Ball valve structure and diaphragm pump comprising same

Abstract

The utility model provides a ball valve structure and the diaphragm pump containing it, the ball valve structure sets up in the import or export pipeline of diaphragm pump, the ball valve structure includes: the guide valve bush, the valve cavity of accommodating valve ball is provided in the guide valve bush, the top and bottom of guide valve bush are provided with the orifice of axis coincidence and for medium flow, the orifice is linked together with valve cavity, the guide column is provided in the valve cavity, the guide column extends from the inner wall of valve cavity along the axis direction deviating the orifice, when the ball valve structure opens, the valve ball and the guide column abut and move in the valve cavity along the axis direction deviating the orifice. By setting up the guide column in the valve cavity, the guide column that extends along the axis direction deviating the orifice can change the movement track of valve ball in the valve cavity, has promoted the service life and maintenance cycle of valve ball. And, the noise of ball valve structure is reduced obviously in the use process.

Description

Technical Field

[0001] This utility model relates to the field of diaphragm pump technology, and in particular to a ball valve structure and a diaphragm pump containing the same. Background Technology

[0002] A diaphragm pump draws in and discharges process fluids by reciprocating the diaphragm and engaging the inlet and outlet ball valves. When the diaphragm or plunger moves backward, the volume within the pump head chamber increases, creating a partial vacuum and the suction stroke. At this point, the inlet ball valve is "sucked open" by this vacuum, allowing liquid to flow in from the inlet line and fill the increased space. The outlet ball valve remains tightly closed due to external system pressure and its own weight. When the diaphragm or plunger moves forward, compressing the liquid within the pump head chamber, the internal pressure continuously rises until it exceeds the pressure in the outlet line. This high pressure then forces the outlet ball valve open, forcing the liquid out of the system. The inlet ball valve is now closed, ensuring that all the pumped liquid flows to the outlet. The continuous switching between the closed and open states of the inlet and outlet ball valves is essential for the successful intake and discharge of process fluids.

[0003] In existing technologies, the internal structure of the guide valve sleeve dictates that the valve ball can only move in a straight up-and-down trajectory. This results in potentially destructive impacts from the high-speed, high-frequency impacts of the ball against the guide valve sleeve and valve seat. Even valve seats made of hard metal or engineering plastics will undergo plastic deformation under long-term, high-frequency impacts, leading to damage to the sealing line. The valve ball itself will also experience wear, deformation, and a reduction in surface finish. To maintain stable pump operation and accurate flow, the valve ball and valve seat need to be replaced periodically, increasing maintenance costs and downtime. Furthermore, the impact of the valve ball is an instantaneous momentum change, producing a sharp impact sound. In high-speed diaphragm pumps, this impact sound has a very high frequency, accumulating into a continuous noise. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects of the prior art where the movement trajectory of the valve ball in the valve cavity is straight up and down, which makes the valve ball and valve seat easy to be damaged and generate noise. The present invention provides a ball valve structure and a diaphragm pump containing the ball valve.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] A ball valve structure is provided in the inlet or outlet pipeline of a diaphragm pump, the ball valve structure comprising:

[0007] A guide valve sleeve is provided, which has a valve cavity for accommodating a valve ball. The top and bottom of the guide valve sleeve are provided with orifices that coincide on the axis and are used for medium flow. The orifices are connected to the valve cavity. A guide post is provided in the valve cavity. The guide post extends from the inner wall of the valve cavity along an axis that deviates from the orifice. When the ball valve structure is opened, the valve ball abuts against the guide post and moves in the valve cavity along an axis that deviates from the orifice.

[0008] In this design, a guide post is installed within the valve cavity. This guide post, extending off-axis from the orifice, alters the trajectory of the valve ball within the cavity. Compared to traditional guide valve sleeves where the top and bottom orifices are directly connected and the valve ball moves vertically along the orifice's axis, the guide post's alteration of the ball's trajectory reduces the height the ball travels away from the orifice when opening the orifice—to only one-third or one-half of its vertical movement. This reduces the ball's speed by 40% when it contacts the guide post, consequently reducing the force of the ball impacting the guide post. This prevents damage to the ball during prolonged use, extending its lifespan and reducing maintenance intervals. Furthermore, the reduced force of the ball impacting the guide post significantly lowers the noise level of the ball valve during operation, improving the user experience.

