A bidirectional non-return diaphragm pump with an expansion pressure relief structure and an operating method thereof

Abstract

The present invention relates to a bidirectional non-return diaphragm pump with an expansion pressure relief structure and an operating method thereof. A return liquid hole opposite to the drainage channel and the water inlet chamber is provided on the non-return seat of the diaphragm pump. A return liquid pipe extending into the water inlet chamber is formed circumferentially of the return liquid hole. A pressure relief sleeve is formed on the lower sealing gasket and is sleeved on the return liquid pipe. The water outlet end of the return liquid pipe is closed by the pressure relief sleeve. A pressure relief port is provided on the pressure relief sleeve. The pressure relief port is misaligned with the water outlet end of the return liquid pipe. The technical solution does not require the addition of additional accessories and has its own pressure relief structure, thereby greatly optimizing the production cost. At the same time, the assembly process is not changed, thereby avoiding an increase in the complexity and difficulty of the assembly process.

Description

Technical Field

[0001] The present invention relates to the technical field of diaphragm pumps, and more particularly to a bidirectional non-return diaphragm pump with an expansion and pressure relief structure and an operating method thereof. Background Art

[0002] Diaphragm pumps are common pumps that use a diaphragm structure to draw in and discharge liquids by compressing and relaxing the diaphragm. Diaphragm pumps have self-priming capabilities and can transport a variety of media, including high-concentration, high-viscosity, volatile, highly corrosive, and particulate-containing media. They are widely used in many industries, including chemical, environmental protection, food, and medicine.

[0003] When installing a traditional diaphragm pump, a pressure relief valve is often installed at the water outlet channel for pressure relief protection. When the water outlet channel is blocked or cannot be drained normally due to other reasons, the sealing water pressure of the accumulated liquid in the water outlet channel is reduced to avoid the continuous increase of the sealing water pressure, thereby protecting the motor and front-end accessories. The problem caused by the above setting method is that first, the addition of an independent pressure relief valve increases the cost of the entire fluid conveying system. In the case of large-scale applications, it causes a huge increase in production costs. Secondly, due to the additional step of installing the pressure relief valve, the installation process is prolonged and more difficult, affecting the installation efficiency of the entire fluid conveying system. Finally, the pressure relief valve also takes up space and increases the volume of the configured product.

[0004] In this regard, the Chinese patent with publication number CN216008837U and patent name "Micro diaphragm pump with pressure relief structure" discloses a new type of diaphragm pump, which includes a base, a partition, an upper cover and a pipe fitting. A water cavity is provided between the base and the partition, and an inlet pipe and an outlet pipe are provided on the upper cover. The two ends of the pipe fitting are respectively in contact with the inner walls of the upper cover and the partition, and the pipe fitting divides the space between the partition and the upper cover into a first tube cavity and a second tube cavity. One end of the first tube cavity and the second tube cavity can be connected to the water outlet. The pipe and the water inlet pipe, the other ends of the first pipe cavity and the second pipe cavity are connected to the water cavity, an elastic ring and a plurality of pressure relief holes are provided on the pipe fitting, the pressure relief holes can connect the first pipe cavity and the second pipe cavity, and the plurality of pressure relief holes are circumferentially arranged on the peripheral wall of the pipe fitting, the elastic ring is sleeved on the pipe fitting and covers the plurality of pressure relief holes, the pipe fitting includes an annular recess, the plurality of pressure relief holes are all provided on the annular recess, the elastic ring is sleeved on the annular recess, a first sealing ring is provided between one end of the pipe fitting and the partition, and a second sealing ring is provided between the upper cover and the partition.

[0005] The diaphragm pump of the above structure utilizes an elastic ring fitted over a pipe fitting to cover the pressure relief hole. The elastic force generated by the deformation of the elastic ring tightly seals the pressure relief hole. When the sealing water pressure in the outlet pipe exceeds the elastic force exerted by the elastic ring, a gap appears between the elastic ring and the pressure relief hole. At this time, the water in the outlet pipe can be discharged from the pressure relief hole into the first and second lumens, thereby achieving pressure relief. Unlike traditional diaphragm pumps, this diaphragm pump has its own pressure relief structure, eliminating the need for an additional pressure relief valve for pressure relief. Therefore, the configured product volume can be minimized, and the pressure relief valve installation process and the installation difficulty caused by installing the pressure relief valve are simplified. However, there is still a problem that the elastic ring and pipe fitting are not structures found in traditional diaphragm pumps and are newly added accessories, resulting in a higher production cost than traditional diaphragm pumps. Mass production will also cause a significant increase in production costs. In addition, the newly added accessories cause the diaphragm pump to undergo significant changes based on the structure of traditional diaphragm pumps, which correspondingly changes the assembly process and significantly differs from traditional diaphragm pumps, resulting in a different degree of complexity and difficulty in the assembly process. Summary of the Invention

[0006] In view of the above situation, in order to overcome the problem that the diaphragm pump with its own pressure relief structure adds many accessories compared to the traditional diaphragm pump, resulting in a higher production cost than the traditional diaphragm pump, and will cause changes in the assembly process and be significantly different from the traditional diaphragm pump, resulting in a different increase in the complexity and difficulty of the assembly process, the purpose of the present invention is to provide a diaphragm pump with its own pressure relief structure without the need for additional accessories, thereby greatly optimizing the production cost, and at the same time, without changing the assembly process, avoiding the increase in the complexity and difficulty of the assembly process and its operating method.

