Pipeline connecting device, spraying arm assembly and dish washing machine

Abstract

The utility model belongs to the technical field of dish-washing machines, and discloses a pipeline connecting device, a spraying arm assembly and a dish-washing machine. The pipeline connecting device comprises a main body seat, a liquid inlet pipe and a lining pipe, a flow channel penetrating through the main body seat is arranged in the main body seat, a clamping part is arranged on the inner wall of the flow channel, a matching part is arranged on the outer wall of the liquid inlet pipe, the liquid inlet pipe is inserted into the flow channel, and the clamping part is clamped with the matching part to limit the liquid inlet pipe to move in the axial direction of the flow channel; the lining pipe is assembled in the liquid inlet pipe in an interference mode, the lining pipe is used for pressing the outer wall of the liquid inlet pipe on the inner wall of the flow channel and limiting the liquid inlet pipe to move in the radial direction of the flow channel, so that the liquid inlet pipe is stably connected to the main body seat, and compared with a traditional clamp fixing mode, the pipeline connecting device is simple in structure, easy to disassemble and good in sealing performance.

Description

Technical Field

[0001] The utility model relates to the technical field of dishwashers, in particular to a pipeline connecting device, a spray arm assembly and a dishwasher. Background Art

[0002] Dishwashers are common kitchen appliances in modern households, used to automatically clean tableware, plates and other kitchen utensils. Among them, the spray arm is an important part of the dishwasher, which is responsible for spraying clean water onto the surface of the tableware to achieve a cleaning effect.

[0003] In existing dishwashers, a clamp is usually used to fix the water inlet pipe at the water inlet of the dishwasher. The connection method of the clamp is complicated to disassemble and assemble, and it is not easy to operate in a narrow space. In addition, the clamp will cause certain damage to the water inlet pipe, which is easy to cause leakage of the water inlet pipe and affect the cleaning effect of the dishes. Utility Model Content

[0004] The utility model aims to provide a pipeline connecting device, which has a simple structure, is easy to disassemble and has good sealing performance.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] Pipeline connection device, including:

[0007] A main body seat, wherein a flow channel penetrating the main body seat is provided in the main body seat, and a clamping portion is provided at one end of the flow channel;

[0008] A liquid inlet pipe, wherein a matching portion is provided on an outer wall of the liquid inlet pipe, the liquid inlet pipe is at least partially inserted into the flow channel, and the clamping portion is clamped with the matching portion;

[0009] An inner liner tube is at least partially interference-fitted in the liquid inlet tube, and is used to press the outer wall of the liquid inlet tube against the inner wall of the flow channel.

[0010] Optionally, the snap-fitting portion includes an annular boss arranged at one end of the main seat and extending along the axial direction of the flow channel, the inner wall of the annular boss is provided with one of a first annular protrusion and a first annular groove, the mating portion is the other of the first annular protrusion and the first annular groove, and the first annular protrusion is at least partially embedded in the first annular groove.

[0011] Optionally, the inner liner tube is provided with an interference section, and the liquid inlet tube is provided with a fitting section, and the interference section is interference fit with the fitting section.

[0012] Optionally, the first end of the liner tube is provided with one of the second annular protrusion and the second annular groove, the inner wall of the liquid inlet pipe is provided with the other of the second annular protrusion and the second annular groove, and the second annular protrusion is at least partially embedded in the second annular groove.

[0013] Optionally, an annular pressing portion is provided at the second end of the inner liner tube, and an annular abutting surface is provided on the inner wall of the liquid inlet pipe, and the annular pressing portion is pressed against the annular abutting surface.

[0014] Optionally, the pipeline connection device further comprises a rotating sleeve, which is detachably disposed in the main body seat and rotatably connected to the main body seat, one end of the rotating sleeve is connected to the liquid inlet pipe, and the other end is connected to the spray arm.

[0015] Optionally, an annular assembly groove is formed between the engaging portion and the inner wall of the flow channel, and at least a portion of the rotating sleeve is embedded in the annular assembly groove.

