Double-compression pump body structure

Abstract

The utility model belongs to a double-compression pump body structure. 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 utility model belongs to medium compression pump technical field, especially relates to a double compression pump body structure. BACKGROUND

[0002] The compression pump is an important industrial equipment, and its main function is to lift low-pressure fluid into high-pressure fluid through certain mechanical action, wherein the reciprocating piston compression is a common compression pump equipment; this type of equipment drives the piston rod to reciprocate, and the fluid medium is introduced during the reciprocation, and the fluid medium is output after compression; the above process has the characteristics of simple structure and convenient use; however, there are defects of high energy consumption and low compression efficiency in the actual process. CONTENT

[0003] The utility model discloses a double compression pump body structure which overcomes the defects in the prior art.

[0004] The above technical purpose of the utility model is realized through the following technical scheme.

[0005] A double compression pump body structure, which comprises a cylinder body and a cylinder base, the cylinder body and the cylinder base constitute a cavity structure of the compression pump body, one end of the cylinder base is provided with a piston rod matched with the cavity structure, the side of the cylinder body close to the cylinder base is provided with a compressed medium inlet, the other side of the cylinder body is provided with a compressed medium outlet, the 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.

[0006] The utility model has the advantages that the first compression cavity communicated with the compressed medium inlet and the second compression cavity communicated with the compressed medium outlet can realize the secondary compression of the fluid medium in the utility model, and the secondary compression is realized under the normal operation of the compression pump, so that the energy saving and consumption reduction and the compression efficiency are improved.

[0007] Preferably, the piston rod corresponding to the first compression cavity is provided with a liquid inlet sealing part, the liquid inlet sealing part comprises a baffle disc and a fork, the baffle disc is fixedly arranged on the piston rod, and the fork is movably arranged between the baffle disc and the fork; the middle part of the floating piston is provided with a piston liquid inlet, and the fork liquid inlet is arranged at the position corresponding to the fork.

[0008] Preferably, the liquid inlet sealing part is further provided with a pressure protection member, the pressure protection member comprises a spring seat fixedly sleeved on the piston rod, a pressure protection spring is arranged in the spring seat, an end of the pressure protection spring is in contact with the surface of the baffle disc through a protection gland, and a pressure relief port is arranged on the baffle disc in a position corresponding to the protection gland.

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

[0010] Preferably, the piston rod channel comprises a front piston rod channel and a rear piston rod channel, a communication liquid inlet is arranged between the front piston rod channel and the rear piston rod channel, an end of the piston rod is provided with a pressure cap, the pressure cap is provided with a valve core guide seat extending into the rear piston rod channel, a valve core spring is arranged in the valve core guide seat, an end of the valve core spring is provided with a valve core matched with the communication liquid inlet, and a guide seat opening communicating the rear piston rod channel and the second compression cavity is arranged in the middle of the valve core guide seat.

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

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

[0013] The double compression pump body structure prepared according to the technical scheme has the characteristics that the first compression cavity communicated with the inlet of the medium to be compressed can realize the first compression (or pre-compression) of the medium to be compressed, the second compression cavity communicated with the compression medium outlet can realize the second compression of the medium compressed once, the two compression cavities are communicated through the piston rod channel in the piston rod, thereby realizing the twice compression without changing the working mode of the compression pump, the liquid inlet sealing part can realize the entry of the medium to be compressed into the first compression cavity and the sealing during the compression in the first compression cavity to ensure the pre-compression effect, the communication liquid inlet and the auxiliary components can realize the sealing during the compression in the first compression cavity and the second compression cavity, and when the compression medium in the first compression cavity reaches a certain threshold value after the compression in the first compression cavity, the opening can realize the entry of the compression medium in the first compression cavity into the second compression cavity, the utility model is based on the working process of the existing reciprocating compression pump, realizes that the first compression cavity is in the state of entering the medium to be compressed during the compression in the second compression cavity, the first compression cavity is pre-compressed when the piston rod is reversely moved after the medium to be compressed completely enters the first compression cavity, and the compression medium in the piston rod channel enters the second compression cavity after the pre-compression is completed, and the utility model has the characteristics of reasonable design, twice compression of the medium to be compressed to reduce the compression load in the original compression process, thereby achieving the energy saving, consumption reduction and compression efficiency improvement. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Fig. 1 This is a schematic diagram of the first compression chamber of this utility model when the medium to be compressed enters it.

