Non-porous diaphragm structure and diaphragm pump with same

Abstract

The utility model relates to a non-porous diaphragm structure and a diaphragm pump with the same, the non-porous diaphragm structure comprises a diaphragm body, a fixed plate is embedded in the lower part of the diaphragm body, the fixed plate is completely wrapped by the diaphragm body, the fixed plate comprises a fixed plate body, and the fixed plate body is provided with a through hole. A fixing plate connecting hole penetrating through the upper surface and the lower surface of the fixing plate body is formed in the fixing plate body, the lower surface of the diaphragm body is connected with a connecting plate, and the connecting plate comprises a connecting plate body; the connecting plate body is provided with connecting plate connecting holes which penetrate through the upper surface and the lower surface of the connecting plate body and correspond to the fixing plate connecting holes, and the connecting plate body is provided with connecting plate piston connecting holes which penetrate through the upper surface and the lower surface of the connecting plate body. According to the diaphragm pump, conveyed liquid can be prevented from leaking into the piston cavity, the phenomena of tension fracture and bulging of the diaphragm can be effectively reduced, the service life of the diaphragm and the service life of the diaphragm pump are prolonged, meanwhile, the single flow and the volume efficiency can be increased, and therefore the larger liquid outlet amount and the larger liquid outlet pressure are provided.

Description

Technical Field

[0001] The utility model relates to the field of diaphragm pumps, and particularly relates to a pore-free diaphragm structure and a diaphragm pump with such a structure. Background Art

[0002] A diaphragm pump is a positive-displacement pump that separates the liquid to be transported from the piston by means of a diaphragm and uses the fluctuation of the diaphragm to achieve the suction and discharge of the liquid. The inner cavity of the housing is divided into a volume chamber and a piston chamber by the diaphragm. Diaphragm pumps are mainly divided into plunger diaphragm pumps, hydraulic diaphragm pumps, and pneumatic diaphragm pumps. Regardless of the power form of the diaphragm pump, the diaphragm is one of the important components. Parameters such as the fluctuation stroke and lifespan of the diaphragm affect the corresponding characteristics of the diaphragm pump. For a plunger diaphragm pump, the piston drives the diaphragm to fluctuate up and down. When the piston moves downward, it pulls the diaphragm to increase the volume of the volume chamber to suck in the liquid. When the piston moves upward, it pushes the diaphragm to reduce the volume of the volume chamber to pressurize and discharge the sucked liquid. In the prior art, the diaphragm is connected to the piston through a connecting piece, that is, a connecting hole is opened on the diaphragm, and the diaphragm and the piston are fixedly connected through the connecting piece and the connecting hole, and seals such as sealing rings and gaskets are used to seal the connecting hole between the connecting piece and the diaphragm. The maximum pressure in the volume chamber of an agricultural diaphragm pump can reach 3 MPa, and the maximum pressure in the volume chamber of a fire-fighting diaphragm pump can reach 6 MPa. When the pressure in the volume chamber is greater than 6 MPa, even with the sealing of the seal, the ultra-high pressure will still cause the liquid in the volume chamber to enter the piston chamber along the connecting piece and the connecting hole to form leakage, resulting in pressure drop and wear of components such as the piston. In addition, when the piston moves downward, the diaphragm is stretched to suck in the liquid. Due to the stretching of the diaphragm, the middle deformed part of the diaphragm is in a deformed fatigue state and becomes thinner and repeatedly hard contacts with the cylinder liner, so that the diaphragm is easily torn or ripped. When the piston moves upward, the deformation of the diaphragm is restored, but the liquid in the volume chamber is compressed to form a high pressure. The high-pressure liquid acts on the diaphragm, especially the deformed part of the diaphragm. Due to the repeated stretching of the deformed part, it is in a deformed fatigue state and becomes thinner, so that this part is prone to bulge and deform and rupture under the action of the high-pressure liquid, resulting in problems such as diaphragm damage and pressure reduction of the diaphragm pump. At the same time, since the cross-sectional area of the piston is much smaller than the cross-sectional area of the diaphragm, when the piston moves up and down to drive the diaphragm to fluctuate, the periphery of the piston end face directly hard contacts with the corresponding position of the diaphragm, and this position of the diaphragm is continuously bent repeatedly, so that the diaphragm is prone to be torn or ripped at this place. For example, a radial diaphragm pump disclosed in Chinese Patent Application CN117489570A includes a pump unit, the number of the pump units is multiple and is used to independently transport fluids; an annular pipe body, the number of the annular pipe bodies is two and is connected to the multiple pump units. One side of the annular pipe body communicates with the inlets of the multiple pump units, and the other side of the annular pipe body communicates with the outlets of the multiple pump units. A fluid interface is provided on the annular pipe body, and the annular pipe body includes multiple single pipe bodies connected end to end; the pump unit includes a cylinder block, a piston, a diaphragm, and a connecting rod. Specifically, the eccentric shaft is driven by an external motor or an internal combustion engine, the eccentric shaft drives the piston to reciprocate along the cylinder block through the connecting rod, the piston drives the diaphragm to expand and contract, and with the check valve at the inlet and outlet of the cylinder block, the fluid can be continuously transported from the inlet to the outlet, and with the annular pipe bodies on both sides, a channel for transporting the fluid is formed.In the above-mentioned patent application, the up-and-down movement of the piston causes the diaphragm to come into hard contact with the cylinder liner and the piston. Coupled with the action of the high-pressure liquid in the volume chamber, the diaphragm is prone to problems such as tearing and bulging, and is prone to leakage under ultra-high pressure. Another example is an explosion-proof diaphragm pump disclosed in Chinese Utility Model Patent CN218266270U, which includes a mounting base and a connecting mechanism provided above the mounting base. The connecting mechanism includes a disassembly component and a compression component; the disassembly component includes a threaded disk, a sheath, a threaded plate, a compression chamber and a piston chamber. A compression chamber is provided above the mounting base. A threaded plate is fixedly connected to the side wall of the compression chamber. Piston chambers are fixedly connected to both sides of the compression chamber. One end of the piston chamber is fixedly connected to a threaded disk, and a sheath is fixedly connected to the surface of the threaded disk; the compression component includes a cylinder, a crankshaft ring, a buffer mechanism, a piston chamber, a piston rod, a diaphragm and a rubber bolt. A cylinder is fixedly connected to the top end of the compression chamber. A crankshaft ring is provided on the surface of the cylinder. A buffer mechanism is provided inside the compression chamber. A piston rod is slidably connected inside the piston chamber. One end of the piston rod is fixedly connected to a diaphragm, and a rubber bolt is fixedly connected to the outside of the diaphragm. The diaphragm in the aforementioned patent is also prone to problems such as tearing, bulging and leakage.

