Sealing structure for corrugated pipe pump and corrugated pipe pump

Abstract

The utility model provides a sealing structure for a corrugated pipe pump and the corrugated pipe pump. The technical problem that an existing sealing piece for the corrugated pipe pump is short in service life is solved. The sealing structure comprises a sealing ring body, a first annular groove is formed in the circumferential face of the outer wall of the sealing ring body, and a first compression sealing ring is installed in the first annular groove. The utility model further discloses the corrugated pipe pump comprising the sealing structure. The sealing device can be widely applied to the technical field of bellows pump sealing.

Description

Technical Field

[0001] The present application relates to the technical field of bellows pump seals, and in particular to a bellows pump seal structure and a bellows pump. Background Art

[0002] A bellows pump is a pump that uses the stretching and contraction of a bellows to transport liquid. Existing bellows pumps usually include a housing, a valve core, two bellows and two push plates. A bellows is connected to each side of the valve core, and the other side of the bellows is connected to a push plate. The two push plates are connected by a connecting shaft that runs through the valve core. An air cavity is formed between the housing and the push plate, and the inside of the bellows is connected to the pipeline in the valve core to form a liquid cavity. By alternately introducing compressed gas into the two air cavities of the housing, the push plate drives the bellows to reciprocately squeeze the liquid cavity in the tube under the drive of air pressure, so that the liquid entering from the liquid inlet of the valve core is pressed out from the liquid outlet of the valve core, and the function of transporting liquid is realized through a continuous cycle.

[0003] Among them, a seal is set inside the bellows pump to prevent air leakage and liquid leakage. As we all know, bellows pumps are usually in a relatively harsh working environment for a long time. For example, the long-term working condition of a low-pulsation bellows pump is a high temperature of 180°C, and the conveying medium is mostly highly corrosive liquids such as sulfuric acid and hydrochloric acid, which leads to a short service life of the seal. This technical problem needs to be solved urgently. Summary of the invention

[0004] The purpose of the utility model is to solve the deficiencies of the above-mentioned technology, to provide a sealing structure for a bellows pump and a bellows pump, and to extend the service life of the sealing member.

[0005] To this end, the utility model provides a sealing structure for a bellows pump, the sealing structure comprising a sealing ring body, an outer wall circumferential surface of the sealing ring body is provided with a first annular groove, and a first compression sealing ring is installed in the first annular groove.

[0006] Preferably, a second annular groove is formed on the circumferential surface of the side wall of the sealing ring body, and a second compression sealing ring is installed in the second annular groove.

[0007] Preferably, the outer side of the inner wall circumference of the sealing ring body is provided with a sharp edge extending outward.

[0008] Preferably, the sealing ring body or the first compression sealing ring is made of a self-lubricating non-metallic material.

[0009] A bellows pump comprises the sealing structure for a bellows pump as described in any one of the above items.

[0010] A bellows pump, which includes a driving part. The driving part includes a pump shaft that passes through the pump housing, and the pump shaft is sealingly and slidably connected to the pump housing through a first sealing assembly. The first sealing assembly includes a first annular seal and a second annular seal, and the first annular seal and the second annular seal are adjacent to each other. The first annular seal is provided with the sealing structure for the bellows pump as described above, that is, the sealing structure includes a sealing ring body, and a first annular groove is formed on the outer circumferential surface of the outer wall of the sealing ring body, and a first compression sealing ring is installed in the first annular groove. The second annular seal is provided with the sealing structure for the bellows pump as described above, that is, the sealing structure includes a sealing ring body, a first annular groove is formed on the outer circumferential surface of the outer wall of the sealing ring body, a first compression sealing ring is installed in the first annular groove, second annular grooves are respectively formed on the circumferential surfaces of the left and right side walls of the sealing ring body, second compression sealing rings are installed in the second annular grooves, and the opening of one of the second annular grooves faces the first annular seal.

[0011] Preferably, a sharp corner edge extending outward is provided on the outer side of the inner circumferential surface of the first annular seal and / or the second annular seal.

[0012] Preferably, the sealing ring body of the first annular seal is made of a hard self-lubricating material, and the sealing ring body of the second annular seal is made of a soft self-lubricating material.

