Double-compression pump body structure and compression method

Abstract

The invention belongs to a double-compression pump body structure and a compression method. Comprising a cylinder body and a cylinder base, the cylinder body and the cylinder base form a cavity structure of the compression pump body, a piston rod matched with the cavity structure is arranged at one end of the cylinder base, a to-be-compressed medium inlet is formed in the side, close to the cylinder base, of the cylinder body, and a compressed medium outlet is formed in the other side of the cylinder body. The to-be-compressed medium inlet is communicated with a first compression cavity in the cavity structure, the compressed medium outlet is communicated with a second compression cavity in the cavity structure, and the first compression cavity and the second compression cavity are communicated through a piston rod channel in the piston rod; the device has the characteristics that the design is reasonable, and the compression load in the original compression process is reduced through secondary compression of the to-be-compressed medium, so that the purposes of saving energy, reducing consumption and improving the compression efficiency are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of medium compression pumps, and in particular relates to a double-compression pump body structure and a compression method. Background Art

[0002] The compression pump is an important industrial equipment, and its main function is to increase the low-pressure fluid to a high-pressure fluid through a certain mechanical action. Among them, the piston compression with reciprocating action is a common compression pump equipment; this type of equipment drives the piston rod to reciprocate with power, and in the process of reciprocating motion, it enters the fluid medium, compresses it and outputs the pressurized fluid medium; the above process has the characteristics of simple structure and convenience and practicality; but in the actual process, there are defects such as high energy consumption and low compression efficiency. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects in the prior art and provide a double compression pump body structure and a compression method.

[0004] The above technical objectives of the present invention are achieved through the following technical solutions:

[0005] A double compression pump body structure includes a cylinder body and a cylinder seat, the cylinder body and the cylinder seat constitute a cavity structure of the compression pump body, one end of the cylinder seat is provided with a piston rod adapted to the aforementioned cavity structure, a side of the cylinder body close to the cylinder seat is provided with an inlet for a medium to be compressed, and the other side of the cylinder body is provided with an outlet for a compressed medium, the inlet for the medium to be compressed is connected to a first compression chamber inside the cavity structure, the outlet for the compressed medium is connected to a second compression chamber inside the cavity structure, and the first compression chamber and the second compression chamber are connected through a piston rod channel inside the piston rod.

[0006] The beneficial effects of the present invention are as follows: by providing a first compression chamber connected to the inlet of the medium to be compressed, and a second compression chamber connected to the outlet of the compressed medium, the characteristic of realizing secondary compression of the fluid medium in the present invention can be achieved, and the secondary compression is realized under the normal operating state of the compression pump, thereby achieving the characteristics of energy saving and consumption reduction and improving compression efficiency.

[0007] Preferably, a liquid inlet sealing portion is sleeved on the piston rod corresponding to the first compression chamber, and the liquid inlet sealing portion includes a baffle plate and a shift fork fixedly sleeved on the piston rod, and a movably arranged floating piston is provided between the baffle plate and the shift fork; a piston liquid inlet is provided in the middle of the floating piston, and a shift fork liquid inlet is provided at a position corresponding to the piston liquid inlet and the shift fork.

[0008] Preferably, a pressure protection part is also provided on the liquid inlet sealing part, and the pressure protection part includes a spring seat fixedly mounted on the piston rod, a pressure protection spring is arranged in the spring seat, the end of the pressure protection spring contacts the surface of the baffle plate through a protection pressure cover, and a pressure relief port is opened at the position corresponding to the baffle plate and the protection pressure cover.

[0009] Preferably, a first retaining spring is provided on the outer side of the spring seat, and a second retaining spring is provided on the outer side of the shift fork.

[0010] Preferably, the piston rod channel includes a piston rod front channel and a piston rod rear channel, a connecting liquid inlet is provided between the piston rod front channel and the piston rod rear channel, a pressure cap is provided at the end of the piston rod, a valve core guide seat extending into the piston rod rear channel is provided on the pressure cap, a valve core spring is provided inside the valve core guide seat, a valve core adapted to the connecting liquid inlet is provided at the end of the valve core spring; a guide seat opening connecting the piston rod rear channel and the second compression chamber is provided in the middle of the valve core guide seat.

[0011] Preferably, a one-way valve is provided on the compressed medium outlet, and the one-way valve comprises a medium outlet spring and a medium outlet valve core matched with the medium outlet spring.

[0012] Preferably, a sealing filler is provided on one side of the piston rod corresponding to the cylinder seat, and a piston ring is provided on the piston rod corresponding to the cylinder body.

