A piston pump with a first-open-first-close sealing structure

Abstract

The present invention discloses a piston pump with an open-first-close sealing structure; it comprises a piston cylinder housing, a cavity is provided in the piston cylinder housing, a sealing assembly and a piston assembly are inserted in the cavity, and a driving member is also provided in the cavity, the driving member can first drive the sealing assembly to move to the limit position, and then drive the piston assembly to move; the present invention overcomes the problem that the one-way valve made of elastic material has obvious hysteresis in deformation, so that before the piston pump performs an air intake operation, the suction port is already in an open state and the discharge port is already in a closed state; before the piston pump performs an exhaust operation, the suction port is already in a closed state and the discharge port is already in an open state. The efficiency loss of the piston pump caused by the hysteresis problem of the one-way valve is reduced or even eliminated, so that the piston pump can operate at a higher rate.

Description

Technical Field

[0001] The invention relates to a piston pump, in particular to a piston pump with an open-first-close sealing structure. Background Art

[0002] The structure of a traditional piston pump includes: a piston drive rod, a piston, and a piston cylinder. The piston cylinder is provided with a suction port and a discharge port. A valve structure is provided at the suction port and the discharge port of the piston cylinder. Its function is to keep the channel of the suction port in an open state and the channel of the discharge port in a closed state during the process of the piston pump sucking in the medium; and to keep the channel of the discharge port in an open state and the channel of the suction port in a closed state during the process of the piston pump discharging the medium. Only in this way can the operation of sucking in the medium be completed. The valve structures of the suction port and discharge port of the existing piston pump are generally one-way valves made of elastic materials, and their working principle is: the installation directions of the one-way valves of the suction port and the discharge port are opposite; in the process of the piston pump sucking in the medium, the one-way valve of the suction port is elastically deformed toward the inside of the piston cylinder under the action of negative pressure, so that the one-way valve of the suction port is in an open state; the one-way valve of the discharge port is pressed by the air pressure outside the cylinder under the action of negative pressure to produce elastic deformation and fit closely to the discharge port, thereby sealing the channel of the discharge port, thereby making the channel of the discharge port in a closed state; in the process of the piston pump discharging the medium, the one-way valve of the suction port is elastically deformed toward the outside of the piston cylinder under the action of the internal pressure of the piston cylinder to fit closely to the suction port, thereby sealing the channel of the suction port, thereby making the channel of the suction port in a closed state; the one-way valve of the discharge port is pushed open under the action of the internal pressure of the piston cylinder, so that the channel of the discharge port is in an open state.

[0003] However, due to the material of the one-way valve made of elastic material, its deformation has obvious hysteresis, that is, at the last moment when the piston pump completes the operation of sucking the medium, the one-way valve at the suction port is in an open state; the one-way valve at the discharge port is in a closed state; the piston will immediately enter the process of discharging the medium under the action of the drive rod, but because the closing and opening of the one-way valve are completed by its own deformation, at this time, the one-way valve at the suction port changes from open to closed, and the one-way valve at the discharge port changes from closed to open, which both require time to complete and cannot enter the corresponding state immediately. This is the hysteresis of the one-way valve. Due to the existence of such hysteresis, when the piston pump enters the discharge state from the suction state, there is a small period of time when the one-way valve at the suction port is still in an open state, and the one-way valve at the discharge port is still in a closed state, that is, when the piston compresses the medium, a part of the medium will flow along the suction port to the outside of the suction end, thereby causing efficiency loss. Such efficiency loss will be more obvious when the driving speed of the piston drive rod is faster, thereby restricting the efficiency of the high-speed operation of the piston pump. Summary of the invention

[0004] The object of the present invention is to provide a piston pump with an open-first-close sealing structure in view of the above-mentioned defects in the prior art.