[0013] A bellows pump, which includes a driving part. The driving part includes a piston and a cylinder block. The piston is arranged in the cylinder block, the cylinder block is sealingly connected to the pump housing, and the piston is sealingly and slidably connected to the pump housing through a second sealing assembly. The second sealing assembly includes a third annular seal and a fourth annular seal, and the third annular seal and the fourth annular seal are adjacent to each other. The third annular seal is provided with the sealing structure for the bellows pump as described above, that is, the sealing structure includes a sealing ring body, and a first annular groove is formed on the outer circumferential surface of the outer wall of the sealing ring body, and a first compression sealing ring is installed in the first annular groove. The fourth annular seal is provided with the sealing structure for the bellows pump as described above, that is, the sealing structure includes a sealing ring body, a first annular groove is formed on the outer circumferential surface of the outer wall of the sealing ring body, a first compression sealing ring is installed in the first annular groove, a second annular groove is formed on the circumferential surface of one of the side walls of the sealing ring body, a second compression sealing ring is installed in the second annular groove, and the opening of the second annular groove faces the third annular seal.

[0014] Preferably, the sealing ring body of the third annular seal is made of a hard self-lubricating material, and the sealing ring body of the fourth annular seal is made of a soft self-lubricating material.

[0015] The beneficial effects of the present utility model are as follows: The present utility model provides a sealing structure for a bellows pump and a bellows pump. A first annular groove is formed on the outer circumferential surface of the sealing ring body, and a first compression sealing ring is installed in the first annular groove. The first compression sealing ring and the sealing ring body cooperate with each other to delay the failure time of the sealing ring body in high-temperature or corrosive working environments, thereby improving the airtightness of the bellows pump and extending its service life. In addition, the sealing ring body is made of a hard self-lubricating material, which serves as a stress support for the reciprocating motion of the pump shaft or piston, ensuring the stability of its motion; the first compression sealing ring and the second compression sealing ring are both made of soft self-lubricating materials, maximizing the sealing effect of the reciprocating motion of the pump shaft or piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following-described drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 is a schematic structural diagram of Embodiment 1 of the present application;

[0018] Figure 2 is Figure 1 a schematic structural diagram of the A-A cross-sectional view shown;

[0019] Figure 3 is a schematic structural diagram of Embodiment 2 of the present application;

[0020] Figure 4 is Figure 3 a schematic structural diagram of the B-B cross-sectional view shown;

[0021] Figure 5 is Figure 3 a schematic structural diagram of the right view of the view shown;

[0022] Figure 6 is Figure 4 a schematic structural diagram of the enlarged view of Part A shown;

[0023] Figure 7 is a schematic cross-sectional view of Embodiment 3 of the present application;

[0024] Figure 8 is a schematic partial cross-sectional view of Embodiment 4 of the present application;

[0025] Figure 9 is Figure 8 a schematic structural diagram of the enlarged view of Part B shown;

[0026] Figure 10 is Figure 8 a schematic structural diagram of the enlarged view of part C shown in the figure.

[0027] Markings in the figure: 1. Sealing ring body, 2. First annular groove, 3. First compression sealing ring, 4. Second annular groove, 5. Second compression sealing ring, 6. Sharp corner edge, 7. Pump shaft, 8. Pump housing, 9. First sealing assembly, 10. First annular seal, 11. Second annular seal, 12. Piston, 13. Cylinder block, 14. Second sealing assembly, 15. Third annular seal, 16. Fourth annular seal. Specific embodiments

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. The methods used in the present utility model are all conventional methods without special provisions; the raw materials and devices used are all conventional commercially available products without special provisions.

[0029] Embodiment 1

[0030] As shown by Figure 1 and Figure 2 , the present utility model provides a sealing structure for a bellows pump. The sealing structure includes a sealing ring body 1. A first annular groove 2 is formed on the outer circumferential surface of the sealing ring body 1, and a first compression sealing ring 3 is installed in the first annular groove 2.

