Descaling head, Descaling tool and Descaling device

By designing a descaling head that adapts to the variable diameter area of ​​the cooling channel, and using cleaning blades of different radial sizes and cleaning media, the problem of incomplete cleaning by existing tools is solved, achieving more thorough scale removal and reducing the recurrence rate of blockages.

CN224382242UActive Publication Date: 2026-06-19HANS CNC SCI & TECH +1

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
HANS CNC SCI & TECH
Filing Date
2025-07-21
Publication Date
2026-06-19

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Abstract

The utility model discloses a kind of descaling cleaning head, descaling cleaning tool and descaling cleaning device, it is related to flow passage descaling cleaning technical field.The descaling cleaning head includes cleaning head body and multiple cleaning blades, and the cleaning head body is opened with inlet, outlet and cleaning flow channel, the cleaning flow channel is communicated between inlet and outlet, the axial both ends of cleaning head body are formed head and tail respectively, cleaning blade is located between head and tail and is located in the outside wall of cleaning head body, each cleaning blade is spaced apart along the axial direction of cleaning head body, and along the direction from tail to head, the radial dimension gradient of multiple cleaning blades decreases.The descaling cleaning head sets up the cleaning blade of different radial dimension to scale in corresponding radial position in cooling flow channel is cleaned, is adapted to flow passage variable area, so that the effect of cleaning scale is more thorough, reduces the recurrence rate of blockage.
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Description

Technical Field

[0001] This utility model belongs to the field of flow channel descaling and cleaning technology, and particularly relates to a descaling head, descaling tool and descaling device. Background Technology

[0002] The U-shaped (cylindrical) cooling channels inside the cold platen of the cold press are prone to scale buildup due to abnormal cooling water pH or insufficient purification. This leads to a decrease in heat exchange efficiency of over 30% and an increase in PCB warpage of 15%. Because scale nodules form within the cooling channels, the inner diameter of the channels becomes inconsistent. Existing descaling tools cannot adapt to the areas with changing channel diameters, resulting in incomplete cleaning and a high rate of recurring blockages. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a descaling head, a descaling tool, and a descaling device, addressing the issue that existing descaling tools cannot adapt to areas with changing flow channel diameters.

[0004] To address the aforementioned problems, this utility model provides a descaling head, comprising a head body and multiple cleaning blades. The head body has an inlet, an outlet, and a cleaning channel, the cleaning channel connecting the inlet and the outlet. The head body has a head and a tail at its two axial ends, respectively. The cleaning blades are disposed on the outer wall of the head body and located between the head and the tail. The cleaning blades are spaced apart along the axial direction of the head body, and the radial dimensions of the multiple cleaning blades decrease in the direction from the tail to the head.

[0005] As a further improvement to the above technical solution:

[0006] Optionally, the cleaning blade is an annular piece, which is mounted around the outer wall of the cleaning head body; or, the cleaning blade is an annular post, which is mounted around the outer wall of the cleaning head body.

[0007] Optionally, the cleaning blade is a stepped surface formed on the outer side wall of the cleaning head body.

[0008] Optionally, the descaling head further includes a cleaning cover, which is installed on the head of the cleaning head body, and the inner cavity of the cleaning cover is connected to the cleaning flow channel. The cleaning cover is provided with a plurality of through holes penetrating its inner and outer surfaces, and the plurality of through holes constitute the outlet.

[0009] Optionally, the through hole is formed on the outer peripheral wall of the cleaning hood; and / or, multiple sets of the through holes are arranged around the axis of the cleaning hood, and the opening directions of the through holes in different sets are different.

[0010] Optionally, the tail of the cleaning head body is provided with a connecting part, which is adapted to be detachably connected to the extension tube.

[0011] On the other hand, this utility model embodiment provides a descaling and cleaning tool, including an extension tube and a descaling and cleaning head as described above, wherein the tail end of the cleaning head body is installed on the extension tube.