[0013] The present invention also provides a compression method for a dual-compression pump body structure, the compression method comprising: when the piston rod moves toward the second compression chamber, the medium to be compressed enters the first compression chamber in the chamber structure through the medium to be compressed inlet, and at the same time, the medium to be compressed is secondary compressed in the second compression chamber, and after the secondary compression, the compressed medium is discharged through the compression medium outlet; when the medium to be compressed completely enters the first compression chamber, when the piston rod moves in the opposite direction, pre-compression is performed in the first compression chamber, and after the pre-compression is completed, the compressed medium piston rod channel enters the second compression chamber.

[0014] A compression method of a double compression pump body structure, the compression method comprising the following steps:

[0015] Step 1: When the piston rod moves from the first compression chamber to the second compression chamber,

[0016] The corresponding baffle plate and the shift fork in the first compression chamber both move toward the direction of the second compression chamber, and at this time, the shift fork drives the floating piston to move toward the direction of the second compression chamber, the piston liquid inlet and the shift fork liquid inlet are in an open state, and the medium to be compressed in the medium to be compressed inlet enters the first compression chamber;

[0017] At the same time, the pressure cap performs secondary compression on the medium to be compressed in the second compression chamber. During the compression process, the medium to be compressed exerts force on the valve core, causing the valve core to block the liquid inlet. Further, when the pressure of the medium to be compressed reaches a preset threshold, the valve core at the outlet of the compressed medium exerts force to open the one-way valve, completing the external discharge of the compressed medium after secondary compression.

[0018] Step 2: When the piston rod moves from the second compression chamber to the first compression chamber,

[0019] The corresponding baffle plate and shift fork in the first compression chamber both move toward the cylinder seat. At this time, the baffle plate drives the floating piston to move toward the cylinder seat. The inner surface of the baffle plate blocks the piston liquid inlet, so that a closed cavity is formed between the first compression chamber and the rear channel of the piston rod, and the pre-compression of the medium to be compressed is gradually realized; further, as the pressure of the pre-compressed medium to be compressed gradually increases, the force of the medium to be compressed acts on the valve core, so that the valve core overcomes the pressure of the valve core spring and moves toward the second compression chamber, and finally the compressed medium in the aforementioned closed cavity enters the second compression chamber through the connecting liquid inlet, the rear channel of the piston rod and the opening of the guide seat; the volume in the second compression chamber gradually increases during the aforementioned process.

[0020] Preferably, when the pre-compressed compressed medium in the first compression chamber in step 2 exceeds a preset threshold value, the compressed medium deforms the pressure protection spring through the pressure relief port and pushes the protective cover to move toward the second compression chamber, so that the compressed medium in the first compression chamber is released from the pressure relief port and through the gap generated between the baffle plate and the protective cover; when the pressure relief is completed, the pressure protection spring resets and drives the protective cover to continue to apply pressure to the surface of the baffle plate.

[0021] A double compression pump body structure and compression method made according to the above technical solution can realize the first compression (or pre-compression) of the medium to be compressed by setting a first compression chamber connected to the inlet of the medium to be compressed, and can realize the second compression of the medium after the first compression by setting a second compression chamber connected to the outlet of the compressed medium. The above two compression chambers are connected through the piston rod channel inside the piston rod, thereby realizing the characteristic of realizing double compression without changing the working mode of the compression pump, wherein the liquid inlet sealing part can realize the medium to be compressed entering the first compression chamber, and can realize the characteristic of sealing when compressing in the first compression chamber to ensure the pre-compression effect; by setting the connecting liquid inlet and the auxiliary components, it can be realized in the first The compression chamber and the second compression chamber are sealed during compression, and at the same time, when the compressed medium in the first compression chamber is at a certain threshold after compression, the first compression chamber is opened to enable the compressed medium in the first compression chamber to enter the second compression chamber. The present invention is based on the working process of the existing reciprocating compression pump to achieve that during the compression of the second compression chamber, the first compression chamber is in a state of entering the medium to be compressed, and when the medium to be compressed completely enters the first compression chamber, the piston rod moves in the opposite direction, and pre-compression is performed in the first compression chamber. After the pre-compression is completed, the compressed medium piston rod channel enters the second compression chamber. The invention has the characteristics of reasonable design, and the compression load in the original compression process is reduced by secondary compression of the medium to be compressed, thereby achieving energy saving and consumption reduction and improving compression efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 This is a schematic diagram of the first compression chamber of the present invention when entering the medium to be compressed.

[0024] Figure 2 This is a schematic diagram of the compressed medium entering the second compression chamber of the present invention.

[0025] Figure 3 It is a schematic structural diagram of the shift fork of the present invention.