[0016] Optionally, an annular groove is provided on the outer wall of the rotating sleeve, and a slider assembly is provided on the main body seat, and the slider assembly includes:

[0017] A slider, wherein a sliding cavity is provided in the main body seat, the opening direction of the sliding cavity is perpendicular to the axial direction of the flow channel, and the slider is slidably arranged in the sliding cavity;

[0018] An elastic member, one end of which is in contact with the sliding block, and the other end of which is in contact with the bottom wall of the sliding cavity. The elastic member is configured to drive at least a portion of the sliding block to be inserted into the annular groove.

[0019] Optionally, a first opening is provided on the bottom wall of the sliding cavity, and the sliding block assembly further comprises a cover, which blocks the first opening and is detachably connected to the spray arm.

[0020] Optionally, along the sliding direction of the slider, a first guide slope and a second guide slope are respectively provided on two sides of the slider.

[0021] Another object of the utility model is to provide a spray arm assembly, which simplifies the connection structure between the spray arm and the liquid inlet pipe, reduces the assembly steps, and improves the sealing performance of the connection between the liquid inlet pipe and the spray arm.

[0022] To achieve this purpose, the utility model adopts the following technical solutions:

[0023] The spray arm assembly comprises a spray arm, a liquid inlet pipe and the above-mentioned pipeline connecting device, wherein the pipeline connecting device is configured to connect the spray arm with the liquid inlet pipe.

[0024] Another object of the utility model is to provide a pipeline connecting device, which simplifies the pipeline connecting structure, makes the connection of the pipeline have better sealing performance, and improves the reliability of the dishwasher.

[0025] To achieve this purpose, the utility model adopts the following technical solutions:

[0026] A dishwasher comprises the above-mentioned pipe connecting device.

[0027] Beneficial effects:

[0028] The pipeline connecting device provided by the utility model includes a main body seat, a liquid inlet pipe and an inner lining tube, a flow channel penetrating the main body seat is provided in the main body seat, a clamping portion is provided on the inner wall of the flow channel, a matching portion is provided on the outer wall of the liquid inlet pipe, the liquid inlet pipe is inserted in the flow channel, the clamping portion is clamped with the matching portion, and the movement of the liquid inlet pipe along the axial direction of the flow channel is restricted; the inner lining tube is interference fitted in the liquid inlet pipe, and the inner lining tube is used to press the outer wall of the liquid inlet pipe against the inner wall of the flow channel, and the movement of the liquid inlet pipe along the radial direction of the flow channel is restricted, thereby firmly connecting the liquid inlet pipe to the main body seat. Compared with the traditional clamp fixing method, the pipeline connecting device has a simple structure, is easy to disassemble, and has good sealing performance.

[0029] The spray arm assembly provided by the utility model comprises a spray arm, a liquid inlet pipe and the above-mentioned pipeline connecting device. The spray arm is connected to the liquid inlet pipe through the pipeline connecting device, which simplifies the connection structure between the spray arm and the liquid inlet pipe, reduces the assembly steps, and improves the sealing performance of the connection between the liquid inlet pipe and the spray arm.

[0030] The dishwasher provided by the utility model comprises the above-mentioned pipeline connecting device, which simplifies the pipeline connecting structure, makes the connection of the pipeline have better sealing performance, and improves the reliability of the dishwasher. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The utility model provides an explosion-proof pipe connection device. Figure 1 ;

[0032] Figure 2 It is a cross-sectional view of the pipeline connection device provided by the utility model;

[0033] Figure 3 This is a cross-sectional view of the pipeline connection device provided by the utility model Figure 2 ;

[0034] Figure 4 yes Figure 2 A partial enlarged view of the middle A;

[0035] Figure 5 It is a schematic diagram of the connection structure between the spray arm and the rotating sleeve provided by the utility model;

[0036] Figure 6The utility model is a schematic diagram of the assembly structure of the slider assembly and the rotating sleeve.