[0016] Fig. 2 This is a schematic diagram of the compression medium entering the second compression chamber of this utility model.

[0017] Fig. 3 This is a schematic diagram of the structure of the shift fork of this utility model.

[0018] In the image above:

[0019] 1. Cylinder body; 2. Cylinder seat; 3. Piston rod; 4. Inlet of medium to be compressed; 5. Outlet of medium to be compressed; 6. Baffle plate; 7. Shift fork; 8. Floating piston; 9. Piston inlet; 10. Piston ring; 11. Shift fork inlet; 12. Spring seat; 13. Pressure protection spring; 14. Protective gland; 15. First snap ring; 16. Second snap ring; 17. Piston rod front channel; 18. Piston rod rear channel; 19. Sealing packing; 20. Connecting 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; 28. Pressure relief port. Detailed Implementation

[0020] The technical solution of this utility model will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0021] Reference Figs. 1-3The utility model relates to a kind of double-compression pump body structure, including cylinder body 1 and cylinder seat 2, cylinder body 1 and cylinder seat 2 form the cavity structure of compression pump body, one end of cylinder seat 2 is equipped with the piston rod 3 compatible with the aforementioned cavity structure, cylinder body 1 side close to cylinder seat 2 is equipped with the compressed medium inlet 4 to be, the other side of cylinder body 1 is equipped with compressed medium outlet 5, compressed medium inlet 4 is connected with the first compression cavity inside cavity structure, compressed medium outlet 5 is connected with the second compression cavity inside cavity structure, first compression cavity and second compression cavity are connected by the piston rod channel inside piston rod 3 between first compression cavity and second compression cavity.The utility model is applicable to the compression of gas, liquid, especially applicable to the compression of cryogenic liquid gas, compared with the utility model of traditional technology once compression, the utility model can reduce the work load of traditional once compression by pre-compression (once compression) and secondary compression, to achieve the characteristics of reducing energy consumption and improving compression efficiency, the utility model realizes pre-compression by first compression cavity, and the medium after pre-compression enters second compression cavity by piston rod channel to realize secondary compression, it needs to be specially noted that the working process of the utility model is same with the working process of traditional compression pump, and piston rod 3 not only can realize the purpose of pre-compression and secondary compression, but also can realize the circulation of medium, to achieve the characteristics of simple structure and reasonable design.

[0022] Further, the first compression cavity corresponding piston rod 3 is sleeved with liquid inlet sealing part, and the liquid inlet sealing part includes a flapper 6 and a fork 7, and the flapper 6 and the fork 7 are provided with a floating piston 8; the middle part of the floating piston 8 is provided with a piston liquid inlet 9, and the piston liquid inlet 9 is provided with a fork liquid inlet 11 corresponding to the position of the fork 7. The floating piston 8 in the utility model is movably arranged on the piston rod 3, and is driven to move by the flapper 6 or the fork 7 when the piston rod 3 moves, and the floating piston 8 can enter the medium to be compressed when the fork 7 drives the floating piston 8, and the floating piston 8 can seal the first compression cavity when the piston rod 3 moves; the above-mentioned setting can realize the characteristics of entering the medium to be compressed or pre-compressing the medium to be compressed in different states.

[0023] Further, the liquid inlet sealing part is further provided with a pressure protection piece, the pressure protection piece includes a spring seat 12 fixedly sleeved on the piston rod 3, the spring seat 12 is provided with a pressure protection spring 13, the end of the pressure protection spring 13 is in contact with the surface of the flapper 6 through a protection gland 14, and the flapper 6 and the protection gland 14 are provided with a pressure relief port 28 corresponding to the position. Through the above-mentioned setting, when the pressure of the medium to be compressed is too high during pre-compression, pressure relief can be realized; to avoid affecting the normal operation of the whole equipment.

[0024] Further, the outer side of the spring seat 12 is provided with a first snap spring 15, and the outer side of the shift fork 7 is provided with a second snap spring 16. Through the above setting, the first snap spring 15 and the second snap spring 16 can be set, and the spring seat 12 and the shift fork 7 can be fixed.