[0026] In the above picture:

[0027] 1. Cylinder body; 2. Cylinder seat; 3. Piston rod; 4. Inlet of medium to be compressed; 5. Outlet of compressed medium; 6. Baffle plate; 7. Shift fork; 8. Floating piston; 9. Piston liquid inlet; 10. Piston ring; 11. Shift fork liquid inlet; 12. Spring seat; 13. Pressure protection spring; 14. Protection gland; 15. First retaining spring; 16. Second retaining spring; 17. Piston rod front channel; 18. Piston rod rear channel; 19. Pressure relief port; 20. Connecting liquid inlet; 21. Pressure cap; 22. Valve core guide seat; 23. Valve core spring; 24. Valve core; 25. Guide seat opening; 26. Medium outlet spring; 27. Medium outlet valve core. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Reference Figure 1-3 The present invention is a dual compression pump body structure and a compression method, which structure includes a cylinder body 1 and a cylinder base 2, the cylinder body 1 and the cylinder base 2 constitute a cavity structure of the compression pump body, one end of the cylinder base 2 is provided with a piston rod 3 adapted to the aforementioned cavity structure, a side of the cylinder body 1 close to the cylinder base 2 is provided with an inlet 4 for a medium to be compressed, and the other side of the cylinder body 1 is provided with a compressed medium outlet 5, the inlet 4 for the medium to be compressed is connected to a first compression chamber inside the cavity structure, the compressed medium outlet 4 is connected to a second compression chamber inside the cavity structure, and the first compression chamber and the second compression chamber are connected through a piston rod channel inside the piston rod 3. The present invention is suitable for the compression of gas and liquid, and is particularly suitable for the compression of deep-cold liquid-phase gas. Compared with the primary compression in the traditional technology, the present invention can reduce the workload of the traditional primary compression through pre-compression (primary compression) and secondary compression, so as to achieve the characteristics of reducing energy consumption and improving compression efficiency. The present invention realizes pre-compression through the first compression chamber, and the pre-compressed medium enters the second compression chamber through the piston rod channel to realize secondary compression. It should be noted that the working process of the present invention is the same as the working process of the traditional compression pump, and the piston rod 3 can not only achieve the purpose of pre-compression and secondary compression, but also realize the circulation of the medium, thereby achieving the characteristics of simple structure and reasonable design.

[0030] Furthermore, a liquid inlet sealing part is sleeved on the piston rod 3 corresponding to the first compression chamber, and the liquid inlet sealing part includes a baffle 6 and a shift fork 7 fixedly sleeved on the piston rod 3, and a floating piston 8 is movably arranged between the baffle 6 and the shift fork 7; a piston liquid inlet 9 is arranged in the middle of the floating piston 8, and a shift fork liquid inlet 11 is arranged at a position corresponding to the piston liquid inlet 9 and the shift fork 7. The floating piston 8 described in the present invention is movably arranged on the piston rod 3, and is driven to move by the baffle 6 or the shift fork 7 as the piston rod 3 moves. When the shift fork 7 drives the floating piston 8, the purpose of entering the medium to be compressed can be achieved, and when the piston rod 3 floats the piston 8, the first compression chamber can be sealed; the above arrangement can achieve the characteristics of entering the medium to be compressed or pre-compressing the medium to be compressed in different states.

[0031] Furthermore, a pressure protection member is provided on the liquid inlet sealing portion, and the pressure protection member includes a spring seat 12 fixedly sleeved on the piston rod 3, a pressure protection spring 13 is provided in the spring seat 12, the end of the pressure protection spring 13 contacts the surface of the baffle 6 through a protection gland 14, and a pressure relief port 19 is provided at a position corresponding to the baffle 6 and the protection gland 14. The above arrangement can realize pressure relief when the pressure of the medium to be compressed is too high during the pre-compression process, so as to avoid affecting the normal operation of the entire device.

[0032] Furthermore, a first clamping spring 15 is disposed on the outer side of the spring seat 12, and a second clamping spring 16 is disposed on the outer side of the shift fork 7. By the above arrangement, the first clamping spring 15 and the second clamping spring 16 can be arranged, and the spring seat 12 and the shift fork 7 can be fixed.

[0033] Furthermore, the piston rod channel includes a piston rod front channel 17 and a piston rod rear channel 18, a connecting liquid inlet 20 is provided between the piston rod front channel 17 and the piston rod rear channel 18, a pressure cap 21 is provided at the end of the piston rod 3, a valve core guide seat 22 extending into the piston rod rear channel 18 is provided on the pressure cap 21, a valve core spring 23 is provided inside the valve core guide seat 22, and a valve core 24 adapted to the connecting liquid inlet 20 is provided at the end of the valve core spring 23; a guide seat opening 25 connecting the piston rod rear channel 18 and the second compression chamber is provided in the middle of the valve core guide seat 22. The present invention realizes the connection between the first compression chamber and the second compression chamber by setting the connecting liquid inlet 20, realizes the purpose of entering the second compression chamber when the pressure of the first compression chamber is too large by the cooperation of the valve core spring 23 and the valve core 24, and avoids the characteristic that the compressed medium of the second compression chamber returns to the first compression chamber.