[0037] In the figure:

[0038] 100, main body seat; 110, sliding cavity; 120, slider assembly; 121, slider; 1211, tongue portion; 12111, first guide slope; 12112, second guide slope; 1212, limit portion; 12121, first accommodating groove; 122, elastic member; 123, cover; 1231, second accommodating groove; 130, limit block; 131, third guide slope; 132, anti-loosening protrusion; 140, engaging portion; 141, annular boss; 142, first annular protrusion; 150, liquid inlet pipe; 151, first annular groove; 152, matching section; 153, second annular groove; 160, liner; 161, interference section; 162, second annular protrusion; 163, annular pressing portion; 170, annular assembly groove;

[0039] 200, spray arm;

[0040] 600, rotating sleeve; 610, annular groove; 630, guiding cone surface;

[0041] 800, fixing ring; 810, first limiting protrusion; 820, second limiting protrusion; 821, anti-loosening groove; 830, sealing ring. DETAILED DESCRIPTION

[0042] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0043] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0045] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0046] This embodiment provides a pipeline connection device, such as Figure 1-Figure 6 As shown, the pipeline connecting device includes a main body seat 100, a liquid inlet pipe 150 and an inner lining pipe 160. The main body seat 100 is provided with a flow channel passing through the main body seat 100, the inner wall of the flow channel is provided with a clamping portion 140, the outer wall of the liquid inlet pipe 150 is provided with a matching portion, the liquid inlet pipe 150 is at least partially inserted in the flow channel, the clamping portion 140 is clamped with the matching portion, and the liquid inlet pipe 150 is limited to move along the axial direction of the flow channel; the inner lining pipe 160 is at least partially interference fitted in the liquid inlet pipe 150, and the inner lining pipe 160 is used to press the outer wall of the liquid inlet pipe 150 against the inner wall of the flow channel, and limit the movement of the liquid inlet pipe 150 along the radial direction of the flow channel, so as to firmly connect the liquid inlet pipe 150 to the main body seat 100. Compared with the traditional clamp fixing method, the pipeline connecting device has a simple structure, is easy to disassemble, and has good sealing performance.

[0047] Alternatively, if Figure 2-Figure 3 As shown, the locking portion 140 includes an annular boss 141 which is arranged at one end of the main seat 100 and extends along the axial direction of the flow channel, and the inner wall of the annular boss 141 is provided with a first annular protrusion 142. The matching portion is arranged in a first annular groove 151 on the outer wall of the liquid inlet pipe 150, and the first annular protrusion 142 is at least partially embedded in the first annular groove 151, thereby limiting the movement of the liquid inlet pipe 150 along the axial direction of the flow channel.

[0048] In an optional embodiment, the inner wall of the annular boss 141 is provided with a first annular groove 151 extending circumferentially along the annular boss 141, and the matching part is a first annular protrusion 142 arranged on the outer wall of the liquid inlet pipe 150. The first annular protrusion 142 is embedded in the first annular groove 151, which can also limit the movement of the liquid inlet pipe 150 along the axial direction of the flow channel, thereby ensuring that the connection between the liquid inlet pipe 150 and the main seat 100 is stable.

[0049] Alternatively, if Figure 2-Figure 3 As shown, the inner lining tube 160 is provided with an interference section 161, and the liquid inlet pipe 150 is provided with a fitting section 152. The interference section 161 and the fitting section 152 are interference fit to ensure that the inner lining tube 160 limits the movement of the liquid inlet pipe 150 along the radial direction of the flow channel, while ensuring that the liquid inlet pipe 150 is sealed and connected with the spray arm 200 to avoid leakage at the connection.

[0050] Specifically, the diameter of the fitting section 152 is slightly smaller than the diameter of the interference section 161. For example, the diameter of the fitting section 152 is 17.6 mm, while the diameter of the interference section 161 is 18 mm. After the liner tube 160 is assembled in the liquid inlet pipe 150, the interference section 161 and the fitting section 152 are interference-fitted. This matching mode makes the connection between the liquid inlet pipe 150 and the main seat 100 more sealed. In this embodiment, the diameter of the interference section 161 and the diameter of the fitting section 152 are not specifically limited, and can be adjusted and optimized according to actual needs and application scenarios.