[0009] Preferably, at least two limiting posts are provided on the inner wall of the valve cavity, and the at least two limiting posts are arranged opposite to the guide post and form a rolling track within the valve cavity, and the valve ball is disposed within the rolling track.

[0010] In this solution, the above-mentioned settings form a rolling track within the valve cavity, limiting the range of movement of the valve ball and preventing the valve ball from contacting the inner wall of the valve cavity and generating significant noise.

[0011] Preferably, three limiting posts are provided, and the projections of the three limiting posts and the guide posts are arranged perpendicular to each other along the circumferential direction of the projection of the orifice.

[0012] In this solution, the above-mentioned settings further limit the range of motion of the valve ball, while improving the stability of the valve ball's movement in the circumferential direction of the orifice projection.

[0013] Preferably, the guide post protrudes from the inner wall of the valve cavity, and the guide post includes a first guide section and a second guide section. The first guide section is located close to the orifice, and the protrusion of the first guide section from the inner wall of the valve cavity is smaller than the protrusion of the second guide section from the inner wall of the valve cavity. The joint between the first guide section and the second guide section is smoothly transitioned.

[0014] In this solution, the above-mentioned settings are used to reduce the impact force of the valve ball on the guide post, thereby reducing valve ball wear. At the same time, the valve ball has two rolling stages after contacting the guide post, which can play a self-cleaning role against foreign matter adhering to the surface of the valve ball, improve the sealing performance of the valve ball, and help stabilize the output flow and pressure in the long term.

[0015] Preferably, the limiting post protrudes from the inner wall of the valve cavity, and the limiting post includes a first limiting segment and a second limiting segment. The first limiting segment is located close to the orifice and corresponds to the guide post. The size of the first limiting segment protruding from the inner wall of the valve cavity is larger than the size of the second limiting segment protruding from the inner wall of the valve cavity.

[0016] In this solution, the above settings enable the limiting post of the corresponding guide post to cooperate with the guide post, causing the valve ball to move in a way that deviates from a straight up-down motion.

[0017] Preferably, the ball valve structure further includes a valve seat for connection with the guide valve sleeve. The valve seat has an inlet for medium flow, the inlet corresponding to the orifice of the guide valve sleeve and the diameter of the inlet being smaller than the diameter of the valve ball. The valve seat has a groove at the end corresponding to the guide valve sleeve, and the guide valve sleeve has a protrusion at the end corresponding to the valve seat, the protrusion engaging with the groove.

[0018] In this solution, the above-mentioned settings are used to limit the valve ball by the valve seat, so that when the valve seat is connected to the guide valve sleeve, the orifice of the guide valve sleeve near the valve seat is limited by the valve seat, and the valve ball can always be located in the rolling track of the valve cavity.

[0019] Preferably, a limiting block is also provided at the orifice of the end of the guide valve sleeve opposite to the valve seat. The limiting block separates the orifice of the end of the guide valve sleeve opposite to the valve seat to form a first opening and a second opening with a size smaller than that of the valve ball.

[0020] In this scheme, the above-mentioned settings are used to limit the orifice of the guide sleeve away from the valve seat by using a limiting block, so that the valve ball can always be located in the rolling track of the valve cavity.

[0021] Preferably, a sealing part is also provided at the connection between the valve seat and the guide valve sleeve.

[0022] In this solution, the above-mentioned settings are used to improve the sealing performance at the connection between the valve seat and the guide valve sleeve.

[0023] Preferably, the valve seat is provided with a sealing groove at the end corresponding to the guide valve sleeve, and the sealing part is embedded in the sealing groove.

[0024] In this solution, the above-mentioned settings are used to install a sealing part to prevent the sealing part from shifting and causing the sealing performance at the connection between the valve seat and the guide valve sleeve to deteriorate.

[0025] A diaphragm pump comprising the ball valve structure described above.

[0026] In this solution, the diaphragm pump includes the aforementioned ball valve structure, which extends the maintenance cycle of the ball valve structure, reduces the usage cost of the ball valve structure, and utilizes the rolling track of the ball valve structure to enable the valve ball to self-clean, making it suitable for pumping fluids with complex materials and expanding the applicability of the diaphragm pump.