[0031] During use, the sealing structure of the present utility model is hermetically installed in the annular gap between two components located inside and outside the bellows pump. The first compression sealing ring 3 of the present utility model is fixed in the first annular groove 2 and mainly plays two roles: on the one hand, the first compression sealing ring 3, by its own sealing pressing force, tightly holds the sealing ring body 1 against the outer wall of the inner component, improving the airtightness between the sealing ring body 1 and the inner component and extending the service life; on the other hand, the first compression sealing ring 3, by its own elastic deformation, tightly presses against the inner wall of the outer component, improving the airtightness between the sealing ring body 1 and the outer component and extending the service life.

[0032] Therefore, compared with the existing sealing ring body 1, by forming a first annular groove 2 on the outer circumferential surface of the sealing ring body 1 and installing a first compression sealing ring 3 in the first annular groove 2, the first compression sealing ring 3 and the sealing ring body 1 cooperate with each other, delaying the failure time of the sealing ring body 1 in high-temperature or corrosive working environments, thereby improving the airtightness of the bellows pump and extending the service life.

[0033] The sealing ring body 1 or the first compression sealing ring 3 is preferably a self-lubricating non-metallic material, such as RULON (polytetrafluoroethylene modified material), PTFE (polytetrafluoroethylene), etc., to avoid damage by corrosive media. At the same time, the self-lubricating material greatly reduces the wear rate of the sealing ring body 1, further extending the service life. Those skilled in the art can select the appropriate material of the sealing ring body 1 or the first compression sealing ring 3 according to the actual use environment requirements of the sealing structure for the bellows pump.

[0034] Example 2

[0035] Depend on Figures 3 to 5 As shown, this embodiment is a further limitation of the above-mentioned embodiment 1, in which a second annular groove 4 is formed on the circumferential surface of one of the side walls of the sealing ring body 1, and a second compression sealing ring 5 is installed in the second annular groove 4.

[0036] When in use, the second compression seal ring 5 located on one side of the seal ring body 1 relies on its own sealing and pressing force to cooperate with the first compression seal ring 3 to make the seal ring body 1 tightly hug the outer wall of the inner component, further improving the airtightness between the seal ring body 1 and the inner component and further extending the service life. Those skilled in the art can choose whether the second compression seal ring 5 is set on the left or right side of the seal ring body 1 according to the actual use environment requirements of the bellows pump sealing structure to determine the pressure distribution focus area between the seal ring body 1 and the inner component.

[0037] Depend on Figure 6 As shown, the outer side of the inner wall circumference of the sealing ring body 1 is preferably provided with a sharp edge 6 extending outward. When compressed by the corresponding external compressed gas, the sharp edge 6 will undergo elastic deformation, so that the sharp edge 6 can fully hug the inner part tightly. Even if the sharp edge 6 is aged and deformed during long-term use, resulting in a gap between the sharp edge 6 and the inner part, when compressed by the corresponding external compressed gas, the sharp edge 6 can still be forced to hug the inner part tightly, and the gap generated becomes smaller or eliminated. The sharp edge 6 is provided to further improve the airtightness between the sealing ring body 1 and the inner part, and further extend the service life.

[0038] In addition, the pointed edge 6 can also be applied to the sealing structure for the bellows pump described in Example 1. Its structure and function are the same as those in Example 2 and will not be described again here.

[0039] Example 3

[0040] Depend on Figure 7 As shown, this embodiment is a further limitation of the above-mentioned embodiment 1, and the left and right side wall circumferential surfaces of the sealing ring body 1 are both provided with second annular grooves 4, and a second compression sealing ring 5 is installed in the second annular groove 4.

[0041] During use, the second compression sealing rings 5 located on the left and right sides inside the sealing ring body 1, relying on their own sealing and pressing forces, cooperate with the first compression sealing ring 3 located in the middle of the sealing ring body 1, so that the sealing ring body 1 tightly hugs the outer wall of the inner component as a whole, ensuring that the inner wall circumferential surfaces on the left, middle, and right sides of the sealing ring body 1 closely adhere to the surface of the inner component, further improving the airtightness between the sealing ring body 1 and the inner component and further extending the service life.

[0042] Embodiment 4

[0043] The present utility model provides a bellows pump, which includes the sealing structure for the bellows pump described in any one of the above-mentioned Embodiments 1 to 3.