[0003] In view of this, the present utility model provides a pore-free diaphragm structure and a diaphragm pump having the same structure. By setting a pore-free connection method to solve the leakage problem under ultra-high pressure, by setting two U-shaped parts to provide a deformation path and a deformation stroke for the diaphragm, thereby avoiding repeated hard contact and bending between the diaphragm and the cylinder liner during the deformation process of the diaphragm, and by setting a double-layer diaphragm body and a connecting plate to avoid repeated hard contact and bending between the diaphragm and the piston during the deformation process of the diaphragm, and by setting the side part of the connecting plate for limiting to solve the problem that the diaphragm is prone to bulging and breaking. Summary of the Utility Model

[0004] The purpose of the present utility model is to provide a pore-free diaphragm structure and a diaphragm pump having the same structure to solve the deficiencies existing in the prior art. The technical problems to be solved by the present utility model are achieved through the following technical solutions.

[0005] A non-porous diaphragm structure, including a diaphragm body, is improved in that: a fixing plate is embedded in the lower part of the diaphragm body, and the fixing plate is completely wrapped by the diaphragm body. The fixing plate includes a fixing plate body, and the fixing plate body is provided with fixing plate connection holes penetrating the upper and lower surfaces of the fixing plate body. A connecting plate is connected to the lower surface of the diaphragm body. The connecting plate includes a connecting plate body, and the connecting plate body is provided with connecting plate connection holes penetrating the upper and lower surfaces of the connecting plate body and corresponding to the fixing plate connection holes. The connecting plate body is provided with connecting plate piston connection holes penetrating the upper and lower surfaces of the connecting plate body; the diaphragm body and the connecting plate are fixedly connected through a connecting member and the fixing plate connection holes and the connecting plate connection holes, and the connecting plate and the piston are fixedly connected through a connecting member and the connecting plate piston connection holes, so as to realize the fixed connection between the diaphragm body and the piston.

[0006] Preferably, the fixing plate is provided with fixing plate glue holes.

[0007] Preferably, a connecting plate upper accommodating part and a connecting plate lower accommodating part are respectively arranged in the middle of the upper and lower surfaces of the connecting plate body, and the connecting plate piston connection holes penetrate the lower and upper surfaces of the connecting plate upper accommodating part and the connecting plate lower accommodating part.

