is carried out for a certain time T, ice in the gap can be rapidly melted, so that the temperature of the position is increased, and then the circulating pump controller judges the situation of no blockage rotation, and stops heating. The centrifugal compressor of the hydrogen circulating pump realizes non-contact pressurization on the basis of making up the defects of other hydrogen circulating pumps, and designs the deicing heating device 4 while considering the pneumatic efficiency of the pressurization, thereby solving the problem of locked rotor caused by icing of the hydrogen circulating pump, reducing the control difficulty of the hydrogen circulating pump and prolonging the service life of the hydrogen circulating pump.

Preferably, adapter 3 is close to spiral case 1's one end is equipped with impeller accommodation hole 31 and bearing frame accommodation hole 32 in proper order, blade bears dish 22 and sealed dish 23 and locates in impeller accommodation hole 31, and through bearing 5 and bearing frame 6 in the bearing frame accommodation hole 32 float hang in adapter 3, the diameter that the blade bore dish 22 is greater than sealed dish 23's diameter, and the comprehensive consideration bearing 5's axial play and impeller 2's pneumatic influence, impeller accommodation hole 31's bottom with there is 0.5 mm's axial clearance between sealed dish 23's the free end (the one end of keeping away from the blade), so that impeller 2's location installation and stable high-efficient rotation.

Preferably, the inside of the volute 1, the inside of the adapter 3 and the impeller 2 are coated with a hydrogen corrosion-resistant coating; so as to prevent hydrogen gas from leaking out and simultaneously prevent the impeller 2 from being damaged by hydrogen embrittlement, hydrogen corrosion and the like under the condition of high-speed operation.

Preferably, the impeller 2 is driven by a rotating shaft 7 to rotate, an impeller shaft hole is formed in the axis position of the impeller 2, and the rotating shaft 7 is fixed and positioned in the impeller shaft hole. The fixing and positioning mode of the rotating shaft 7 in the impeller shaft hole is shown in fig. 4-5: impeller shaft hole sets up to the shoulder hole, is greater than including screw hole and internal diameter the location unthreaded hole of screw hole, correspond pivot 7 is for the shoulder shaft including location shoulder 72, and the short radius department of shoulder shaft is equipped with screw thread portion 71, and location shoulder 72 is used for locating unthreaded hole axial positioning at impeller 2, pivot 7 passes through the screw hole with screw thread portion 71 close soon and fixed connection, and pass through location unthreaded hole and location shoulder 72's cooperation realizes the location.

Preferably, the free end (left end in fig. 4-5) of the threaded portion 71 can be screwed out of the threaded hole and screwed, fixed and positioned by the fastening nut 8 at the blade 21 side of the impeller 2; the tightening direction of the fastening nut 8 is opposite to the rotation direction of the impeller 2 during operation. The impeller 2 may be provided with an outer hexagonal boss at a position where the fastening nut 8 is screwed on the side of the blade 21, so that the fastening nut 8 is screwed on the threaded portion 71, and the impeller 2 is mounted and screwed on the impeller rotating shaft 7.

Example 2

In contrast to the above-described exemplary embodiment, as shown in fig. 6, the impeller shaft bore can be designed as a stepped bore, with a first, short-radius bore being provided on the side of the blade carrier disk 22 and a positioning bore of a long radius being provided on the side of the sealing disk 23.

A free end (the left end in fig. 6) of the rotating shaft 7 is provided with a threaded part 71 and a positioning disc 73; the thread portion 71 is screwed out of the shaft hole 24, and after the blade 21 side is screwed and fastened with the fastening nut 8, the positioning disc 73 is positioned at the step of the positioning unthreaded hole. In this case, the fastening nut 8 may have a double nut structure, and the fastening nut 8 having the double nut structure is screwed to the screw portion 71 to press the impeller 2 against the positioning plate 73, thereby preventing the impeller 2 from rotating relatively to the shaft on the rotating shaft 7.

The positioning plate 73 is fixed to the rotating shaft 7 by at least two positioning pins 74 arranged in a central symmetry. Two symmetrical positioning spherical counter bores are arranged on the rotating shaft 7, and the positioning disc 73 cannot move relative to the rotating shaft 7 in the axial direction and the radial direction due to the action of the positioning pin 74. This structure is applicable to the condition that pivot 7 is thinner (pivot diameter is less promptly), because of the diameter is thinner, adopts the shaft shoulder to compress tightly fixed impeller 2, and its area of contact is less, can't fixed impeller 2. Therefore, the contact surface between the positioning disc 73 and the positioning unthreaded hole of the impeller 2 is enlarged by adopting the structure, and the positioning reliability is improved.

