Diaphragm pump

Abstract

The utility model discloses a diaphragm pump which comprises a pump chamber module, a diaphragm assembly and an eccentric power assembly. The pump chamber module is provided with a plurality of liquid transfer cavities, the diaphragm assembly and the liquid transfer cavities are arranged in a sealed mode, the diaphragm assembly comprises deformation structures corresponding to the liquid transfer cavities and sealing structures arranged on the peripheries of the deformation structures, a sealing ring groove is formed in the end face of the pump chamber, and each sealing structure comprises a sealing convex ring. The surface of the sealing convex ring comprises a first sealing face and a first receding part, the side wall of the sealing ring groove comprises a second sealing face and a second receding part, the first sealing face and the second sealing face are sealed in an attached mode, the second receding part is located at an opening of the sealing ring groove, and the first receding part and the second receding part are arranged in a spaced mode to form a receding gap. Contact friction between the sealing convex ring and the end face of the pump chamber is reduced, the probability of powder falling caused by friction is reduced, and material liquid pollution is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to pump body technical field, especially a diaphragm pump. BACKGROUND

[0002] The utility model discloses a diaphragm pump in prior art patent CN202326123U, including mutually cooperate and form the chamber's pump front cavity and pump rear cavity, motor, eccentric shaft, bevel wheel and diaphragm array, when the bevel of the bevel wheel corresponding to the diaphragm of point A moves from its earlier position to the position of later, the axial distance between diaphragm and inlet check valve increases, and the chamber between both produces suction, thereby liquid flows from the fixed column side of inlet check valve to the side of valve sheet, carries out the main liquid suction action, and a small amount of suction or a small amount of repulsion is produced between the diaphragm of adjacent and inlet check valve or liquid outlet check valve, and a large amount of repulsion is produced between the diaphragm of relative and liquid outlet check valve, carries out the main liquid discharge action, thereby, motor every week, four diaphragms also rotate each execution liquid's suction and liquid's press out operation once.

[0003] The outer edge of the diaphragm in the above patent is installed in the adaptive annular groove through the spherical annular sealing convex ring and is clamped by the pump rear cavity and the cavity inner mounting piece to realize sealing, and the center of the diaphragm is fixedly connected with the bevel wheel. However, the diaphragm will be deformed by pulling in the working process and contact and rub with the pump rear cavity and the cavity inner mounting piece, and in order to ensure the deformation ability of the diaphragm, the mechanical strength of the diaphragm will not be high, and the particles produced by the abrasion of the diaphragm after frequent rubbing will enter the liquid rotating cavity, and then pollute the liquid. UTILITY MODEL CONTENTS

[0004] In view of the defects in the prior art, the utility model aims at providing a diaphragm pump, which solves the problem that the particles produced by the abrasion of the diaphragm after frequent rubbing pollute the liquid in the prior art diaphragm pump.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] A diaphragm pump, comprising a pump chamber module, a diaphragm assembly and an eccentric power assembly;

[0007] The pump chamber module comprises a pump front cavity, a pump chamber and a pump rear cavity, the pump front cavity comprises a liquid inlet and a liquid outlet, the pump chamber is assembled between the pump front cavity and the pump rear cavity and is sealed with the pump front cavity to form a liquid inlet chamber communicated with the liquid inlet and a liquid outlet chamber communicated with the liquid outlet;

[0008] The pump chamber module has a plurality of liquid rotating cavities, a liquid inlet check valve is arranged between the liquid inlet chamber and the liquid rotating cavity, and a liquid outlet check valve is arranged between the liquid rotating cavity and the liquid outlet chamber;

[0009] The diaphragm assembly is respectively sealed with each of the rotating liquid cavities, the eccentric power assembly is in transmission connection with the diaphragm assembly, the distance between the diaphragm assembly and the liquid inlet one-way valve in each of the rotating liquid cavities is changed alternately, so that each of the rotating liquid cavities is alternately communicated with the liquid inlet cavity to realize liquid suction or alternately communicated with the liquid outlet cavity to realize liquid discharge;

[0010] The diaphragm assembly comprises a deformation structure corresponding to each of the rotating liquid cavities and a sealing structure arranged at the outer periphery of the deformation structure, the deformation structure has an inner surface facing the rotating liquid cavity and an outer surface away from the rotating liquid cavity;

[0011] The end surface of the pump chamber is provided with a sealing ring groove, the sealing structure comprises a sealing convex ring, the sealing structure is clamped by the pump rear cavity and the pump chamber, and the sealing convex ring is embedded in the sealing ring groove to realize sealing cooperation;

[0012] The surface of the sealing convex ring comprises a first sealing surface and a first avoiding part, the sidewall of the sealing ring groove comprises a second sealing surface and a second avoiding part, the first sealing surface is in close sealing with the second sealing surface, the second avoiding part is located at the opening of the sealing ring groove, and the first avoiding part is arranged in space from the second avoiding part to form an avoiding gap.

