Aluminum shell liquid return connector

Abstract

The utility model discloses a liquid return connector with an aluminum shell. The liquid return connector comprises the shell, a pipe body, a set screw, a movable core, a steel ball, a valve seat assembly, an O-shaped ring, a spring, a spring check ring, a liquid inlet and a liquid outlet. The filter screen is inserted into the inner cavity of the shell; the fixing groove is formed in the filter screen; the fixing piece can be inserted into the fixing groove, and the filter screen is fixedly mounted at the liquid inlet; the acting piece is used for separating the fixing piece from the fixing groove and releasing the fixed installation of the filter screen; through the arrangement of the dismounting structure, the filter screen can be replaced only by pressing the pressing block, so that impurities are prevented from being accumulated at the filter screen for a long time, and the operation of the liquid return joint is kept; the shell made of 6061 aluminum alloy can resist urea liquid corrosion and has the advantages of being good in compression resistance, heat resistance and the like, the shape and the structure of the shell can be kept stable even if the shell is used for a long time, and fault and maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid transportation, in particular to a liquid return joint with an aluminum shell. Background Art

[0002] The urea pump is an important part of the urea solution injection metering system. Its main function is to extract the urea solution in the urea tank, maintain a certain pressure, and then transport it to the injection unit to meet the requirements of the injection metering system for flow and pressure. The urea pump is widely used as an important means to control diesel engine exhaust emissions and plays a significant role in improving environmental pollution caused by exhaust emissions. After using the SCR technology, the emission function of the engine depends to a large extent on the calibration of the urea injection system and the related performance of the urea pump. The urea pump is the core component of the SCR system, and its performance is closely related to the emission function of the engine.

[0003] For example, the Chinese utility model urea pump joint with the publication number CN216842177U uses a throttle hole for flow discharge and pressure maintenance, simplifies the internal structure of the urea pump, makes the overall structure of the urea pump simpler, saves the use of throttle elements, and reduces costs. However, such a structure still has the following several significant defects:

[0004] 1. The connection part is in interference fit with the joint body, and it is inconvenient to disassemble and assemble the filter screen. After using for a period of time, the filtered impurities will accumulate on one side of the filter screen, which will in turn affect the flow rate of the pipeline;

[0005] 2. The original plastic shell is easily corroded by urea solution during long-term use, resulting in poor joint sealing, urea solution leakage. Urea solution is prone to crystallization at low temperatures, and the plastic shell has poor heat resistance, unable to effectively prevent urea crystallization, easily causing blockage inside the urea pump. The plastic is prone to aging, and may deform or rupture after long-term use, affecting the sealing performance of the joint and the stability of the overall structure. Summary of the Invention

[0006] The utility model aims to solve one of the technical problems existing in the prior art.

[0007] The present application provides a liquid return joint with an aluminum shell, including a shell, a pipe body, a set screw, a moving core, a steel ball, a valve seat assembly, an O-ring, a spring, a spring retainer, a liquid inlet, and a liquid outlet;

[0008] It further includes:

[0009] A filter screen, which is inserted into the inner cavity of the shell;

[0010] A fixing groove, which is arranged on the filter screen;

[0011] A fixing member that can be inserted into the fixing groove to fixedly install the filter screen at the liquid inlet;

[0012] An acting member that is used to disengage the fixing member from the fixing groove and release the fixed installation of the filter screen.

[0013] The fixing member includes:

[0014] An installation cavity that is arranged inside the housing and communicates with the inner cavity of the housing;

[0015] A fixing block that is rotatably installed in the installation cavity through a rotating shaft;

[0016] A return spring, one end of which is fixedly connected to the inner wall of the installation cavity and the other end is fixedly connected to the fixing block.

[0017] The fixing block includes:

[0018] A pressure-receiving block, one end of which is movably connected to the rotating shaft;

[0019] A transmission block, one end of which is movably connected to the pressure-receiving block and the other end of the rotating shaft is fixedly connected;

[0020] A locking block, which is fixedly connected to the other end of the transmission block;

[0021] Wherein, the locking block can be inserted into the fixing groove, and the return spring is fixedly connected to the pressure-receiving block.

[0022] The acting member includes:

[0023] A pressing groove, which is arranged on the outer side surface of the housing and communicates with the installation cavity;

[0024] A pressing block, which is slidably installed in the pressing groove;

[0025] Wherein, the pressing block abuts against the pressure-receiving block.

[0026] It further includes:

[0027] A coincidence groove, which is arranged at the liquid inlet;

[0028] A coincidence block, which is fixedly connected to the upper end of the filter screen;

[0029] Wherein, the coincidence block can slide in the coincidence groove.

