Diaphragm plunger double-head pump shared by transmission mechanism

Abstract

The utility model relates to a diaphragm plunger double-head pump shared by a transmission mechanism, which comprises a pump shell, a plunger pump head, a diaphragm pump head, a motor, a transmission mechanism and a pump cover, the plunger pump head and the diaphragm pump head are respectively arranged at the front end and the rear end of the pump shell, a plunger pump cavity is arranged inside the plunger pump head, a diaphragm pump cavity is arranged inside the diaphragm pump head, and the motor is arranged on the pump cover. The motor is arranged outside the pump shell, the transmission mechanism is arranged in the pump shell, the pump cover covers the pump shell, the transmission mechanism comprises an eccentric wheel assembly and a swing arm, the eccentric wheel assembly is eccentrically connected to the output end of the motor, the front end of the swing arm is in sliding fit with the interior of the plunger pump cavity, and the rear end of the swing arm is in sliding fit with the interior of the diaphragm pump cavity. And the diaphragm is movably connected with the eccentric wheel assembly. According to the technical scheme, an original transmission mechanism is integrated, so that components are simplified, the manufacturing cost is reduced, fault points are reduced, the overall reliability is improved, installation is more facilitated, and the energy efficiency can also be correspondingly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pump equipment, and more specifically to a diaphragm plunger double-head pump with a common transmission mechanism. Background Art

[0002] A twin-head pump is different from a conventional pump. It has two pump heads, each of which can independently control the flow, pressure and pumping direction, so that it can perform two independent pumping tasks at the same time. By processing two pumping tasks at the same time, the twin-head pump can improve work efficiency, reduce the number of equipment and occupy space.

[0003] Our company applied for a utility model patent with announcement number CN221220718U on April 12, 2023 and was authorized on December 11, 2023. It discloses a diaphragm and plunger double-head pump, which includes a pump body with a transmission cavity, and a front pump cavity and a rear pump cavity mirror-imaged on both sides of the transmission cavity. A motor is provided on the outer wall of the pump body opposite to the transmission cavity. The output end of the motor passes through the transmission cavity. The transmission cavity is provided with a plunger transmission mechanism connected to the output end of the motor and a diaphragm transmission mechanism. Mechanism, the plunger transmission mechanism and the diaphragm transmission mechanism are opposed to each other up and down, and extend to the front pump chamber and the rear pump chamber respectively, the front pump chamber and the rear pump chamber are respectively provided with a plunger pump head assembly and a diaphragm pump head assembly, the plunger pump head assembly and the diaphragm pump head assembly are respectively connected to the plunger transmission mechanism and the diaphragm transmission mechanism, wherein the plunger transmission mechanism includes a main gear, a driven gear, a connecting shaft and a connecting rod assembly, the connecting rod assembly includes a sleeve rod and a first ball bearing, and the diaphragm transmission mechanism includes a diaphragm diaphragm, an eccentric wheel, a crankshaft and a second ball bearing.

[0004] The above-mentioned double-head pump integrates the diaphragm transmission mechanism, diaphragm pump head assembly of the diaphragm pump and the plunger transmission mechanism, plunger pump head assembly of the plunger pump in one pump body. The diaphragm transmission mechanism and the plunger transmission mechanism are driven by the same motor to transport different types of liquids. However, the diaphragm transmission mechanism and the plunger transmission mechanism in the double-head pump structure are two independent mechanisms. Each set of transmission mechanisms contains many components and a complex structure, which not only increases the manufacturing cost of the entire double-head pump, but also means an increase in potential failure points, affecting the overall reliability. At the same time, the size of the pump body is also larger, requiring more installation space. In addition, since there is a certain amount of energy loss during operation of the diaphragm transmission mechanism and the plunger transmission mechanism, energy efficiency is reduced. Utility Model Content

[0005] In view of the above situation, in order to overcome the problem that the diaphragm transmission mechanism and the plunger transmission mechanism in the above-mentioned double-head pump are two independent mechanisms, each set of transmission mechanisms contains many components and complex structure, which results in high manufacturing cost of the pump, increased failure points, and reduced overall reliability. At the same time, the increase in the overall size of the pump is not conducive to installation, and there is also the problem of reduced energy efficiency. The purpose of the present utility model is to provide a diaphragm plunger double-head pump that integrates the original diaphragm transmission mechanism and plunger transmission mechanism into a single transmission mechanism, thereby streamlining the required components, reducing manufacturing costs, reducing failure points, and improving overall reliability. At the same time, it is more conducive to installation and the energy efficiency can be improved accordingly.