[0013] The diaphragm pump provided by the utility model, the diaphragm assembly is correspondingly sealed with the rotating liquid cavity, the volume of the rotating liquid cavity is changed through the deformation of the deformation structure, and the rotating liquid cavity is sealed by using the sealing structure, when the deformation structure deforms, the sealing structure is pulled to make it rub against the pump rear cavity and the pump chamber to remove powder, especially the surface of the sealing convex ring in the sealing structure faces the rotating liquid cavity, if the powder is removed by rubbing, the powder will enter the rotating liquid cavity to pollute the liquid, therefore, the surface of the sealing convex ring comprises a first sealing surface and a first avoiding part, the sidewall of the sealing ring groove comprises a second sealing surface and a second avoiding part, the first sealing surface and the second sealing surface are matched to realize the sealing of the rotating liquid cavity, the first avoiding part and the second avoiding part form an avoiding gap, so that the sealing convex ring and the sealing ring groove are not in contact and not rubbed at the opening of the side close to the rotating liquid cavity in the state of not being forced, and in the working process of the diaphragm pump, the sealing convex ring is pulled by the deformation structure, and the avoiding gap also serves as a deformation space, so that the contact and rubbing between the sealing convex ring and the end surface of the pump chamber are reduced, the probability of removing powder by rubbing is reduced, and the liquid is prevented from being polluted.

[0014] Preferably, the first avoiding part is connected with the first sealing surface and the inner surface of the deformation structure, the second avoiding part is connected with the second sealing surface and the end surface of the pump chamber located at the outer periphery of the sealing ring groove, and the inner surface of the deformation structure is arranged in space from the end surface of the pump chamber; therefore, the avoiding gap is communicated with the rotating liquid cavity, so that the first avoiding part of the sealing structure and the inner surface of the deformation structure of the diaphragm assembly are kept in space from the end surface of the pump chamber, and are not contacted and rubbed as much as possible, the probability of removing powder by rubbing is further reduced, and the liquid is prevented from being polluted.

[0015] Preferably, the first avoiding part is an arc surface, and the second avoiding part is an arc surface. On the one hand, the stress concentration of the sealing convex ring and the sealing ring groove can be reduced, the strength and durability can be improved, and the risk of fatigue cracks can be effectively reduced. On the other hand, the sealing convex ring is pulled by the deformation structure. If the first avoiding part inevitably contacts the second avoiding part, the arc surface can more evenly distribute the pressure than the plane, thereby reducing the pressure per unit area and reducing wear.

[0016] Preferably, the center of the arc surface of the first avoiding part and the center of the arc surface of the second avoiding part are located on the same side of the avoiding gap, and the corresponding radius of the arc surface of the first avoiding part is smaller than the corresponding radius of the arc surface of the second avoiding part. Thus, the avoiding gap formed by the first avoiding part and the second avoiding part is larger, and the first avoiding part and the second avoiding part do not completely fit even if they contact, the contact area is smaller, the wear area is smaller, and the probability of powder loss due to wear is reduced.

[0017] Preferably, the starting end of the second avoiding part is in contact with the first sealing surface, and the size of the avoiding gap tends to increase from the starting end of the second avoiding part to the end of the second avoiding part. Based on the positions of the first avoiding part and the second avoiding part, the size of the avoiding gap tends to increase from the side far from the rotating liquid cavity to the side close to the rotating liquid cavity. On the one hand, the farther from the rotating liquid cavity, the smaller the pulling force on the sealing convex ring, the smaller the deformation, and the smaller the size of the avoiding gap on this side, which can ensure the sealing performance of the sealing convex ring and the sealing ring groove. On the other hand, the closer to the rotating liquid cavity, the greater the pulling force on the sealing convex ring, the greater the size of the avoiding gap on this side, and enough space is provided to enable the sealing structure to overcome the pulling of the deformation structure and not to contact and rub with the opening of the sealing ring groove and the end surface of the pump chamber.

[0018] Preferably, the sealing convex ring comprises a straight section and a circular arc section, the first sealing surface is formed by the outer surfaces of the straight section and the circular arc section, the straight section and the circular arc section are in sealing fit with the groove wall of the sealing ring groove, the sealing performance of the sealing convex ring and the sealing ring groove is ensured, and the starting end of the second avoiding part is connected with the outer surface of the straight section. Thus, a small amount of straight section close to the rotating liquid cavity is also spaced apart from the second avoiding part, further reducing the probability of friction between the sealing structure and the sealing ring groove.

[0019] Preferably, one side of the sealing structure in the axial direction is the sealing convex ring, and the other side in the axial direction is a pressure receiving part. The pump rear cavity has a pressing part corresponding to the pressure receiving part and used for pressing the sealing convex ring. The pressure receiving part is in pressing contact with the pressing part to form a pressing surface. The axial projection of the end of the pressing surface close to the deformation structure is located in the avoiding gap, and the axial projection of the pressing surface covers the sealing convex ring.

