A new type of low-temperature reciprocating pump with bidirectional liquid inflow

Abstract

A novel low-temperature reciprocating pump with bidirectional liquid inlet comprises a pump casing, a liquid outlet provided on the pump casing, a piston rod provided in the pump casing, a piston head connected to one end of the piston rod extending into the interior of the pump casing, a cylinder sleeve provided between the inner wall of the pump casing and the piston head, a reel portion for enclosing a liquid inlet cavity is provided on the outside of the pump casing, a rear through hole is provided on the pump casing, a mounting groove is provided in the piston head, a rear liquid inlet hole is provided on the piston head, a rear liquid inlet mechanism is provided in the mounting groove for sealing the notch of the mounting groove according to the moving state of the piston head, a forward liquid valve assembly is provided in the pump casing, and a liquid storage cavity is formed between the rear liquid inlet mechanism and the forward liquid valve assembly. The present invention can overcome the state of severe turbulence and gas-liquid mixing inside the pump cavity, avoid the phenomena of insufficient pump flow, emptying, slow pressurization, etc., improve the working efficiency of the pump, and reduce the loss of wearing parts.

Description

Technical Field

[0001] The invention relates to the technical field of fluid conveying equipment, in particular to a novel low-temperature reciprocating pump with bidirectional liquid inflow. Background Art

[0002] In the transportation of cryogenic liquids such as liquid oxygen, liquid nitrogen, liquefied natural gas, and liquid carbon dioxide, or in the transportation and pressurization of other media requiring gas-liquid separation, pumps are needed to drive the flow of fluids. Currently, reciprocating pumps are commonly used to transport cryogenic media in the market. Due to the cryogenic characteristics of the media, when the piston rod and piston reciprocate in the cylinder, the change in the volume behind the piston will cause severe turbulence and gas-liquid mixing inside the pump chamber. When the net boost head reaching the pump is insufficient or low, the pump's liquid intake efficiency is reduced, which can easily lead to abnormal phenomena such as insufficient pump flow, emptying, and slow pressurization. Summary of the Invention

[0003] The purpose of the present invention is to provide a new type of low-temperature reciprocating pump with bidirectional liquid inflow. The present invention solves the problem that when the net boost head of the existing low-temperature reciprocating pump is insufficient or low, the pump's liquid inflow efficiency is reduced, which easily causes abnormal phenomena such as insufficient pump flow, emptying, slow pressure increase, etc.

[0004] The technical solution of the present invention is: a new type of low-temperature reciprocating pump with bidirectional liquid inlet, comprising a pump casing, a liquid outlet provided on the pump casing, a piston rod provided in the pump casing, a piston head connected to one end of the piston rod extending into the interior of the pump casing, and a cylinder sleeve provided between the inner wall of the pump casing and the piston head. The outside of the pump casing is provided with a winding drum portion that cooperates with the pump casing to form a liquid inlet cavity. A rear through hole connecting the liquid inlet cavity and the interior of the pump casing is provided on the pump casing, a mounting groove is provided in the piston head, and a rear liquid inlet hole connecting the mounting groove and the interior of the pump casing is provided on the piston head. A rear liquid inlet mechanism for sealing the notch of the mounting groove according to the moving state of the piston head is provided in the mounting groove, a forward liquid valve assembly in the pump casing, and a liquid storage cavity connected to the liquid outlet is formed between the rear liquid inlet mechanism and the forward liquid valve assembly.

[0005] Preferably, the rear liquid inlet mechanism includes a rear liquid inlet valve body fixedly connected to the inner wall of the mounting groove near the notch of the mounting groove, a rear liquid inlet valve plate passing through the center of the rear liquid inlet valve body, a rear clamping nut provided at one end of the rear liquid inlet valve plate extending into the mounting groove, a rear compression spring connecting the rear clamping nut and the rear liquid inlet valve body, and a guide ring arranged along the outer wall of the piston head.

[0006] Preferably, the forward liquid valve assembly includes a forward liquid valve body fixedly connected to the inner wall of the pump casing, a forward liquid valve plate passing through the center of the forward liquid valve body, a front clamping nut arranged at one end of the forward liquid valve plate away from the liquid storage chamber, and a front compression spring connecting the front clamping nut and the forward liquid valve body.

