Fluid heater and cleaning device

Abstract

This invention provides a fluid heater and a cleaning device, the cleaning device including the fluid heater. The fluid heater includes: a housing defining a fluid channel through which fluid flows and including a first pipe connector and a second pipe connector for connection to a fluid pipeline; a heating unit disposed within the fluid channel; and a heat-conducting unit disposed within the fluid channel adjacent to the heating unit to transfer heat generated by the heating unit to the fluid within the fluid channel. The above-described fluid heater has high heating efficiency.

Description

Technical Field

[0001] This invention relates generally to the field of surface cleaning technology, and more specifically to fluid heaters and cleaning apparatus including fluid heaters. Background Technology

[0002] With the continuous development of autonomous driving technology, self-driving cars have gradually become integrated into people's daily lives. Key components for self-driving cars to perceive the external environment typically include sensors such as LiDAR and cameras, and their stability and accuracy have a crucial impact on the safe operation of these vehicles. During operation, dust, mud, rain, snow, and other contaminants may adhere to the sensor surfaces, affecting their sensing performance and accuracy.

[0003] Currently, cleaning devices are typically placed near the sensors to remove deposits. One cleaning method available on the market is air purging technology. This technology uses a cleaning device to spray high-speed airflow onto the sensor's sensing surface, using the impact force of the airflow to blow the deposits off. However, when autonomous vehicles are used in cold weather, the sensor surface may frost up. Even with air purging, it is difficult to remove the frost, causing the sensor to malfunction or fail to start up properly. Summary of the Invention

[0004] The purpose of this invention is to solve the problems existing in the prior art and to provide an improved fluid heater and a cleaning device including the fluid heater.

[0005] To this end, a first aspect of the present invention provides a fluid heater comprising: a housing defining a fluid channel through which fluid flows and including a first connector and a second connector for connection to a fluid conduit; a heating unit disposed within the fluid channel; and a heat-conducting unit disposed within the fluid channel adjacent to the heating unit for transferring heat generated by the heating unit to the fluid within the fluid channel, wherein the heating unit includes a connecting portion configured to be detachably electrically connected to a conductor; or the heat-conducting unit is electrically connected to the heating unit and includes a connecting portion configured to be detachably electrically connected to a conductor.

[0006] The first aspect of the invention may further include any one or more of the following optional embodiments.

[0007] In some implementations, the heat-conducting unit defines multiple fluid passages through which fluid can pass.

[0008] In some embodiments, the heat-conducting unit includes at least one heat-conducting element, wherein the heat-conducting element includes a substrate and a plurality of fins connected to the substrate, wherein the substrate is attached to the surface of the heating unit, and wherein adjacent fins of the plurality of fins define the fluid passage.

[0009] In some embodiments, the at least one thermally conductive element includes a first thermally conductive element and a second thermally conductive element, wherein the heating unit is plate-shaped, and the substrates of the first thermally conductive element and the second thermally conductive element are respectively attached to opposite sides of the heating unit.

[0010] In some embodiments, the housing includes a recess therein, and the side edges of the substrates of the first thermally conductive element and the second thermally conductive element are adapted to be inserted into the recess; wherein the recess is configured to allow the substrates of the first thermally conductive element and the second thermally conductive element to slide therein to guide the thermally conductive unit to be installed into the housing, and / or restrict the thermally conductive unit from rotating relative to the housing.

[0011] In some embodiments, the substrate and the plurality of fins extend along the extension direction of the fluid channel, and / or the plurality of fins are substantially perpendicular to the substrate.

[0012] In some embodiments, the heat-conducting unit includes a first heat-conducting element and a second heat-conducting element, wherein the heating unit includes a first electrode and a second electrode, wherein the first heat-conducting element and the second heat-conducting element are made of metal and are electrically connected to the first electrode and the second electrode, respectively.

[0013] In some embodiments, the first thermally conductive element and the second thermally conductive element each include a connection portion configured to be electrically connected to a conductor providing a conductive path from the interior of the housing to the exterior of the housing.

[0014] In some embodiments, the heat-conducting unit includes a positioning portion, and the housing includes a mating portion disposed therein, wherein the positioning portion engages with the mating portion to restrict movement of the heat-conducting unit relative to the housing.

[0015] In some embodiments, the positioning part and the mating part are engaged by an interference fit.

[0016] In some embodiments, the heat-conducting unit is electrically connected to the heating unit and includes a channel, wherein the channel includes a connecting portion and a positioning portion located at opposite ends thereto, wherein the connecting portion is capable of receiving an externally threaded fastener for electrical connection with a conductor providing a conductive path from the inside of the housing to the outside of the housing, wherein the positioning portion engages with a mating portion disposed within the housing and in the form of a pin to restrict movement of the heat-conducting unit relative to the housing.

[0017] In some embodiments, at least one protrusion is provided on the inner side of the positioning portion and / or the outer side of the mating portion, and the positioning portion and the mating portion are engaged by means of the at least one protrusion in an interference fit manner.

[0018] In some embodiments, the housing includes a first housing portion and a second housing portion, wherein the first housing portion and the second housing portion are connected to each other to jointly define the fluid passage.

[0019] In some embodiments, the first housing portion has a tubular shape, and the second housing portion includes a tubular body, the first housing portion being adapted to be inserted into the tubular body to jointly define the fluid passage with the tubular body.

[0020] In some embodiments, the first housing portion includes an engagement protrusion, and the tubular body includes a receiving groove and an engagement groove communicating with each other, wherein the receiving groove is configured to allow the engagement protrusion to enter the receiving groove as the first housing portion is inserted into the tubular body, and wherein the engagement groove is configured to allow the engagement protrusion to enter the engagement groove from the receiving groove and engage with the engagement groove as the first housing portion rotates relative to the tubular body, thereby limiting relative movement between the first housing portion and the tubular body.

[0021] In some embodiments, the housing further includes a third housing portion, wherein the third housing portion is sleeved outside the first housing portion and non-rotatably connected to the second housing portion, wherein the third housing portion includes a first limiting portion and the first housing portion includes a second limiting portion, wherein the first limiting portion engages with the second limiting portion to prevent the first housing portion from rotating relative to the third housing portion and the second housing portion, thereby preventing the engaging protrusion from dislodging from the engaging groove.

[0022] In some embodiments, the second housing portion includes a plurality of snap-fit ​​protrusions, and the third housing portion correspondingly includes a plurality of snaps with snap-fit ​​holes, wherein the snap-fit ​​hole of each snap engages with a corresponding snap-fit ​​protrusion to connect the third housing portion to the second housing portion in a non-rotatable manner.

[0023] In some embodiments, one of the first limiting portion and the second limiting portion is in the form of a convex portion, and the other is in the form of a concave portion.

[0024] In some embodiments, the housing further includes a third housing portion sleeved over the first housing portion and connected to the second housing portion, wherein at least a portion of the first housing portion is held between the third housing portion and the second housing portion to restrict axial movement of the first housing portion relative to the second housing portion. In some embodiments, the first housing portion includes a locating rib disposed on its outer periphery, wherein the third housing portion is sleeve-shaped and includes an inwardly extending shoulder, wherein the locating rib is held between the shoulder and the end of the tubular body.

[0025] In some embodiments, the tubular body includes a boss disposed therein, wherein the end of the first housing portion and the boss are adapted to abut against opposite ends of the heat-conducting unit to restrict axial movement of the heat-conducting unit relative to the housing.

[0026] In some embodiments, the second housing portion further includes a cover portion surrounding the tubular body, wherein a cavity is formed between the tubular body and the cover portion.

[0027] In some embodiments, the first fitting includes an annular flange or an annular groove for connection to a fluid line, and / or the second fitting includes an annular flange or an annular groove for connection to a fluid line.

