Air bag pump

Abstract

The utility model discloses an air bag pump which comprises a pump head, an air bag, an air bag and an air bag, the air bag is provided with a closed end and an open end; the pump shell is installed on the pump head in a sealed mode, and the pump shell is provided with an outer wall body; one end of the pump shaft is rigidly connected with a mounting plate; a first elastic adjusting piece is arranged between the mounting plate and the closed end of the air bag; the installation plate is detachably fixed to the closed end of the air bag, and the installation plate and the closed end of the air bag oppositely extrude the first elastic adjusting piece so that the air bag and the pump shaft can be kept horizontal. The first elastic adjusting piece is used for making contact with the mounting plate and the closed end of the air bag in an extrusion mode, direct contact between the mounting plate and the closed end of the air bag is replaced, and the elastic deformation quantity of the first elastic adjusting piece can be different when the first elastic adjusting piece is extruded at different positions; therefore, the problem that surface defects such as inclined areas or uneven areas exist on the opposite end faces between the mounting plate and the closed end of the air bag is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of pump equipment, in particular to a wind bag pump. Background Art

[0002] The bellows pump made of fluororesin has been widely used for conveying cleaning liquid for semiconductors. The reciprocating bellows pump generally includes two target fluid chambers, each of which is provided with an expandable or contractible bellows; the target fluid is sucked in or discharged from the target fluid chamber by the expansion or contraction of the bellows. Figure 2 The closed ends of the bellows 12a and 12b have connecting plates 15a and 15b, and the ends of the pump shafts 24a and 24b are rigidly connected with mounting plates 31a and 31b. When the mounting plates 31a and 31b and the connecting plates 15a and 15b of the bellows are detachably fixedly connected, the end faces of the mounting plates 31a and 31b and the end faces of the connecting plates 15a and 15b are in surface-fitting contact.

[0003] However, in the actual manufacturing process, the flatness of the end faces of the mounting plate and the connecting plate cannot be guaranteed. If the end faces of the connecting plate and / or the mounting plate have surface defects such as unevenness, depression, bulging, or tilt, the end face fitting between the connecting plate and the mounting plate will be poor, causing one of the connecting plate and the mounting plate to tilt relative to the horizontal direction relative to the other.

[0004] After the pump shaft and the bellows are rigidly connected by the mounting plate and the connecting plate, one of the pump shaft and the bellows cannot remain horizontal due to the end surface fitting problem between the connecting plate and the mounting plate. The pump shaft is then horizontally penetrated into the outer wall of the pump casing, and the bellows is horizontally installed on the pump head. Under the restriction of the outer wall of the pump casing, the pump shaft can remain horizontal and the mounting plate can remain vertically perpendicular to the pump shaft. Since the bellows is an injection molded part and the strength of the corrugated part is relatively low, if the surface fitting effect between the mounting plate and the connecting plate is not good, the bellows will be twisted and tilted relative to the horizontal direction. During the long-term reciprocating expansion and contraction process of the bellows, the service life of the bellows will be shortened. What's worse, under the action of the high-temperature liquid in the bellows, the corrugated part of the bellows will be broken, resulting in the scrapping of the bellows pump. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, the utility model provides a wind bag pump, which arranges a first elastic adjustment part between the mounting plate and the closed end of the wind bag, and overcomes the problems caused by surface defects such as inclination or unevenness of the end faces of the mounting plate and / or the closed end by squeezing the first elastic adjustment part towards each other, thereby ensuring that the pump shaft and the wind bag remain level after installation, thereby ensuring horizontal reciprocating motion of the wind bag and extending the service life of the wind bag.

[0006] The utility model solves the technical problem by adopting a technical solution: a wind bag pump, comprising:

[0007] A pump head having a liquid inlet flow channel and a liquid outlet flow channel;

[0008] A wind bag having a closed end and an open end, wherein the open end is sealed and connected to an end surface of the pump head to form a subject fluid chamber;

[0009] A pump housing is sealed and mounted on the pump head to form a driving fluid chamber with the outer wall of the wind bag, and the pump housing has an outer wall body;

[0010] A pump shaft, one end of which is rigidly connected to a mounting plate, and the other end of which penetrates the outer wall and is arranged horizontally, so that the pump shaft performs horizontal reciprocating motion as the wind bag expands and contracts horizontally;

[0011] A first elastic adjustment member is provided between the mounting plate and the closed end of the air bag;

[0012] The pump shaft is perpendicular to the mounting plate, and the mounting plate is detachably fixed to the closed end of the wind bag. The mounting plate and the closed end of the wind bag press the first elastic adjustment member toward each other to keep the wind bag and the pump shaft horizontal.

[0013] The utility model provides a wind bag pump, in which a first elastic adjusting member is arranged between a mounting plate and a closed end of the wind bag. When there are surface defects such as tilted or uneven areas on the facing end faces of the mounting plate and / or the closed end, the first elastic adjusting member is utilized to contact and extrude the mounting plate and the closed end of the wind bag respectively, so as to avoid direct surface contact and fitting of the facing end faces of the mounting plate and / or the closed end as much as possible. In addition, the first elastic adjusting member can have different elastic deformation amounts at different positions when being squeezed, so as to overcome the problem of surface defects such as tilted areas or uneven areas between the facing end faces of the mounting plate and the closed end of the wind bag. After the mounting plate, the first elastic adjusting member and the closed end of the wind bag are assembled and connected, the whole is basically completely horizontal. This also ensures that the pump shaft remains horizontal after horizontally penetrating the outer wall of the pump casing and the wind bag is horizontally installed on the pump head. In addition, the pump shaft and the wind bag remain horizontal under the horizontal reciprocating telescopic motion of the wind bag, so as to avoid tilting and twisting of the wind bag relative to the horizontal and breaking of the corrugated part of the wind bag.

