A diaphragm pump
By installing one-way valve cores and springs in the inlet and outlet of the diaphragm pump, the problems of diaphragm pump output pressure and production cost are solved, achieving efficient water flow control and cost optimization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TAIZHOU YONGJINLONG PLASTIC IND CO LTD
- Filing Date
- 2025-07-24
- Publication Date
- 2026-06-26
AI Technical Summary
Existing diaphragm pumps have high production costs while increasing output pressure, mainly due to the matching problem between diaphragm deformation requirements and motor shaft spacing.
A one-way valve core is slidably connected in the inlet and outlet holes and pressed against it by a spring. This ensures the stability and sealing of the one-way valve core during diaphragm deformation. The elastic force of the spring controls the direction of water flow, preventing backflow and increasing output pressure.
Without requiring replacement of the diaphragm and motor, the output pressure of the diaphragm pump has been increased, production costs have been reduced, and the stability and high efficiency of the water flow have been ensured.
Smart Images
Figure CN224413829U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of mechanical technology and relates to a diaphragm pump. Background Technology
[0002] A diaphragm pump is a special type of positive displacement pump, commonly used in existing technologies as a water delivery device. It primarily uses the reciprocating movement of a diaphragm to change the volume of the working chamber, utilizing the switching between positive and negative pressure within the chamber to achieve water intake and discharge. For example, a diaphragm pump disclosed in Chinese Patent (Authorization Announcement No.: CN217682205U) uses first / second connecting screws to fix the centers of the first / second diaphragm chambers, the centers of the first / second diaphragms, and the corresponding positions of the diaphragm support. Under the pressure of the first / second working chambers, the corresponding parts of the diaphragm support, fixed by the first / second connecting screws, are constrained and will not deform downwards. This significantly improves the sealing, durability, and deformation resistance of the pump's working chambers without changing the diaphragm support material, preventing pressure loss and leakage between working chambers, and maintaining the pump's efficiency. Even when the diaphragm support is made of plastic, it has sufficient strength, reducing production costs and manufacturing complexity.
[0003] Combined with paragraphs 0107-0112 of the specification and the accompanying drawings in the prior art document. Figure 9 It is understood that by installing inlet check valves in each inlet hole and outlet check valves in each outlet hole, during the inward water intake process, each inlet check valve is in a closed state to prevent leakage of the transported water. During the diaphragm deformation and reset process, each inlet check valve is in a closed state, and each outlet check valve is in an open state to prevent water from flowing back into the inlet chamber through the inlet check valve. Paragraphs 0107 and 0108 of the prior art clearly state that each inlet check valve and each outlet check valve includes a conical connector and a plate-shaped sealing part. The connector is connected to the inlet or outlet hole, so that each inlet check valve and each outlet check valve can maintain its position, and the sealing part achieves one-way sealing of the inlet or outlet hole.
[0004] However, there are actually certain requirements for the hydraulic pressure of water pumped by a diaphragm pump. Based on the aforementioned comparative documents, in order to ensure that the water pressure pumped by the diaphragm pump can be higher, materials with higher ductility are generally selected to make the diaphragm, and materials with higher hardness are used to make the inlet and outlet check valves. The diaphragm, inlet and outlet check valves are then assembled into the diaphragm pump for use. Under negative pressure, the diaphragm deforms more fully, and the elastic deformation of the sealing parts of the inlet and outlet check valves is reduced during water storage. This allows the water to store energy more fully, ensuring that the hydraulic pressure of the pumped water is higher.
[0005] However, the above solution has significant drawbacks. For example, in the comparative document, in order to ensure that the diaphragm can deform sufficiently, more space must be reserved for the deformation of the diaphragm. However, due to the installation requirements of components such as the swing frame and motor, the reserved space cannot meet the deformation requirements of the diaphragm. Therefore, while replacing the diaphragm, the inlet check valve and the outlet check valve, it is often necessary to replace the motor with one with a shorter wheelbase to adapt to the above structure, which results in very high production costs. Summary of the Invention
[0006] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a diaphragm pump. The technical problem this invention aims to solve is: how to increase the output pressure of the diaphragm pump while reducing production costs.
