A double-acting diaphragm compressor oil cylinder structure with stuffing box seal

Abstract

The present invention discloses a double-acting diaphragm compressor oil cylinder structure sealed by a stuffing box, wherein the oil cylinder body is provided with an accommodating chamber, one end of the piston rod penetrates into the accommodating chamber and is provided with a piston head, the piston head is slidably connected to the accommodating chamber, the other end of the piston rod penetrates the open end of the accommodating chamber and is connected to the power output end of the crankcase; a horizontal cylinder is provided at the end of the piston head away from the piston rod; a vertical cylinder is vertically provided on the side wall of the accommodating chamber; a stuffing box is sleeved on the outer peripheral side of the end of the piston rod away from the piston head, the stuffing box is provided at the open end of the accommodating chamber, and a plurality of sealing rings are provided on the inner side wall of the stuffing box contacting the piston rod. The purpose is to solve the problem that the existing single-acting diaphragm compressor has a single action and the differential diaphragm compressor has high requirements for the processing accuracy of the piston. The technical effects achieved are: increasing the gas processing volume of the compressor, saving costs and space; reducing the processing difficulty and material cost of the piston; the internal structure is simple and easy to inspect and maintain.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of diaphragm compressors, and in particular to a double-acting diaphragm compressor cylinder structure with a stuffing box seal. Background Art

[0002] Diaphragm compressor is a special structure of positive displacement compressor, the highest level of compression in the field of gas compression, this compression method has no secondary pollution, very good protection for the compressed gas, with a large compression ratio, good sealing, compressed gas is not contaminated by lubricating oil and other solid impurities. Therefore, it is suitable for compressing high-purity, rare and precious, flammable and explosive, toxic and harmful, corrosive and high-pressure gases.

[0003] The existing diaphragm compressor oil cylinder structure mainly includes cover side single-acting and differential cylinder, among which most are cover side single-acting structures, such as Figure 3 As shown, a single-acting piston 2a is arranged in the single-acting cylinder body 1a, and a single-acting oil chamber is arranged outside the single-acting piston 2a; the oil cylinder structure of a few diaphragm compressors is a differential oil cylinder, such as Figure 4 As shown, the cover side of the double-acting cylinder body 1b is one-level, and a first oil chamber 4b is arranged on the cover side; the shaft side is two-level, and a second oil chamber 5b is arranged on the shaft side; a first piston segment 2b and a second piston segment 3b are arranged in the double-acting cylinder body 1b, which are connected to each other, wherein the second oil chamber 5b is communicated with the outer peripheral side of the second piston segment 4b, and the hydraulic oil is sealed by piston rings on the piston segments at both ends of the second oil chamber 5b. The existing problems are: the single-acting diaphragm compressor has a single action, and the differential diaphragm compressor has the problem that the cylinder structure has high requirements on the processing accuracy of the piston and is difficult to repair, which limits the selection range of single-stage compression and large gas volume models. Summary of the invention

[0004] To this end, an embodiment of the present invention provides a double-acting diaphragm compressor cylinder structure with a stuffing box seal to solve the problem in the prior art that single-acting diaphragm compressors have a single function and that the cylinder structure of differential diaphragm compressors has high requirements on the machining accuracy of the piston.

[0005] In order to achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0006] According to the first aspect of an embodiment of the present invention, a double-acting diaphragm compressor cylinder structure with a stuffing box seal comprises a crankcase, a cylinder body, a piston rod, a piston head, a stuffing box, a plurality of sealing rings, a vertical cylinder and a horizontal cylinder; the cylinder body is provided with a through accommodating chamber, one end of the piston rod is inserted into the accommodating chamber and is fixed with a piston head, the piston head is slidably connected to the accommodating chamber, the other end of the piston rod passes through the open end of the accommodating chamber and is transmission-connected to the power output end of the crankcase; a horizontal cylinder is provided at the end of the piston head away from the piston rod, and the horizontal cylinder is fixed on the cylinder body; a vertical cylinder is vertically provided on the side wall of the accommodating chamber, and the vertical cylinder is fixed on the cylinder body; a stuffing box is sleeved on the outer peripheral side of the end of the piston rod away from the piston head, the stuffing box is fixed to the open end of the accommodating chamber in the cylinder body, and a plurality of sealing rings are provided on the inner side wall of the stuffing box contacting the piston rod.

