79 results about "Trapped air" patented technology

The invention discloses a dispensing process method suitable for dispensing medium-viscosity glue into a dense cavity to remove bubbles. The dispensing process method comprises the following steps that firstly, glue is pre-dispensed in a part; then the core body is loaded into a part, glue at the bottom is extruded, a gap between the core body and the part is filled with the glue from bottom to top, and air in the gap is exhausted; then top dispensing is conducted, top glue is self-leveled and connected with bottom glue at the edge, and the phenomenon that air trapping is formed due to the fact that the top glue is directly filled downwards along peripheral gaps and extrudes air, and air bubbles exist on the top glue face due to the fact that the glue viscosity is high and trapped air cannot be directly discharged is avoided; and standing the dispensed product for several minutes, enabling the product to enter a UV furnace for preliminary curing after the glue flow is leveled, and further curing at room temperature. The magnetic component product dispensed by the dispensing and curing process is good in air tightness, smooth in dispensing surface, free of pits and bubbles, free of cracks between glue and the surface of the product, good in bonding force and good in product appearance, and the phenomenon of air leakage caused by stripping of the glue and the surface of the product in a working environment is avoided.

The utility model provides a vacuumizing mechanism for an automobile silica gel lens injection mold, and belongs to the technical field of molds. The mold comprises a lower mold insert and a first color lens shell formed at the top end of the lower mold insert, a silica gel lens forming cavity is formed between the first color lens shell and the lower mold insert, and an exhaust hole is formed in the connecting position of the top end of the lower mold insert and the silica gel lens forming cavity. And a vacuumizing mechanism capable of exhausting air from the silica gel lens forming cavity through the exhaust hole is also arranged in the lower mold insert. After the first color lens shell is subjected to injection molding, silica gel liquid is injected into the silica gel lens forming cavity between the first color lens shell and the lower mold insert, so that the silica gel lens can be subjected to injection molding; and air in the silica gel lens forming cavity can be pumped out through the vacuumizing mechanism, so that air trapping at the bottom of the cavity during silica gel liquid injection molding is prevented, and the injection molding efficiency of a product can be effectively improved.

An apparatus can include a bonding head. The bonding head can include a bonding head body, a die chuck body, and lands. The bonding head body can be coupled to the die chuck. The lands can define zones. The lands and zones can be configured so that an outer zone can be under vacuum to hold a die while an inner zone is pressurized to cause the die to bow away from the bonding head. The bowed die has a relatively smoother curvature as compared to a die bent by bowing a die chuck that has pins, lands, or both. When the die contacts a substrate using the novel bonding head, the likelihood of trapping air and creating a void during a bonding operation is significantly reduced.

The invention relates to the field of die-casting dies, and discloses an automobile ultrathin lamp frame support die-casting die which comprises a fixed die frame, a movable die frame, a fixed die core, a movable die core, square iron and a movable die bottom plate. A left cavity and a right cavity of the mold cavity are respectively provided with a bottom transverse bulge, an outer curved bulge, a front vertical bulge, a longitudinal extension bulge, a rear vertical bulge, a cross curved bulge, a lower folding bulge and an upper folding bulge on the movable mold core, the mold sprue is arranged in the middle of the bottom of the movable mold core, and the sprue is communicated with the bottom transverse bulges of the left cavity and the right cavity through a sub-runner. The pouring gate is placed on the transverse side and the flat side of the product, so that the phenomenon of filling air trapping or molten aluminum rewinding in the pouring process of molten aluminum is reduced; molten aluminum flows in the sequence from the bottom transverse protrusion, the front vertical protrusion, the lower folding protrusion to the longitudinal extension protrusion, so that inflow water at the front vertical protrusion and the lower folding protrusion can be smoothly combined into one strand at the longitudinal extension protrusion and synchronously filled upwards, the filling smoothness is guaranteed, and the product forming quality is improved.