[0020] In this way, the extrusion part and the pressure receiving part cooperate to press the sealing protruding ring on the other side of the axial direction in the sealing ring groove, and the position of the extrusion part and the pressure receiving part affects the sealing performance of the sealing protruding ring and the sealing ring groove and the size of the avoidance gap between the first avoidance part and the second avoidance part. If the axial projection of the extrusion surface close to one end of the deformation structure is relatively close to the rotating liquid cavity and not in the avoidance gap, the axial force applied by the extrusion part can completely cover the sealing protruding ring, but the avoidance gap between the first avoidance part and the second avoidance part is reduced, and the deformation of the deformation structure away from the rotating liquid cavity is hindered. If the axial projection of the extrusion surface close to one end of the deformation structure is relatively far away from the rotating liquid cavity and not in the avoidance gap, the axial force applied by the extrusion part will not reduce the avoidance gap and will not affect the deformation of the deformation structure away from the rotating liquid cavity, but it cannot completely cover the sealing protruding ring, and the extrusion sealing effect of the sealing protruding ring is poor. Therefore, the axial projection of the extrusion surface close to one end of the deformation structure is located in the avoidance gap, which ensures the sealing performance of the sealing protruding ring and the sealing ring groove, and keeps the avoidance gap between the first avoidance part and the second avoidance part at an appropriate size, reducing the probability of wear and tear.

[0021] Preferably, the pressure receiving part is a plane, the extrusion part is also a plane, and the extrusion surface formed by the extrusion of the extrusion part and the pressure receiving part is a plane. In this way, the plane is extruded, the movement space of the sealing protruding ring in the sealing ring groove is smaller, and the sealing surface is less likely to be damaged, ensuring the sealing performance of the sealing structure.

[0022] Preferably, the pump rear cavity has a third avoiding portion near one end of the deformation structure, the third avoiding portion is connected to one end of the extrusion surface near the deformation structure, and the third avoiding portion is spaced apart from the outer surface of the deformation structure. The third avoiding portion reduces the contact wear of the outer surface of the deformation structure during deformation. At the same time, the third avoiding portion does not exert pressure on the avoiding gap, and the third avoiding portion is connected to one end of the extrusion surface near the deformation structure. Therefore, the area corresponding to the sealing structure in the pump rear cavity only the extrusion portion exerts pressure on the sealing structure. The influence of the pump rear cavity on the sealing structure is divided by the connection end of the third avoiding portion and the extrusion surface. Therefore, the axial projection of the connection end of the third avoiding portion and the extrusion surface is located in the avoiding gap, so that the third avoiding portion cooperates with the avoiding gap to ensure effective sealing of the sealing convex ring and avoid contact wear of the deformation structure during upward movement. If the axial projection of the connection end of the third avoiding portion and the extrusion surface is not in the avoiding gap but in the sealing convex ring, although the gap between the third avoiding portion and the deformation structure is larger, the contact wear of the deformation structure during upward stretching can be effectively avoided. However, part of the third avoiding portion corresponds to the sealing convex ring, and cannot exert pressure on the corresponding pressure receiving portion, so that the side wall of the sealing convex ring cannot be sealed, and there is a risk of leakage. If the axial projection of the connection end of the third avoiding portion and the extrusion surface is not in the avoiding gap but too close to the deformation structure, although the extrusion surface can completely cover the sealing convex ring, the sealing effect is good, but the connection end of the third avoiding portion and the extrusion surface is too close to the deformation structure, resulting in that the third avoiding portion is small, the avoiding effect of the deformation structure during upward stretching is poor, and contact wear may still occur during large deformation of the deformation structure.

[0023] Preferably, the eccentric power assembly comprises a connecting column fixedly connected with the deformation structure, and a fourth avoiding portion is arranged on the connecting column and spaced apart from the outer surface of the deformation structure. The fourth avoiding portion reduces the contact wear of the outer surface of the deformation structure during deformation and avoids weakening the structural strength of the deformation structure.

[0024] Preferably, the deformation structure comprises a deformation portion and a fixed portion connected with the connecting column, the deformation portion comprises a convex curved surface protruding towards the eccentric power assembly, the fourth avoiding portion is a rounded corner, the rounded corner is spaced apart from the convex curved surface, and the rounded corner is spaced apart from the end face of the fixed portion near the deformation portion.

[0025] In this way, the convex curved surface of the deformation portion reduces stress concentration and friction, effectively improves the fatigue resistance of the deformation structure, enables the deformation structure to maintain stable performance under long-term working conditions, and reduces maintenance requirements. At the same time, the fourth avoiding portion is a rounded corner and is spaced apart from the convex curved surface, which can reduce the contact area, reduce wear and prolong the service life of the deformation structure.

[0026] Compared with the prior art, the utility model has at least the following beneficial effects:

[0027] The diaphragm pump of the utility model, the diaphragm assembly is sealed with the rotation liquid cavity, and the volume of the rotation liquid cavity is changed through the deformation of the deformation structure, and the rotation liquid cavity is sealed by using the sealing structure, when the deformation structure deforms, the sealing structure is pulled to make it rub off powder with the pump rear cavity and the pump chamber, especially the surface of the sealing convex ring in the sealing structure, if the powder is rubbed off, the powder will enter the rotation liquid cavity to pollute the liquid, therefore, the surface of the sealing convex ring includes the first sealing surface and the first avoiding part, the side wall of the sealing ring groove includes the second sealing surface and the second avoiding part, the first sealing surface and the second sealing surface cooperate to seal the rotation liquid cavity, the first avoiding part and the second avoiding part form the avoiding gap, and the avoiding gap is communicated with the rotation liquid cavity, so that the sealing convex ring and the sealing ring groove keep from contacting and rubbing at the opening of the side close to the rotation liquid cavity in the state of not being forced, and in the working process of the diaphragm pump, the sealing convex ring is pulled by the deformation structure, and the avoiding gap also serves as the deformation space, so that the contact and friction between the sealing convex ring and the end surface of the pump chamber are reduced, the probability of rubbing off powder is reduced, and the liquid is prevented from being polluted. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced as follows, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0029] Figure 1 It is a sectional view of the diaphragm pump of the utility model embodiment.