[0007] In order to achieve the above object, the technical solution of the present invention is:

[0008] A two-way non-return diaphragm pump with an expansion pressure relief structure includes a pump body, a drive assembly and a motor. The pump body includes an inlet and outlet water cover, an upper sealing gasket, a non-return seat, a lower sealing gasket, an inlet one-way valve, an outlet diaphragm, a valve body fixing seat, an upper fixing frame and a lower fixing frame. The drive assembly has a water storage cavity, which is arranged in the upper fixing frame and the lower fixing frame. The motor is arranged on one side of the lower fixing frame and is connected to the drive assembly. The valve body fixing seat is provided with an inlet cavity and a drain cavity connected to the water storage cavity. The inlet one-way valve and the outlet diaphragm are respectively provided with In the water inlet chamber and the drainage chamber, water inlet channels and drainage channels connected to the water inlet chamber and the drainage chamber are formed on the water inlet and outlet covers, the upper sealing gasket, the anti-return seat and the lower sealing gasket. A return liquid hole opposite to the drainage channel and the water inlet chamber on the water inlet and outlet covers is provided on the anti-return seat. A return liquid pipe extending into the water inlet chamber is formed on the circumference of the return liquid hole. A pressure relief sleeve is formed on the lower sealing gasket and is sleeved on the return liquid pipe. The water outlet end of the return liquid pipe is closed by the pressure relief sleeve. A pressure relief port is provided on the pressure relief sleeve, and the pressure relief port is staggered with the water outlet end of the return liquid pipe.

[0009] Preferably, the water outlet end of the liquid return pipe is located on the side wall thereof, and the pressure relief port is located at the bottom of the pressure relief sleeve.

[0010] Preferably, the water inlet and outlet cover is provided with a communication channel which is parallel to and passes through the water inlet channel, and the communication channel is opposite to the water storage cavity and the drainage cavity in upper and lower directions.

[0011] Preferably, a pagoda spring is provided between the communicating passage of the water inlet and outlet cover and the upper sealing gasket.

[0012] Preferably, the water inlet and outlet cover is formed with a positioning slot in its connecting channel, and a positioning boss opposite to the positioning slot is formed on the upper sealing gasket, one end of the pagoda spring is inserted into the positioning slot, and the other end is mounted on the positioning boss.

[0013] Preferably, the upper sealing gasket is formed with a sealing groove opposite to the drainage channel of the anti-return seat, and the anti-return seat is formed with a lower retaining ring circumferentially distributed on the drainage channel, and the upper sealing gasket is mounted on the lower retaining ring through its sealing groove.

[0014] Preferably, an upper retaining ring is formed in the water sealing groove, and the upper retaining ring extends into the lower retaining ring and is plugged into and matched with the lower retaining ring.

[0015] Preferably, the inner diameter of the water sealing groove increases from its closed end to the open end, the inner diameter of the lower retaining ring increases from one side away from the water sealing groove to the other side, the outer wall of the lower retaining ring abuts against the side wall of the water sealing groove, and the upper retaining ring abuts against the inner wall of the lower retaining ring.

[0016] Preferably, the drive assembly includes an eccentric wheel, a needle shaft, a swing frame and a compression bowl, the eccentric wheel is eccentrically connected to the output end of the motor, the needle shaft is tilted on the eccentric wheel, the swing frame is arranged on the needle shaft and connected to the air drum of the compression bowl, the water storage chamber is formed on the compression bowl and is equal in number to the air drum, and the compression bowl is mounted on the upper fixed frame.

