Noise reduction device for drainage pump, drainage pump and washing and protecting device

Abstract

The invention relates to the technical field of drainage pumps, in particular to a noise reduction device for a drainage pump, the drainage pump and a washing and protecting device, and aims to solve the problems of noise reduction and reliability of a drainage pump of an existing washing and protecting device. In order to achieve the purpose, the noise reduction device for the drainage pump comprises a noise reduction device body, a drainage channel communicated with the drainage pump is arranged in the noise reduction device body, and a non-return moving part is arranged in the drainage channel; in the opening state, the non-return moving part moves by a corresponding distance along the drainage channel along with the pushing force change of water flow or air flow, and the drainage channel is opened. And in the closed state, the non-return moving part restores to the position where the drainage channel is blocked. The noise reduction device can remarkably reduce noise of the drainage pump under the condition that the drainage function is not affected, reliability is high, and the using effect is good.

Description

Technical Field

[0001] The present invention relates to the technical field of drainage pumps, and specifically provides a noise reduction device for a drainage pump, a drainage pump, and a washing and protecting device. Background Art

[0002] For washing and care equipment that uses a drainage pump as the drainage power element, such as a washing machine, the drainage pump will emit a loud humming sound during the drainage stage after washing, especially periodic noise at the end of drainage; and after drainage, there is serious water accumulation in the pump, which seriously affects the user's evaluation of the product. Usually, the noise is reduced by replacing a higher-power or other type of drainage pump, which brings higher cost problems. The main reasons for the above technical problems are: the drainage pump generates noise due to the coexistence of gas and liquid phases; in the final stage of drainage, there is less water in the pump, and the water in the drainage pipe flows back due to gravity to impact the pump blades, forming a water hammer effect, which causes periodic noise and reduces the life of the pump blades.

[0003] Chinese patent CN210889502U discloses a low-noise drainage pump including a washing device of the drainage pump, which is used to solve the problem of drainage noise caused by the coexistence of water and air. Its technical solution discloses that a blocking sheet is arranged at the drainage end, which is installed above the impeller cavity, that is, above the impeller cavity along the vertical direction V; the blocking sheet can be made of elastic materials such as rubber, which has a certain elastic deformation capacity; when the blocking sheet is in the closed position, the air in the impeller cavity can be discharged through the air holes in the blocking sheet, and will not accumulate in the impeller cavity; the water flow in the drainage pipe can slowly flow back to the impeller cavity through the air holes, and this slow backflow further reduces the noise. In actual application, the blocking sheet of the above patent solution uses a rubber spring sheet, which will deform when the air pressure changes in the pipeline, resulting in a poor seal and failure, and low reliability.

[0004] And technical personnel in this field need to solve how to reduce the noise of the drainage pump without affecting the drainage function, that is, to significantly improve the periodic noise at the end of drainage, while eliminating the problem of drainage pipe blockage.

[0005] In view of the above-mentioned problems of the prior art, how to provide a noise reduction device for a drainage pump and a technical problem that those skilled in the art of drainage pumps and washing and care devices need to solve urgently. Summary of the invention

[0006] The present invention aims to solve the above technical problems, that is, to solve the problems existing in the existing drainage pump of the washing and care device in terms of noise reduction and reliability.

[0007] In a first aspect, the present invention provides a noise reduction device for a drainage pump, comprising a noise reduction device body, wherein the interior of the noise reduction device body has a drainage passage connected to the drainage pump, and a non-return movable part is arranged in the drainage passage; in an open state, the non-return movable part moves along the drainage passage a corresponding distance as the driving force of the water flow or air flow changes, and the drainage passage is conductive; in a closed state, the non-return movable part returns to the position of blocking the drainage passage.

[0008] When adopting the above-mentioned technical solution, the present invention achieves blocking or opening of the drainage passage through the anti-return movable part. It should be noted that as the flow rate of water or air flow is different, the corresponding driving force is different, and then the anti-return movable part moves a corresponding distance under the action of different driving forces. Moving the corresponding distance here can be understood as moving to different positions, so that the problem of noise generated by drainage backflow can be solved by blocking the anti-return movable part in the later stage of drainage, and the movement with the size of water flow or air flow can avoid the problem of drainage blockage.

