Rear cover for peristaltic pump, peristaltic pump and dish washing machine

Abstract

The utility model discloses a rear cover for a peristaltic pump, the peristaltic pump and a dish-washing machine. The rear cover comprises a cavity which is composed of a bottom plate and side walls and used for containing a roller disc assembly in the peristaltic pump. An oil storage groove and a liquid storage groove are formed in the end, facing the cavity, of the bottom plate, the oil storage groove is in clearance fit with a rotating shaft of the roller disc assembly, and the inner bottom face of the oil storage groove and the inner bottom face of the liquid storage groove are lower than the inner bottom face of the bottom plate; the liquid storage tank and the oil storage tank are separated through an annular column. A shaft hole in a traditional rear cover is improved into the counter bore type oil storage tank, the roller disc assembly drives oil to lubricate when rotating, abrasion of an annular column is avoided, meanwhile, the liquid storage tank is additionally arranged, overflowing liquid can enter the liquid storage tank and is prevented from flowing to the outer portion of the rear cover to cause pollution to the working environment, and the service life of the peristaltic pump is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of design of a liquid adding device for a dishwasher, in particular to a rear cover for a peristaltic pump, a peristaltic pump and a dishwasher. Background Art

[0002] With the continuous development of science and technology, people's requirements for living standards are getting higher and higher. The application of dishwashers has greatly facilitated the dishwashing work in homes and commercial places, saved time and labor costs, and improved washing efficiency. Therefore, dishwashers are becoming more and more popular and eventually become a must-have appliance for every household. There are many types of dishwashers on the market, mainly including desktop, free-standing, embedded, sink and integrated types. In terms of the way of adding detergent, it is generally manual addition. In order to pursue high-quality life and save time, automatic detergent addition will gradually replace manual detergent addition.

[0003] In the existing automatic liquid adding peristaltic pump technology solutions: Figure 1 As shown, the rear cover 1 of the peristaltic pump is fitted with the roller disc assembly through the shaft hole 2. For ease of processing, the shaft hole 2 is through the rear cover. When the peristaltic pump is running for a long time or under abnormal operating conditions, the hose will rupture, and the liquid will flow out from the shaft hole 2 of the rear cover to pollute the environment. Secondly, after the hose ruptures, the liquid cannot be transported to the designated area, resulting in the failure of the peristaltic pump. In addition, when the roller disc assembly is running for a long time, the roller boss rubs against the shaft hole of the rear cover, causing the shaft hole to wear, deform and enlarge, and it cannot play the role of circumferential fixation, and finally causes the pump assembly to fail. Utility Model Content

[0004] In order to solve the technical problems of the existing peristaltic pump that liquid may flow out from the shaft hole of the back cover and pollute the environment or the peristaltic pump may fail, the utility model provides a back cover for a peristaltic pump, a peristaltic pump and a dishwasher to solve the above problems.

[0005] The utility model proposes a back cover for a peristaltic pump, wherein the back cover is composed of a bottom plate and side walls to form a cavity for accommodating a roller disk assembly in the peristaltic pump; an end of the bottom plate facing the cavity is provided with an oil storage tank and a liquid storage tank, the oil storage tank is clearance-matched with a rotating shaft of the roller disk assembly, the inner bottom surface heights of the oil storage tank and the liquid storage tank are lower than the inner bottom surface height of the bottom plate; the liquid storage tank and the oil storage tank are separated by an annular column.

[0006] Furthermore, the liquid storage tank is an annular groove coaxially arranged with the oil storage tank.

[0007] Furthermore, the outer wall surface of the liquid storage tank has a plurality of reinforcing ribs connected to the annular column.

[0008] Furthermore, the top height of the reinforcing rib is lower than the inner bottom surface height of the bottom plate.

[0009] Furthermore, the side wall of the rear cover that extrude the hose together with the roller disk assembly is an arc-shaped wall surface, and the outer diameter of the liquid storage tank is smaller than or equal to the inner diameter of the arc-shaped wall surface.