[0017] A method for operating a bidirectional non-return diaphragm pump having the above-mentioned expansion and pressure relief structure comprises the following steps:

[0018] Water Inlet:

[0019] The operation of the motor causes the driving assembly to rotate eccentrically, and the driving assembly drives the air drums of the compression bowl to stretch in sequence. Under the action of the stretched air drums, the corresponding water storage chambers expand, thereby forming a negative pressure in the water storage chamber. Under the action of the negative pressure, the water inlet one-way valve moves to connect the water storage chamber with the water inlet chamber, and under the action of the negative pressure, water is drawn in from the inlet flow channel of the water inlet and outlet cover, and part of the water that flows into the water inlet flow channel of the water inlet and outlet cover flows into the connecting channel, and the remaining water passes through the upper sealing gasket, the check seat and the water inlet flow channel on the lower sealing gasket in sequence and enters the water inlet chamber, and enters the liquid storage chamber in the water inlet chamber. The connecting channel filled with water makes the pressure on both sides of the water outlet diaphragm in the drainage chamber equal;

[0020] Pumping water:

[0021] The continuous rotation of the motor output end causes the driving assembly to drive the air drums of the compression bowl to retract in sequence. Under the action of the retracting air drums, the corresponding water storage chambers shrink. The inner wall of the shrinking water storage chamber exerts pressure on the water therein. The water pressure generated by the water acts on one side of the water outlet diaphragm. As the water pressure increases, when its pressure value exceeds the pressure on the other side of the water outlet diaphragm, the water outlet diaphragm moves to compress the pagoda spring, and the water storage chamber and the drainage chamber are connected. The water enters the drainage chamber from the water storage chamber, and then flows through the lower sealing gasket, the upper sealing gasket and the drainage channel on the check seat in sequence, and is finally pumped to the outside through the drainage channel of the water inlet and outlet cover;

[0022] Pressure relief protection:

[0023] When the drainage channel of the water inlet and outlet cover is blocked and water cannot be discharged, the water pressure generated by the water retained in the drainage channel acts on the position where the lower sealing gasket pressure relief sleeve is relative to the water outlet end of the return liquid pipe. When the pressure value exceeds a certain value, the pressure relief sleeve expands outward, and a gap is generated between the pressure relief sleeve and the return liquid pipe. The water outlet end of the return liquid pipe is connected to the pressure relief port through the generated gap. The water entering the return liquid pipe passes through the water outlet end of the return liquid pipe and is discharged into the water inlet chamber from the pressure relief port, thereby reducing the water pressure acting on the pressure relief sleeve.

[0024] Compared with the prior art, the advantages of the present invention are:

[0025] The present invention can achieve pressure relief protection by directly improving the structure of the upper sealing gasket and the anti-return seat of the existing diaphragm pump, without adding additional accessories, so it will not cause an increase in production costs in the case of mass production. Moreover, during assembly, since the overall structure of the diaphragm pump has not been significantly changed compared with the traditional diaphragm pump, it can be assembled and formed through the original assembly process, effectively avoiding the increase in the complexity and difficulty of the assembly process. In addition, the characteristics of the rubber pressure relief sleeve itself are utilized to expand and relieve pressure when the water pressure increases. When the pressure drops to a level less than the elastic force of the pressure relief sleeve to restore the deformation, the elastic force is used to re-wrap the return liquid pipe, so that the communication between the return liquid hole, the return liquid pipe and the water inlet chamber can be automatically switched, so it also has the advantage of a clever design structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the diaphragm pump of the present invention;

[0027] Figure 2 This is a schematic diagram of the overall structure of the water inlet and outlet covers of the diaphragm pump of the present invention;

[0028] Figure 3 It is a schematic diagram of the overall structure of the sealing gasket on the diaphragm pump of the present invention;

[0029] Figure 4 This is a schematic diagram of the overall structure of the sealing gasket on the diaphragm pump of the present invention from another perspective;

[0030] Figure 5 This is a schematic diagram of the overall structure of the diaphragm pump anti-reverse seat of the present invention;

[0031] Figure 6 This is a schematic diagram of the overall structure of the diaphragm pump anti-return seat from another perspective of the present invention;

[0032] Figure 7 This is a schematic diagram of the overall structure of the lower sealing gasket of the diaphragm pump of the present invention;

[0033] Figure 8 This is a schematic diagram of the overall structure of the diaphragm pump valve body fixing seat of the present invention;

[0034] Figure 9 Schematic diagram of the exploded structure of the diaphragm pump drive assembly of the present invention;

[0035] Figure 10 This is a schematic diagram of the overall structure of the diaphragm pump after the water inlet and outlet covers are separated (the arrows indicate the direction of water flow during pressure relief protection);

[0036] Figure 11 This is a schematic diagram of the overall structure of the diaphragm pump of the present invention after the water inlet and outlet covers are separated from another perspective (the arrow indicates the direction of water flow during pressure relief protection);

[0037] Figure 12 This is a schematic diagram of the overall structure of the diaphragm pump after the water inlet and outlet covers, upper sealing gasket, anti-return seat and lower sealing gasket are separated (the arrow indicates the direction of water flow during pressure relief protection);

[0038] Figure 13 It is a schematic cross-sectional structural diagram of the diaphragm pump of the present invention.