[0007] Preferably, the reel portion includes an inner reel and an outer reel distributed in sequence from close to away from the pump casing, an end cover for sealing the inner reel and the outer reel to form the liquid inlet cavity, and a liquid inlet interface and an air return interface provided on the end cover.

[0008] Preferably, the inner drum and the outer drum are provided with shrinkage joints.

[0009] Preferably, the outer array of the pump casing is provided with a plurality of heat-absorbing fins.

[0010] Preferably, a sealing cavity is provided inside the pump housing corresponding to the surface of the piston rod, and the sealing cavity is filled with a sealing packing assembly.

[0011] Preferably, guide sleeves are provided on both sides of the piston rod corresponding to the sealing packing assembly.

[0012] Preferably, the liquid outlet is provided with a liquid outlet valve assembly, and the interior of the liquid outlet valve assembly is a floating valve structure.

[0013] The beneficial effects of the present invention are:

[0014] Compared with the prior art, the present invention has the following beneficial effects: low-temperature medium can enter the liquid storage chamber in both directions through the front liquid inlet valve assembly and the rear liquid inlet mechanism, which can overcome the severe turbulence and gas-liquid mixing state inside the pump chamber; the problem of insufficient or low net boost head reaching the pump is solved, which makes the liquid inlet more sufficient, avoids the phenomena of insufficient pump flow, emptying, slow pressurization, etc., improves the working efficiency of the pump, and reduces the loss of wearing parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention;

[0016] Figure 2 Schematic diagram of the rear liquid inlet mechanism;

[0017] Figure 3 Schematic diagram of the forward liquid valve assembly; DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the accompanying drawings using embodiments.

[0019] This specific embodiment is merely an explanation of the present invention and is not intended to limit the present invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed. However, as long as such modifications are within the scope of the claims of the present invention, they are protected by patent law.

[0020] Examples, such as Figure 1-3 As shown, a new type of low-temperature reciprocating pump with bidirectional liquid inlet comprises a pump housing 1, a liquid outlet 101 provided on the pump housing 1, a piston rod 2 provided in the pump housing 1, a piston head 4 connected to one end of the piston rod 2 extending into the interior of the pump housing 1, and a cylinder sleeve 5 provided between the inner wall of the pump housing 1 and the piston head 4. The outside of the pump housing 1 is provided with a reel portion 6 that cooperates with the pump housing 1 to enclose a liquid inlet cavity 102. The pump housing 1 is provided with a rear through hole 103 that communicates with the liquid inlet cavity 102 and the interior of the pump housing 1. The piston head 4 is connected to the inner wall of the pump housing 1 and the cylinder sleeve 5 is provided between the inner wall of the pump housing 1 and the piston head 4. A mounting groove 401 is provided inside, and a rear liquid inlet hole 402 connecting the mounting groove 401 and the inside of the pump housing 1 is provided on the piston head 4. A rear liquid inlet mechanism 7 is provided in the mounting groove 401 for sealing the notch of the mounting groove 401 according to the moving state of the piston head 4, and a forward liquid valve assembly 8 is provided in the pump housing 1. A liquid storage chamber 3 connected to the liquid outlet 101 is formed between the rear liquid inlet mechanism 7 and the forward liquid valve assembly 8. Preferably, the number of rear through holes 103 is ten, and they are evenly distributed on the pump housing 1.

[0021] Further, such as Figure 2 As shown, the rear liquid inlet mechanism 7 includes a rear liquid inlet valve body 701 fixedly connected to the inner wall of the mounting groove 401 near the notch of the mounting groove 401, a rear liquid inlet valve plate 702 penetrating the center of the rear liquid inlet valve body 701, a rear clamping nut 703 provided at one end of the rear liquid inlet valve plate 702 extending into the mounting groove 401, a rear compression spring 704 connecting the rear clamping nut 703 and the rear liquid inlet valve body 701, and a guide ring 705 provided along the outer wall of the piston head 4. The rear liquid inlet valve body 701 is connected to the mounting groove 401 by welding or screwing. The inner wall is fixedly connected. During one reciprocating motion of the piston rod, when it is pulled back, the interior of the cylinder liner 5 is briefly in a depressurized state. The low-temperature medium enters the mounting groove 401 of the piston head 4 through the rear through hole 103 and the rear liquid inlet hole 402. The rear compression spring 704 in the mounting groove 401 is compressed, and the rear liquid inlet valve plate 702 is separated from the sealing surface of the piston head 4. The low-temperature medium enters the liquid storage chamber 3 from the flow channel inside the rear liquid inlet valve body 701. When the piston rod is pressed back, the rear liquid inlet valve plate 702 contacts and seals with the sealing surface of the piston head 4, and the low-temperature medium is discharged from the liquid outlet valve assembly 10.