[0014] Furthermore, the closed end of the wind bag has an active surface facing the inner end surface of the mounting plate, and at least one of the inner end surface of the mounting plate and the active surface is provided with a first annular groove surrounding the pump shaft, and the first elastic adjustment member is protruded in the first annular groove.

[0015] The provision of the first annular groove realizes the positioning installation of the first elastic adjusting member, ensures that it is assembled in the set position, and avoids the first elastic adjusting member from being greatly offset after being squeezed towards each other by the mounting plate and the closed end; the protruding portion of the first elastic adjusting member in the first annular groove is squeezed, ensuring an effective extrusion connection between the mounting plate and the closed end.

[0016] Furthermore, the inner end surface of the mounting plate has an inclined surface inclined relative to the vertical direction, and at least a portion of the first annular groove is arranged to intersect with the inclined surface.

[0017] With such arrangement, at least a portion of the first elastic adjusting member will pass through the inclined surface of the inner end face of the mounting plate, thereby overcoming the surface fitting problem caused by the inclination of the inner end face of the mounting plate by applying different degrees of extrusion to different positions of the first elastic adjusting member. After the mounting plate and the closed end of the air bag are assembled and connected, the closed end of the air bag is squeezed through the first elastic adjusting member on the inclined surface, and the closed end of the air bag basically does not fit with the contact surface of the inclined surface, so as to reduce the influence of the inclined surface on the closed end of the air bag, so that the air bag and the pump shaft are in a horizontal state after assembly, ensuring that the air bag can maintain a state of horizontal reciprocating telescopic motion even after long-term use.

[0018] Furthermore, the first annular groove is formed on the inner end surface of the mounting plate, and the active surface is a flat surface, which presses the first elastic adjusting member.

[0019] In practical applications, since the mounting plate is formed by metal die-casting and the air bag is formed by injection molding machine processing, the air bag has a relatively high processing precision, and its active surface is most likely to be flat, while the inner end surface of the mounting plate is most likely to be uneven and may have an inclined surface inclined relative to the vertical. When the flat surface is fitted with the uneven inner end surface of the mounting plate, the active surface of the flat surface squeezes the first elastic adjusting part, and the flat surface and the first elastic adjusting part are fully in contact with each other without the need for direct surface contact between the flat surface and the inner end surface of the mounting plate, thereby preventing the air bag from tilting relative to the horizontal and more effectively ensuring that the mounting plate and the air bag are in a horizontal state after assembly.

[0020] Furthermore, the mounting plate has a through hole for the pump shaft to pass through and a mounting groove surrounding the through hole, and the outer diameter of the end of the pump shaft is increased to form a flange accommodated in the mounting groove;

[0021] A second annular groove surrounding the pump shaft is formed on at least one of the bottom surface of the mounting groove and the end surface of the flange, and a second elastic adjustment member is protruded in the second annular groove. The pump shaft is detachably fixed to the mounting plate, and the mounting plate and the flange press the second elastic adjustment member toward each other to keep the pump shaft and the mounting plate perpendicular.

[0022] The arrangement of the mounting groove and the flange facilitates the detachable assembly of the pump shaft and the mounting plate. However, the processing of the mounting groove may result in uneven areas on its bottom surface. When the bottom surface of the mounting groove and the flange end surface are directly fitted together, the assembly between the mounting plate and the pump shaft cannot ensure a vertical connection, thereby adversely affecting the horizontal arrangement of the pump shaft. Therefore, a second elastic adjustment member is arranged between the bottom surface of the mounting groove and the flange end surface. The second elastic adjustment member is squeezed in opposite directions and has different deformation amounts at different positions after being squeezed, so as to effectively overcome the problem of uneven areas on the bottom surface of the mounting groove and the flange end surface. This ensures that after the mounting plate, the second elastic adjustment member and the pump shaft are assembled and connected, the whole is in a basically completely horizontal state, thereby ensuring that the pump shaft and the air bag remain in a horizontal state after assembly, and remain in a horizontal state under the reciprocating telescopic motion of the air bag.

[0023] Furthermore, the first annular groove and the second annular groove are concentrically arranged, the outer diameter of the first annular groove is D1, the outer diameter of the second annular groove is D2, and D1 / D2 is 1.2-3.

[0024] With such an arrangement, the outer diameter of the first elastic adjusting member can be larger than the outer diameter of the second elastic adjusting member, and the first elastic adjusting member can be located radially outside the second elastic adjusting member, so that the radial distance between the first elastic adjusting member and the second elastic adjusting member is of appropriate size. On the one hand, the wind bag is kept level mainly by squeezing the first elastic adjusting member toward each other between the closed end of the wind bag and the inner end face of the mounting plate, because when the diameters of the first elastic adjusting member and the second elastic adjusting member are the same, the area of ​​the closed end of the wind bag squeezing the first elastic adjusting member is larger than the area of ​​the flange squeezing the second elastic adjusting member. On the other hand, the first elastic adjusting member and the second elastic adjusting member cooperate to make the overall connection between the pump shaft and the wind bag in a horizontal state, and the first elastic adjusting member and the second elastic adjusting member are squeezed from the outer ring to the inner ring on the end face of the mounting plate respectively, which is beneficial to keep the pump shaft and the wind bag level as a whole after assembly.

[0025] Furthermore, the first annular groove and / or the second annular groove are / is arranged concentrically with the pump shaft.

[0026] Such arrangement enables the annular first elastic adjusting member and / or the second elastic adjusting member to be concentric with the pump shaft, thereby avoiding an inclined assembly between the mounting plate and the closed end and / or an inclined assembly between the flange and the bottom surface of the mounting groove due to excessive deviation of any elastic adjusting member from the centerline axis of the pump shaft.