[0007] The objective of this utility model can be achieved through the following technical solution: A diaphragm pump includes a pump casing with an inlet channel and an outlet channel at the top. An elastic diaphragm is fixed to the bottom of the pump casing, forming a cavity inside the casing. A support is fixed above the diaphragm within the cavity of the pump casing. An outlet chamber communicating with the outlet channel and an inlet chamber communicating with the inlet channel are formed between the upper side of the support and the inner wall of the top of the pump casing. The inlet chamber surrounds the outlet chamber, and the two are not interconnected. A water-receiving chamber is formed between the lower side of the support and the diaphragm. An inlet hole and an outlet hole are provided on the support. Both the water inlet and the water outlet are provided through the upper and lower sides of the bracket. The water inlet chamber and the water storage chamber are connected through the water inlet, and the water outlet chamber and the water storage chamber are connected through the water outlet. The water inlet and the water outlet are each slidably connected with a one-way valve core along the axial direction. The one-way valve cores in the water inlet and the one-way valve cores in the water outlet are installed in opposite directions. Both the water inlet and the water outlet are provided with a spring that elastically acts on the one-way valve core. Under the elastic action of the spring, each one-way valve core blocks the corresponding water inlet and water outlet.
[0008] The diaphragm pump disclosed in this application operates by using a motor to drive an elastic deformation of the diaphragm at the bottom of the pump casing. When the diaphragm deforms downwards, the volume of the water chamber within the pump casing increases, generating negative pressure. This negative pressure opens the one-way valve in the inlet, allowing water to flow sequentially through the inlet channel and inlet chamber into the water chamber. Then, the diaphragm deforms upwards under the motor's drive. In this state, the one-way valve in the inlet is forced to close under pressure, while the one-way valve in the outlet is pushed open under pressure, allowing water in the water chamber to be discharged through the outlet chamber. This water is then further discharged under subsequent hydraulic pressure. The water is discharged outward through the outlet channel, thus completing a single pumping cycle of the diaphragm pump. The difference between this application and existing technologies lies in the following: First, the one-way valve core located in the inlet hole is slidably connected within the inlet hole, and the one-way valve core located in the outlet hole is slidably connected within the outlet hole. Furthermore, springs are installed in both the inlet and outlet holes, utilizing the elastic force of the springs to press the one-way valve cores together. This ensures the installation stability of each one-way valve core when the diaphragm pump is stopped. Based on this, through the cooperation of the one-way valve cores and springs, when the diaphragm moves downward, creating a negative pressure in the water chamber, the resulting negative pressure must overcome the elastic force of the springs. The system can move the one-way valve core in the inlet hole, allowing water to enter the water chamber through the inlet hole. Once the water chamber is full, the negative pressure gradually weakens and eventually disappears. In other words, as the negative pressure decreases, the spring force in the inlet hole remains constant. Therefore, under the influence of the spring's elastic force, the one-way valve core in the inlet hole can promptly return to its original position, sealing the inlet hole and preventing water from overflowing from the inlet hole when the diaphragm deforms upwards to reset. Furthermore, when the diaphragm deforms upwards, a one-way valve core is also installed in the outlet hole, and a spring is also installed in the outlet hole to cooperate with the one-way valve core. That is, the upward deformation of the diaphragm pushes... When water is output from the outlet, it needs to overcome the elastic force of the spring in the outlet. The diaphragm must deform upward to a certain extent before it can push open the one-way valve core in the outlet and open the outlet. During this process, the water in the water chamber accumulates sufficient energy due to the compression of the diaphragm, thus ensuring that the water in the water chamber has a higher pressure when discharged through the outlet. This allows the water to flow faster through the outlet chamber into the outlet channel, thereby ensuring a higher output pressure for the diaphragm pump. Based on this, this application does not require replacement of the diaphragm and motor, reducing production costs while ensuring high water pressure output.
[0009] In the aforementioned diaphragm pump, the inlet is a stepped hole with the stepped surface facing downwards, and the outlet is a stepped hole with the stepped surface facing upwards. Each one-way valve core is cylindrical and has a disc-shaped sealing plug at one end along the circumference. Each one-way valve core passes through the corresponding inlet and outlet, and each one-way valve core abuts against the stepped surface of the corresponding inlet and outlet through one side of the sealing plug. The abutment between the sealing plug and the stepped surface ensures the positioning stability of the one-way valve core in the inlet and outlet when they are in the closed state. Combined with the elastic force of the spring, this ensures the sealing performance of the one-way valve core to the inlet and outlet, effectively preventing pressure loss in the water chamber during operation.
