Urea pump assembly with frost crack prevention shell

Abstract

The utility model discloses a urea pump assembly with an anti-frost-crack shell, which comprises the shell, a water inlet pipe, a water outlet pipe and an electromagnetic valve, the water inlet pipe, the water outlet pipe and the electromagnetic valve are arranged in the shell, and elastic fillers are arranged in the water inlet pipe and the water outlet pipe. The device has the advantages of capability of automatically absorbing and expanding, low use difficulty, low application cost and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to urea pump technical field especially with the urea pump assembly of anti -freezing crack shell. BACKGROUND

[0002] The current internal combustion engine exhaust purification system, especially the lean-burn internal combustion engine, such as diesel engine exhaust purification needs to add a reaction agent, such as urea solution reaction agent (hereinafter referred to as "reaction agent"), in the exhaust system, i.e. aftertreatment device, to reduce nitrogen oxides (NOx). The national standard reaction agent is 32.5% urea solution. In engineering applications, the reaction agent is carried in the vehicle in a urea tank, and is extracted and injected into the aftertreatment device, such as the SCR system, under the control of the DCU (aftertreatment controller) according to the engine operating conditions of the vehicle. However, the above-mentioned national standard reaction agent will freeze at low temperatures, such as -11℃. Therefore, a heating system is needed to heat and thaw the reaction agent. The most common method is to use engine cooling water as a heating medium, hereinafter referred to as "circulating water", by arranging a heat exchanger, hereinafter referred to as "coil", in the urea tank, and introducing the circulating water into the coil for circulation; in this way, the heat from the engine is transmitted to the reaction agent to heat and thaw it. For example, the existing patent documents CN222066865U and CN216950529U.

[0003] Users use tap water to replace engine coolant (freezing point -35℃ to -45℃), and the circulating water flow channel of the urea pump is filled with water, so that the water retained in the urea pump freezes and expands, causing damage of varying degrees at multiple positions of the circulating water flow channel of the urea pump, resulting in product failure. Common damage includes:

[0004] Urea pump housing all process hole plug;

[0005] Filter heating triangular flow channel;

[0006] All combinations of the coil, urea pipe, wire pipe, liquid level sensor device and the shell;

[0007] Coil distortion.

[0008] The existing patent document CN222596160U discloses a device for preventing the freezing and cracking of a reaction agent heating system, which is arranged with at least one pressure release valve at the slowest cooling position of the coil and the flow channel connected thereto, which can release the pressure of the circulating water, i.e. the heating medium, in the coil and the flow channel, to avoid the freezing and cracking of the heating system (including the coil, the flow channel and other related parts) due to the freezing and volume expansion of the circulating water. This scheme needs to add at least one valve and further process the coil, which is costly.

[0009] The disclosure of the foregoing background art is only used to assist in understanding the ideas and technical solutions of the present application, and does not necessarily belong to the prior art of the present patent application. In the absence of explicit evidence that the above content has been disclosed on the filing date of the present patent application, the above background art should not be used to evaluate the novelty and inventiveness of the present application. Summary of the application

[0010] The present application is mainly aimed at providing a urea pump assembly which can automatically absorb expansion, has low difficulty in use and low application cost.

[0011] To this end, the present application provides a urea pump assembly with an anti-freezing shell.

[0012] Preferably, the present application can also have the following technical features:

[0013] The urea pump assembly with an anti-freezing shell comprises a shell, and a water inlet pipe, a water outlet pipe and an electromagnetic valve arranged on the shell, wherein the water inlet pipe and the water outlet pipe are provided with an elastic filler.

[0014] Further, the water inlet pipe and the water outlet pipe are pipe cavities opened in the shell.

[0015] Further, the elastic filler is tubular.

[0016] Further, the material of the elastic filler is a foamed silica gel pipe.

[0017] Further, the material of the elastic filler is an EPDM foamed material.

[0018] Further, it further comprises a second spring, and the inner cavity of the elastic filler is provided with the second spring.

[0019] Further, the length of the second spring is the same as or greater than the length of the elastic filler.

[0020] Further, a plurality of process water holes are also opened on the shell, and the elastic filler is arranged in the process water holes.

[0021] Further, the shell is also provided with a heated water filter screen mounting hole, and the heated water filter screen mounting hole is provided with the elastic filler.

[0022] The beneficial effects of the present application compared with the prior art include that the elastic filler has a certain compression amount, when the engine coolant is condensed into ice in the water inlet pipe and the water outlet pipe, the elastic filler provides space for the expansion of the ice-cooled liquid, thereby avoiding the joint of the water inlet pipe and the water outlet pipe from being cracked due to the expansion of the ice-cooled liquid. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 is a sectional view of the urea pump assembly of the utility model.

[0024] Fig. 2 is a schematic diagram of the elastic filler of the utility model.

[0025] Fig. 3 is a schematic diagram of the tubular elastic filler of the utility model, and the elastic filler of the embodiment is a circular tubular structure. DETAILED DESCRIPTION

[0026] The utility model will be further described in detail in combination with specific embodiments and by referring to the drawings. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope of the utility model and its applications.

[0027] Non-limiting and non-exclusive embodiments will be described with reference to the following drawings, in which the same reference numerals denote the same parts unless otherwise specifically indicated.