[0034] Furthermore, a one-way valve is provided on the compressed medium outlet 5 , and the one-way valve includes a medium outlet spring 26 and a medium outlet valve core 27 matched with the medium outlet spring 26 .

[0035] Furthermore, a sealing packing 1 is provided on one side of the piston rod 3 corresponding to the cylinder base 2, and a piston ring 10 is provided on the piston rod 3 corresponding to the cylinder body 1.

[0036] The present invention also provides a compression method for a dual-compression pump body structure, the compression method comprising: when the piston rod 3 moves toward the second compression chamber, the medium to be compressed enters the first compression chamber in the chamber structure through the medium to be compressed inlet 4, and at the same time, the medium to be compressed is secondary compressed in the second compression chamber, and after the secondary compression, the compressed medium is discharged through the compression medium outlet 5; when the medium to be compressed completely enters the first compression chamber, when the piston rod 3 is moved in the opposite direction, pre-compression is performed in the first compression chamber, and after the pre-compression is completed, the compressed medium piston rod channel enters the second compression chamber.

[0037] The present invention also provides a compression method of a double compression pump body structure, the compression method comprising the following steps:

[0038] Step 1: When the piston rod 3 moves from the first compression chamber to the second compression chamber,

[0039] The corresponding baffle plate 6 and fork 7 in the first compression chamber both move toward the direction of the second compression chamber, and at this time, the fork 7 drives the floating piston 8 to move toward the direction of the second compression chamber, the piston liquid inlet 9 and the fork liquid inlet 11 are in an open state, and the medium to be compressed in the medium to be compressed inlet 4 enters the first compression chamber;

[0040] At the same time, the pressure cap 21 performs secondary compression on the medium to be compressed in the second compression chamber. During the compression process, the medium to be compressed exerts force on the valve core 24, so that the valve core 24 blocks the liquid inlet 20; further, when the pressure of the medium to be compressed reaches a preset threshold, the medium outlet valve core 27 exerts force to realize the opening of the one-way valve, completing the discharge of the compressed medium after secondary compression;

[0041] Step 2: When the piston rod 3 moves from the second compression chamber to the first compression chamber,

[0042] The corresponding baffle plate 6 and shift fork 7 in the first compression chamber both move toward the cylinder base 2. At this time, the baffle plate 6 drives the floating piston 8 to move toward the cylinder base 2. The inner surface of the baffle plate 6 blocks the piston liquid inlet 9, so that a closed cavity is formed between the first compression chamber and the piston rod rear channel 18, and the pre-compression of the medium to be compressed is gradually realized; further, as the pressure of the pre-compressed medium to be compressed gradually increases, the force of the medium to be compressed acts on the valve core 24, so that the valve core 24 overcomes the pressure of the valve core spring 23 and moves toward the second compression chamber, and finally the compressed medium in the aforementioned closed cavity enters the second compression chamber through the connecting liquid inlet 20, the piston rod rear channel 18 and the guide seat opening 25; the volume in the second compression chamber gradually increases during the aforementioned process.

[0043] Furthermore, when the pre-compressed compressed medium in the first compression chamber in the step 2 exceeds a preset threshold value, the compressed medium deforms the pressure protection spring 13 through the pressure relief port 19 and pushes the protective pressure cover 14 to move toward the second compression chamber, so that the compressed medium in the first compression chamber is released from the pressure relief port 19 and through the gap generated between the baffle plate 6 and the protective pressure cover 14; when the pressure relief is completed, the pressure protection spring 13 resets and drives the protective pressure cover 14 to continue to apply pressure to the surface of the baffle plate 6.