[0027] The significant advantages of this invention are as follows: By incorporating a guide post within the valve cavity, extending off-axis from the orifice, the guide post alters the trajectory of the valve ball. Compared to traditional guide valve sleeves where the top and bottom orifices are directly connected and the valve ball moves vertically along the orifice's axis, the guide post reduces the height of the valve ball's movement away from the orifice when opening—to only one-third or one-half of its vertical movement. This reduces the ball's speed by 40% upon contact with the guide post, consequently decreasing the force of the ball impacting the guide post. This prevents damage to the valve ball during prolonged use, extending its lifespan and reducing maintenance intervals. Furthermore, the reduced force of the ball impacting the guide post also significantly reduces noise during valve operation, improving the user experience. Attached Figure Description

[0028] Figure 1 This is a perspective view of the ball valve structure according to a preferred embodiment of the present invention.

[0029] Figure 2 This is an exploded view of the ball valve structure according to a preferred embodiment of the present invention.

[0030] Figure 3 This is a perspective view of a guide valve sleeve according to a preferred embodiment of the present invention.

[0031] Figure 4 This is a schematic diagram of the structure of the guide valve sleeve according to a preferred embodiment of the present invention.

[0032] Figure 5 This is a schematic diagram of the first movement of the valve cavity within the rolling track in a preferred embodiment of the present invention.

[0033] Figure 6 This is a schematic diagram of the second movement of the valve cavity within the rolling track in a preferred embodiment of the present invention.

[0034] Figure 7 This is a schematic diagram of the third movement of the valve cavity within the rolling track in a preferred embodiment of the present invention.

[0035] Figure 8 This is a schematic diagram of the fourth movement of the valve cavity within the rolling track, according to a preferred embodiment of the present invention.

[0036] Explanation of reference numerals in the attached figures:

[0037] Guide valve sleeve 1

[0038] Valve chamber 11

[0039] Guide column 111

[0040] First guide section 1111

[0041] Second guide section 1112

[0042] Limiting post 112

[0043] First limiting segment 1121

[0044] Second limiting segment 1122

[0045] Orifice 12

[0046] First opening 121

[0047] Second opening 122

[0048] Rolling track 13

[0049] 14 protrusions

[0050] Limit block 15

[0051] Valve ball 2

[0052] Valve seat 3

[0053] 31

[0054] Groove 32

[0055] Sealing groove 33

[0056] Sealing part 4 Detailed Implementation

[0057] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0058] This embodiment provides a ball valve structure, the specific structure of which is as follows: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the ball valve structure is installed in the inlet or outlet pipeline of the diaphragm pump, and the ball valve structure includes:

[0059] The guide valve sleeve 1 has a valve cavity 11 that accommodates the valve ball 2. The top and bottom of the guide valve sleeve 1 are provided with orifices 12 that coincide on the axis and are used for medium flow. The orifices 12 are connected to the valve cavity 11. The valve cavity 11 is provided with a guide post 111. The guide post 111 extends from the inner wall of the valve cavity 11 along the axis that deviates from the orifice 12. When the ball valve structure is opened, the valve ball 2 abuts against the guide post 111 and moves in the valve cavity 11 along the axis that deviates from the orifice 12.

[0060] Specifically, the guide valve sleeve 1 has a cylindrical structure. The top and bottom of the guide valve sleeve 1 are provided with orifices 12. The orifices 12 are connected to the valve cavity 11 inside the guide valve sleeve 1. A valve ball 2 is rolled in the valve cavity 11. When the valve ball 2 abuts against the orifice 12, the ball valve structure is closed. When the valve ball 2 is located in the valve cavity 11 and away from the orifice 12, the ball valve structure is open. Compared to the traditional valve cavity 11 extending straight up and down along the axis of the top and bottom orifices 12, in this embodiment, the valve cavity 11 is provided with a guide post 111 that deviates from the axis of the orifice 12, that is, deviates from the direction of medium flow of the orifice 12. The angle between the guide post 111 and the axis of the orifice 12 is an acute angle, and the opening of the angle faces the valve seat 3 of the ball valve structure. From the cross-section of the guide valve sleeve 1, the internal space of the valve cavity 11 is an irregular shape that is not rectangular. The solid structure on the side with the guide post 111 is larger, while the cavity on the side corresponding to the guide post 111 is larger. This allows the movement trajectory of the valve ball 2 in the valve cavity 11 to be changed by the guide post 111. That is, in this embodiment, the movement trajectory of the valve ball 2 is from the orifice 12 near the valve seat 3, that is, the bottom orifice 12, first along... After the orifice 12 rises a certain distance along its axis, it abuts against the guide post 111. Then, the valve ball 2 deviates from the axis of the orifice 12 and moves towards the inner wall of the valve cavity 11. Compared to the traditional guide valve sleeve 1 where the top and bottom orifices 12 are directly connected and the valve ball 2 moves directly up and down along the axis of the orifice 12, the guide post 111 alters the trajectory of the valve ball 2. This reduces the height of the valve ball 2 moving away from the orifice 12 when opening the orifice 12, to only one-third or one-half of the height moving directly up and down. This reduces the speed of the valve ball 2 when it contacts the guide post 111 by 40%, correspondingly reducing the force of the valve ball 2 impacting the guide post 111. This avoids damage to the valve ball 2 due to its long vertical movement distance, large impact force, and prolonged use, thus improving its service life and maintenance cycle. Furthermore, the reduced force of the valve ball 2 impacting the guide post 111 also significantly reduces the noise of the ball valve structure during use, improving the user experience.