[0039] As shown in the figure:

[0040] a1. Water inlet channel; a2. Water outlet channel; 1. Motor; 2. Water inlet and outlet covers; 201. Connecting channel; 201a. Positioning slot; 3. Upper sealing gasket; 301. Positioning boss; 302. Water sealing groove; 303. Upper retaining ring; 4. Check seat; 401. Liquid return hole; 402. Liquid return pipe; 403. Lower retaining ring; 5. Lower sealing gasket; 501. Pressure relief sleeve; 501a. Pressure relief port; 6. Water inlet check valve; 7. Water outlet diaphragm; 8. Valve body fixing seat; 801. Water inlet chamber; 802. Water outlet chamber; 9. Upper fixing frame; 10. Lower fixing frame; 11. Pagoda spring; 12. Eccentric wheel; 13. Needle shaft; 14. Swing frame; 15. Compression bowl; 1501. Water storage chamber; 1502. Air drum. DETAILED DESCRIPTION

[0041] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] 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 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, specific direction structures and operations, and therefore should not be understood as limiting the present invention.

[0043] It should be noted that the instruction manual Figure 13 The arrows in the diagram indicate the direction of liquid flow during liquid inlet.

[0044] like Figures 1 to 13As shown, the present invention first relates to a two-way non-return diaphragm pump with an expansion pressure relief structure, which includes a pump body, a drive assembly and a motor 1, wherein the pump body includes an inlet and outlet water cover 2, an upper sealing gasket 3, a non-return seat 4, a lower sealing gasket 5, a water inlet check valve 6, a water outlet diaphragm 7, a valve body fixing seat 8, an upper fixing frame 9 and a lower fixing frame 10 and the like which are consistent with the existing diaphragm pump structure, the inlet and outlet water cover 2, the non-return seat 4, the valve body fixing seat 8, the upper fixing frame 9 and the lower fixing frame 10 are connected in sequence from top to bottom, the upper sealing gasket 3 is arranged between the inlet and outlet water cover 2 and the non-return seat 4, the lower sealing gasket 5 is arranged between the non-return seat 4 and the valve body fixing seat 8, the upper sealing gasket 3 and the lower sealing gasket 5 are both made of rubber, the water inlet check valve 6 and the water outlet diaphragm 7 are both arranged on the valve body fixing seat 8, the drive assembly has a storage The water chamber 1501 is provided in the upper fixing frame 9 and the lower fixing frame 10, the motor 1 is provided on one side of the lower fixing frame 10, and its output end is connected to the driving assembly. The valve body fixing seat 8 is provided with a water inlet chamber 801 and a drainage chamber 802 connected to the water storage chamber 1501, and the drainage chamber 802 is located in the middle position of the valve body fixing seat 8. The water inlet chamber 801 is opened around the drainage chamber 802, and the water inlet check valve 6 is located in the communication position between the water inlet chamber 801 and the water storage chamber 1501. In the present invention, the water inlet check valve 6 uses an umbrella valve, and the water outlet diaphragm 7 is provided in the communication position between the drainage chamber 802 and the water storage chamber 1501. The water outlet diaphragm 7 is also a one-way valve. The water inlet and outlet cover 2, the upper sealing gasket 3, the check seat 4 and the lower sealing gasket 5 are formed with the water inlet chamber 801 and the drainage chamber 802. The connected water inlet channel a1 and the drainage channel a2 are different from the upper sealing gasket 3, the check seat 4 and the lower sealing gasket 5. The water inlet pipe and the drainage pipe are formed on the water inlet and outlet cover 2, and the water inlet channel a1 and the drainage channel a2 are formed by the inner pipe sections of the water inlet pipe and the drainage pipe. Different from the existing diaphragm pump, the check seat 4 is provided with a return liquid hole 401. The return liquid hole 401 is opposite to the water inlet cavity 801 and the drainage channel a2 on the water inlet and outlet cover 2. The drainage channel a2 can also be connected to the water inlet cavity 801 through the return liquid hole 401. A return liquid pipe 402 is formed on the check seat 4 circumferentially of the return liquid hole 401. The return liquid pipe 402 extends downward into the water inlet cavity 801. The return liquid pipe 402 of the tubular structure does not affect the return liquid hole 401 and the water inlet cavity 801 and the drainage channel a 2, a pressure relief sleeve 501 is formed on the lower sealing gasket 5. It can be understood that the pressure relief sleeve 501 is made of the same rubber material as the lower sealing gasket 5. The pressure relief sleeve 501 is mounted on the return liquid pipe 402 to seal the water outlet end of the return liquid pipe 402. The elasticity of the rubber material itself is tightly wrapped around the outside of the return liquid pipe 402 to form an interference fit, thereby cutting off the communication between the return liquid hole 401, the return liquid pipe 402 and the water inlet chamber 801. A pressure relief port 501a is provided on the pressure relief sleeve 501. The pressure relief port 501a is misaligned with the water outlet end of the return liquid pipe 402, that is, the extended position of the pressure relief port 501a and the water outlet end of the return liquid pipe 402 does not overlap. When the drainage channel a2 of the water inlet and outlet cover 2 is blocked and water cannot be discharged, the water that cannot be pumped out is retained in the drainage channel a2.402 and the pressure relief port 501a. It is clear that pressure relief protection can be achieved by directly improving the structure of the upper sealing gasket 3 and the anti-return seat 4 of the existing diaphragm pump, without adding additional accessories. Therefore, in the case of mass production, there will be no increase in production costs. Moreover, during assembly, since the overall structure of the diaphragm pump has not been significantly changed compared to traditional diaphragm pumps, it can be assembled and formed using the original assembly process, effectively avoiding the increase in the complexity and difficulty of the assembly process. In addition, the rubber material pressure relief sleeve 501 itself is used to expand and relieve pressure when the water pressure increases. When the pressure drops to a level less than the elastic force of the pressure relief sleeve 501 to restore its deformation, the elastic force is used to rewrap the return liquid pipe 402, so that the communication between the return liquid hole 401, the return liquid pipe 402 and the water inlet chamber 801 can be automatically switched. Therefore, it also has the advantage of an ingenious design structure.

