Piston assembly for pneumatic booster pump and two-stage pneumatic booster pump with same

Abstract

The piston assembly for the pneumatic booster pump is characterized in that two opposite sides of a large piston are respectively connected with a piston rod, a pair of small pistons are respectively connected to a pair of piston rods, and connecting seats of the small pistons are connected with the piston rods; the mounting base comprises a base connected with the connecting base and a positioning rod arranged on the base, the multiple filling rings are arranged on the positioning rod in an abutting and sleeving mode, annular grooves are formed in the peripheral side walls of at least part of the filling rings, sealing pieces are arranged in the grooves, and bolts are locked on the positioning rod and press the filling rings at the ends. The piston reciprocating in the pressurizing cavity of the pneumatic pressurizing pump is arranged to be of an assembled structure, the integral piston is formed through matching of a plurality of filling rings, repair and maintenance are facilitated, use cost can be reduced, the sealing rings are arranged in the grooves in the lateral edges of the filling rings, the sealing rings are convenient to install, and service life of the pneumatic pressurizing pump is prolonged. The service life of the sealing ring can be prolonged, and the sealing effect of the booster cavity is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic booster pump technology, and in particular to a piston assembly for a pneumatic booster pump and a two-stage pneumatic booster pump having the same. Background Technology

[0002] A pneumatic booster pump is a simple and reliable pressure boosting device that uses compressed air as its power source, requires no electricity, and uses fluids such as air or high-purity gases as the boosted medium. The working principle of a pneumatic booster pump is as follows: when gas enters the pump, the valve core of the booster control valve starts to operate, controlling the movement of the piston. With the reciprocating motion of the piston, the gas is compressed and the pressure gradually increases.

[0003] In the prior art, such as the two-stage air booster pump with application number 201821749625.8 and the gas-liquid booster pump with application number 201910046855.0, the pistons used in the booster chamber are all one-piece structures. If the piston is damaged during maintenance, the entire piston needs to be replaced, which increases the cost of use. Moreover, the seals fitted on the piston need to be deformed by external support before being fitted on the piston, so seals with a certain degree of elastic deformation are required, which affects the range of seals to be selected. Utility Model Content

[0004] The purpose of this utility model is to provide a piston assembly for a pneumatic booster pump and a two-stage pneumatic booster pump having the assembly. The piston, which moves back and forth in the booster chamber of the pneumatic booster pump, is set as an assembly structure. Multiple filling rings cooperate to form an integral piston, which facilitates maintenance and reduces operating costs. The sealing ring is set in the groove on the side edge of the filling ring, which facilitates the installation of the sealing ring, improves the service life of the sealing ring, and ensures the sealing effect of the booster chamber.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: a piston assembly for a pneumatic booster pump, comprising:

[0006] The large piston has piston rods connected to its opposite sides.

[0007] Small pistons, a pair of which are respectively connected to a pair of piston rods on the side away from each other, each small piston includes a connecting seat, a mounting seat, a bolt, and a filling ring. The connecting seat is connected to the piston rod. The mounting seat includes a base connected to the connecting seat and a positioning rod disposed on the base. A plurality of filling rings are sleeved on the positioning rod in an abutment manner. At least a portion of the periphery of the filling rings is provided with a ring-shaped groove. A sealing element is provided in the groove. The bolt is locked to the positioning rod and presses the filling ring at the end.

[0008] As a further optimization, the sealing element is a sealing ring.

[0009] As a further optimization, at least one of the filling rings has an annular groove on one side edge away from the positioning rod, which facilitates the installation of the seal and allows the seal to be placed on the small piston without deformation.

[0010] As a further optimization, at least one of the filling rings has an annular groove on one side edge away from the positioning rod, and a collar is provided in the groove.

[0011] As a further optimization, at least one annular plane of the filling ring is provided with a first annular positioning groove, and a sealing ring is provided in the first annular positioning groove to improve the sealing performance between the filling ring and adjacent components.

[0012] As a further optimization, the large piston includes a clamping plate and end caps connected to opposite sides of the clamping plate. The end caps are connected to the piston rod. At least one annular groove is provided on the periphery of the clamping plate, and a sealing ring is provided in the groove.

[0013] As a further optimization, a second annular positioning groove is provided on the side wall of the clamp plate near the end cap, and a sealing ring is provided in the second annular positioning groove to improve the sealing between the clamp plate and the end plate.

[0014] This utility model also provides a two-stage pneumatic booster pump, comprising:

[0015] The housing includes a drive chamber located in the middle, and a first pressurizing chamber and a second pressurizing chamber located on both sides of the drive chamber and communicating with the drive chamber. The outlet of the first pressurizing chamber and the inlet of the second pressurizing chamber are connected through a first conduit.