[0005] In order to solve the above-mentioned defects of the prior art, the technical solution provided by the present invention is: a piston pump with a first-open-first-close sealing structure, comprising a piston cylinder housing, a cavity is provided in the piston cylinder housing, a sealing assembly and a piston assembly are penetrated in the cavity, and a driving member is also provided in the cavity, and the driving member can first drive the sealing assembly to move to the extreme position and then drive the piston assembly to move;

[0006] The process of the sealing assembly and the piston assembly moving downward is the air intake process of the cavity, and the process of the sealing assembly and the piston assembly moving upward is the air exhaust process of the cavity.

[0007] As an improvement of the piston pump with an open-first-close sealing structure of the present invention, a suction port is provided at the end of the piston cylinder housing, and a discharge port is provided on one side of the piston cylinder housing. The sealing assembly is initially in a state of sealing the suction port. When the sealing assembly is driven by the driving member to open the suction port, the discharge port is in a closed state.

[0008] As an improvement of the piston pump with an open-first-close sealing structure of the present invention, when the driving member drives the sealing assembly to start moving away from the suction port, the piston assembly remains in place, the suction port is opened, and the discharge port is closed.

[0009] As an improvement of the piston pump with an open-first-close sealing structure of the present invention, when the driving member drives the sealing assembly to move to the extreme position, the driving member disengages from the sealing assembly, the driving member continues to move downward, and drives the piston assembly to move together, the suction port and the cavity are connected, and the cavity is in an air intake state.

[0010] As an improvement of the piston pump with an open-first-close sealing structure of the present invention, the driving member moves upward and drives the sealing assembly to move upward together until the suction port is sealed, the suction port is closed, the discharge port is opened, the driving member continues to move upward and drives the piston assembly to move upward, and the cavity is in an exhaust state.

[0011] As an improvement of the piston pump with a first-open-first-close sealing structure of the present invention, the sealing assembly includes a sealing rod, one end of the sealing rod is provided with a first sealing block and a second sealing block at intervals, and the other end of the sealing rod is provided with two clamping positions at intervals, when the sealing assembly is in an initial state, the driving member is connected to the first clamping position through an elastic ring or an elastic component, when the driving member drives the sealing assembly to move to the extreme position, the driving member is disconnected from the first clamping position, and when the driving member drives the piston assembly to continue to move, the driving member drives the elastic ring or the elastic component to slide to the second clamping position;

[0012] During the process of air intake at the suction port, the second sealing block seals the discharge port, and during the process of air exhaust at the discharge port, the first sealing block seals the suction port.

[0013] As an improvement of the piston pump with a first-open, first-close sealing structure of the present invention, the piston assembly includes a piston rod, a piston is sleeved on the upper end of the piston rod, a limiting groove is provided at the lower end of the piston rod, and the driving member can move up and down in the limiting groove, the lower end of the sealing rod is penetrated on the piston rod and the driving member, the lower end of the piston rod is penetrated on the driving member, and the upper part of the driving member is provided with a accommodating groove matching the limiting groove.

[0014] As an improvement of the piston pump with an open-first-close sealing structure of the present invention, a partition is also provided in the cavity, the upper end of the sealing rod is passed through the partition, the partition is located between the first sealing block and the second sealing block, a stopper is provided at one end of the partition, the stopper and the side wall of the cavity form an air intake channel, the partition separates the cavity to form an air intake chamber and an air collecting chamber, and the air intake chamber and the air collecting chamber are connected through the channel.

[0015] As an improvement of the piston pump with an open-first-close sealing structure of the present invention, when the driving member drives the sealing assembly to move downward to the extreme position, the first sealing block abuts against the partition to limit the movement of the entire sealing assembly. When the driving member continues to move downward, it drives the piston assembly to move downward, and the elastic ring is deformed by pressure and slides with the driving member to the second locking position.

[0016] As an improvement of the piston pump with an open-first-close sealing structure of the present invention, the discharge port is always kept closed during the suction process of the suction port, and the suction port is always kept closed during the exhaust process of the discharge port.