[0061] In this embodiment, at least two limiting posts 112 are also provided on the inner wall of the valve cavity 11. The at least two limiting posts 112 are arranged opposite to the guide posts 111 and form a rolling track 13 in the valve cavity 11. The valve ball 2 is disposed in the rolling track 13.

[0062] Specifically, the two limiting posts 112 and the guide post 111 enclose and form a rolling track 13. The valve ball 2 is sandwiched between the two limiting posts 112 and the guide post 111. Both the limiting posts 112 and the guide post 111 protrude from the inner wall of the valve cavity 11. Therefore, compared with the situation where only one guide post 111 is provided, the valve ball 2 is guided by the guide post 111 to deviate from the orifice 12 and abut against the inner wall of the valve cavity 11 to change its straight up and down movement trajectory. By adding the limiting posts 112, the valve ball 2 no longer directly abuts against the inner wall of the valve cavity 11, which limits the movement range of the valve ball 2. The contact area between the valve ball 2 and the inner wall of the valve cavity 11 is reduced, so as to avoid the valve ball 2 abutting against the inner wall of the valve cavity 11 and generating more noise.

[0063] Preferably, three limiting posts 112 are provided, and the projections of the three limiting posts 112 and the guide posts 111 are arranged perpendicular to each other along the projection circumference of the orifice 12.

[0064] Specifically, the number of limiting posts 112 is further increased. At the same time, the projections of the four posts, namely the three limiting posts 112 and the guide post 111, correspond to the projections of the orifice 12 in the circumferential direction. The central angles of the projections of the four posts in the circumferential direction are 90°, that is, they are perpendicular to each other. The four posts are located at the four corners of the valve cavity 11 to further limit the movement range of the valve ball 2. At the same time, the number of limiting posts 112 is increased to improve the stability of the movement of the valve ball 2.

[0065] In this embodiment, the guide post 111 protrudes from the inner wall of the valve cavity 11. The guide post 111 includes a first guide section 1111 and a second guide section 1112. The first guide section 1111 is located near the orifice 12 and the size of the first guide section 1111 protruding from the inner wall of the valve cavity 11 is smaller than the size of the second guide section 1112 protruding from the inner wall of the valve cavity 11. The joint between the first guide section 1111 and the second guide section 1112 is smoothly transitioned.

[0066] Specifically, in cross-section, the guide post 111 protrudes from the inner wall of the valve cavity 11. The guide post 111 includes a first guide section 1111 and a second guide section 1112. The surface of the first guide section 1111 corresponding to the rolling track 13 is inclined to the axis of the orifice 12. Similarly, the surface of the second guide section 1112 corresponding to the rolling track 13 is also inclined to the axis of the orifice 12. The protrusion of the second guide section 1112 from the inner wall of the valve cavity 11 is larger than the protrusion of the first guide section 1111 from the inner wall of the valve cavity 11. When the valve ball 2 moves, it first contacts the first guide section 1111. Because the protrusion of the first guide section 1111 from the inner wall of the valve cavity 11 is small, the valve ball 2 generally moves away from the orifice 12 along the axis of the orifice 12. Furthermore, when the valve ball 2 moves to a certain height, it contacts the second guide section 1112. Because the protrusion of the second guide section 1112 from the inner wall of the valve cavity 11 is large... This causes the valve ball 2 to deviate from the axis of the orifice 12 and contact the corresponding limiting post 112 towards the inner wall of the valve cavity 11. That is, the valve ball 2 includes two rolling stages: an upward stage that disengages from the orifice 12 and a deviation stage that deviates from the axis of the orifice 12. Compared with the valve ball 2 impacting the inner wall limiting step of the guide valve sleeve 1 in a straight up and down motion, the height of the upward stage of the valve ball 2 is smaller, so as to reduce the impact force of the valve ball 2 on the guide post 111, thereby reducing the wear of the valve ball 2. The smooth transition joint can further reduce the wear of the valve ball 2.