[0051] Optionally, a second annular protrusion 162 is provided at the first end of the inner liner tube 160, and a second annular groove 153 is provided on the inner wall of the liquid inlet pipe 150. The second annular protrusion 162 is at least partially embedded in the second annular groove 153, thereby limiting the axial movement of the inner liner tube 160 along the liquid inlet pipe 150. In this way, unnecessary movement of the inner liner tube 160 due to vibration or pressure changes during use can be avoided, thereby ensuring the firmness and stability of the connection.

[0052] Furthermore, a chamfer is provided at the bottom of the first annular protrusion 142, which can reduce the resistance during the assembly of the liner tube 160, making the assembly smoother and more convenient.

[0053] In an optional embodiment, a second annular groove 153 is provided at the first end of the inner liner tube 160, and a second annular protrusion 162 is provided on the inner wall of the liquid inlet pipe 150. The second annular protrusion 162 is embedded in the second annular groove 153, further ensuring that the connection between the inner liner tube 160 and the liquid inlet pipe 150 is more stable.

[0054] Optionally, an annular clamping portion 163 is provided at the second end of the inner liner tube 160, and an annular abutment surface is provided on the inner wall of the liquid inlet pipe 150. The annular clamping portion 163 is pressed against the annular abutment surface, further improving the stability of the inner liner tube 160 and helping to ensure the sealing between the inner liner tube 160 and the liquid inlet pipe 150.

[0055] Optionally, in this embodiment, the liquid inlet pipe 150 is a rubber water pipe, which has high flexibility and can be easily installed on the main body seat 100; the rubber water pipe has good corrosion resistance and wear resistance, and can withstand the corrosion of common detergents in dishwashers and the impact of high-pressure water flow. This durability ensures the long-term reliability of the connecting device and extends the service life of the dishwasher.

[0056] Optionally, the inner liner tube 160 in this embodiment is made of plastic material, which has good corrosion resistance and can resist the erosion of detergents and high-pressure water used in dishwashers, thereby extending the service life of the inner liner tube 160. In addition, the plastic material is relatively light, and installation and maintenance are more convenient, reducing the labor intensity of operators.

[0057] Alternatively, if Figure 4-Figure 5 As shown, the pipeline connection device further includes a rotating sleeve 600, which is detachably disposed in the main body seat 100 and rotatably connected to the main body seat 100. One end of the rotating sleeve 600 is connected to the liquid inlet pipe 150, and the other end is connected to the spray arm 200. The detachable setting of the rotating sleeve 600 makes the replacement and maintenance of the spray arm 200 more convenient. When maintenance or replacement is required, the user can easily remove the rotating sleeve 600 and then replace or repair the spray arm 200 without disassembling the entire connection device, saving maintenance time and cost.

[0058] Optionally, an annular assembly groove 170 is formed between the locking portion 140 and the inner wall of the flow channel, and at least a portion of the rotating sleeve 600 is embedded in the annular assembly groove 170, which effectively utilizes the space, makes the structure of the connecting device more compact, helps to reduce the overall volume and size of the connecting device, and improves the utilization rate of the internal space of the dishwasher.

[0059] Optionally, an annular groove 610 is provided on the outer wall of the rotating sleeve 600, and a slider assembly 120 is provided on the main body seat 100. The slider assembly 120 includes a slider 121 and an elastic member 122. A sliding cavity 110 is provided in the main body seat 100. The opening direction of the sliding cavity 110 is perpendicular to the axial direction of the flow channel. The slider 121 is slidably set in the sliding cavity 110. One end of the elastic member 122 abuts against the slider 121, and the other end abuts against the bottom wall of the sliding cavity 110. Under the action of the elastic force of the elastic member 122, at least part of the slider 121 is inserted into the annular groove 610 of the rotating sleeve 600. The slider 121 allows the rotating sleeve 600 to rotate along the circumferential direction of the flow channel, while limiting the movement of the rotating sleeve 600 along the axial direction of the flow channel, thereby ensuring that the rotating sleeve 600 will not fall out of the flow channel.