[0007] Furthermore, the stuffing box includes a packing flange and multiple stuffing boxes, all of which are annular structures, and all of which are fixedly mounted on the outer peripheral side of the piston rod. A sealing ring is provided at the contact point between each stuffing box and the outer side wall of the piston rod; the multiple stuffing boxes are fixedly connected in sequence, the stuffing box close to the piston rod abuts against the step surface opened in the accommodating cavity, and the stuffing box located outside the accommodating cavity abuts against the packing flange, the packing flange is mounted on the outer peripheral side of the piston rod, and the packing flange is detachably connected to the cylinder body.

[0008] Furthermore, the stuffing box is made of 20Cr13 stainless steel.

[0009] Furthermore, a plurality of stuffing boxes are fixed together through bolts, and a stuffing flange is fastened to an end of the oil cylinder body away from the horizontal cylinder through bolts.

[0010] Furthermore, an annular sealing ring is provided on the outer end surface of the stuffing box close to the piston rod that contacts the step surface in the accommodating cavity.

[0011] Furthermore, it also includes a crankshaft, a connecting rod and a crosshead. The crankshaft is arranged in a crankcase, one end of the connecting rod is sleeved on the crankshaft, the other end of the connecting rod is transmission-connected to one end of the crosshead, and the other end of the crosshead is connected to the piston rod.

[0012] Furthermore, the horizontal cylinder includes a horizontal cylinder body, a horizontal cylinder head, a horizontal diaphragm, a first intake check valve and a first exhaust check valve; one end of the horizontal cylinder body is fixed on the oil cylinder body, a horizontal cylinder head is provided at the other end of the horizontal cylinder body, a horizontal diaphragm is provided between the horizontal cylinder body and the horizontal cylinder head, a horizontal oil chamber is provided in the horizontal cylinder body, one end of the horizontal oil chamber abuts against the piston head, and the other end of the horizontal oil chamber acts on the oil chamber side of the horizontal diaphragm through a pipeline; a first intake port and a first exhaust port connected to the air chamber side of the horizontal diaphragm are provided on the horizontal cylinder head, a first intake check valve is provided in the first intake port, and a first exhaust check valve is provided in the first exhaust port.

[0013] Furthermore, the vertical cylinder includes a vertical cylinder body, a vertical cylinder head, a vertical diaphragm, a second intake check valve and a second exhaust check valve; one end of the vertical cylinder body is perpendicular to the axis of the piston rod and fixed on the cylinder body, the other end of the vertical cylinder body is provided with a vertical cylinder head, a vertical diaphragm is provided between the vertical cylinder body and the vertical cylinder head, a vertical oil chamber is provided in the vertical cylinder body, one end of the vertical oil chamber is connected with the oil chamber on the outer peripheral side of the piston rod, and the other end of the vertical oil chamber acts on the oil chamber side of the vertical diaphragm through a pipeline; a second intake port and a second exhaust port are provided on the vertical cylinder head, a second intake check valve is provided in the second intake port, and a second exhaust check valve is provided in the second exhaust port; the center line of the vertical cylinder and the center line of the horizontal cylinder are perpendicular to each other.

[0014] Furthermore, it also includes a cylinder liner, which is a tubular structure. An annular protrusion is arranged at one end of the cylinder liner. The outer peripheral side of the cylinder liner is embedded in the accommodating cavity in the cylinder body. The annular protrusion abuts against the open end of the accommodating cavity. The piston head is slidably connected in the cylinder liner.

[0015] Furthermore, it also includes a plurality of piston sealing rings, which are all sleeved on the outer peripheral side of the piston head, and the outer peripheral sides of the plurality of piston sealing rings are all in contact with the inner side wall of the cylinder sleeve.

[0016] The present invention has the following advantages: through the oil cylinder body structure of the present invention, a double-stage diaphragm compressor is realized, which replaces the single-acting structure with double diaphragm heads on the cover side, saves the space occupied by the compressor, and makes the force more balanced; the characteristics of the cover side and the shaft side working at the same time are realized, the ability of the compressor to process gas volume is increased, the power consumption is reduced, and the hydraulic and pneumatic transmission technology is fully utilized; by installing the stuffing box component on the oil cylinder shaft side, the stuffing ring group inside the stuffing component clamps the piston rod, and when the compressor reciprocates, the sealing of the hydraulic oil on the oil cylinder shaft side is achieved; the single-stage double-acting working form of the oil cylinder is realized, the ability of the diaphragm compressor to process gas volume is doubled, and the number of diaphragm compressors used is reduced, which not only saves the floor space, but also reduces the power loss, and significantly improves the use efficiency of the diaphragm compressor; the air volume processed by the compressor is increased, and the compressor cost and floor space are saved for users; the processing difficulty and material cost of the double-acting diaphragm compressor piston are reduced; the internal structure is simple and easy to inspect and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0018] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0019] Figure 1 A cross-sectional structural diagram of a double-acting diaphragm compressor cylinder structure with a stuffing box seal provided in some embodiments of the present invention.