[0025] Further, the piston rod channel comprises a piston rod front channel 17 and a piston rod rear channel 18, and a communication liquid inlet 20 is arranged between the piston rod front channel 17 and the piston rod rear channel 18. The end of the piston rod 3 is provided with a pressure cap 21, the pressure cap 21 is provided with a valve core guide seat 22 extending into the piston rod rear channel 18, the valve core guide seat 22 is internally provided with a valve core spring 23, and the end of the valve core spring 23 is provided with a valve core 24 matched with the communication liquid inlet 20. The middle part of the valve core guide seat 22 is provided with a guide seat opening 25 communicating the piston rod rear channel 18 and the second compression cavity. The utility model realizes the communication between the first compression cavity and the second compression cavity through the setting of the communication liquid inlet 20, realizes the purpose of entering the second compression cavity when the pressure of the first compression cavity is too large through the cooperation of the valve core spring 23 and the valve core 24, and avoids the feature that the compression medium of the second compression cavity returns to the first compression cavity.

[0026] Further, the compression medium outlet 5 is provided with a one-way valve, and the one-way valve comprises a medium outlet spring 26 and a medium outlet valve core 27 matched with the medium outlet spring 26.

[0027] Further, the cylinder seat 2 is provided with a sealing packing 19 on the side corresponding to the piston rod 3, and the cylinder body 1 is provided with a piston ring 10 on the piston rod 3.

[0028] The utility model also provides a compression method of the double compression pump body structure, which comprises the following steps:

[0029] The utility model also provides a compression method of the double compression pump body structure, which comprises the following steps:

[0030] Step 1: when the piston rod 3 moves from the first compression cavity to the second compression cavity,

[0031] The corresponding baffle disc 6 and the yoke 7 in the first compression chamber move towards the direction of the second compression chamber, at this time the yoke 7 drives the floating piston 8 to move towards the direction of the second compression chamber, the piston inlet 9 and the yoke inlet 11 are in an open state, and the compressed medium in the compressed medium inlet 4 enters the first compression chamber;

[0032] At the same time, the compression cap 21 performs secondary compression on the compressed medium in the second compression chamber, and in the compression process, the compressed medium exerts force on the valve core 24 to block the communication inlet 20; further, when the pressure of the compressed medium reaches a preset threshold, the compressed medium outlet valve core 27 exerts force to realize the opening of the one-way valve, and the discharge of the compressed medium after secondary compression is completed;

[0033] Step 2: When the piston rod 3 moves from the second compression chamber to the direction of the first compression chamber,

[0034] The corresponding baffle disc 6 and the yoke 7 in the first compression chamber move towards the direction of the cylinder base 2, at this time the baffle disc 6 drives the floating piston 8 to move towards the direction of the cylinder base 2, the inner surface of the baffle disc 6 blocks the piston inlet 9, so that a closed cavity is formed between the first compression chamber and the piston rod rear passage 18, and the pre-compression of the compressed medium is gradually realized; further, as the pressure of the pre-compressed compressed medium gradually increases, the force of the compressed medium acts on the valve core 24, so that the valve core 24 moves towards the direction of the second compression chamber against the pressure of the valve core spring 23, and finally the compressed medium in the aforementioned closed cavity enters the second compression chamber through the communication inlet 20, the piston rod rear passage 18 and the guide seat opening 25; the volume of the second compression chamber gradually increases in the aforementioned process.

[0035] Further, when the pre-compressed compressed medium in the first compression chamber in the step 2 exceeds a preset threshold, the compressed medium passes through the pressure relief port 28 to deform the pressure protection spring 13 and drive the protection gland 14 to move towards the direction of the second compression chamber, so that the compressed medium in the first compression chamber is discharged from the pressure relief port 28 and through the gap between the baffle disc 6 and the protection gland 14; after the pressure relief is completed, the pressure protection spring 13 is reset to drive the protection gland 14 to continue to press the surface of the baffle disc 6.