[0028] In some embodiments, the heating unit includes a PTC heating plate.

[0029] In some embodiments, the fluid heater further includes a power regulating module for adjusting the heating power of the fluid heater.

[0030] In some embodiments, the housing includes a retainer for holding a plug, the retainer including a first limiting protrusion adapted to abut against a second limiting protrusion of the plug to prevent the plug from disengaging from the retainer, wherein the retainer further includes a slot adjacent to the first limiting protrusion.

[0031] A second aspect of the invention provides a fluid heater comprising: a housing defining a fluid passage for fluid flow and including a first connector and a second connector for connection to a fluid conduit; the housing including a first housing portion having a tubular shape and a second housing portion including a tubular body, the first housing portion and the second housing portion being connected to each other, the first housing portion being inserted into the tubular body to jointly define the fluid passage; a heating unit disposed within the fluid passage; and a heat-conducting unit disposed within the fluid passage adjacent to the heating unit for transferring heat generated by the heating unit to the fluid within the fluid passage.

[0032] The second aspect of the invention may further include any one or more of the following optional embodiments.

[0033] In some implementations, the heat-conducting unit defines multiple fluid passages through which fluid can pass.

[0034] In some embodiments, the heat-conducting unit includes at least one heat-conducting element, wherein the heat-conducting element includes a substrate and a plurality of fins connected to the substrate, wherein the substrate is attached to the surface of the heating unit, and wherein adjacent fins of the plurality of fins define the fluid passage.

[0035] In some embodiments, the at least one thermally conductive element includes a first thermally conductive element and a second thermally conductive element, wherein the heating unit is plate-shaped, and the substrates of the first thermally conductive element and the second thermally conductive element are respectively attached to opposite sides of the heating unit.

[0036] In some embodiments, the housing includes a recess therein, and the side edges of the substrates of the first thermally conductive element and the second thermally conductive element are adapted to be inserted into the recess; wherein the recess is configured to allow the substrates of the first thermally conductive element and the second thermally conductive element to slide therein to guide the thermally conductive unit to be installed into the housing, and / or restrict the thermally conductive unit from rotating relative to the housing.

[0037] In some embodiments, the substrate and the plurality of fins extend along the extension direction of the fluid channel, and / or the plurality of fins are substantially perpendicular to the substrate.

[0038] In some embodiments, the heat-conducting unit includes a heat-conducting body and at least one heat-conducting chamber adjacent to the heat-conducting body, wherein the heat-conducting body defines the plurality of fluid passages, and wherein the heating unit includes at least one heating element, each heating element being held in a corresponding heat-conducting chamber.

[0039] In some embodiments, the heat-conducting body is columnar, and the at least one heat-conducting chamber is disposed on the outer periphery of the heat-conducting body.

[0040] In some embodiments, the heat-conducting body includes an outer peripheral wall, a mandrel, and a plurality of fins connecting the mandrel and the outer peripheral wall, wherein adjacent fins of the plurality of fins define the fluid passage.

[0041] In some embodiments, the heat-conducting body has a honeycomb cross-section.

[0042] In some embodiments, the heat-conducting unit includes a first heat-conducting element and a second heat-conducting element, wherein the heating unit includes a first electrode and a second electrode, wherein the first heat-conducting element and the second heat-conducting element are made of metal and are electrically connected to the first electrode and the second electrode, respectively.

[0043] In some embodiments, the first thermally conductive element and the second thermally conductive element each include a connection portion configured to be electrically connected to a conductor providing a conductive path from the interior of the housing to the exterior of the housing.

[0044] In some embodiments, the heat-conducting unit includes a positioning portion, and the housing includes a mating portion disposed therein, wherein the positioning portion engages with the mating portion to restrict movement of the heat-conducting unit relative to the housing.

[0045] In some embodiments, the positioning part and the mating part are engaged by an interference fit.

[0046] In some embodiments, the heat-conducting unit is electrically connected to the heating unit and includes a channel, wherein the channel includes a connecting portion and a positioning portion located at opposite ends thereto, wherein the connecting portion is capable of receiving an externally threaded fastener for electrical connection with a conductor providing a conductive path from the inside of the housing to the outside of the housing, wherein the positioning portion engages with a mating portion disposed within the housing and in the form of a pin to restrict movement of the heat-conducting unit relative to the housing.

[0047] In some embodiments, at least one protrusion is provided on the inner side of the positioning portion and / or the outer side of the mating portion, and the positioning portion and the mating portion are engaged by means of the at least one protrusion in an interference fit manner.

[0048] In some embodiments, the first housing portion includes an engagement protrusion, and the tubular body includes a receiving groove and an engagement groove communicating with each other, wherein the receiving groove is configured to allow the engagement protrusion to enter the receiving groove as the first housing portion is inserted into the tubular body, and wherein the engagement groove is configured to allow the engagement protrusion to enter the engagement groove from the receiving groove and engage with the engagement groove as the first housing portion rotates relative to the tubular body, thereby limiting relative movement between the first housing portion and the tubular body.

[0049] In some embodiments, the housing further includes a third housing portion, wherein the third housing portion is sleeved outside the first housing portion and non-rotatably connected to the second housing portion, wherein the third housing portion includes a first limiting portion and the first housing portion includes a second limiting portion, wherein the first limiting portion engages with the second limiting portion to prevent the first housing portion from rotating relative to the third housing portion and the second housing portion, thereby preventing the engaging protrusion from dislodging from the engaging groove.

[0050] In some embodiments, the second housing portion includes a plurality of snap-fit ​​protrusions, and the third housing portion correspondingly includes a plurality of snaps with snap-fit ​​holes, wherein the snap-fit ​​hole of each snap engages with a corresponding snap-fit ​​protrusion to connect the third housing portion to the second housing portion in a non-rotatable manner.

[0051] In some embodiments, one of the first limiting portion and the second limiting portion is in the form of a convex portion, and the other is in the form of a concave portion.

[0052] In some embodiments, the housing further includes a third housing portion sleeved over the first housing portion and connected to the second housing portion, wherein at least a portion of the first housing portion is held between the third housing portion and the second housing portion to restrict axial movement of the first housing portion relative to the second housing portion.

[0053] In some embodiments, the first housing portion includes a limiting rib disposed on its outer periphery, wherein the third housing portion is in the form of a sleeve and includes an inwardly extending shoulder, wherein the limiting rib is held between the shoulder and the end of the tubular body.

[0054] In some embodiments, the tubular body includes a boss disposed therein, wherein the end of the first housing portion and the boss are adapted to abut against opposite ends of the heat-conducting unit to restrict axial movement of the heat-conducting unit relative to the housing.

[0055] In some embodiments, the second housing portion further includes a cover portion surrounding the tubular body, wherein a cavity is formed between the tubular body and the cover portion.

[0056] In some embodiments, the first fitting includes an annular flange or an annular groove for connection to a fluid line, and / or the second fitting includes an annular flange or an annular groove for connection to a fluid line.

[0057] In some embodiments, the heating unit includes a PTC heating plate.

[0058] In some embodiments, the fluid heater further includes a power regulating module for adjusting the heating power of the fluid heater.

[0059] In some embodiments, the housing includes a retainer for holding a plug, the retainer including a first limiting protrusion adapted to abut against a second limiting protrusion of the plug to prevent the plug from disengaging from the retainer, wherein the retainer further includes a slot adjacent to the first limiting protrusion.

[0060] A third aspect of the invention provides a cleaning apparatus configured to spray a cleaning fluid onto a surface to be cleaned and includes at least one fluid heater according to the first and / or second aspects of the invention, the fluid heater being used to heat the cleaning fluid.

[0061] In some embodiments, the cleaning device includes a supply device, a fluid line, and a plurality of spray units, wherein the fluid line delivers cleaning fluid from the supply device to the plurality of spray units, and wherein a fluid heater is connected to the fluid line.