[0027] Furthermore, the first elastic adjusting member is an O-ring or a silicone gasket.

[0028] With this arrangement, the first elastic adjustment member is made of simple materials and has sufficient deformation and resilience after being compressed, ensuring that the first elastic adjustment member compressed between the mounting plate and the closed end is adjusted to facilitate the pump shaft and the air bag to remain level after assembly.

[0029] Furthermore, the closed end of the air bag includes a thick portion located on the inner circle and a thin portion located on the outer circle, and the first annular groove is arranged at the thick portion or at a position on the mounting plate opposite to the thick portion.

[0030] Such arrangement allows the thick parts of the mounting plate and the wind bag to fully press the first elastic adjustment member toward each other, avoiding the first elastic adjustment member being arranged too close to the outer ring edge of the closed end of the wind bag, and can better solve the problem that the uneven area on the inner end surface of the mounting plate cannot be effectively surface-fitted and assembled.

[0031] Furthermore, the thin portion is provided with a plurality of mounting holes, and a fixing piece is provided on the end surface of the thin portion away from the mounting plate, the fastener passes through the mounting holes and is threadedly connected to the fixing piece, and the fixing piece abuts against the thin portion.

[0032] With this arrangement, a fixing piece is introduced, and the fixing piece is connected to the fixing piece through the mounting hole, so that the fastener and the fixing piece are directly threadedly connected, and the fixing piece presses the closed end of the air bag in the direction of the mounting plate. The mounting hole on the thin part of the air bag does not need to be directly connected to the fixing piece, which can avoid the problem that the thin part is easily softened in a high temperature environment, resulting in a decrease in the connecting function of the mounting hole. The fixing piece and the fastener realize a clamping and firm connection between the mounting plate and the air bag, and the entire assembly process is simple and the matching structure is stable.

[0033] Furthermore, the wind bag is provided with a pair, which are respectively located at the two ends of the pump head. The end of the pump shaft away from the wind bag is rigidly connected with a movable plate, and the movable plate is perpendicular to the pump shaft. The upper and lower ends of the two movable plates are rigidly connected by a horizontally arranged connecting shaft, and the combined shape of the two movable plates and the two connecting shafts is rectangular.

[0034] During the reciprocating telescopic motion of the air bag, the rectangle formed by the movable plate and the connecting shaft can ensure that the pump shafts at both ends are always in a horizontal state. Conversely, maintaining a horizontal pump shaft will also prevent the two movable plates and two connecting shafts of the rectangle from deforming, that is, they will not deform into, for example, a rhombus, thereby maintaining the stability of the entire rectangle.

[0035] The beneficial effects of the utility model are as follows: a first elastic adjusting member is arranged between the mounting plate and the closed end of the wind bag, and when there are surface defects such as tilted or uneven areas on the end faces facing each other of the mounting plate and / or the closed end, the first elastic adjusting member is utilized to contact and extrude the mounting plate and the closed end of the wind bag respectively, so as to avoid direct surface contact and fitting of the end faces facing each other of the mounting plate and / or the closed end as much as possible, and the first elastic adjusting member can have different elastic deformation amounts at different positions when being squeezed, so as to overcome surface defects such as tilted areas or uneven areas between the mounting plate and the closed end of the wind bag caused by the existence of tilted areas or uneven areas on the facing end faces, so that after the mounting plate, the first elastic adjusting member and the closed end of the wind bag are assembled and connected, the whole thereof is in a basically completely horizontal state, and it is also ensured that the pump shaft remains horizontal after horizontally penetrating the outer wall of the pump casing and the wind bag is horizontally installed on the pump head, and the pump shaft and the wind bag also remain horizontal under the horizontal reciprocating telescopic motion of the wind bag, so as to avoid tilting and twisting of the wind bag relative to the horizontal direction, and avoid breaking of the corrugated part of the wind bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 The present invention is a three-dimensional structural schematic diagram of a bellows pump provided in a specific embodiment of the present invention.

[0037] Figure 2 A cross-sectional view of the location of the pump head of the bellows pump provided in a specific embodiment of the utility model.

[0038] Figure 3 A three-dimensional cross-sectional view of a bellows pump provided in a specific embodiment of the utility model.

[0039] Figure 4 A side view of a wind bag pump provided in a specific embodiment of the utility model Figure 1 .

[0040] Figure 5 for Figure 4 Cross-sectional view in the AA direction.

[0041] Figure 6 for Figure 5 Enlarged view of the structure at B in the figure.

[0042] Figure 7 A side view of a wind bag pump provided in a specific embodiment of the utility model Figure 2 .

[0043] Figure 8 for Figure 7 Cross-sectional view in CC direction.

[0044] Fig. 9 for Figure 8 Enlarged view of the structure at D in .

[0045] Fig.10The structure schematic diagram of the utility model is that the inclined surface of the mounting plate and the action surface of the closed end of the air bag pump press the first elastic adjustment member toward each other. Figure 1 .

[0046] Fig.11 The structure schematic diagram of the utility model is that the inclined surface of the mounting plate and the action surface of the closed end of the air bag pump press the first elastic adjustment member toward each other. Figure 2 .

[0047] Fig.12 It is a schematic diagram of the exploded structure of the mounting plate and the pump shaft, the first elastic adjusting member, and the second elastic adjusting member in a specific implementation manner of the utility model.

[0048] Fig.13 It is a schematic diagram of the three-dimensional structure of the mounting plate in a specific implementation manner of the utility model.