[0044] The difference between the technical solution of the present invention and the ordinary plunger liquid pump is that there is no liquid inlet valve, and the position of the floating piston 8 is different, so as to achieve the liquid inlet and compression and discharge of the first compression chamber (pre-compression chamber); the first compression chamber is cleverly set in the middle of the piston rod 3, so that the direction of the first compression is opposite to the direction of the second compression. This technical solution is different from the traditional liquid pump that can only compress once in one reciprocating action. It realizes that one reciprocating action can complete two compression processes of primary compression and secondary compression, that is, two-stage compression; under the condition of constant inlet and outlet pressure and constant compression ratio, it can effectively reduce the compression ratio of the single stage, thereby reducing its compression process work and shaft power. It can also be considered that the first compression process utilizes the work of the return stroke of the piston rod 3; at the same time, it can also be analogous to the double-acting cylinder of the piston compressor, which has higher efficiency. By comparison, the shaft power of this structure will be reduced by 5% to 10% compared with the ordinary plunger liquid pump. In addition, due to the limitation of structural strength, the pre-compression pressure cannot be too high, so an overpressure relief device is set, which avoids the problem of safe operation of overpressure and enables the first compression chamber to play a key pre-compression role. The present invention is particularly suitable for the compression of cryogenic liquids. Specifically, because cryogenic liquids are easy to vaporize during the compression process, the compression efficiency is affected, and then the compression process of the pump body is affected. The pre-compression in the present invention can effectively reduce the vaporization of liquid during the secondary compression process. Because the pre-compression increases the pressure of the cryogenic liquid, the saturation temperature point of the cryogenic liquid will also increase, which makes it less likely to vaporize. It can also be considered to ensure that the liquid entering the final compression is in a supercooled state. The inlet cavitation margin NPSH of a conventional cryogenic liquid pump is about 1m, while the inlet cavitation margin NPSH of a cryogenic liquid pump of this structure can be reduced to 0.5m or even lower. It is because of the pre-compression process that the liquid intake of the secondary compression can be ensured; it has the advantage of improving the compression efficiency.

[0045] Example 1

[0046] A double compression pump body structure includes a cylinder body 1 and a cylinder base 2, the cylinder body 1 and the cylinder base 2 constitute a cavity structure of the compression pump body, one end of the cylinder base 2 is provided with a piston rod 3 adapted to the aforementioned cavity structure, a side of the cylinder body 1 close to the cylinder base 2 is provided with an inlet 4 for a medium to be compressed, and the other side of the cylinder body 1 is provided with a compressed medium outlet 5, the inlet 4 for the medium to be compressed is connected to a first compression chamber inside the cavity structure, the compressed medium outlet 4 is connected to a second compression chamber inside the cavity structure, and the first compression chamber and the second compression chamber are connected through a piston rod channel inside the piston rod 3.

[0047] A compression method for a dual-compression pump body structure, the compression method includes: when the piston rod 3 moves toward the second compression chamber, the medium to be compressed enters the first compression chamber in the chamber structure through the medium to be compressed inlet 4, and at the same time, the medium to be compressed is secondary compressed in the second compression chamber, and the compressed medium is discharged through the compression medium outlet 5 after the secondary compression; when the medium to be compressed completely enters the first compression chamber, when the piston rod 3 is moved in the opposite direction, the first compression chamber is pre-compressed, and when the pre-compression is completed, the compressed medium piston rod channel enters the second compression chamber.

[0048] Example 2

[0049] A double compression pump body structure includes a cylinder body 1 and a cylinder seat 2, the cylinder body 1 and the cylinder seat 2 form a cavity structure of the compression pump body, one end of the cylinder seat 2 is provided with a piston rod 3 adapted to the aforementioned cavity structure, a side of the cylinder body 1 close to the cylinder seat 2 is provided with an inlet 4 for a medium to be compressed, and the other side of the cylinder body 1 is provided with a compressed medium outlet 5, the inlet 4 for the medium to be compressed is connected to a first compression cavity inside the cavity structure, the compressed medium outlet 4 is connected to a second compression cavity inside the cavity structure, and the first compression cavity and the second compression cavity are connected through a piston rod channel inside the piston rod 3. A liquid inlet sealing part is sleeved on the piston rod 3 corresponding to the first compression cavity, the liquid inlet sealing part includes a baffle 6 and a shift fork 7 fixedly sleeved on the piston rod 3, and a floating piston 8 is movably arranged between the baffle 6 and the shift fork 7; a piston liquid inlet 9 is provided in the middle of the floating piston 8, and a shift fork liquid inlet 11 is provided at a position corresponding to the piston liquid inlet 9 and the shift fork 7. The piston rod channel includes a piston rod front channel 17 and a piston rod rear channel 18, and a connecting liquid inlet 20 is provided between the piston rod front channel 17 and the piston rod rear channel 18. A pressure cap 21 is provided at the end of the piston rod 3, and a valve core guide seat 22 extending into the piston rod rear channel 18 is provided on the pressure cap 21. A valve core spring 23 is provided inside the valve core guide seat 22, and a valve core 24 adapted to the connecting liquid inlet 20 is provided at the end of the valve core spring 23; a guide seat opening 25 connecting the piston rod rear channel 18 and the second compression chamber is provided in the middle of the valve core guide seat 22. A one-way valve is provided on the compressed medium outlet 5, and the one-way valve includes a medium outlet spring 26 and a medium outlet valve core 27 adapted to the medium outlet spring 26. A sealing packing 1 is provided on one side of the piston rod 3 corresponding to the cylinder seat 2, and a piston ring 10 is provided on the piston rod 3 corresponding to the cylinder body 1.