[0006] In order to achieve the above purpose, the technical solution of the utility model is:

[0007] A diaphragm plunger double-head pump with a common transmission mechanism, which includes a pump casing, a plunger pump head, a diaphragm pump head, a motor, a transmission mechanism and a pump cover. The plunger pump head is arranged at the front end of the pump casing, and a plunger pump chamber is opened inside it. The diaphragm pump head is arranged at the rear end of the pump casing, and a diaphragm pump chamber is opened inside it. The interior of the pump casing is connected to the plunger pump chamber and the diaphragm pump chamber. The motor is arranged outside the pump casing, the transmission mechanism is arranged in the pump casing, and the pump cover is arranged on the pump casing. The transmission mechanism includes an eccentric wheel assembly and a swing arm. The eccentric wheel assembly is eccentrically connected to the output end of the motor. The front end of the swing arm slides in the plunger pump chamber, and the rear end slides in the diaphragm pump chamber, and is connected to a diaphragm diaphragm, and the swing arm is movably connected to the eccentric wheel assembly.

[0008] Preferably, a matching groove is provided on the outer wall of the swing arm, and the eccentric wheel assembly is embedded in the matching groove.

[0009] Preferably, the eccentric wheel assembly includes an eccentric wheel body and a ball bearing. The eccentric wheel body is eccentrically connected to the output end of the motor. The ball bearing is sleeved on the eccentric wheel and embedded in the matching groove.

[0010] Preferably, both ends of the pump housing are provided with guide wear-resistant sleeves, and the two guide wear-resistant sleeves are provided on the front and rear ends of the swing arm.

[0011] Preferably, a dynamic sealing groove is provided at the front end of the swing arm, a dynamic sealing ring is provided in the dynamic sealing groove, and the dynamic sealing ring has an interference fit with the guide wear-resistant sleeve; a static sealing groove is provided on the plunger pump head, a static sealing ring is provided in the static sealing groove, and the static sealing ring has an interference fit with the guide wear-resistant sleeve; an oil seal is also provided in the plunger pump chamber, and the oil seal has an interference fit with the swing arm.

[0012] Preferably, a threaded hole is provided at the rear end of the swing arm, and a threaded column is formed on the diaphragm, which is threadedly connected to the threaded hole.

[0013] Preferably, the plunger pump head includes a first end cover and a first balance chamber, a first liquid inlet pipe and a first liquid discharge pipe are formed on the outer wall of the first end cover, and a first liquid inlet hole and a first liquid discharge hole are opened inside, a first liquid inlet channel and a first liquid discharge channel are opened in the first balance chamber, the first liquid inlet pipe, the first liquid inlet hole, the first liquid inlet channel and the plunger pump chamber are connected to each other, and the first liquid discharge pipe, the first liquid discharge hole, the first liquid discharge channel and the plunger pump chamber are connected to each other, and a first liquid inlet check valve and a first liquid discharge check valve are respectively provided in the first liquid inlet channel and the first liquid discharge channel.

[0014] Preferably, the first liquid inlet one-way valve includes an inlet valve plate and a first spring, the inlet valve plate is slidably connected to the first liquid inlet channel, and the two ends of the first spring respectively abut against the inlet valve plate and the inner wall of the first liquid inlet hole; the first liquid discharge one-way valve includes a discharge valve plate and a second spring, the discharge valve plate is opposite to the first liquid discharge channel, and the two ends of the second spring respectively abut against the discharge valve plate and the circumferential direction of the first liquid discharge channel.

[0015] Preferably, the diaphragm pump head includes a second end cover and a second balance chamber, a second liquid inlet pipe and a second liquid discharge pipe are formed on the outer wall of the second end cover, and a second liquid inlet hole and a second liquid discharge hole are opened inside, a second liquid inlet channel and a liquid discharge channel are opened in the second balance chamber, the second liquid inlet pipe, the second liquid inlet hole, the second liquid inlet channel and the plunger pump chamber are connected to each other, and the second liquid discharge pipe, the second liquid discharge hole, the second liquid discharge channel and the plunger pump chamber are connected to each other, and a second liquid inlet check valve and a second liquid discharge check valve are respectively provided in the second liquid inlet channel and the second liquid discharge channel.