[0010] In the aforementioned diaphragm pump, the stepped surfaces of both the inlet and outlet are beveled, and the outer circumferential edge of one side of each sealing plug abuts against the stepped surfaces of the corresponding inlet and outlet. This design reduces the contact area between the sealing plug and the stepped surfaces of the inlet and outlet, thereby increasing the pressure acting on the sealing plug while maintaining the spring's elastic force. This enhances the tightness between the sealing plug and the stepped surfaces, ensuring a proper seal for the inlet and outlet.
[0011] In the aforementioned diaphragm pump, a retainer is fixed in both the inlet and outlet ports. A spring is located between the retainer and the sealing plug, with one end of the spring abutting against the retainer and the other end abutting against the other side of the sealing plug. Specifically, this application installs retainers in the inlet and outlet ports and assembles a spring between the retainer and the one-way valve core. One end of the spring abuts against the retainer, and the other end abuts against the sealing plug, thereby applying pressure to the one-way valve core through the spring, causing the one-way valve core to seal the inlet and outlet ports.
[0012] In the aforementioned diaphragm pump, the retainer is plate-shaped and herringbone-shaped. The retainer has a lower limiting groove, and the sealing plug has an upper limiting groove. The upper end of the spring is embedded in the lower limiting groove, and the lower end is embedded in the upper limiting groove. The herringbone shape of the retainer prevents excessive obstruction of the inlet or outlet water holes, thus preventing water transport from being hindered. Furthermore, the upper and lower limiting grooves limit the upper and lower ends of the spring in the circumferential direction, preventing radial displacement during spring extension and compression.
[0013] In the aforementioned diaphragm pump, the lower limiting groove has a lower protrusion on its bottom wall, and the upper limiting groove has an upper protrusion on its bottom wall. One end of the spring is fitted over the lower protrusion, and the other end is fitted over the upper protrusion. Furthermore, the presence of the upper and lower protrusions ensures more adequate radial limiting of the spring's two ends, thus guaranteeing the spring's positioning stability.
[0014] In the aforementioned diaphragm pump, the top of the support has two annular protrusions, a first protrusion and a second protrusion. The water outlet is formed in the first protrusion, and the water inlet is formed in the second protrusion. The top of the first protrusion has three slots, spaced apart circumferentially along the protrusion. A retainer fixed in the water outlet is engaged in one of the three slots. Similarly, the lower side of the support has three slots corresponding to the bottom of the second protrusion, spaced apart circumferentially along the protrusion. A retainer fixed in the water inlet is engaged in one of the three slots. This ensures stable installation of each retainer, thereby providing stable support for the spring.
[0015] In the aforementioned diaphragm pump, the top of the support has an annular insertion edge, the inlet is located inside the insertion edge, and the outlet is located outside the insertion edge. The inner wall of the pump casing top has an annular insertion groove, and the insertion edge engages within this groove to separate the inlet and outlet chambers. The cooperation between the insertion edge and the groove effectively separates the inlet and outlet chambers, thus preventing the input and output water from interfering with each other.
[0016] In the aforementioned diaphragm pump, there are multiple protrusions, both type 1 and type 2. Multiple type 1 protrusions are formed along the circumference of the support on the inner side of the insertion edge, while multiple type 2 protrusions are spaced apart around the insertion edge along the circumference of the support. The arrangement of multiple type 1 and multiple type 2 protrusions creates multiple inlet holes and multiple outlet holes on the support. Each inlet hole and each outlet hole is equipped with a one-way valve core, a spring, and a retainer. This means that when water is input, it needs to overcome the elastic force of the springs in each inlet hole simultaneously, and when water is output, it also needs to overcome the elastic force of the springs in each outlet hole simultaneously, thereby further improving the water backflow effect and the water output pressure.
[0017] Compared with existing technologies, this diaphragm pump has the following advantages: by slidingly connecting the one-way valve core in the inlet and outlet, and by using springs to press against the one-way valve core in the inlet and outlet, water must overcome the elastic force of the spring before entering and exiting, thus preventing water from overflowing through the inlet when entering, increasing the pressure when exiting, and minimizing the need to replace components such as motors and diaphragms, effectively reducing production costs. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the structure of this diaphragm pump.
[0019] Figure 2 This is a top view of the diaphragm pump.
[0020] Figure 3 yes Figure 2 A sectional view taken along the AA direction and a magnified view of a portion thereof.
[0021] Figure 4 This is a front view of the diaphragm pump.
[0022] Figure 5 yes Figure 4 A sectional view taken along the BB direction.
[0023] Figure 6 This is a schematic diagram of the one-way valve core.
