A low stress reciprocating pump

Abstract

The present invention proposes a low-stress reciprocating pump, wherein a fuselage includes a thickened plate and a first connecting bolt penetrating through the thickened plate, and the front end of the first connecting bolt is fixedly connected to the pump body. Therefore, in the connection between the fuselage and the pump body, the stress is mainly borne by the fuselage, and the pump body is subjected to less stress and has a smaller stress-bearing area, thereby reducing the probability of cracking and damage to the pump body. The wall thickness of the thickened plate is thicker and stronger than that of other positions of the fuselage, so it can withstand greater stress and reduce the probability of cracking and damage to the fuselage; the fuselage includes a double vertical plate structure, and the box body is arranged in the double vertical plate structure and is clamped by a clamping flange, so that the box body is connected to the fuselage and the pump body as a whole, reducing the radial force and axial force on the box body, thereby reducing the probability of cracking and damage to the box body.

Description

Technical Field

[0001] The invention relates to the technical field of reciprocating pumps, and in particular to a low-stress reciprocating pump. Background Art

[0002] Reciprocating pumps have been widely used in various fields such as petroleum, chemical industry, and military industry. They are often used to transport various high-pressure liquids and gases. The reciprocating work of the crankshaft, connecting rod, and crosshead at the power end drives the plunger packing valve group at the hydraulic end to perform suction and discharge work to complete the pressurization of liquid and gas media.

[0003] During the reciprocating operation of the reciprocating pump, under the conditions of large pressure difference parameters and high speed, the stress between the pump body, fuselage and casing inside the reciprocating pump is relatively large, especially when the stress is concentrated in the fragile parts of the fuselage, the connection stress between the fuselage and the pump body is mainly borne by the pump body and the pump body has a large force-bearing area, and the stress of the parts around the casing is mainly borne by the casing. In this case, cracking of these three parts is more frequent, resulting in a higher frequency of damage to the reciprocating pump and a shorter service life. Summary of the invention

[0004] The problem to be solved by the present invention is to provide a reciprocating pump with small stress among a pump body, a fuselage and a casing, low damage frequency and long service life.

[0005] The technical solution adopted by the present invention to solve the above problems is: a low stress reciprocating pump, comprising a body and a pump body arranged at the output end of the body, wherein the body comprises at least one group of plunger assemblies reciprocating in the pump body,

[0006] The body includes thickened plates arranged on both sides, and first connecting bolts penetrating the thickened plates; the front end of the first connecting bolts is fixedly connected to the pump body so as to fix the body and the pump body and concentrate stress in the thickened plates;

[0007] It also includes a box body sleeved on the outside of the plunger assembly; the fuselage includes a double vertical plate structure arranged at the front end, and the box body is arranged in the double vertical plate structure to enable the box body to obtain radial positioning; the double vertical plate structure includes a clamping flange, one end of the box body is clamped by the clamping flange, and the other end is against the pump body to reduce the stress in the box body.

[0008] Compared with the prior art, the fuselage of the present invention includes a thickened plate and a first connecting bolt penetrating through the thickened plate, and the front end of the first connecting bolt is fixedly connected to the pump body. Therefore, in the connection between the fuselage and the pump body, the stress is mainly borne by the fuselage, and the pump body is subjected to less stress and has a smaller force-bearing area, thereby reducing the probability of cracking and damage to the pump body. The wall thickness of the thickened plate is thicker and stronger than that of other positions of the fuselage, so it can withstand greater stress and reduce the probability of cracking and damage to the fuselage; the fuselage includes a double vertical plate structure, and the box body is arranged in the double vertical plate structure and is clamped by a clamping flange, so that the box body is connected to the fuselage and the pump body as a whole, reducing the radial force and axial force on the box body, thereby reducing the probability of cracking and damage to the box body.

[0009] A low-stress reciprocating pump of the present invention further comprises a conical positioning sleeve; the conical positioning sleeve comprises a conical body arranged at the front end, and a conical hole is arranged at the rear end inside the pump body; the conical outer wall of the conical body fits with the conical inner wall of the conical hole to reduce the stress in the box body.

[0010] The present invention provides a low-stress reciprocating pump, wherein the thickened plate includes a first bolt hole penetrating the interior and a traction step arranged at one end away from the pump body; the first connecting bolt passes through the first bolt hole, and the rear end is fixedly connected to the traction step by a nut so as to tighten the pump body.