[0049] Among them, 1-inlet and outlet liquid components, 11-pump head, 12-inlet flow channel, 120-inlet pipe, 121-first flow channel, 122-second flow channel, 13-outlet flow channel, 130-outlet pipe, 131-third flow channel, 132-fourth flow channel, 14-check valve, 141-inlet check valve, 142-outlet check valve, 2-wind bag, 21-object fluid chamber, 22-wind bag closed end, 221-action surface, 222-thick part, 223-thin part, 224-mounting hole, 2 3-open end of wind bag, 3-pump housing, 31-driving fluid chamber, 32-outer wall, 4-air inlet and outlet parts, 5-pump shaft, 51-flange, 52-movable plate, 53-connecting shaft, 54-proximity switch, 6-mounting plate, 61-inner end surface of mounting plate, 62-inclined surface, 63-through hole, 64-mounting groove, 65-fixing part, 66-assembly hole, 67-fastener, 71-first elastic adjusting part, 72-second elastic adjusting part, 81-first annular groove, 82-second annular groove. DETAILED DESCRIPTION

[0050] In order to enable those skilled in the art to better understand the solution of the utility model, the following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0051] like Figure 1-Figure 9As shown, a bellows pump at least includes an inlet and outlet liquid assembly 1, a pair of bellows 2, a pair of pump housings 3, an inlet and outlet gas member 4, and a pair of pump shafts 5. The inlet and outlet liquid assembly 1 includes a pump head 11, and an inlet flow channel 12 and an outlet flow channel 13 provided on the pump head 11, and a one-way valve 14 provided on both end surfaces of the pump head 11 to control the directional movement of the fluid. The liquid inlet channel 12 includes a liquid inlet pipe 120, a first channel 121 and a second channel 122. One end of the liquid inlet pipe 120 extends out of the pump housing 3, and the other end thereof is coaxially connected to the first channel 121, and the second channel 122 extends along the thickness direction of the pump head 11; the liquid outlet channel 13 includes a liquid outlet pipe 130, a third channel 131 and a fourth channel 132. One end of the liquid outlet pipe 130 extends out of the pump housing 3, and the other end thereof is coaxially connected to the third channel 131, and the fourth channel 132 extends along the thickness direction of the pump head 11. In the present embodiment, the fourth channel 132 is parallel to the second channel 122.

[0052] The one-way valve 14 includes an inlet one-way valve 141 that can communicate with the inlet flow channel 12 and an outlet one-way valve 142 that can communicate with the outlet flow channel 13. More specifically, a pair of inlet one-way valves 141 are respectively arranged on opposite end surfaces of the pump head 11 and connected to the inlet flow channel 12, and are used to guide the transfer fluid to the target fluid chamber 21; a pair of outlet one-way valves 142 are respectively arranged on opposite end surfaces of the pump head 11 and connected to the outlet flow channel 13, and are used to discharge the transfer fluid from the target fluid chamber 21.

[0053] A pair of wind bags 2 are respectively and telescopically sealed at the two ends of the pump head 11, and the wind bags 2 are perpendicular to the end face of the pump head 11, thereby forming two independent object fluid chambers 21, and a single object fluid chamber 21 is formed by the inner cavity of a single wind bag 2 and one end of the pump head 11. Specifically, the single wind bag 2 has a closed end 22 and an open end 23, and the open end 23 is sealed and connected to the end face of the pump head 11 to form the above-mentioned single object fluid chamber 21. The one-way valve 14 is located in the wind bag 2, so that the liquid in the inlet flow channel 12 can be passed into the object fluid chamber 21 through the inlet one-way valve 141 in the one-way valve 14, and the liquid in the object fluid chamber 21 can be output to the outlet flow channel 13 through the outlet one-way valve 142 in the one-way valve 14. Among them, the wind bag 2 is a bellows made of fluororesin material, and the fluororesin material can be PTFE or PFA.

[0054] A pair of pump housings 3 are respectively sealed and installed at both ends of the pump head 11, and form two independent driving fluid chambers 31 with the outer walls of the two wind bags 2, and the side of the pump housing 3 away from the pump head 11 has an outer wall body 32. Among them, a single driving fluid chamber 31 is surrounded by the outer wall of a single wind bag 2, the inner wall of a single pump housing 3 and the outer wall body 32. The driving fluid in the driving fluid chamber 31 can compress the wind bag 2 to discharge the liquid in the target fluid chamber 21 to the liquid outlet flow channel 13 through the liquid outlet one-way valve 142.

[0055] The two air inlet and outlet parts 4 are respectively arranged on the two pump housings 3 and are respectively connected to the two driving fluid chambers 31 . The air inlet and outlet parts 4 are used to communicate with an external gas supply source to supply driving gas to the driving fluid chambers 31 or exhaust gas from the driving fluid chambers 31 .

[0056] A pair of pump shafts 5 are both arranged horizontally. The pump shaft 5 passes through the outer wall 32 horizontally and forms a sliding seal therewith. The outer wall 32 can limit the pump shaft 5 to remain horizontal. One end of the single pump shaft 5 is rigidly connected to the mounting plate 6, and the pump shaft 5 and the mounting plate 6 are perpendicular to each other. Since the pump shaft 5 is limited to be horizontal, the mounting plate 6 perpendicular to the pump shaft 5 can remain basically vertical. The other end of the pump shaft 5 passes through the outer wall 32 of the pump body 3 and is rigidly connected to the movable plate 52, and the movable plate 52 is perpendicular to the pump shaft 5. The pump shaft 5, the movable plate 52 and the mounting plate 6 can be metal parts. Thereby, the pump shaft 5 performs horizontal reciprocating motion as the wind bag 2 expands and contracts horizontally. In this embodiment, refer to Figure 5 The direction shown in the figure, the left and right extension direction of the air bag 2 is defined as the horizontal direction, and the vertical direction mentioned above refers to the state perpendicular to the horizontal, that is, Figure 5 The up and down directions shown in the figure. Horizontal refers to relative horizontality. A tilt of no more than 10° relative to the horizontal is also within a reasonable error range and should also be considered horizontal. Vertical also refers to relative verticality. A 10° angle deviation between two perpendicular components is also within a reasonable error range and should also be considered vertical between the two components. Vertical also refers to relative verticality. Similarly, a reasonable error is 10°.