[0030] It further includes:

[0031] A pair of first sealing rings, which are fixedly connected to the filter screen;

[0032] A second sealing ring, which is fixedly connected to the inner cavity of the housing;

[0033] Among them, the second sealing ring is respectively in contact with a pair of the first sealing rings.

[0034] It further includes:

[0035] A buffer layer, which is arranged on the outer surfaces of a pair of the first sealing rings and the second sealing ring;

[0036] A corrosion-resistant layer, which is arranged on the outer surface of the buffer layer.

[0037] The corrosion-resistant layer is made of polyethylene.

[0038] The outer shell is made of 6061 aluminum alloy.

[0039] The beneficial effects of the present utility model are as follows:

[0040] 1. Through the setting of the disassembly and assembly structure, the operator only needs to press the pressing block to take out and replace the filter screen, avoiding the long-term accumulation of impurities on the filter screen, maintaining the efficient operation of the liquid return joint, reducing failures, extending the maintenance cycle and service life. Through the setting of the first sealing ring and the second sealing ring, it can prevent urea from flowing from the gap between the filter screen and the inner cavity of the outer shell to the valve seat assembly;

[0041] 2. By using the outer shell made of 6061 aluminum alloy, it can resist the corrosion of urea solution, and has good compressive, tensile, impact and heat resistance. Even after long-term use, it can maintain the stability of its shape and structure, ensure the sealing of the liquid return joint and the stability of the overall structure, thereby reducing failures and maintenance costs, and making the liquid return joint operate more stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic structural diagram of the liquid return joint with an aluminum outer shell in the embodiment of the present application;

[0043] Figure 2 It is a schematic internal structure diagram of the liquid return joint with an aluminum outer shell in the embodiment of the present application;

[0044] Figure 3 It is Figure 2 an enlarged structural diagram at A in

[0045] Figure 4 It is Figure 2 an enlarged structural diagram at B in

[0046] Figure 5 It is Figure 4 an enlarged structural diagram at C in

[0047] REFERENCE NUMERALS

[0048] 1 - Outer shell, 2 - Pipe body, 3 - Set screw, 4 - Moving core, 5 - Steel ball, 6 - Valve seat assembly, 7 - O-ring, 8 - Spring, 9 - Snap ring, 10 - Liquid inlet, 11 - Liquid outlet, 12 - Filter screen, 13 - Fixed groove, 14 - Fixing part, 141 - Installation cavity, 142 - Fixed block, 143 - Rotating shaft, 144 - Return spring, 145 - Compressed block, 146 - Transmission block, 147 - Locking block, 15 - Acting part, 151 - Pressing groove, 152 - Pressing block, 161 - Coincidence groove, 162 - Coincidence block, 171 - First sealing ring, 172 - Second sealing ring, 181 - Buffer layer, 182 - Corrosion-resistant layer. Specific embodiments

[0049] Next, the technical solutions in the embodiments of the present application will be clearly described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0050] The terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually of the same category, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally means an "or" relationship between the associated objects before and after.

[0051] Next, in conjunction with the accompanying drawings, the aluminum shell liquid return joint provided by the embodiments of the present application will be described in detail through specific embodiments and their application scenarios.

[0052] Embodiment 1:

[0053] As Figures 1 to 5 shown, the embodiment of the present application provides an aluminum shell liquid return joint, including an outer shell 1, a pipe body 2, a set screw 3, a moving core 4, a steel ball 5, a valve seat assembly 6, an O-ring 7, a spring 8, a snap ring 9, a liquid inlet 10, and a liquid outlet 11; it further includes a filter screen 12, which is inserted into the inner cavity of the outer shell 1; a fixed groove 13, which is arranged on the filter screen 12; a fixing part 14, which can be inserted into the fixed groove 13 to fixedly install the filter screen 12 at the liquid inlet 10; and an acting part 15, which is used to disengage the fixing part 14 from the fixed groove 13 to release the fixed installation of the filter screen 12.

[0054] Furthermore, the fixing member 14 includes an installation cavity 141 which is arranged inside the housing 1 and communicates with the inner cavity of the housing 1; a fixing block 142 which is rotatably installed in the installation cavity 141 through a rotating shaft 143; and a return spring 144, one end of which is fixedly connected to the inner wall of the installation cavity 141 and the other end of which is fixedly connected to the fixing block 142.

[0055] Furthermore, the fixing block 142 includes a pressure-receiving block 145, one end of which is movably connected to the rotating shaft 143; a transmission block 146, one end of which is movably connected to the pressure-receiving block 145 and the other end of which is fixedly connected to one end of the rotating shaft 143; and a locking block 147 which is fixedly connected to the other end of the transmission block 146. Wherein, the locking block 147 can be inserted into the fixing groove 13, and the return spring 144 is fixedly connected to the pressure-receiving block 145.