[0011] A low-stress reciprocating pump according to the present invention, wherein the double vertical plate structure comprises a first vertical plate fitted with the rear end surface of the pump body, a second vertical plate arranged behind the first vertical plate, and a second connecting bolt; the first vertical plate and the second vertical plate are both provided with corresponding positioning holes; the positioning holes cooperate with the outer side surface of the box body; the clamping flange, the first vertical plate and the second vertical plate are both provided with corresponding mounting holes, and the second connecting bolt connects the clamping flange, the first vertical plate, the second vertical plate and the pump body together through the mounting holes.

[0012] A low-stress reciprocating pump according to the present invention, wherein the casing includes casing steps respectively arranged at both ends; the rear end face of the pump body is provided with a first step hole, and the front end face of the clamping flange is provided with a second step hole; the casing step at the front end cooperates with the first step hole, and the casing step at the rear end cooperates with the second step hole.

[0013] A low-stress reciprocating pump according to the present invention, wherein the double vertical plate structure further includes an adjusting nut arranged in the clamping flange, the box body includes a box body filler arranged inside, and the conical positioning sleeve includes a tubular body arranged at the rear end; the tubular body and the adjusting nut are used to limit the position of the box body filler from the front and rear ends.

[0014] A low-stress reciprocating pump of the present invention, wherein the conical positioning sleeve includes a first channel, a second channel and a third channel which are sequentially arranged inside from front to back; a liquid inlet raft is provided in the first channel, and a liquid inlet spring is provided in the second channel; and the front end of the plunger assembly can be reciprocated in the first channel and the second channel.

[0015] A low-stress reciprocating pump of the present invention, wherein the pump body further includes a valve hole arranged at the front end of the interior; a combination valve is arranged in the valve hole, and a valve pressing sleeve is arranged at the front end of the combination valve; the combination valve and the valve pressing sleeve are used to cooperate with the liquid inlet raft to control the liquid outflow; and a front flange is arranged on the front end face of the pump body.

[0016] A low-stress reciprocating pump of the present invention, wherein the body further comprises a power end crankshaft, a connecting rod arranged on the power end crankshaft, and a piston structure matched with the connecting rod; the plunger assembly is connected to the piston structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 It is a detailed diagram of the cooperation between the thickened plate and the first connecting bolt;

[0019] Figure 3 A side half-section view of the present invention;

[0020] Figure 4 is a side sectional view of the present invention;

[0021] Figure 5 It is a schematic diagram of the matching of the tapered positioning sleeve;

[0022] Figure 6 The figure is a schematic diagram of the matching of the adjusting nut;

[0023] Figure 7 It is an enlarged view of the double vertical plate structure;

[0024] Figure 8 is a cross-sectional view of a tapered positioning sleeve;

[0025] Fig. 9 A side sectional view of the fuselage. DETAILED DESCRIPTION

[0026] Before describing in detail any embodiment of the present invention, it should be understood that the present invention is not limited in its application to the construction and arrangement details of the components described below or illustrated in the following figures. The present invention can have other embodiments and can be practiced or carried out in various ways. In addition, it should be understood that the words and terms used here are for descriptive purposes and should not be considered restrictive. The use of "including" or "having" and its variations herein is intended to cover the items and their equivalents and additional items displayed below. Unless otherwise specified or limited, the terms "install", "connect", "support" and "couple" and their variations are widely used and cover direct installation and indirect installation, connection, support and connection. In addition, "connect" and "couple" are not limited to physical or mechanical connections or connections.

[0027] Furthermore, on the first aspect, in the disclosure of the present invention, the orientation or positional relationship indicated by terms such as "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or positional relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore the above terms cannot be understood as limitations on the present invention; on the second aspect, the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" cannot be understood as a limitation on the quantity.

[0028] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

[0029] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0030] See also Figure 1-9 A low stress reciprocating pump comprises a body 1 and a pump body 2 arranged at the output end of the body 1, wherein the body 1 comprises at least one group of plunger assemblies 11 reciprocating in the pump body 2,

[0031] The body 1 includes thickened plates 12 disposed on both sides, and first connecting bolts 13 penetrating the thickened plates 12; the front end of the first connecting bolts 13 is fixedly connected to the pump body 2 so as to fix the body 1 and the pump body 2 and concentrate stress in the thickened plates 12;

[0032] It also includes a box body 3 sleeved on the outside of the plunger assembly 11; the fuselage 1 includes a double vertical plate structure 14 arranged at the front end, and the box body 3 is arranged in the double vertical plate structure 14 to enable the box body 3 to obtain radial positioning; the double vertical plate structure 14 includes a clamping flange 141, one end of the box body 3 is clamped by the clamping flange 141, and the other end is against the pump body 2 to reduce the stress in the box body 3.