This air cushion portable information terminal case 100 is characterized by forming an air cushion part A sealed by covering a four peripheral frame part F of the portable information terminal case 100 with an outside four peripheral frame part FO and confining air inside.SOLUTION: An air cushion portable information terminal case (100) comprising a four peripheral frame portion (F), an outer four peripheral frame portion (FO), a transparent bottom plate (G), a portable information terminal case housing portion (S), and an air cushion portion (A), wherein the four peripheral frame portion (F) and the outer four peripheral frame portion (FO) are connected to each other, and the portable information terminal case housing portion (S) is surrounded by the four peripheral frame portion (F) and the transparent bottom plate (G).SELECTED DRAWING: Figure 4

Aspects of the present disclosure describe a vacuum luer lock connector comprising: a male luer configured to be coupled to a female luer defining a fluid passageway; a vacuum chamber between the male luer and the female luer, the vacuum chamber retaining air when the male luer is pushed into the female luer; a solid cylinder surrounding the male luer and serving as a piston, a cylindrical member surrounding the female luer and serving as a wall of the vacuum chamber; and a vent channel in the female luer, the vent channel allowing air to escape when the male luer is pushed into the female luer. The male luer and the female luer remain connected by a force created in a vacuum chamber surrounding the luers.

A self-insulated air gasper and a ventilation system including a series arrangement of air gaspers. In embodiments, each air gasper is manufactured to include a double wall configuration including inner and outer walls spaced apart to trap air or other insulative material. In embodiments, a series of air gaspers include a through passage and take-off duct for delivering air to an environment, for instance a passenger suite in an aircraft or other confined space. Each air gasper may further include a foraminous restrictor positioned at the terminal end of the duct outlet. In use, hose connections may be wrapped with insulative covering whereas the self-insulative feature of the air gaspers obviates the need for external insulative wrapping.

The utility model relates to the field of refrigeration equipment, and discloses an air conditioner panel, a mould for manufacturing the air conditioner panel and an air conditioner, the air conditioner panel comprises a panel main body and a display window, the panel main body is provided with a first plate body, a first transition area, a second plate body, a first transition area and a first plate body which are sequentially connected along the length direction of the panel main body, the display window is arranged at the second transition area, the thickness ratio of the first plate body to the second plate body to the display window is between 2.5: 1.6: 1 and 2.5: 2: 1, and the mold is provided with a first glue inlet nozzle, a second glue inlet nozzle and a third glue inlet nozzle. The air conditioner panel has the advantages that the air conditioner panel is formed in a multi-stage transition mode, the defects of insufficient filling, air trapping, weld lines, stress marks and the like in the forming process are overcome, the thickness ratio of the first plate body to the second plate body to the display window is within the specified range, the yield and reliability of the air conditioner panel are considered, and the air conditioner panel is suitable for being used in a large-scale production process. And the multiple glue inlet nozzles designed according to the forming requirements of the air conditioner panel can also improve the forming efficiency of the air conditioner panel.

The utility model discloses a thin-wall forming die. Comprising a panel, an upper mold, a lower mold, an ejector plate and a bottom plate, an upper mold core and a lower mold core are arranged on the upper mold and the lower mold respectively, an exhaust insert is arranged on a lower mold core insert, and the air trapping problem is solved. The ejection mechanism comprises an inclined ejection assembly and an ejector pin, and the inclined ejection assembly acts on a product rib position and is matched with the ejector pin to eject a product. The ejector plate is stable in structure, the bottom plate is provided with limiting and guiding components, the lower die is reasonably connected with the upper die, and die precision and stability are guaranteed. The panel and the bottom plate are provided with heat insulation plates, and the lower heat insulation plate is provided with related parts, so that the mold performance is improved, heat transfer is reduced, the service life of equipment is prolonged, production efficiency and product quality are improved, and large-batch production requirements of thin-wall products are met.

The invention relates to a method for producing a seal on a substrate, in particular on a layer of an electrochemical cell, by means of stencil printing, the method comprising the following steps: a) applying a sealant and / or adhesive (3) to a stencil (4) resting on the substrate to be printed; b) filling at least one recess (5) of the stencil (4) with the sealant and / or adhesive (3) using a doctor blade (6) which is drawn over the stencil (4) in a predetermined doctor blade direction for this purpose such that the doctor blade (6) presses the sealant and / or adhesive (3) into the at least one recess (5); and c) releasing the sealant and / or adhesive (3) from the stencil (4). According to the invention, the doctor blade process in step b) is recorded with the aid of at least one camera (7), and the recording is subjected to an image analysis in order to detect defects, in particular trapped air bubbles (8).