[0022] Further, such as Figure 3As shown, the forward liquid valve assembly 8 includes a forward liquid valve body 801 fixedly connected to the inner wall of the pump housing 1, a forward liquid valve plate 802 passing through the center of the forward liquid valve body 801, a front clamping nut 803 provided at one end of the forward liquid valve plate 802 away from the liquid storage chamber 3, and a front compression spring 804 connecting the front clamping nut 803 and the forward liquid valve body 801. The forward liquid valve body 801 is fixedly connected to the inner wall of the pump housing 1 by welding or screwing. During a reciprocating motion of the piston rod, when it is withdrawn, the interior of the cylinder sleeve 5 is temporarily in a depressurized state, the front compression spring 804 is compressed, and the forward liquid valve plate 802 is compressed. The sealing surface of the forward liquid valve body 801 is separated, and the low-temperature medium enters the liquid storage chamber 3 from the flow channel inside the forward liquid valve body 801. When the piston rod is pressed back, the forward liquid valve plate 802 contacts and seals the sealing surface of the forward liquid valve body 801, and the low-temperature medium is discharged from the liquid outlet valve assembly 10. The low-temperature medium can enter the liquid storage chamber 3 in both directions through the forward liquid valve assembly and the rear liquid inlet mechanism, which can overcome the state of severe turbulence and gas-liquid mixing inside the pump chamber; the problem of insufficient or low net boost head reaching the pump makes the liquid inlet more sufficient, which can avoid insufficient pump flow, emptying, slow pressurization and other phenomena, improve the working efficiency of the pump, and reduce the loss of wearing parts.

[0023] Further, such as Figure 1 As shown, the reel portion 6 includes an inner reel 601 and an outer reel 602 distributed in sequence from close to away from the pump housing 1, an end cover 603 for sealing the inner reel 601 and the outer reel 602 to form the liquid inlet chamber 102, and a liquid inlet interface 604 and a return air interface 605 provided on the end cover 603.

[0024] Furthermore, the inner drum 601 and the outer drum 602 are provided with a shrinkage joint 606 .

[0025] Furthermore, a plurality of heat-absorbing fins 104 are arranged in an array outside the pump housing 1 .

[0026] Furthermore, a sealing cavity 105 is provided inside the pump housing 1 corresponding to the surface of the piston rod 2 , and the sealing cavity 105 is filled with a sealing filler assembly 9 .

[0027] Furthermore, the piston rod 2 is provided with guide sleeves 11 on both sides corresponding to the sealing packing assembly 9, and a guide sleeve 11 is provided in front and behind the sealing packing assembly 9, so that the concentricity of the piston rod is maintained better during the reciprocating motion, making the sealing assembly more durable.

[0028] Furthermore, the liquid outlet 101 is provided with a liquid outlet valve assembly 10 , the interior of the liquid outlet valve assembly 10 is a floating valve structure, and the liquid outlet faces upward.

[0029] Working principle:

[0030] During normal use, the low-temperature medium enters the pump chamber from the liquid inlet interface 604 of the liquid inlet end cover 603, and the entrained gas returns to the storage tank from the return air interface 605. During one reciprocating motion of the piston rod, when it is withdrawn, the interior of the cylinder sleeve 5 is temporarily in a depressurized state, the front compression spring 804 is compressed, and the front liquid valve plate 802 is separated from the sealing surface of the front liquid valve body 801; the low-temperature medium enters the mounting groove 401 of the piston head 4 from the rear through hole 103, the rear compression spring 704 in the mounting groove 401 is compressed, and the rear liquid valve plate 70 2 is separated from the sealing surface of the piston head 4, and the low-temperature medium enters the liquid storage chamber 3 from the flow channels inside the rear liquid inlet valve body 701 and the front liquid inlet valve body 801; when the piston rod is pressed back, the rear liquid inlet valve plate 702 contacts and seals with the sealing surface of the piston head 4, and the front liquid valve plate 802 contacts and seals with the sealing surface of the front liquid valve body 801, and the low-temperature medium is discharged from the liquid outlet valve assembly 10; a guide sleeve 11 is provided at the front and rear of the sealing packing assembly 9, so that the concentricity of the piston rod is maintained well during the reciprocating motion, making the sealing assembly more durable.