[0062] In some embodiments, the fluid conduit includes at least one branch node, and each of the at least one fluid heaters is located upstream of and adjacent to one of the branch nodes.

[0063] The fluid heater according to the present invention can be connected to a fluid pipeline through its first and second pipe joints to heat the fluid in the fluid pipeline. When the fluid heater is applied to a cleaning device, it can provide heated cleaning fluid to the surface to be cleaned, such as electronic devices (e.g., but not limited to sensors such as lidar and cameras), thereby accelerating the removal of frost from the surface of electronic devices in cold weather, enabling the electronic devices to start / operate normally. Furthermore, the heat-conducting unit of the aforementioned fluid heater, located within the fluid channel and adjacent to the heating unit, can directly contact the fluid, thereby improving heat exchange efficiency and thus increasing the heating efficiency of the fluid heater. Attached Figure Description

[0064] Other features and advantages of the invention will be better understood through the following detailed description of optional embodiments in conjunction with the accompanying drawings, in which the same reference numerals identify the same or similar parts, wherein: Figure 1 This is a schematic perspective view of a fluid heater according to a first embodiment of the present invention; Figure 2 This is a schematic cross-sectional view of a fluid heater according to a first embodiment of the present invention; Figure 3 This is a schematic exploded view of a fluid heater according to a first embodiment of the present invention; Figure 4 This is a schematic perspective view of the first housing portion of the housing of a fluid heater according to a first embodiment of the present invention; Figure 5A and Figure 5B These are schematic side views and cross-sectional views of the second housing portion of the housing of the fluid heater according to the first embodiment of the present invention; Figure 6 This is a schematic perspective view of the third housing portion of the housing of a fluid heater according to a first embodiment of the present invention; Figure 7A This is a schematic side view of the heating unit and heat conduction unit of a fluid heater according to a first embodiment of the present invention; Figure 7B yes Figure 7A A schematic exploded view of the heating unit and the heat conduction unit in the diagram; Figure 8 This is a schematic perspective view of a fluid heater according to a first embodiment of the present invention, wherein the first housing portion and the third housing portion of the fluid heater are omitted; Figure 9A This is a schematic perspective view of a fluid heater according to a first embodiment of the present invention, wherein the engaging protrusion of the first housing portion enters the receiving groove of the second housing portion, and the third housing portion of the fluid heater housing is omitted. Figure 9B yes Figure 9A A magnified view of a portion of the image; Figure 10A This is a schematic perspective view of a fluid heater according to a first embodiment of the present invention, wherein the engagement protrusion of the first housing portion engages with the engagement groove of the second housing portion, and the third housing portion of the fluid heater housing is omitted. Figure 10B yes Figure 10A A magnified view of a portion of the image; Figure 11This is a schematic perspective view of the first housing portion and the third housing portion of a fluid heater according to a first embodiment of the present invention; Figure 12 This is a schematic perspective view of the heating unit and the heat-conducting unit of a fluid heater according to a second embodiment of the present invention; Figure 13 yes Figure 12 A schematic 3D view of the heat-conducting unit in the image; Figure 14A yes Figure 12 A schematic top view of the heating unit in the diagram; Figure 14B and Figure 14C yes Figure 12 A schematic top view and side view of the heat-conducting unit in the figure, wherein the insulating film of the heating unit is omitted; Figure 15 This is a schematic side view of the heat-conducting unit of a fluid heater according to a third embodiment of the present invention; Figure 16 This is a schematic side view of the heat-conducting unit of a fluid heater according to a fourth embodiment of the present invention; and Figure 17 This is a schematic diagram of a cleaning device according to a fifth embodiment of the present invention; Figure 18 This is a schematic perspective view of a fluid heater according to a sixth embodiment of the present invention; Figure 19 This is a schematic side view of a fluid heater according to a sixth embodiment of the present invention; Figure 20A This is a schematic cross-sectional view of a fluid heater according to a sixth embodiment of the present invention; Figure 20B yes Figure 20A A magnified view of region A in the image; Figure 20C yes Figure 20A A magnified view of region A in the image, where the heat-conducting elements of the fluid heater are omitted; Figure 21A This is a perspective view of the second housing portion of a fluid heater according to a sixth embodiment of the present invention; Figure 21B yes Figure 21A A magnified view of region B in the image; and Figure 21C This is a partial cross-sectional view of the holder of the fluid heater according to the sixth embodiment of the present invention. Detailed Implementation

[0065] The implementation and use of the embodiments are discussed in detail below. However, it should be understood that the specific embodiments discussed are merely illustrative of particular ways of implementing and using the invention, and are not intended to limit the scope of the invention. The descriptions of the structural positions of the various components, such as upper, lower, top, bottom, etc., are not absolute but relative. These orientations are appropriate when the various components are arranged as shown in the figures, but they change accordingly when the positions of the components in the figures change.

[0066] In this invention, the axial direction of a tubular or columnar component refers to the direction of the central axis of the component, the circumferential direction of a tubular or columnar component refers to the direction along the circumference of the component, and the radial direction of a tubular or columnar component refers to the direction that passes through the central axis of the component and is perpendicular to the axial direction of the component.

[0067] The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In this invention, unless otherwise expressly specified, the terms "installed," "connected," "linked," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0068] Figures 1 to 11 A fluid heater 10 and its components according to a first embodiment of the present invention are shown.

[0069] Reference Figures 1 to 3 The fluid heater 10 includes a housing 100, a heating unit 200, and a heat-conducting unit 300. The housing 100 defines a fluid passage 102 through which fluid flows and includes a first connector 104 and a second connector 106 for connection to a fluid conduit. The heating unit 200 is disposed within the fluid passage 102. The heat-conducting unit 300 is disposed within the fluid passage 102 adjacent to the heating unit 200 to transfer heat generated by the heating unit 200 to the fluid within the fluid passage 102.

[0070] The fluid heater 10 described above can be connected to a fluid pipeline via its first pipe connector 104 and second pipe connector 106 to heat the fluid in the pipeline. When the fluid heater 10 is used in a cleaning device, it can provide heated cleaning fluid to electronic devices to be cleaned (such as, but not limited to, sensors like lidar and cameras), thereby accelerating the removal of frost from the surface of electronic devices in cold weather, enabling the electronic devices to start / operate normally. In addition, the heat-conducting unit 300 of the fluid heater 10, which is located in the fluid channel 102 and adjacent to the heating unit 200, can directly contact the fluid, thereby improving heat exchange efficiency and thus improving the heating efficiency of the fluid heater 10 on the fluid.

[0071] Continue to refer to Figures 1 to 6 The housing 100 includes a first housing portion 108 and a second housing portion 110, wherein the first housing portion 108 and the second housing portion 110 are connected to each other to jointly define a fluid passage 102. In the illustrated embodiment, the first housing portion 108 has a tubular shape, and the second housing portion 110 includes a tubular body 112 having a tubular shape, the first housing portion 108 and the tubular body 112 jointly defining the fluid passage 102.

[0072] In the illustrated embodiment, the first housing portion 108 may sequentially include a first mating section 114, a first contraction section 116, and a first pipe connector 104 along its axial direction. The tubular body 112 of the second housing portion 110 may sequentially include a second mating section 118, a second contraction section 120, and a second pipe connector 106 along its axial direction. The first mating section 114 and the second mating section 118 are connected to each other. The first pipe connector 104 may include an annular flange 105 having a generally triangular cross-section for direct connection to, for example, a hose. The second pipe connector 106 may include an annular flange 107 having a generally triangular cross-section for direct connection to, for example, a hose. The first pipe connector 104 and the second pipe connector 106 may be connected to different fluid lines, for example, to a first fluid line and a second fluid line, respectively, or the first pipe connector 104 and the second pipe connector 106 may be connected to different portions of a fluid line, respectively. It is conceivable that in other embodiments, the first and second pipe fittings may also have other structures for connecting to fluid lines, such as annular flanges or annular grooves with generally rectangular or square cross-sections, for connecting to fluid lines by means of quick connectors.