[0056] Furthermore, the acting member 15 includes a pressing groove 151 which is arranged on the outer side surface of the housing 1 and communicates with the installation cavity 141; and a pressing block 152 which is slidably installed in the pressing groove 151. Wherein, the pressing block 152 abuts against the pressure-receiving block 145.

[0057] Furthermore, it further includes a coincidence groove 161 which is arranged at the liquid inlet 10; and a coincidence block 162 which is fixedly connected to the upper end of the filter screen 12. Wherein, the coincidence block 162 can slide in the coincidence groove 161.

[0058] Furthermore, it further includes a pair of first sealing rings 171 which are fixedly connected to the filter screen 12; and a second sealing ring 172 which is fixedly connected to the inner cavity of the housing 1. Wherein, the second sealing ring 172 abuts against the pair of first sealing rings 171 respectively.

[0059] Furthermore, it further includes a buffer layer 181 which is arranged on the outer surfaces of the pair of first sealing rings 171 and the second sealing ring 172; and a corrosion-resistant layer 182 which is arranged on the outer surface of the buffer layer 181.

[0060] Furthermore, the corrosion-resistant layer 182 is made of polyethylene.

[0061] In this embodiment of the present application, due to the adoption of the above structure, the liquid inlet 10 of the liquid return joint is connected to an external pump body, and the liquid outlet 11 is connected to an external liquid storage tank. Urea enters the inner cavity of the liquid return joint from the liquid inlet 10 of the liquid return joint through an external pump body. A filter screen 12 is installed at the liquid inlet 10 through a fixing member 14. After the urea flows through the filter screen 12, impurities are filtered, and the cleanliness is high. Storing it in the external liquid storage tank is beneficial for subsequent use. A valve seat assembly 6 is installed in the inner cavity of the liquid return joint. A steel ball 5 is installed in the valve seat assembly 6. There is a certain distance between the valve seat assembly 6 and the filter screen 12. A set screw 3 is detachably installed at the liquid outlet 11 of the liquid return joint. A spring 8 is fixedly connected to one end of the set screw 3 facing the liquid inlet 10. The other end of the spring 8 is fixedly connected to a moving core 4. The moving core 4 is movably installed in the inner cavity. One end of the moving core 4 facing the liquid inlet 10 abuts against the steel ball 5. When the filtered urea flows through the valve seat assembly 6, the steel ball 5 will be pushed open and enter the external liquid storage tank from the liquid outlet 11. This structure can limit the flow direction of urea, so that urea can only flow from the external pump body to the external liquid storage tank and will not flow back from the external liquid storage tank to the external pump body, with high safety. A pipe body 2 is fixedly connected to one end of the set screw 3 facing the liquid inlet 10. A spring retaining ring 9 is arranged between the pipe body 2 and the set screw 3. The spring retaining ring 9 plays a sealing role;

[0062] When the filter screen 12 needs to be replaced, the operator can press the pressing block 152. The pressing block 152 slides inward and presses the pressed block 145. The pressed block 145 drives the transmission block 146 to rotate around the rotating shaft 143 and compresses the return spring 144. At this time, the locking block 147 disengages from the fixing groove 13, and the operator can take out the filter screen 12 from the liquid return joint. Align the overlapping block 162 on the new filter screen 12 with the overlapping groove 161 at the liquid inlet, and push the filter screen 12 until one end of the overlapping block 162 facing the liquid outlet 11 fits against the end face of the overlapping groove 161 close to the liquid outlet 11. At this time, release the external force applied to the pressing block 152. Under the action of the return spring 144, the pressed block 145 drives the transmission block 146 to rotate in the opposite direction around the rotating shaft 143, so that the locking block 147 is reinserted into the fixing groove 13, thus completing the replacement operation of the filter screen 12;

[0063] A pair of No. 1 sealing rings 171 are fixedly connected to the filter screen 12, and the No. 2 sealing ring 172 is fixedly connected in the inner cavity of the housing 1. After the filter screen 12 is installed, the No. 2 sealing ring 172 is located between the pair of No. 1 sealing rings 171 and squeezes the No. 1 sealing rings 171 on both sides, which is convenient for improving the sealing performance between the filter screen 12 and the inner cavity of the housing 1 and preventing urea from flowing to the valve seat assembly 6 through the gap between the filter screen 12 and the inner cavity of the housing 1. A buffer layer 181 is provided on the pair of No. 1 sealing rings 171 and the No. 2 sealing ring 172. The buffer layer 181 can evenly disperse the external pressure, avoid premature damage of the sealing ring caused by excessive local pressure, and improve the durability of the sealing ring. A corrosion-resistant layer 182 is provided on the buffer layer 181. The corrosion-resistant layer 182 is made of polyethylene. The polyethylene material has good corrosion resistance and anti-aging ability, and can protect the pair of No. 1 sealing rings 171 and the No. 2 sealing ring 172.