[0009] Furthermore, a positioning locking portion is provided in the drainage passage, and the positioning locking portion separates the drainage passage into a first passage and a second passage, the first passage is connected to the drainage pump, and the anti-return movable part is located in the second passage; in an open state, the anti-return movable part moves a corresponding distance along the second passage as the driving force of the water flow or air flow changes, and the first passage is connected to the second passage; in a closed state, the anti-return movable part returns to the position of the positioning locking portion to block the drainage passage.

[0010] Under the condition of adopting the above-mentioned technical scheme, the present invention provides a specific structure of the anti-return movable part to achieve blocking. It can be understood that when the anti-return movable part returns to the position of the positioning locking part, under the action of the anti-return movable part's own gravity or applied force, a sealing structure is formed between the two, which can effectively prevent the water backflow of the drainage pipe from impacting the drainage pump blades and generating noise in the later stage of drainage.

[0011] Furthermore, the anti-return movable part is an anti-return ball; in the open state, the anti-return ball moves a corresponding distance along the second passage as the driving force of the water flow or air flow changes; a gap for the water flow or air flow to pass through is formed between the inner wall of the second passage and the outer wall of the anti-return ball.

[0012] In the case of adopting the above-mentioned technical scheme, the present invention provides a specific structure of the anti-return movable part, and technical personnel in this field can specifically set the size of the gap for the water flow or air flow to pass through. For example, as the moving distance of the anti-return ball increases, the thrust of the water flow or air flow increases, and the gap for the water flow or air flow to pass through increases accordingly.

[0013] Furthermore, the inner wall of the second passage is formed with a plurality of guide protrusions extending axially and evenly distributed circumferentially, and the grooves between adjacent guide protrusions are the gaps for water flow or air flow to pass through; the non-return ball moves a corresponding distance along the second passage under the guiding action of the plurality of guide protrusions; and the inner wall of the second passage is formed with a limiting step for limiting the moving distance of the non-return ball.

[0014] When adopting the above-mentioned technical solution, the present invention provides a specific structure for forming a gap for water flow or air flow to pass through. It should be noted that a plurality of guide protrusions contact the outer wall of the check ball to guide it, and the check ball moves along the guide protrusions as the driving force of the water flow or air flow changes; when the check ball moves along the second passage to the position of the limit step under the driving action of the water flow or air flow, the limit step blocks the continued movement of the check ball.

[0015] Furthermore, the drainage passage also includes a bypass connected to the second passage; in an open state, the check ball moves a corresponding distance as the driving force of the water flow or air flow changes, at least a portion of the check ball is located in the bypass, and the second passage is connected to the first passage; in a closed state, the check ball returns from the bypass to the position of the positioning locking portion to block the drainage passage.

[0016] While adopting the above technical solution, the present invention provides another specific structure of the drainage passage. By setting a bypass, when the water flow or air flow is large, the check ball moves to the bypass position, and the large water flow or air flow is discharged through the second passage, which can avoid blocking the drainage passage to the greatest extent.

[0017] Furthermore, the main body of the noise reduction device adopts a split structure and includes a non-return base, a connecting nut and a non-return guide portion; one end of the non-return base is connected to the water outlet end of the drainage pump, and the other end thereof is formed with the positioning locking portion; one end of the non-return guide portion is connected to the positioning locking portion through the connecting nut, and the other end thereof is connected to the drainage pipe; the non-return base and the non-return guide portion are both formed with cavities inside and are interconnected to define the drainage passage.

[0018] When the above technical solution is adopted, the present invention provides a specific structure of the noise reduction device body.

[0019] Furthermore, an annular flange is formed at one end of the positioning locking portion, and an annular clamping plate corresponding to the annular flange is formed at one end of the connecting nut, and the annular flange is located inside the connecting nut and is clamped and limited by the annular clamping plate; the other end of the connecting nut is correspondingly connected to the non-return guide portion, and the non-return guide portion and the corresponding ends of the non-return base are tightly pressed against each other.