[0008] Preferably, a side convex part is arranged at the periphery of the upper surface of the diaphragm body.

[0009] Preferably, the diaphragm body includes a first horizontal part, at least one first U-shaped part, at least one second U-shaped part, and a second horizontal part. One end of the first U-shaped part at the uppermost layer is connected to the first horizontal part, and the other end is connected to the second U-shaped part. One end of the second U-shaped part at the lowermost layer is connected to the first U-shaped part, and the other end is connected to the second horizontal part. The number of the first U-shaped parts is equal to that of the second U-shaped parts, and the fixing plate is embedded in the second horizontal part; when the number of the first U-shaped parts and the second U-shaped parts is multiple, the second U-shaped parts between the uppermost first U-shaped part and the lowermost second U-shaped part are alternately arranged and connected in sequence.

[0010] Preferably, the connecting plate further includes connecting plate side parts, and the connecting plate side parts are located on both sides of the connecting plate body. Part of the second U-shaped part is accommodated in the connecting plate side parts, and the height of the connecting plate side parts is not lower than the thickness of the second horizontal part and not higher than the thickness of the second U-shaped part.

[0011] Preferably, the diaphragm body includes a first horizontal part, a sheet body transition part, a second horizontal part, and a third horizontal part connected in sequence. The third horizontal part is located below the second horizontal part, and the fixing plate is embedded in the third horizontal part.

[0012] Preferably, the sheet body transition part is smoothly transitioned from the end of the first horizontal part to the end of the second horizontal part, and the height of the second horizontal part in the vertical direction is lower than the height of the first horizontal part so that the diaphragm body forms a shape sunken from the first horizontal part to the second horizontal part.

[0013] Preferably, a beveled surface part is provided at the periphery of the lower surface of the first horizontal part.

[0014] A diaphragm pump includes a diaphragm structure, and the improvement lies in that: the diaphragm structure is a non-porous diaphragm structure as described in any one of the previous ones.

[0015] The utility model realizes the non-porous connection between the diaphragm body and the piston a by arranging a fixing plate embedded in the diaphragm body and a connecting plate below the diaphragm body. Since the upper part of the diaphragm body is a complete integral diaphragm structure, the ultra-high pressure liquid in the volume cavity can only act on the diaphragm body, thus avoiding the problem that the ultra-high pressure liquid in the volume cavity penetrates into the piston cavity along the connection hole, resulting in leakage and oil-liquid mixing. The utility model provides a deformation path and a deformation stroke for the diaphragm body by arranging two U-shaped parts, thereby avoiding the repeated hard contact and bending between the diaphragm body and the cylinder sleeve a during the deformation process of the diaphragm body, and also increasing the fluctuation stroke of the diaphragm body; by arranging the diaphragm body including the second horizontal part and the third horizontal part and the connecting plate to avoid the repeated hard contact and bending between the diaphragm body and the piston a during the deformation process of the diaphragm body, thereby reducing the problems of cracking and tearing of the diaphragm body at the cylinder sleeve a and the piston a. The utility model reduces the occurrence of the situation that the diaphragm body is prone to bulging and breaking by arranging the side part of the connecting plate for limiting.

[0016] In short, the utility model can avoid the leakage of the liquid to be transported into the piston cavity and can effectively reduce the occurrence of the phenomena of diaphragm cracking and bulging, thereby prolonging the service life of the diaphragm and the diaphragm pump. At the same time, it can increase the single flow rate and volumetric efficiency, thereby providing a greater liquid output and liquid output pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of an embodiment of the utility model;

[0018] Figure 2 is a full-sectional structural diagram of an embodiment of the utility model;

[0019] Figure 3 is a schematic structural diagram of the utility model during use in an embodiment;

[0020] Figure 4 is a full-sectional structural diagram of another embodiment of the utility model;

[0021] Figure 5Structural schematic diagram in use of another embodiment of the present utility model

[0022] The reference numerals in the accompanying drawings are as follows: 1, diaphragm body; 11, first horizontal part; 111, first U-shaped part; 112, second U-shaped part; 113, sheet body transition part; 12, second horizontal part; 13, third horizontal part; 14, edge convex part; 2, connecting plate; 21, connecting plate body; 22, connecting plate connection hole; 23, connecting plate piston connection hole; 24, upper accommodating part of the connecting plate; 25, lower accommodating part of the connecting plate; 26, side part of the connecting plate; 3, fixing plate; 31, fixing plate body; 32, fixing plate connection hole; 33, fixing plate glue-passing hole; a1, housing; a2, cylinder liner; a3, piston; a4, gland. Detailed implementation manners