[0024] Figure 7 This is a schematic diagram of the cage structure.
[0025] Figure 8 This is a schematic diagram of the pump casing.
[0026] Figure 9 This is a schematic diagram of the support structure.
[0027] Figure 10 This is a structural schematic diagram of the support structure from another perspective.
[0028] In the diagram, 1. Pump casing; 11. Inlet channel; 12. Outlet channel; 13. Diaphragm; 14. Bracket; 141. Inlet hole; 142. Outlet hole; 143. Protrusion 1; 1431. Slot 1; 144. Protrusion 2; 1441. Slot 2; 145. Insertion edge; 15. Insertion groove; 2. Outlet chamber; 3. Inlet chamber; 4. Water chamber; 5. One-way valve core; 51. Sealing plug; 511. Upper limit groove; 5111. Upper protrusion; 6. Spring; 7. Cage; 71. Lower limit groove; 711. Lower protrusion. Detailed Implementation
[0029] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.
[0030] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 8 , Figure 9 as well as Figure 10As shown, this diaphragm pump includes a pump housing 1 with an open bottom. In addition, it includes a motor housing for mounting a motor. The pump housing 1 is fixed to the upper end of the motor housing with screws, thereby enabling the motor in the motor housing to drive the components in the pump housing 1. An inlet channel 11 and an outlet channel 12 are provided at the top of the pump housing 1. A diaphragm 13 made of elastic material is fixed at the bottom of the pump housing 1. The specific assembly method of the diaphragm 13 can be referred to in prior art document CN217682205U, and will not be repeated in this embodiment. The arrangement of 13 creates a cavity within the pump housing 1. A bracket 14 is fixed within this cavity, above the diaphragm 13. Specifically, the bracket 14 has a ring-shaped insertion edge 145 along its upper circumferential direction, and an insertion groove 15 along its circumferential direction on the inner wall of the top of the pump housing 1. The two are connected by the insertion edge 145 and the insertion groove 15. This securely positions the bracket 14 within the pump housing 1, while simultaneously creating a water chamber 4 within the pump housing 1 between the bracket 14 and the diaphragm 13. Furthermore, the bracket 14 and the inner wall of the top of the pump housing 1 are connected by the insertion edge 145. The presence of the connecting edge 145 creates an inlet chamber 3 that connects to the inlet channel 11 and an outlet chamber 2 that connects to the outlet channel 12 between the support 14 and the inner top wall of the pump casing 1. The inlet chamber 3 surrounds the outlet chamber 2 and the two are not interconnected. The support 14 has four annular protrusions 143 on the inner side of the connecting edge 145 and four annular protrusions 144 on the outer side of the connecting edge 145. Both the first and second protrusions 143 are spaced apart circumferentially along the support 14. Each protrusion 143 has an outlet hole 142 that penetrates the upper and lower sides of the support 14, and each protrusion 144 has an inlet hole 141 that penetrates the upper and lower sides of the support 14. The inlet chamber 3 and the water storage chamber 4 are connected by several inlet holes 141, and the outlet chamber 2 and the water storage chamber 4 are connected by several outlet holes 142. That is to say, water is input through the inlet channel 11, enters the water storage chamber 4 after passing through the inlet chamber 3 and the inlet hole 141 in sequence, and then passes through the outlet hole 142, the outlet chamber 2 in sequence and is finally discharged outward through the outlet channel 12.
[0031] Combination Figure 6 and Figure 7Each inlet hole 141 and each outlet hole 142 is equipped with a one-way valve core 5. Notably, each inlet hole 141 is a stepped hole with the stepped surface facing downwards, and each outlet hole 142 is a stepped hole with the stepped surface facing upwards. Furthermore, the sliding directions of the one-way valve cores 5 in each inlet hole 141 and each outlet hole 142 are opposite. The stepped surfaces of each inlet hole 141 and each outlet hole 142 are inclined, and each one-way valve core 5 is cylindrical. One end of each one-way valve core 5 is formed with a disc-shaped sealing plug 51. Several one-way valve cores 5 are correspondingly slidably connected in each inlet hole 141 and each outlet hole 142. The one-way valve core 5 in the inlet hole 141 abuts against the stepped surface of the inlet hole 141 through one side of the sealing plug 51, and the one-way valve core 5 in the outlet hole 142 also abuts against the stepped surface of the inlet hole 141 through one side of the sealing plug 51. The stepped surface abuts against each other. In each water inlet hole 141 and each water outlet hole 142, there is a retainer 7 that is arranged opposite to the one-way valve core 5. In each water inlet hole 141 and each water outlet hole 142, there is a spring 6 located between the retainer 7 and the one-way valve core 5. One end of the spring 6 abuts against the retainer 7, and the other end abuts against the other side of the sealing plug 51. Under the elastic force of the spring 6, the sealing plug 51 of each one-way valve core 5 can abut against the stepped surface, so that each water inlet hole 141 and each water outlet hole 142 is blocked in one direction.