[0012] As a further improvement to the above technical solution:

[0013] Optionally, the descaling tool further includes an impact seat and an impact handle. The impact seat is installed on the outer wall of the extension tube, and the impact handle is sleeved on the outer wall of the extension tube. The impact handle is axially movable along the extension tube to impact the impact seat.

[0014] Optionally, the descaling and cleaning tool further includes a connector mounted on the end of the extension tube away from the cleaning head body, the connector being adapted to be connected to a power unit.

[0015] In another aspect, this utility model embodiment provides a descaling and cleaning device, including a power component and a descaling and cleaning tool as described above. The power component is connected to the end of the extension tube away from the cleaning head body, and the power component is used to deliver the cleaning medium to the extension tube.

[0016] As a further improvement to the above technical solution:

[0017] The power assembly includes a pressurizing unit and a delivery hose. One end of the delivery hose is connected to the pressurizing unit, and the other end of the delivery hose is connected to the end of the extension tube furthest from the cleaning head body. The pressurizing unit is used to pressurize the cleaning medium.

[0018] This utility model provides a descaling head, descaling tool, and descaling device, which, compared with the prior art, have at least the following advantages: When it is necessary to clean scale in the cooling channel, the descaling head is extended into the cooling channel and moved along the axial direction of the cooling channel. The cleaning blades on the descaling head impact the scale at the corresponding radial position in the cooling channel, causing the scale at the corresponding radial position to detach from the inner wall of the cooling channel. The cleaning medium enters the cleaning channel from the inlet and finally flows out from the outlet, rinsing the detached scale out of the cooling channel. The descaling head is equipped with cleaning blades of different radial sizes to clean scale at corresponding radial positions in the cooling channel, adapting to areas with changing channel diameters, resulting in a more thorough descaling effect and reducing the recurrence rate of blockages. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the descaling and cleaning device provided in one embodiment of the present invention;

[0021] Figure 2 This is an exploded view of a descaling and cleaning device provided in one embodiment of this utility model;

[0022] Figure 3 for Figure 2 Enlarged view of region A in the middle;

[0023] Figure 4 for Figure 2 A magnified view of region B in the middle.

[0024] The reference numerals in the accompanying drawings are as follows:

[0025] 100. Descaling head; 110. Head body; 111. Connecting part; 120. Cleaning blade; 130. Cleaning hood; 131. Outlet; 200. Extension tube; 300. Impact seat; 400. Impact handle; 500. Connecting seat; 600. Quick connector; 700. Delivery hose. Detailed Implementation

[0026] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0027] In the description of this utility model, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] like Figures 1 to 4 As shown, an embodiment of the present invention provides a descaling head 100, which includes a head body 110 and a plurality of cleaning blades 120. The head body 110 has an inlet, an outlet and a cleaning channel, and the cleaning channel is connected between the inlet and the outlet. The head body 110 has a head and a tail at its two axial ends, respectively. The cleaning blades 120 are disposed on the outer side wall of the head body 110 and located between the head and the tail. The cleaning blades 120 are spaced apart along the axial direction of the head body 110, and the radial dimensions of the plurality of cleaning blades 120 decrease in the direction from the tail to the head.

[0030] When it is necessary to clean the scale in the cooling channel, the descaling head 100 is extended into the cooling channel and moved along the axial direction of the cooling channel. The cleaning blade 120 on the descaling head 100 impacts the scale at the corresponding radial position in the cooling channel, so that the scale at the corresponding radial position is detached from the inner wall of the cooling channel. The cleaning medium enters the cleaning channel from the inlet and finally flows out from the outlet 131. The cleaning medium washes the detached scale to flush it out of the cooling channel.

