Diaphragm pump

Abstract

This application discloses a diaphragm pump, comprising: an integrated plunger rod, a motor, a worm gear, a diaphragm, a cylinder liner, a connecting rod, an eccentric block, and a slide rod, all installed within a housing. The motor, coupling, worm gear, connecting rod, eccentric block, and worm wheel are housed within the drive cavity of the housing; the diaphragm, integrated plunger rod, and cylinder liner are housed within the solution extrusion cavity of the housing. Using this pump body can effectively improve the shear stress concentration resistance of the plunger rod during operation without affecting transmission performance, thus reducing the possibility of plunger body breakage during operation. In actual use, no breakage has been observed during routine inspections for over four years.

Description

Technical Field

[0001] This application relates to the field of material conveying technology, and in particular to a diaphragm pump. Background Technology

[0002] Diaphragm pumps are widely used in petrochemical, chemical, coal, electricity and oil, light textile, and metallurgical industries. The plunger body is an important component for the normal operation of the diaphragm pump, and its function is to transmit power. However, existing diaphragm pumps have the following problems during use: ① The existing structure causes stress concentration at the smallest journal of the plunger body, making the plunger body prone to breakage when transmitting torque. In actual use, it has been found that multiple breakages can occur within one year; ② There are many parts at the connection points, the installation cavity volume is small, the connection method is complicated, and disassembly, replacement and installation are difficult.

[0003] See Figure 1 The existing plunger rod has a plunger locking plate 33', a plunger anti-loosening nut 34', a plunger anti-tightening nut 35', and a plunger 36' installed on its mounting end to connect with the slide rod. Once the plunger anti-loosening nut 35 and the plunger locking nut 34 loosen, the plunger rod (11.1 mm) will be subjected to radial shear force. This shear force will repeatedly act at the minimum point of the plunger rod journal (6.9 mm) until the plunger rod journal breaks at the minimum point.

[0004] The information disclosed in the background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] This application addresses the aforementioned technical problems by providing a diaphragm pump. This diaphragm pump effectively improves the shear stress concentration resistance of the plunger rod during use, effectively reduces the frequency of shaft breakage, and improves equipment operating efficiency. It also reduces the number of parts, lowers manufacturing difficulty and cost, facilitates installation, and improves maintenance efficiency.

[0006] This application provides a diaphragm pump, including: an integral plunger rod, a motor, a worm gear, a diaphragm, a cylinder liner, a connecting rod, an eccentric block, and a slide rod, all installed within a housing; the motor, coupling, worm gear, connecting rod, eccentric block, and worm wheel are housed within the drive cavity of the housing.

[0007] The diaphragm, integrated plunger rod, and cylinder liner are housed within the solution extrusion chamber of the housing;

[0008] The solution extrusion chamber of the housing is located on one side of the drive chamber of the housing and is connected to the drive chamber of the housing.

[0009] The motor and worm gear drive are connected; the eccentric block is sleeved on the worm gear; the connecting rod is sleeved on the eccentric block;

[0010] The plunger housing is located within the cylinder liner; one end of the slide rod is connected to the connecting rod drive, and the other end is connected to one end of the integral plunger rod;

[0011] The extension end of the integrated plunger rod is configured to contact the diaphragm drive.

[0012] The integrated plunger rod includes: a rod body, a retaining ring, a first locking pin, and a second locking pin; one end of the rod body is connected to the plunger, and the other end is provided with a retaining ring, a first locking pin, and a second locking pin; the retaining ring, the first locking pin, and the second locking pin are installed inside the slide rod and are driven by the slide rod.

[0013] Preferably, the mounting end of the slide bar is recessed to form a mounting groove; the mounting groove is provided with a locking platform, a locking hole, and a locking slot.

[0014] Preferably, the retaining ring is engaged in the engagement groove; the first engagement pin is engaged in the engagement platform; and the second engagement pin is inserted into the engagement hole.

[0015] Preferably, it includes: a coupling; the motor is connected to the worm gear drive via the coupling.

[0016] Preferably, an installation tube is provided on the upper part of the drive cavity of the housing; the coupling is housed in the installation tube; and the motor is installed on the installation tube.

[0017] Preferably, it includes: a worm gear; the worm gear is housed in the drive cavity of the housing; the worm gear is sleeved on the lower part of the worm.

[0018] The beneficial effects that this application can produce include:

[0019] 1) The diaphragm pump provided in this application, using this pump body, can effectively improve the shear stress concentration resistance of the plunger rod during operation without affecting the transmission performance, and reduce the possibility of plunger body breakage during operation. After actual use, no breakage has been observed in routine inspections for more than 4 years.

[0020] 2) The diaphragm pump provided in this application is easy to assemble in a small cavity, reducing installation difficulty and reducing the replacement and assembly time from approximately 2 hours to half an hour, thus improving maintenance efficiency. It also reduces the number of parts, lowering the difficulty and cost of component design and manufacturing. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of an existing plunger rod structure;

[0022] Figure 2 A schematic front cross-sectional view of a diaphragm pump in at least one embodiment provided in this application;

[0023] Figure 3Another cross-sectional schematic diagram of the diaphragm pump in at least one embodiment provided in this application;

[0024] Figure 4 A front view schematic diagram of an integral plunger rod in at least one embodiment provided in this application;

[0025] Legend:

[0026] Motor 1, Coupling 3, Worm 7, Diaphragm 47, Cylinder liner 42, Connecting rod 20, Eccentric block 21, Worm wheel 23, Slide rod 29, Piston 36, Rod body 361, Retaining ring 362, First locking post 363, Second locking post 364, Locking platform 365, Locking hole 366, Locking groove 367. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0029] Technical means not detailed in this application and not used to solve the technical problems of this application are all set according to common general knowledge in the field, and multiple common general knowledge setting methods can be implemented.