[0010] Furthermore, the top of the annular column has a boss in contact with the lower plane of the roller disk assembly, and the cross-sectional area of ​​the boss is smaller than the cross-sectional area of ​​the annular column.

[0011] Furthermore, the inner bottom surface height of the oil storage tank is lower than the lower surface height of the rotating shaft of the roller disk assembly, thereby forming an oil storage cavity between the height gap between the oil storage tank and the rotating shaft.

[0012] The utility model also proposes a peristaltic pump, including a roller disk assembly, a motor assembly 6, a hose, a front cover and the above-mentioned rear cover for the peristaltic pump, the front cover and the rear cover cover each other, the motor assembly 6 drives the roller disk assembly to rotate, and the hose is clamped between the roller disk assembly and the side wall of the rear cover.

[0013] Furthermore, the roller disk assembly includes a roller disk, a roller and a roller shaft. The center of the roller disk has a flat groove that cooperates with the motor shaft. The roller sleeve is arranged on the roller shaft. The outer edge of the roller disk is provided with an open groove and a matching hole that are connected in sequence. The roller shaft passes through the open groove and cooperates with the matching hole. The opening width of the open groove is smaller than the diameter of the matching hole and the roller shaft.

[0014] Furthermore, the opening width of the open slot gradually increases from an end connected to the matching hole to an end away from the matching hole.

[0015] The utility model also provides a dishwasher, comprising the peristaltic pump mentioned above.

[0016] The beneficial effects of the utility model are:

[0017] (1) The utility model improves the shaft hole on the traditional rear cover into an oil storage tank in the form of a countersunk hole. When the roller disk assembly rotates, it drives the oil lubrication to avoid wear of the annular column. At the same time, a liquid storage tank is added, and the overflowed liquid can enter the liquid storage tank to avoid flowing to the outside of the rear cover to cause pollution to the working environment, thereby increasing the service life of the peristaltic pump.

[0018] (2) The utility model provides a boss with a smaller cross-sectional area on the top of the annular column, thereby reducing the contact area between the annular column and the roller disk assembly and reducing wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1 It is a schematic diagram of the structure of the back cover in the prior art;

[0021] Figure 2It is an exploded view of a specific implementation of the peristaltic pump described in the utility model;

[0022] Figure 3 It is a three-dimensional diagram of the rear cover for the peristaltic pump described in the utility model;

[0023] Figure 4 It is a cross-sectional view of the rear cover for the peristaltic pump described in the utility model;

[0024] Figure 5 It is a stereoscopic diagram of the roller disc assembly in the peristaltic pump of the utility model;

[0025] Figure 6 It is an axial cross-sectional view of a specific embodiment of the peristaltic pump described in the utility model;

[0026] Figure 7 This is a schematic diagram of the interior of the peristaltic pump described in the utility model;

[0027] Figure 8 It is an exploded view of the roller disc assembly in the peristaltic pump of the utility model;

[0028] Fig. 9 It is an axial cross-sectional view of a specific implementation of the peristaltic pump described in the utility model.

[0029] In the figure, 1, rear cover, 2, shaft hole, 3, bottom plate, 4, side wall, 5, cavity, 6, motor assembly, 7, roller disk assembly, 701, roller disk, 702, roller, 703, roller shaft, 8, hose, 9, front cover, 10, sleeve, 11, oil storage tank, 12, liquid storage tank, 13, annular column, 14, convex column, 15, arc-shaped wall, 16, reinforcing rib, 17, oil storage cavity, 18, boss, 19, rotating shaft, 20, lower plane, 21, flat groove, 22, open groove, 23, matching hole, 24, upper plate, 25, lower plate. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0031] The peristaltic pump for the dishwasher filling device usually includes a motor assembly 6, a roller disk assembly 7, a hose 8, a front cover 9 and a rear cover 1. The motor assembly 6 is used to drive the normal operation of the peristaltic pump. The roller disk assembly 7 is used to provide a carrier for compressing the hose 8. The hose 8 provides a medium for the flow of the detergent medium. The front cover 9 is used to fix the rear cover 1 and serve as a carrier fixed to the upper computer. The rear cover 1 provides space for the installation of the hose 8. The front cover 9 and the rear cover 1 cover each other, and the motor shaft of the motor assembly 6 is matched with the circumferential limit of the roller disk assembly 7 to drive the roller disk assembly 7 to rotate, and the hose 8 is clamped between the roller disk assembly and the side wall 4 of the rear cover 1. As shown in FIG. Figure 2 It is a schematic diagram of the peristaltic pump structure. After the peristaltic pump is installed, it is assembled on the dishwasher. The inlet of the hose 8 is connected to the sleeve 10. The head of the sleeve 10 is a needle with a hole. When the liquid storage bag on the dishwasher is installed, the sleeve 10 will pierce the liquid storage bag, and the liquid will flow through the sleeve 10. When the motor operates normally, it drives the roller disk assembly 7 to operate, thereby forming a pressure difference in the hose 8, and the liquid is transported under the action of the pressure difference.