[0030] Figure 2 It is an enlarged view of A in Figure 1

[0031] Figure 3 It is an enlarged view of B in Figure 1

[0032] Figure 4 It is a schematic view of the first avoiding part and the second avoiding part of another embodiment of the utility model.

[0033] MARKING OF DRAWINGS

[0034] ​​10, pump chamber module; 11, pump front cavity; 111, liquid inlet; 112, liquid outlet; 12, pump chamber; 121, sealing ring groove; 122, second avoiding part; 123, second sealing surface; 13, pump rear cavity; 131, extrusion part; 132, third avoiding part; 14, liquid inlet cavity; 15, liquid outlet cavity; 16, liquid transfer cavity; 17, liquid inlet one-way valve; 18, liquid outlet one-way valve;

[0035] 20, diaphragm assembly; 21, deformation structure; 211, deformation part; 212, fixed part; 213, convex curved surface; 22, sealing structure; 221, sealing convex ring; 222, pressure receiving part; 223, first avoiding part; 224, first sealing surface; 225, avoiding gap; 226, straight section; 227, circular arc section; 228, extrusion surface;

[0036] 30, eccentric power assembly; 31, connecting column; 311, fourth avoiding part. DETAILED DESCRIPTION

[0037] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0038] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] As Figure 1As shown, the diaphragm pump of the utility model embodiment, including pump chamber module 10, diaphragm assembly 20 and eccentric power assembly 30, pump chamber module 10 provides the chamber and flow channel of liquid flow, specifically including pump front cavity 11, pump chamber 12 and pump rear cavity 13, pump chamber 12 is assembled in pump front cavity 11, pump rear cavity 13 is fixed in the opening of pump front cavity 11, pump chamber 12 is clamped and fixed in pump front cavity 11, and the three are fixedly connected.

[0041] Pump front cavity 11 includes liquid inlet 111 and liquid outlet 112, pump chamber 12 is assembled between pump front cavity 11 and pump rear cavity 13, and forms liquid inlet cavity 14 communicated with liquid inlet 111 and liquid outlet cavity 15 communicated with liquid outlet 112 with pump front cavity 11 sealed, pump chamber module 10 has multiple rotation liquid cavities 16, liquid inlet one-way valve 17 is arranged between liquid inlet cavity 14 and rotation liquid cavity 16, liquid outlet one-way valve 18 is arranged between rotation liquid cavity 16 and liquid outlet cavity 15, liquid inlet cavity 14 and rotation liquid cavity 16 are realized one-way communication through liquid inlet one-way valve 17, liquid can flow from liquid inlet 111 into liquid inlet cavity 14, and cannot flow reversely; rotation liquid cavity 16 and liquid outlet cavity 15 are realized one-way communication through liquid outlet one-way valve 18, liquid flows from rotation liquid cavity 16 to liquid outlet cavity 15, and then flows out from liquid outlet 112, and cannot flow reversely.

[0042] In order to realize the flow of liquid between liquid inlet cavity 14 and rotation liquid cavity 16 and rotation liquid cavity 16 and liquid outlet cavity 15, diaphragm assembly 20 is respectively arranged in sealing with each rotation liquid cavity 16, eccentric power assembly 30 is in transmission connection with diaphragm assembly 20, so as to alternately change the distance between diaphragm assembly 20 and liquid inlet one-way valve 17 in each rotation liquid cavity 16, so that each rotation liquid cavity 16 is alternately communicated with liquid inlet cavity 14 to realize liquid absorption or is alternately communicated with liquid outlet cavity 15 to realize liquid discharge, wherein diaphragm assembly 20 can be an integral structure or a split structure. The structure of eccentric power assembly 30 and the matching mode with diaphragm assembly 20 are the same as those of conventional diaphragm pumps, and will not be repeated here.

[0043] Diaphragm assembly 20 includes deformation structure 21 corresponding to each rotation liquid cavity 16 and sealing structure 22 arranged on the outer periphery of deformation structure 21, and deformation structure 21 is in fixed connection with eccentric power assembly 30, wherein deformation structure 21 and sealing structure 22 are integrally formed to constitute diaphragm assembly 20. In the working process of the diaphragm pump, each deformation structure 21 is axially pushed and pulled and deformed under the action of eccentric power assembly 30, and the volume of rotation liquid cavity 16 is changed, thereby generating suction force or thrust on the liquid.