[0050] A compression method of a double compression pump body structure, the compression method comprising the following steps:

[0051] Step 1: When the piston rod 3 moves from the first compression chamber to the second compression chamber,

[0052] The corresponding baffle plate 6 and fork 7 in the first compression chamber both move toward the direction of the second compression chamber, and at this time, the fork 7 drives the floating piston 8 to move toward the direction of the second compression chamber, the piston liquid inlet 9 and the fork liquid inlet 11 are in an open state, and the medium to be compressed in the medium to be compressed inlet 4 enters the first compression chamber;

[0053] At the same time, the pressure cap 21 performs secondary compression on the medium to be compressed in the second compression chamber. During the compression process, the medium to be compressed exerts force on the valve core 24, so that the valve core 24 blocks the liquid inlet 20; further, when the pressure of the medium to be compressed reaches a preset threshold, the medium outlet valve core 27 exerts force to realize the opening of the one-way valve, completing the discharge of the compressed medium after secondary compression;

[0054] Step 2: When the piston rod 3 moves from the second compression chamber to the first compression chamber,

[0055] The corresponding baffle plate 6 and shift fork 7 in the first compression chamber both move toward the cylinder base 2. At this time, the baffle plate 6 drives the floating piston 8 to move toward the cylinder base 2. The inner surface of the baffle plate 6 blocks the piston liquid inlet 9, so that a closed cavity is formed between the first compression chamber and the piston rod rear channel 18, and the pre-compression of the medium to be compressed is gradually realized; further, as the pressure of the pre-compressed medium to be compressed gradually increases, the force of the medium to be compressed acts on the valve core 24, so that the valve core 24 overcomes the pressure of the valve core spring 23 and moves toward the second compression chamber, and finally the compressed medium in the aforementioned closed cavity enters the second compression chamber through the connecting liquid inlet 20, the piston rod rear channel 18 and the guide seat opening 25; the volume in the second compression chamber gradually increases during the aforementioned process.

[0056] Example 3

[0057] A double compression pump body structure includes a cylinder body 1 and a cylinder seat 2, the cylinder body 1 and the cylinder seat 2 form a cavity structure of the compression pump body, one end of the cylinder seat 2 is provided with a piston rod 3 adapted to the aforementioned cavity structure, a side of the cylinder body 1 close to the cylinder seat 2 is provided with an inlet 4 for a medium to be compressed, and the other side of the cylinder body 1 is provided with a compressed medium outlet 5, the inlet 4 for the medium to be compressed is connected to a first compression cavity inside the cavity structure, the compressed medium outlet 4 is connected to a second compression cavity inside the cavity structure, and the first compression cavity and the second compression cavity are connected through a piston rod channel inside the piston rod 3. A liquid inlet sealing part is sleeved on the piston rod 3 corresponding to the first compression cavity, the liquid inlet sealing part includes a baffle 6 and a shift fork 7 fixedly sleeved on the piston rod 3, and a floating piston 8 is movably arranged between the baffle 6 and the shift fork 7; a piston liquid inlet 9 is provided in the middle of the floating piston 8, and a shift fork liquid inlet 11 is provided at a position corresponding to the piston liquid inlet 9 and the shift fork 7. The liquid inlet sealing portion is also provided with a pressure protection member, which includes a spring seat 12 fixedly sleeved on the piston rod 3, a pressure protection spring 13 is provided in the spring seat 12, the end of the pressure protection spring 13 contacts the surface of the baffle 6 through a protection gland 14, and a pressure relief port 19 is provided at a position corresponding to the baffle 6 and the protection gland 14. A first retaining spring 15 is provided on the outer side of the spring seat 12, and a second retaining spring 16 is provided on the outer side of the shift fork 7. The piston rod channel includes a piston rod front channel 17 and a piston rod rear channel 18, and a connecting liquid inlet 20 is provided between the piston rod front channel 17 and the piston rod rear channel 18. A pressure cap 21 is provided at the end of the piston rod 3, and a valve core guide seat 22 extending into the piston rod rear channel 18 is provided on the pressure cap 21. A valve core spring 23 is provided inside the valve core guide seat 22, and a valve core 24 adapted to the connecting liquid inlet 20 is provided at the end of the valve core spring 23; a guide seat opening 25 connecting the piston rod rear channel 18 and the second compression chamber is provided in the middle of the valve core guide seat 22. A one-way valve is provided on the compressed medium outlet 5, and the one-way valve includes a medium outlet spring 26 and a medium outlet valve core 27 adapted to the medium outlet spring 26. A sealing packing 1 is provided on one side of the piston rod 3 corresponding to the cylinder seat 2, and a piston ring 10 is provided on the piston rod 3 corresponding to the cylinder body 1.