[0073] The heating unit 200 and the heat-conducting unit 300 may be disposed within the tubular body 112 of the second housing portion 110. The second housing portion 110 may also include a cover 122 surrounding the tubular body 112. A cavity is formed between the tubular body 112 and the cover 122 to provide heat insulation and thermal insulation effects. In the illustrated embodiment, the second housing portion 110 may also include a base 124 on which both the tubular body 112 and the cover 122 are disposed. The base 124 may include a mounting portion 126 for securing the fluid heater 10 to a support structure. In the illustrated embodiment, the mounting portion 126 is in the form of a through hole to receive fasteners (e.g., but not limited to bolts, pins, studs, etc.). It is conceivable that in other embodiments not shown, the mounting portion may have other structures, such as being in the form of claws for snap-fit ​​fixation to the support structure.

[0074] Optionally, the first housing portion 108 can be integrally formed from plastic, particularly high-temperature resistant plastic, by injection molding. Optionally, the second housing portion 110 can be integrally formed from plastic, particularly high-temperature resistant plastic, by injection molding.

[0075] Reference Figures 2 to 4 as well as Figures 9A to 11 The first housing portion 108 can be inserted into the tubular body 112. The first housing portion 108 includes an engaging protrusion 128. The tubular body 112 includes a receiving groove 130 and an engaging groove 132 communicating with each other. The receiving groove 130 is configured to allow the engaging protrusion 128 to enter the receiving groove 130 as the first housing portion 108 is inserted into the tubular body 112. The engaging groove 132 is configured to allow the engaging protrusion 128 to enter the engaging groove 132 from the receiving groove 130 and engage with the engaging groove 132 as the first housing portion 108 rotates relative to the tubular body 112, thereby limiting relative movement between the first housing portion 108 and the tubular body 112.

[0076] In the illustrated embodiment, the engaging protrusion 128 is disposed on the outer periphery of the first housing portion 108 and is generally L-shaped. A receiving groove 130 extends axially from one end of the tubular body 112, and an engaging groove 132 is disposed at the side edge of the receiving groove 130. When assembling the first housing portion 108 and the tubular body 112, the first housing portion 108 can be first inserted axially into the tubular body 112, such that the engaging protrusion 128 enters the receiving groove 130, as shown. Figure 9A and Figure 9B As shown; when the free end of the engaging protrusion 128 is aligned with the engaging groove 132, the first housing portion 108 can be rotated relative to the tubular body 112, causing the engaging protrusion 128 to enter the engaging groove 132 and engage with it, as shown. Figure 10A and Figure 10BAs shown, this at least restricts axial movement of the first housing portion 108 relative to the tubular body 112. Optionally, the engaging protrusion 128 may be configured to interference fit with the engaging groove 132 to prevent rotation of the first housing portion 108 relative to the tubular body 112. In the illustrated embodiment, the first housing portion 108 includes three engaging protrusions 128, and correspondingly, the tubular body 112 of the second housing portion 110 includes three receiving grooves 130 and three engaging grooves 132. It is contemplated that in other embodiments not shown, other suitable numbers of engaging protrusions, receiving grooves, and engaging grooves may be provided. It is also contemplated that in other embodiments not shown, the engaging protrusions may not have an L-shape, but rather have other suitable shapes such as square or rectangular shapes.

[0077] In the illustrated embodiment, the housing 100 may further include a third housing portion 134, which is fitted over the first housing portion 108 and non-rotatably connected to the cover 122 of the second housing portion 110. In the illustrated embodiment, the third housing portion 134 is fitted over the outer side of the connection area between the tubular body 112 of the first housing portion 108 and the second housing portion 110, and a cavity is formed between the third housing portion 134, the first housing portion 108, and the tubular body 112 to provide thermal insulation. Optionally, the third housing portion 134 may be integrally formed from plastic, particularly high-temperature resistant plastic, through injection molding.

[0078] In the illustrated embodiment, the third housing portion 134 includes a first limiting portion 136, and the first housing portion 108 includes a second limiting portion 138. The first limiting portion 136 engages with the second limiting portion 138 to prevent the first housing portion 108 from rotating relative to the third housing portion 134, thereby preventing the first housing portion 108 from rotating relative to the tubular body 112 of the second housing portion 110, and further preventing the engaging protrusion 128 from disengaging from the engaging groove 132. In the illustrated embodiment, the first limiting portion 136 is disposed inside the third housing portion 134 and is in the form of a protrusion, while the second limiting portion 138 is disposed on the outer periphery of the first housing portion 108 and is in the form of a recess. The third housing portion 134 includes two first limiting portions 136, and the first housing portion 108 includes two second limiting portions 138. It is conceivable that in other embodiments not shown, the first limiting portion may be in the form of a recess, and the second limiting portion may be in the form of a protrusion. It is also conceivable that in some other embodiments, not shown, other suitable numbers of first and second limiting parts may be provided.

[0079] In the illustrated embodiment, at least a portion of the first housing portion 108 may be held between the third housing portion 134 and the tubular body 112 to restrict axial movement of the first housing portion 108 relative to the tubular body 112. The first housing portion 108 includes at least one limiting rib 140 disposed on its outer periphery. The third housing portion 134 is in the form of a sleeve and includes an inwardly extending shoulder 142. The limiting rib 140 is held between the shoulder 142 and the end of the tubular body 112. In the illustrated embodiment, at least one limiting rib 140 extends in the circumferential direction of the first housing portion 108 and includes a first limiting rib 140A and a second limiting rib 140B. The first limiting rib 140A and the second limiting rib 140B define two second limiting portions 138 therebetween. In the illustrated embodiment, the limiting rib 140 can also limit the insertion depth of the first housing portion 108 when it is inserted into the tubular body 112 of the second housing portion 110, so that when the limiting rib 140 abuts the end of the tubular body 112, the free end of the engaging protrusion 128 of the first housing portion 108 can be aligned with the engaging groove 132 of the tubular body 112, so as to facilitate the assembly of the first housing portion 108 and the second housing portion 110 as described above.

[0080] Reference Figure 3 as well as Figures 5A to 6 In the illustrated embodiment, the cover 122 of the second housing portion 110 has a plurality of snap-fit ​​protrusions 148 on its outer periphery. Correspondingly, the third housing portion 134 has a plurality of snap fasteners 150, each snap fastener 150 having a snap-fit ​​hole 152 to engage with a corresponding snap-fit ​​protrusion 148, so as to connect the third housing portion 134 to the cover 122 of the second housing portion 110 in a non-rotatable manner. In the illustrated embodiment, the cover 122 of the second housing portion 110 includes three snap-fit ​​protrusions 148, and the third housing portion 134 includes three snap fasteners 150. It is conceivable that in other embodiments not shown, the cover of the second housing portion may include other suitable numbers of snap-fit ​​protrusions, and the third housing portion may be provided with other suitable numbers of snap fasteners. It is also conceivable that the second housing portion and the third housing portion may be connected by other connection structures, such as providing snap fasteners on the second housing portion and snap-fit ​​protrusions on the third housing portion.