[0044] Specifically, the deformation structure 21 has an inner surface facing the rotating liquid cavity 16 and an outer surface facing away from the rotating liquid cavity 16; the end surface of the pump chamber 12 is provided with a sealing ring groove 121, and the sealing structure 22 includes a sealing convex ring 221, the sealing structure 22 is clamped by the pump rear cavity 13 and the pump chamber 12, and the sealing convex ring 221 is embedded in the sealing ring groove 121 for sealing cooperation. In the deformation process of the deformation structure 21, the sealing structure 22 is also pulled to the side close to the rotating liquid cavity 16, so that friction occurs between the sealing structure 22 and the opening of the sealing ring groove 121 and the end surface of the pump chamber 12. At the same time, in order to ensure the deformation ability of the diaphragm assembly 20, the hardness of the diaphragm assembly 20 cannot be too high, and after frequent friction with the end surface of the pump chamber 12 and the opening of the sealing ring groove 121, the diaphragm assembly 20 is easy to wear and produce powder or particles, especially the surface of the sealing convex ring 221 in the sealing structure 22 facing the rotating liquid cavity 16. If the powder is rubbed off, the powder will enter the rotating liquid cavity 16 and contaminate the liquid.

[0045] Therefore, as Figure 2 shown, the surface of the sealing convex ring 221 includes a first sealing surface 224 and a first avoiding part 223, the sidewall of the sealing ring groove 121 includes a second sealing surface 123 and a second avoiding part 122, the first sealing surface 224 is in sealing contact with the second sealing surface 123, the second avoiding part 122 is located at the opening of the sealing ring groove 121, and the first avoiding part 223 is arranged in a spaced manner with the second avoiding part 122 to form an avoiding gap 225. Among them, the first sealing surface 224 refers to the part of the surface of the sealing convex ring 221 in sealing contact with the sidewall of the sealing ring groove 121, and the second sealing surface 123 refers to the part of the sidewall of the sealing ring groove 121 in sealing contact with the sealing convex ring 221. The first sealing surface 224 and the second sealing surface 123 cooperate to seal the rotating liquid cavity 16, and the first avoiding part 223 and the second avoiding part 122 form the avoiding gap 225, so that the sealing convex ring 221 and the sealing ring groove 121 close to the opening of the rotating liquid cavity 16 are not in contact and friction in the state of not being forced. In the working process of the diaphragm pump, the sealing convex ring 221 is pulled by the deformation structure 21, and the avoiding gap 225 also serves as a deformation space, reducing the contact and friction between the sealing convex ring 221 and the end surface of the pump chamber 12, reducing the probability of rubbing off the powder, and avoiding contamination of the liquid.

[0046] As Figure 2As shown, the first avoiding part 223 connects the first sealing surface 224 and the inner surface of the deformation structure 21, ensuring the integrity of the membrane assembly 20 towards the side surface of the rotating liquid cavity 16, and the second avoiding part 122 connects the second sealing surface 123 and the end surface of the pump chamber 12 located outside the sealing ring groove 121, and the inner surface of the deformation structure 21 is arranged in a spaced manner with the end surface of the pump chamber 12; thus, the avoiding gap 225 is in communication with the rotating liquid cavity 16, so that the first avoiding part 223 of the self-sealing structure 22 to the inner surface of the deformation structure 21 of the membrane assembly 20 are all kept in a gap with the end surface of the pump chamber 12 and the opening of the sealing ring groove 121, and try not to contact and rub, so as to reduce the probability of friction and powder loss and avoid pollution of the liquid.

[0047] The specific structure of the first avoiding part 223 and the second avoiding part 122 can be various, for example, in some embodiments, as shown in the drawings, Figure 4 As shown, the first avoiding part 223 and the second avoiding part 122 are inclined surfaces with different slopes, that is, chamfers are arranged outside the sealing ring groove 121 and the sealing convex ring 221 respectively, and due to the different slopes, a gap is naturally formed between the first avoiding part 223 and the second avoiding part 122, that is, even if they contact, it is a line contact, the contact area is small, and the probability of friction and powder loss is low; or the first avoiding part 223 and the second avoiding part 122 are grooves or notches respectively, and the openings of the grooves or notches are arranged opposite to each other, and the avoiding gap 225 is formed in a natural state.

[0048] As shown in the drawings, Figure 2 In the present embodiment, the first avoiding part 223 is an arc surface, and the second avoiding part 122 is an arc surface, which can reduce the stress concentration of the sealing convex ring 221 and the sealing ring groove 121, improve the strength and durability, and effectively reduce the risk of fatigue cracks; on the other hand, the sealing convex ring 221 is pulled by the deformation structure 21, and if the first avoiding part 223 inevitably contacts the second avoiding part 122, the arc surface can more evenly distribute the pressure than the flat surface, thereby reducing the pressure per unit area and reducing wear.

[0049] As preferred, the center of the arc surface of the first avoiding part 223 and the center of the arc surface of the second avoiding part 122 are located on the same side of the avoiding gap 225, that is, the fillets are arranged outside the sealing ring groove 121 and the sealing convex ring 221 respectively, to ensure the structural strength of the sealing ring groove 121, and the radius corresponding to the arc surface of the first avoiding part 223 is smaller than the radius corresponding to the arc surface of the second avoiding part 122, so that the avoiding gap 225 formed by the first avoiding part 223 and the second avoiding part 122 is larger, and even if the first avoiding part 223 and the second avoiding part 122 contact, they will not completely fit, the contact area is smaller, and the wear area is also smaller, thereby reducing the probability of wear and powder loss.