[0032] The utility model mainly improves the rear cover 1 to solve the problem that the shaft hole of the rear cover 1 is easy to wear and the overflowed liquid is easy to leak in the traditional structure. The specific improvements are as follows:

[0033] like Figure 3-Figure 6 As shown, a back cover for a peristaltic pump, the back cover 1 is composed of a bottom plate 3 and a side wall 4 to form a cavity 5 for accommodating a roller disk assembly 7 in the peristaltic pump; the roller disk assembly 7 is arranged near the left end of the cavity 5, and the side wall 4 on the back cover 1 that extrude the hose 8 together with the roller disk assembly 7 is an arc-shaped wall surface 15, and the end of the bottom plate 3 connected to the arc-shaped wall surface 15 is also correspondingly an arc-shaped structure, and the end of the bottom plate 3 facing the cavity 5 is provided with an oil storage tank 11 and a liquid storage tank 12, and the oil storage tank 11 is clearance-matched with the rotating shaft 19 of the roller disk assembly 7, and the rotating shaft 19 refers to the shaft that cooperates with the motor assembly 6 and is the rotation center of the roller disk assembly 7, and the inner bottom surface heights of the oil storage tank 11 and the liquid storage tank 12 are lower than the inner bottom surface height of the bottom plate 3; the liquid storage tank 12 and the oil storage tank 11 are separated by an annular column 13.

[0034] Function of the oil storage tank 11: The roller disc assembly 7 is a moving part, and the rear cover 1 is a stationary part. When the roller disc assembly 7 is running, the boss 14 at the bottom of the rotating shaft 19 cooperates with the oil storage tank 11, which plays a circumferential fixing role on the one hand, and the boss 14 contacts with grease to play a lubricating role on the other hand. The annular column 13 is a circular ring structure with a clearance fit with the boss 14, so the oil storage tank 11 is circular, and the roller disc assembly 7 drives the oil lubrication when rotating. The clearance between the oil storage tank 11 and the rotating shaft 19 of the roller disc assembly 7 is small, which ensures the normal rotation of the roller disc assembly 7, and also prevents the overflowing liquid from entering the oil storage tank 11.

[0035] When the depth of the oil storage tank 11 is low, the grease can be located between the radial gap between the oil storage tank 11 and the boss 14. Preferably, the inner bottom surface height of the oil storage tank 11 is lower than the lower surface height of the rotating shaft 19 of the roller disk assembly 7, so that an oil storage cavity 17 is formed between the height gap between the oil storage tank 11 and the rotating shaft 19. Figure 6 and Figure 7 As shown, by increasing the depth of the oil storage groove 11, an oil storage cavity 17 is formed below the protruding column 14, thereby increasing the oil storage capacity and improving the wear resistance.

[0036] Function of the liquid storage tank 12: Since the inner bottom surface of the liquid storage tank 12 is relatively low, when the hose 8 is broken, the transported medium will overflow and flow into the liquid storage tank 12 with a relatively low height, thereby preventing the medium from flowing out of the rear cover 1 and polluting the environment. The annular column 13 separates the oil storage tank 11 from the liquid storage tank 12, and the medium will not enter the oil storage tank 11.