[0031] If a cleaning blade 120 is provided on the outer wall of the cleaning head body 110, in order for the cleaning blade 120 to more thoroughly remove the scale in the cooling channel, a cleaning blade 120 with the largest possible radial dimension is required. However, due to the different radial heights of the scale in the cooling channel, it is difficult to clean the scale in the cooling channel using the cleaning blade 120. Therefore, the descaling cleaning head 100 provided by this utility model is provided with cleaning blades 120 of different radial dimensions. During cleaning, the cleaning blades 120 with smaller radial dimensions near the head of the cleaning head body 110 first clean the scale near the central axis of the cooling channel. Then, the cleaning blades 120 with larger radial dimensions near the tail of the cleaning head body 110 clean the scale away from the central axis of the cooling channel. Since the scale near the central axis of the cooling channel has been cleaned, the difficulty of cleaning the scale away from the central axis of the cooling channel is reduced.

[0032] The descaling head 100 provided in one embodiment of the present invention is equipped with cleaning blades 120 of different radial sizes to clean scale at corresponding radial positions in the cooling channel. It is suitable for areas with variable diameters in the channel, making the scale removal effect more thorough and reducing the recurrence rate of blockage.

[0033] In this embodiment, the cleaning head body 110 is a hollow pipe, and a cleaning channel is formed inside the hollow pipe. Of course, it is understood that the cleaning head body 110 can also be other structures, and the cleaning channel can also be a pipe located inside the cleaning head body 110. The cleaning medium can be airflow or waterflow. The diameter of the cooling channel to be cleaned is 30mm to 50mm. The outer wall of the cleaning head body 110 is provided with four cleaning blades 120, and the radial dimensions of the four cleaning blades 120 are 20mm, 22mm, 24mm and 25mm respectively. Of course, it is understood that the outer wall of the cleaning head body 110 can also be provided with other numbers of cleaning blades 120, and the size of the cleaning blades 120 can be determined according to the diameter of the cooling channel to be cleaned, which is not limited here.

[0034] In one specific embodiment, the cleaning blade 120 is an annular piece, which is mounted around the outer wall of the cleaning head body 110. The outer edge of the annular piece can impact the scale in the cooling channel, causing the scale at the corresponding radial position to fall off from the inner wall of the cooling channel. The annular piece can be made of high-strength steel. To enhance the structural strength of the annular piece, it can be configured such that, along the direction from the inner ring to the outer ring, the annular piece gradually approaches the head of the cleaning head body 110. This structure can enhance the structural strength of the annular piece and reduce the risk of deformation due to the force of scale.

[0035] In another specific embodiment, the cleaning blade 120 is an annular post that surrounds the outer wall of the cleaning head body 110. The end face of the annular post near the head of the cleaning head body 110 can impact the scale in the cooling channel, causing the scale at the corresponding radial position to fall off from the inner wall of the cooling channel. The annular posts are connected in sequence, allowing for axial positioning of the annular posts on the cleaning head body 110, reducing the probability of axial displacement relative to the cleaning head body 110 due to the force of the scale. The annular posts can be fixed to the outer wall of the cleaning head body 110 by welding or other methods.

[0036] For another specific embodiment, please refer to [the relevant documentation]. Figure 3The cleaning blade 120 is a stepped surface formed on the outer wall of the cleaning head body 110. The radial dimension of the stepped surface gradually increases from the head to the tail of the cleaning head body 110. The stepped surface can impact the scale in the cooling channel, causing the scale at the corresponding radial position to fall off the inner wall of the cooling channel. This structure, since the cleaning blade 120 and the cleaning head body 110 are an integral structure, enhances the connection strength between the cleaning blade 120 and the cleaning head body 110 compared to the solution provided in the previous embodiment.

[0037] Please refer to the specific embodiment of the descaling head 100 provided in this utility model. Figure 3 The descaling head 100 also includes a cleaning cover 130, which is installed on the head of the head body 110. The inner cavity of the cleaning cover 130 is connected to the cleaning flow channel. The cleaning cover 130 is provided with multiple through holes penetrating its inner and outer surfaces, forming an outlet 131. The through holes are formed on the outer peripheral wall of the cleaning cover 130; multiple sets of through holes are arranged around the axis of the cleaning cover 130, and the opening direction of the through holes in different sets is different.