[0050] As shown in the drawings, Figure 2As shown, since the arc surface of the second avoiding part 122 corresponds to a larger radius, the starting end of the second avoiding part 122 is in contact with the first sealing surface 224, that is, the first avoiding part 223 is not in contact with the second avoiding part 122 in the natural state, and the minimum distance of the avoiding gap 225 in the natural state is greater than 0. Based on the positions of the first avoiding part 223 and the second avoiding part 122, it can be known that the first avoiding part 223 and the second avoiding part 122 are relatively close to the rotating liquid cavity 16, the side of the sealing convex ring 221 away from the rotating liquid cavity 16 is subjected to a smaller pulling force and a smaller deformation, and at the same time, for the first avoiding part 223 and the first sealing surface 224 on the same side, the farther away from the rotating liquid cavity 16, the smaller the pulling force and the deformation of the sealing convex ring 221, and the smaller the size of the avoiding gap 225 on the side, which can ensure the sealing performance of the sealing convex ring 221 and the sealing ring groove 121; and the closer to the rotating liquid cavity 16, the greater the pulling force and the deformation of the sealing structure 22, especially the region connected with the deforming structure 21, therefore, the size of the avoiding gap 225 on the side is larger, which provides enough space for the sealing structure 22 to overcome the pulling of the deforming structure 21 and not to be in contact and friction with the opening of the sealing ring groove 121 and the end surface of the pump chamber 12.

[0051] As shown in the figure, Figure 2 The sealing convex ring 221 includes a straight section 226 and a circular arc section 227, the first sealing surface 224 is formed by the outer surfaces of the straight section 226 and the circular arc section 227, and the straight section 226 and the circular arc section 227 are in sealing fit with the groove wall of the sealing ring groove 121, which ensures the sealing performance of the sealing convex ring 221 and the sealing ring groove 121, and the starting end of the second avoiding part 122 is connected with the outer surface of the straight section 226, so that a small amount of straight section 226 close to the rotating liquid cavity 16 is also spaced apart from the second avoiding part 122, further reducing the friction probability of the sealing structure 22 and the sealing ring groove 121.

[0052] As shown in the figure, Figure 2 In the embodiment, only the end surface of the pump chamber 12 is provided with the sealing ring groove 121, one side of the sealing structure 22 in the axial direction is the sealing convex ring 221, and the other side in the axial direction is the pressure receiving part 222, that is, the sealing convex ring 221 and the pressure receiving part 222 form the sealing structure 22, the sealing convex ring 221 is embedded in the sealing ring groove 121 of the pump chamber 12, the pump rear cavity 13 has an extrusion part 131 corresponding to the pressure receiving part 222 and used for extruding the sealing convex ring 221, and the pressure receiving part 222 is in extrusion contact with the extrusion part 131 to form an extrusion surface 228. At the same time, the extrusion force applied by the pump rear cavity 13 to the extrusion part 131 can press the sealing convex ring 221 into the sealing ring groove 121, so as to realize the sealing on one side of the sealing structure 22.

[0053] In some embodiments, the end face of the pump chamber 12 and the pump rear cavity 13 are provided with a sealing ring groove 121, and the sealing convex ring 221 is embedded in the sealing ring groove 121 of the end face of the pump chamber 12 and the pump rear cavity 13, and the pressure receiving part 222 of the present embodiment is another sealing convex ring 221.

[0054] Preferably, in the present embodiment, the pressure receiving part 222 is a plane, the extrusion part 131 is also a plane, the extrusion surface 228 formed by the extrusion of the extrusion part 131 and the pressure receiving part 222 is a plane, a planar extrusion seal is formed, the movement space of the sealing structure 22 between the pump chamber 12 and the pump rear cavity 13 is smaller, and the sealing convex ring 221 is less likely to be disengaged after interference fit with the sealing ring groove 121, thereby ensuring the sealing performance of the sealing structure 22.

[0055] As a preference, the axial projection of the extrusion surface 228 near one end of the deformation structure 21 is located in the avoidance gap 225, and the end projection is as shown by the dashed line in Figure 2 Meanwhile, the axial projection of the extrusion surface 228 covers the sealing convex ring 221. The position of the extrusion part 131 and the pressure receiving part 222 will affect the sealing performance of the sealing convex ring 221 and the sealing ring groove 121 and the avoidance gap 225 between the first avoidance part 223 and the second avoidance part 122. If the axial projection of the extrusion surface 228 near one end of the deformation structure 21 is relatively close to the rotating liquid cavity 16 and not in the avoidance gap 225, the axial force exerted by the extrusion part 131 can completely cover the sealing convex ring 221, but the avoidance gap 225 between the first avoidance part 223 and the second avoidance part 122 is reduced, and the deformation of the deformation structure 21 in the direction away from the rotating liquid cavity 16 is hindered. If the axial projection of the extrusion surface 228 near one end of the deformation structure 21 is relatively far away from the rotating liquid cavity 16 and not in the avoidance gap 225, the axial force exerted by the extrusion part 131 will not reduce the avoidance gap 225 and will not affect the deformation of the deformation structure 21 in the direction away from the rotating liquid cavity 16, but it cannot completely cover the sealing convex ring 221, and the extrusion sealing effect of the sealing convex ring 221 is poor. Therefore, the axial projection of the extrusion surface 228 near one end of the deformation structure 21 is located in the avoidance gap 225, and the axial projection of the extrusion surface 228 covers the sealing convex ring 221, which ensures the sealing performance of the sealing convex ring and the sealing ring groove 121, and maintains the avoidance gap 225 between the first avoidance part 223 and the second avoidance part 122 at an appropriate size, thereby reducing the probability of wear and tear.