[0032] Each retainer 7 is plate-shaped and herringbone-shaped. A lower limiting groove 71 is provided on one side of the retainer, and a lower protrusion 711 is provided on the bottom wall of the lower limiting groove 71. An upper limiting groove 511 is provided on the opposite side of the sealing plug 51 and the retainer, and an upper protrusion 5111 is provided on the bottom wall of the upper limiting groove 511. One end of the spring 6 is embedded in the lower limiting groove 71 and sleeved on the lower protrusion 711, and the other end is embedded in the upper limiting groove 511 and sleeved on the upper protrusion 5111.
[0033] Three slots 1431 are provided at the upper end of each protrusion 143. The three slots 1431 are spaced apart along the circumference of the protrusion 143. The retainer 7 located in the water outlet 142 is engaged and fixed with the three slots 1431. Three slots 2441 are provided on the lower side of the bracket 14 corresponding to the lower end of the protrusion 2 144. The three slots 2441 are spaced apart along the circumference of the protrusion 2 144. The retainer 7 located in the water inlet 141 is engaged and fixed with the three slots 2441.
[0034] Working principle: Driven by the motor, the diaphragm 13 deforms upward or downward as the motor operates. When deforming downward, a negative pressure is generated in the water chamber 4 to overcome the elastic force of the springs 6 in each water inlet 141, causing the one-way valve cores 5 in each water inlet 141 to move downward and open the water inlet 141. At this time, water enters from the water inlet channel 11 and sequentially passes through the water inlet chamber 3 and each water inlet 141 into the water chamber 4 until the water chamber 4 is full of water. During this process, the negative pressure in the water chamber 4 continuously decreases, causing the springs 6 to gradually return to their original position. At the same time as the negative pressure in the water chamber 4 disappears, the one-way valve cores 5 in each water inlet 141 are also able to slide upward and return to their original position under the pressure of the springs 6, thereby resealing each water inlet 141 and preventing water in the water chamber 4 from overflowing through each water inlet 141. The water enters the inlet chamber 3, and then, driven by the motor, the diaphragm 13 deforms upward, reducing the volume of the water chamber 4. At this time, the water retained in the water chamber 4 is continuously squeezed, causing the water pressure in the water chamber 4 to gradually increase until the water pressure in the water chamber 4 is greater than the elastic force of the spring 6 in each outlet hole 142. At this time, the one-way valve core 5 in the inlet hole 141 is lifted and moves upward, causing each outlet hole 142 to open. Thus, the water in the water chamber 4 passes through each outlet hole 142 and the outlet chamber in sequence and is finally discharged outward through the outlet channel 12. During this process, the water in the water chamber 4 is continuously squeezed by the diaphragm 13, which allows for effective energy accumulation. When the outlet hole 142 is opened, it can be output outward at a higher flow rate, thus ensuring that the water output pressure of the diaphragm pump is higher.
[0035] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.
[0036] Although this document frequently uses terms such as pump housing 1, inlet channel 11, outlet channel 12, diaphragm 13, bracket 14, inlet hole 141, outlet hole 142, protrusion 143, slot 1431, protrusion 2 144, slot 2 1441, insertion edge 145, insertion groove 15, outlet chamber 2, inlet chamber 3, water chamber 4, one-way valve core 5, sealing plug 51, upper limit groove 511, upper protrusion 5111, spring 6, retainer 7, lower limit groove 71, and lower protrusion 711, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.