[0031] The above describes in detail the specific embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art based on the concepts of the present invention through logical analysis, reasoning, or limited experimentation based on the prior art should be within the scope of protection defined by the present claims.

Claims

1. A novel low-temperature reciprocating pump with bidirectional liquid inlet, comprising a pump housing (1), a liquid outlet (101) provided on the pump housing (1), a piston rod (2) provided in the pump housing (1), a piston head (4) connected to one end of the piston rod (2) extending into the interior of the pump housing (1), and a cylinder sleeve (5) provided between the inner wall of the pump housing (1) and the piston head (4), characterized in that: The pump housing (1) is provided with a reel portion (6) on the outside thereof and cooperates with the pump housing (1) to enclose a liquid inlet cavity (102); the pump housing (1) is provided with a rear through hole (103) communicating with the liquid inlet cavity (102) and the interior of the pump housing (1); a mounting groove (401) is provided in the piston head (4); the piston head (4) is provided with a rear liquid inlet hole (402) communicating with the mounting groove (401) and the interior of the pump housing (1); a rear liquid inlet mechanism (7) for sealing the notch of the mounting groove (401) according to the moving state of the piston head (4) is provided in the mounting groove (401); a forward liquid valve assembly (8) is provided in the pump housing (1); a liquid storage cavity (3) communicating with the liquid outlet (101) is formed between the rear liquid inlet mechanism (7) and the forward liquid valve assembly (8); The rear liquid inlet mechanism (7) comprises a rear liquid inlet valve body (701) fixedly connected to the inner wall of the installation groove (401) near the notch of the installation groove (401), a rear liquid inlet valve plate (702) penetrating the center of the rear liquid inlet valve body (701), a rear retaining nut (703) provided at one end of the rear liquid inlet valve plate (702) extending into the installation groove (401), a rear compression spring (704) connecting the rear retaining nut (703) and the rear liquid inlet valve body (701), and a guide ring (705) provided along the outer wall of the piston head (4); The forward liquid valve assembly (8) comprises a forward liquid valve body (801) fixed to the inner wall of the pump housing (1), a forward liquid valve plate (802) penetrating the center of the forward liquid valve body (801), a front clamping nut (803) provided at one end of the forward liquid valve plate (802) away from the liquid storage chamber (3), and a front compression spring (804) connecting the front clamping nut (803) and the forward liquid valve body (801); The reel portion (6) comprises an inner reel (601) and an outer reel (602) sequentially distributed from close to far away from the pump housing (1), an end cover (603) for sealing the inner reel (601) and the outer reel (602) to form the liquid inlet cavity (102), and a liquid inlet interface (604) and an air return interface (605) provided on the end cover (603).

2. A novel bidirectional liquid-inlet cryogenic reciprocating pump according to claim 1, characterized in that: The inner reel (601) and the outer reel (602) are provided with a shrinkage joint (606).

3. A novel bidirectional liquid-inlet cryogenic reciprocating pump according to claim 1, characterized in that: The outer array of the pump housing (1) is provided with a plurality of heat-absorbing fins (104).

4. A novel bidirectional liquid-inlet cryogenic reciprocating pump according to claim 1, characterized in that: A sealing cavity (105) is provided inside the pump housing (1) corresponding to the surface of the piston rod (2), and the sealing cavity (105) is filled with a sealing filler assembly (9).

5. A novel bidirectional liquid-inlet cryogenic reciprocating pump according to claim 4, characterized in that: Guide sleeves (11) are provided on both sides of the piston rod (2) corresponding to the sealing packing assembly (9).

6. The novel bidirectional liquid-inlet cryogenic reciprocating pump according to claim 1, characterized in that: The liquid outlet (101) is provided with a liquid outlet valve assembly (10), and the interior of the liquid outlet valve assembly (10) is a floating valve structure.

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