[0044] During use, those skilled in the art can select the sealing structure for the bellows pump described in any one of the above-mentioned Embodiments 1 to 3 that is adapted to the actual use environment requirements of the sealing structure for the bellows pump to improve the airtightness of the bellows pump and extend the service life. Among them, the sealing structure for the bellows pump described in any one of the above-mentioned Embodiments 1 to 3 can be used alone or in combination.

[0045] Embodiment 5

[0046] As Figure 8 , Figure 9 shown, the present utility model provides a bellows pump, which includes a driving part. The driving part includes a pump shaft 7. The pump shaft 7 passes through the pump housing 8, and the pump shaft 7 and the pump housing 8 are hermetically and slidably connected through a first sealing assembly 9. That is, the pump shaft 7 serves as the inner component, the pump housing 8 serves as the outer component, and the first sealing assembly 9 is hermetically installed in the annular gap between the pump shaft 7 and the pump housing 8. During operation, the pump shaft 7 makes an axial reciprocating motion relative to the pump housing 8.

[0047] The first sealing assembly 9 includes a first annular seal 10 and a second annular seal 11. The first annular seal 10 and the second annular seal 11 are adjacent to each other and jointly seal the annular gap between the pump shaft 7 and the pump housing 8. Among them, the first annular seal 10 is provided with the sealing structure for the bellows pump described in the above-mentioned Embodiment 1; the second annular seal 11 is provided with the sealing structure for the bellows pump described in the above-mentioned Embodiment 3, and the opening of one of the second annular grooves 4 of the second annular seal 11 faces the first annular seal 10.

[0048] Preferably, an outwardly extending sharp corner edge 6 (not shown in the figure) is provided on the outer side of the inner wall circumferential surface of the first annular seal 10 and / or the second annular seal 11. The structure and function of this sharp corner edge 6 are the same as those of the sharp corner edge 6 described in Embodiment 2. Please refer to Figure 6 , and details will not be repeated here.

[0049] The sealing ring body 1 of the first annular seal 10 is preferably made of a hard self-lubricating material, such as a hard self-lubricating material like PTFE (polytetrafluoroethylene), etc., which serves as the stress support for the reciprocating motion of the pump shaft 7 to ensure the stability of the movement of the pump shaft 7. The sealing ring body 1 of the second annular seal 11 is preferably made of a soft self-lubricating material, such as RULON (modified polytetrafluoroethylene material), etc., to maximize the sealing effect of the reciprocating motion of the pump shaft 7.

[0050] Embodiment 6

[0051] As shown by Figure 8 and Figure 10 , the present utility model provides a bellows pump, which includes a driving part. The driving part includes a piston 12 and a cylinder block 13. The piston 12 is arranged inside the cylinder block 13. The cylinder block 13 is hermetically connected to the pump housing 8. The piston 12 and the pump housing 8 are hermetically and slidably connected through a second sealing assembly 14. That is, the piston 12 serves as the inner part, the pump housing 8 serves as the outer part, and the second sealing assembly 14 is hermetically installed in the annular gap between the piston 12 and the pump housing 8. During operation, the piston 12 makes an axial reciprocating motion relative to the pump housing 8.

[0052] The second sealing assembly 14 includes a third annular seal 15 and a fourth annular seal 16. The third annular seal 15 and the fourth annular seal 16 are adjacent to each other to jointly seal the annular gap between the piston 12 and the pump housing 8. Among them, the third annular seal 15 is provided with the sealing structure for the bellows pump as described in the above Embodiment 1; the fourth annular seal 16 is provided with the sealing structure for the bellows pump as described in the above Embodiment 2, and the opening of the second annular groove 4 of the fourth annular seal 16 faces the third annular seal 15.

[0053] The sealing ring body 1 of the third annular seal 15 is preferably made of a hard self-lubricating material, such as a hard self-lubricating material like PTFE (polytetrafluoroethylene), etc., which serves as the stress support for the reciprocating motion of the piston 12 to ensure the stability of the movement of the piston 12. The sealing ring body 1 of the fourth annular seal 16 is preferably made of a soft self-lubricating material, such as RULON (modified polytetrafluoroethylene material), etc., to maximize the sealing effect of the reciprocating motion of the piston 12.