[0017] As an improvement of the piston pump with a first-open-first-close sealing structure of the present invention, a through groove for the sealing rod to pass through is provided in the middle of the driving member, and spring grooves are symmetrically provided on the two side walls of the through groove. The elastic component includes a spring arranged in the spring groove, and a ball is provided at the end of the spring. When the sealing rod brought by the driving member moves, the ball first docks with the first position, and when the first sealing block abuts against the partition, the movement of the entire sealing assembly is restricted. When the driving member continues to move downward, the spring is squeezed by the ball, and the ball is disconnected from the first position. After the ball is disconnected from the first position, the driving member drives the piston assembly to continue to move downward. When the ball reaches the position of the second position, it forms a limiting effect with the second position, and the piston at this time also reaches the limit position of downward movement.

[0018] Compared with the prior art, the advantages of the present invention are: the present invention overcomes the problem that the deformation of the one-way valve made of elastic material has obvious hysteresis, so that before the piston pump performs the suction operation, the suction port is already in an open state and the discharge port is already in a closed state; before the piston pump performs the exhaust operation, the suction port is already in a closed state and the discharge port is already in an open state. The efficiency loss of the piston pump caused by the hysteresis problem of the one-way valve is reduced or even eliminated, so that the piston pump can operate at a higher rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention and its beneficial technical effects are further described in detail below based on the accompanying drawings and specific embodiments, wherein:

[0020] Figure 1 It is a schematic diagram of the overall explosion structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the structure of the piston cylinder housing of the present invention.

[0022] Figure 3 It is a schematic diagram of the structure of the sealing component of the present invention.

[0023] Figure 4 It is a schematic diagram of the structure of the piston assembly of the present invention.

[0024] Figure 5 It is a schematic structural diagram of the first embodiment of the driving member of the present invention.

[0025] Figure 6 It is a diagram of the initial state of the piston pump of the present invention.

[0026] Figure 7 This is a state diagram of the piston pump of the present invention when it starts to suck in the medium.

[0027] Figure 8 This is a state diagram of the piston pump of the present invention completing the medium suction.

[0028] Fig. 9 This is a state diagram of the piston pump of the present invention starting to discharge the medium.

[0029] Fig.10 It is a schematic structural diagram of the second embodiment of the driving member of the present invention.

[0030] Fig.11 It is a schematic structural diagram of the second embodiment of the present invention.

[0031] Reference numerals:

[0032] 1. Piston cylinder housing;

[0033] 2. Cavity; 21. baffle 22. stopper 23. channel 24. middle hole;

[0034] 3. Sealing assembly; 31. Sealing rod 32. First sealing block 33. Second sealing block 34. First clamping position 35. Second clamping position;

[0035] 4. Piston assembly; 41. Piston rod 42. Piston 43. Limiting groove 44. Through hole;

[0036] 5. Driving member; 51. Accommodating groove 52. Penetrating groove 53. Annular groove 54. Upper end limiting portion 55. Spring groove;

[0037] 6. Suction port;

[0038] 7. Exhaust port;

[0039] 8. Elastic ring;

[0040] 9. Elastic component; 91. Spring 92. Sphere. DETAILED DESCRIPTION

[0041] The present invention will be further described below based on the accompanying drawings and specific embodiments, but the embodiments of the present invention are not limited thereto.

[0042] like Figures 1 to 9 As shown, a piston pump with an open-first-close sealing structure comprises a piston cylinder housing 1, a cavity is provided in the piston cylinder housing 1, a sealing assembly 3 and a piston assembly 4 are penetrated in the cavity 2, and a driving member 5 is further provided in the cavity 2, and the driving member 5 can first drive the sealing assembly 3 to move to the extreme position and then drive the piston assembly 4 to move;

[0043] The process of the sealing assembly 3 and the piston assembly 4 moving downward is the air intake process of the cavity 2, and the process of the sealing assembly 3 and the piston assembly 4 moving upward is the air exhaust process of the cavity 2.

[0044] Preferably, a suction port 6 is provided at the end of the piston cylinder housing 1, and a discharge port 7 is provided on one side of the piston cylinder housing 1. The sealing assembly 3 is initially in a state of sealing the suction port 6. When the sealing assembly 3 is driven by the driving member 5 to open the suction port 6, the discharge port 7 is in a closed state.