[0020] Figure 2 A partial structural diagram of a double-acting diaphragm compressor cylinder structure with a stuffing box seal provided in some embodiments of the present invention.

[0021] Figure 3 This is the first type of prior art structure diagram.

[0022] Figure 4 This is a structural diagram of the second type of prior art.

[0023] In the figure: 1, crankshaft, 2, connecting rod, 3, crosshead, 4, cylinder body, 5, piston rod, 6, piston head, 7, stuffing box, 8, sealing ring, 9, vertical oil chamber, 10, horizontal oil chamber, 11, horizontal cylinder body, 12, horizontal cylinder head, 13, vertical cylinder body, 14, vertical cylinder head, 15, horizontal diaphragm, 16, vertical diaphragm, 17, first air inlet, 18, first exhaust port, 19, first air inlet check valve, 20, First exhaust check valve, 21, second air intake port, 22, second exhaust port, 23, second air intake check valve, 24, second exhaust check valve, 25, packing flange, 26, packing box, 27, crankcase, 28, cylinder liner, 1a, single-acting cylinder body, 2a, single-acting piston, 3a, single-acting oil chamber, 1b, double-acting cylinder body, 2b, first piston section, 3b, second piston section, 4b, first oil chamber, 5b, second oil chamber. DETAILED DESCRIPTION

[0024] The following is a description of the implementation of the present invention by specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, not 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.

[0025] Example 1

[0026] like Figure 1 and Figure 2As shown, a double-acting diaphragm compressor cylinder structure sealed by a stuffing box 7 in this embodiment comprises a crankcase 27, a cylinder body 4, a piston rod 5, a piston head 6, a stuffing box 7, a plurality of sealing rings 8, a vertical cylinder and a horizontal cylinder; the cylinder body 4 is provided with a through accommodating chamber, one end of the piston rod 5 is inserted into the accommodating chamber and is fixed with a piston head 6, the piston head 6 is slidably connected with the accommodating chamber, the other end of the piston rod 5 passes through the open end of the accommodating chamber and is transmission-connected with the power output end of the crankcase 27, for example, the connection method is a crank-connecting rod mechanism connection; a horizontal cylinder is provided at the end of the piston head 6 away from the piston rod 5, and the horizontal cylinder is fixed on the cylinder body 4; a vertical cylinder is vertically provided on the side wall of the accommodating chamber, and the vertical cylinder is fixed on the cylinder body 4; a stuffing box 7 is sleeved on the outer peripheral side of the end of the piston rod 5 away from the piston head 6, and the stuffing box 7 is fixed on the cylinder body 4 At the open end of the accommodating chamber in the cylinder body 4, a plurality of sealing rings 8 are arranged on the inner side wall of the stuffing box 7 contacting the piston rod 5, the outer peripheral side of the stuffing box 7 is fastened in the cylinder body 4, a gap is arranged between the inner side wall of the stuffing box 7 and the piston rod 5, a plurality of sealing rings 8 are all abutted against the piston rod 5, and the piston rod 5 telescopes and moves on the plurality of sealing rings 8. In the present embodiment, the stuffing box 7 is partially embedded in the cylinder body 4, an annular oil chamber is arranged between the piston rod 5 and the inner side wall of the accommodating chamber, the annular oil chamber is connected with the oil chamber of the vertical cylinder, the stuffing box 7 is directly in contact with the hydraulic oil in the cylinder, and there is no need for cooling water circulation to cool the stuffing box 7, thereby simplifying the sealing structure of the stuffing box 7. The cylinder structure of the stuffing box 7 in the present embodiment realizes the combination of two traditional single-acting diaphragm compressors into a double-acting diaphragm compressor, thereby improving the working capacity of the compressor.