[0038] When it is necessary to clean the scale in the cooling channel, the descaling head 100 is extended into the cooling channel and moved along the axial direction of the cooling channel. The cleaning blade 120 on the descaling head 100 impacts the scale at the corresponding radial position in the cooling channel, so that the scale at the corresponding radial position is detached from the inner wall of the cooling channel. The cleaning medium enters the cleaning channel from the inlet and finally flows out from the outlet 131. Since the cleaning cover 130 is provided with outlets 131 in different directions, the cleaning medium can flow out from the outlets 131 in different directions to rinse the detached scale and flush it out of the cooling channel.

[0039] In one specific embodiment, the cleaning shroud 130 is conical, and the radial dimension of the cleaning shroud 130 is smaller than the radial dimension of the cleaning blade 120, which facilitates the cleaning shroud 130 to first extend into the cooling channel. The outlet 131 is opened on the side wall of the cleaning shroud 130. When the cleaning shroud 130 first extends into the cooling channel, the cleaning medium can be sprayed out from the outlet 131 located on the side wall of the cleaning shroud 130 to pre-break up the scale in the cooling channel, thereby reducing the cleaning force required by the cleaning blade 120.

[0040] For another specific embodiment, please refer to the following. Figure 3The cleaning hood 130 is a frustum, and its radial dimension is smaller than that of the cleaning blade 120, which facilitates the cleaning hood 130 to extend into the cooling channel first. The outlet 131 is located on the side wall of the cleaning hood 130. When the cleaning hood 130 first extends into the cooling channel, the cleaning medium can be sprayed out from the outlet 131 located on the side wall of the cleaning hood 130 to pre-break up the scale in the cooling channel, thereby reducing the cleaning force required by the cleaning blade 120.

[0041] In another specific embodiment, the cleaning hood 130 is a frustum, and the radial dimension of the cleaning hood 130 is smaller than the radial dimension of the cleaning blade 120, which facilitates the cleaning hood 130 to first extend into the cooling channel. The outlet 131 is opened on the side wall of the cleaning hood 130. When the cleaning hood 130 first extends into the cooling channel, the cleaning medium can be sprayed out from the outlet 131 located on the side wall of the cleaning hood 130 to pre-break up the scale in the cooling channel, thereby reducing the cleaning force required by the cleaning blade 120.

[0042] Please refer to the specific embodiment of the descaling head 100 provided in this utility model. Figure 3 The cleaning head body 110 has a connecting part 111 at its tail end, which can be detachably connected to the extension tube 200. When the tail end of the cleaning head body 110 is detachably connected to the extension tube 200 through the connecting part 111, the cleaning head body 110 can be extended into the interior of the cooling channel through the extension tube 200, thereby increasing the working range of the descaling cleaning head 100 provided in this embodiment of the present invention.

[0043] In one specific embodiment, the connecting part 111 is externally threaded, and correspondingly, the inner sidewall of the end of the extension tube 200 is provided with an internal thread, so that the connecting part 111 can be detachably connected to the extension tube 200 by means of threads.

[0044] In another specific embodiment, the connecting part 111 is a snap fastener, and correspondingly, the end of the extension tube 200 is provided with a slot. The connecting part 111 can be detachably connected to the extension tube 200 through the snap fastener and the slot.

[0045] In another specific embodiment, the connecting part 111 is a clamp. First, the end of the extension tube 200 is fitted inside the clamp, and then the clamp is used to tighten the end of the extension tube 200.