[0045] Furthermore, the water outlet end of the return liquid pipe 402 is located on its side wall, and the pressure relief port 501a is located at the bottom of the pressure relief sleeve 501, that is, an L-shaped sealing position is formed between the water outlet end of the pressure relief sleeve 501 and the pressure relief port 501a, thereby increasing the sealing performance of the pressure relief sleeve 501 when it is sleeved on the return liquid pipe 402. When the pressure relief sleeve 501 expands and a gap is generated between it and the outer wall of the return liquid pipe 402, the liquid accumulated in the drainage channel a2 flows out from the water outlet end on the side of the return liquid pipe 402 and then flows downward until it is discharged into the water inlet chamber 801 at the pressure relief port 501a.

[0046] Furthermore, a connecting channel 201 is provided on the water inlet and outlet cover 2, which is parallel to and connected with the water inlet channel a1. The connecting channel 201 is opposite to the water storage chamber 1501 and the drainage chamber 802. When water is inlet, part of the water flowing into the water inlet channel a1 of the water inlet and outlet cover 2 first flows into the connecting channel 201, and the remaining water passes through the water inlet channel a1 on the upper sealing gasket 3, the check seat 4 and the lower sealing gasket 5 in turn and enters the water inlet chamber 801, and enters the liquid storage chamber of the drive component in the water inlet chamber 801. As a whole, the connecting channel 201, the water inlet channel a1 and the water storage chamber 1501 below are connected. 01 together form a U-shaped chamber, the two ends of the chamber are the connecting channel 201 and the water storage chamber 1501, the chamber can be regarded as the inner pipe of the communicating vessel, when water is inflowing or shut down, the pressure on both sides of the water outlet diaphragm 7 is equal, the water outlet diaphragm 7 cannot move under the action of the water pressure in the water storage chamber 1501, and the drainage chamber 802 is connected with the water storage chamber 1501 to achieve positive check, and then use the principle of the communicating vessel to avoid leakage of the diaphragm pump of the present invention when the amount of liquid accumulated in the water inlet channel a1 is large or small, so that it maintains excellent sealing performance.

[0047] like Figure 2 、 Figure 10 and Figure 13 As shown, a pagoda spring 11 is provided between the communicating channel 201 of the water inlet and outlet cover 2 and the upper sealing gasket 3. The two ends of the pagoda spring 11 are respectively in contact with the inner wall of the communicating channel 201 and the upper sealing gasket 3. The elastic force of the pagoda spring 11 acts directly on the upper sealing gasket 3, increasing the pressure of the upper sealing gasket 3 acting on the water outlet diaphragm 7, so that the pressure on the side of the water outlet diaphragm 7 close to the upper sealing gasket 3 is greater than the pressure on the other side, thereby better avoiding the free movement of the water outlet diaphragm 7 when the diaphragm pump of the present invention is in a non-working state, thereby further improving the overall sealing performance.

[0048] like Figure 2 、 Figure 3 、 Figure 10 and Figure 13 As shown, the water inlet and outlet cover 2 is formed with a positioning slot 201a in its connecting channel 201, and the upper sealing gasket 3 is formed with a positioning boss 301 opposite to the positioning slot 201a. One end of the pagoda spring 11 is inserted into the positioning slot 201a, and the other end is mounted on the positioning boss 301. Based on the above arrangement, the deformation direction of the pagoda spring 11 can be limited to ensure that the pagoda spring 11 always deforms in a straight line, thereby avoiding distortion of the pagoda spring 11 and improving its service life.