[0027] The technical effects achieved by this embodiment are as follows: through the cylinder body 4 structure of this embodiment, a double-stage diaphragm compressor is realized, replacing the single-acting structure with double diaphragm heads on the cover side, saving the space occupied by the compressor and making the force more balanced; the characteristics of the cover side and the shaft side working at the same time are realized, the ability of the compressor to handle gas volume is increased, power consumption is reduced, and the hydraulic and pneumatic transmission technology is fully utilized; by installing the stuffing box 7 component on the cylinder shaft side, the stuffing ring group inside the stuffing component clamps the piston rod 5, and when the compressor reciprocates, the hydraulic oil on the cylinder shaft side is sealed; the single-stage double-acting working form of the cylinder is realized, the ability of the diaphragm compressor to handle gas volume is doubled, the number of diaphragm compressors used is reduced, which not only saves floor space, but also reduces power loss, and significantly improves the use efficiency of the diaphragm compressor; the gas volume handled by the compressor is increased, saving the compressor cost and floor space for users; the processing difficulty and material cost of the double-acting diaphragm compressor piston are reduced; the internal structure is simple and easy to inspect and maintain.

[0028] Example 2

[0029] like Figure 1 and Figure 2As shown, a double-acting diaphragm compressor cylinder structure sealed by a stuffing box 7 in this embodiment includes all the technical features of Example 1. In addition, the stuffing box 7 includes a packing flange 25 and a plurality of stuffing boxes 26. The plurality of stuffing boxes 26 are all annular structures. The plurality of stuffing boxes 26 are all sleeved and fixed on the outer peripheral side of the piston rod 5. A sealing ring 8 is provided at the contact point between each stuffing box 26 and the outer side wall of the piston rod 5; the plurality of stuffing boxes 26 are fixedly connected in sequence, an annular step surface is provided on the inner side wall of the accommodating cavity of the cylinder body 4, the stuffing box 26 close to the piston rod 5 abuts on the step surface provided in the accommodating cavity, and the stuffing box 26 located outside the accommodating cavity abuts on the packing flange 25. The packing flange 25 is sleeved on the outer peripheral side of the piston rod 5, and the packing flange 25 is detachably connected to the cylinder body 4; an annular sealing ring is provided on the outer end surface of the stuffing box 26 close to the piston rod 5 that contacts the step surface in the accommodating cavity.

[0030] Preferably, the stuffing box 26 is made of 20Cr13 stainless steel. In addition, the stuffing box 26 can also be made of other stainless steel materials with better heat dissipation.

[0031] Optionally, a plurality of stuffing boxes 26 are fixed together by bolts, and a stuffing flange 25 is fastened to an end of the cylinder body 4 away from the horizontal cylinder by bolts.

[0032] The beneficial effects of this embodiment are as follows: through this embodiment, the stuffing box 7 is set as a combination structure of a packing flange 25 and a plurality of stuffing boxes 26, which simplifies the processing difficulty of the stuffing box 7, reduces the processing cost of the stuffing box 7, and makes the installation of the stuffing box 7 convenient and quick. The length of the stuffing box 7 extending into the interior of the cylinder body 4 can be changed, and different numbers of stuffing boxes 26 can be set according to the sizes of different cylinder bodies 4, which reduces the difficulty of processing different stuffing boxes 7 for oil chambers of different depths, significantly saves processing costs, significantly improves the versatility of the stuffing box 7, and is conducive to the standardization of the stuffing box 7.

[0033] Example 3

[0034] like Figure 1 and Figure 2 As shown, a double-acting diaphragm compressor cylinder structure sealed by a stuffing box 7 in this embodiment includes all the technical features in Example 3, and in addition, includes a crankshaft 1, a connecting rod 2 and a crosshead 3, wherein the crankshaft 1 and the connecting rod 2 constitute a crank-connecting rod mechanism, which converts rotational power into linear reciprocating motion, the crankshaft 1 is arranged in a crankcase 27, one end of the connecting rod 2 is sleeved on the crankshaft 1, the other end of the connecting rod 2 is transmission-connected to one end of the crosshead 3, and the other end of the crosshead 3 is connected to the piston rod 5. The crosshead 3 of this embodiment is slidingly connected in a shell on one side of the crankcase 27, the connecting rod 2 is rotationally connected to one shaft end of the crosshead 3, and the axis of the shaft end is perpendicular to the axis of the connecting rod.