[0046] In addition, such as Figures 1 to 4As shown, another embodiment of this utility model provides a descaling tool, which includes an extension tube 200 and a descaling head 100 as provided in any of the above embodiments. The tail of the head body 110 is installed in the extension tube 200. The specific structure of the descaling head 100 is the same as described in the above embodiments. Since this descaling tool adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0047] When it is necessary to clean the scale in the cooling channel, the descaling head 100 is extended into the cooling channel through the extension pipe 200. The descaling head 100 is moved along the axial direction of the cooling channel. The cleaning blade 120 on the descaling head 100 impacts the scale at the corresponding radial position in the cooling channel, so that the scale at the corresponding radial position is detached from the inner wall of the cooling channel. The cleaning medium enters the cleaning channel from the inlet and finally flows out from the outlet 131. The cleaning medium washes the detached scale to flush it out of the cooling channel.

[0048] Please refer to the specific embodiment of the descaling and cleaning tool provided in this utility model. Figure 1 and Figure 2 The descaling tool also includes an impact seat 300 and an impact handle 400. The impact seat 300 is mounted on the outer wall of the extension tube 200, and the impact handle 400 is sleeved on the outer wall of the extension tube 200. The impact handle 400 can move axially along the extension tube 200 to impact the impact seat 300. According to inertial impact dynamics, this structure can increase the impact force of the cleaning blade 120 on the descaling head 100 on the scale at the corresponding radial position in the cooling channel, thereby facilitating the cleaning of the scale at the corresponding radial position in the cooling channel.

[0049] When it is necessary to clean the scale in the cooling channel, the descaling head 100 is extended into the cooling channel through the extension tube 200. The impact handle 400 is driven to move axially along the extension tube 200 to impact the impact seat 300, thereby driving the descaling head 100 to move axially along the cooling channel. The cleaning blade 120 on the descaling head 100 impacts the scale at the corresponding radial position in the cooling channel, so that the scale at the corresponding radial position is detached from the inner wall of the cooling channel. The cleaning medium enters the cleaning channel from the inlet and finally flows out from the outlet 131. The cleaning medium washes the detached scale to flush it out of the cooling channel.

[0050] Please refer to the specific embodiment of the descaling and cleaning tool provided in this utility model. Figure 1 and Figure 4The descaling tool also includes a connector 500, which is installed at the end of the extension tube 200 away from the cleaning head body 110. The connector 500 can be connected to a power unit. The power unit can provide cleaning media to the descaling tool and pressurize the cleaning media, causing the pressurized cleaning media to be sprayed out from the outlet 131 to flush away the loose scale and flush it out of the cooling channel.

[0051] In this embodiment, the connector 500 is threaded onto the end of the extension tube 200 furthest from the cleaning head body 110. Of course, it is understood that the connector 500 can also be installed onto the end of the extension tube 200 furthest from the cleaning head body 110 in other ways, such as by a snap-fit, etc., which is not limited here.

[0052] In addition, such as Figures 1 to 4 As shown, another embodiment of this utility model provides a descaling and cleaning device, which includes a power component and a descaling and cleaning tool as provided in any of the above embodiments. The power component is connected to the end of the extension tube 200 away from the cleaning head body 110, and the power component is used to transport the cleaning medium to the extension tube 200. The specific structure of the descaling and cleaning tool is the same as that in the above embodiments. Since this descaling and cleaning device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0053] When it is necessary to clean the scale in the cooling channel, the descaling head 100 is extended into the cooling channel through the extension pipe 200. The descaling head 100 is moved along the axial direction of the cooling channel. The cleaning blade 120 on the descaling head 100 impacts the scale at the corresponding radial position in the cooling channel, so that the scale at the corresponding radial position is detached from the inner wall of the cooling channel. The cleaning medium enters the cleaning channel from the inlet and finally flows out from the outlet 131. The power unit pressurizes the cleaning medium, so that the pressurized cleaning medium is sprayed out from the outlet 131 to flush the detached scale and flush it out of the cooling channel.