[0036] The technical scheme of the utility model is different from the common plunger type liquid pump in that no liquid inlet valve is arranged, liquid inlet and compression discharge of the first compression cavity (pre-compression cavity) are achieved by the different positions of the floating piston 8; the first compression cavity is ingeniously arranged at the middle part of the piston rod 3, so that the direction of one-time compression is opposite to that of two-time compression, which is different from the conventional liquid pump that can only compress once in one reciprocating action, realizes that one reciprocating action can complete one compression and two compression processes, i.e. two-stage compression; under the condition that the inlet and outlet pressures are certain and the compression ratio is certain, the compression ratio of single stage can be effectively reduced, so that the compression process work and shaft power are reduced; it can also be considered that the one-time compression process utilizes the work of the return stroke of the piston rod 3; at the same time, the double-acting cylinder of the piston type compressor can also be analogized, and the efficiency is higher; compared with the common plunger type liquid pump, the shaft power of this structure can be reduced by 5%-10%. In addition, due to the limitation of structural strength, the pre-compression pressure cannot be too high, so the overpressure relief device is arranged, which avoids the safe operation problem of overpressure and also enables the first compression cavity to play a key pre-compression role. The utility model is especially suitable for the compression of low-temperature liquid; specifically, because the low-temperature liquid is easy to vaporize in the compression process, the compression efficiency is affected, and then the compression process of the pump body is affected; the pre-compression in the utility model can effectively reduce the liquid vaporization in the two-stage compression process. Because the pre-compression increases the pressure of the low-temperature liquid, the saturation temperature point of the low-temperature liquid is also increased, so the liquid is less likely to vaporize, and it can also be considered that the liquid entering the final compression is in a supercooled state. The inlet cavitation allowance NPSH of the common low-temperature liquid pump is about 1m, and the inlet cavitation allowance NPSH of the low-temperature 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 inlet amount of the two-stage compression is ensured; the compression efficiency is improved.

[0037] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A double compression pump body structure comprising a cylinder block (1) and a cylinder head (2) which form a cavity structure of a compression pump body, characterized in that: One end of the cylinder base (2) is provided with a piston rod (3) matched with the cavity structure, the side of the cylinder body (1) close to the cylinder base (2) is provided with a compressed medium inlet (4), and the other side of the cylinder body (1) is provided with a compressed medium outlet (5), The compressed medium inlet (4) is communicated with the first compression cavity in the cavity structure, the compressed medium outlet (5) is communicated with the second compression cavity in the cavity structure, and the first compression cavity and the second compression cavity are communicated through the piston rod channel in the piston rod (3).

2. A twin-compression pump body structure according to claim 1, characterized by: The piston rod (3) corresponding to the first compression cavity is sleeved with a liquid inlet sealing part, the liquid inlet sealing part comprises a baffle disc (6) fixedly sleeved on the piston rod (3) and a fork (7), and a floating piston (8) movably arranged between the baffle disc (6) and the fork (7) is arranged. The middle part of the floating piston (8) is provided with a piston liquid inlet (9), and the position corresponding to the fork liquid inlet (11) of the fork (7) is provided with a fork liquid inlet (11).

3. A twin-compression pump body structure according to claim 2, characterized in that: The liquid inlet sealing part is further provided with a pressure protection piece, the pressure protection piece comprises a spring seat (12) fixedly sleeved on the piston rod (3), the spring seat (12) is provided with a pressure protection spring (13) therein, the end of the pressure protection spring (13) is in contact with the surface of the baffle disc (6) through a protection gland (14), and the baffle disc (6) is provided with a pressure relief port (28) corresponding to the protection gland (14).

4. A twin-compression pump body structure according to claim 3, characterized by: The outer side of the spring seat (12) is provided with a first clamping spring (15), and the outer side of the fork (7) is provided with a second clamping spring (16).

5. The dual compression pump body structure of claim 1, wherein: The piston rod channel comprises a piston rod front channel (17) and a piston rod rear channel (18), a communication liquid inlet (20) is arranged between the piston rod front channel (17) and the piston rod rear channel (18), the end of the piston rod (3) is provided with a pressure cap (21), the pressure cap (21) is provided with a valve core guide seat (22) extending into the piston rod rear channel (18), the valve core guide seat (22) is provided with a valve core spring (23) therein, and the end of the valve core spring (23) is provided with a valve core (24) matched with the communication liquid inlet (20). The middle part of the valve core guide seat (22) is provided with a guide seat opening (25) communicating the piston rod rear channel (18) and the second compression cavity.

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

7. The dual compression pump body structure of claim 1, wherein: The side of the piston rod (3) corresponding to the cylinder base (2) is provided with a sealing packing (19), and the piston ring (10) is arranged on the piston rod (3) corresponding to the cylinder body (1).

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