[0023] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] Embodiment 1:

[0025] Referring to Figures 1 to 5 As shown, a non-porous diaphragm structure includes a diaphragm body 1, and the improvement lies in that: a fixing plate 3 is embedded in the lower part of the diaphragm body 1, the fixing plate 3 is completely wrapped by the diaphragm body 1, the fixing plate 3 includes a fixing plate body 31, and a fixing plate connection hole 32 penetrating through the upper and lower surfaces of the fixing plate body 31 is provided on the fixing plate body 31. A connecting plate 2 is connected to the lower surface of the diaphragm body 1. The connecting plate 2 includes a connecting plate body 21, and a connecting plate connection hole 22 penetrating through the upper and lower surfaces of the connecting plate body 21 and corresponding to the fixing plate connection hole 32 is provided on the connecting plate body 21. A connecting plate piston connection hole 23 penetrating through the upper and lower surfaces of the connecting plate body 21 is provided on the connecting plate body 21; the diaphragm body 1 and the connecting plate 2 are fixedly connected through a connecting member and the fixing plate connection hole 32 and the connecting plate connection hole 22, and the connecting plate 2 and the piston a3 are fixedly connected through a connecting member and the connecting plate piston connection hole 23, so as to realize the fixed connection between the diaphragm body 1 and the piston a3.

[0026] In this embodiment, by embedding the fixing plate 3 in the diaphragm body 1 and using the fixing plate 3 to connect with the connecting plate 2 and the connecting plate 2 to connect with the piston a3, the connection between the diaphragm body 1 and the piston a3 is realized. Since the upper part of the diaphragm body 1 is a complete integral diaphragm structure, the ultra-high pressure liquid in the volume cavity can only act on the diaphragm body 1, thereby avoiding the problems of the ultra-high pressure liquid in the volume cavity penetrating into the piston cavity along the connection hole and causing leakage and oil-liquid mixing.

[0027] In this embodiment, the setting of the connecting plate 2 can reduce tearing and increase the volumetric efficiency. In the prior art, the cross-sectional area of the piston a3 is much smaller than that of the diaphragm body 1. After the piston a3 is directly connected to the diaphragm body 1, hard contact occurs between the two. As the piston a3 moves up and down, the connection between the diaphragm body 1 and the piston a3 is repeatedly bent by hard contact, which makes the diaphragm body 1 at this place prone to tearing. However, the cross-sectional area of the connecting plate 2 is much larger than that of the piston a3, thus avoiding the problem of tearing at the lower part of the diaphragm body 1. Similarly, since the cross-sectional area of the piston a3 is much smaller than that of the diaphragm body 1, the stretching area of the diaphragm body 1 driven by the downward movement of the piston a3 is small. While the cross-sectional area of the connecting plate 2 is much larger than that of the piston a3, when the piston a3 moves downward to drive the connecting plate 2 downward and the connecting plate 2 stretches the diaphragm body 1, the stretching area of the diaphragm body 1 is large, thereby increasing the volume of the volume chamber during a single deformation and increasing the volumetric efficiency.

[0028] In this embodiment, the fixing plate 3 can, on the one hand, achieve a leak-proof connection between the diaphragm body 1 and the piston a3, and on the other hand, increase the deformation area of the diaphragm body 1, thereby increasing the deformation volume of the volume chamber. This is because the cross-sectional area of connecting parts such as nuts is much smaller than that of the diaphragm body 1. When the piston a3 moves downward to pull the diaphragm body 1 to stretch, the diaphragm body 1 will form a funnel shape at the bottom of the volume chamber under the action of the connecting parts. After the fixing plate 3 is embedded, a cylindrical shape with the same diameter will be formed at the bottom of the volume chamber, thereby increasing the deformation volume of the volume chamber, that is, increasing the single flow rate, and further increasing the volumetric efficiency.

[0029] Furthermore, both the fixing plate connection holes 32 and the connecting plate connection holes 22 are multiple and arranged in a circumferential array, and the connecting plate piston connection holes 23 are multiple and arranged in a circumferential array.

[0030] In this embodiment, both the fixing plate connection holes 32 and the connecting plate connection holes 22 are multiple and arranged in a circumferential array. Such a setting can ensure the connection strength between the fixing plate 3 and the connecting plate 2, thereby ensuring the connection strength between the connecting plate 2 and the diaphragm body 1; the connecting plate piston connection holes 23 are multiple and arranged in a circumferential array. Such a setting can ensure the connection strength between the connecting plate 2 and the piston 2, thereby ensuring the connection strength between the diaphragm body 1 and the piston a3.