[0054] In this embodiment, please refer to the following for details. Figure 1 and Figure 4 The power unit includes a pressurizing unit and a delivery hose 700. One end of the delivery hose 700 is connected to the pressurizing unit, and the other end is connected to the end of the extension tube 200 away from the cleaning head body 110. The pressurizing unit is used to pressurize the cleaning medium. The other end of the delivery hose 700 is connected to the connecting seat 500 via a quick-connect fitting 600, which facilitates the assembly and disassembly of the delivery hose 700 and the connecting seat 500. The pressurizing unit can be a pressure pump or an air compressor.

[0055] When it is necessary to clean the scale in the cooling channel, the descaling head 100 is extended into the cooling channel through the extension pipe 200. The power unit pressurizes the cleaning medium, so that the pressurized cleaning medium is sprayed out from the outlet 131 to pre-break up the scale in the cooling channel. The descaling head 100 moves along the axial direction of the cooling channel, and the cleaning blade 120 on the descaling head 100 impacts the scale at the corresponding radial position in the cooling channel, so that the scale at the corresponding radial position falls off from the inner wall of the cooling channel. The cleaning medium enters the cleaning channel from the inlet and finally flows out from the outlet 131 to rinse the fallen scale and flush it out of the cooling channel.

[0056] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A descaling cleaning head, characterized in that, The cleaning head includes a cleaning head body and multiple cleaning blades. The cleaning head body has an inlet, an outlet, and a cleaning channel. The cleaning channel connects the inlet and the outlet. The cleaning head body has a head and a tail at its two axial ends. The cleaning blades are located on the outer wall of the cleaning head body and between the head and the tail. The cleaning blades are spaced apart along the axial direction of the cleaning head body, and the radial dimensions of the multiple cleaning blades decrease in the direction from the tail to the head.

2. The descaling wand of claim 1, wherein, The cleaning blade is an annular piece, which is mounted around the outer wall of the cleaning head body; or, the cleaning blade is an annular post, which is mounted around the outer wall of the cleaning head body.

3. The descaling wand of claim 1, wherein, The descaling head also includes a cleaning cover, which is installed on the head of the cleaning head body. The inner cavity of the cleaning cover is connected to the cleaning channel. The cleaning cover is provided with multiple through holes that penetrate its inner and outer surfaces, and the multiple through holes constitute the outlet.

4. The descaling wand of claim 3, wherein, The through holes are formed on the outer peripheral wall of the cleaning hood; and / or, multiple sets of the through holes are arranged around the axis of the cleaning hood, and the opening directions of the through holes in different sets are different.

5. The descaling wand of claim 1, wherein, The cleaning head body has a connecting part at its tail end, which is adapted to be detachably connected to the extension tube.

6. A descaling tool, characterized in that It includes an extension tube and a descaling head as described in any one of claims 1 to 5, wherein the tail end of the head body is mounted on the extension tube.

7. The descaling tool of claim 6, wherein, The descaling and cleaning tool also includes an impact seat and an impact handle. The impact seat is installed on the outer wall of the extension tube, and the impact handle is sleeved on the outer wall of the extension tube. The impact handle can move along the axial direction of the extension tube to impact the impact seat.

8. The descaling and cleaning tool according to claim 7, characterized in that, The descaling and cleaning tool also includes a connector, which is installed at the end of the extension tube away from the cleaning head body, and the connector is adapted to be connected to a power unit.

9. A descaling and cleaning device, characterized in that, The device includes a power assembly and a descaling tool as described in any one of claims 6 to 8, wherein the power assembly is connected to the end of the extension tube away from the cleaning head body, and the power assembly is used to deliver a cleaning medium to the extension tube.

10. The descaling and cleaning device according to claim 9, characterized in that, The power assembly includes a pressurizing unit and a delivery hose. One end of the delivery hose is connected to the pressurizing unit, and the other end of the delivery hose is connected to the end of the extension tube furthest from the cleaning head body. The pressurizing unit is used to pressurize the cleaning medium.