Pump head structure of diaphragm pump

Abstract

The utility model relates to a pump head structure of a diaphragm pump, and belongs to the technical field of diaphragm booster pumps. The pump head structure of the diaphragm pump comprises a fluid chamber, a diaphragm chamber, a sealing ring, a diaphragm and a fluid chamber support, the diaphragm chamber, the sealing ring and the diaphragm are located in a cavity between the fluid chamber and the fluid chamber support, and the diaphragm chamber tightly presses the diaphragm on the end face of the fluid chamber support through the sealing ring. A plurality of compression cavities and cavity division positioning ribs located between every two adjacent compression cavities are formed in the diaphragm chamber; ribs corresponding to the cavity dividing positioning ribs are formed on the sealing ring; and the sub-cavity positioning ribs abut against the ribs to enable the ribs to deform and to be pressed on the diaphragm. And the compression amount of the diaphragm in an assembly state is reduced while the sealing isolation between the compression cavities is ensured.

Description

Technical Field

[0001] This utility model relates to the field of diaphragm booster pump technology, and in particular to a pump head structure for a diaphragm pump. Background Technology

[0002] Chinese utility model patent with authorization announcement number CN201739140U discloses a diaphragm chamber structure for a diaphragm pump, which mainly includes an inlet chamber, an outlet chamber, and a compression chamber formed by the cooperation of a fluid chamber, a diaphragm chamber, and diaphragm sheets. The diaphragm chamber and diaphragm sheets form at least three independent compression chambers. In each compression chamber, there is a suction check valve attached to an outlet of the compression chamber and the inlet chamber. Each compression chamber has an outlet that communicates with the corresponding outlet chamber. In each outlet chamber, there is an independent discharge check valve attached to the corresponding outlet.

[0003] In the assembled state, the diaphragm chamber is directly pressed onto the diaphragm. If the clamping force is insufficient, the compression of the diaphragm will also be insufficient. During operation, the deformation of the diaphragm can easily lead to the inability to maintain mutual isolation between the three compression chambers. If the clamping force is too large, the compression of the diaphragm will be too large. The diaphragm will be subjected to excessive pressure for a long time, which will greatly reduce its service life (for example, it will be prone to fatigue failure). In addition, due to excessive pressure, the diaphragm may release some harmful substances into the water, which may cause certain harm to human health. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems by providing a pump head structure for a diaphragm pump that, while ensuring sealed isolation between each compression chamber, reduces the amount of diaphragm compression during assembly.

[0005] To achieve the above objectives, this utility model employs the following technical solution:

[0006] A pump head structure for a diaphragm pump includes a fluid chamber, a diaphragm chamber, a sealing ring, a diaphragm, and a fluid chamber support. The diaphragm chamber, sealing ring, and diaphragm are located in a cavity between the fluid chamber and the fluid chamber support. The diaphragm chamber presses the diaphragm against the end face of the fluid chamber support via the sealing ring. The diaphragm chamber has a plurality of compression chambers and cavity positioning ribs located between adjacent compression chambers. The sealing ring has ribs corresponding to the cavity positioning ribs. The cavity positioning ribs abut against the ribs, causing them to deform and press against the diaphragm.

[0007] Preferably, the rib is provided with a cavity positioning groove adapted to the cavity positioning rib, and the cavity positioning rib is at least partially embedded in the cavity positioning groove.

[0008] Preferably, the diaphragm has a limiting groove at the position corresponding to the rib, and the rib is at least partially embedded in the limiting groove.

[0009] Preferably, the rib has a limiting rib adapted to the limiting groove on the side facing the diaphragm, and the limiting rib is at least partially embedded in the limiting groove.

[0010] Preferably, the limiting rib has wings on both sides, the limiting rib is embedded in the limiting groove, and the top of the two side walls of the limiting groove abuts against the wings.

[0011] Preferably, the sealing ring has a positioning groove on the side facing the diaphragm, and the diaphragm has a positioning rib that matches the positioning groove, and the positioning rib is at least partially embedded in the positioning groove.

[0012] Preferably, a baffle is formed on the edge of the diaphragm chamber, and the side of the baffle is attached to the inside of the sealing ring.

[0013] Preferably, a baffle is formed at the edge of the diaphragm chamber, and a gap is left between the side of the baffle and the inside of the sealing ring.

[0014] Preferably, the gap is 0.2-1 mm.

[0015] Preferably, an outer edge is formed at the edge of the sealing ring, and the fluid chamber presses the edge of the diaphragm against the end face of the fluid chamber support through this outer edge.