[0016] Preferably, a filter cavity is provided on the outer wall of the second end cover, the filter cavity is communicated with the second liquid inlet, a sintered filter screen is provided in the filter cavity, and the filter cavity is sealed by a sealing cover.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] The diaphragm plunger double-head pump of the utility model can simultaneously control the liquid inlet and pumping of the plunger pump head and the diaphragm pump head through a set of transmission mechanisms, thereby streamlining the number of transmission mechanisms and reducing energy loss during operation, thereby improving energy efficiency. Moreover, the transmission mechanism is only composed of an eccentric wheel group and a swing arm, which makes the structure relatively simple. It not only reduces the manufacturing cost of the entire double-head pump, but also reduces the number of potential failure points, thereby improving the overall reliability. At the same time, it can also reduce the installation space occupied during installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of the double-head pump of the utility model;

[0020] Figure 2 This is a schematic structural diagram of the double-head pump of the utility model when the pump cover is separated from the pump body;

[0021] Figure 3 This is a schematic diagram of the structure of the double-head pump of the utility model when the pump cover and the pump body are separated at the same time;

[0022] Figure 4 This is a structural diagram of the double-head pump of the utility model when the pump cover, transmission mechanism, plunger pump head and diaphragm pump head are separated from the pump body at the same time;

[0023] Figure 5 This utility model Figure 1 Schematic diagram of the enlarged structure of the AA part;

[0024] Figure 6 This is a schematic diagram of the structure of the double-head pump of the utility model when the plunger pump head is disassembled;

[0025] Figure 7 This is a schematic diagram of the overall structure of the first end cover of the plunger pump head of the double-head pump of the utility model;

[0026] Figure 8 This is a schematic diagram of the structure of the utility model double-head pump diaphragm pump head when it is disassembled;

[0027] Figure 9 It is a schematic diagram of the overall structure of the second end cover of the diaphragm pump head of the double-head pump of the utility model.

[0028] As shown in the figure:

[0029] 1. Pump housing; 2. Plunger pump head; 201. First end cap; 201a. First liquid inlet pipe; 201b. First liquid outlet pipe; 201c. First liquid inlet hole; 201d. First liquid outlet hole; 202. First balancing chamber; 202a. Plunger pump chamber; 202b. Static sealing groove; 202c. First liquid inlet channel; 202d. First liquid outlet channel; 3. Diaphragm pump head; 301. Second end cap; 301a. Second liquid inlet pipe; 301b. Second liquid outlet pipe; 301c. Second liquid inlet hole; 301d. Second liquid outlet hole; 301e. Filter chamber; 302. Second balancing chamber; 302a. Diaphragm pump chamber; 302b. Second liquid inlet channel; 302c. Second liquid outlet channel 1. Pump cover; 2. Pump housing; 3. Pump housing; 4. Motor; 5. Transmission mechanism; 501. Eccentric wheel assembly; 501a. Eccentric wheel body; 501b. Ball bearing; 502. Swing arm; 502a. Fitting groove; 502b. Dynamic sealing groove; 502c. Threaded hole; 6. Pump cover; 7. Diaphragm; 701. Threaded column; 8. Guide wear-resistant sleeve; 9. Dynamic sealing ring; 10. Static sealing ring; 11. Oil seal; 12. First liquid inlet check valve; 1201. Liquid inlet valve disc; 1202. First spring; 13. First liquid discharge check valve; 1301. Liquid discharge valve disc; 1302. Second spring; 14. Second liquid inlet check valve; 15. Second liquid discharge check valve; 16. Sintered filter screen; 17. Sealing cover. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or the directions or positional relationships in which the product of the present invention is usually placed when in use. They are only for the convenience of simplifying the description, and do not indicate or imply that the directions are specific directions that must be possessed, or specific direction structures and operations, and therefore should not be understood as limitations on the present invention.