[0037] The liquid storage tank 12 is preferably located outside the oil storage tank 11. Since the oil storage tank 11 is opposite to the rotation center of the roller disk assembly 7, the liquid storage tank 12 is located directly below the roller disk assembly 7. When the hose 8 squeezed by the roller disk assembly 7 is broken, the medium can directly drip into the liquid storage tank 12.

[0038] The liquid storage tank 12 may be square, circular or other irregular shapes. To ensure structural symmetry and reduce structural edges and corners, the liquid storage tank 12 is preferably designed as an annular groove coaxially arranged with the oil storage tank 11. The arc wall 15 is preferably coaxial with the liquid storage tank 12 and the oil storage tank 11. The outer diameter of the liquid storage tank 12 may be equal to the inner diameter of the arc wall 15 (e.g. Fig. 9 As shown), it can also be smaller than the inner diameter of the arc wall 15 (as shown Figure 6 as shown).

[0039] In order to enhance the support strength, in further design, such as Figure 3 As shown, the outer wall surface of the liquid storage tank 12 has a plurality of reinforcing ribs 16 connected to the annular column 13, that is, the reinforcing ribs 16 divide the liquid storage tank 12 into multiple parts, and the height of the reinforcing ribs 16 is preferably less than the depth of the liquid storage tank 12, that is, the top height of the reinforcing ribs 16 is lower than the inner bottom surface height of the bottom plate 3, so as to avoid interference between the reinforcing ribs 16 and the roller disk assembly 7, so that the entire liquid storage tank 12 can be filled when there is a lot of residual liquid.

[0040] In order to solve the problem that the inner diameter of the annular column 13 increases due to long-term friction between the end surface contact portion of the annular column 13 and the rotating shaft 19, the present invention makes the following improvements on the basis of the above-mentioned rear cover 1 structure:

[0041] like Figure 3As shown, the top of the annular column 13 has a boss 18 in contact with the lower plane 20 of the roller disk assembly 7, and the cross-sectional area of ​​the boss 18 is smaller than the cross-sectional area of ​​the annular column 13. The main function is to reduce the contact area between the roller disk assembly 7 and the annular column 13, thereby reducing friction.

[0042] Roller plate assembly 7:

[0043] like Figure 5-Figure 8 As shown, the roller disk assembly 7 includes a roller disk 701, a roller 702 and a roller shaft 703. The center of the roller disk 701 has a flat groove 21 that cooperates with the motor shaft. The flat groove 21 is circumferentially fixed to the motor shaft. The roller 702 is sleeved on the roller shaft 703. The outer edge of the roller disk 701 is provided with an open groove 22 and a matching hole 23 that are connected in sequence. The roller shaft 703 passes through the open groove 22 and cooperates with the matching hole 23. The opening width of the open groove 22 is smaller than the diameter of the matching hole 23 and the roller shaft 703.

[0044] The roller plate 701 can be formed by the upper plate 24 and the lower plate 25 which are separately arranged, and multiple parts need to be assembled to form the roller plate 701. The roller plate 701 of this structural form is the prior art and will not be described here. The roller plate 701 of the utility model is preferably an integral structure, such as Figure 7 and Figure 8 As shown, the center of the roller disc 701 is the rotating shaft 19, and the outer periphery is the upper disc 24 and the lower disc 25 connected to each other, and both sides of the upper disc 24 and the lower disc 25 are provided with an opening groove 22 and a matching hole 23. The integral roller disc 701 reduces the intermediate connecting parts of the sleeve, improves the coaxiality of the motor shaft and the roller disc 701, reduces vibration and noise during transmission, reduces the vibration of the roller disc 701, and ensures the consistency of the compression hose 8, thereby improving the life of the hose 8.

[0045] After the roller disc assembly 7 is installed, the distance between the two roller shafts 703 can be fine-tuned. When the motor is running, the compression ratio can be adjusted according to the hardness and tolerance of the hose 8, which can ensure the normal operation of the motor and extend the life of the peristaltic pump. The compression ratio refers to the ratio of the hose 8 between the rear cover 1 and the roller 702 before and after compression. The larger the distance between the roller 702 and the rear cover 1, the smaller the compression of the hose 8, so the smaller the deformation of the hose 8, and the longer the service life of the hose 8. Preferably, the opening width of the opening slot 22 gradually increases from the end connected to the matching hole 23 to the end away from the matching hole 23, so that the installation of the roller shaft 703 is more convenient.