[0031] Furthermore, the fixing plate 3 is provided with fixing plate glue holes 33.

[0032] In this embodiment, the fixing plate 3 is preset in the mold. When the diaphragm body 1 is injection molded, the injection molding raw material passes through the glue passing hole 33 of the fixing plate to connect the two parts of the diaphragm body 1 located above and below the fixing plate 3, so that the diaphragm body 1 tightly wraps the fixing plate 3, thereby making the diaphragm body 1 and the fixing plate 3 form a complete integral body similar to one-piece molding, further ensuring the connection strength between the diaphragm body 1 and the connecting plate 2, and further ensuring the final connection strength between the diaphragm body 1 and the piston a3. In this embodiment, when the diaphragm body 1 is injection molded, cylindrical small objects such as pins are inserted into the fixing plate connection hole 32 and then pulled out after molding. In this way, it can be ensured that there is no injection molding raw material left in the fixing plate connection hole 32, and holes can be left on the diaphragm body 1, so as to facilitate subsequent connecting parts to pass through and connect the fixing plate 3, the connecting plate 2 and the diaphragm body 1.

[0033] Furthermore, a connecting plate upper accommodating part 24 and a connecting plate lower accommodating part 25 are respectively provided in the middle of the upper and lower surfaces of the connecting plate body 21, and the connecting plate piston connection hole 23 penetrates the lower and upper surfaces of the connecting plate upper accommodating part 24 and the connecting plate lower accommodating part 25.

[0034] In this embodiment, the connecting plate upper accommodating part 24 is used to accommodate nuts, such as bolts and nuts, of connecting parts, so as to prevent the connecting parts from abutting against the diaphragm body 1; the connecting plate lower accommodating part 25 is used to accommodate the piston a3, so as to position the piston a3.

[0035] Furthermore, a side convex part 14 is provided at the periphery of the upper surface of the diaphragm body 1.

[0036] In this embodiment, by providing the side convex part 14 and using the extrusion of the gland a4 to achieve extrusion sealing. Compared with the plane extrusion sealing in the prior art, the side convex part 14 cooperates with the concave hole on the gland a4, so as to effectively extrude to achieve a better extrusion sealing effect; at the same time, due to the setting of the side convex part 14 and the cooperation of the concave hole on the gland a4, the extrusion connection between the gland a4, the cylinder sleeve a2 and the diaphragm body 1 is more stable, so as to prevent the diaphragm body 1 from being pulled off when the piston a3 moves downward and stretches the diaphragm body 1.

[0037] Embodiment 2:

[0038] On the basis of Embodiment 1, referring to Figure 2 、 3As shown, the diaphragm body 1 includes a first horizontal portion 11, at least one first U-shaped portion 111, at least one second U-shaped portion 112, and a second horizontal portion 12. One end of the first U-shaped portion 111 at the uppermost layer is connected to the first horizontal portion 11, and the other end is connected to the second U-shaped portion 112. One end of the second U-shaped portion 112 at the lowermost layer is connected to the first U-shaped portion 111, and the other end is connected to the second horizontal portion 12. The number of the first U-shaped portions 111 is equal to that of the second U-shaped portions 112. The fixing plate 3 is embedded in the second horizontal portion 12. When the number of the first U-shaped portions 111 and the second U-shaped portions 112 is multiple, the second U-shaped portions 112 between the uppermost first U-shaped portions 111 and the lowermost second U-shaped portions 112 are alternately arranged and connected in sequence.

[0039] In this embodiment, the first U-shaped portion 111 at the uppermost layer defines the deformation path of the diaphragm body 1. The first U-shaped portion 111 at the lower layer defines the deformation path of the diaphragm body 1 and provides the deformation stretching amount of the diaphragm body 1. The second U-shaped portion 112 provides the deformation stretching amount of the diaphragm body 1, thereby avoiding the problems of cracking and tearing caused by the repeated hard contact between the first horizontal portion 11 and the cylinder liner a2 when the diaphragm body 1 reciprocates, and further extending the service life of the diaphragm body 1. At the same time, by using the deformation stretching amount provided by the second U-shaped portion 112 or the second U-shaped portion 112 and the first U-shaped portion 111 at the lower layer, the diaphragm body 1 will not become thinner due to stretching during the fluctuation process, so that it is not easy to appear damaged phenomena such as cracking and tearing.