[0032] like Figures 1 to 5As shown, the utility model relates to a diaphragm plunger double-head pump with a common transmission mechanism, which is consistent with the existing diaphragm plunger double-head pump in that it includes a pump casing 1, a plunger pump head 2, a diaphragm pump head 3, a motor 4, a transmission mechanism 5 and a pump cover 6, wherein the plunger pump head 2 is arranged at the front end of the pump casing 1, and a plunger pump cavity 202a is opened inside it, and the diaphragm pump head 3 is arranged at the rear end of the pump casing 1, and a diaphragm pump cavity 302a is opened inside it, and the pump casing 1 has an opening, which connects the interior of the pump casing 1 with the external space, and the interior of the pump casing 1 is connected with the plunger pump cavity 202a and the diaphragm pump cavity 302a at the same time, and the motor 4 is arranged The transmission mechanism 5 is arranged on the outside of the pump casing 1, the output end of the motor 4 passes through the interior of the pump casing 1, the transmission mechanism 5 is arranged in the pump casing 1, the pump cover 6 is arranged on the opening of the pump casing 1, and is detachably fixed to the pump casing 1 by threaded fasteners, so that the pump casing 1 can be opened easily and the transmission mechanism 5 can be maintained and repaired when necessary; in particular, the transmission mechanism 5 includes an eccentric wheel assembly 501 and a swing arm 502, the eccentric wheel assembly 501 is eccentrically connected to the output end of the motor 4, and is eccentrically rotated by the rotation drive of the output end of the motor 4, the front end of the swing arm 502 is slidably fitted in the plunger pump chamber 202a, and the rear end is slidably fitted in the plunger pump chamber 202a. The diaphragm 7 is connected to the diaphragm pump chamber 302a, that is, the swing arm 502 cooperates with the piston between the plunger pump head 2 and the diaphragm pump head 3 at the same time, and the swing arm 502 is movably connected to the eccentric wheel assembly 501 at the same time. The eccentric rotation of the eccentric wheel assembly 501 driven by the motor 4 pushes the swing arm 502 to swing back and forth. The two ends of the swing arm 502 simultaneously perform piston motion in the plunger pump chamber 202a and the diaphragm pump chamber 302a. The swing arm 502 changes the volume of the plunger pump chamber 202a through its front end to feed and pump liquid, and pulls the diaphragm 7 back and forth through its rear end to make The volume of the diaphragm pump chamber 302a is constantly changing, and liquid is introduced and pumped. The diaphragm plunger double-head pump of the utility model can simultaneously control the liquid introduction and pumping of the plunger pump head 2 and the diaphragm pump head 3 through a set of transmission mechanisms 5, which simplifies the number of transmission mechanisms 5 and can reduce energy losses during operation, thereby improving energy efficiency. The transmission mechanism 5 is only composed of an eccentric wheel assembly 501 and a swing arm 502, which makes the structure relatively simple. It not only reduces the manufacturing cost of the entire double-head pump, but also reduces the number of potential failure points, thereby improving overall reliability. At the same time, it can also reduce the installation space occupied during installation.

[0033] like Figures 3 to 5As shown, a matching groove 502a is provided on the outer wall of the swing arm 502, and the eccentric wheel assembly 501 is embedded in the matching groove 502a. In the embedded state, when the motor 4 is running and the eccentric wheel assembly 501 rotates eccentrically, it can drive the swing arm 502 to swing back and forth, so that the two ends of the swing arm 502 perform piston motion in the plunger pump chamber 202a and the diaphragm pump chamber 302a at the same time. It should be mentioned that since the front and rear ends of the swing arm 502 are supported by the plunger pump chamber 202a and the diaphragm pump chamber 302a respectively, it can maintain balance by simply plugging and fitting with the eccentric wheel assembly 501, thereby eliminating the need for additional connectors, further simplifying the structure of the transmission mechanism 5.

[0034] like Figures 3 to 5 As shown, the eccentric wheel assembly 501 consists of an eccentric wheel body 501a and a ball bearing 501b. The eccentric wheel body 501a is eccentrically connected to the output end of the motor 4, and the ball bearing 501b is mounted on the eccentric wheel and embedded in the matching groove 502a. At this time, the main roller bearing contacts the matching groove 502a through the outer ring. The above setting is connected to the output end of the motor 4 through the eccentric wheel body 501a through the eccentric wheel assembly 501, is directly driven by the motor 4, and is embedded in the matching groove 502a of the swing arm 502 through the ball bearing 501b and contacts the matching groove 502a, thereby reducing the wear of the eccentric wheel body 501a during high-speed eccentric rotation, protecting the eccentric wheel body 501a, improving the overall service life of the double-head pump, and reducing the possibility of rotation jamming.

[0035] like Figure 4 and Figure 5 As shown, both ends of the pump housing 1 are provided with guide wear-resistant sleeves 8, and the two guide wear-resistant sleeves 8 are mounted on the front and rear ends of the swing arm 502. The guide wear-resistant sleeves 8 are used to guide the direction of movement of the swing arm 502, ensuring that the swing arm 502 maintains a linear reciprocating swing, and ensuring that the liquid inlet and pumping actions of the plunger pump head 2 and the diaphragm pump head 3 are not affected.

[0036] like Figures 4 to 6As shown, a dynamic sealing groove 502b is provided at the front end of the swing arm 502, and the dynamic sealing groove 502b is an annular groove body, and is opposite to the inner wall of the guide wear-resistant sleeve 8 at the front end of the swing arm 502. A dynamic sealing ring 9 is sleeved in the dynamic sealing groove 502b, and the dynamic sealing ring 9 is interference fit with the guide wear-resistant sleeve 8. A static sealing groove 202b is provided on the plunger pump head 2, and a static sealing ring 10 is sleeved in the static sealing groove 202b, and the static sealing ring 10 is interference fit with the guide wear-resistant sleeve 8. An oil seal 11 is also provided in the plunger pump chamber 202a, and the oil seal 11 is interference fit with the swing arm 502. The above arrangement forms multiple sealing positions between the swing arm 502 and the plunger pump chamber 202a of the plunger pump head 2 through the dynamic sealing ring 9, the static sealing ring 10 and the oil seal 11, so that the overall sealing performance of the plunger pump head 2 is significantly improved, the possibility of liquid leakage is reduced, and the working efficiency of the plunger pump head 2 is improved.