[0081] Reference Figure 2 , Figure 3 as well as Figure 7A and Figure 7BThe heating unit 200 is plate-shaped and includes a first electrode 202A and a second electrode 202B located on opposite sides thereon, and a plurality of PTC (positive temperature coefficient) heating plates 206 sandwiched between the first electrode 202A and the second electrode 202B. In the illustrated embodiment, the first electrode 202A and the second electrode 202B are aluminum sheets. Both side surfaces of each PTC heating plate 206 are coated with a conductive paste layer. The first electrode 202A and the second electrode 202B can be fixed to the side surfaces of the PTC heating plate 206 by, for example, a high-temperature resistant conductive adhesive. It is conceivable that in other embodiments not shown, the heating unit may not use PTC heating plates, but instead includes other types of heating elements such as resistance heating elements, infrared heating elements, and induction heating elements.

[0082] The heat-conducting unit 300 defines multiple fluid passages 316 for fluid to pass through, thereby increasing the contact area between the fluid and the heat-conducting unit 300 and increasing the heat exchange efficiency between the heat-conducting unit 300 and the fluid. The heat-conducting unit 300 may include at least one heat-conducting element 302 and may be fixed to the heating unit 200 to form a columnar heating structure together with the heating unit 200. This columnar heating structure may extend along the extension direction of the fluid passage 102 (i.e., the axial direction of the housing 100). Each heat-conducting element 302 is made of metal. In the illustrated embodiment, at least one heat-conducting element 302 includes a first heat-conducting element 302A and a second heat-conducting element 302B, which have the same construction. It is conceivable that in other embodiments not shown, the multiple heat-conducting elements of the heat-conducting unit may have different structures; the heat-conducting unit may include other suitable numbers of heat-conducting elements.

[0083] In the illustrated embodiment, each heat-conducting element 302 includes a substrate 304 and a plurality of fins 306 connected to the substrate 304. The substrate 304 of each heat-conducting element 302 is attached to a corresponding surface (i.e., a corresponding electrode) of the heating unit 200. Thus, the heat-conducting element 302 can achieve a large contact area with the heating unit 200 through the substrate 304, and a large contact area with the fluid within the fluid heater 10 through the plurality of fins 306, thereby providing high heat exchange efficiency. In the illustrated embodiment, the substrate 304 and the plurality of fins 306 of the heat-conducting element 302 extend along the extension direction of the fluid channel 102 (i.e., the axial direction of the housing 100). The plurality of fins 306 may be parallel to each other and substantially perpendicular to the substrate 304. A fluid passage 316 is defined between two adjacent fins of the plurality of fins 306.

[0084] In the illustrated embodiment, the heating unit 200 is disposed between the substrate 304A of the first thermally conductive element 302A and the substrate 304B of the second thermally conductive element 302B. The substrates 304A and 304B of the first and second thermally conductive elements 302A are respectively bonded together and electrically connected to the first electrode 202A and the second electrode 202B. The substrates 304A and 304B of the first and second thermally conductive elements 302A can be bonded together and electrically connected to the first and second electrodes 202A, for example, using a high-temperature resistant conductive adhesive. The first and second thermally conductive elements 302A and 302B can be further electrically connected to an external power source to power the heating unit 200, as will be described in detail below.

[0085] The aluminum sheet serving as the first electrode 202A and the second electrode 202B in the heating unit 200 improves the electrical connection between the PTC heating plate 206 and the heat-conducting unit 300. In a heating unit without an aluminum sheet, if the surface flatness of the substrate is poor, one or more PTC heating plates may not adhere well to the substrate and fail to connect electrically, resulting in one or more PTC heating plates not being energized and unable to operate. In contrast, for a heating unit with an aluminum sheet, because the aluminum sheet is thinner than the substrate, it can better adhere to the side surfaces of multiple PTC heating plates, and the large-area adhesion between the aluminum sheet and the substrate of the heat-conducting element ensures a good electrical connection between the aluminum sheet and the heat-conducting element. Therefore, the aluminum sheet can provide a good current path from the heat-conducting element to the PTC heating plate.

[0086] It is conceivable that, in some other embodiments not shown, where the substrate and the PTC heating plate have good surface flatness, the heating unit may also include only a number of PTC heating plates without aluminum sheets. In this case, the conductive paste layer on the two side surfaces of the PTC heating plate forms the first and second electrodes of the heating unit.

[0087] Continue to refer to Figures 1 to 3 , Figure 5A , Figure 5B as well as Figure 7A and Figure 7B Each heat-conducting element 302 of the heat-conducting unit 300 may further include a connecting portion 308. The connecting portion 308 is configured to be detachably electrically connected to the conductor 400, thereby allowing current to be transferred to the heating unit 200 through the conductor 400 and the heat-conducting unit 300. The conductor 400 can be electrically connected to an external power source to power the heating unit 200, and therefore the conductor 400 may also be referred to as a power transmission conductor. In the illustrated embodiment, the conductor 400 extends from the inside of the housing 100 to the outside of the housing 100 to provide a conductive path from the inside of the housing 100 to the outside of the housing 100.

[0088] It is conceivable that, in some other embodiments not shown, the outer periphery of the housing may be fitted with a plug for electrical connection to an external power source, and a conductor may be disposed inside the housing and electrically connected to the plug. It is also conceivable that, in some other embodiments not shown, when the heat-conducting unit is not electrically connected to the heating unit, a connection portion may be provided on the heating unit, which is detachably electrically connected to the conductor, thereby transmitting current to the heating unit through the conductor.

[0089] By providing a connecting part 308 on the heating unit 200 or the heat conduction unit 300 to be detachably electrically connected to the conductor 400, the maintenance of the fluid heater 10 can be facilitated, and in particular, the replacement of, for example, the conductor 400 can be made easier.

[0090] In the illustrated embodiment, conductor 400 may be a wire having electrical terminals 402 and wires 404. In other embodiments not shown, conductor 400 may have other suitable configurations. In the illustrated embodiment, each heat-conducting element 302 may further include a positioning portion 310, and the second housing portion 110 of housing 100 includes a mating portion 156 disposed therein, wherein the positioning portion 310 engages with the mating portion 156 to restrict movement of the heat-conducting unit 300 relative to housing 100. In the illustrated embodiment, each heat-conducting element 302 may include a channel 312 connected to substrate 304. Opposite ends of channel 312 are formed as connecting portions 308 and positioning portions 310.

[0091] In the illustrated embodiment, the connecting portion 308 is capable of receiving an externally threaded fastener 500 for electrical connection to the electrical terminals 402 of the conductor 400 via a threaded connection. The externally threaded fastener 500 may be made of metal, such as a self-tapping screw made of metal. The electrical terminals 402 of the conductor 400 may extend through a receiving groove 130 of the second housing portion 110 to the outside of the tubular body 112 of the second housing portion 110 (wherein, sealant may be applied around the electrical terminals 402 of the conductor 400 to prevent fluid leakage within the fluid passage 102), and the wires 404 of the conductor 400 may further extend through an opening 135 on the third housing portion 134 to the outside of the housing 100 for electrical connection to a plug 600 disposed on the outer periphery of the cover portion 122 of the second housing portion 110.

[0092] The plug 600 can be further electrically connected to an external power source to power the heating unit 200. The cover 122 of the second housing portion 110 may be provided with a protrusion 137 having a recess 139. When the second housing portion 110 and the third housing portion 134 are connected to each other, the protrusion 137 on the second housing portion 110 inserts into the opening 135 of the third housing portion 134, and the recess 139 on the second housing portion 110 matches the outer contour of the wire 404 to retain and limit the wire 404.

[0093] In the illustrated embodiment, the positioning portion 310 engages with a pin-shaped fitting portion 156 disposed within the housing 100 to restrict movement of the heat-conducting unit 300 relative to the housing 100. In the illustrated embodiment, the second constricted section 120 of the tubular body 112 of the second housing portion 110 is provided with two bosses 154 and two pins 156 protruding from each boss 154. Each pin 156 is adapted to engage with the positioning portion 310 of a corresponding heat-conducting element 302 to restrict rotation of the heat-conducting unit 300 relative to the housing 100, thereby restricting rotation of the heating structure formed by the heat-conducting unit 300 and the heating unit 200 relative to the housing 100. It is conceivable that in other embodiments not shown, other suitable numbers of bosses and pins may be provided.