[0058] A compression method of a double compression pump body structure, the compression method comprising the following steps:

[0059] Step 1: When the piston rod 3 moves from the first compression chamber to the second compression chamber,

[0060] The corresponding baffle plate 6 and fork 7 in the first compression chamber both move toward the direction of the second compression chamber, and at this time, the fork 7 drives the floating piston 8 to move toward the direction of the second compression chamber, the piston liquid inlet 9 and the fork liquid inlet 11 are in an open state, and the medium to be compressed in the medium to be compressed inlet 4 enters the first compression chamber;

[0061] At the same time, the pressure cap 21 performs secondary compression on the medium to be compressed in the second compression chamber. During the compression process, the medium to be compressed exerts force on the valve core 24, so that the valve core 24 blocks the liquid inlet 20; further, when the pressure of the medium to be compressed reaches a preset threshold, the medium outlet valve core 27 exerts force to realize the opening of the one-way valve, completing the discharge of the compressed medium after secondary compression;

[0062] Step 2: When the piston rod 3 moves from the second compression chamber to the first compression chamber,

[0063] The corresponding baffle plate 6 and shift fork 7 in the first compression chamber both move toward the cylinder base 2. At this time, the baffle plate 6 drives the floating piston 8 to move toward the cylinder base 2. The inner surface of the baffle plate 6 blocks the piston liquid inlet 9, so that a closed cavity is formed between the first compression chamber and the piston rod rear channel 18, and the pre-compression of the medium to be compressed is gradually realized; further, as the pressure of the pre-compressed medium to be compressed gradually increases, the force of the medium to be compressed acts on the valve core 24, so that the valve core 24 overcomes the pressure of the valve core spring 23 and moves toward the second compression chamber, and finally the compressed medium in the aforementioned closed cavity enters the second compression chamber through the connecting liquid inlet 20, the piston rod rear channel 18 and the guide seat opening 25; the volume in the second compression chamber gradually increases during the aforementioned process.

[0064] When the pre-compressed compressed medium in the first compression chamber in the step 2 exceeds the preset threshold value, the compressed medium deforms the pressure protection spring 13 through the pressure relief port 19 and pushes the protective pressure cover 14 to move toward the second compression chamber, so that the compressed medium in the first compression chamber is released from the pressure relief port 19 and through the gap between the baffle plate 6 and the protective pressure cover 14; when the pressure relief is completed, the pressure protection spring 13 resets and drives the protective pressure cover 14 to continue to apply pressure to the surface of the baffle plate 6.

[0065] 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 spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double compression pump body structure, comprising a cylinder body (1) and a cylinder base (2), wherein the cylinder body (1) and the cylinder base (2) constitute a cavity structure of the compression pump body, characterized in that: A piston rod (3) adapted to the aforementioned cavity structure is provided at one end of the cylinder base (2); an inlet (4) for a medium to be compressed is provided on one side of the cylinder body (1) close to the cylinder base (2); and a compressed medium outlet (5) is provided on the other side of the cylinder body (1). The inlet (4) of the medium to be compressed is connected to the first compression chamber inside the cavity structure, the outlet (4) of the compressed medium is connected to the second compression chamber inside the cavity structure, and the first compression chamber and the second compression chamber are connected through the piston rod channel inside the piston rod (3).

2. A dual compression pump body structure according to claim 1, characterized in that: A liquid inlet sealing portion is sleeved on the piston rod (3) corresponding to the first compression chamber, the liquid inlet sealing portion comprising a baffle (6) and a shift fork (7) fixedly sleeved on the piston rod (3), and a movably arranged floating piston (8) is provided between the baffle (6) and the shift fork (7); A piston liquid inlet (9) is provided in the middle of the floating piston (8), and a shift fork liquid inlet (11) is provided at a position corresponding to the piston liquid inlet (9) and the shift fork (7).

3. A dual compression pump body structure according to claim 2, characterized in that: The liquid inlet sealing portion is also provided with a pressure protection member, the pressure protection member comprising a spring seat (12) fixedly sleeved on the piston rod (3), a pressure protection spring (13) being arranged in the spring seat (12), the end of the pressure protection spring (13) being in contact with the surface of the baffle plate (6) through a protection gland (14), and a pressure relief port (19) being provided at positions corresponding to the baffle plate (6) and the protection gland (14).