[0037] like Figure 5 and Figure 8 As shown, a threaded hole 502c is provided at the rear end of the swing arm 502, and a threaded column 701 is formed on the diaphragm 7. The threaded column 701 is threadedly connected to the threaded hole 502c. The threaded connection is a detachable connection method, which is not only convenient for replacing the diaphragm 7 when it is damaged, but also can utilize its self-locking property to prevent it from falling off due to high-speed reciprocating stretching, so that the diaphragm 7 is firmly connected to the rear end of the swing arm 502.

[0038] like Figure 6 and Figure 7As shown, the plunger pump head 2 includes a first end cover 201 and a first balance chamber 202. A first liquid inlet pipe 201a and a first liquid discharge pipe 201b are formed on the outer wall of the first end cover 201. The first liquid inlet pipe 201a and the first liquid discharge pipe 201b are used for liquid inlet and liquid discharge of the plunger pump head 2, respectively. A first liquid inlet hole 201c and a first liquid discharge hole 201d are opened inside the first end cover 201. A first liquid inlet channel 202c is opened in the first balance chamber 202. The first liquid inlet pipe 201a, the first liquid inlet hole 201c, the first liquid inlet flow channel 202c and the plunger pump chamber 202a are connected to each other to form a liquid inlet channel, and the first liquid discharge pipe 201b, the first liquid discharge hole 201d, the first liquid discharge flow channel 202d and the plunger pump chamber 202a are connected to each other to form a liquid discharge channel, and the first liquid inlet flow channel 202c and the first liquid discharge channel are respectively provided with a first liquid inlet check valve 12 and a first liquid discharge check valve 12. One-way valve 13, when the dual-head pump is not running, the first liquid inlet flow channel 202c and the first liquid discharge flow channel 202d are respectively closed by the first liquid inlet one-way valve 12 and the first liquid discharge one-way valve 13, thereby isolating the liquid inlet channel and the liquid discharge channel respectively. When the volume of the plunger pump chamber 202a of the plunger pump head 2 expands during the movement of the piston at the front end of the swing arm 502, the first liquid inlet one-way valve 12 moves and opens the liquid inlet channel. At this time, the liquid can pass through the first liquid inlet pipe 201 in sequence. a. The first liquid inlet hole 201c and the first liquid inlet channel 202c enter the plunger pump chamber 202a. When the volume of the plunger pump chamber 202a decreases, the first liquid discharge one-way valve 13 is pushed to move under the action of liquid pressure to open the liquid discharge channel, and at the same time, the first liquid inlet one-way valve 12 is moved back to close the first liquid inlet channel again. At this time, the liquid in the plunger pump chamber 202a can be pumped to the outside through the first liquid discharge channel, the first liquid discharge hole 201d and the first liquid discharge pipe 201b in sequence.

[0039] like Figure 6As shown, the first liquid inlet one-way valve 12 includes a liquid inlet valve plate 1201 and a first spring 1202. The liquid inlet valve plate 1201 is slidably connected to the first liquid inlet channel 202c. The liquid inlet valve plate 1201 opens or closes the first liquid inlet channel 202c by sliding. The two ends of the first spring 1202 respectively abut against the liquid inlet valve plate 1201 and the inner wall of the first liquid inlet hole 201c, and use its own elastic force to support the liquid inlet valve plate 1201; the first liquid discharge one-way valve 13 includes a liquid discharge valve plate 1301 and a second spring 1302. The liquid discharge valve plate 1301 is opposite to the first liquid discharge channel 202d, that is, the liquid discharge valve plate 1301 and the first liquid discharge channel 202d maintain a gap, and the two ends of the second spring 1302 respectively abut against the liquid discharge valve plate 1301 and the circumferential direction of the first liquid discharge channel 202d. The discharge valve disc 1301 is supported by the second spring 1302 so that it maintains a distance from the first discharge flow channel 202d in a natural state. Preferably, the first spring 1202 and the second spring 1302 are pagoda springs, thereby providing more stable support for the inlet valve disc 1201 and the discharge valve disc 1301 respectively. The first inlet check valve 12 composed of the inlet valve disc 1201 and the first spring 1202, and the second inlet check valve 14 composed of the discharge valve disc 1301 and the second spring 1302 replace the umbrella valve. When liquid is inlet and pumped, the elastic force of the first spring 1202 and the second spring 1302 is used to drive the opening and closing of the inlet valve disc 1201 and the discharge valve disc 1301 respectively, thereby reducing leakage problems caused by problems such as material hardening of the umbrella valve, thereby achieving better reliability.