[0064] Embodiment 2:

[0065] As Figure 1 shown, in this embodiment, in addition to including the structural features of the foregoing embodiment, the housing 1 is made of 6061 aluminum alloy.

[0066] In this embodiment of the present application, due to the adoption of the above structure, the housing 1 is made of 6061 aluminum alloy. The aluminum housing 1 will generate an aluminum oxide film, which can resist the corrosion of urea solution and is not prone to poor sealing of the return liquid joint and leakage of urea solution. The return liquid joint can be used for a longer time and the work is more reliable. 6061 aluminum alloy has good thermal conductivity and thermal stability, and a high melting point. When heating the return liquid joint through an external heating device, it can effectively prevent the crystallization of urea at low temperature in the inner cavity, and the return liquid joint is not prone to deformation and aging in a high-temperature environment. 6061 aluminum alloy also has good compressive, tensile, and impact resistance capabilities, and can maintain its shape and structural stability even after long-term use, ensuring the sealing of the return liquid joint and the overall structural stability, thereby reducing the failure and maintenance costs and making the return liquid joint operate more stably.

[0067] It should be noted that in this text, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of this application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the reverse order according to the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0068] The embodiments of this application have been described above in conjunction with the accompanying drawings. However, this application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Those of ordinary skill in the art, under the inspiration of this application and without departing from the purpose of this application and the scope protected by the claims, can still make many forms, all of which fall within the protection scope of this application.

Claims

1. Aluminum shell liquid return joint, comprising a shell (1), a pipe body (2), a set screw (3), a moving core (4), a steel ball (5), a valve seat assembly (6), an O-ring (7), a spring (8), a spring retaining ring (9), a liquid inlet (10), and a liquid outlet (11), characterized in that, Further included are: A filter screen (12), which is inserted into the inner cavity of the housing (1); A fixing groove (13), which is arranged on the filter screen (12); A fixing member (14), which can be inserted into the fixing groove (13) to fixedly install the filter screen (12) at the liquid inlet (10); An acting member (15), which is used to disengage the fixing member (14) from the fixing groove (13) to release the fixed installation of the filter screen (12).

2. The liquid return joint of the aluminum shell according to claim 1, wherein The fixing member (14) includes: An installation cavity (141), which is arranged inside the housing (1) and communicates with the inner cavity of the housing (1); A fixing block (142), which is rotatably installed in the installation cavity (141) through a rotating shaft (143); A return spring (144), one end of which is fixedly connected to the inner wall of the installation cavity (141), and the other end is fixedly connected to the fixing block (142).

3. The liquid return joint of the aluminum shell according to claim 2, wherein The fixing block (142) includes: A pressure-receiving block (145), one end of which is movably connected to the rotating shaft (143); A transmission block (146), one end of which is movably connected to the pressure-receiving block (145), and the other end is fixedly connected to one end of the rotating shaft (143); A locking block (147), which is fixedly connected to the other end of the transmission block (146); Wherein, the locking block (147) can be inserted into the fixing groove (13), and the return spring (144) is fixedly connected to the pressure-receiving block (145).

4. The liquid return joint of the aluminum shell according to claim 3, characterized in that, The acting member (15) includes: A pressing groove (151), which is arranged on the outer side surface of the housing (1) and communicates with the installation cavity (141); A pressing block (152), which is slidably installed in the pressing groove (151); Wherein, the pressing block (152) abuts against the pressure-receiving block (145).

5. The liquid return joint of the aluminum shell according to claim 1, wherein Further included are: A coincidence groove (161), which is arranged at the liquid inlet (10); A coincidence block (162), which is fixedly connected to the upper end of the filter screen (12); Wherein, the coincidence block (162) can slide in the coincidence groove (161).

6. The aluminum housing liquid return joint according to claim 1, characterized in that, Further included are: A pair of first sealing rings (171), which are fixedly connected to the filter screen (12); A second sealing ring (172), which is fixedly connected to the inner cavity of the housing (1); Wherein, the second sealing ring (172) abuts against the pair of first sealing rings (171) respectively.

7. The liquid return joint of the aluminum shell according to claim 6, characterized in that, Further included are: A buffer layer (181), which is arranged on the outer surfaces of the pair of first sealing rings (171) and the second sealing ring (172); A corrosion-resistant layer (182), which is arranged on the outer surface of the buffer layer (181).

8. The liquid return joint of the aluminum shell according to claim 7, characterized in that, The corrosion-resistant layer (182) is made of polyethylene.

9. The liquid return joint of the aluminum shell according to claim 1, wherein, The housing (1) is made of 6061 aluminum alloy.

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