[0020] Furthermore, the noise reduction device body adopts an integral structure; an installation opening for installing the check ball is provided at one end of the bypass away from the second passage, and the installation opening is detachably connected to a bypass cover.

[0021] When the above technical solution is adopted, the present invention provides another specific structure of the noise reduction device body.

[0022] Furthermore, when the driving force of the water flow or air flow reaches a first preset value, the check ball moves a first distance and is located in the second passage, and the water flow or air flow is discharged through the gap; when the driving force of the water flow or air flow reaches a second preset value, the check ball moves a second distance and at least a part of it is located in the bypass, and the water flow or air flow is discharged through the second passage; and the first preset value is less than the second preset value.

[0023] When adopting the above-mentioned technical solution, the present invention provides a specific structure in which the check ball moves corresponding to the change of water flow or air flow. It should be noted that the first preset value here is a smaller driving force value that can push the check ball to move, that is, it corresponds to a smaller water flow or air flow that can push the check ball to move for drainage; the second preset value is the driving force corresponding to a larger flow of water or air flow. At this time, the larger flow of water or air flow needs to be discharged through the second passage to avoid blockage.

[0024] Furthermore, the noise reduction device body also includes an elastic element, which is used to provide elastic force to the anti-return ball; when the anti-return ball moves a first distance, the elastic element produces a first deformation; when the anti-return ball moves a second distance, the elastic element produces a second deformation.

[0025] When adopting the above technical solution, the present invention provides a specific structure for providing additional applied force to the anti-return ball. It can be understood that those skilled in the art can specifically set the connection structure between the elastic element and the anti-return ball. For example, the two ends of the elastic element can be respectively connected to the inner wall of the drainage passage and the outer wall of the anti-return ball. When the anti-return ball moves, the elastic element is deformed accordingly, and the deformation process of the elastic element changes continuously with the movement of the anti-return ball.

[0026] In a second aspect, the present invention further provides a drainage pump, comprising the above-mentioned noise reduction device for a drainage pump.

[0027] In a third aspect, the present invention further provides a washing and care device, comprising a drainage pump, wherein the water outlet end of the drainage pump is provided with the above-mentioned noise reduction device for the drainage pump.

[0028] Furthermore, a drainage pipe is also included, and the noise reduction device is integrally connected to the drainage pump and the drainage pipe respectively or is detachably connected thereto.

[0029] When the above technical solution is adopted, the beneficial effects of the present invention are:

[0030] (1) The present invention moves the anti-return movable part in the drainage passage. In the early stage of drainage, the water flow or the air flow in the pipe pushes the anti-return movable part to move along the drainage passage, so that the drainage passage is open; in the later stage of drainage, the water flow from the drainage pipe flows back, and the anti-return movable part is restored to its original position under the action of its own gravity or the elastic force of the elastic part, specifically the position of the positioning locking part for blocking. The position of the anti-return movable part in the drainage passage changes with the driving force of the water flow or air flow, so that the water backflow of the drainage pipe in the late stage of drainage can be prevented from impacting the drainage pump to cause a large noise and can avoid blockage; in the early stage of drainage, the gas in the pipeline can be discharged with the drainage, so as to avoid the noise generated by the coexistence of gas and liquid in the drainage pump; the movement of the anti-return movable part can reduce the noise of the drainage pump without affecting the drainage, and the reliability is high;

[0031] (2) The anti-return movable part of the present invention is specifically an anti-return ball in the drainage channel. First, when the water flow is relatively small, the anti-return ball is moved in the second passage of the drainage channel to discharge the water or air through the gap between the anti-return ball and the inner wall of the drainage channel; second, when the water flow is relatively large, a bypass is added, and the anti-return ball moves to the bypass under the push of the water or air flow. At this time, the water or air flow is discharged through the second passage and will not affect the drainage. In specific applications, technical personnel in this field can set up drainage through the above-mentioned first method alone or the above-mentioned second method alone according to specific circumstances, and can also adopt a combination of the two methods, which can move the anti-return ball to different positions according to the flow rate of water or air flow and the size of the driving force to ensure that noise is reduced without blocking the drainage. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0033] Figure 1 is a cross-sectional view of a first embodiment of the noise reduction device for a drainage pump of the present invention in an open state;