[0060] Specifically, when the rotating sleeve 600 is inserted into the main body seat 100 along the flow channel, the outer wall of the rotating sleeve 600 squeezes the slider 121 so that the slider 121 retreats into the sliding cavity 110. At this time, the elastic member 122 is compressed and accumulates elastic force. When the rotating sleeve 600 is inserted into place, the annular groove 610 is opposite to the slider 121. Under the elastic force of the elastic member 122, part of the slider 121 extends out of the sliding cavity 110 and is inserted into the annular groove 610, so that it is fixed in the main body seat 100. The disassembly process of the rotating sleeve 600 is opposite to the installation process, which will not be repeated here.

[0061] Alternatively, if Figure 1-Figure 2 As shown, in this embodiment, two slider assemblies 120 are provided on the main body seat 100, and the two slider assemblies 120 are relatively arranged on both sides of the main body seat 100, ensuring the force balance of the rotating sleeve 600 and improving the stability of the rotating sleeve 600. It should be noted that, since the spray arm 200 needs to rotate when cleaning the tableware, the rotating sleeve 600 needs to be connected to the power source. For example, the power source includes a motor, a first gear and a second gear, a first gear is provided between the rotating sleeve 600 and the spray arm 200, the first gear is meshed with the second gear, the second gear is connected to the output shaft of the motor, and one side of the first gear is connected to the rotating sleeve 600, and the other side is connected to the spray arm 200, and a channel is provided in the middle of the first gear to connect the inner cavity of the rotating sleeve 600 and the spray hole of the spray arm 200. This design ensures that the cleaning water can be smoothly transmitted from the rotating sleeve 600 to the spray arm 200 and sprayed from the spray hole.

[0062] In other embodiments, the rotating sleeve 600 may be directly connected to the output shaft of the driving motor, which can further simplify the structure of the pipeline connecting device and improve assembly efficiency.

[0063] Optionally, a first opening is provided on the bottom wall of the sliding cavity 110 , and the slider assembly 120 further includes a cover 123 , which blocks the first opening and is detachably connected to the main base 100 . The setting of the cover 123 facilitates the assembly of the slider 121 and the elastic member 122 in the sliding cavity 110 .

[0064] Optionally, the cover 123 is fastened to the main body 100 by screws. Specifically, a through hole is provided on the cover 123, and a threaded hole is provided at a position corresponding to the through hole on the main body 100, and the screw passes through the through hole and is inserted into the threaded hole, and the screw is threadedly connected with the main body 100 to achieve stable fixing of the cover 123 on the main body 100.

[0065] Optionally, the cover 123 is threadedly connected to the main body 100. Specifically, the cover 123 is provided with a first thread, and the inner wall of the sliding cavity 110 is provided with a second thread, and the first thread and the second thread are screwed together to ensure that the cover 123 is stably fixed on the main body 100.

[0066] Optionally, the cover 123 is snap-fitted with the main body 100. Specifically, one of the cover 123 and the main body 100 is provided with a first buckle, and the other is provided with a first slot, and the first buckle is snap-fitted to the first slot, so as to realize the quick installation of the cover 123 on the main body 100, while ensuring the stability of the cover 123.

[0067] Optionally, the slider 121 includes a tongue portion 1211 and a limiting portion 1212. A second opening matching the tongue portion 1211 is provided at one end of the sliding cavity 110 close to the flow channel. The tongue portion 1211 can pass through the second opening and be inserted into the annular groove 610. The limiting portion 1212 abuts against the inner side of the second opening. The limiting portion 1212 can limit the tongue portion 1211 from falling out of the sliding cavity 110, thereby preventing the slider 121 from accidentally falling off or shifting during use.

[0068] Optionally, a first accommodating groove 12121 is provided at one end of the limiting portion 1212 away from the tongue portion 1211, and a second accommodating groove 1231 is provided on the cover 123. One end of the elastic member 122 is inserted in the first accommodating groove, and the other end is inserted in the second accommodating groove 1231 to ensure the normal working state of the elastic member 122 and improve the reliability of the slider assembly 120.

[0069] Optionally, the elastic member 122 is a spring, which can provide a more stable elastic force and has a longer service life, thereby enhancing the stability of the connection and ensuring the normal operation of the spray arm 200.