[0016] The drive module includes a pneumatic control valve, striking pins, an airflow duct, and an exhaust assembly. The pneumatic control valve is connected to the drive chamber via the airflow duct. A pair of striking pins are respectively disposed on opposite sides of the drive chamber and extend into the airflow duct. The exhaust assembly is connected to the pneumatic control valve.

[0017] A piston assembly for a pneumatic booster pump, wherein a large piston is reciprocally movable within the drive chamber, and a pair of small pistons are reciprocally movable within the first booster chamber and the second booster chamber, respectively.

[0018] As a further optimization, the exhaust assembly includes a first interlayer and a second interlayer respectively disposed outside the first and second booster chambers. The first and second interlayers are connected by a second conduit. The second interlayer is connected to the pneumatic control valve through an exhaust pipe. The first interlayer is connected to an exhaust port. A muffler is provided on the exhaust port.

[0019] As a further optimization, the housing is provided with an oil inlet, which allows for oil filling without stopping the machine.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The piston that reciprocates within the booster chamber of the pneumatic booster pump is designed as an assembly structure, forming an integral piston through the cooperation of multiple filling rings, which facilitates maintenance and reduces operating costs;

[0022] 2. In a specific embodiment, the groove formed on the side edge of the filler ring is used to embed the sealing ring, and the sealing ring is positioned by the abutment between the filler ring and the adjacent component. This facilitates the installation of the sealing ring, and also allows for the selection of a more wear-resistant sealing ring, thereby improving the sealing performance in the pressurization chamber and the service life of the sealing ring. Attached Figure Description

[0023] Figure 1 This is a structural diagram of the piston assembly for the pneumatic booster pump of this utility model.

[0024] Figure 2 This is a cross-sectional view of the small piston in the piston assembly of the pneumatic booster pump of this utility model.

[0025] Figure 3 This is a structural diagram of the mounting base in the piston assembly of the pneumatic booster pump of this utility model.

[0026] Figure 4 This is a cross-sectional view of the large piston in the piston assembly of the pneumatic booster pump of this utility model.

[0027] Figure 5 This is a structural diagram of the two-stage pneumatic booster pump of this utility model.

[0028] Figure 6 This is a cross-sectional view of the two-stage pneumatic booster pump of this utility model. Detailed Implementation

[0029] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0030] like Figures 1 to 3As shown, a piston assembly for a pneumatic booster pump includes a large piston 11, a piston rod 12, and small pistons 13. The large piston 11 has piston rods 12 connected to opposite sides of each other. A pair of small pistons 13 are connected to the piston rods 12 on opposite sides. Each small piston 13 includes a connecting seat 131, a mounting seat 132, bolts 133, and filling rings. The connecting seat 131 is connected to the piston rods 12. The mounting seat 132 includes a base 1321 connected to the connecting seat 131 and a positioning rod 1322 mounted on the base 1321. The positioning rod 1322 is coaxial with the base 1321 and has a smaller diameter than the base 1321. Multiple filling rings are fitted abuttingly onto the positioning rod 1322. Each filling ring includes at least a first end filling ring 1341, a second end filling ring 1342, and a middle filling ring 1343. At least one first end filling ring 1341 is fitted onto the positioning rod 1322 with one end face facing the base. The seat 1321 abuts against each other. The middle filling ring 1343 is sleeved on the positioning rod 1322 and one end face abuts against the end face of the first end filling ring 1341. At least one second end filling ring 1342 is sleeved on the positioning rod 1322 and one end face abuts against the middle filling ring 1343. The bolt 133 includes a cap 1331 and a screw 1332 disposed on the cap 1331. The screw 1332 is screwed into the locking hole 13 of the positioning rod 1322. Within 20, the cap body 1331 is fixed and abuts against the second end filling ring 1342. Multiple filling rings are tightly set on the positioning rod 1322 by the action of bolts 133. At least some of the filling rings (such as the first end filling ring 1341 and the second end filling ring 1342) have a ring-shaped groove 134a on their periphery side wall. A sealing element 1351 is provided in the groove 134a. The sealing element 1351 can be a sealing ring.

[0031] In this invention, the small piston 13, which reciprocates within the pressurization chamber of the pneumatic booster pump, is configured as an assembly of multiple filling rings. The multiple filling rings are tightly abutted and fixed by the positioning rod 1322 and bolts 133 to form a small piston 13 of a certain length. Under the premise of normal overall piston function, even if the sidewall of a filling ring is damaged due to contact / collision with the inner wall of the pressurization chamber, or damage occurs during disassembly / maintenance, only the filling ring at the corresponding position needs to be replaced, without replacing the entire small piston 13, thus reducing usage and maintenance costs. Furthermore, the assembly structure of the filling rings allows for adjustment and modification of the outer diameter of the small piston 13. For example, using a filling ring with a larger outer diameter increases the overall outer diameter of the small piston 13, thereby changing the contact area with the gas and adjusting the pressurization ratio. This design can be applied to pressurization chambers with different inner diameters, thus providing greater applicability.