[0045] The driving member 5 is a connecting component between an external power device (not marked in the figure) that generates linear reciprocating motion and a piston pump, and its function is to transmit the external linear reciprocating motion to the piston through the piston rod.

[0046] Preferably, when the driving member 5 drives the sealing assembly 3 to start moving away from the suction port 6, the piston assembly 4 remains in place, the suction port 6 is opened, and the discharge port 7 is closed.

[0047] Preferably, when the driving member 5 drives the sealing assembly 3 to move to the extreme position, the driving member 5 disengages from the sealing assembly 3, the driving member 5 continues to move downward and drives the piston assembly 4 to move together, the suction port 6 is connected to the cavity 2, and the cavity 2 is in an air intake state.

[0048] Preferably, the driving member 5 moves upward and drives the sealing assembly 3 to move upward together until the suction port 6 is sealed, the suction port 6 is closed, and the discharge port 7 is opened. The driving member 5 continues to move upward and drives the piston assembly 4 to move upward, and the cavity 2 is in the exhaust state.

[0049] Preferably, the sealing assembly 3 includes a sealing rod 31, one end of the sealing rod 31 is provided with a first sealing block 32 and a second sealing block 33, and the other end of the sealing rod 31 is provided with two clamping positions, when the sealing assembly 3 is in an initial state, the driving member 5 is connected to the first clamping position 34 through the elastic ring 8 or the elastic assembly 9, when the driving member 5 drives the sealing assembly 3 to move to the extreme position, the driving member 5 is disconnected from the first clamping position 34, and when the driving member 5 drives the piston assembly 4 to continue to move, the driving member 5 drives the elastic ring 8 or the elastic assembly 9 to slide to the second clamping position 35;

[0050] During the process of air intake at the suction port 6 , the second sealing block 33 seals the discharge port 7 , and during the process of air discharge at the discharge port 7 , the first sealing block 32 seals the suction port 6 .

[0051] Preferably, the piston assembly 4 includes a piston rod 41, the upper end of the piston rod 41 is sleeved with a piston 42, the lower end of the piston rod 41 is provided with a limiting groove 43, the driving member 5 can move up and down in the limiting groove 43, the lower end of the sealing rod 31 is penetrated on the piston rod 41 and the driving member 5, the lower end of the piston rod 41 is penetrated on the driving member 5, and the upper part of the driving member 5 is provided with a receiving groove 51 that matches the limiting groove 43. A through hole 44 is provided in the center of the piston rod 41 for installing the sealing rod 31, and the sealing rod 31 can move relatively in the through hole 44.

[0052] Preferably, a partition 21 is further provided in the cavity 2, the upper end of the sealing rod 31 is passed through the partition 21, the partition 21 is located between the first sealing block 32 and the second sealing block 33, a stopper 22 is provided at one end of the partition 21, the stopper 22 and the side wall of the cavity 2 form an air intake channel 23, the partition 21 separates the cavity 2 to form an air intake cavity and an air collecting cavity, and the air intake cavity and the air collecting cavity are connected through the channel 23. A middle hole 24 is provided in the middle of the partition 21, the middle hole 24 is for the sealing rod 31 to pass through, and the sealing rod 31 can move up and down relatively on the middle hole 24.

[0053] Preferably, when the driving member 5 drives the sealing assembly 3 to move downward to the extreme position, the first sealing block 32 presses against the partition 21 to limit the movement of the entire sealing assembly 3. When the driving member 5 continues to move downward, it drives the piston assembly 4 to move downward, and the elastic ring 8 is deformed by the pressure and slides with the driving member 5 to the second locking position 35.

[0054] A through groove 52 for the sealing rod 31 to pass through is provided in the middle of the driving member 5 , and an annular groove 53 for cooperating with the elastic ring 8 to fix the through groove 52 is provided on the side wall thereof, and an upper end limit portion 54 is provided at the opening position of the accommodating groove 51 .