[0016] The beneficial effects of this utility model are as follows:

[0017] 1. This utility model provides cavity positioning ribs between two adjacent compression chambers, and provides corresponding ribs on the sealing ring. In the assembled state, the cavity positioning ribs abut against the ribs, causing them to deform and press against the diaphragm. Thus, in the assembled state, the pressure originally borne entirely by the diaphragm is shared by the sealing ring and the diaphragm (i.e., the sealing ring bears a certain amount of force on behalf of the diaphragm, undergoing a certain deformation), thereby reducing the pressure on the diaphragm. This ensures sealing and isolation between the compression chambers while reducing the compression of the diaphragm in the assembled state. On the one hand, this extends the service life of the diaphragm; on the other hand, the reduced force on the diaphragm significantly reduces the probability of harmful substances being released from the diaphragm under pressure.

[0018] 2. The rib is provided with a cavity positioning groove that matches the cavity positioning rib, and the cavity positioning rib is at least partially embedded in the cavity positioning groove. In this way, on the one hand, the cooperation between the cavity positioning rib and the cavity positioning groove achieves the positioning of the sealing ring relative to the diaphragm chamber, preventing the sealing ring from detaching from the sealing contact with the diaphragm chamber during operation; on the other hand, because the cavity positioning rib is embedded in the cavity positioning groove and presses against the bottom of the groove, the deformation of the two side walls of the cavity positioning groove wraps around the cavity positioning rib from both sides, making the fit between the cavity positioning rib and the cavity positioning groove tighter and more stable.

[0019] 3. A limiting groove is provided on the diaphragm at the position corresponding to the rib, and the rib is at least partially embedded in the limiting groove. In this way, on the one hand, the cooperation between the rib and the limiting groove realizes the positioning of the sealing ring relative to the diaphragm, avoiding the separation of the two due to deformation during operation, which would prevent the sealing ring from bearing part of the pressure for the diaphragm; on the other hand, even if a small amount of harmful substances are released after the diaphragm is under pressure, since the pressure point of the diaphragm is located in the limiting groove and is in sealing contact with the sealing ring, the harmful substances are not likely to overflow from the limiting groove and enter the water body.

[0020] 4. A limiting rib is provided on the side of the rib facing the diaphragm, which is adapted to the limiting groove. The limiting rib is at least partially embedded in the limiting groove. In this way, on the one hand, the cooperation between the limiting rib and the limiting groove realizes the positioning of the sealing ring relative to the diaphragm, and avoids the two from separating due to deformation during operation; on the other hand, since the limiting rib is embedded in the limiting groove and presses the bottom of the limiting groove, the deformation of the two side walls of the limiting groove wraps around the limiting rib from both sides, making the fit between the limiting rib and the limiting groove tighter. Even if a small amount of harmful substances are released after the diaphragm is compressed, it is difficult for them to overflow from the limiting groove.

[0021] 5. Wings are formed on both sides of the limiting rib, the limiting rib is embedded in the limiting groove, and the top of the side walls of the limiting groove abuts the wings. In this way, there is a sealing contact between the limiting rib and the side walls of the limiting groove, and at the same time, the top of the side walls of the limiting groove are in sealing contact with the wings, further reducing the possibility of harmful substances escaping from the limiting groove (provided that harmful substances are released from the membrane under pressure). Attached Figure Description

[0022] Figure 1 This is an exploded view of the present invention.

[0023] Figure 2 This is a cross-sectional view of the present invention in its assembled state.

[0024] Figure 3 for Figure 2 Enlarged view of part A.

[0025] Figure 4 This is a cross-sectional view of the diaphragm chamber, sealing ring, and diaphragm in the assembled state of this utility model.

[0026] Figure 5 for Figure 4 Enlarged view of part B.

[0027] Figure 6 This is an exploded view of the diaphragm chamber, sealing ring, and diaphragm in this utility model.

[0028] Figure 7 This is a perspective view of the diaphragm chamber in this utility model.

[0029] Figure 8 The three-dimensional sealing ring in this utility model Figure 1 .

[0030] Figure 9 The three-dimensional sealing ring in this utility model Figure 2 .

[0031] Figure 10 This is a perspective view of the diaphragm in this utility model.

[0032] The markings in the image are as follows:

[0033] Fluid chamber 1;

[0034] Diaphragm chamber 2; Compression chamber 21; Chamber positioning rib 22; Baffle 23;

[0035] 3. Sealing ring; 31. Rib; 32. Cavity positioning groove; 33. Limiting rib; 34. Wing; 35. Positioning groove; 36. Outer edge;

[0036] Diaphragm 4; Limiting groove 41; Positioning rib 42;

[0037] Fluid chamber support 5;

[0038] Gap 6. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of this utility model. Obviously, the described embodiments are some, but not all, embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0040] like Figures 1-10 An example of a diaphragm pump head structure includes a fluid chamber 1, a diaphragm chamber 2, a sealing ring 3, a diaphragm 4, and a fluid chamber support 5.