The utility model relates to a brushless motor iron core plastic coating mould which is provided with an upper mould body, a lower mould body and a middle mould body, a forming mould is arranged in the middle mould body, a cavity for placing a motor iron core to be coated with plastic is arranged in the forming mould, an injection molding runner is arranged between the upper mould body and the cavity of the forming mould, four plastic coating areas are uniformly distributed in the circumferential direction of the motor iron core, and the plastic coating areas are arranged in the middle mould body. Two spaced inserts are positioned and arranged in the cavity corresponding to each plastic coating area, the lower ends of the two inserts in each plastic coating area are embedded in the motor iron core, the upper ends of the two inserts are matched with the upper end of the cavity, and exhaust grooves are formed in the outer side surfaces of the inserts. According to the utility model, the inserts of which the outer side surfaces are provided with the exhaust grooves are positioned in the four plastic coating areas of the motor iron core, so that trapped air generated on the surface of the motor iron core can be timely exhausted through the exhaust grooves in the plastic coating process, the collapse phenomenon of the plastic coating areas caused by accumulation of the trapped air in the plastic coating areas can be effectively prevented, and the service life of the motor iron core is prolonged. And the plastic coating quality of the surface of the motor iron core is ensured.

A gas separation device for use in conjunction with a liquid chromatography system is presented. The gas separation device includes a housing defining a fluid flow path between an outer surface and an inner surface. The fluid flow path includes an inlet portion, a diffuser portion, a recombination portion, and an outlet portion. Any bubbles contained in the fluid are trapped within the diffuser portion as the fluid flows in the forward direction. Fluid flow through the gas separation device is reversible to remove trapped gas bubbles from within the gas separation device. In the operating state, fluid is delivered from the gas separation device into the waste stream to ensure that bubbles exit the liquid chromatography system. The gas separation device may exhibit an air capture efficiency ratio (ATER) of between 0.001 mL <-1 > and 0.51 mL <-1 > during the flow of the fluid in the forward direction.

The utility model provides a thickened warm-keeping type automobile seat fabric which comprises a blended base layer fabric, the fabric fluff is arranged on the blended base layer fabric, and the blended base layer fabric is located between a warm-keeping interlayer and a leather fabric layer. The blending base layer fabric, the back lining layer, the warm-keeping interlayer and the leather fabric layer are sewn together through the sewing threads; fluff leaking holes are formed in the warm-keeping interlayer and the leather fabric layer; the long fluff of the blended base layer fabric is matched with the warm-keeping interlayer, air is stored to form a heat insulation layer, heat loss is reduced, and the warm-keeping effect is good; villus leaking holes are formed in the warm-keeping interlayer and the leather fabric layer, so that long villus can penetrate out, air circulation is facilitated, and the air permeability is improved; the layers are tightly combined through a plurality of suture lines, the backing layer is thick, the structural stability and durability are enhanced, and comfortable experience is brought to drivers and passengers.

This utility model discloses an ink printing bubble removal mechanism, relating to the field of ink printing. The mechanism includes a third layer of ink printing stencil with R-shaped grooves at its four corners to collect and expel air. Air guide grooves are equidistantly spaced around the R-shaped grooves. A first ink layer is printed on the inner side of the outer glass, and a second layer is printed on top of the first layer. A height difference exists between the R-shaped grooves and the second ink layer to collect air. This mechanism extends the four right angles of the third ink printing stencil outwards to form R-shaped grooves. The height difference between the R-shaped grooves and the second ink layer provides space for collecting minute amounts of trapped air. When bonding OCA adhesive, trapped air can be expelled to the R-shaped grooves, effectively preventing the formation of air bubbles in the visible area and improving the product's appearance quality.

The utility model discloses a moisture-free deodorization device combining deodorant with an ultrasonic technology. The moisture-free deodorization device comprises a cabinet body, a rectangular window, a cover plate, universal wheels, a barreled inverted socket, a deodorant barrel, a delivery pipe, a blowing and discharging barrel, a case, a liquid storage chamber, a controller, an air blower, a liquid level electric control valve, an air guide pipe, an ultrasonic generator master controller, an ultrasonic plate and an air blowing pipe. The deodorization device is reasonable in structural design, deodorant liquid is atomized through the running ultrasonic plate, the function of atomizing deodorant mixed liquid into tiny water drop particles is achieved, the deodorant can be fully utilized, body feeling moisture is avoided, the deodorization device is completely compatible with air, the effective action time of air retention is long, and the deodorization effect is good through control of the controller and the ultrasonic generator master controller. The device has the function of automatically controlling deodorization, does not need to be guarded by personnel for a long time, is low in management and maintenance cost, and solves the problem that tap water is not communicated by filling a deodorant barrel with a deodorant mixed with water in proportion.