[0094] Furthermore, the boss 154 of the second housing portion 110 and the end of the first housing portion 108 are adapted to abut against opposite ends of the heat-conducting unit 300 to restrict the axial movement of the heat-conducting unit 300 relative to the housing 100, thereby restricting the axial movement of the heating structure formed by the heat-conducting unit 300 and the heating unit 200 relative to the housing 100.

[0095] In the illustrated embodiment, the second mating section 118 of the tubular body 112 of the second housing portion 110 includes a groove 158 disposed therein, and the side edges of the substrate 304A of the first thermally conductive element 302A and the side edges of the substrate 304B of the second thermally conductive element 302B are adapted to be inserted into the groove 158. During the assembly of the fluid heater 10, the substrate 304A of the first thermally conductive element 302A and the substrate 304B of the second thermally conductive element 302B can be inserted into the groove 158 and slide along the groove 158 to guide the thermally conductive unit 300 to be installed into the housing 100, thereby guiding the heating structure formed by the thermally conductive unit 300 and the heating unit 200 to be installed into the housing 100. After the fluid heater 10 is assembled, the side edges of the substrate 304A of the first heat-conducting element 302A and the side edges of the substrate 304B of the second heat-conducting element 302B are inserted into the grooves 158 to restrict the rotation of the heat-conducting unit 300 relative to the housing 100, thereby restricting the rotation of the heating structure formed by the heat-conducting unit 300 and the heating unit 200 relative to the housing 100. In the illustrated embodiment, the tubular body 112 of the second housing portion 110 includes two oppositely disposed grooves 158.

[0096] The fluid heater 10 may also include a power regulation module (not shown) for regulating the heating power of the fluid heater 10. The power regulation module may include, for example, a pulse width modulation (PWM) controller, a voltage regulator, a current regulator, or other electronic devices that enable power regulation.

[0097] Figures 12 to 14CA heating unit and a heat-conducting unit of a fluid heater according to a second embodiment of the present invention are shown. The fluid heater according to the second embodiment may have a housing that is substantially the same as or different from that of the fluid heater according to the first embodiment. The heating unit and the heat-conducting unit of the fluid heater according to the second embodiment will be described below in detail.

[0098] Reference Figures 12 to 14C According to the second embodiment, the heating unit 200 of the fluid heater is fixed / held in the heat-conducting unit 300 to form a columnar heating structure with the heat-conducting unit 300.

[0099] The heat-conducting unit 300 may include a heat-conducting body 314 and at least one heat-conducting chamber 315 adjacent to the heat-conducting body 314. The heat-conducting body 314 defines a plurality of fluid passages 316 through which fluid passes. The plurality of fluid passages 316 may be parallel to each other. In the illustrated embodiment, the heat-conducting body 314 is cylindrical and includes an outer peripheral wall 318, a mandrel 320, and a plurality of fins 306 connecting the mandrel 320 and the outer peripheral wall 318. Each fin 306 is in the form of a flat plate and extends along the axial direction of the mandrel 320. A fluid passage 316 is formed between two adjacent fins of the plurality of fins 306. At least one heat-conducting chamber 315 is disposed at the outer periphery of the heat-conducting body 314. In the illustrated embodiment, each heat-conducting chamber 315 may include an end wall 322 and two side walls 324, the end wall 322 being connected to the outer peripheral wall 318 of the heat-conducting body 314 via the two side walls 324. Alternatively, the heat-conducting unit 300 may be made of metal and formed by an extrusion process.

[0100] The heating unit 200 includes at least one heating element 208, each heating element 208 being held within a corresponding heat-conducting chamber 315. In the illustrated embodiment, each heating element 208 includes two electrodes 202, a plurality of PTC heating plates 206 sandwiched between the two electrodes 202, two wires 210 extending from the two electrodes 202 by crimping, and an insulating film 212 wrapped around the two electrodes 202 and the plurality of PTC heating plates 206. Each heating element 208 can be held within the corresponding heat-conducting chamber 315 by crimping. During assembly, the heating element 208 can be placed within the corresponding heat-conducting chamber 315, and then the two sidewalls 324 and / or endwalls 322 of the heat-conducting chamber 315 are pressed toward the interior of the heat-conducting chamber 315, reducing the internal space of the heat-conducting chamber 315 to fix / hold the heating element 208 within the heat-conducting chamber 315.

[0101] In the illustrated embodiment, the heat-conducting unit 300 includes two heat-conducting chambers 315, and the heating unit 200 includes two heating elements 208. It is conceivable that in other embodiments not shown, the heat-conducting unit may also include other suitable numbers of heat-conducting chambers, and correspondingly, the heating unit may include other suitable numbers of heating elements.

[0102] Figure 15 A heat-conducting unit of a fluid heater according to a third embodiment of the present invention is shown. The heat-conducting unit according to the third embodiment is similar to that according to the second embodiment, except that the fins 306 of the heat-conducting unit 300 according to the third embodiment are in the form of a curved plate.

[0103] Figure 16 A heat-conducting unit of a fluid heater according to a fourth embodiment of the present invention is shown. The heat-conducting unit according to the fourth embodiment is similar to that according to the third embodiment, except that the heat-conducting body 314 of the heat-conducting unit 300 according to the fourth embodiment is in the shape of a square column, and the heat-conducting body 314 defines a plurality of parallel fluid passages 316 and has a honeycomb cross-section.

[0104] Figure 17 A cleaning apparatus according to a fifth embodiment of the present invention is shown. The cleaning apparatus 1 is configured to spray a cleaning fluid onto a surface to be cleaned. Optionally, the cleaning fluid is a gas, such as air. The surface to be cleaned is, for example, the sensing surface of a sensor such as a lidar sensor or a camera.

[0105] Reference Figure 17 The cleaning device 1 may include a supply device 20, a fluid line 30, a plurality of spray units 40, and one or more fluid heaters 10 according to the invention. The fluid line 30 delivers cleaning fluid from the supply device 20 to the plurality of spray units 40. The fluid heaters 10 are connected to the fluid line 30 to heat the cleaning fluid.

[0106] The fluid conduit 30 may include one or more branch nodes 31. Each fluid heater 10 may be located upstream of and adjacent to one of the branch nodes 31. By placing the fluid heater 10 upstream of the branch node 31, heated clean fluid can be supplied to multiple pipes located downstream of the branch node 31 simultaneously, reducing the number of fluid heaters 10 required, lowering costs, and reducing heat loss of the heated clean fluid during transport in the pipes due to the proximity of the fluid heater 10 to the branch node 31.

[0107] In the illustrated embodiment, the fluid conduit 30 may include a first conduit 32, two second conduits 33, and four third conduits 34. A first branch node 31A is formed between the first conduit 32 and the two second conduits 33, and a second branch node 31B is formed between each second conduit 33 and the corresponding two third conduits 34. In the illustrated embodiment, the cleaning device 1 includes two fluid heaters 10. Each fluid heater 10 is connected to a corresponding second conduit 33 and is located upstream of the second branch node 31B to provide heated cleaning fluid to the third conduit 34 located downstream of the second branch node 31B.

[0108] It is conceivable that, in some other embodiments not shown, only one fluid heater may be provided upstream of the first diversion node; in some other embodiments not shown, fluid heaters may be provided upstream of both the first diversion node and the two second diversion nodes, i.e., a total of three fluid heaters may be provided; in some other embodiments not shown, one fluid heater may also be provided near each injection unit.

[0109] The above fluid piping is merely an example; fluid piping can have any suitable pipe hierarchy structure and any suitable number of pipes; correspondingly, the number and location of fluid heaters can also be reasonably set according to the structure of the fluid piping.