[0034] Figure 2 is a cross-sectional view of a first embodiment of a noise reduction device for a drainage pump of the present invention in a closed state;

[0035] Figure 3 It is a three-dimensional view of the corresponding connection position between the noise reduction device for a drainage pump of the present invention and the drainage pump;

[0036] Figure 4It is a cross-sectional view of the corresponding connection position between the noise reduction device for a drainage pump of the present invention and the drainage pump;

[0037] Figure 5 is an exploded view of a first embodiment of a noise reduction device for a drainage pump according to the present invention;

[0038] Figure 6 It is an exploded view of the first embodiment of the noise reduction device for a drainage pump of the present invention and the installation of the drainage pump;

[0039] Figure 7 It is a three-dimensional schematic diagram of the connection between the noise reduction device for a drainage pump of the present invention and a drainage pipe;

[0040] Figure 8 is a cross-sectional view of a second embodiment of the noise reduction device for a drainage pump of the present invention in an open state;

[0041] Fig. 9 is a cross-sectional view of a second embodiment of the noise reduction device for a drainage pump of the present invention in a closed state;

[0042] Fig.10 is an exploded view of a second embodiment of the noise reduction device for a drainage pump of the present invention;

[0043] Fig.11 is a cross-sectional view of a third embodiment of the noise reduction device for a drainage pump of the present invention in an open state;

[0044] Fig.12 is a cross-sectional view of a third embodiment of the noise reduction device for a drainage pump of the present invention in a closed state;

[0045] Fig.13 Schematic diagram of water flow of the washing and protecting device of the present invention at the initial stage of drainage;

[0046] Fig.14 It is a schematic diagram of water flow of the washing and protecting device of the present invention in the late stage of drainage.

[0047] Reference numerals list :

[0048] 1-drainage passage; 2-anti-return movable part; 3-positioning locking part; 11-first passage; 12-second passage; 13-bypass; 14-guide protrusion; 100-noise reduction device body; 101-anti-return base; 102-connecting nut; 103-anti-return guide part; 131-bypass cover; 200-drainage pump; 300-drainage pipe; 400-washing device. DETAILED DESCRIPTION

[0049] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. For example, although the steps of the method of the present invention are described in a specific order in this application, these orders are not restrictive. Without departing from the basic principles of the present invention, those skilled in the art can perform the steps in different orders.

[0050] like Figures 1 to 14 As shown, the embodiment of the present invention discloses a noise reduction device for a drainage pump, including a noise reduction device body 100, wherein the noise reduction device body 100 has a drainage passage 1 connected to a drainage pump 200, and a non-return movable part 2 is arranged in the drainage passage 1; in the open state, the non-return movable part 2 moves along the drainage passage 1 along the corresponding distance with the change of the driving force of the water flow or air flow, and the drainage passage 1 is connected; in the closed state, the non-return movable part 2 returns to the position of blocking the drainage passage 1. The open state here corresponds to the state of water flow or air flow discharge, and the closed state corresponds to the state of drainage reflux in the later stage of drainage or the state when drainage is not conducted.

[0051] Those skilled in the art can understand that the anti-return movable part 2 can move a corresponding distance as the driving force of the airflow or water flow changes, and can reduce the noise of the drainage pump 200 without affecting the drainage blockage pipeline, and the entire device has high reliability.

[0052] As a preferred embodiment of the present invention, Figure 4 , Figure 6 , Figure 8 and Fig. 9 As shown, a positioning locking part 3 is provided in the drainage passage 1, and the positioning locking part 3 divides the drainage passage into a first passage 11 and a second passage 12. The first passage 11 is connected to the drainage pump 200, and the anti-return movable part 2 is located in the second passage 12; in the open state, the anti-return movable part 2 moves a corresponding distance along the second passage 12 with the change of the driving force of the water flow or air flow, and the first passage 11 is connected to the second passage 12; in the closed state, the anti-return movable part 2 returns to the position of the positioning locking part 3 to block the drainage passage 1. Those skilled in the art can specifically set the specific structure of the positioning locking part 3, for example, the positioning locking part 3 can be a step sealed with the anti-return movable part 2 or an inner cone sealed by a conical surface.