This utility model relates to the field of rewinding processing devices, and discloses a device suitable for rewinding roll materials, including a first winding device and a second winding device. The first and second winding devices are respectively disposed at both ends of the equipment base, and are used to receive and rewind the roll material respectively. A main feed roller is disposed in the middle position between the first and second winding devices, and is used to pull the roll material forward along the transmission path. A first correction probe and a second correction probe are located before and after the main feed roller, respectively disposed on the unloading side and the winding side, and are used to detect the edge position of the roll material and provide feedback correction signals. This utility model, through the active bonding function of the winding pressure roller, can effectively eliminate trapped air during the rewinding process, improve winding tightness and product yield, and is particularly suitable for processing materials such as tape, aluminum foil, and non-woven fabrics that require high roll density.

An apparatus can include a bonding head. The bonding head can include a bonding head body, a die chuck body, and lands. The bonding head body can be coupled to the die chuck. The lands can define zones. The lands and zones can be configured so that an outer zone can be under vacuum to hold a die while an inner zone is pressurized to cause the die to bow away from the bonding head. The bowed die has a relatively smoother curvature as compared to a die bent by bowing a die chuck that has pins, lands, or both. When the die contacts a substrate using the novel bonding head, the likelihood of trapping air and creating a void during a bonding operation is significantly reduced.

The invention relates to an automobile part injection mold trapped air multistage release device which comprises an upper mold, a lower mold, an upper mold cavity and a lower mold cavity, a cavity is formed between the upper mold cavity and the lower mold cavity, a first exhaust groove is formed in the upper mold, the first exhaust groove communicates with the cavity and the external environment, a vacuum buffer cavity is formed in the first exhaust groove, and the first exhaust groove is of a layered structure design. Comprising a main exhaust groove, branch exhaust grooves formed in the two sides of the main exhaust groove in a tree-shaped structure and micro exhaust grooves distributed in the circumferential sides of the branch exhaust grooves, a temperature control module is arranged in the main exhaust groove, and the bottom ends of the micro exhaust grooves penetrate through the upper die and extend to an upper die cavity to be communicated with the upper die cavity; a micropore module is embedded in the mold parting surface and communicates with the flow channel and the external environment. By adopting the synergistic effect of the multi-stage exhaust structure, compared with the traditional single-stage exhaust design, the exhaust efficiency can be greatly improved, and meanwhile, the melt retention risk is reduced.

A life jacket formed from a shell defining an interior air chamber in the shape of a conventional life jacket. The shell includes a neck opening configured to position a lower section of the shell against a front torso of a user and an upper section of the shell behind a head of the user. A reusable seal is coupled to the upper section of the shell and is operable to selectively open and close access to the interior air chamber. A fastening assembly secures the seal in a fixed closed position. An attachment strap is coupled to the lower section of the shell and is configured to wrap around the torso of the user to secure the shell in place. The life jacket is movable between a deflated condition. When deflated the shell may be folded or rolled into a compact configuration for storage. When inflated, the reusable seal traps air within the interior air chamber and the upper section of the shell is rolled at least two turns and secured by the fastening assembly to prevent unrolling and to compress the trapped air, thereby maintaining buoyancy of the life jacket.

This invention relates to the field of tunnel construction technology and discloses a prefabricated, assembled, reinforced waterproof material and its preparation method. The material includes a pre-installed adhesive tape, a non-woven fabric with a napped surface, a self-adhesive layer, and a layered composite waterproof board. The layered composite waterproof board is composed of upper and lower PE waterproof board layers and a middle EVA waterproof board layer. The separately prepared premixed materials are extruded into a three-layer co-extrusion die and cooled to obtain the layered composite waterproof board. A self-adhesive layer is coated on its surface to form a self-adhesive layer, which is then bonded to the un-nafted surface of the non-woven fabric. Finally, the napped surface of the non-woven fabric is physically pressed and bonded to the pre-installed adhesive tape. This invention improves interlayer bonding and prevents material delamination by employing a multi-layered composite structure and using a compatibilizer. The pre-installed adhesive tape and the napped surface of the non-woven fabric form a mechanical interlocking network, eliminating the need for hot-melt welding. The self-adhesive layer is distributed in strips to create venting channels, effectively removing trapped air and preventing delamination.