[0030] See Figures 2-4The diaphragm pump provided in this application includes, installed within a housing: an integral plunger rod, a motor 1, a coupling 3, a worm gear 7, a diaphragm 47, a cylinder liner 42, a connecting rod 20, an eccentric block 21, a worm wheel 23, and a slide rod 29; the motor 1, coupling 3, worm gear 7, connecting rod 20, eccentric block 21, and worm wheel 23 are housed within the drive cavity of the housing; the diaphragm 47, integral plunger rod, and cylinder liner 42 are housed within the solution extrusion cavity of the housing; the solution extrusion cavity of the housing is located within the drive cavity of the housing. The moving chamber is connected to the drive chamber of the housing on one side; the motor 1 is driven by the worm gear 7 via the coupling 3; an eccentric block 21 is sleeved on the lower part of the worm gear 7; a connecting rod 20 is sleeved on the eccentric block 21; a slide rod 29 is connected to the outer side of the connecting rod 20; the slide rod 29 is configured to move longitudinally back and forth within the housing, and the extended end of the slide rod 29 is connected to an integrated plunger rod; the integrated plunger rod is housed within the contraction chamber, and the extended end of the integrated plunger rod is driven by the diaphragm 47, with a plunger 36 on the other end. The motor 1 drives the integrated plunger rod to move longitudinally back and forth within the contraction chamber of the housing via the aforementioned drive assembly, thereby driving the diaphragm 47 to repeatedly compress the solution chamber within the contraction chamber, achieving continuous intake and discharge of the medium. All components not detailed in this plunger pump are configured and operated according to existing structures in the art, and will not be elaborated upon here.

[0031] One end of the integrated plunger rod is inserted into the slide rod 29, thereby avoiding the use of plunger locking plates, plunger anti-loosening nuts, and plunger anti-tightening nuts, and preventing breakage caused by uneven local stress.

[0032] The integrated plunger rod includes: a rod body 361, a retaining ring 362, a first locking pin 363, and a second locking pin 364; one end of the rod body 361 is connected to the center of the end face of the plunger 36; the other end of the rod body 361 is provided with a retaining ring 362, a first locking pin 363, and a second locking pin 364; the extended end of the slide rod 29 is recessed to form a mounting hole; a locking groove 367, a locking platform 365, and a locking hole 366 are respectively provided in the mounting hole extending from the end of the mounting hole to the bottom of the hole; the periphery of the retaining ring 362 of the integrated plunger rod is locked in the locking groove 367; the first locking pin 363 of the integrated plunger rod is locked in the locking platform 365; the second locking pin 364 is inserted into the locking hole 366; in order to achieve installation, the slide rod 29 can be a two-half symmetrical rod structure, which is fixedly connected by screws.

[0033] The integrated plunger rod structure eliminates stress concentration caused by journal changes, improves the overall shear strength of the plunger rod, and solves the problem of easy shaft breakage.

[0034] The formula for calculating the shear stress of the shaft is τ = V / A, where τ represents the average shear stress, V represents the shear force on the calculated section, and A represents the area of ​​the calculated section. From the above formula, it can be concluded that when the plunger rod is increased from 6.9 mm to 11.1 mm, the shear resistance increases by approximately 2.6 times.

[0035] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A diaphragm pump, characterized in that, Includes the following components installed in the housing: an integral plunger rod, a motor (1), a worm gear (7), a diaphragm (47), a cylinder liner (42), a connecting rod (20), an eccentric block (21), and a slide rod (29); the motor (1), coupling (3), worm gear (7), connecting rod (20), eccentric block (21), and worm wheel (23) are housed in the drive cavity of the housing. The diaphragm (47), the integrated plunger rod, and the cylinder liner (42) are housed in the solution extrusion chamber of the housing; The solution extrusion chamber of the housing is located on one side of the drive chamber of the housing and is connected to the drive chamber of the housing; The motor (1) and worm gear (7) are driven and connected; the eccentric block (21) is sleeved on the worm gear (7); the connecting rod (20) is sleeved on the eccentric block (21); The plunger (36) is movably housed within the cylinder liner (42); one end of the slide rod (29) is drivenly connected to the connecting rod (20), and the other end is connected to one end of the integral plunger rod; The extension end of the integrated plunger rod is set to drive the diaphragm (47) into contact. The integrated plunger rod includes: a rod body (361), a retaining ring (362), a first locking pin (363), and a second locking pin (364); One end of the rod (361) is connected to the plunger (36), and the other end is provided with a retaining ring (362), a first locking pin (363), and a second locking pin (364); the retaining ring (362), the first locking pin (363), and the second locking pin (364) are installed inside the slide rod (29) and are drivenly connected to the slide rod (29).

2. The diaphragm pump according to claim 1, characterized in that, The mounting end of the slide bar (29) is recessed to provide a mounting groove; the mounting groove is provided with a snap-fit ​​platform (365), a snap-fit ​​hole (366), and a snap-fit ​​groove (367).

3. The diaphragm pump according to claim 2, characterized in that, The retaining ring (362) is engaged in the engagement groove (367); the first engagement post (363) is engaged in the engagement platform (365); and the second engagement post (364) is inserted into the engagement hole (366).

4. The diaphragm pump according to claim 1, characterized in that, include: Coupling (3); Motor (1) is driven by worm (7) through coupling (3).

5. The diaphragm pump according to claim 4, characterized in that, An installation tube is provided on the upper part of the drive cavity of the housing; the coupling (3) is housed in the installation tube; the motor (1) is installed on the installation tube.

6. The diaphragm pump according to claim 1, characterized in that, include: Worm gear (23); worm gear (23) is housed in the drive cavity of the housing; worm gear (23) is sleeved on the lower part of worm (7).

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