[0053] It should be noted that the anti-return movable member 2 and the positioning locking portion 3 are sealed at the contact position. In order to improve the sealing effect, a sealing ring can be added or the contact force can be increased to strengthen the sealing, for example, by increasing the elastic force to increase the contact force to strengthen the sealing.

[0054] As a preferred embodiment of the present invention, Figure 1-6As shown, the anti-return movable part 2 is an anti-return ball; in the open state, the anti-return ball moves a corresponding distance along the second passage 12 as the driving force of the water flow or air flow changes; a gap for water flow or air flow to pass through is formed between the inner wall of the second passage 12 and the outer wall of the anti-return ball.

[0055] As a preferred embodiment of the present invention, Figure 5 As shown, the inner wall of the second passage 12 is formed with a plurality of guide protrusions 14 extending along the axial direction and uniformly distributed along the circumferential direction, and the grooves between adjacent guide protrusions 14 are gaps for water flow or air flow to pass through; the non-return ball moves a corresponding distance along the second passage 12 under the guidance of the plurality of guide protrusions 14; and the inner wall of the second passage 12 is formed with a limiting step for limiting the moving distance of the non-return ball. It should be noted that the role of the limiting step here is to limit the moving distance of the non-return ball in the second passage 12, so as to prevent the non-return ball from rushing out of the second passage 12 under the impact of water flow or air flow.

[0056] Those skilled in the art can understand that, driven by water flow or air flow, the outer wall of the check ball slides between the guide protrusions 14 , and the water flow or air flow enters the second passage 12 from the first passage 11 and is discharged through the gap between adjacent guide protrusions 14 .

[0057] As a preferred embodiment of the present invention, Figure 8-Figure 12 As shown, the drainage passage 1 also includes a bypass 13 connected to the second passage 12; in the open state, the check ball moves a corresponding distance as the driving force of the water flow or air flow changes, at least a part of the check ball is located in the bypass 13, and the second passage 12 is connected to the first passage 11; in the closed state, the check ball returns from the bypass 13 to the position of the positioning locking portion 3 to block the drainage passage 1.

[0058] It should be noted that the anti-return ball of the present invention moves to the bypass 13 position under the push of water flow, which can avoid blocking the drainage passage 1, and in the later stage of drainage or after drainage is completed, the anti-return ball returns to the position in contact with the positioning locking part 3 under the action of its own gravity or elastic force; in order to ensure that the anti-return ball can move to the bypass position, it can be known that a limiting track is provided for the movement of the anti-return ball, which can be specifically a limiting groove or a limiting protrusion, and the anti-return ball moves to the bypass along the limiting track under the push of water flow or air flow; in order to facilitate the recovery of the anti-return ball, an inclined portion can be provided on the limiting track, and the anti-return ball returns to the position of sealing contact with the positioning locking part 3 along the inclined portion.

[0059] As a preferred embodiment of the present invention, Figure 5 and Figure 6As shown, the noise reduction device body 100 adopts a split structure and includes a non-return base 101, a connecting nut 102 and a non-return guide portion 103; one end of the non-return base 101 is connected to the water outlet end of the drainage pump 200, and the other end thereof is formed with a positioning locking portion 3; one end of the non-return guide portion 103 is connected to the positioning locking portion 3 through the connecting nut 102, and the other end thereof is connected to the drainage pipe 300; the insides of the non-return base 101 and the non-return guide portion 103 are both formed with cavities and are interconnected to define a drainage passage 1.

[0060] In order to facilitate installation, the present invention can adopt a split structure. Before installation, the non-return ball is placed in the corresponding position, and the non-return base 101 and the non-return guide part 103 are connected into an integral structure through the connecting nut 102. Specifically, the non-return base 101 has a first passage 11, and the non-return guide part 103 has a second passage 12 and is provided with a plurality of guide protrusions 14.