[0055] Preferably, during the process of air intake at the suction port 6, the exhaust port 7 is always kept in a closed state, and during the process of air exhaust at the exhaust port 7, the suction port 6 is always kept in a closed state.

[0056] Embodiment 2: Fig.10 and Fig.11 As shown, the difference of this embodiment is that an elastic component 9 is arranged on the driving member, and its suction and exhaust process is the same as that of the first embodiment. Specifically, a through groove 52 for the sealing rod 31 to penetrate is arranged in the middle of the driving member 5, and spring grooves 55 are symmetrically arranged on the two side walls of the through groove 52. The elastic component 9 includes a spring 91 arranged in the spring groove 55, and a ball 92 is arranged at the end of the spring 91. When the sealing rod 31 brought by the driving member 5 moves, the ball 92 first docks with the first clamping position 34. When the first sealing block 32 abuts against the partition 21, the movement of the entire sealing component 3 is limited. When the driving member 5 continues to move downward, the spring 91 is squeezed by the ball 92, and the ball 92 is disconnected from the first clamping position 34. After the ball 92 is disconnected from the first clamping position 34, the driving member 5 drives the piston assembly 4 to continue to move downward. When the ball 92 reaches the position of the second clamping position 35, it forms a limiting effect with the second clamping position 35, and the piston at this time also reaches the limit position of downward movement.

[0057] The present invention has the following three states:

[0058] (1) Initial state: the first sealing block 32 blocks the suction port 6; the limiting groove 43 of the piston rod 41 fits with the lower limiting portion of the accommodating groove 51 of the driving member 5; the elastic ring 8 in the driving member 5 is snapped into the first snapping position 34 of the sealing rod 31.

[0059] (2) Inhalation state: When the driving member 5 moves linearly downward under the action of the external linear reciprocating power device, the elastic ring 8 is engaged in the first engagement position 34 of the sealing rod 31, so the driving member 5 can drive the sealing assembly 3 to move linearly downward, and the piston assembly 4 remains stationary at this time; when the first sealing block 32 is in contact with the partition 21 on the side of the suction port 6, the first sealing block 32 is restricted from continuing to move backward, and the suction port 6 is opened, while the discharge port 7 is blocked by the second sealing block 33; under the action of the external linear reciprocating power device, the driving member 5 continues to move linearly downward, and the elastic ring 8 is squeezed and deformed, thereby leaving the first engagement position 34; when the upper end limit portion in the accommodating groove 51 of the driving member 5 is in contact with the lower end limit portion of the piston rod 41, the driving member 5 drives the piston rod 41 to move linearly downward; at this time, the piston pump starts to inhale the medium from the suction port 6 and transmits it to the piston chamber through the connecting channel; the elastic ring 8 of the driving member 5 continues to move downward through the second engagement position 35.

[0060] (3) Exhaust state: When the driving member 5 reaches the maximum downward movement position under the action of the external linear reciprocating motion power device; the external linear reciprocating motion power device will immediately change to upward linear movement; when the elastic ring 8 of the driving member 5 is engaged in the second locking position 35, the driving member 5 drives the sealing assembly 3 to move upward linearly, and the piston rod 41 remains stationary at this time; when the first sealing block 32 blocks the suction port 6, the second sealing block 33 moves away from the discharge port 7, that is, the discharge port 7 is opened; at this time, the first sealing block 32 has reached the limited position and can no longer continue to move upward linearly. Under the action of the external linear reciprocating power device, the driving member 5 continues to move linearly upward, and the elastic ring 8 is squeezed and deformed, thereby disengaging from the second locking position 35; when the upper end limit portion in the accommodating groove 51 of the driving member 5 is in contact with the upper movement limit portion of the piston rod 41, the driving member 5 drives the piston rod 41 to move linearly upward; at this time, the piston pump starts to discharge the medium in the piston cavity from the discharge port 7; the driving member 5 continues to move linearly upward, and the elastic ring 8 is locked in the first locking position 34; at this time, the driving member 5 reaches the maximum position of the upward movement, and the inside of the piston pump returns to the initial state.