[0041] like Figures 1-3 As shown, the diaphragm chamber 2, sealing ring 3, and diaphragm 4 are located in the cavity between the fluid chamber 1 and the fluid chamber support 5. The diaphragm chamber 2 presses the diaphragm 4 against the end face of the fluid chamber support 5 via the sealing ring 3. Figures 4-10As shown, the diaphragm chamber 2 has a plurality of compression chambers 21 and cavity positioning ribs 22 located between adjacent compression chambers 21; the sealing ring 3 has ribs 31 corresponding to the cavity positioning ribs 22; the cavity positioning ribs 22 abut against the ribs 31 to deform and press against the diaphragm 4. In some practical applications, the diaphragm chamber 2 has three compression chambers 21, and cavity positioning ribs 22 (three in total) are provided between adjacent compression chambers 21. The sealing ring 3 has three ribs 31 corresponding to the cavity positioning ribs 22, and the three cavity positioning ribs 22 abut against the three ribs 31 respectively to deform and press against the diaphragm 4. Of course, within the scope of those skilled in the art, the diaphragm chamber 2 can also have four, five, or even more compression chambers 21, and a corresponding number of cavity positioning ribs 22 and ribs 31 will be provided accordingly.

[0042] During assembly, because fluid chamber 1 needs to be connected to fluid chamber support 5 via screws, diaphragm chamber 2 is forced to move downwards, pressing the sealing ring 3 and diaphragm 4 (the diaphragm is supported by the fluid chamber support below). The sealing ring 3 is compressed and deformed under pressure (resulting in a significant compression). The remaining pressure is then borne by diaphragm 4. Thus, the pressure originally borne entirely by diaphragm 4 is now shared by both the sealing ring 3 and diaphragm 4 (i.e., the sealing ring bears a certain amount of force and deforms on behalf of the diaphragm), reducing the pressure on diaphragm 4. This ensures a tight seal between the compression chambers 21 while reducing the compression of diaphragm 4 in the assembled state. This extends the service life of diaphragm 4 and significantly reduces the likelihood of harmful substances leaching from diaphragm 4 under pressure. After assembly, both the sealing ring 3 and diaphragm 4 are compressed, maintaining a tight seal between the compression chambers 21. Even if diaphragm 4 deforms under pressure during operation, the seal between the compression chambers 21 will not fail.

[0043] like Figures 4-8 As shown, in some practical applications, the rib 31 is provided with a cavity positioning groove 32 that matches the cavity positioning rib 22, and the cavity positioning rib 22 is at least partially embedded in the cavity positioning groove 32. In this way, on the one hand, the cooperation between the cavity positioning rib 22 and the cavity positioning groove 32 achieves the positioning of the sealing ring 3 relative to the diaphragm chamber 2, preventing the sealing ring 3 from detaching from the sealing contact with the diaphragm chamber 2 during operation; on the other hand, because the cavity positioning rib 22 is embedded in the cavity positioning groove 32 and presses against the bottom of the groove, the deformation of the two side walls of the cavity positioning groove 32 wraps around the cavity positioning rib 22 from both sides, making the cooperation between the cavity positioning rib 22 and the cavity positioning groove 32 tighter and more stable.

[0044] like Figure 1 , Figure 4 , Figure 5, Figure 10 As shown, in some practical applications, a limiting groove 41 is provided on the diaphragm 4 at a position corresponding to the rib 31, and the rib 31 is at least partially embedded in the limiting groove 41. In this way, on the one hand, the cooperation between the rib 31 and the limiting groove 41 is used to position the sealing ring 3 relative to the diaphragm 4, avoiding the two from separating due to deformation during operation, so that the sealing ring 3 can bear part of the pressure for the diaphragm 4; on the other hand, even if a small amount of harmful substances are released after the diaphragm 4 is under pressure, since the pressure point of the diaphragm 4 is located in the limiting groove 41 and is in sealed contact with the sealing ring 3, the harmful substances are not likely to overflow from the limiting groove 41 and enter the water body.

[0045] like Figure 4 , Figure 5 , Figure 6 , Figure 9 , Figure 10 As shown, in some practical applications, the rib 31 has a limiting rib 33 on the side facing the diaphragm 4 that matches the limiting groove 41. The limiting rib 33 is at least partially embedded in the limiting groove 41. In this way, on the one hand, the cooperation between the limiting rib 33 and the limiting groove 41 achieves the positioning of the sealing ring 3 relative to the diaphragm 4, preventing them from separating due to deformation during operation; on the other hand, because the limiting rib 33 is embedded in the limiting groove 41 and presses against the bottom of the groove 41, the deformation of the two side walls of the limiting groove 41 wraps around the limiting rib 33 from both sides, making the fit between the limiting rib 33 and the limiting groove 41 tighter. Even if a small amount of harmful substances are released after the diaphragm 4 is compressed, it is difficult for them to overflow from the limiting groove 41. In other practical applications, the limiting rib 33 has wings 34 formed on both sides. The limiting rib 33 is embedded in the limiting groove 41, and the tops of the two side walls of the limiting groove 41 abut against the wings 34. Thus, the limiting rib 33 is in sealed contact with the two side walls of the limiting groove 41, and the top of the two side walls of the limiting groove 41 is in sealed contact with the wing 34, further reducing the possibility of harmful substances overflowing from the limiting groove 41 (provided that the membrane is under pressure and harmful substances are released).