[0056] As Figure 2As shown, the third avoiding part 132 of the pump rear cavity 13 is close to one end of the extrusion surface 228 close to the deformation structure 21, and is spaced apart from the outer surface of the deformation structure 21; specifically, the outer surface of the deformation structure 21 is connected at a right angle to the surface of the sealing structure 22, and the right angle formed is opposite to the third avoiding part 132 and is spaced apart, so that one of the functions of the third avoiding part 132 is to avoid interfering with the upward deformation of the deformation structure, and the region where the outer surface of the deformation structure 21 is connected to the sealing structure 22 can also be appropriately moved upward, but this will bring another problem, that is, after the sealing structure is pulled upward by the deformation structure 21, it can cause the sealing failure of the sealing convex ring and the sealing ring groove, and the third avoiding part 132 is close to one end of the extrusion surface close to the deformation structure 21, so the third avoiding part 132 will not exert pressure on the avoiding gap 225, and thus it can be known that only the extrusion part 131 of the region corresponding to the sealing structure of the pump rear cavity 13 will exert pressure on the sealing structure, and the influence of the pump rear cavity 13 on the sealing structure is divided by the connection end of the third avoiding part 132 and the extrusion surface 228, so the position of the connection end of the third avoiding part 132 and the extrusion surface 228 needs to be controlled, the axial projection of the connection end of the third avoiding part 132 and the extrusion surface 228 is located in the avoiding gap 225, so that the third avoiding part 132 cooperates with the avoiding gap 225 to ensure effective sealing of the sealing convex ring 221 and avoid limiting the upward deformation of the deformation structure 21; if the axial projection of the connection end of the third avoiding part 132 and the extrusion surface 228 is not in the avoiding gap 225, but in the sealing convex ring 221, although the gap between the third avoiding part 132 and the deformation structure 21 is larger, the contact wear caused by the upward stretching of the deformation structure 21 can be effectively avoided, so that the connection between the deformation structure 21 and the sealing structure 22 can be stretched upward, but part of the third avoiding part 132 corresponds to the sealing convex ring 221, and cannot exert pressure on the corresponding pressure receiving part 222, so the side wall of the sealing convex ring 221 cannot be sealed, and there is a risk of leakage; if the axial projection of the connection end of the third avoiding part 132 and the extrusion surface 228 is not in the avoiding gap 225 but is too close to the deformation structure 21, although the extrusion surface 228 can completely cover the sealing convex ring 221, the sealing effect is good, but the connection end of the third avoiding part 132 and the extrusion surface 228 is too close to the deformation structure 21, so that the third avoiding part 132 is small, and the avoiding effect of the upward stretching of the deformation structure 21 is poor, and contact wear can still occur when the deformation structure 21 deforms greatly.

[0057] As shown in the figure, Figure 2 The third avoiding part 132 can be a rounded corner, opposite to the right angle at the connection between the outer surface of the deformation structure 21 and the surface of the sealing structure 22, and the radius of the rounded corner needs to be determined according to the position of the connection end of the third avoiding part 132 and the extrusion surface 228.

[0058] AsFigure 1 As shown, the eccentric power assembly 30 includes a connecting column 31 fixedly connected with the deformation structure 21, and a fourth avoiding part 311 is arranged on the connecting column 31 and is spaced apart from the outer surface of the deformation structure 21. The fourth avoiding part 311 reduces the contact abrasion of the outer surface of the deformation structure 21 during deformation, and avoids weakening the structural strength of the deformation structure 21.

[0059] As shown in Figure 1 and Figure 3 The deformation structure 21 includes a deformation part 211 and a fixed part 212 connected with the connecting column 31. The deformation part 211 includes a convex curved surface 213 protruding towards the eccentric power assembly 30, which reduces stress concentration and friction, effectively improves the fatigue resistance of the deformation structure 21, enables it to maintain stable performance under long-term working conditions, and reduces maintenance requirements. The convex curved surface 213 is relatively close to the eccentric power assembly 30, which includes a connecting column 31 fixedly connected with the deformation structure 21. If the convex curved surface 213 is in long-term contact and friction with the connecting column 31, the structural strength of the deformation structure 21 will be damaged, and even the deformation structure 21 will be broken, the sealing of the liquid transfer cavity 16 will fail, and the liquid cannot be transferred in and out. Therefore, the fourth avoiding part 311 is arranged, and the fourth avoiding part 311 is a round corner and is spaced apart from the convex curved surface 213, which can reduce the contact area, reduce abrasion and prolong the service life of the deformation structure 21.