[0028] As Figs. 1-3 shown, the urea pump assembly with anti-freezing shell comprises a shell 29, and a water inlet pipe 24, a water outlet pipe 21, a heated water filter screen and a solenoid valve 27 arranged in the shell 29, and the structure of the urea pump assembly 2 is the disclosed structure, such as the structures of the urea pump assembly disclosed in the existing patent documents CN221921118U, CN215521215U, CN112855312B and the like. In the disclosed urea pump assembly scheme, the cavity in the urea pump assembly for conveying heated water (engine coolant) is full of heated water, and the heated water expands and freezes in a low-temperature environment, resulting in freezing and cracking of the cavity, joints and the like. The embodiment aims to solve the problem of pipe freezing and cracking on the basis of the disclosed urea pump assembly scheme. As an improvement, an elastic filler 30 is arranged in the water inlet pipe 24 and the water outlet pipe 21. The elastic filler 30 has a certain compression amount, and when the engine coolant condenses into ice in the water inlet pipe 24 and the water outlet pipe 21, the elastic filler 30 deforms to provide space for the expansion of the frozen coolant, thereby avoiding the expansion of the frozen coolant to crack the joints of the water inlet pipe 24 and the water outlet pipe 21. According to the prior art, the water inlet pipe 24 and the water outlet pipe 21 of the shell 29 are respectively provided with a water inlet joint 23 and a water outlet joint 22, and when the elastic filler 30 is installed, the elastic filler 30 is first installed in the water inlet pipe 24 and the water outlet pipe 21, and then the water inlet joint 23 and the water outlet joint 22 are installed. Specifically, the water inlet pipe 24 and the water outlet pipe 21 are pipe cavities formed in the shell 29. For example, the elastic filler 30 is applied to the urea pump with anti-blocking function disclosed in CN215521215U, thereby preventing the water inlet joint and the water outlet joint from being cracked by the expansion of the frozen coolant.

[0029] Generally, the housing 29 is also provided with several process holes for connecting the inlet and outlet water pipes, such as holes 25 and 26, and elastic filler 30 is provided in the process holes. The holes for installing the heated water filter screen are also provided. Elastic filler 30 is also installed inside 28.

[0030] Solenoid valve 27 is used to control the flow rate of heating water, so that the heating water channel is opened at low temperatures.

[0031] The elastic filler 30 is tubular, such as a cylindrical structure, and its material can be selected as foamed silicone tubing or EPDM foam material. Preferably, the inner cavity of the elastic filler 30 is provided with a second spring 31, the length of the second spring 31 being the same as the length of the elastic filler 30, or the length of the second spring 31 being greater than the length of the elastic filler 30. Different specifications of elastic fillers 30 are selected according to the application scenario, so that the outer side of the elastic filler 30 contacts the inner wall of the inlet / outlet pipe / process hole. The heated water mainly flows from the inner cavity of the elastic filler 30.

[0032] Preferably, the remaining cross-sectional area (including the inner cross-sectional area of ​​the elastic filler 30) of the inlet pipe 24 after filling with the elastic filler 30, and the remaining cross-sectional area (including the inner cross-sectional area of ​​the elastic filler 30) of the outlet pipe 21 after filling with the elastic filler 30, are both larger than the cross-sectional area at the valve port of the solenoid valve 27. More preferably, the inner cross-sectional area of ​​the tubular elastic filler 30 is larger than the cross-sectional area at the valve port of the solenoid valve 27. Since the remaining cross-sectional area of ​​each pipe (hole) after filling with the elastic filler 30 is larger than the cross-sectional area at the valve port of the solenoid valve 27, the overall flow rate will not be affected.

[0033] Those skilled in the art will recognize that numerous variations are possible with respect to the above description, and the embodiments and figures are merely for describing one or more specific implementations.

[0034] Although exemplary embodiments of the present invention have been described and illustrated, those skilled in the art will understand that various changes and substitutions can be made thereto without departing from the spirit of the present invention. Furthermore, many modifications can be made to adapt specific situations to the doctrine of the present invention without departing from the central concept of the present invention described herein. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but may include all embodiments and equivalents that fall within the scope of the present invention.

Claims

1. A urea pump assembly with anti-freezing cracking shell, comprising a shell, and a water inlet pipe, a water outlet pipe and a solenoid valve arranged in the shell, characterized in that, The water inlet pipe and the water outlet pipe are internally provided with elastic fillers.

2. The urea pump assembly having a freeze resistant housing of claim 1, wherein, The water inlet pipe and the water outlet pipe are pipe cavities opened in the shell.

3. The urea pump assembly having a freeze resistant housing of claim 1, wherein, The elastic filler is tubular.

4. The urea pump assembly having a freeze resistant housing of claim 3, wherein, The material of the elastic filler is a foamed silica gel pipe.

5. The urea pump assembly having a freeze resistant housing of claim 3, wherein, The material of the elastic filler is an EPDM foamed material.

6. The urea pump assembly having a freeze resistant housing of claim 3, wherein, A second spring is further included, and the inner cavity of the elastic filler is provided with the second spring.

7. The urea pump assembly having a freeze resistant housing of claim 6, wherein, The length of the second spring is the same as or greater than the length of the elastic filler.

8. The urea pump assembly having a freeze resistant housing of claim 1, wherein, A plurality of process water holes are further opened in the shell, and the process water holes are provided with the elastic fillers.

9. The urea pump assembly having a freeze resistant housing of claim 1, wherein, The shell is further provided with a heated water filter screen mounting hole, and the heated water filter screen mounting hole is provided with the elastic fillers.

10. The urea pump assembly having a freeze resistant housing of claim 1, wherein, After the water inlet pipe and the water outlet pipe are filled with the elastic fillers, the remaining cross-sectional area is greater than the cross-sectional area at the valve port of the electromagnetic valve.

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