[0035] The beneficial effects of this embodiment are as follows: by providing the crank-connecting rod mechanism and the crosshead 3, the stability of pushing the piston component to move is improved, the power conversion efficiency is high, and the service life is long.

[0036] Example 4

[0037] like Figure 1 and Figure 2 As shown, a double-acting diaphragm compressor cylinder structure sealed by a stuffing box 7 in this embodiment includes all the technical features of Example 3. In addition, the horizontal cylinder includes a horizontal cylinder body 11, a horizontal cylinder head 12, a horizontal diaphragm 15, a first intake check valve 19 and a first exhaust check valve 20; one end of the horizontal cylinder body 11 is fixed to the cylinder body 4, the other end of the horizontal cylinder body 11 is provided with a horizontal cylinder head 12, a horizontal diaphragm 15 is provided between the horizontal cylinder body 11 and the horizontal cylinder head 12, a horizontal oil chamber 10 is provided in the horizontal cylinder body 11, and one end of the horizontal oil chamber 10 is provided. Abutting against the piston head 6, the other end of the horizontal oil chamber 10 acts on the oil chamber side of the horizontal diaphragm 15 through a pipeline; the horizontal cylinder head 12 is provided with a first air inlet 17 and a first exhaust port 18 which are connected to the air chamber side of the horizontal diaphragm 15, the first air inlet 17 is provided with a first air inlet check valve 19, the first exhaust port 18 is provided with a first exhaust check valve 20, the first air inlet check valve 19 is used to limit the external air from entering the side of the horizontal diaphragm 15 in the horizontal cylinder, the first exhaust check valve 20 is used to limit the air on the side of the horizontal diaphragm 15 from being discharged from the horizontal cylinder in one direction; vertical cylinder It includes a vertical cylinder body 13, a vertical cylinder head 14, a vertical diaphragm 16, a second intake check valve 23 and a second exhaust check valve 24; one end of the vertical cylinder body 13 is perpendicular to the axis of the piston rod 5 and fixed on the oil cylinder body 4, the other end of the vertical cylinder body 13 is provided with a vertical cylinder head 14, a vertical diaphragm 16 is provided between the vertical cylinder body 13 and the vertical cylinder head 14, a vertical oil chamber 9 is provided in the vertical cylinder body 13, one end of the vertical oil chamber 9 is connected with the oil chamber on the outer peripheral side of the piston rod 5, and the other end of the vertical oil chamber 9 acts on the oil chamber side of the vertical diaphragm 16 through a pipeline; the vertical cylinder head 1 4 is provided with a second air inlet 21 and a second air outlet 22 which are in communication with the air cavity side of the vertical diaphragm 16, a second air inlet check valve 23 is provided in the second air inlet 21, and a second air outlet check valve 24 is provided in the second air outlet 22, the second air inlet check valve 23 is used to limit the external air from entering the side of the vertical diaphragm 16 in the vertical cylinder, and the second air outlet check valve 24 is used to limit the air on the side of the vertical diaphragm 16 from being discharged from the vertical cylinder in one direction; the center line of the vertical cylinder is perpendicular to the center line of the horizontal cylinder, and the axis of the vertical cylinder and the horizontal cylinder may also be at other angles.

[0038] The beneficial effects of this embodiment are as follows: by arranging a vertical cylinder and a horizontal cylinder, two traditional single-acting diaphragm compressors are combined into a double-acting diaphragm compressor, thereby improving the working capacity of the compressor; by arranging a one-way valve in the air inlet and the exhaust port, the adverse effects caused by the backflow of the gas are avoided.

[0039] Example 5

[0040] like Figure 1 and Figure 2 As shown, a double-acting diaphragm compressor cylinder structure sealed by a stuffing box 7 in this embodiment includes all the technical features of Example 4, and in addition, includes a cylinder sleeve 28. The cylinder sleeve 28 is a tubular structure, and an annular protrusion is provided at one end of the cylinder sleeve 28. The outer peripheral side of the cylinder sleeve 28 is embedded in the accommodating cavity in the cylinder body 4, and the annular protrusion abuts the open end of the accommodating cavity. The piston head 6 is slidably connected in the cylinder sleeve 28; it also includes a plurality of piston sealing rings, and the plurality of piston sealing rings are all sleeved on the outer peripheral side of the piston head 6, and the outer peripheral sides of the plurality of piston sealing rings abut against the inner side wall of the cylinder sleeve 28.