[0033] In actual use, the fuselage 1 of the present invention includes a thickened plate 12 and a first connecting bolt 13 that penetrates the thickened plate 12. The front end of the first connecting bolt 13 is fixedly connected to the pump body 2. Therefore, in the connection between the fuselage 1 and the pump body 2, the stress is mainly borne by the fuselage 1, and the pump body 2 is subjected to less stress and has a smaller force-bearing area, thereby reducing the probability of cracking and damage of the pump body 2. The wall thickness of the thickened plate 12 is thicker and stronger than that of other positions of the fuselage 1, so it can withstand greater stress and reduce the probability of cracking and damage of the fuselage 1; the fuselage 1 includes a double vertical plate structure 14, and the box body 3 is arranged in the double vertical plate structure 14 and is clamped by a clamping flange 141, so that the box body 3 is connected to the fuselage 1 and the pump body 2 as a whole, reducing the radial force and axial force on the box body 3, thereby reducing the probability of cracking and damage of the box body 3.

[0034] Please continue reading Figure 4 , Figure 5 , Figure 8 , which also includes a tapered positioning sleeve 4; the tapered positioning sleeve 4 includes a tapered body 41 arranged at the front end, and a tapered hole 21 is provided at the rear end inside the pump body 2; the tapered outer wall of the tapered body 41 fits with the tapered inner wall of the tapered hole 21 to reduce the stress in the box body 3.

[0035] When in use, the design of the conical body 41 at the front end of the conical positioning sleeve 4 allows the conical outer wall of the conical body 41 to fit with the conical inner wall of the conical hole 21, thereby sharing the stress borne by the box body 3, the fuselage 1, and the pump body 2 during connection and operation, thereby reducing the probability of cracking and damage of the three.

[0036] Please continue reading Figure 1-3 , wherein the thickened plate 12 includes a first bolt hole 121 penetrating the interior and a force step 122 arranged at one end away from the pump body 2; the first connecting bolt 13 passes through the first bolt hole 121, and the rear end is fixedly connected to the force step 122 by a nut so as to tighten the pump body 2.

[0037] When in use, through the above design, the stress concentration point connecting the fuselage 1 and the pump body 2 can be set on the thickened plates 12 with higher strength on both sides, thereby protecting the fuselage 1 and the pump body 2.

[0038] It is worth mentioning that the specific connection method between the fuselage 1 and the pump body 2 is:

[0039] S1: threading on both sides of the rear end surface of the pump body 2;

[0040] S2: Pass the first connecting bolt 13 through the first bolt hole 121 and connect the front end to the pump body 2;

[0041] S3: a nut is arranged at the rear end of the first bolt hole 121, and the nut is closely matched with the force step 122;

[0042] S4: At least two groups of first connecting bolts 13 are arranged in each thickened plate 12.

[0043] Please continue reading Figure 4-7 The double vertical plate structure 14 includes a first vertical plate 142 that is in contact with the rear end surface of the pump body 2, a second vertical plate 143 arranged behind the first vertical plate 142, and a second connecting bolt 144; the first vertical plate 142 and the second vertical plate 143 are both provided with corresponding positioning holes 145; the positioning holes 145 are matched with the outer side surface of the box body 3; the clamping flange 141, the first vertical plate 142 and the second vertical plate 143 are all provided with corresponding mounting holes 146, and the second connecting bolt 144 connects the clamping flange 141, the first vertical plate 142, the second vertical plate 143 and the pump body 2 together through the mounting holes 146.

[0044] When in use, the box body 3 is connected to the pump body 2 by the clamping action of the clamping flange 141, and the second connecting bolt 144 passes through the mounting holes 146 in the clamping flange 141, the first vertical plate 142 and the second vertical plate 143 at one time, and is fixedly connected to the corresponding hole position in the pump body 2. Compared with directly arranging fasteners on the main body of the box body 3 to connect with the pump body 2, the use of the clamping flange 141 can make the radial force and axial force on the box body 3 smaller, thereby preventing the box body 3 from cracking; the positioning hole 145 cooperates with the outer side surface of the box body 3, so that the position of the box body 3 is more precise, and the outer wall of the box body 3 is wrapped by the positioning holes 145 in the first vertical plate 142 and the second vertical plate 143 arranged at the front and back, which limits the radial tension of the box body 3 from the front and back positions, further preventing the box body 3 from cracking.