[0057] Two connecting shafts 53 are respectively located at the upper and lower ends of the movable plate 52, and are used to rigidly connect the two movable plates 52, so that when one movable plate 52 moves to the right, the other movable plate 52 can also move to the right, or when one movable plate 52 moves to the left, the other movable plate 52 can also move to the left. The connecting shaft 53 is arranged horizontally, and the two movable plates 52 and the two connecting shafts 53 are combined to form a rectangular shape, so that during the reciprocating telescopic movement of the air bag 2, the rectangle formed by the two movable plates 52 and the two connecting shafts 53 can ensure that the pump shafts 5 at both ends are always in a horizontal state.

[0058] Two proximity switches 54 are respectively arranged in the pump housing 3, and are used to detect the movable plate 52. When the left movable plate 52 moves rightward and approaches the proximity switch 54, that is, the left movable plate 52 is detected by the left proximity switch 54, the proximity switch 54 can trigger the stop of the gas supply to the left driving fluid chamber 31; when the right movable plate 52 moves rightward and approaches the proximity switch 54, that is, the right movable plate 52 is detected by the right proximity switch 54, the proximity switch 54 can trigger the stop of the gas supply to the right driving fluid chamber 31.

[0059] The fluid enters the first flow channel 121 and the second flow channel 122 in sequence from the liquid inlet pipe 120 of the liquid inlet flow channel 12, and the one-way valve 14 with the valve core facing the second flow channel 122 serves as a liquid inlet one-way valve 141; in the initial state, both ends of the second flow channel 122 are blocked by the valve cores of the left and right liquid inlet one-way valves 141, and the air pipe of the air inlet and outlet parts 4 on the left pump housing 3 supplies driving gas to the left driving fluid chamber 31, and the air pipe of the air inlet and outlet parts 4 on the right pump housing 3 does not supply gas, and the driving gas in the sealed left driving fluid chamber 31 will squeeze the left wind bag 2, and the left wind bag 2 is compressed, and the left liquid inlet single valve connected to the object fluid chamber 21 in the left wind bag 2 The left side valve 141 is blocked, and the left side liquid outlet one-way valve 142 is opened to discharge the liquid in the left side object fluid chamber 21 from the third flow channel 131. At the same time, the wind bag 2 drives the left side movable plate 52 to move rightward through the left side pump shaft 5, and the left side movable plate 52 drives the right side movable plate 52 to move rightward through the connecting shaft 53. The right side movable plate 52 stretches the right side wind bag 2 through the right side pump shaft 5, and the right side liquid inlet one-way valve 141 connected with the right side object fluid chamber 21 in the right side wind bag 2 is opened to allow the liquid in the second flow channel 122 to pass into the right side object fluid chamber 21, and the right side liquid outlet one-way valve 142 is always in a closed state.

[0060] The above is the discharge of liquid on the left side and the suction of liquid on the right side. When the movable plate 52 on the left side moves a certain distance to the left and is detected by the proximity switch 54 on the left side, the proximity switch 54 on the left side sends a signal to the external controller. The external controller controls the driving gas source to stop the gas supply to the left driving fluid chamber 31, and the driving gas is introduced into the air pipe of the air inlet and outlet parts 4 on the right pump housing 3 to enter the right driving fluid chamber 31. The driving fluid in the right driving fluid chamber 31 squeezes the right wind bag 2 to the left, and the right wind bag 2 is compressed. The liquid inlet check valve 141 connected to the right object fluid chamber 21 is closed, and the liquid outlet check valve 142 is opened to discharge the liquid in the right object fluid chamber 21 from the third flow channel 131. The compressed right wind bag 2 passes through The right pump shaft 5 drives the right movable plate 52 to move to the left, and the right movable plate 52 drives the left movable plate 52 to move to the left through the connecting shaft 53. The left movable plate 52 drives the left wind bag 2 to move to the left through the left pump shaft 5 to stretch. The left wind bag 2 is stretched to discharge the driving gas of the left driving fluid chamber 31 through the air pipe of the air inlet and outlet part 4. At the same time, the left liquid inlet check valve 141 connected to the left object fluid chamber 21 of the left wind bag 2 is opened, and the left liquid outlet check valve 142 is closed to pass the liquid in the second flow channel 122 from the left liquid inlet check valve 141 to the left object fluid chamber 21. When the right movable plate 52 is detected by the right proximity switch 54, the gas supply to the right driving fluid chamber 31 is stopped. Then, the recirculation pair passes the driving gas to the air pipe on the left pump housing 3 to pass into the right driving fluid chamber 31, and the cycle is repeated. The above-mentioned control of the gas is realized by an external controller. The working principle of the above-mentioned bellows pump and the external controller to realize gas control are prior art and will not be described in detail.

[0061] The mounting plate 6 is detachably fixedly connected to the closed end 22 of the air bag 2. In other words, one end of the pump shaft 5 is rigidly connected to the closed end 22 of the air bag 2 through the mounting plate 6. At the same time, a first elastic adjustment member 71 is provided between the mounting plate 6 and the closed end 22 of the air bag 2. When the assembly is completed, the mounting plate 6 and the closed end 22 of the air bag 2 press the first elastic adjustment member 71 toward each other, so that the air bag 2 and the pump shaft 5 remain parallel. In other words, even if one end face of the mounting plate 6 facing the closed end 22 of the wind bag 2 is not a completely vertical plane, or the outer end face of the closed end 22 of the wind bag 2 facing the mounting plate 6 is not a completely vertical plane, or both end faces facing each other of the mounting plate 6 and the closed end 22 of the wind bag 2 are not completely vertical planes, by squeezing the first elastic adjustment member 71, the direct surface contact connection between the mounting plate 6 and the closed end 22 of the wind bag 2 can be transformed into a contact connection by squeezing the first elastic adjustment member 71 toward each other, so that the pump shaft 5 connected to the outer wall body 32 and the wind bag 2 on the pump head 11 are both kept in a horizontal state, avoiding excessive tilting of the corrugated part of the wind bag 2 relative to the horizontal, ensuring that the wind bag 2 is in a horizontally retracted state after long-term use, thereby extending the service life of the wind bag 2.