[0067] Meanwhile, after the valve ball 2 contacts the guide post 111, it undergoes two rolling stages, resulting in a larger rotation. During the rotation, it contacts the surface of the guide post 111 or the limiting post 112, which can scrape off foreign matter adhering to the surface of the valve ball 2, thus playing a self-cleaning role. This improves the sealing performance of the valve ball 2 and is beneficial to the long-term stability of the output flow and pressure.

[0068] In this embodiment, the limiting post 112 protrudes from the inner wall of the valve cavity 11. The limiting post 112 includes a first limiting segment 1121 and a second limiting segment 1122. The first limiting segment 1121 is located near the orifice 12 and the size of the first limiting segment 1121 protruding from the inner wall of the valve cavity 11 is larger than the size of the second limiting segment 1122 protruding from the inner wall of the valve cavity 11.

[0069] Specifically, in cross-section, the limiting post 112 protrudes from the inner wall of the valve cavity 11. The limiting post 112 includes a first limiting segment 1121 and a second limiting segment 1122. The first limiting segment 1121 of the limiting post 112 corresponding to the guide post 111 corresponds to the first guide segment 1111, and the second limiting segment 1122 corresponds to the second guide segment 1112. The protrusion of the first limiting segment 1121 from the inner wall of the valve cavity 11 is larger than that of the second limiting segment 1122, so that it matches the smaller protrusion of the first guide segment 1111 from the inner wall of the valve cavity 11, forming a rolling track 13 that deviates from the axis of the orifice 12. This allows the limiting post 112 corresponding to the guide post 111 to cooperate with the guide post 111, causing the valve ball 2 to move in a way that deviates from a straight up-down motion.

[0070] In this embodiment, the ball valve structure also includes a valve seat 3, which is used to connect with the guide valve sleeve 1. The valve seat 3 is provided with a pipe port 31 for medium flow. The pipe port 31 corresponds to the orifice 12 of the guide valve sleeve 1 and the diameter of the pipe port 31 is smaller than the diameter of the valve ball 2. The valve seat 3 is provided with a groove 32 at the end corresponding to the guide valve sleeve 1, and the guide valve sleeve 1 is provided with a protrusion 14 at the end corresponding to the valve seat 3. The protrusion 14 cooperates with the groove 32.

[0071] Specifically, the valve seat 3 and the guide valve sleeve 1 are engaged via a groove 32 and a protrusion 14. The groove 32 is an annular groove located on the outer edge of the valve seat 3, and the protrusion 14 is a cylindrical protrusion located on the outer edge of the guide valve sleeve 1. After the valve seat 3 and the guide valve sleeve 1 are engaged, the orifice 12 of the guide valve sleeve 1 near the valve seat 3 is limited by the valve seat 3, preventing the valve ball 2 from leaking out of the orifice 12 of the guide valve sleeve 1 near the valve seat 3. The valve ball 2 can always remain within the rolling track 13 of the valve cavity 11. Of course, during maintenance, the valve seat 3 can be disassembled to replace the valve ball 2.

[0072] Furthermore, in this embodiment, a limiting block 15 is also provided at the orifice 12 at the end of the guide valve sleeve 1 away from the valve seat 3. The limiting block 15 separates the orifice 12 at the end of the guide valve sleeve 1 away from the valve seat 3 to form a first opening 121 and a second opening 122 with a size smaller than that of the valve ball 2.

[0073] Specifically, the limiting block 15 is disposed at the orifice 12. The two ends of the limiting block 15 can be connected to two limiting posts 112 disposed opposite to each other, or one limiting post 112 and one guide post 111, so as to divide the orifice 12 into a first opening 121 and a second opening 122 through which the valve ball 2 cannot pass. That is, the limiting block 15 restricts the orifice 12 of the guide valve sleeve 1 away from the valve seat 3, so that the valve ball 2 can always be located in the rolling track 13 of the valve cavity 11.