[0046] like Figures 1-4 , Figure 9 , Figure 10 As shown, in some practical applications, the sealing ring 3 has a positioning groove 35 on the side facing the diaphragm 4, and the diaphragm 4 has a positioning rib 42 that matches the positioning groove 35. The positioning rib 42 is at least partially embedded in the positioning groove 35. In this way, it can play a good positioning role during assembly, which facilitates assembly.

[0047] In some practical applications, a baffle 23 is formed on the edge of the diaphragm chamber 2, and the side of the baffle 23 is attached to the inner side of the sealing ring 3. The baffle 23 supports the inner side of the sealing ring 3, preventing the sealing ring 3 from deforming severely after compression, thus losing its function of dispersing compression. In other practical applications, a baffle 23 is formed on the edge of the diaphragm chamber 2, and a gap 6 is left between the side of the baffle 23 and the inner side of the sealing ring 3, and the gap is 0.2-1mm. In this way, there is a certain gap between the diaphragm chamber 2 and the sealing ring 3, which facilitates assembly, but the small gap does not affect the seal.

[0048] like Figures 1-3 , Figure 8 As shown, in some practical applications, an outer edge 36 is formed at the edge of the sealing ring 3. The fluid chamber 1 presses the edge of the diaphragm 4 against the end face of the fluid chamber support 5 through the outer edge 36 to ensure that the liquid in the pump body does not leak.

[0049] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A pump head structure for a diaphragm pump, comprising a fluid chamber (1), a diaphragm chamber (2), a sealing ring (3), a diaphragm (4), and a fluid chamber support (5), wherein the diaphragm chamber (2), the sealing ring (3), and the diaphragm (4) are located in a cavity between the fluid chamber (1) and the fluid chamber support (5), and the diaphragm chamber (2) presses the diaphragm (4) against the end face of the fluid chamber support (5) via the sealing ring (3), characterized in that: The diaphragm chamber (2) has a plurality of compression chambers (21) and a cavity positioning rib (22) located between two adjacent compression chambers (21); the sealing ring (3) has a rib (31) corresponding to the cavity positioning rib (22); the cavity positioning rib (22) abuts against the rib (31) to deform it and press it against the diaphragm (4).

2. The pump head structure of the diaphragm pump according to claim 1, characterized in that: The rib (31) is provided with a cavity positioning groove (32) that is adapted to the cavity positioning rib (22), and the cavity positioning rib (22) is at least partially embedded in the cavity positioning groove (32).

3. The pump head structure of the diaphragm pump according to claim 1, characterized in that: The diaphragm (4) is provided with a limiting groove (41) at a position corresponding to the rib (31), and the rib (31) is at least partially embedded in the limiting groove (41).

4. The pump head structure of the diaphragm pump according to claim 3, characterized in that: On the rib (31), on the side facing the diaphragm (4), there is a limiting rib (33) that is adapted to the limiting groove (41), and the limiting rib (33) is at least partially embedded in the limiting groove (41).

5. The pump head structure of the diaphragm pump according to claim 4, characterized in that: The limiting rib (33) has wings (34) formed on both sides, the limiting rib (33) is embedded in the limiting groove (41), and the top of the two side walls of the limiting groove (41) abuts against the wings (34).

6. The pump head structure of the diaphragm pump according to claim 1, characterized in that: The sealing ring (3) has a positioning groove (35) on the side facing the diaphragm (4), and the diaphragm (4) has a positioning rib (42) that matches the positioning groove (35), and the positioning rib (42) is at least partially embedded in the positioning groove (35).

7. The pump head structure of the diaphragm pump according to claim 1, characterized in that: A baffle (23) is formed on the edge of the diaphragm chamber (2), and the side of the baffle (23) is attached to the inside of the sealing ring (3).

8. The pump head structure of the diaphragm pump according to claim 1, characterized in that: A baffle (23) is formed on the edge of the diaphragm chamber (2), and a gap (6) is left between the side of the baffle (23) and the inside of the sealing ring (3).

9. The pump head structure of the diaphragm pump according to claim 8, characterized in that: The gap is 0.2-1mm.

10. The pump head structure of the diaphragm pump according to claim 1, characterized in that: An outer edge portion (36) is formed at the edge of the sealing ring (3), and the fluid chamber (1) presses the edge portion of the diaphragm (4) against the end face of the fluid chamber support (5) through the outer edge portion (36).

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