[0040] like Figure 8 and Figure 9As shown, the diaphragm pump head 3 includes a second end cover 301 and a second balance chamber 302. A second liquid inlet pipe 301a and a second liquid discharge pipe 301b are formed on the outer wall of the second end cover 301. The second liquid inlet pipe 301a and the second liquid discharge pipe 301b are used for liquid inlet and liquid discharge of the plunger pump head 2, respectively. A second liquid inlet hole 301c and a second liquid discharge hole 301d are opened inside the second end cover 301. A second liquid inlet flow channel 302b and a second liquid discharge flow channel are opened in the second balance chamber 302. 302c, the second liquid inlet pipe 301a, the second liquid inlet hole 301c, the second liquid inlet flow channel 302b and the diaphragm pump chamber 302a are connected to each other to form a liquid inlet channel, and the second liquid discharge pipe 301b, the second liquid discharge hole 301d, the second liquid discharge flow channel 302c and the diaphragm pump chamber 302a are connected to each other to form a liquid discharge channel, and the second liquid inlet flow channel 302b and the second liquid discharge channel are respectively provided with a second liquid inlet check valve 14 and a second liquid discharge check valve 15. In the present utility model, the second The inlet one-way valve 14 and the second discharge one-way valve 15 are both umbrella valves. When the dual-head pump is not running, the second inlet flow channel 302b and the second discharge flow channel 302c are respectively closed by the second inlet one-way valve 14 and the second discharge one-way valve 15, thereby isolating the inlet channel and the discharge channel respectively. When the diaphragm pump chamber 302a of the diaphragm pump head 3 expands in volume during the movement of the piston at the front end of the swing arm 502, the second inlet one-way valve 14 moves and opens the inlet channel. At this time, the liquid can pass through the second inlet one-way valve 14 and the second discharge one-way valve 15 in sequence. The second liquid inlet pipe 301a, the second liquid inlet hole 301c, and the second liquid inlet channel 302b enter the diaphragm pump chamber 302a. When the volume of the diaphragm pump chamber 302a decreases, the second liquid discharge one-way valve 15 is pushed to move under the action of liquid pressure to open the liquid discharge channel, and at the same time, the second liquid inlet one-way valve 14 is moved back to close the second liquid inlet channel again. At this time, the liquid in the plunger pump chamber 202a can be pumped to the outside through the second liquid discharge channel, the second liquid discharge hole 301d and the second liquid discharge pipe 301b in sequence.

[0041] like Figure 8 and Figure 9As shown, a filter chamber 301e is provided on the outer wall of the second end cover 301, and the filter chamber 301e is connected to the second liquid inlet hole 301c, thereby dividing the second liquid inlet hole 301c into two sections. When the diaphragm pump head 3 is filled with liquid, the liquid first enters a section of the second liquid inlet hole 301c close to the second liquid inlet pipe 301a after passing through the second liquid inlet pipe 301a, and then enters the other section of the second liquid inlet hole 301c after passing through the filter chamber 301e. A sintered filter screen 16 is provided in the filter chamber 301e. The sintered filter screen 16 can directly filter the liquid that will subsequently enter the diaphragm pump chamber 302a. That is to say, when the liquid enters the filter chamber 301e and passes through the sintered filter screen 16, the particles or impurities contained therein are filtered out. The liquid is retained on one side of the sintered filter 16, and enters the other side of the second liquid inlet 301c through the sintered filter 16 and the filter chamber 301e, and finally enters the diaphragm pump chamber 302a, thereby filtering the liquid and preventing the particles or impurities contained in the liquid from causing wear and corrosion to the internal components when the liquid is transported to the diaphragm pump liquid chamber, and effectively preventing blockage, so that the entire diaphragm pump head 3 can maintain normal operation for a long time, thereby improving the operating performance and service life. In addition, the filter chamber 301e is closed by the sealing cover 17 to avoid leakage during the liquid inlet process. The sealing cover 17 and the second end cover 301 are fixed by threaded fasteners, thereby facilitating the disassembly and assembly of the sealing cover 17, so as to facilitate replacement of the sintered filter 16.