[0060] The above embodiments are only preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application. Any non-essential changes and substitutions made by those skilled in the art based on the present application are within the scope of protection of the present application.

Claims

1. A diaphragm pump comprising a pump chamber module, a diaphragm assembly and an eccentric power assembly; the pump chamber module comprises a pump front cavity, a pump chamber and a pump rear cavity, the pump front cavity comprises a liquid inlet and a liquid outlet, the pump chamber is assembled between the pump front cavity and the pump rear cavity and sealed with the pump front cavity to form a liquid inlet cavity communicated with the liquid inlet and a liquid outlet cavity communicated with the liquid outlet; the pump chamber module has a plurality of rotating liquid cavities, a liquid inlet one-way valve is arranged between the liquid inlet cavity and the rotating liquid cavity, and a liquid outlet one-way valve is arranged between the rotating liquid cavity and the liquid outlet cavity; the diaphragm assembly is respectively arranged in sealing with each rotating liquid cavity, and the eccentric power assembly is in transmission connection with the diaphragm assembly to alternately change the distance between the diaphragm assembly and the liquid inlet one-way valve in each rotating liquid cavity, so that each rotating liquid cavity is alternately communicated with the liquid inlet cavity to realize liquid suction or alternately communicated with the liquid outlet cavity to realize liquid discharge; characterized in that the diaphragm assembly comprises a deformation structure corresponding to each rotating liquid cavity and a sealing structure arranged on the outer periphery of the deformation structure, and the deformation structure has an inner surface facing the rotating liquid cavity and an outer surface away from the rotating liquid cavity; an end surface of the pump chamber is provided with a sealing ring groove, the sealing structure comprises a sealing convex ring, the sealing structure is clamped by the pump rear cavity and the pump chamber, and the sealing convex ring is embedded in the sealing ring groove in sealing cooperation; a surface of the sealing convex ring comprises a first sealing surface and a first avoiding part, a side wall of the sealing ring groove comprises a second sealing surface and a second avoiding part, the first sealing surface is in sealing abutment with the second sealing surface, the second avoiding part is located at an opening of the sealing ring groove, and the first avoiding part is arranged in interval with the second avoiding part to form an avoiding gap.

2. The membrane pump of claim 1, wherein, the first avoiding part connects the first sealing surface and the inner surface of the deformation structure, the second avoiding part connects the second sealing surface and an end surface of the pump chamber located at the outer periphery of the sealing ring groove, and the inner surface of the deformation structure is arranged in interval with the end surface of the pump chamber.

3. The membrane pump according to claim 1 or 2, characterized in that the first avoiding part is an arc surface, and the second avoiding part is an arc surface.

4. The membrane pump of claim 3, wherein, the center of the arc surface of the first avoiding part and the center of the arc surface of the second avoiding part are located on the same side of the avoiding gap, and the corresponding radius of the arc surface of the first avoiding part is smaller than the corresponding radius of the arc surface of the second avoiding part.

5. The membrane pump of claim 3, wherein, the starting end of the second avoiding part is in contact with the first sealing surface, and the size of the avoiding gap tends to increase from the starting end of the second avoiding part to the end of the second avoiding part.

6. The membrane pump of claim 5, wherein, the sealing convex ring comprises a straight section and a circular arc section, the first sealing surface is composed of the outer surfaces of the straight section and the circular arc section, the straight section and the circular arc section are in sealing abutment with the groove wall of the sealing ring groove, and the starting end of the second avoiding part is connected with the outer surface of the straight section.

7. The membrane pump of claim 1 or 2, wherein The axial one side of the sealing structure is the sealing convex ring, and the axial other side is the pressure receiving part, the pump rear cavity has the extrusion part corresponding to the pressure receiving part and used for extruding the sealing convex ring, the pressure receiving part is in extrusion contact with the extrusion part to form the extrusion surface, the axial projection of the extrusion surface near one end of the deformation structure is located in the avoidance gap, and the axial projection of the extrusion surface covers the sealing convex ring.

8. The membrane pump of claim 7, wherein, The pressure receiving part is a plane, the extrusion part is also a plane, and the extrusion surface formed by extruding the pressure receiving part and the extrusion part is a plane; and / or, The pump rear cavity has a third avoidance part near one end of the deformation structure, the third avoidance part is connected to one end of the extrusion surface near the deformation structure, and the third avoidance part is arranged in a spaced mode with the outer surface of the deformation structure.

9. The membrane pump of claim 1 or 2, wherein The eccentric power assembly comprises a connecting column fixedly connected with the deformation structure, and the connecting column is provided with a fourth avoidance part arranged in a spaced mode with the outer surface of the deformation structure.

10. The membrane pump of claim 9, wherein, The deformation structure comprises a deformation part and a fixed part connected with the connecting column, the deformation part comprises a convex curved surface protruding towards the eccentric power assembly, the fourth avoidance part is a round corner, the round corner is arranged in a spaced mode with the convex curved surface, and the round corner is arranged in a spaced mode with the end surface of the fixed part near the deformation part.

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