[0045] It is worth mentioning that please refer to Figure 1 , Figure 4 According to the actual stress conditions, a plurality of second connecting bolts 144 can be evenly arranged around the box body 3 on the clamping flange 141; preferably, the second connecting bolts 144 are implemented as 4 or 6.

[0046] Please continue reading Figure 4-7, wherein the housing 3 includes housing steps 31 respectively arranged at both ends; the rear end face of the pump body 2 is provided with a first step hole 22, and the front end face of the clamping flange 141 is provided with a second step hole 1411; the housing step 31 at the front end cooperates with the first step hole 22, and the housing step 31 at the rear end cooperates with the second step hole 1411.

[0047] When in use, the two ends of the box body 3 are positioned by setting the box body steps 31 at the front and rear ends, and setting the first step hole 22 and the second step hole 1411. With the cooperation of the positioning hole 145, the positioning effect is better, and the box body steps 31 at both ends also have a sealing function.

[0048] Please continue reading Figure 4-7 , wherein the double vertical plate structure 14 further includes an adjusting nut 147 arranged in the clamping flange 141, the box body 3 includes a box body filler 32 arranged inside, and the conical positioning sleeve 4 includes a tubular body 42 arranged at the rear end; the tubular body 42 and the adjusting nut 147 are used to limit the position of the box body filler 32 from the front and rear ends.

[0049] When in use, the tubular body 42 and the adjusting nut 147 can serve as the front stop point and the rear stop point of the box filler 32 to fix the position of the box filler 32; in addition, the adjusting nut 147 is a hollow structure, in which a channel for the plunger assembly 11 to pass through is provided.

[0050] Please continue reading Figure 4-8 , wherein the conical positioning sleeve 4 includes a first channel 43, a second channel 44 and a third channel 45 which are sequentially arranged inside from front to back; a liquid inlet raft 431 is provided in the first channel, and a liquid inlet spring 441 is provided in the second channel 44; the front end of the plunger assembly 11 can be reciprocatedly arranged in the first channel 43 and the second channel 44.

[0051] When in use, the reciprocating motion of the plunger assembly 11 in the first channel 43 and the second channel 44 and the expansion and contraction of the liquid inlet spring 441 can drive the liquid inlet raft 431 to open or close the valve so that gas or liquid can enter the pump body 2.

[0052] Please continue reading Figure 4 The pump body 2 further includes a valve hole 23 arranged at the internal front end; a combination valve 24 is arranged in the valve hole 23, and a valve pressure sleeve 25 is arranged at the front end of the combination valve 24; the combination valve 24 and the valve pressure sleeve 25 are used to cooperate with the liquid inlet raft plate 431 to control the liquid outflow; the front end face of the pump body 2 is provided with a front flange 5.

[0053] During the reciprocating motion of the plunger assembly 11, the liquid inlet raft 431 is also in a repeated opening and closing state. When the liquid inlet raft 431 is opened, gas or liquid can enter the pump body 2 from the flow channel in the combination valve 24. When the liquid inlet raft 431 is closed, the flow channel in the combination valve 24 is closed, and gas or liquid cannot enter.

[0054] Please continue reading Figure 1 , Figure 3 , Fig. 9 , wherein the fuselage 1 further includes a power end crankshaft 15, a connecting rod 16 arranged on the power end crankshaft 15, and a piston structure 17 matched with the connecting rod 16; the plunger assembly 11 is connected to the piston structure 17.

[0055] When in use, the power end crankshaft 15 is used to be connected to an external power source and rotates under the drive of the power source. The connecting rod 16, driven by the power end crankshaft 15, converts the rotational motion of the power end crankshaft 15 into the reciprocating motion of the piston structure 17. The plunger assembly 11 realizes reciprocating motion under the drive of the piston structure 17, thereby pumping in gas or liquid.

[0056] Please continue reading Figure 1 , Fig. 9 In some embodiments, the plunger assembly 11 is implemented as multiple groups and connected to different positions of the power end crankshaft 15 through multiple groups of connecting rods 16 and piston structures 17, so that the plunger assembly 11 can perform work at each stage of the rotation of the power end crankshaft 15, making the pump efficiency of the present invention higher.