[0040] In this embodiment, through the cooperation of the first U-shaped portion 111 and the second U-shaped portion 112, the deformation path of the diaphragm body 1 is defined, the deformation stretching amount of the diaphragm body 1 is provided, and the fluctuation stroke of the diaphragm body 1 is increased. Compared with the flat diaphragm in the prior art, the situation of continuous upward and downward stretching, bending, and repeated hard contact with the cylinder liner a2 due to insufficient stroke will not occur, thereby reducing the occurrence of the situation where the diaphragm body 1 is cracked and torn.

[0041] Furthermore, the connecting plate 2 further includes connecting plate side portions 26. The connecting plate side portions 26 are located on both sides of the connecting plate body 21. A part of the second U-shaped portion 112 is accommodated in the connecting plate side portions 26. The height of the connecting plate side portions 26 is not lower than the thickness of the second horizontal portion 12 and not higher than the thickness of the second U-shaped portion 112.

[0042] In this embodiment, the arrangement of the side part 26 of the connecting plate can reduce the occurrence of the bulging deformation of the second U-shaped part 112. When the piston a3 moves upward to drive the diaphragm body 1 to recover, the liquid in the volume chamber is compressed to form high pressure. The high-pressure liquid acts on the deformed part of the diaphragm body 1, that is, on the second U-shaped part 112. At this time, the second U-shaped part 112 is prone to lateral bulging deformation, and the bulging deformed second U-shaped part 112 will also rub against the inner wall of the cylinder sleeve a2, resulting in damage to the diaphragm body 1. The side part 26 of the connecting plate in this embodiment can resist the bulging deformation of the second U-shaped part 112 from the outside inward, thereby offsetting the pressure exerted by the high-pressure liquid on the second U-shaped part 112. This is also the reason for the setting that "the height of the side part 26 of the connecting plate is not less than the thickness of the second horizontal part 12" in this embodiment.

[0043] In this embodiment, due to the arrangement of the side part 26 of the connecting plate, when the piston a3 moves upward, the side part 26 of the connecting plate may also come into hard contact with the first horizontal part 11 and cause bending of the first horizontal part 11. Therefore, in this embodiment, the height of the side part 26 of the connecting plate is set to be not higher than the thickness of the second U-shaped part 112. After such a setting, restricted by the pressure resistance of the first U-shaped part 111 and the second U-shaped part 112, the side part 26 of the connecting plate will not contact the first horizontal part 11 when the piston a3 moves upward, thus avoiding the problems of tearing and damage of the first horizontal part 11 due to the reciprocating movement of the connecting plate 2.

[0044] Embodiment 3:

[0045] On the basis of Embodiment 1, with reference to Figure 4 、 5 as shown, the diaphragm body 1 includes a first horizontal part 11, a sheet body transition part 113, a second horizontal part 12, and a third horizontal part 13 connected in sequence. The third horizontal part 13 is located below the second horizontal part 12, and the fixing plate 3 is embedded in the third horizontal part 13.

[0046] Furthermore, the sheet body transition part 113 is smoothly transitioned from the end of the first horizontal part 11 to the end of the second horizontal part 12. The height of the second horizontal part 12 in the vertical direction is lower than the height of the first horizontal part 11 so that the diaphragm body 1 forms a shape concave from the first horizontal part 11 to the second horizontal part 12.