[0110] Figures 18 to 21C A fluid heater according to a sixth embodiment of the present invention is shown. The fluid heater according to the sixth embodiment is similar to the fluid heater according to the first embodiment; only the differences between the two will be described below.

[0111] Reference Figure 18 According to the sixth embodiment, the base 124 of the second housing portion 110 of the fluid heater 10 includes a mounting portion 126A and a mounting portion 126B. The mounting portion 126A is in the form of an oblong through hole, and the mounting portion 126B is in the form of a circular through hole, so as to facilitate the adjustment of the mounting position of the fluid heater. An oblong metal bushing 127A and a circular metal bushing 127B are also respectively provided in the mounting portion 126A and the mounting portion 126B to prevent creep deformation caused by long-term pressure of fasteners on the plastic second housing portion 110, thereby ensuring connection reliability.

[0112] Reference Figure 19 A first limiting shoulder 109 and a second limiting shoulder 111 may be respectively provided on the first pipe joint 104 of the first housing portion 108 and the second pipe joint 106 of the second housing portion 110 of the fluid heater 10. The first limiting shoulder 109 can limit the end of the first fluid pipeline connected to the first pipe joint 104. The second limiting shoulder 111 can limit the end of the second fluid pipeline connected to the second pipe joint 106.

[0113] Reference Figures 20A to 20C Each pin-shaped mating portion 156 of the second housing portion 110 of the fluid heater 10 can be engaged with the positioning portion 310 of the corresponding heat-conducting element 302 in an interference fit manner. In the illustrated embodiment, at least one protrusion 157 is provided on the outer side / outer periphery of each mating portion 156. Each mating portion 156 can be interference-fitted with the corresponding positioning portion 310 by means of at least one protrusion 157. The protrusion 157 can be semi-cylindrical, spiked, dotted, etc. It is conceivable that in some other embodiments not shown, a protrusion may also be provided on the inner side / inner periphery of the positioning portion 310 to achieve an interference fit.

[0114] Reference Figures 21A to 21C The second housing portion 110 of the fluid heater 10 is provided with a retaining seat 160 for holding the plug 600. The retaining seat 160 includes a groove 162 and a first limiting protrusion 166. The sliding portion of the plug 600 can slide along the groove 162 to mount the plug 600 to the retaining seat 160. When the sliding portion of the plug 600 slides into place in the groove 162, the first limiting protrusion 166 can abut against the second limiting protrusion 602 of the plug 600 to prevent the sliding portion of the plug 600 from sliding out of the groove 162. The retainer 160 includes a slot 168 adjacent to the first limiting protrusion 166 to enhance the elasticity of the portion of the retainer 160 including the first limiting protrusion 166, such that: during the sliding portion of the plug 600 sliding into the groove 162, the portion of the retainer 160 including the first limiting protrusion 166 can deform to allow the second limiting protrusion 602 of the plug 600 to move smoothly over the first limiting protrusion 166 of the retainer 160, thereby allowing the sliding portion of the plug 600 to slide into place in the groove 162 (in other words, the plug 600 can be mounted in place on the retainer 160). In the illustrated embodiment, the retainer 160 includes two slots 168 provided on opposite sides of the first limiting protrusion 166.

[0115] It should also be understood that the various components and features described herein may be made of a variety of materials, including but not limited to polymers, rubber, metals, and other suitable materials or combinations thereof known to those skilled in the art. Figures 1 to 17 The embodiments shown only illustrate the shape, number, size, and arrangement of various optional components of the fluid heater and cleaning device according to the invention; however, they are merely illustrative and not limiting. Other shapes, sizes, and arrangements may be adopted without departing from the spirit and scope of the invention.

[0116] The technical content and features of the present invention have been disclosed above. However, it is understood that, under the inventive concept of the present invention, those skilled in the art can easily make modifications, variations, and equivalents of these embodiments based on the disclosed content. For example, features shown or described as part of one embodiment can be used with another embodiment to produce yet another embodiment. This disclosure is intended to cover these modifications, variations, and equivalents. The description of the above embodiments is exemplary and not restrictive, and the scope of protection of the present invention is determined by the claims.

Claims

1. A fluid heater, characterized by, The fluid heater (10) includes: The housing (100) defines a fluid passage (102) through which fluid flows and includes a first fitting (104) and a second fitting (106) for connection to a fluid line. Heating unit (200), said heating unit (200) being disposed within said fluid channel (102); and A heat-conducting unit (300) is disposed within the fluid channel (102) adjacent to the heating unit (200) to transfer the heat generated by the heating unit (200) to the fluid within the fluid channel (102). The heating unit (200) includes a connecting portion (308) configured to be detachably electrically connected to the conductor (400); or the heat-conducting unit (300) is electrically connected to the heating unit (200) and includes a connecting portion (308) configured to be detachably electrically connected to the conductor (400).

2. A fluid heater characterized by, The fluid heater (10) includes: A housing (100) defines a fluid passage (102) through which fluid flows and includes a first fitting (104) and a second fitting (106) for connection to a fluid line. The housing (100) includes a first housing portion (108) having a tubular shape and a second housing portion (110) including a tubular body (112). The first housing portion (108) and the second housing portion (110) are connected to each other. The first housing portion (108) is inserted into the tubular body (112) to define the fluid passage (102) together with the tubular body (112). Heating unit (200), said heating unit (200) being disposed within said fluid channel (102); and A heat-conducting unit (300) is disposed in the fluid channel (102) adjacent to the heating unit (200) to transfer the heat generated by the heating unit (200) to the fluid in the fluid channel (102).

3. A fluid heater as claimed in claim 1 or 2, characterised in that, The heat-conducting unit (300) defines a plurality of fluid passages (316) through which fluid can pass.

4. The fluid heater of claim 3, wherein, The heat-conducting unit (300) includes at least one heat-conducting element (302), wherein the heat-conducting element (302) includes a substrate (304) and a plurality of fins (306) connected to the substrate (304), wherein the substrate (304) is attached to the surface of the heating unit (200), and wherein the fluid passage (316) is defined between adjacent fins of the plurality of fins (306).

5. The fluid heater according to claim 4, characterized in that, The at least one thermally conductive element (302) includes a first thermally conductive element (302A) and a second thermally conductive element (302B), wherein the heating unit (200) is plate-shaped, wherein the substrate (304A) of the first thermally conductive element (302A) and the substrate (304B) of the second thermally conductive element (302B) are respectively attached to opposite sides of the heating unit (200).

6. The fluid heater according to claim 5, characterized in that, The housing (100) includes a recess (158) disposed therein, and the side edges of the substrate (304A) of the first thermally conductive element (302A) and the substrate (304B) of the second thermally conductive element (302B) are adapted to be inserted into the recess (158); wherein the recess (158) is configured to allow the substrate (304A) of the first thermally conductive element (302A) and the substrate (304B) of the second thermally conductive element (302B) to slide therein to guide the thermally conductive unit (300) to be installed into the housing (100), and / or restrict the thermally conductive unit (300) from rotating relative to the housing (100).

7. The fluid heater according to claim 4, characterized in that, The substrate (304) and the plurality of fins (306) extend along the extension direction of the fluid channel (102), and / or the plurality of fins (306) are substantially perpendicular to the substrate (304).

8. The fluid heater according to claim 2, characterized in that, The heat-conducting unit (300) includes a heat-conducting body (314) and at least one heat-conducting chamber (315) adjacent to the heat-conducting body (314), wherein the heat-conducting body (314) defines a plurality of fluid passages (316), wherein the heating unit (200) includes at least one heating element (208), each heating element (208) being held within a corresponding heat-conducting chamber (315).