[0062] To elaborate, during the assembly of the air bag pump, the pump shaft 5 is first rigidly connected to the closed end 22 of the air bag 2 through the mounting plate 6 as a basically horizontal structural unit, and then the open end 23 of the air bag 2 is threadedly connected to the pump head 11, and it is necessary to ensure that the air bag 2 is arranged horizontally, and then the end of the pump shaft 5 away from the mounting plate 6 passes through the outer wall 32 of the pump housing 3 so that the outer wall 32 supports the pump shaft 5, and then it is necessary to ensure that the pump shaft 5 is arranged horizontally as a whole. At this time, the pump shaft 5, the mounting plate 6, and the air bag 2 are all in a horizontal state. After the installation is completed, the pump shaft 5 and the air bag 2 will form a linkage, and the pump shaft 5 will reciprocate horizontally as the air bag 2 expands and contracts horizontally.

[0063] However, the above situation is that the end faces of the mounting plate 6 and the closed end 22 of the air bag 2 facing each other are both completely vertical planes. However, due to the limitation of the actual processing level, the end face of the mounting plate 6 facing the closed end 22 will have an inclined area or an uneven area, and the end face of the closed end 22 facing the mounting plate 6 may also have an uneven area. At this time, the mounting plate 6 and the closed end 22 cannot be completely and effectively fitted to achieve assembly. After the mounting plate 6 and the closed end 22 are detachably fixedly connected, the air bag 2 will inevitably be excessively tilted relative to the horizontal direction. If the air bag 2 is forcibly screwed onto the pump head 11, it will inevitably cause the air bag 2 to be twisted and tilted relative to the horizontal, especially the corrugated part of the air bag 2 will be twisted, which will affect the service life of the air bag 2 during the reciprocating motion of the air bag 2. What's worse, under the action of high-temperature liquid, the corrugated part of the air bag 2 will be broken, making the air bag pump scrapped.

[0064] At this time, a first elastic adjustment member 71 is provided between the mounting plate 6 and the closed end 22 of the air bag 2, and the inclined area or uneven area between the mounting plate 6 and the closed end 22 of the air bag 2 is effectively adjusted by squeezing the first elastic adjustment member 71 toward each other and different deformation amounts at different positions under the squeezing force, that is, different areas can have different deformation amounts under the action of squeezing the mounting plate 6 and the closed end 22 toward each other. For example, when the convex area of ​​the mounting plate 6 and the closed end 22 squeeze the first elastic adjustment member 71 toward each other, it will undergo a greater deformation to compensate for the problem that the mounting plate 6 and the closed end 22 cannot be completely and effectively fitted, so that after the mounting plate 6, the first elastic adjustment member 71, and the closed end 22 of the air bag 2 are assembled and connected, the whole formed by them is basically in a horizontal state, thereby ensuring that the pump shaft 5 and the air bag 2 are both in a horizontal state, and also remain in a horizontal state under the reciprocating telescopic movement of the air bag 2.

[0065] More specifically, the end surface of the mounting plate 6 facing the air bag 2 is defined as the inner end surface 61, and the closed end 22 of the air bag 2 has an action surface 221 facing the inner end surface 61 of the mounting plate 6. At least one of the inner end surface 61 of the mounting plate 6 and the action surface 221 is provided with a first annular groove 81 surrounding the pump shaft 5, and the first elastic adjustment member 71 is convexly disposed in the first annular groove 81. In this embodiment, the first annular groove 81 is provided on the mounting plate 6, and is coaxially disposed with the pump shaft 5. Of course, in other embodiments, the center of the first annular groove 81 may be disposed away from the central axis of the pump shaft 5, and is not specifically limited.

[0066] In practical applications, since the mounting plate 6 is formed by metal die-casting and the air bag 2 is formed by injection molding, the air bag 2 has high machining accuracy, and its action surface 221 is likely to be relatively flat and vertical, that is, the action surface 221 is a flat surface, while the inner end surface 61 of the mounting plate 6 is likely to have an inclined surface 62 that is inclined relative to the vertical. The first annular groove 81 is arranged on the inner end surface of the mounting plate 6, and the flat action surface 221 is used to squeeze the first elastic adjustment member 71, which can more effectively ensure that the air bag 2 and the pump shaft 5 remain in a horizontal state after the mounting plate 6 and the closed end 22 are assembled.

[0067] In one embodiment, Fig.10 As shown, the inner end surface 61 of the mounting plate 6 is in an inclined state as a whole, and it is inclined from top to bottom in the direction close to the closed end 22, that is, the inclined surface 62 extends the entire inner end surface 61 of the mounting plate 6, and at this time, the first annular groove 81 is arranged crosswise with the inclined surface 62, and the dotted line in the figure represents the vertical plane. The closed end 21 of the air bag 2 and the mounting plate 6 press the first elastic adjustment member 71 towards each other, and the first elastic adjustment member 71 and the portion corresponding to the lower side of the inclined surface 62 will be squeezed to a higher degree because the lower side of the inclined surface 62 is closer to the closed end 22.