[0047] In this embodiment, the first horizontal portion 11 is used to connect and seal the connection between the cylinder liner a2 and the gland a4, so as to divide the entire chamber into an upper volume chamber and a lower piston chamber through the diaphragm body 1. The volume chamber is used to pump the liquid to be transported. That is, when the piston a3 moves downward, it stretches the diaphragm body 1 to realize the liquid suction operation, and when the piston a3 moves upward, it squeezes the diaphragm body 1 to realize the pressurized transportation of the liquid. The separation of oil and liquid is also realized during the entire operation process. The sheet body transition portion 113 is used to provide the telescopic deformation amount and deformation path for the fluctuation of the diaphragm body 1. The fluctuation deformation of the diaphragm body 1 all occurs at the sheet body transition portion 113, thereby avoiding the repeated hard contact and bending between the first horizontal portion 11 and the cylinder liner a2, and further reducing the situation of cracking and tearing of the diaphragm body 1 at the first horizontal portion 11. When the piston a3 moves downward, the telescopic deformation amount and the defined deformation path provided by the sheet body transition portion 113 make the sheet body transition portion 113 not contact the cylinder liner a2, that is, no friction will be generated, thereby also avoiding the problem of cracking and tearing of the diaphragm body 1 at the sheet body transition portion 113. When the piston a3 moves upward, the sheet body transition portion 113 is pressed, thereby also defining the deformation amount and deformation path of the compression of the diaphragm body 1, thus avoiding the diaphragm body 1 being stretched by the upward movement of the piston a3, and can further reduce the occurrence of cracking and tearing situations. The second horizontal portion 12 is used to connect with the third horizontal portion 13 and provide the deformation area for the fluctuation of the diaphragm body 1. The third horizontal portion 13, on the one hand, can protect the second horizontal portion 12 and avoid the second horizontal portion 12 directly contacting the piston a3, thereby reducing the probability of the diaphragm body 1 being cracked and torn; on the other hand, it can increase the effective deformation area of the diaphragm body 1, thereby increasing the single flow rate and volumetric efficiency; on the third hand, it can also accommodate and embed the fixing plate 3, thereby realizing the non-porous connection between the diaphragm body 1 and the piston a3. Compared with the diaphragm in the prior art, the first horizontal portion 11, the sheet body transition portion 113 and the second horizontal portion 12 in this embodiment are equivalent to the diaphragm in the prior art. By providing the third horizontal portion 13 below the second horizontal portion 12, embedding the fixing plate 3 in the third horizontal portion 13, and providing a connecting plate 2 below the third horizontal portion 13, and connecting with the piston a3 through the fixing plate 3, the third horizontal portion 13 and the connecting plate 2, it is avoided that the second horizontal portion 12 directly appears repeated hard contact and bending with the piston a3 when the diaphragm body 1 fluctuates up and down, thereby avoiding the problem of cracking and tearing of the diaphragm body 1 at the second horizontal portion 12. Since the cross-sectional area of the third horizontal portion 13 is much larger than the cross-sectional area of the piston a3, when the piston a3 moves downward, the area of driving the diaphragm body 1 to move downward through the third horizontal portion 13 increases, thereby increasing the effective deformation area of the volume chamber, and further increasing the single flow rate and volumetric efficiency.

[0048] Further, an inclined surface portion is provided at the periphery of the lower surface of the first horizontal portion 11.

[0049] The inclined surface portion in this embodiment can seal the gap between the housing a1 and the cylinder liner a2. Refer to Figure 5 As shown, when the diaphragm pump is actually in use, there is a clearance fit between the housing a1 and the cylinder liner a2, leaving a small gap. The inclined surface portion of the diaphragm body 1 can just seal this gap.

[0050] Embodiment 4:

[0051] A diaphragm pump includes a diaphragm structure, and the improvement lies in that: the diaphragm structure is a non-porous diaphragm structure as described in any one of Embodiments 1 to 3.

[0052] In this embodiment, the fixed plate 3 embedded in the diaphragm body 1 and the connecting plate 2 below the diaphragm body 1 are provided to achieve the non-porous connection between the diaphragm body 1 and the piston a3. Since the upper part of the diaphragm body 1 is a complete integral diaphragm structure, the ultra-high pressure liquid in the volume chamber can only act on the diaphragm body 1, thus avoiding the problems of leakage and oil-liquid mixing caused by the ultra-high pressure liquid in the volume chamber penetrating into the piston chamber along the connection holes. In this embodiment, two U-shaped portions are provided to provide a deformation path and a deformation stroke for the diaphragm body 1, thereby avoiding the repeated hard contact and bending between the diaphragm body 1 and the cylinder liner a2 during the deformation process of the diaphragm body 1, and also increasing the fluctuation stroke of the diaphragm body 1; by providing the diaphragm body 1 including the second horizontal portion 12 and the third horizontal portion 13 and the connecting plate 2 to avoid the repeated hard contact and bending between the diaphragm body 1 and the piston a3 during the deformation process of the diaphragm body 1, thereby reducing the problems of tearing and splitting of the diaphragm body 1 at the cylinder liner a2 and the piston a3. In this embodiment, the side portion 26 of the connecting plate is provided for limiting, thereby reducing the occurrence of the situation where the diaphragm body 1 is easily bulged and damaged.

[0053] It should be noted that the above detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0054] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments described according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0055] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of this application are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances so that the embodiments of this application described here can be implemented in an order other than those illustrated or described here.

[0056] In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that comprises a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0057] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "above" etc. may be used here to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figure is inverted, the device described as "above" or "over" other devices or structures will then be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways, such as rotated 90 degrees or in other orientations, and corresponding interpretations of the spatial relative descriptions used here will be made.