[0061] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and structure of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A piston pump with a first-open-first-close sealing structure, comprising a piston cylinder housing, a cavity is provided in the piston cylinder housing, a sealing assembly and a piston assembly are provided in the cavity, characterized in that: A driving member is also provided in the cavity, and the driving member can first drive the sealing assembly to move to the extreme position, and then drive the piston assembly to move; The process in which the sealing assembly and the piston assembly move downward is the air intake process of the cavity, and the process in which the sealing assembly and the piston assembly move upward is the air exhaust process of the cavity; The sealing assembly comprises a sealing rod, one end of which is provided with a first sealing block and a second sealing block, and the other end of which is provided with two locking positions, when the sealing assembly is in an initial state, the driving member is connected to the first locking position through an elastic member, when the driving member drives the sealing assembly to move to an extreme position, the driving member is disconnected from the first locking position, and when the driving member drives the piston assembly to continue to move, the driving member drives the elastic member to slide to the second locking position; The piston assembly comprises a piston rod, the upper end of the piston rod is sleeved with a piston, the lower end of the piston rod is provided with a limiting groove, the driving member can move up and down in the limiting groove, the lower end of the sealing rod is penetrated on the piston rod and the driving member, the lower end of the piston rod is penetrated on the driving member, and the upper part of the driving member is provided with a receiving groove matched with the limiting groove; A penetration groove for the sealing rod to penetrate is provided in the middle of the driving member, and spring grooves are symmetrically provided on both side walls of the penetration groove. The elastic component includes a spring arranged in the spring groove, and a ball is provided at the end of the spring.

2. The piston pump with a first-open-first-close sealing structure according to claim 1, characterized in that: The end of the piston cylinder housing is provided with a suction port, and one side of the piston cylinder housing is provided with a discharge port. The sealing component is initially in a state of sealing the suction port. When the sealing component is driven by the driving member to open the suction port, the discharge port is in a closed state.

3. The piston pump with a first-open-first-close sealing structure according to claim 2, characterized in that: When the driving member drives the sealing assembly to start moving away from the suction port, the piston assembly remains stationary, the suction port is opened, and the discharge port is closed.

4. The piston pump with a first-open-first-close sealing structure according to claim 3, characterized in that: When the driving member drives the sealing assembly to move to the extreme position, the driving member is disengaged from the sealing assembly, the driving member continues to move downward, and drives the piston assembly to move together, the suction port is connected with the cavity, and the cavity is in an air suction state; The driving member moves upward and drives the sealing assembly upward together until the suction port is sealed, the suction port is closed, and the discharge port is opened. The driving member continues to move upward and drives the piston assembly upward, and the cavity is in an exhaust state.

5. The piston pump with a first-open-first-close sealing structure according to claim 4, characterized in that: During the process of air intake at the suction port, the second sealing block seals the discharge port, and during the process of air exhaust at the discharge port, the first sealing block seals the suction port.

6. The piston pump with a first-open-first-close sealing structure according to claim 4, characterized in that: A partition is also provided in the cavity, and the upper end of the sealing rod is passed through the partition. The partition is located between the first sealing block and the second sealing block. A stopper is provided at one end of the partition, and the stopper and the side wall of the cavity form an air intake channel. The partition separates the cavity to form an air intake chamber and an air collecting chamber, and the air intake chamber and the air collecting chamber are connected through the channel.

7. The piston pump with a first-open-first-close sealing structure according to claim 6, characterized in that: When the driving member drives the sealing assembly to move downward to the extreme position, the first sealing block presses against the partition to limit the movement of the entire sealing assembly. When the driving member continues to move downward, it drives the piston assembly to move downward. The elastic assembly is deformed by the pressure and slides with the driving member to the second locking position.

8. The piston pump with a first-open-first-close sealing structure according to claim 2, characterized in that: During the process of air intake by the suction port, the discharge port is always kept in a closed state, and during the process of air exhaust by the discharge port, the suction port is always kept in a closed state.

Images