[0046] In the description of the present invention, it is necessary to understand that the terms "center", "width", "thickness", "up", "down", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0047] In addition, in the description of the present invention, unless otherwise specified, “several” means two or more.

[0048] In this specification, the schematic representation of the terms does not necessarily refer to the same embodiment. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in one or more embodiments.

[0049] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A back cover for a peristaltic pump, characterized in that: The rear cover (1) is composed of a bottom plate (3) and a side wall (4) to form a cavity (5) for accommodating a roller disk assembly (7) in a peristaltic pump; the bottom plate (3) has an oil storage tank (11) and a liquid storage tank (12) at one end facing the cavity (5); the oil storage tank (11) and the rotating shaft (19) of the roller disk assembly (7) are clearance-matched; the inner bottom surfaces of the oil storage tank (11) and the liquid storage tank (12) are lower than the inner bottom surface of the bottom plate (3); the liquid storage tank (12) and the oil storage tank (11) are separated by an annular column (13).

2. The back cover for a peristaltic pump according to claim 1, characterized in that: The liquid storage tank (12) is an annular tank coaxially arranged with the oil storage tank (11).

3. The back cover for a peristaltic pump according to claim 1, characterized in that: The outer wall surface of the liquid storage tank (12) has a plurality of reinforcing ribs (16) connected to the annular column (13).

4. The back cover for a peristaltic pump according to claim 3, characterized in that: The top height of the reinforcing rib (16) is lower than the inner bottom surface height of the bottom plate (3).

5. The back cover for a peristaltic pump according to claim 2, characterized in that: A side wall (4) on one side of the rear cover (1) that co-extrudes the hose (8) with the roller disc assembly (7) is an arc-shaped wall surface (15), and an outer diameter of the liquid storage tank (12) is smaller than or equal to an inner diameter of the arc-shaped wall surface (15).

6. The back cover for a peristaltic pump according to claim 1, characterized in that: The top of the annular column (13) has a boss (18) in contact with the lower plane (20) of the roller disc assembly (7), and the cross-sectional area of ​​the boss (18) is smaller than the cross-sectional area of ​​the annular column (13).

7. The back cover for a peristaltic pump according to claim 1, characterized in that: The inner bottom surface of the oil storage groove (11) is lower than the lower surface height of the rotating shaft (19) of the roller disk assembly (7), thereby forming an oil storage cavity (17) between the height gap between the oil storage groove (11) and the rotating shaft (19).

8. A peristaltic pump, characterized in that: The peristaltic pump comprises a roller disk assembly (7), a motor assembly (6), a hose (8), a front cover (9) and a rear cover for a peristaltic pump according to any one of claims 1 to 7, wherein the front cover (9) and the rear cover (1) overlap each other, the motor assembly 6 drives the roller disk assembly (7) to rotate, and the hose (8) is clamped between the roller disk assembly (7) and the side wall (4) of the rear cover (1).

9. The peristaltic pump according to claim 8, characterized in that: The roller disc assembly (7) comprises a roller disc (701), a roller (702) and a roller shaft (703); the centre of the roller disc (701) comprises a flat groove (21) which cooperates with the motor shaft; the roller (702) is sleeved on the roller shaft (703); the outer edge of the roller disc (701) is provided with an open groove (22) and a matching hole (23) which are connected in sequence; the roller shaft (703) passes through the open groove (22) and cooperates with the matching hole (23); the opening width of the open groove (22) is smaller than the diameters of the matching hole (23) and the roller shaft (703).

10. The peristaltic pump according to claim 9, characterized in that: The opening width of the opening slot (22) gradually increases from an end connected to the matching hole (23) to an end away from the matching hole (23).

11. A dishwasher, characterized in that: Comprising the peristaltic pump described in any one of claims 8-10.

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