9. The fluid heater according to claim 8, characterized in that, The heat-conducting body (314) is columnar, and at least one heat-conducting chamber (315) is disposed on the outer periphery of the heat-conducting body (314).

10. The fluid heater according to claim 9, characterized in that, The heat-conducting body (314) includes an outer peripheral wall (318), a mandrel (320), and a plurality of fins (306) connecting the mandrel (320) and the outer peripheral wall (318), wherein the fluid passage (316) is defined between adjacent fins of the plurality of fins (306).

11. The fluid heater according to claim 9, characterized in that, The heat-conducting body (314) has a honeycomb cross-section.

12. The fluid heater according to claim 1 or 2, characterized in that, The heat-conducting unit (300) includes a first heat-conducting element (302A) and a second heat-conducting element (302B), wherein the heating unit (200) includes a first electrode (202A) and a second electrode (202B), wherein the first heat-conducting element (302A) and the second heat-conducting element (302B) are made of metal and are electrically connected to the first electrode (202A) and the second electrode (202B) respectively.

13. The fluid heater according to claim 12, characterized in that, The first thermal conductive element (302A) and the second thermal conductive element (302B) each include a connection portion (308) configured to be electrically connected to a conductor (400) that provides a conductive path from the inside of the housing (100) to the outside of the housing (100).

14. The fluid heater according to claim 1 or 2, characterized in that, The heat-conducting unit (300) includes a positioning part (310), and the housing (100) includes a mating part (156) disposed therein, wherein the positioning part (310) engages with the mating part (156) to restrict the movement of the heat-conducting unit (300) relative to the housing (100).

15. The fluid heater according to claim 14, characterized in that, The positioning part (310) and the mating part (156) are engaged by an interference fit.

16. The fluid heater according to claim 1 or 2, characterized in that, The heat-conducting unit (300) is electrically connected to the heating unit (200) and includes a channel (312), wherein the channel (312) includes a connecting portion (308) and a positioning portion (310) located at opposite ends thereto, wherein the connecting portion (308) is capable of receiving an externally threaded fastener (500) for electrical connection with a conductor (400) providing a conductive path from the inside of the housing (100) to the outside of the housing (100), wherein the positioning portion (310) engages with a fitting portion (156) disposed within the housing (100) and in the form of a pin to restrict movement of the heat-conducting unit (300) relative to the housing (100).

17. The fluid heater according to claim 16, characterized in that, At least one protrusion (157) is provided on the inner side of the positioning part (310) and / or the outer side of the mating part (156), and the positioning part (310) and the mating part (156) are engaged by means of the at least one protrusion (157) in an interference fit manner.

18. The fluid heater according to claim 1, characterized in that, The housing (100) includes a first housing portion (108) and a second housing portion (110), wherein the first housing portion (108) and the second housing portion (110) are connected to each other to jointly define the fluid passage (102).

19. The fluid heater according to claim 18, characterized in that, The first housing portion (108) has a tubular shape, and the second housing portion (110) includes a tubular body (112). The first housing portion (108) is adapted to be inserted into the tubular body (112) to define the fluid passage (102) together with the tubular body (112).

20. The fluid heater according to claim 2 or 19, characterized in that, The first housing portion (108) includes an engagement protrusion (128), and the tubular body (112) includes a receiving groove (130) and an engagement groove (132) communicating with each other, wherein the receiving groove (130) is configured to allow the engagement protrusion (128) to enter the receiving groove (130) as the first housing portion (108) is inserted into the tubular body (112), and wherein the engagement groove (132) is configured to allow the engagement protrusion (128) to enter the engagement groove (132) from the receiving groove (130) and engage with the engagement groove (132) as the first housing portion (108) rotates relative to the tubular body (112) to restrict relative movement between the first housing portion (108) and the tubular body (112).

21. The fluid heater according to claim 20, characterized in that, The housing (100) further includes a third housing portion (134), wherein the third housing portion (134) is sleeved outside the first housing portion (108) and connected to the second housing portion (110) in a non-rotatable manner, wherein the third housing portion (134) includes a first limiting portion (136) and the first housing portion (108) includes a second limiting portion (138), wherein the first limiting portion (136) engages with the second limiting portion (138) to prevent the first housing portion (108) from rotating relative to the third housing portion (134) and the second housing portion (110), thereby preventing the engaging protrusion (128) from dislodging from the engaging groove (132).

22. The fluid heater according to claim 21, characterized in that, One of the first limiting part (136) and the second limiting part (138) is in the form of a convex part, and the other is in the form of a concave part.

23. The fluid heater according to claim 2 or 19, characterized in that, The housing (100) further includes a third housing portion (134) which is sleeved outside the first housing portion (108) and connected to the second housing portion (110), wherein at least a portion of the first housing portion (108) is held between the third housing portion (134) and the second housing portion (110) to restrict axial movement of the first housing portion (108) relative to the second housing portion (110).

24. The fluid heater according to claim 23, characterized in that, The first housing portion (108) includes a limiting rib (140) disposed on its outer periphery, wherein the third housing portion (134) is in the form of a sleeve and includes an inwardly extending shoulder (142), wherein the limiting rib (140) is held between the shoulder (142) and the end of the tubular body (112).

25. The fluid heater according to claim 2 or 19, characterized in that, The tubular body (112) includes a boss (154) disposed therein, wherein the end of the first housing portion (108) and the boss (154) are adapted to abut against opposite ends of the heat-conducting unit (300) to restrict axial movement of the heat-conducting unit (300) relative to the housing (100).

26. The fluid heater according to claim 2 or 19, characterized in that, The second housing portion (110) also includes a cover portion (122) surrounding the tubular body (112), wherein a cavity is formed between the tubular body (112) and the cover portion (122).

27. The fluid heater according to claim 1 or 2, characterized in that, The first pipe fitting (104) includes an annular flange or annular groove for connection with a fluid line, and / or the second pipe fitting (106) includes an annular flange or annular groove for connection with a fluid line.

28. The fluid heater according to claim 1 or 2, characterized in that, The heating unit (200) includes a PTC heating plate (206).

29. The fluid heater according to claim 1 or 2, characterized in that, The fluid heater (10) also includes a power adjustment module for adjusting the heating power of the fluid heater (10).

30. The fluid heater according to claim 21, characterized in that, The second housing portion (110) includes a plurality of snap-fit ​​protrusions (148), and the third housing portion (134) correspondingly includes a plurality of snap fasteners (150) having snap-fit ​​holes (152), wherein the snap-fit ​​hole (152) of each snap fastener (150) engages with the corresponding snap-fit ​​protrusion (148) to connect the third housing portion (134) to the second housing portion (110) in a non-rotatable manner.

31. The fluid heater according to claim 1 or 2, characterized in that, The housing (100) includes a retainer (160) for retaining a plug (600), the retainer (160) including a first limiting protrusion (166) adapted to abut against a second limiting protrusion (602) of the plug (600) to prevent the plug (600) from disengaging from the retainer (160), wherein the retainer (160) also includes a slot (168) adjacent to the first limiting protrusion (166).

32. A cleaning device, characterized in that, The cleaning device (1) is configured to spray cleaning fluid onto a surface to be cleaned and includes at least one fluid heater according to any one of claims 1 to 28, the fluid heater (10) being used to heat the cleaning fluid.

33. The cleaning device according to claim 32, characterized in that, The cleaning device (1) includes a supply device (20), a fluid line (30) and a plurality of spray units (40), wherein the fluid line (30) delivers cleaning fluid from the supply device (20) to the plurality of spray units (40), and wherein the fluid heater (10) is connected to the fluid line (30).

34. The cleaning apparatus according to claim 33, characterized in that, The fluid pipeline (30) includes at least one branch node (31), and each of the at least one fluid heater (10) is located upstream of and adjacent to one of the branch nodes (31).

Images