[0042] Combine Figures 1 to 9When the diaphragm plunger double-head pump of the present invention is in operation, the output end of the motor 4 drives the eccentric wheel body 501a of the eccentric wheel assembly 501 to rotate eccentrically. The eccentric wheel body 501a transmits the action to the swing arm 502 through the ball bearing 501b synchronously embedded in the matching groove 502a of the swing arm 502. The ball bearing 501b pushes the swing arm 502 to swing back and forth. The two ends of the swing arm 502 simultaneously perform piston motion in the plunger pump chamber 202a and the diaphragm pump chamber 302a. The guide wear-resistant sleeve 8 guides the swing arm 502 to always keep moving in a straight line. The swing arm 502 makes the plunger pump chamber 202a move in a straight line through its front end. The volume of 02a changes continuously, and liquid is introduced and pumped, and the diaphragm 7 is pulled back and forth by its rear end, so that the volume of the diaphragm pump chamber 302a changes continuously, and liquid is introduced and pumped. When the plunger pump head 2 introduces liquid, a negative pressure is formed in the plunger pump chamber 202a to overcome the elastic force of the first spring 1202 of the first liquid inlet check valve 12, so that the liquid inlet valve plate 1201 moves to open the first liquid inlet channel 202c. At this time, the liquid can enter the plunger pump chamber 202a through the first liquid inlet pipe 201a, the first liquid inlet hole 201c, and the first liquid inlet channel 202c in sequence. When pumping liquid, it is pushed under the action of liquid pressure. The first liquid discharge one-way valve 13 moves and squeezes the second spring 1302 to open the liquid discharge channel. At the same time, the liquid inlet valve plate 1201 of the first liquid inlet one-way valve 12 pushes the second spring 1302 to accelerate its recovery deformation to close the first liquid inlet channel again. At this time, the liquid in the plunger pump chamber 202a can be pumped to the outside through the first liquid discharge channel, the first liquid discharge hole 201d and the first liquid discharge pipe 201b in sequence. When the diaphragm pump head 3 is filled with liquid, the second liquid inlet one-way valve 14 moves and opens the second liquid inlet channel 302b. At this time, the liquid can pass through the second liquid inlet pipe 301a in sequence and enter the second liquid inlet. The hole 301c is close to a section of the second liquid inlet pipe 301a, and then enters the filter chamber 301e and is filtered by the sintered filter mesh 16. After filtration, the liquid enters the other section of the second liquid inlet hole 301c, and enters the diaphragm pump chamber 302a through the second liquid inlet channel 302b. When pumping liquid, the second liquid discharge one-way valve 15 is pushed to move to open the liquid discharge channel under the action of liquid pressure, and at the same time, the second liquid inlet one-way valve 14 is moved back to close the second liquid inlet channel again. At this time, the liquid in the plunger pump chamber 202a can be pumped to the outside through the second liquid discharge channel, the second liquid discharge hole 301d and the second liquid discharge pipe 301b in sequence.

[0043] The above embodiments and descriptions are only for explaining the principle and best embodiment of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements shall fall within the scope of the present invention to be protected.

Claims

1. A diaphragm plunger double-head pump with a common transmission mechanism, comprising a pump housing (1), a plunger pump head (2), a diaphragm pump head (3), a motor (4), a transmission mechanism (5) and a pump cover (6), wherein the plunger pump head (2) is arranged at the front end of the pump housing (1), and a plunger pump chamber (202a) is provided in the interior thereof, the diaphragm pump head (3) is arranged at the rear end of the pump housing (1), and a diaphragm pump chamber (302a) is provided in the interior thereof, the interior of the pump housing (1) is communicated with the plunger pump chamber (202a) and the diaphragm pump chamber (302a), the motor (4) is arranged outside the pump housing (1), the transmission mechanism (5) is arranged in the pump housing (1), and the pump cover (6) is provided on the pump housing (1), characterized in that: The transmission mechanism (5) comprises an eccentric wheel assembly (501) and a swing arm (502), wherein the eccentric wheel assembly (501) is eccentrically connected to the output end of the motor (4), the front end of the swing arm (502) is slidably fitted in the plunger pump cavity (202a), and the rear end is slidably fitted in the diaphragm pump cavity (302a), and is connected to a diaphragm (7), and the swing arm (502) is movably connected to the eccentric wheel assembly (501).

2. A diaphragm plunger double-head pump with a common transmission mechanism according to claim 1, characterized in that: A matching groove (502a) is provided on the outer wall of the swing arm (502), and the eccentric wheel assembly (501) is embedded in the matching groove (502a).

3. A diaphragm plunger double-head pump with a common transmission mechanism according to claim 2, characterized in that: The eccentric wheel assembly (501) comprises an eccentric wheel body (501a) and a ball bearing (501b), wherein the eccentric wheel body (501a) is eccentrically connected to the output end of the motor (4), and the ball bearing (501b) is sleeved on the eccentric wheel and embedded in the matching groove (502a).