[0032] Preferably, at least one filling ring has a ring-shaped groove 134a at a side edge away from the positioning rod 1322. For example, the groove 134a formed on the first end filling ring 1341 and the second end filling ring 1342 is not located in the middle of the side wall of the filling ring, but is formed on one side edge. This position setting allows the seal 1351 to be installed on the filling ring without external support. Instead, the seal 1351 can be installed in the groove 134a in a state without deformation or with only small deformation. The seal 1351 is positioned on the small piston 13 by the abutment between the filling rings or between the filling ring and the base through the assembly of the small piston 13. This installation method allows for more selection of the seal 1351, such as choosing a material that is less elastic and has less deformation capacity but is more wear-resistant, thereby improving the service life of the seal 1351.

[0033] Furthermore, at least one filling ring has an annular groove 134b on one side edge away from the positioning rod 1322, and a collar 1344 is provided in the groove 134b. Specifically, the groove 134b is provided on the outer wall of the middle filling ring 1343, and the collar 1344 is provided in the groove 134b, so that the middle filling ring 1343 at least at the part position forms an inner and outer layer structure. With this configuration, even if the outer wall of the middle filling ring 1343 is damaged, only the outer collar 1344 needs to be replaced.

[0034] In addition, a first annular positioning groove 134c may be provided on at least one annular plane of the filling ring, such as on the annular plane adjacent to each other between the first end filling ring 1341, the second end filling ring 1342 or the middle filling ring 1343, or on the annular plane adjacent to the base 1321 and the cap 1331. A sealing ring, such as a first embedded sealing ring 1352, is provided in the first annular positioning groove 134c, which can improve the sealing between adjacent assembled parts on the small piston 13.

[0035] Similarly, such as Figure 4 As shown, the large piston 11 includes a clamping plate 112 and end caps 111 connected to opposite sides of the clamping plate 112. The end caps 111 are connected to the piston rod 12. At least one annular groove 112a is provided on the periphery of the clamping plate 112. The groove 112a can also be located on the side edge of the clamping plate 112. A sealing ring is provided in the groove 112a. The sealing ring is an external sealing ring 1131. The above arrangement realizes the assembly structure of the large piston 11 on the one hand. On the other hand, the external sealing ring 1131 can also be placed in the groove 112a without deformation or with only small deformation and be positioned by the assembly structure. This allows it to be made of a material that is less elastic and has less deformation capacity but is more wear-resistant.

[0036] Furthermore, a second annular positioning groove 112b is provided on one side wall of the clamping plate 112 near the end cover 111. A sealing ring is provided in the second annular positioning groove 112b. The sealing ring is a second embedded sealing ring 1132, which is used to improve the sealing between the cover plate 111 and the clamping plate 112.

[0037] like Figure 5 and Figure 6 As shown, this utility model also provides a two-stage pneumatic booster pump, including a housing 20. The housing 20 includes a drive chamber 201 located in the middle, and a first booster chamber 202 and a second booster chamber 203 located on both sides of the drive chamber 201 and connected to the drive chamber 201. The outlet 20b of the first booster chamber 202 and the inlet (not shown) of the second booster chamber 203 are connected through a first conduit (not shown). The drive module 30 includes a pneumatic control valve 31, a striker 32, an airflow pipe 301, and an exhaust assembly 302. The pneumatic control valve 31 is connected to the drive chamber 201 through the airflow pipe 301. A pair of strikers 32 are respectively disposed on opposite sides of the drive chamber 201 and extend into the airflow pipe 301. The exhaust assembly 302 is connected to the pneumatic control valve 31. A large piston 11 is reciprocally movable and disposed in the drive chamber 201. A pair of small pistons 13 connected to it through a piston rod 12 are reciprocally movable and disposed in the first booster chamber 202 and the second booster chamber 230, respectively.

[0038] In this invention, the working principle of the two-stage pneumatic booster pump is the same as that of the prior art. Gas at a certain pressure enters the pneumatic control valve 31 and then enters the drive chamber 201 through the airflow pipe 301. The gas pushes the large piston 11 to move within the drive chamber 201. Through the cooperation of the large piston 11 and the two striking pins 32, and the regulation of the airflow pipe 301 by the two striking pins 32, gas is respectively filled into and discharged from the chambers located on both sides of the large piston 11 within the drive chamber 201, causing the large piston 11 to reciprocate within the drive chamber 201, thereby driving a... The small piston 13 moves back and forth in the first pressurization chamber 202 and the second pressurization chamber 203 respectively. The fluid that needs to be pressurized enters the first pressurization chamber 202 from the inlet 20a, and is pressurized for the first time by the action of the small piston 13. It then enters the second pressurization chamber 203 from the outlet 20b of the first pressurization chamber 202 through the first conduit (not shown). It is pressurized for the second time by the action of another small piston 13, and is output as high-pressure fluid from the outlet 20c of the second pressurization chamber 203.