A system (50) for separating particles in a fluid has a first (52) and a second chamber (54) connected via a connector (56) with two ends, the first end (58) connecting to the first chamber (52) and the second end (60) connecting to the second chamber (54). The first chamber is higher than the second chamber and is connected pneumatically to an ambient atmosphere (66). The second chamber (54) is connected pneumatically or fluidically only to the first chamber via the connector only. A first method of operating the system includes adding a liquid to the first chamber to trap air in the connector and the second chamber; centrifuging the system at a first relative centrifugal force (RCF1) such that no part of the liquid enters the second chamber, and some air remains trapped in the connector; centrifuging the system at a second relative centrifugal force (RCF2) higher than RCF1, so at least a part of the liquid is transferred from the first chamber to the second chamber through the connector; and centrifuging the system at a relative centrifugal force (RCF3) lower than RCF2 so at least a part of the liquid is transferred from the second chamber to the first chamber through the connector. A second method of operating the system includes first adding a liquid containing particles to the first chamber to trap air in the connector and in the second chamber; then, centrifuging the system at a first relative centrifugal force (RCF1) so part of the air remains trapped in the connector and no particles are transported to the second chamber; then, centrifuging the system at a second relative centrifugal force (RCF2) higher than RCF1, so part of the liquid is transferred from the first chamber to the second chamber through the connector; and finally, centrifuging the system at a relative centrifugal force (RCF3) lower than RCF2 so part of the liquid is transferred from the second chamber to the first chamber through the connector.

The disclosure includes a method comprising determining that solar heat gain exists in trapped air between a window shade and a window and opening a controllable damper to exhaust the trapped air. The method may also include obtaining occupancy data about an occupant based on at least one of a home automation system or a security system. The method may also include forecasting, using a sky camera and historical sky conditions, sky conditions associated with a building; and determining, based on the forecasted sky conditions, a setting for at least one of a lighting system or an HVAC system associated with the building. The method may also include changing a timing of an automation routine for adjusting window shades to minimize an impact on peak demand energy usage.

A protective cover for vehicles during floods is disclosed A vehicle (102) is driven over the protective cover in any direction The protective cover is laid flat on a ground, pulled up and zipped along the sides. The rolling tube unrolls due to increasing internal pressure allowing the trapped air to escape. The rolling tube automatically rolls back once the pressure stabilizes. An inner tube (105) includes pores to expel air and a hydrophilic hydrogel to expand and seal the inner tube preventing backflow of water and air. An outer tube (110) to prevent water from entering the inner tube. A cork (115) forms a watertight seal, enhanced by a magnetic rim and spring to secure closure when triggered by a helium-filled float that rises with floodwaters. A trigger attached is adapted to rise with water thereby causing the trigger to be pulled out of its notch and releases the cork.

The present invention relates to a method for fabricating microneedles. The method comprises steps of dispensing liquid materials constituting microneedles into mold recesses under a first pressure (P1), increasing the pressure to a second pressure (P2) as the liquid material moves downward and dry, and repeating the process until the mold recesses are filled to a predetermined level. The invention also relates to an apparatus for fabricating microneedles which comprises a liquid dispenser, a mold, a mold holder, and a housing with pressure, temperature, and humidity control. In some embodiments, the liquid dispenser is equipped with fast-switching pressure-relieving poppet valves. The method and apparatus according to the present invention provide advantages as they can effectively eliminate trapped air bubbles with minimal material waste, resulting in microneedles with sharp tip and accurate dosing. They also enable customization of assorted multilayered microneedles patch, with a continuous workflow that is time- and cost-effective.

Method for manufacturing an insulating panel (10) with a device (20) comprising a pressing tool (21) with at least one counter-form (22) and at least one pressing part (23), wherein the counter-form (22) has at least one recess (24) for forming the insulating panel, and the method comprises the following steps: a) Arranging at least one first cover layer (12') in the recess (24) of the counter-mold (22) and arranging at least one second cover layer (12") on a pressing area (25) of the pressing part (23) facing the recess (24); b) Covering the first top layer (12') with at least one liquid plastic material, c) Inserting at least one core layer package consisting of an insulating core (27) with fiber layers arranged on both sides into the recess (24) of the counter-mold (22), such that at least the first of the two fiber layers is in contact with the liquid plastic material; d) Covering the second of the two fiber layers with the liquid plastic material, and e) Pressing the pressed part (23) with the pressing area (25) against the counter-form (22), wherein the core layer package is pressed together with the liquid plastic material and the two cover layers (12', 12") to form the insulating panel, and in which process f) at least one venting insert (26), which serves to remove the air trapped between the counter-mold (22) and the pressing part (23) during the pressing process, is arranged on an edge (28) of the counter-mold (22) adjacent to the recess (24), wherein the venting insert (26) is permeable to air and, in a closed state of the pressing tool (21), connects the recess (24) of the counter-mold (22) to the outside atmosphere, and wherein the venting insert (26) is designed to be liquid-tight, so that it allows trapped air to pass through and retains the liquid plastic material during the pressing process.