[0041] The beneficial effects of this embodiment are as follows: by providing the cylinder sleeve 28, the requirements for the machining accuracy inside the cylinder body 4 required for the sliding connection between the cylinder body 4 and the piston head 6 are reduced; when the parts slidingly connected to the piston head 6 are worn, there is no need to replace the entire cylinder body 4, only the cylinder sleeve 28 needs to be replaced, which significantly reduces the maintenance cost and increases the service life of the cylinder body 4; at the same time, the machining cost of the cylinder body 4 is significantly reduced.

[0042] The working principle of the double-acting diaphragm compressor sealed by the stuffing box 7 in the above embodiment is as follows: the crank-connecting rod mechanism composed of the crank and the connecting rod 2 drives the crosshead 3 to do reciprocating motion, so that the piston rod 5 connected to the crosshead 3 pushes the piston head 6, the piston head 6 pushes the hydraulic oil in the cylinder body 4, the hydraulic oil pushes the horizontal diaphragm 15 in the horizontal cylinder, the horizontal diaphragm 15 compresses the gas, and the piston head 6 completes one suction and exhaust process of the compressor with each reciprocating stroke. When the piston head 6 is at the dead point on the cover side, the first-stage horizontal cylinder just completes the exhaust process, and the first-stage vertical cylinder The suction process is just completed; conversely, when the piston head 6 is at the dead point on the shaft side, the first-stage horizontal cylinder just completes the suction process, and the first-stage vertical cylinder just completes the exhaust process. In order to ensure that the first-stage vertical cylinder can complete normal suction and exhaust work, a sealing system of a stuffing box 7 is arranged on the shaft side of the cylinder body 4. A plurality of sealing rings 8 in the stuffing box 7 form a mechanical seal to prevent the hydraulic oil in the shaft side cylinder body 4 from flowing into the crankcase 27, thereby achieving the stability of the oil pressure of the hydraulic oil in the shaft side cylinder body 4, and ensuring and improving the working performance of the double-acting diaphragm compressor.

[0043] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

[0044] The terms such as "upper", "lower", "left", "right", "middle", etc. cited in this specification are only for the convenience of description and are not intended to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should be regarded as within the scope of implementation of the present invention without substantially changing the technical content.

Claims

1. A double-acting diaphragm compressor cylinder structure with a stuffing box seal, characterized in that: The invention comprises a crankcase (27), a cylinder body (4), a piston rod (5), a piston head (6), a stuffing box (7), a plurality of sealing rings (8), a vertical cylinder and a horizontal cylinder; the cylinder body (4) is provided with a through accommodating cavity, one end of the piston rod (5) penetrates into the accommodating cavity and is fixed with the piston head (6), the piston head (6) is slidably connected with the accommodating cavity, the other end of the piston rod (5) penetrates out of the open end of the accommodating cavity and is transmission-connected with the power output end of the crankcase (27); the horizontal cylinder is provided at one end of the piston head (6) away from the piston rod (5), and the horizontal cylinder is fixed on the cylinder body (4); a vertically disposed The vertical cylinder is arranged and fixed on the cylinder body (4); the stuffing box (7) is sleeved on the outer peripheral side of one end of the piston rod (5) away from the piston head (6); the stuffing box (7) is fixed to the open end of the accommodating cavity in the cylinder body (4); a plurality of sealing rings (8) are arranged on the inner side wall of the stuffing box (7) contacting the piston rod (5); the outer peripheral side of the stuffing box (7) is fastened in the cylinder body (4); a gap is arranged between the inner side wall of the stuffing box (7) and the piston rod (5); the plurality of sealing rings (8) are all in contact with the piston rod (5); and the piston rod (5) moves telescopically on the plurality of sealing rings (8); It also includes a cylinder sleeve (28), the cylinder sleeve (28) is a tubular structure, one end of the cylinder sleeve (28) is provided with an annular protrusion, the outer peripheral side of the cylinder sleeve (28) is embedded in the accommodating cavity in the oil cylinder body (4), the annular protrusion abuts against the open end of the accommodating cavity, and the piston head (6) is slidably connected in the cylinder sleeve (28); It also includes a plurality of piston sealing rings, wherein the plurality of piston sealing rings are sleeved on the outer peripheral side of the piston head (6), and the outer peripheral sides of the plurality of piston sealing rings are in contact with the inner side wall of the cylinder sleeve (28); The stuffing box (7) comprises a stuffing flange (25) and a plurality of stuffing boxes (26), all of which are annular structures. The plurality of stuffing boxes (26) are all sleeved and fixed on the outer peripheral side of the piston rod (5), and the sealing ring (8) is provided at the contact point between each stuffing box (26) and the outer side wall of the piston rod (5); the plurality of stuffing boxes (26) are fixedly connected in sequence, the stuffing box (26) close to the piston rod (5) abuts against the step surface opened in the accommodating cavity, and the stuffing box (26) located outside the accommodating cavity abuts against the stuffing flange (25), the stuffing flange (25) is sleeved on the outer peripheral side of the piston rod (5), and the stuffing flange (25) is detachably connected to the cylinder body (4).