[0054] It should be noted that:

[0055] (1) The present utility model can be used as a static seal for the bellows pump or as a dynamic seal for the bellows pump.

[0056] (2) The sealing structure described in the present utility model can be used as a seal for the bellows pump or equivalently as a seal for other pumps.

[0057] (3) The number and positions of the first annular groove 2 and the second annular groove 4 of the present utility model, as well as the number of the first compression sealing rings 3 in the first annular groove 2 and the number of the second compression sealing rings 5 in the second annular groove 4, can be adjusted by those skilled in the art according to the actual working requirements.

[0058] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "left", "right", "upper", "lower", "top", "bottom", "front", "rear", "inner", "outer", "back", "middle", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. It should be noted that in the above embodiments, the "first", "second", "third", "fourth" do not represent an absolute distinction relationship in terms of structure and / or function, nor do they represent the execution order of sequence, but are only for the convenience of description.

[0059] The above are only the preferred embodiments of the present application, and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A sealing structure for a bellows pump, the sealing structure comprising a sealing ring body (1), characterized in that: A first annular groove (2) is provided on the circumferential surface of the outer wall of the sealing ring body (1), and a first compression sealing ring (3) is installed in the first annular groove (2).

2. A sealing structure for a bellows pump according to claim 1, characterized in that: A second annular groove (4) is provided on the circumferential surface of the side wall of the sealing ring body (1), and a second compression sealing ring (5) is installed in the second annular groove (4).

3. A sealing structure for a bellows pump according to claim 1 or 2, characterized in that: The outer side of the inner wall circumference of the sealing ring body (1) is provided with a sharp edge (6) extending outwards.

4. A sealing structure for a bellows pump according to claim 1, characterized in that: The sealing ring body (1) is made of a self-lubricating non-metallic material.

5. A bellows pump, characterized in that: The invention comprises a sealing structure for a bellows pump as claimed in any one of claims 1 to 4.

6. A bellows pump, comprising a driving unit, wherein the driving unit comprises a pump shaft (7), wherein the pump shaft (7) passes through a pump housing (8), and wherein the pump shaft (7) and the pump housing (8) are sealed and slidably connected via a first sealing assembly (9), wherein: The first sealing assembly (9) comprises a first annular seal (10) and a second annular seal (11), wherein the first annular seal (10) and the second annular seal (11) are adjacent to each other; the first annular seal (10) is provided with a sealing structure for a bellows pump as claimed in claim 1, and the second annular seal (11) is provided with a sealing structure for a bellows pump as claimed in claim 2, and the left and right side wall circumferential surfaces of the second annular seal (11) are respectively provided with the second annular grooves (4), and one of the openings of the second annular grooves (4) faces the first annular seal (10).

7. A bellows pump according to claim 6, characterized in that: The outer side of the inner wall circumference of the first annular seal (10) and / or the second annular seal (11) is provided with a pointed edge (6) extending outwards.

8. A bellows pump according to claim 6, characterized in that: The sealing ring body (1) of the first annular sealing member (10) is made of a hard self-lubricating material, and the sealing ring body (1) of the second annular sealing member (11) is made of a soft self-lubricating material.

9. A bellows pump, comprising a driving unit, the driving unit comprising a piston (12) and a cylinder (13), the piston (12) being disposed in the cylinder (13), the cylinder (13) being sealed and connected to a pump housing (8), the piston (12) and the pump housing (8) being sealed and slidably connected via a second sealing assembly (14), characterized in that: The second sealing assembly (14) includes a third annular seal (15) and a fourth annular seal (16), and the third annular seal (15) and the fourth annular seal (16) are adjacent to each other; the third annular seal (15) is provided with a sealing structure for a bellows pump as claimed in claim 1, and the fourth annular seal (16) is provided with a sealing structure for a bellows pump as claimed in claim 2, and a second annular groove (4) is formed on a circumferential surface of one side wall of the fourth annular seal (16), and the opening of the second annular groove (4) faces the third annular seal (15).

10. A bellows pump according to claim 9, characterized in that: The sealing ring body (1) of the third annular sealing member (15) is made of a hard self-lubricating material, and the sealing ring body (1) of the fourth annular sealing member (16) is made of a soft self-lubricating material.

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