[0061] As a preferred embodiment of the present invention, continue to refer to Figure 5 and Figure 6 One end of the positioning locking portion 3 is formed with an annular flange, and one end of the connecting nut 102 is formed with an annular clamping plate corresponding to the annular flange. The annular flange is located inside the connecting nut 102 and is limited by the annular clamping plate; the other end of the connecting nut 102 is correspondingly connected to the non-return guide portion 103, and the non-return guide portion 103 and the corresponding ends of the non-return base 101 are tightly pressed against each other.

[0062] It should be noted that as the connecting nut 102 and the non-return guide part 103 are tightened, the annular clamping plate and the lower end surface of the annular flange are pressed against each other, and the upper end surface of the annular flange and the corresponding end of the non-return guide part 103 are pressed against each other, thereby achieving a firm connection between the non-return base 101 and the non-return guide part 103.

[0063] As a preferred embodiment of the present invention, Fig. 9 and Fig.10 As shown, the noise reduction device body 100 adopts an integral structure; the end of the bypass 13 away from the second passage 12 is provided with an installation opening for installing a check ball, and the installation opening is detachably connected to a bypass cover 131. When the noise reduction device body 100 adopts an integral structure, the installer can install the check ball from the installation opening, specifically, by removing the bypass cover 131 and then installing the check ball.

[0064] As a preferred embodiment of the present invention, when the driving force of the water flow or air flow reaches a first preset value, the check ball moves a first distance accordingly and is located in the second channel 12, and the water flow or air flow is discharged through the gap; when the driving force of the water flow or air flow reaches a second preset value, the check ball moves a second distance accordingly and at least a part of it is located in the bypass 13, and the water flow or air flow is discharged through the second passage 12; and the first preset value is less than the second preset value.

[0065] It should be noted that when the guide protrusion 14 and the additional bypass 13 are set at the same time, the check ball can be pushed to different positions according to the water flow or air flow. Specifically, the inner wall of the second passage 12 between the connection between the bypass 13 and the second passage 12 and the positioning locking part 3 is provided with a guide protrusion 14. When the driving force of the water flow or air flow is greater than the first preset value and less than the second preset value, the check ball moves a first distance along the guide protrusion 14 under the push of the water flow or air flow, and the smaller water flow or air flow is discharged through the gap; when the driving force of the water flow or air flow is greater than the second preset value, the check ball moves to the bypass 13 position under the push of the air flow or water flow, and the water flow or air flow is discharged through the second passage 12; in the later stage of drainage, when the driving force of the water flow or air flow is less than the first preset value, the check ball returns to the position of contacting and blocking the positioning locking part 3 to avoid noise caused by water backflow in the drainage pipe; by moving the check ball to different positions according to the size of the water flow or air flow, the noise of the drainage pump can be reduced without affecting drainage.

[0066] As a preferred embodiment of the present invention, the noise reduction device body 100 further includes an elastic element, which is not shown in the drawings. The elastic element is used to provide elastic force to the anti-return ball; when the anti-return ball moves a first distance, the elastic element produces a first deformation; when the anti-return ball moves a second distance, the elastic element produces a second deformation. In a specific embodiment, the elastic element is a spring.

[0067] Those skilled in the art can understand that, when the anti-return ball moves, the elastic element produces different deformations accordingly, so that the elastic force applied to the anti-return ball by the elastic element is different. In a closed state, the resultant force of the elastic force applied to the anti-return ball by the elastic element and the gravity of the anti-return ball is a first preset value, and the size of the first preset value can be adjusted by adjusting the elastic force of the elastic element; when the anti-return ball can be moved to the bypass position, the resultant force of the elastic force applied to the anti-return ball by the elastic element and the gravity of the anti-return ball is a second preset value, and the size of the second preset value can also be adjusted by adjusting the elastic force of the elastic element. Therefore, the noise reduction device for a drainage pump of the present invention can be matched to occasions with different drainage conditions, thereby expanding the scope of application.

[0068] The embodiment of the present invention further provides a drainage pump, comprising the above-mentioned noise reduction device for the drainage pump; and the above-mentioned noise reduction device is installed at the water outlet of the drainage pump 200.

[0069] The embodiment of the present invention also provides a washing and protecting device, such as Fig.13 and Fig.14 As shown, the washing and care device 400 includes a drain pipe 300 and a drain pump 200, and the water outlet end of the drain pump 200 is provided with the above-mentioned noise reduction device for the drain pump; and the noise reduction device is respectively integrally connected to the drain pump 200 and the drain pipe 300 or detachably connected.