4. A dual compression pump body structure according to claim 3, characterized in that: A first retaining spring (15) is provided on the outer side of the spring seat (12), and a second retaining spring (16) is provided on the outer side of the shift fork (7).

5. A dual compression pump structure according to claim 1, characterized in that: The piston rod channel comprises a piston rod front channel (17) and a piston rod rear channel (18), a connecting liquid inlet (20) is provided between the piston rod front channel (17) and the piston rod rear channel (18), a pressure cap (21) is provided at the end of the piston rod (3), a valve core guide seat (22) extending into the piston rod rear channel (18) is provided on the pressure cap (21), a valve core spring (23) is provided inside the valve core guide seat (22), and a valve core (24) adapted to the connecting liquid inlet (20) is provided at the end of the valve core spring (23); A guide seat opening (25) communicating with the piston rod rear passage (18) and the second compression chamber is provided in the middle of the valve core guide seat (22).

6. A dual compression pump body structure according to claim 1, characterized in that: The compressed medium outlet (5) is provided with a one-way valve, which comprises a medium outlet spring (26) and a medium outlet valve core (27) adapted to the medium outlet spring (26).

7. A dual compression pump structure according to claim 1, characterized in that: A sealing filler (1) is provided on one side of the piston rod (3) corresponding to the cylinder seat (2), and a piston ring (10) is provided on the piston rod (3) corresponding to the cylinder body (1).

8. A compression method of a double compression pump structure, characterized in that: The compression method comprises the following steps: when the piston rod (3) moves in the direction of the second compression chamber, the medium to be compressed enters the first compression chamber in the chamber structure through the medium to be compressed inlet (4), and at the same time, the medium to be compressed is secondary compressed in the second compression chamber, and after the secondary compression, the compressed medium is discharged through the compression medium outlet (5); when the medium to be compressed completely enters the first compression chamber, the piston rod (3) is moved in the reverse direction, and pre-compression is performed in the first compression chamber, and after the pre-compression is completed, the compressed medium piston rod channel enters the second compression chamber.

9. A compression method of a dual compression pump structure according to claim 8, characterized in that: The compression method comprises the following steps: Step 1: When the piston rod (3) moves from the first compression chamber to the second compression chamber, The corresponding baffle plate (6) and shift fork (7) in the first compression chamber both move toward the direction of the second compression chamber, and at this time, the shift fork (7) drives the floating piston (8) to move toward the direction of the second compression chamber, the piston liquid inlet (9) and the shift fork liquid inlet (11) are in an open state, and the medium to be compressed in the medium to be compressed inlet (4) enters the first compression chamber; At the same time, the pressure cap (21) performs secondary compression on the medium to be compressed in the second compression chamber. During the compression process, the medium to be compressed exerts a force on the valve core (24), so that the valve core (24) blocks the liquid inlet (20). Furthermore, when the pressure of the medium to be compressed reaches a preset threshold, the medium outlet valve core (27) exerts a force to open the one-way valve, thereby completing the discharge of the compressed medium after the secondary compression. Step 2: When the piston rod (3) moves from the second compression chamber to the first compression chamber, The corresponding baffle plate (6) and shift fork (7) in the first compression chamber both move toward the cylinder seat (2), at which time the baffle plate (6) drives the floating piston (8) to move toward the cylinder seat (2), and the inner surface of the baffle plate (6) blocks the piston liquid inlet (9), so that a closed cavity is formed between the first compression chamber and the piston rod rear channel (18), and the pre-compression of the medium to be compressed is gradually achieved; further, as the pressure of the pre-compressed medium to be compressed gradually increases, the force of the medium to be compressed acts on the valve core (24), so that the valve core (24) overcomes the pressure of the valve core spring (23) and moves toward the second compression chamber, and finally the compressed medium in the aforementioned closed cavity enters the second compression chamber through the connecting liquid inlet (20), the piston rod rear channel (18) and the guide seat opening (25); During the above process, the volume in the second compression chamber gradually increases.

10. A compression method of a dual compression pump structure according to claim 9, characterized in that: When the pre-compressed compressed medium in the first compression chamber in step 2 exceeds a preset threshold value, the compressed medium deforms the pressure protection spring (13) through the pressure relief port (19) and pushes the protective pressure cover (14) to move toward the second compression chamber, so that the compressed medium in the first compression chamber is released from the pressure relief port (19) and through the gap generated between the baffle plate (6) and the protective pressure cover (14); when the pressure relief is completed, the pressure protection spring (13) is reset to drive the protective pressure cover (14) to continue to apply pressure to the surface of the baffle plate (6).

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