[0074] In this embodiment, a sealing part 4 is also provided at the connection between the valve seat 3 and the guide valve sleeve 1. The sealing part 4 can be provided at the mating point of the groove 32 and the protrusion 14 to improve the sealing performance at the connection between the valve seat 3 and the guide valve sleeve 1. The sealing part 4 can be a rubber part in the prior art or other structures used for sealing, which will not be described in detail here.

[0075] In this embodiment, a sealing groove 33 is provided at the end of the valve seat 3 corresponding to the guide valve sleeve 1, and the sealing part 4 is embedded in the sealing groove 33. Compared with the sealing part 4 being directly provided on the mating surface of the groove 32 and the protrusion 14, by providing the sealing groove 33 and embedding the sealing part 4 into the sealing groove 33, the mating surface of the groove 32 and the protrusion 14 is flat and free of foreign objects, making the mating more convenient. At the same time, it also prevents the sealing part 4 from shifting and causing the sealing performance at the connection between the valve seat 3 and the guide valve sleeve 1 to deteriorate.

[0076] This embodiment also provides a diaphragm pump, which includes the ball valve structure described above. By extending the maintenance cycle of the ball valve structure and reducing its usage cost, the rolling track 13 of the ball valve structure enables the valve ball 2 to self-clean, making it suitable for pumping fluids with complex materials and expanding the applicability of the diaphragm pump.

[0077] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A ball valve structure, wherein the ball valve structure is disposed in the inlet or outlet pipeline of a diaphragm pump, characterized in that, The ball valve structure includes: A guide valve sleeve is provided, which has a valve cavity for accommodating a valve ball. The top and bottom of the guide valve sleeve are provided with orifices that coincide on the axis and are used for medium flow. The orifices are connected to the valve cavity. A guide post is provided in the valve cavity. The guide post extends from the inner wall of the valve cavity along an axis that deviates from the orifice. When the ball valve structure is opened, the valve ball abuts against the guide post and moves in the valve cavity along an axis that deviates from the orifice.

2. The ball valve structure as described in claim 1, characterized in that, At least two limiting posts are also provided on the inner wall of the valve cavity. The at least two limiting posts are arranged opposite to the guide post and form a rolling track within the valve cavity. The valve ball is disposed within the rolling track.

3. The ball valve structure as described in claim 2, characterized in that, The limiting post is provided in three parts, and the projections of the three limiting posts and the guide post are arranged perpendicular to each other along the circumferential direction of the projection of the orifice.

4. The ball valve structure as described in claim 3, characterized in that, The guide post protrudes from the inner wall of the valve cavity. The guide post includes a first guide section and a second guide section. The first guide section is located close to the orifice, and the protrusion of the first guide section from the inner wall of the valve cavity is smaller than the protrusion of the second guide section from the inner wall of the valve cavity. The joint between the first guide section and the second guide section is smoothly transitioned.

5. The ball valve structure as described in claim 4, characterized in that, The limiting post protrudes from the inner wall of the valve cavity. The limiting post includes a first limiting section and a second limiting section. The first limiting section is located close to the orifice and corresponds to the guide post. The size of the first limiting section protruding from the inner wall of the valve cavity is larger than the size of the second limiting section protruding from the inner wall of the valve cavity.

6. The ball valve structure as described in claim 1, characterized in that, The ball valve structure also includes a valve seat for connecting with the guide valve sleeve. The valve seat has a port for medium flow inside, the port corresponds to the orifice of the guide valve sleeve and the diameter of the port is smaller than the diameter of the valve ball. The valve seat has a groove at the end corresponding to the guide valve sleeve and a protrusion at the end corresponding to the valve seat, the protrusion engaging with the groove.

7. The ball valve structure as described in claim 6, characterized in that, A limiting block is also provided at the orifice of the end of the guide valve sleeve opposite to the valve seat. The limiting block separates the orifice of the end of the guide valve sleeve opposite to the valve seat to form a first opening and a second opening with a size smaller than that of the valve ball.

8. The ball valve structure as described in claim 6, characterized in that, A sealing part is also provided at the connection between the valve seat and the guide valve sleeve.

9. The ball valve structure as described in claim 8, characterized in that, The valve seat is provided with a sealing groove at the end corresponding to the guide valve sleeve, and the sealing part is embedded in the sealing groove.

10. A diaphragm pump, characterized in that, The diaphragm pump includes a ball valve structure as described in any one of claims 1-9.

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