[0068] In another embodiment, Fig.11 As shown, part of the inner end face 61 of the mounting plate 6 is in an inclined state, and at this time, part of the first annular groove 81 is arranged crosswise with the inclined surface 62, and the dotted line in the figure represents a vertical plane. In other words, at least part of the first annular groove 81 is arranged crosswise with the inclined surface 62, so that at least part of the first elastic adjustment member 71 is located in the uneven area of ​​the inner end face 61 of the mounting plate 6, and then the degree of extrusion of the first elastic adjustment member 71 at different positions is different to overcome the problem caused by the inclination of the inner end face 61, so that after the mounting plate 6 and the closed end 22 of the air bag 2 are assembled and connected, the action surface 221 existing as a flat surface squeezes the first elastic adjustment member 71 in the first annular groove 81 of the inner end face 61 of the mounting plate 6, and finally ensures that the air bag 2 can maintain a horizontal reciprocating telescopic state after long-term use.

[0069] like Figure 6 , Fig. 9 , Fig.12 As shown, the mounting plate 6 has a through hole 63 for the pump shaft 5 to pass through, and a mounting groove 64 surrounding the through hole 63, and the outer diameter of the end of the pump shaft 5 is increased to form a flange 51 accommodated in the mounting groove 64. A second annular groove 82 surrounding the pump shaft 5 is provided on at least one of the bottom surface of the mounting groove 64 (i.e., an end surface of the mounting groove 64 facing the closed end 22) and the end surface of the flange 51, and a second elastic adjustment member 72 is convexly provided in the second annular groove 82. In this embodiment, the second annular groove 82 is located on the bottom surface of the mounting groove 64, and the pump shaft 5 is detachably fixed to the mounting plate 6, and the mounting plate 6 and the flange 51 press the second elastic adjustment member 72 toward each other, thereby keeping the pump shaft 5 and the mounting plate 6 perpendicular.

[0070] Since the processing of the mounting groove 64 will result in uneven areas, the assembly between the mounting plate 6 and the pump shaft 5 cannot ensure that the two are set vertically, which will have an adverse effect on the horizontal setting of the pump shaft 5. Therefore, a second elastic adjustment member 72 is set between the mounting plate 6 and the flange 51. The second elastic adjustment member 72 has different deformation amounts at different positions when squeezed, so as to effectively adjust the uneven area between the mounting plate 6 and the flange 51. After the mounting plate 6, the second elastic adjustment member 72, and the pump shaft 5 are assembled and connected, the whole is in a completely horizontal state, thereby ensuring that the pump shaft 5 and the air bag 2 are both in a horizontal state, and remain in a horizontal state under the reciprocating telescopic motion of the air bag 2.

[0071] The second annular groove 82 is also arranged concentrically and coaxially with the pump shaft 5, so the first annular groove 81 and the second annular groove 82 are arranged concentrically. Fig. 9As shown, the outer diameter of the first annular groove 81 is D1, and the outer diameter of the second annular groove 82 is D2, then D1 / D2 is 1.2-3, and the outer diameter of the first elastic adjusting member 71 is larger than the outer diameter of the second elastic adjusting member 72, and the contact area between the flange 51 and the bottom surface of the mounting groove 64 is smaller than the contact area between the closed end 22 of the air bag 2 and the inner end surface of the mounting plate 6, ensuring that the area of ​​the closed end 22 of the air bag 2 and the mounting plate 6 that squeezes the first elastic adjusting member 71 is larger than the area of ​​the flange 51 that squeezes the second elastic adjusting member 72, ensuring that the flange 51 and the mounting plate 6 as well as the closed end 22 and the mounting plate 6 have a high degree of fit after being connected as a whole, and the closed end 22 and the mounting plate 6 are squeezed by the larger first elastic adjusting member 71, with a large contact area and better adjustment and buffering effects.

[0072] Under the above ratio, the spacing between the first annular groove 81 and the second annular groove 82 will not be too small, and the first elastic adjustment member 71 and the second elastic adjustment member 72 will not be set too concentrated, ensuring that the first elastic adjustment member 71 and the second elastic adjustment member 72 can better compensate for the problem of the uneven area of ​​the entire inner end surface of the mounting plate 6 and the surface fitting and assembly between the closed end 22 and the flange 51, respectively, ensuring that the pump shaft 5, the mounting plate 6 and the air bag 2 are in a horizontal state, and can also maintain a horizontal state during the reciprocating telescopic movement of the air bag 2, thereby extending the service life of the air bag 2. In addition, the spacing between the first annular groove 81 and the second annular groove 82 will not be too large, avoiding the uneven area between the two from being unable to be well adjusted, thereby adversely affecting the assembly of the mounting plate 6 and the closed end 22 and the flange 51.

[0073] The first elastic adjusting member 71 and the second elastic adjusting member 72 are O-rings or silicone gaskets. In this embodiment, O-rings are selected. The first elastic adjusting member 71 and the second elastic adjusting member 72 are both complete annular structures, which are sufficiently squeezed in the circumference of the mounting plate 6 and the closed end 22. They are O-rings or silicone gaskets, which have sufficient deformation and resilience after being compressed, ensuring that the mounting plate 6 and the closed end 22 are adjusted by the first elastic adjusting member 71 and the second elastic adjusting member 72 to form a vertical state, ensuring the horizontal reciprocating movement of the pump shaft 5 and the air bag 2.