2. A double-acting diaphragm compressor oil cylinder structure with a stuffing box seal according to claim 1, characterized in that: The stuffing box (26) is made of 20Cr13 stainless steel.

3. A double-acting diaphragm compressor oil cylinder structure with a stuffing box seal according to claim 1, characterized in that: The plurality of stuffing boxes (26) are fixed together by bolts, and the stuffing flange (25) is fastened to the end of the oil cylinder body (4) away from the horizontal cylinder by bolts.

4. A double-acting diaphragm compressor oil cylinder structure with a stuffing box seal according to claim 1, characterized in that: An annular sealing ring is provided on the outer end surface of the stuffing box (26) close to the piston rod (5) and in contact with the step surface in the accommodating cavity.

5. A double-acting diaphragm compressor oil cylinder structure with a stuffing box seal according to claim 1, characterized in that: It also includes a crankshaft (1), a connecting rod (2) and a crosshead (3), wherein the crankshaft (1) is arranged in the crankcase (27), one end of the connecting rod (2) is sleeved on the crankshaft (1), the other end of the connecting rod (2) is transmission-connected to one end of the crosshead (3), and the other end of the crosshead (3) is connected to the piston rod (5).

6. A double-acting diaphragm compressor oil cylinder structure with a stuffing box seal according to claim 1, characterized in that: The horizontal cylinder comprises a horizontal cylinder body (11), a horizontal cylinder head (12), a horizontal diaphragm (15), a first intake check valve (19) and a first exhaust check valve (20); one end of the horizontal cylinder body (11) is fixed to the oil cylinder body (4), the other end of the horizontal cylinder body (11) is provided with the horizontal cylinder head (12), the horizontal diaphragm (15) is provided between the horizontal cylinder body (11) and the horizontal cylinder head (12), and a horizontal oil chamber (15) is provided in the horizontal cylinder body (11). 0), one end of the horizontal oil chamber (10) abuts against the piston head (6), and the other end of the horizontal oil chamber (10) acts on the oil chamber side of the horizontal diaphragm (15) through a pipeline; the horizontal cylinder head (12) is provided with a first air inlet (17) and a first air outlet (18) which are connected to the air chamber side of the horizontal diaphragm (15), the first air inlet (17) is provided with the first air inlet check valve (19), and the first air outlet (18) is provided with the first air outlet check valve (20).

7. A double-acting diaphragm compressor oil cylinder structure with a stuffing box seal according to claim 6, characterized in that: The vertical cylinder comprises a vertical cylinder body (13), a vertical cylinder head (14), a vertical diaphragm (16), a second intake check valve (23) and a second exhaust check valve (24); one end of the vertical cylinder body (13) is perpendicular to the axis of the piston rod (5) and is fixed to the oil cylinder body (4); the other end of the vertical cylinder body (13) is provided with the vertical cylinder head (14); the vertical diaphragm (16) is provided between the vertical cylinder body (13) and the vertical cylinder head (14); a vertical oil chamber (9) is provided in the vertical cylinder body (13); the vertical oil chamber (9) is provided in the vertical cylinder body (13); One end of the cavity (9) is connected to the oil cavity on the outer peripheral side of the piston rod (5), and the other end of the vertical oil cavity (9) acts on the oil cavity side of the vertical diaphragm (16) through a pipeline; the vertical cylinder head (14) is provided with a second air inlet (21) and a second air outlet (22) connected to the air cavity side of the vertical diaphragm (16), the second air inlet (21) is provided with the second air inlet check valve (23), and the second air outlet (22) is provided with the second air outlet check valve (24); the center line of the vertical cylinder and the center line of the horizontal cylinder are perpendicular to each other.

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