[0070] It should be noted that the noise reduction device is threadedly connected to the drain pump 200 and the drain pipe 300; or the corresponding parts of the noise reduction device are integrally connected to the drain pump 200 and the drain pipe 300 respectively; in a specific embodiment, the non-return base 101 of the noise reduction device is threadedly connected or integrally connected to the drain pump 200, and the non-return guide part 103 of the noise reduction device is threadedly connected or integrally connected to the drain pipe 300.

[0071] Example 1

[0072] like Figure 1-Figure 6 As shown, the noise reduction device for a drainage pump in this embodiment is suitable for occasions where a relatively small water flow or air flow is discharged.

[0073] The noise reduction device body 100 of this embodiment adopts a split structure, including a non-return base 101 and a non-return guide portion 103, the non-return base 101 and the non-return guide portion 103 are connected and fastened by a connecting nut 102, and a drainage passage 1 is defined inside, wherein the non-return base 101 is correspondingly connected to the water outlet of the drainage pump 200, and the non-return guide portion 103 is correspondingly connected to the drainage pipe 300;

[0074] A plurality of guide protrusions 14 are formed on the inner wall of the non-return guide portion 103; when drainage is not in progress, the non-return ball contacts the positioning locking portion 3 to block the drainage passage 1; when drainage is in progress, the water flow or air flow pushes the non-return ball to slide along the guide protrusions 14, and at this time the water flow or air flow can be discharged through the groove gaps between adjacent guide protrusions 14; in the later stage of drainage, the non-return ball can quickly return to the position of contact and blocking with the positioning locking portion 3 under the action of its own gravity and / or elastic force, so as to avoid the water backflow in the drainage pipe 300 and generate noise.

[0075] Example 2

[0076] like Figure 8-Figure 10 As shown, the noise reduction device for a drainage pump in this embodiment is suitable for occasions where a relatively large water flow or air flow is discharged.

[0077] The main body 100 of the noise reduction device of this embodiment adopts an integral structure, and the check ball is installed from the installation port of the bypass 13 to the drainage passage 1; when draining, the water flow or air flow pushes the check ball to move to the bypass 13, and at this time the water flow or air flow is discharged through the second passage 12; in the later stage of drainage, the check ball returns to the position of contacting and blocking with the positioning locking part 3 under the action of its own gravity and / or elastic force, thereby reducing the noise generated by the water backflow in the drainage pipe 300 without affecting the drainage blockage pipeline.

[0078] Example 3

[0079] like Fig.11 and Fig.12 As shown, the noise reduction device for a drainage pump of this embodiment is suitable for occasions where the discharge volume of water flow or air flow is unstable.

[0080] The bypass 13 of this embodiment is connected to the second passage 12, and the second passage 12 is provided with a plurality of guide protrusions 14 on the inner wall between the connection position and the positioning locking portion 3;

[0081] When a small water flow or air flow is discharged, the check ball moves along the guide protrusion 14 in the second passage 12, and the smaller water flow or air flow is discharged through the gap; when a large water flow or air flow is discharged, the check ball can move to the bypass 13 position, and the larger water flow or air flow is discharged through the second passage 12; thus, this embodiment can move to different positions according to the size of the water flow or air flow, can achieve rapid recovery and reduce noise without affecting drainage.

[0082] It should be noted that the above implementation mode is only used to illustrate the principles of the present invention and is not intended to limit the scope of protection of the present invention. Without departing from the principles of the present invention, those skilled in the art can adjust the above method so that the present invention can be applied to more specific application scenarios.

[0083] For example, in an alternative embodiment, the guide protrusion 14 of the present invention may extend along the axial direction of the second passage 12, and may also extend in a spiral shape.

[0084] For example, in an alternative embodiment, in the present invention, as the guide protrusions 14 extend, the gaps between adjacent guide protrusions 14 gradually increase.

[0085] For example, in an alternative embodiment, the washing and care device 400 of the present invention includes a washing machine, a dishwasher, or a care machine.