[0070] Alternatively, if Figure 6 As shown, a guide cone 630 is provided at the bottom of the rotating sleeve 600, and the guide cone 630 is used to guide the rotating sleeve 600 to be assembled in the main body seat 100, and the guide cone 630 can reduce the contact resistance between the rotating sleeve 600 and the slider 121 during the assembly process, so that the rotating sleeve 600 can more easily drive the slider 121 to return to the sliding cavity 110, so that the user can more easily and correctly install the rotating sleeve 600 on the main body seat 100.

[0071] Optionally, along the sliding direction of the slider 121, a first guide bevel and a second guide bevel 12112 are respectively provided on both sides of the slider 121. The first guide bevel 12111 can reduce the resistance when the rotating sleeve 600 is inserted, ensuring that the slider 121 can be driven back to the sliding cavity 110 by the rotating sleeve 600 when the rotating sleeve 600 is assembled, thereby improving the smoothness and assembly efficiency during the assembly process. The second guide bevel 12112 can reduce the resistance when the rotating sleeve 600 is pulled out, ensuring that the slider 121 can be driven back to the sliding cavity 110 by the rotating sleeve 600 when the rotating sleeve 600 is disassembled, thereby improving the smoothness and assembly efficiency during the disassembly process.

[0072] Optionally, the main body seat 100 can be detachably connected to the inner tank of the dishwasher, which facilitates the assembly of the main body seat 100. Specifically, an assembly hole is provided on the inner tank, and the top of the main body seat 100 is passed through the assembly hole and connected to the fixing ring 800, and part of the inner tank is clamped between the fixing ring 800 and the main body seat 100.

[0073] Optionally, a plurality of limit blocks 130 are provided at the top of the main body seat 100 along the circumferential direction of the main body seat 100, and a plurality of limit grooves are provided on the inner side of the fixing ring 800 along the circumferential direction of the fixing ring 800. When the top of the main body seat 100 is inserted into the assembly hole of the inner tank of the dishwasher, the fixing ring 800 is rotatably assembled on the top of the spray arm 200, and each limit block 130 is correspondingly limited in a limit groove, and part of the inner tank is clamped between the fixing ring 800 and the main body seat 100, thereby fixing the main body seat 100 on the inner tank.

[0074] Optionally, the limiting groove is formed by a first limiting protrusion 810 and a second limiting protrusion 820, and the second limiting protrusion 820 is perpendicular to the first limiting protrusion 810. After the fixing ring 800 is rotated into place, the first limiting protrusion 810 is used to limit the fixing ring 800 from continuing to rotate along the circumferential direction of the main seat 100, and the second limiting protrusion 820 is used to limit the fixing ring 800 from separating from the main seat 100 along the axial direction of the main seat 100.

[0075] Optionally, an anti-loosening groove 821 is provided on the second limiting protrusion 820, and an anti-loosening protrusion 132 is provided on the main body seat 100. After the fixing ring 800 is rotated into place, the anti-loosening protrusion 132 is limited in the anti-loosening groove 821, thereby preventing the fixing ring 800 from loosening due to vibration and the like, thereby improving the tightness of the fixing ring 800.

[0076] Optionally, the pipeline connection structure also includes a sealing ring 830, which is sleeved on the main body seat 100 and located between the main body seat 100 and the inner tank. The sealing ring 830 can ensure the sealing of the connection between the main body seat 100 and the inner tank to prevent the inner tank from leaking, and at the same time prevent dust and other impurities from entering the inner tank of the dishwasher through the gap.

[0077] Optionally, along the direction in which the fixing ring 800 is screwed in, a third guiding slope 131 is provided at the end of the limiting block 130 . The third guiding slope 131 can reduce the resistance when the fixing ring 800 is screwed in, thereby improving the assembly efficiency.

[0078] The present embodiment provides a spray arm assembly, including a spray arm 200, a liquid inlet pipe 150 and the above-mentioned pipeline connecting device. The spray arm 200 is connected to the liquid inlet pipe 150 through the pipeline connecting device, which simplifies the connection structure between the spray arm 200 and the liquid inlet pipe 150, reduces the assembly steps, and improves the sealing of the connection between the liquid inlet pipe 150 and the spray arm 200.