[0039] Preferably, the exhaust assembly 302 includes a first interlayer 3021 and a second interlayer 3022 respectively disposed outside the first pressurization chamber 202 and the second pressurization chamber 203. The first interlayer 3021 and the second interlayer 3022 are connected through a second conduit 3023. The second interlayer 3022 is connected to the pneumatic control valve 31 through an exhaust pipe 3024. The first interlayer 3021 is connected to an exhaust port, and a silencer pipe 3025 is provided on the exhaust port. The exhaust gas enters the exhaust pipe 3024, the second interlayer 3022, the second conduit 3023, the first interlayer 3021, the exhaust port and the silencer pipe 3025 in sequence to complete the exhaust action. At the same time, heat dissipation is achieved for the second pressurization chamber 203 and the first pressurization chamber 202, and noise reduction is also achieved.

[0040] In addition, the housing 20 is provided with an oil inlet 20d, which can add lubricating oil into the housing 20 for lubrication, ensuring that the piston rod 12 moves smoothly on the bearing.

[0041] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A piston assembly for a pneumatic booster pump, characterized in that, include: The large piston has piston rods connected to its opposite sides. Small pistons, a pair of which are respectively connected to a pair of piston rods on the side away from each other, each small piston includes a connecting seat, a mounting seat, a bolt, and a filling ring. The connecting seat is connected to the piston rod. The mounting seat includes a base connected to the connecting seat and a positioning rod disposed on the base. A plurality of filling rings are sleeved on the positioning rod in an abutment manner. At least a portion of the periphery of the filling rings is provided with a ring-shaped groove. A sealing element is provided in the groove. The bolt is locked to the positioning rod and presses the filling ring at the end.

2. The piston assembly for the pneumatic booster pump according to claim 1, characterized in that, The sealing element is a sealing ring.

3. The piston assembly for the pneumatic booster pump according to claim 1, characterized in that, At least one of the filling rings has an annular groove on one side edge away from the positioning rod.

4. The piston assembly for a pneumatic booster pump according to claim 1 or 3, characterized in that, At least one of the filling rings has an annular groove on one side edge away from the positioning rod, and a collar is provided in the groove.

5. The piston assembly for the pneumatic booster pump according to claim 1, characterized in that, The filling ring has a first annular positioning groove on at least one annular plane, and a sealing ring is provided in the first annular positioning groove.

6. The piston assembly for the pneumatic booster pump according to claim 1, characterized in that, The large piston includes a clamping plate and end caps connected to opposite sides of the clamping plate. The end caps are connected to the piston rod. At least one annular groove is provided on the periphery of the clamping plate, and a sealing ring is provided in the groove.

7. The piston assembly for the pneumatic booster pump according to claim 6, characterized in that, The clamp plate has a second annular positioning groove on the side wall near the end cap, and a sealing ring is provided in the second annular positioning groove.

8. A two-stage pneumatic booster pump, characterized in that, include: The housing includes a drive chamber located in the middle, and a first pressurizing chamber and a second pressurizing chamber located on both sides of the drive chamber and communicating with the drive chamber. The outlet of the first pressurizing chamber and the inlet of the second pressurizing chamber are connected through a first conduit. The drive module includes a pneumatic control valve, striking pins, an airflow duct, and an exhaust assembly. The pneumatic control valve is connected to the drive chamber via the airflow duct. A pair of striking pins are respectively disposed on opposite sides of the drive chamber and extend into the airflow duct. The exhaust assembly is connected to the pneumatic control valve. The piston assembly for the pneumatic booster pump according to any one of claims 1 to 7, wherein the large piston is reciprocally movable within the drive chamber, and the pair of small pistons are respectively reciprocally movable within the first booster chamber and the second booster chamber.

9. The two-stage pneumatic booster pump according to claim 8, characterized in that, The exhaust assembly includes a first interlayer and a second interlayer respectively disposed outside the first and second pressurization chambers. The first and second interlayers are connected by a second conduit. The second interlayer is connected to the pneumatic control valve through an exhaust pipe. The first interlayer is connected to an exhaust port. A muffler is provided on the exhaust port.

10. The two-stage pneumatic booster pump according to claim 9, characterized in that, The casing is provided with an oil inlet.

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