[0049] like Figure 4 、 Figure 5 、 Figure 12 and Figure 13As shown, a water sealing groove 302 is formed on the upper sealing gasket 3, which is opposite to the drainage channel a2 of the anti-backflow seat 4, and a lower retaining ring 403 is formed on the anti-backflow seat 4 in the circumference of its drainage channel. The upper sealing gasket 3 is sleeved on the lower retaining ring 403 through its water sealing groove 302, and then interlaced with the outer wall of the lower retaining ring 403, and the drainage channel a2 of the anti-backflow seat 4 is closed by the closed end of the lower retaining ring 403. In this state, not only the overall sealing performance is improved, but also the outer wall of the lower retaining ring 403 supports the water sealing groove 302. When subjected to liquid pressure for a long time and frequently, the possibility of deformation of the water sealing groove 302 made of the flexible material is reduced, thereby forming good protection for the upper sealing gasket 3 and extending the service life of the upper sealing gasket 3.

[0050] like Figure 5 、 Figure 12 and Figure 13 As shown, an upper retaining ring 303 is formed in the water sealing groove 302, and the upper retaining ring 303 extends into the lower retaining ring 403 and is plugged into it. From the overall point of view, the fitting position between the water sealing groove 302, the lower retaining ring 403 and the upper retaining ring 303 is a labyrinth groove structure, which further improves the sealing performance of the upper sealing gasket 3. At the same time, even if the upper retaining ring 303 of the upper sealing gasket 3 located in the lower retaining ring 403 is partially deformed and a gap appears between it and the lower retaining ring 403, the liquid can be blocked by the lower retaining ring 403 made of hard material after passing through this gap, thereby avoiding the liquid pressure directly acting on the inner wall of the outer water sealing groove 302 to cause deformation of the water sealing groove 302, thereby providing double protection for the upper sealing gasket 3.

[0051] like Figure 4 、 Figure 5 、 Figure 12 and Figure 13 As shown, the inner diameter of the water sealing groove 302 increases from its closed end to the open end, and the inner diameter of the lower retaining ring 403 increases from one side away from the water sealing groove 302 to the other side. The outer wall of the lower retaining ring 403 abuts against the side wall of the water sealing groove 302, and the upper retaining ring 303 abuts against the inner wall of the lower retaining ring 403. It can be understood that based on the above arrangement, the contact surfaces between the lower retaining ring 403 and the water sealing groove 302, and between the upper retaining ring 303 and the lower retaining ring 403 are linear, leaving a deformable space for the upper retaining ring 303 and the inner wall of the water sealing groove 302 to form a fit when the water pressure acts on them.

[0052] like Figure 9 and Figure 13As shown, the driving assembly includes an eccentric wheel 12, a needle shaft 13, a swing frame 14 and a compression bowl 15. The eccentric wheel 12, the needle shaft 13 and the swing frame 14 are all located in the upper fixed frame 9 and the lower fixed frame 10, wherein the eccentric wheel 12 is eccentrically connected to the output end of the motor 1, the needle shaft 13 is tilted on the eccentric wheel 12, the swing frame 14 is arranged on the needle shaft 13 and is connected to the air drum 1502 of the compression bowl 15, and the water storage chamber 1501 is formed on the compression bowl 15 and is equal to the air drum 1502. The compression bowl 15 is mounted on the upper fixed frame 9. When the motor 1 is running, its output end drives the eccentric wheel 12 to rotate eccentrically, the eccentric wheel 12 drives the tilted needle shaft 13 to rotate, the needle shaft 13 drives the swing frame 14 to rotate, and the swing frame 14 keeps floating up and down while rotating, thereby driving the air drum 1502 of the compression bowl 15 to change between stretching and contracting, and the volume of the water storage chamber 1501 expands and contracts accordingly, thereby realizing water suction and pumping.

[0053] Combine Figures 1 to 13 The present invention also relates to an operating method of a bidirectional non-return diaphragm pump having an expansion pressure relief structure, which comprises the following steps:

[0054] Water Inlet:

[0055] The operation of the motor 1 causes the driving assembly to rotate eccentrically, and the driving assembly drives the air drums 1502 of the compression bowl 15 to stretch in sequence. Under the action of the stretched air drums 1502, the corresponding water storage chamber 1501 is expanded, thereby forming a negative pressure in the water storage chamber 1501. Under the action of the negative pressure, the water inlet check valve 6 moves to connect the water storage chamber 1501 with the water inlet chamber 801, and under the action of the negative pressure, water is drawn in from the inlet flow channel of the water inlet and outlet cover 2, and part of the water flowing into the water inlet flow channel a1 of the water inlet and outlet cover 2 flows into the connecting channel 201, and the remaining water enters the water inlet chamber 801 through the water inlet flow channel a1 on the upper sealing gasket 3, the check seat 4 and the lower sealing gasket 5 in sequence, and enters the liquid storage chamber in the water inlet chamber 801. The connecting channel 201 filled with water makes the pressure on both sides of the water outlet diaphragm 7 in the drainage chamber 802 equal;