Preferably, the bearing seat 6 is fixed to the adapter 3, and a free end (an end close to the impeller 2) of the bearing seat 6 is flush with the bottom of the impeller accommodating hole 31; the bearing 5 is an angular contact bearing, and the inner ring of the bearing is in interference fit with the rotating shaft 7. The bearing seat 6 and the outer ring of the bearing 5 are assembled in a transition fit mode and are fixed on the adapter 3 through a fastening bolt 61. One end of the outer ring of the bearing 5 is fixed by a bearing retainer ring 51. The outer lane adopts high strength stereoplasm stainless steel material in the high-speed bearing 5, and the bearing room material hardness of bearing frame 6 is close with the 5 outer lane materials of bearing, can guarantee that bearing 5 rotates operation and life-span, and bearing frame 6 is fixed in on adapter 3 as the bearing room, and adapter 3 can adopt the less metal material of density, has both guaranteed bearing 5 outer lane cooperation hardness, alleviates product weight again. Bearing frame 6 with be equipped with a plurality of sealing washer 9 along its axial between the adapter 3, sealed for O type circle, can also absorb the vibration that impeller 2 pneumatic vibration and rotating part rotation unbalance led to on the basis of realizing sealed, guarantee bearing normal operating.

It should be noted that the above-described embodiments may enable those skilled in the art to more fully understand the present invention, but do not limit the present invention in any way. Therefore, although the present invention has been described in detail with reference to the drawings and examples, it will be understood by those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention.

Claims

1. A centrifugal compressor of a hydrogen circulating pump is characterized by comprising a volute and an adapter which are fixedly connected, and an impeller arranged in the volute and the adapter; the volute comprises an axial air inlet arranged at the center of the volute and a tangential exhaust pipe arranged in the circumferential direction of the volute, the impeller comprises blades, a blade bearing disc and a sealing disc, the blades are uniformly arranged at one end, facing the axial air inlet, of the blade bearing disc around the rotation axis of the impeller, and the sealing disc is coaxially arranged at the other end of the blade bearing disc; the circumference surface of sealed dish is equipped with sealed tooth, sealed tooth with adapter clearance fit forms the profile of tooth and seals.

2. The centrifugal compressor of a hydrogen circulation pump according to claim 1, wherein the seal teeth comprise triangular seal teeth or serrated seal teeth or trapezoidal seal teeth.

3. The centrifugal compressor of the hydrogen circulation pump according to claim 1 or 2, wherein the number of the seal teeth includes 5 to 10, and/or a clearance between a tooth crest portion of the seal teeth and the adapter is 0.3mm to 0.5 mm.

4. The centrifugal compressor of the hydrogen circulation pump according to claim 3, wherein the blades are flat, the tops of the blades are in smooth curved surface transition connection, and the matching surface of the inside of the volute, which is matched with the contour line of the top of the impeller blade, is formed by three sections of circular arcs in sequence in smooth transition connection; and a gap exists between the matching surface of the volute and the blade top contour line of the impeller; and the volute is provided with a deicing heating device at least at the outer surface opposite to the matching surface.

5. The centrifugal compressor of the hydrogen circulation pump according to claim 1 or 4, wherein an impeller accommodating hole and a bearing seat accommodating hole are sequentially formed in one end of the adapter close to the volute, the blade bearing plate and the sealing plate are arranged in the impeller accommodating hole and suspended on the adapter through a bearing and a bearing seat in the bearing seat accommodating hole, and a gap is formed between the bottom of the impeller accommodating hole and the free end of the sealing plate.

6. The centrifugal compressor of the hydrogen circulation pump according to claim 5, wherein the inside of the volute, the inside of the adapter and the impeller are coated with a hydrogen-corrosion-resistant coating; the impeller rotates under the drive of the rotating shaft, a shaft hole is formed in the axis position of the impeller, and the rotating shaft is fixed and positioned in the shaft hole.

7. The centrifugal compressor of the hydrogen circulation pump according to claim 6, wherein the shaft hole includes a threaded hole and a positioning hole with an inner diameter larger than that of the threaded hole, the corresponding rotating shaft is provided with a threaded portion and a positioning shoulder, and the rotating shaft is fixedly connected through the threaded hole and the threaded portion and is positioned through the matching of the positioning hole and the positioning shoulder.

8. The centrifugal compressor of the hydrogen circulation pump according to claim 7, wherein a free end of the threaded portion is screwed out of the threaded hole and is screwed and fixed and positioned by a fastening nut on the impeller blade side; the screwing direction of the fastening nut is opposite to the rotating direction of the impeller during working.

9. The centrifugal compressor of the hydrogen circulation pump according to claim 6, wherein the shaft hole includes a first unthreaded hole provided on the side of the blade bearing plate and a positioning unthreaded hole provided on the side of the sealing plate and having an inner diameter larger than that of the first unthreaded hole, and a threaded portion and a positioning plate are provided at a free end of the rotating shaft; the threaded part is screwed out of the shaft hole, and after the blade side is screwed and fastened with a double-nut structure, the positioning disc is just positioned in the positioning unthreaded hole; the positioning plate is fixed on the rotating shaft through at least two positioning pins which are arranged in a centrosymmetric manner; the screwing direction of the double-nut structure is opposite to the rotating direction of the impeller during working.

10. The centrifugal compressor of the hydrogen circulation pump according to claim 4, wherein the deicing heating device comprises a heat tracing band or a heating ring or a patch type heating resistor attached to the outside of the volute or embedded in the wall of the volute; and/or the deicing heating device comprises a circulating water channel arranged in the volute wall, and the circulating water channel is connected with circulating cooling water of a vehicle engine; the on-off of the deicing heating device is controlled through temperature data collected by a temperature sensor and received by a circulating pump controller.