Claims
1. A diaphragm pump comprising a pump casing (1) having an inlet channel (11) and an outlet channel (12) at the top, wherein an elastic diaphragm (13) is fixed to the bottom of the pump casing (1) to form a cavity inside the pump casing (1), wherein a bracket (14) is fixed above the diaphragm (13) in the cavity of the pump casing (1), wherein an outlet chamber (2) communicating with the outlet channel (12) and an inlet chamber (3) communicating with the inlet channel (11) are formed between the upper side of the bracket (14) and the inner wall of the top of the pump casing (1), and the inlet chamber (3) surrounds the outlet chamber. (2) The two are set up and not connected to each other. A water-containing chamber (4) is formed between the lower side of the support (14) and the membrane (13). The support (14) is provided with a water inlet (141) and a water outlet (142). The water inlet (141) and the water outlet (142) are both provided through the upper and lower sides of the support (14). The water inlet chamber (3) and the water-containing chamber (4) are connected through the water inlet (141). The water outlet chamber (2) and the water-containing chamber (4) are connected through the water outlet (142). The characteristic is that Both the inlet hole (141) and the outlet hole (142) are axially slidably connected with one-way valve cores (5), and the one-way valve cores (5) in the inlet hole (141) and the outlet hole (142) are installed in opposite directions. Both the inlet hole (141) and the outlet hole (142) are provided with springs (6) that elastically act on the one-way valve cores (5), and under the elastic action of the springs (6), each one-way valve core (5) blocks the corresponding inlet hole (141) and outlet hole (142).
2. The diaphragm pump according to claim 1, characterized in that, The inlet hole (141) is a stepped hole with the stepped surface facing downwards, and the outlet hole (142) is a stepped hole with the stepped surface facing upwards. Each one-way valve core (5) is cylindrical and has a disc-shaped sealing plug (51) at one end along the circumference. Each one-way valve core (5) passes through the corresponding inlet hole (141) and outlet hole (142), and each one-way valve core (5) abuts against the stepped surface of the corresponding inlet hole (141) and outlet hole (142) through one side of the sealing plug (51).
3. The diaphragm pump according to claim 2, characterized in that, The stepped surfaces of the water inlet (141) and the water outlet (142) are both inclined, and the outer edge of one side of each sealing plug (51) abuts against the stepped surfaces of the corresponding water inlet (141) and the water outlet (142).
4. The diaphragm pump according to claim 2 or 3, characterized in that, A retainer (7) is fixed in both the water inlet (141) and the water outlet (142). The spring (6) is located between the retainer (7) and the sealing plug (51), with one end of the spring (6) abutting against the retainer (7) and the other end abutting against the other side of the sealing plug (51).
5. The diaphragm pump according to claim 4, characterized in that, The retainer (7) is plate-shaped and herringbone-shaped. The retainer (7) has a lower limit groove (71) and the sealing plug (51) has an upper limit groove (511). The upper end of the spring (6) is embedded in the lower limit groove (71) and the lower end is embedded in the upper limit groove (511).
6. The diaphragm pump according to claim 5, characterized in that, The lower limiting groove (71) has a lower protrusion (711) on the bottom wall of the groove, and the upper limiting groove (511) has an upper protrusion (5111) on the bottom wall of the groove. One end of the spring (6) is sleeved outside the lower protrusion (711), and the other end is sleeved outside the upper protrusion (5111).
7. The diaphragm pump according to claim 4, characterized in that, The bracket (14) has an annular protrusion 1 (143) and a protrusion 2 (144) at its top. The water outlet (142) is formed in the protrusion 1 (143), and the water inlet (141) is formed in the protrusion 2 (144). The top of the protrusion 1 (143) is provided with three slots 1 (1431), and the three slots 1 (1431) are spaced apart circumferentially along the protrusion 1 (143) to fix it. The retainer (7) in the water outlet (142) is engaged in the three slots (1431). The bracket (14) has three slots (1441) on its lower side corresponding to the bottom of the protrusion (144), and the three slots (1441) are spaced apart along the circumference of the protrusion (144). The retainer (7) fixed in the water inlet (141) is engaged in the three slots (1441).
8. The diaphragm pump according to claim 7, characterized in that, The bracket (14) has an annular insertion edge (145) at the top, the water inlet (141) is located inside the insertion edge (145), the water outlet (142) is located outside the insertion edge (145), and the pump housing (1) has an annular insertion groove (15) on the inner wall of the top. The insertion edge (145) is engaged in the insertion groove (15) to separate the water inlet chamber (3) and the water outlet chamber (2).
9. The diaphragm pump according to claim 8, characterized in that, Both the first protrusion (143) and the second protrusion (144) are a plurality of each. The plurality of the first protrusions (143) are formed circumferentially on the inner side of the insertion edge (145) along the bracket (14), and the plurality of the second protrusions (144) are spaced apart around the insertion edge (145) along the bracket (14).