[0056] Pumping water:

[0057] The continuous rotation of the output end of the motor 1 causes the driving assembly to drive the air drums 1502 of the compression bowl 15 to retract in sequence. Under the action of the retracting air drums 1502, the corresponding water storage chamber 1501 is contracted. The contracted inner wall of the water storage chamber 1501 exerts pressure on the water therein. The water pressure generated by the water acts on one side of the water outlet diaphragm 7. As the water pressure increases, when its pressure value exceeds the pressure on the other side of the water outlet diaphragm 7, the water outlet diaphragm 7 moves to compress the pagoda spring 11, and the water storage chamber 1501 is connected to the drainage chamber 802. The water enters the drainage chamber 802 from the water storage chamber 1501, and then flows through the drainage channel a2 on the lower sealing gasket 5, the upper sealing gasket 3 and the check seat 4 in sequence, and is finally pumped to the outside through the drainage channel a2 of the water inlet and outlet cover 2;

[0058] Pressure relief protection:

[0059] When the drainage channel a2 of the water inlet and outlet cover 2 is blocked and water cannot be discharged, the water pressure generated by the water retained in the drainage channel a2 acts on the position of the pressure relief sleeve 501 of the lower sealing gasket 5 relative to the water outlet end of the return liquid pipe 402. When the pressure value exceeds a certain value, the pressure relief sleeve 501 expands outward, and a gap is generated between the pressure relief sleeve 501 and the return liquid pipe 402. The gap enables the water outlet end of the return liquid pipe 402 to be connected with the pressure relief port 501a. The water entering the return liquid pipe 402 passes through the water outlet end of the return liquid pipe 402 and is discharged from the pressure relief port 501a into the water inlet chamber 801, thereby reducing the water pressure acting on the pressure relief sleeve 501.

[0060] The above embodiments and descriptions are only for explaining the principles and best embodiments of the present invention. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and improvements, which shall fall within the scope of the invention to be protected.

Claims

1. A bidirectional non-return diaphragm pump with an expansion pressure relief structure, comprising a pump body, a drive assembly and a motor (1), wherein the pump body comprises a water inlet and outlet cover (2), an upper sealing gasket (3), a non-return seat (4), a lower sealing gasket (5), a water inlet check valve (6), a water outlet diaphragm (7), a valve body fixing seat (8), an upper fixing frame (9) and a lower fixing frame (10), wherein the drive assembly has a water storage chamber which is arranged in the upper fixing frame (9) and the lower fixing frame (10), and wherein the motor (1) is arranged in the lower fixing frame (10). The side is connected to the driving component, the valve body fixing seat (8) is provided with a water inlet chamber (801) and a drainage chamber (802) communicating with the water storage chamber, the water inlet check valve (6) and the water outlet diaphragm (7) are respectively arranged in the water inlet chamber (801) and the drainage chamber (802), and the water inlet and outlet cover (2), the upper sealing gasket (3), the check seat (4) and the lower sealing gasket (5) are formed with a water inlet flow channel (a1) and a drainage flow channel (a2) communicating with the water inlet chamber (801) and the drainage chamber (802), characterized in that: The anti-return seat (4) is provided with a liquid return hole (401) which is opposite to the drainage channel (a2) on the water inlet and outlet cover (2) and the water inlet chamber (801); a liquid return pipe (402) extending into the water inlet chamber (801) is formed on the circumference of the liquid return hole (401); a pressure relief sleeve (501) which is sleeved on the liquid return pipe (402) is formed on the lower sealing gasket (5); the water outlet end of the liquid return pipe (402) is sealed by the pressure relief sleeve (501); and the pressure relief sleeve (501) is provided on the lower sealing gasket (5). 01), the pressure relief port (501a) is staggered with the water outlet end of the return liquid pipe (402), the water outlet end of the return liquid pipe (402) is located on its side wall, the pressure relief port (501a) is located at the bottom of the pressure relief sleeve (501), the water inlet and outlet cover (2) is provided with a communication channel (201) parallel to and through the water inlet flow channel (a1), the communication channel (201) is opposite to the water storage chamber and the drainage chamber (802) in upper and lower positions.

2. A bidirectional non-return diaphragm pump with an expansion and pressure relief structure according to claim 1, characterized in that: A pagoda spring (11) is provided between the communication channel (201) of the water inlet and outlet cover (2) and the upper sealing gasket (3).

3. A bidirectional non-return diaphragm pump with an expansion and pressure relief structure according to claim 2, characterized in that: The water inlet and outlet cover (2) is formed with a positioning slot (201a) in its communication channel (201), and the upper sealing gasket (3) is formed with a positioning protrusion (301) opposite to the positioning slot (201a), and one end of the pagoda spring (11) is inserted into the positioning slot (201a), and the other end is sleeved on the positioning protrusion (301).