The utility model relates to the technical field of injection molds, and discloses an anastomat ultrasonic knife trigger injection mold which comprises a front mold plate and a rear mold plate, the front mold plate and the rear mold plate are provided with a front mold cavity and a rear mold cavity respectively, and the appearance of a forming cavity formed by combining the front mold cavity and the rear mold cavity is consistent with that of an anastomat ultrasonic knife trigger. The outline of the forming cavity comprises a handheld outline area and a thin-wall outline area, a plurality of exhaust grooves are formed in the front mold cavity at intervals along the outline of the handheld outline area, the exhaust grooves are communicated with an exhaust channel, and the number of the exhaust grooves in the thin-wall outline area is smaller than that of the exhaust grooves in the handheld outline area; the anastomat ultrasonic knife trigger injection mold solves the problem that an existing anastomat ultrasonic knife trigger forming mold is poor in product forming effect due to air trapping in the injection molding process.

The disclosure includes a method comprising determining that solar heat gain exists in trapped air between a window shade and a window and opening a controllable damper to exhaust the trapped air. The method may also include obtaining occupancy data about an occupant based on at least one of a home automation system or a security system. The method may also include forecasting, using a sky camera and historical sky conditions, sky conditions associated with a building; and determining, based on the forecasted sky conditions, a setting for at least one of a lighting system or an HVAC system associated with the building. The method may also include changing a timing of an automation routine for adjusting window shades to minimize an impact on peak demand energy usage.

This invention discloses an injection mold for automotive dashboard trim panels, belonging to the field of injection mold technology. The mold includes a fixed mold and a moving mold. The moving mold integrates a cold slug control device, a vacuum exhaust device, and an independent conformal cooling device. The cold slug control device uses side injection and a cold slug well at the gate position to trap the first cold slug entering the mold, eliminating silver streaks on the product surface. The vacuum exhaust device includes a vacuum generator installed on the outer side of the moving mold. Through exhaust holes and grooves on the first insert, it draws the mold cavity to a negative pressure of -0.06 to -0.09 MPa within 0.3 to 1.0 seconds after mold closing, allowing gas to be pre-expelled during rapid filling, preventing trapped air bulging and burning. The independent conformal cooling device provides parallel independent cooling water channels directly connected to the interior of the gate insert for each second insert, without bridging by other mold plates, achieving rapid and precise cooling of the gate area and solving the problem of gate whitening.

The invention provides a whole-cycle exhaust structure which is arranged on a mold core and comprises a first exhaust groove, the first exhaust groove surrounds the whole circumference of a cavity and communicates with one end of at least one second exhaust groove, and the other end of each second exhaust groove communicates with an air entraining groove; and the air entraining groove is used for guiding trapped air in the cavity to be discharged. The mold has the beneficial effects that trapped air generated in the mold cavity in the injection molding process can be guided into the air entraining groove from the mold cavity through the first air exhaust groove and the second air exhaust groove in sequence to be exhausted out of the mold cavity, the product is prevented from being subjected to reverse package air trapping and other defects, the mold is not limited by the air trapping position, the applicability is high, and the product yield is increased.

An electric pump for an electric vehicle power thermal management system comprises an electric motor and an axially driven impeller thereof to drive a pump liquid in a volute chamber, a cylindrical cavity surrounding a motor housing, a cylindrical heater built in the cavity to heat the pump liquid, and an inner peripheral partition and an outer peripheral partition respectively arranged around the inner and outer peripheries of the heater, the cavity is divided into an inner peripheral flow channel and an outer peripheral flow channel respectively bypassing the inner and outer peripheries of the cylindrical heater for the pump liquid to pass through, the two flow channels are only switched once at one end of the cavity, which not only avoids repeated switching of several sections of spiral flow channels in previous designs, rapid changes in flow direction, uneven flow distribution, local high temperature and trapped gas problems, but also the spiral rise angle of the partition in the uppermost section of the cavity is less than 20°, which reduces the curvature radius of the liquid flow motion trajectory and increases the centrifugal acceleration to exceed the gravity acceleration, so that the liquid flow can climb more smoothly over the highest position of the cavity and flush away the gas in the flow channel.