[0079] This embodiment also provides a dishwasher, which includes the above-mentioned pipeline connecting device, simplifies the pipeline connection structure, makes the connection of the pipeline have better sealing performance, and improves the reliability of the dishwasher.

[0080] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A pipe connection device, characterized in that: include: A main body seat (100), wherein a flow channel penetrating the main body seat (100) is provided in the main body seat (100), and a clamping portion (140) is provided at one end of the flow channel; A liquid inlet pipe (150), wherein the outer wall of the liquid inlet pipe (150) is provided with a matching portion, the liquid inlet pipe (150) is at least partially inserted into the flow channel, and the engaging portion (140) is engaged with the matching portion; An inner lining tube (160), wherein the inner lining tube (160) is at least partially interference-fitted in the liquid inlet tube (150), and the inner lining tube (160) is used to press the outer wall of the liquid inlet tube (150) against the inner wall of the flow channel.

2. The pipe connection device according to claim 1, characterized in that: The engaging portion (140) comprises an annular boss (141) which is arranged at one end of the main body seat (100) and extends along the axial direction of the flow channel, the inner wall of the annular boss (141) is provided with one of a first annular protrusion (142) and a first annular groove (151), the matching portion is the other of the first annular protrusion (142) and the first annular groove (151), and the first annular protrusion (142) is at least partially embedded in the first annular groove (151).

3. The pipe connection device according to claim 1, characterized in that: The inner lining tube (160) is provided with an interference section (161), and the liquid inlet tube (150) is provided with a matching section (152), and the interference section (161) is interference-fitted with the matching section (152).

4. The pipe connection device according to claim 1, characterized in that: The first end of the inner liner tube (160) is provided with one of the second annular protrusion (162) and the second annular groove (153), and the inner wall of the liquid inlet tube (150) is provided with the other of the second annular protrusion (162) and the second annular groove (153), and the second annular protrusion (162) is at least partially embedded in the second annular groove (153).

5. The pipeline connection device according to claim 1, characterized in that: The second end of the inner liner tube (160) is provided with an annular pressing portion (163), and the inner wall of the liquid inlet tube (150) is provided with an annular abutting surface, and the annular pressing portion (163) is pressed against the annular abutting surface.

6. The pipeline connection device according to claim 1, characterized in that: The pipeline connection device also includes a rotating sleeve (600), which is detachably disposed in the main body seat (100) and rotatably connected to the main body seat (100), one end of the rotating sleeve (600) is connected to the liquid inlet pipe (150), and the other end is connected to the spray arm (200).

7. The pipeline connection device according to claim 6, characterized in that: An annular assembly groove (170) is formed between the engaging portion (140) and the inner wall of the flow channel, and at least a portion of the rotating sleeve (600) is embedded in the annular assembly groove (170).

8. The pipeline connection device according to claim 6, characterized in that: The outer wall of the rotating sleeve (600) is provided with an annular groove (610), and the main body seat (100) is provided with a slider assembly (120), and the slider assembly (120) comprises: A sliding block (121), wherein a sliding cavity (110) is provided in the main body seat (100), the opening direction of the sliding cavity (110) is perpendicular to the axial direction of the flow channel, and the sliding block (121) is at least partially slidably disposed in the sliding cavity (110); An elastic member (122), one end of the elastic member (122) abuts against the slider (121), and the other end abuts against the bottom wall of the sliding cavity (110), and the elastic member (122) is configured to drive at least a portion of the slider (121) to be inserted into the annular groove (610).

9. The pipeline connection device according to claim 8, characterized in that: The bottom wall of the sliding cavity (110) is provided with a first opening, and the sliding block assembly (120) further comprises a cover (123), wherein the cover (123) blocks the first opening and is detachably connected to the main body seat (100).

10. The spray arm assembly is characterized in that: It comprises a spray arm, a liquid inlet pipe and a pipeline connecting device as described in any one of claims 1 to 9, wherein the pipeline connecting device is configured to connect the spray arm with the liquid inlet pipe.

11. A dishwasher, characterized in that The invention comprises the pipeline connecting device according to any one of claims 1 to 9.

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