4. A bidirectional non-return diaphragm pump with an expansion and pressure relief structure according to claim 1, characterized in that: The upper sealing gasket (3) is formed with a sealing groove (302) opposite to the drainage channel (a2) of the anti-return seat (4), and the anti-return seat (4) is formed with a lower retaining ring (403) arranged in a circumferential direction of the drainage channel (a2) thereof. The upper sealing gasket (3) is sleeved on the lower retaining ring (403) through its sealing groove (302).

5. A bidirectional non-return diaphragm pump with an expansion and pressure relief structure according to claim 4, characterized in that: An upper retaining ring (303) is formed in the water sealing groove (302), and the upper retaining ring (303) extends into the lower retaining ring (403) and is plugged into and engaged with the lower retaining ring (403).

6. A bidirectional non-return diaphragm pump with an expansion and pressure relief structure according to claim 5, characterized in that: The inner diameter of the water sealing groove (302) increases from its closed end to its open end, and the inner diameter of the lower retaining ring (403) increases from one side away from the water sealing groove (302) to the other side. The outer wall of the lower retaining ring (403) abuts against the side wall of the water sealing groove (302), and the upper retaining ring (303) abuts against the inner wall of the lower retaining ring (403).

7. A bidirectional non-return diaphragm pump with an expansion and pressure relief structure according to claim 1, characterized in that: The driving assembly comprises an eccentric wheel (12), a needle shaft (13), a swing frame (14) and a compression bowl (15); the eccentric wheel (12) is eccentrically connected to the output end of the motor (1); the needle shaft (13) is tiltedly arranged on the eccentric wheel (12); the swing frame (14) is arranged on the needle shaft (13) and connected to the air drum (1501) of the compression bowl (15); the water storage chamber is formed on the compression bowl (15) and is equal in number to the air drum (1501); and the compression bowl (15) is mounted on the upper fixed frame (9).

8. An operating method of a bidirectional non-return diaphragm pump with an expansion and pressure relief structure according to any one of claims 1 to 7, characterized in that: It includes the following steps: Water Inlet: The motor (1) is operated to cause the driving assembly to rotate eccentrically, and the driving assembly drives the air drums (1501) of the compression bowl (15) to stretch in sequence. Under the action of the stretched air drums (1501), the corresponding water storage chambers are expanded, thereby forming a negative pressure in the water storage chamber. Under the action of the negative pressure, the water inlet check valve (6) moves to connect the water storage chamber with the water inlet chamber (801), and under the action of the negative pressure, water is drawn in from the inlet flow channel of the water inlet and outlet cover (2). Part of the water that flows into the water inlet flow channel (a1) of the water inlet and outlet cover (2) flows into the connecting channel (201), and the remaining part of the water enters the water inlet chamber (801) through the upper sealing gasket (3), the check seat (4) and the water inlet flow channel (a1) on the lower sealing gasket (5) in sequence, and enters the liquid storage chamber in the water inlet chamber (801). The connecting channel (201) filled with water makes the pressure on both sides of the water outlet diaphragm (7) in the drainage chamber (802) equal; Pumping water: The continuous rotation of the output end of the motor (1) causes the driving assembly to drive the air drums (1501) of the compression bowl (15) to retract in sequence. Under the action of the retracting air drums (1501), the corresponding water storage chamber is contracted. The contracted inner wall of the water storage chamber exerts pressure on the water therein. The water pressure generated by the water acts on one side of the water outlet diaphragm (7). As the water pressure increases, when its pressure value exceeds the pressure on the other side of the water outlet diaphragm (7), the water outlet diaphragm (7) moves to compress the pagoda spring (11), and the water storage chamber and the drainage chamber (802) are connected. Water enters the drainage chamber (802) from the water storage chamber, and then flows through the drainage channel (a2) on the lower sealing gasket (5), the upper sealing gasket (3) and the check seat (4) in sequence, and is finally pumped to the outside through the drainage channel (a2) of the water inlet and outlet cover (2); Pressure relief protection: When the drainage channel (a2) of the water inlet and outlet cover (2) is blocked and water cannot be discharged, the water pressure generated by the water retained in the drainage channel (a2) acts on the position of the pressure relief sleeve (501) of the lower sealing gasket (5) relative to the water outlet end of the return liquid pipe (402). When the pressure value exceeds a certain value, the pressure relief sleeve (501) expands outward, and a gap is generated between the pressure relief sleeve (501) and the return liquid pipe (402). The water outlet end of the return liquid pipe (402) is connected to the pressure relief port (501a) through the generated gap. The water entering the return liquid pipe (402) passes through the water outlet end of the return liquid pipe (402) and is discharged from the pressure relief port (501a) into the water inlet chamber (801), thereby reducing the water pressure acting on the pressure relief sleeve (501).

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