[0057] The above description is only for the best embodiment of the present invention, but it should not be understood as limiting the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to be changed. All changes made within the scope of protection of the independent claims of the present invention are within the scope of protection of the present invention.

Claims

1. A low stress reciprocating pump, comprising a body (1) and a pump body (2) arranged at an output end of the body (1), the body (1) comprising at least one set of plunger assemblies (11) reciprocating in the pump body (2), characterized in that: The body (1) comprises thickened plates (12) arranged on both sides, and first connecting bolts (13) penetrating the thickened plates (12); the front ends of the first connecting bolts (13) are fixedly connected to the pump body (2) so as to fix the body (1) and the pump body (2) and concentrate stress in the thickened plates (12); It also includes a housing (3) sleeved on the outside of the plunger assembly (11); the body (1) includes a double vertical plate structure (14) arranged at the front end, and the housing (3) is arranged in the double vertical plate structure (14) so ​​that the housing (3) can be radially positioned; the double vertical plate structure (14) includes a clamping flange (141), one end of the housing (3) is clamped by the clamping flange (141), and the other end is pressed against the pump body (2) so as to reduce the stress in the housing (3); It also includes a conical positioning sleeve (4); the conical positioning sleeve (4) includes a conical body (41) arranged at the front end, and a conical hole (21) is provided at the rear end inside the pump body (2); the conical outer wall of the conical body (41) fits with the conical inner wall of the conical hole (21) to reduce the stress in the housing (3); The double vertical plate structure (14) comprises a first vertical plate (142) which is in contact with the rear end surface of the pump body (2), a second vertical plate (143) arranged behind the first vertical plate (142), and a second connecting bolt (144); the first vertical plate (142) and the second vertical plate (143) are both provided with corresponding positioning holes (145); the positioning holes (145) are matched with the outer side surface of the housing (3); the clamping flange (141), the first vertical plate (142) and the second vertical plate (143) are both provided with corresponding mounting holes (146); the second connecting bolt (144) connects the clamping flange (141), the first vertical plate (142), the second vertical plate (143) and the pump body (2) together through the mounting holes (146).

2. The low stress reciprocating pump according to claim 1, characterized in that: The thickened plate (12) comprises a first bolt hole (121) extending therethrough, and a support step (122) disposed at an end away from the pump body (2); the first connecting bolt (13) passes through the first bolt hole (121), and a rear end is fixedly connected to the support step (122) via a nut, so as to tighten the pump body (2).

3. The low stress reciprocating pump according to claim 1, characterized in that: The housing (3) comprises housing steps (31) respectively arranged at both ends; the rear end surface of the pump body (2) is provided with a first step hole (22), and the front end surface of the clamping flange (141) is provided with a second step hole (1411); the housing step (31) at the front end cooperates with the first step hole (22), and the housing step (31) at the rear end cooperates with the second step hole (1411).

4. The low stress reciprocating pump according to claim 1, characterized in that: The double vertical plate structure (14) further comprises an adjusting nut (147) disposed in the clamping flange (141); the box body (3) comprises a box body filler (32) disposed inside; and the conical positioning sleeve (4) comprises a tubular body (42) disposed at the rear end; the tubular body (42) and the adjusting nut (147) are used to limit the position of the box body filler (32) from the front and rear ends.

5. The low stress reciprocating pump according to claim 1, characterized in that: The conical positioning sleeve (4) comprises a first channel (43), a second channel (44) and a third channel (45) which are arranged in sequence from front to back inside; a liquid inlet raft (431) is arranged in the first channel, and a liquid inlet spring (441) is arranged in the second channel (44); and the front end of the plunger assembly (11) can be reciprocatedly arranged in the first channel (43) and the second channel (44).

6. The low stress reciprocating pump according to claim 5, characterized in that: The pump body (2) further comprises a valve hole (23) arranged at the front end of the pump body (2); a combination valve (24) is arranged in the valve hole (23), and a valve pressing sleeve (25) is arranged at the front end of the combination valve (24); the combination valve (24) and the valve pressing sleeve (25) are used to cooperate with the liquid inlet raft (431) to control liquid discharge; and a front flange (5) is arranged on the front end surface of the pump body (2).

7. The low stress reciprocating pump according to claim 1, characterized in that: The body (1) further comprises a power end crankshaft (15), a connecting rod (16) disposed on the power end crankshaft (15), and a piston structure (17) matched with the connecting rod (16); the plunger assembly (11) is connected to the piston structure (17).

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