[0074] like Figure 6 , Fig. 9As shown, the closed end 22 of the air bag 2 includes a thick portion 222 located in the inner circle and a thin portion 223 located in the outer circle, and the first annular groove 81 is arranged in the thick portion 222, or the first annular groove 81 is arranged on the mounting plate 6 at a position opposite to the thickness 222. In this embodiment, the first annular groove 81 is arranged at a position corresponding to the thick portion 222 on the mounting plate 6, and is close to the junction of the thick portion 222 and the thin portion 223. Such an arrangement ensures that more areas of the mounting plate 6 are fitted with the closed end 22, and also avoids the problem that the first elastic adjustment member 71 is arranged in the thin portion 223, which causes it to be too close to the outer circle edge of the closed end 22 and cannot better compensate for the uneven area of ​​the inner end surface 61 of the mounting plate 6 and cannot be fitted with the closed end 22.

[0075] The thin portion 223 is provided with a plurality of mounting holes 224. Fig.12 As shown, a plurality of assembly holes 66 are also provided at corresponding positions on the mounting plate 6, and a fixing member 65 is provided on the end surface of the thin portion 223 away from the mounting plate 6, and a fastener 67 passes through the assembly hole 66 and the mounting hole 224 and is threadedly connected to the fixing member 65, and the fixing member 65 abuts against the thin portion 223, as shown in FIG. Figure 6 In this embodiment, the fixing member 65 can be formed by splicing two C-shaped structures, and a gap is formed at the splicing position of the two C-shaped structures to facilitate installation.

[0076] If a connecting thread is set in the mounting hole 224 to be threadedly connected with the fastener 67, when the fluid temperature in the air bag 2 is 150℃-180℃, there is a risk that the connecting thread in the mounting hole 224 of the air bag 2 of the injection molded part may soften, causing the fastener 67 and the thread in the mounting hole 224 to lose effective connection. The fixing part 65 is introduced, and the threaded hole is set on the fixing part 65, so that the fastener 67 and the fixing part 65 are directly threadedly connected. The fixing part 65 presses the closed end 22 of the air bag 2 in the direction of the mounting plate 6, which can ensure the stable connection between the mounting plate 6 and the air bag 2 in a high temperature environment, and the entire assembly process is simple and the matching structure is stable.

[0077] The above specific implementation modes are used to explain the present invention rather than to limit the present invention. Any modification and change made to the present invention within the spirit of the present invention and the protection scope of the claims shall fall within the protection scope of the present invention.

Claims

1. A bellows pump, comprising: A pump head having a liquid inlet flow channel and a liquid outlet flow channel; A wind bag having a closed end and an open end, wherein the open end is sealed and connected to an end surface of the pump head to form a subject fluid chamber; The pump housing is sealed and mounted on the pump head, and forms a driving fluid chamber with the outer wall of the wind bag. The pump housing has an outer wall body; the characteristics are: A pump shaft, one end of which is rigidly connected to a mounting plate, and the other end of which penetrates the outer wall and is arranged horizontally, so that the pump shaft performs horizontal reciprocating motion as the wind bag expands and contracts horizontally; A first elastic adjustment member is provided between the mounting plate and the closed end of the air bag; The pump shaft is perpendicular to the mounting plate, and the mounting plate is detachably fixed to the closed end of the wind bag. The mounting plate and the closed end of the wind bag press the first elastic adjustment member toward each other to keep the wind bag and the pump shaft horizontal.

2. The bellows pump according to claim 1, characterized in that: The closed end of the air bag has an action surface facing the inner end surface of the mounting plate, and at least one of the inner end surface of the mounting plate and the action surface is provided with a first annular groove surrounding the pump shaft, and the first elastic adjustment member is protruded in the first annular groove.

3. The bellows pump according to claim 1 or 2, characterized in that: The inner end surface of the mounting plate has an inclined surface inclined relative to the vertical direction, and at least a portion of the first annular groove is arranged to intersect with the inclined surface.

4. The bellows pump according to claim 2, characterized in that: The first annular groove is formed on the inner end surface of the mounting plate, and the active surface is a flat surface, which presses the first elastic adjusting member.

5. The bellows pump according to claim 2, characterized in that: The mounting plate has a through hole for the pump shaft to pass through and a mounting groove surrounding the through hole, and the outer diameter of the end of the pump shaft is increased to form a flange accommodated in the mounting groove; A second annular groove surrounding the pump shaft is formed on at least one of the bottom surface of the mounting groove and the end surface of the flange, and a second elastic adjustment member is protruded in the second annular groove. The pump shaft is detachably fixed to the mounting plate, and the mounting plate and the flange press the second elastic adjustment member toward each other to keep the pump shaft and the mounting plate perpendicular.

6. The bellows pump according to claim 5, characterized in that: The first annular groove and the second annular groove are concentrically arranged, the outer diameter of the first annular groove is D1, the outer diameter of the second annular groove is D2, and D1 / D2 is 1.2-3.

7. The bellows pump according to claim 5, characterized in that: The first annular groove and / or the second annular groove are arranged concentrically with the pump shaft.

8. The bellows pump according to claim 1 or 2, characterized in that: The first elastic adjusting member is an O-ring or a silicone gasket.

9. The bellows pump according to claim 2, characterized in that: The closed end of the air bag includes a thick portion located at the inner circle and a thin portion located at the outer circle, and the first annular groove is arranged at the thick portion or at a position on the mounting plate opposite to the thick portion.

10. The bellows pump according to claim 9, characterized in that: The thin portion is provided with a plurality of mounting holes, and a fixing piece is provided on the end surface of the thin portion away from the mounting plate. The fastener passes through the mounting holes and is threadedly connected with the fixing piece, and the fixing piece abuts against the thin portion.

11. The bellows pump according to claim 1, characterized in that: The wind bag is provided with a pair, which are respectively located at the two ends of the pump head. The end of the pump shaft away from the wind bag is rigidly connected with a movable plate, and the movable plate is perpendicular to the pump shaft. The upper and lower ends of the two movable plates are rigidly connected by a horizontally arranged connecting shaft, and the combined shape of the two movable plates and the two connecting shafts is rectangular.

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