[0086] For example, in an alternative embodiment, the anti-return movable member 2 of the present invention may also be a cone or a cylinder or a structure with an elliptical cross-section.

[0087] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A noise reduction device for a drainage pump, characterized in that: The noise reduction device comprises a main body (100), wherein the main body (100) has a drainage passage (1) in communication with a drainage pump (200), and a backflow prevention movable part (2) is arranged in the drainage passage (1); In the open state, the anti-return movable part (2) moves a corresponding distance along the drainage passage (1) as the driving force of the water flow or air flow changes, and the drainage passage (1) is opened; in the closed state, the anti-return movable part (2) returns to the position of blocking the drainage passage (1).

2. The noise reduction device for a drainage pump according to claim 1, characterized in that: A positioning locking portion (3) is provided in the drainage passage (1), and the positioning locking portion (3) divides the drainage passage into a first passage (11) and a second passage (12); the first passage (11) is connected to the drainage pump (200), and the anti-return movable member (2) is located in the second passage (12); In the open state, the anti-return movable part (2) moves a corresponding distance along the second passage (12) as the driving force of the water flow or air flow changes, and the first passage (11) is connected to the second passage (12); in the closed state, the anti-return movable part (2) returns to the position of the positioning locking part (3) to block the drainage passage (1).

3. The noise reduction device for a drainage pump according to claim 2, characterized in that: The anti-return movable part (2) is an anti-return ball; in the open state, the anti-return ball moves a corresponding distance along the second passage (12) as the driving force of the water flow or air flow changes; A gap for water flow or air flow to pass through is formed between the inner wall of the second passage (12) and the outer wall of the check ball.

4. The noise reduction device for a drainage pump according to claim 2 or 3, characterized in that: The drainage passage (1) further comprises a bypass passage (13) communicating with the second passage (12); In the open state, the check ball moves a corresponding distance as the driving force of the water flow or air flow changes, at least a portion of the check ball is located in the bypass (13), and the second passage (12) is connected to the first passage (11); In the closed state, the non-return ball returns from the bypass (13) to the position of the positioning locking portion (3) to block the drainage passage (1).

5. The noise reduction device for a drainage pump according to claim 2, characterized in that: The noise reduction device body (100) adopts a split structure and comprises a non-return base (101), a connecting nut (102) and a non-return guide part (103); One end of the non-return base (101) is connected to the water outlet end of the drainage pump (200), and the other end thereof is formed with the positioning locking portion (3); one end of the non-return guide portion (103) is connected to the positioning locking portion (3) via the connecting nut (102), and the other end thereof is connected to the drainage pipe (300); The anti-return base (101) and the anti-return guide portion (103) are both formed with cavities inside and are interconnected to define the drainage passage (1).

6. The noise reduction device for a drainage pump according to claim 4, characterized in that: The noise reduction device body (100) adopts an integral structure; An end of the bypass (13) away from the second passage (12) is provided with a mounting opening for mounting the non-return ball, and the mounting opening is detachably connected to a bypass cover (131).

7. The noise reduction device for a drainage pump according to claim 4, characterized in that: When the driving force of the water flow or air flow reaches a first preset value, the anti-return ball moves a first distance accordingly and is located in the second passage (12), and the water flow or air flow is discharged through the gap; When the driving force of the water flow or air flow reaches a second preset value, the check ball moves a corresponding second distance and at least a portion of it is located in the bypass (13), and the water flow or air flow is discharged through the second passage (12); And the first preset value is smaller than the second preset value.

8. The noise reduction device for a drainage pump according to claim 7, characterized in that: The noise reduction device body (100) further comprises an elastic element, and the elastic element is used to provide elastic force to the anti-return ball; When the anti-return ball moves a first distance, the elastic element generates a first deformation; when the anti-return ball moves a second distance, the elastic element generates a second deformation.

9. A drainage pump, characterized in that: A noise reduction device for a drainage pump comprising any one of claims 1 to 8.

10. A washing and care device, characterized in that: It comprises a drainage pump (200), a water outlet end of the drainage pump (200) being provided with a noise reduction device for a drainage pump as claimed in any one of claims 1 to 8.

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