[0058] In the detailed description above, reference has been made to the drawings which form a part hereof. In the drawings, like symbols typically identify like components, unless the context indicates otherwise. The illustrated embodiments described in the detailed description, drawings and claims are not meant to be limiting. Other embodiments may be used and other changes may be made without departing from the spirit or scope of the subject matter presented herein.

[0059] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A non-porous diaphragm structure, comprising a diaphragm body (1), characterized in that: A fixing plate (3) is embedded in the lower part of the diaphragm body (1). The fixing plate (3) is completely wrapped by the diaphragm body (1). The fixing plate (3) includes a fixing plate body (31). A fixing plate connection hole (32) penetrating the upper and lower surfaces of the fixing plate body (31) is provided on the fixing plate body (31). A connecting plate (2) is connected to the lower surface of the diaphragm body (1). The connecting plate (2) includes a connecting plate body (21). A connecting plate connection hole (22) penetrating the upper and lower surfaces of the connecting plate body (21) and corresponding to the fixing plate connection hole (32) is provided on the connecting plate body (21). A connecting plate piston connection hole (23) penetrating the upper and lower surfaces of the connecting plate body (21) is provided on the connecting plate body (21). The diaphragm body (1) and the connecting plate (2) are fixedly connected by a connecting member and the fixing plate connection hole (32) and the connecting plate connection hole (22). The connecting plate (2) and a piston (a3) are fixedly connected by a connecting member and the connecting plate piston connection hole (23), so as to realize the fixed connection between the diaphragm body (1) and the piston (a3).

2. The non-porous diaphragm structure according to claim 1, characterized in that: A fixing plate glue-passing hole (33) is provided on the fixing plate (3).

3. The non-porous diaphragm structure according to claim 1, wherein: A connecting plate upper accommodating part (24) and a connecting plate lower accommodating part (25) are respectively provided in the middle of the upper and lower surfaces of the connecting plate body (21). The connecting plate piston connection hole (23) penetrates the lower and upper surfaces of the connecting plate upper accommodating part (24) and the connecting plate lower accommodating part (25).

4. The non-porous diaphragm structure according to claim 1, characterized in that: An edge protruding part (14) is provided at the periphery of the upper surface of the diaphragm body (1).

5. A non-porous diaphragm structure according to claim 1, wherein: The diaphragm body (1) includes a first horizontal part (11), at least one first U-shaped part (111), at least one second U-shaped part (112), and a second horizontal part (12). One end of the first U-shaped part (111) located at the uppermost layer is connected to the first horizontal part (11), and the other end is connected to the second U-shaped part (112). One end of the second U-shaped part (112) located at the lowermost layer is connected to the first U-shaped part (111), and the other end is connected to the second horizontal part (12). The number of the first U-shaped parts (111) is equal to that of the second U-shaped parts (112). The fixing plate (3) is embedded in the second horizontal part (12). When the number of the first U-shaped parts (111) and the second U-shaped parts (112) is multiple, the second U-shaped parts (112) between the uppermost first U-shaped part (111) and the lowermost second U-shaped part (112) are alternately arranged and connected in sequence.

6. The non-porous diaphragm structure according to claim 5, characterized in that: The connecting plate (2) further includes connecting plate side parts (26). The connecting plate side parts (26) are located on both sides of the connecting plate body (21). Part of the second U-shaped part (112) is accommodated in the connecting plate side parts (26). The height of the connecting plate side parts (26) is not lower than the thickness of the second horizontal part (12) and not higher than the thickness of the second U-shaped part (112).

7. The non-porous diaphragm structure according to claim 1, wherein: The diaphragm body (1) includes a first horizontal portion (11), a sheet transition portion (113), a second horizontal portion (12), and a third horizontal portion (13) connected in sequence. The third horizontal portion (13) is located below the second horizontal portion (12), and the fixing plate (3) is embedded in the third horizontal portion (13).

8. The non-porous diaphragm structure according to claim 7, wherein: The sheet transition portion (113) smoothly transitions from the end of the first horizontal portion (11) to the end of the second horizontal portion (12). The height of the second horizontal portion (12) in the vertical direction is lower than the height of the first horizontal portion (11) so that the diaphragm body (1) forms a shape that is recessed from the first horizontal portion (11) to the second horizontal portion (12).

9. The non-porous diaphragm structure according to claim 7, wherein: An inclined surface portion is provided at the periphery of the lower surface of the first horizontal portion (11).

10. A diaphragm pump, comprising a diaphragm structure, characterized in that: The diaphragm structure is a non-porous diaphragm structure according to any one of claims 1-9.

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