4. A diaphragm plunger double-head pump with a common transmission mechanism according to any one of claims 1 to 3, characterized in that: Guide wear-resistant sleeves (8) are provided at both ends of the pump housing (1), and the two guide wear-resistant sleeves (8) are sleeved on the front and rear ends of the swing arm (502).

5. A diaphragm plunger double-head pump with a common transmission mechanism according to claim 4, characterized in that: The front end of the swing arm (502) is provided with a dynamic sealing groove (502b), a dynamic sealing ring (9) is sleeved in the dynamic sealing groove (502b), and the dynamic sealing ring (9) is interference-fitted with the guide wear-resistant sleeve (8); the plunger pump head (2) is provided with a static sealing groove (202b), a static sealing ring (10) is sleeved in the static sealing groove (202b), and the static sealing ring (10) is interference-fitted with the guide wear-resistant sleeve (8); an oil seal (11) is further provided in the plunger pump chamber (202a), and the oil seal (11) is interference-fitted with the swing arm (502).

6. A diaphragm plunger double-head pump with a common transmission mechanism according to claim 5, characterized in that: A threaded hole (502c) is provided at the rear end of the swing arm (502), and a threaded column (701) is formed on the diaphragm (7), and the threaded column (701) is threadedly connected to the threaded hole (502c).

7. A diaphragm plunger double-head pump with a common transmission mechanism according to any one of claims 1, 2, 3, 5 or 6, characterized in that: The plunger pump head (2) comprises a first end cover (201) and a first balance chamber (202); a first liquid inlet pipe (201a) and a first liquid outlet pipe (201b) are formed on the outer wall of the first end cover (201), and a first liquid inlet hole (201c) and a first liquid outlet hole (201d) are provided inside the first balance chamber (202); a first liquid inlet flow channel (202c) and a first liquid outlet flow channel (202d) are provided in the first balance chamber (202); The liquid inlet pipe (201a), the first liquid inlet hole (201c), the first liquid inlet flow channel (202c) and the plunger pump chamber (202a) are in communication with each other, and the first liquid discharge pipe (201b), the first liquid discharge hole, the first liquid discharge flow channel (202d) and the plunger pump chamber (202a) are in communication with each other, and a first liquid inlet one-way valve (12) and a first liquid discharge one-way valve (13) are respectively provided in the first liquid inlet flow channel (202c) and the first liquid discharge channel.

8. A diaphragm plunger double-head pump with a common transmission mechanism according to claim 7, characterized in that: The first liquid inlet one-way valve (12) comprises a liquid inlet valve plate (1201) and a first spring (1202), wherein the liquid inlet valve plate (1201) is slidably connected to the first liquid inlet flow channel (202c), and the two ends of the first spring (1202) respectively abut against the liquid inlet valve plate (1201) and the inner wall of the first liquid inlet hole (201c); the first liquid discharge one-way valve (13) comprises a liquid discharge valve plate (1301) and a second spring (1302), wherein the liquid discharge valve plate (1301) is opposite to the first liquid discharge flow channel (202d), and the two ends of the second spring (1302) respectively abut against the liquid discharge valve plate (1301) and the first liquid discharge flow channel (202d) in a circumferential direction.

9. A diaphragm plunger double-head pump with a common transmission mechanism according to any one of claims 1, 2, 3, 4, 6 or 8, characterized in that: The diaphragm pump head (3) comprises a second end cover (301) and a second balance chamber (302); a second liquid inlet pipe (301a) and a second liquid discharge pipe (301b) are formed on the outer wall of the second end cover (301), and a second liquid inlet hole (301c) and a second liquid discharge hole (301d) are opened inside; a second liquid inlet flow channel (302b) and a second liquid discharge flow channel (302c) are opened in the second balance chamber (302); the second liquid inlet pipe (301a) and the second liquid discharge pipe (301b) are formed on the outer wall of the second end cover (301), and a second liquid inlet hole (301c) and a second liquid discharge hole (301d) are opened inside the second balance chamber (302); (301a), the second liquid inlet hole (301c), the second liquid inlet channel (302b) and the plunger pump chamber (202a) are in communication with each other, and the second liquid discharge pipe (301b), the second liquid discharge hole (301d), the second liquid discharge channel (302c) and the plunger pump chamber (202a) are in communication with each other, and a second liquid inlet one-way valve (14) and a second liquid discharge one-way valve (15) are provided in the second liquid inlet channel (302b) and the second liquid discharge channel, respectively.

10. A diaphragm plunger double-head pump with a common transmission mechanism according to claim 9, characterized in that: A filter cavity (301e) is provided on the outer wall of the second end cover (301), the filter cavity (301e) is communicated with the second liquid inlet (301c), a sintered filter screen (16) is provided in the filter cavity (301e), and the filter cavity (301e) is sealed by a sealing cover (17).

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