A urea pump filter cavity heating structure

Abstract

The present invention discloses a urea pump filter cavity heating structure, comprising a metal inner cavity, a plastic outer cavity and a heating unit, wherein the metal inner cavity is in a hollow cylindrical shape, and a limit step for mounting with a filter is arranged on the inner wall of the metal inner cavity, and a metal boss for fixing the heating unit is arranged on the outer wall of the metal inner cavity, and the plastic outer cavity is wrapped outside the metal inner cavity and fixed to the housing of the urea pump, and a window for exposing the heating unit is opened on the plastic outer cavity. The above-mentioned urea pump filter cavity heating structure retains the advantage of good thermal conductivity of metal through the metal inner cavity, reduces the energy consumption and requirements of the heating unit, and retains the characteristics of the plastic part through the plastic outer cavity, is convenient for injection molding, and provides thermal insulation function for the metal inner cavity, and the heating unit is not wrapped in the plastic part, which is conducive to early debugging and later maintenance, and has high overall integration, low cost, fast heat conduction, less heat loss, and high heating efficiency.

Description

Technical Field

[0001] The invention relates to the field of engine post-processing urea injection systems, and in particular to a urea pump filter cavity heating structure, which is used for low-temperature thawing of an icy solution in a urea pump filter cavity. Background Art

[0002] When the urea pump is not working in a low temperature environment, the residual liquid in the pump will freeze and block the flow channel, causing the pump to not work properly. At this time, a urea heating device is needed for low-temperature thawing. At the same time, in order to ensure that the components in the urea pump are not worn too quickly due to impurities mixed in the solution, a urea filter needs to be added to the urea pump body to improve the cleanliness of the urea. However, due to the relatively large volume of the urea filter, its cavity volume is large, and it is difficult to thaw quickly and make the pump normal when the urea solution freezes.

[0003] The existing urea pump filter cavity low-temperature thawing mainly uses integral injection molding, and the heating plate is embedded in the plastic shell for heating. However, the main problem is that plastics do not conduct heat as well as metal parts. The heating plate needs to be made larger and evenly distributed throughout the cavity, which is costly, has a general heating effect, and is not conducive to maintenance. Summary of the invention

[0004] Based on the above problems, the purpose of the present invention is to provide a urea pump filter cavity heating structure to solve the problems of difficulty in heating the existing urea pump filter cavity and high production cost.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A urea pump filter cavity heating structure comprises a metal inner cavity, a plastic outer cavity and a heating unit, wherein the metal inner cavity is in a hollow cylindrical shape, and a limiting step for mounting with the filter is arranged on the inner wall of the metal inner cavity, and a metal boss for fixing the heating unit is arranged on the outer wall of the metal inner cavity, and the plastic outer cavity is wrapped outside the metal inner cavity and fixed to the housing of the urea pump, and a window for exposing the heating unit is opened on the plastic outer cavity.

[0007] In particular, the plastic outer cavity is integrated with the housing of the urea pump through an injection molding process, and the metal inner cavity is embedded in the plastic outer cavity during the injection molding process, and the inner wall and the metal boss of the metal inner cavity are exposed.

[0008] Particularly, the heating unit is a heating sheet attached to the surface of the metal boss.

[0009] In particular, the top of the plastic outer cavity is open, and the side wall is provided with an inlet and outlet flow channel for the urea solution passing through the internal filter, and a pressure cover for tightly fixing the metal inner cavity and the filter is sealed at the opening.

[0010] In summary, the beneficial effects of the present invention are as follows: the urea pump filter cavity heating structure retains the advantage of good thermal conductivity of metal through the metal inner cavity, reduces the energy consumption and requirements of the heating unit, and retains the characteristics of the plastic part through the plastic outer cavity, which is convenient for injection molding and provides thermal insulation function for the metal inner cavity. In addition, the heating unit is not wrapped in the plastic part, which is conducive to early debugging and later maintenance. It has high overall integration, low cost, fast heat conduction, less heat loss, and high heating efficiency. It is a heating structure with feasible process, reliable structure and superior performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the use of the urea pump filter cavity heating structure provided by an embodiment of the present invention;

[0012] Figure 2 is a disassembled diagram of a urea pump filter cavity heating structure provided by an embodiment of the present invention;

[0013] Figure 3 It is a structural schematic diagram of a metal inner cavity in a urea pump filter cavity heating structure provided by an embodiment of the present invention;

[0014] Figure 4 It is a cross-sectional schematic diagram of a urea pump filter cavity heating structure provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0015] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar parts or parts having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0016] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, it can be a mechanical connection or an electrical connection, it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0017] In the description of the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0018] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0019] See also Figures 1 to 4 As shown, this preferred embodiment provides a urea pump filter cavity heating structure, including a metal inner cavity 1, a plastic outer cavity 2 and a heating unit 3.

[0020] The metal inner cavity 1 is in a hollow cylindrical shape, and a limiting step 6 for mounting with the filter 4 is provided on its inner wall, and a metal boss 7 for fixing the heating unit 3 is provided on its outer wall. The metal inner cavity 1 is preferably cast from a metal material with good thermal conductivity and easy processing, such as copper and aluminum, to ensure thermal conductivity and realize efficient heat exchange between the heating unit 3 and the filter 4 cavity.

[0021] The plastic outer cavity 2 is made of a high-strength plastic material and is integrated with the housing of the urea pump through an injection molding process. A window 8 is opened on the plastic outer cavity 2 to expose the heating unit 3, and the metal inner cavity 1 is embedded in the plastic outer cavity 2 during the injection molding process, exposing the inner wall of the metal inner cavity 1 and the metal boss 7.

[0022] Due to the good heat conduction and heat preservation ability, the heating unit 3 can be a heating plate attached to the surface of the metal boss 7. The heating plate directly acts on the metal inner cavity 1 to increase its heat transfer speed, thereby reducing the energy consumption of the heating unit 3.

[0023] In addition, the top of the plastic outer cavity 2 is open, and the side wall is provided with an inlet and outlet channel for the urea solution passing through the internal filter 4, so that the urea solution can be circulated and filtered, and a pressure cover 5 is sealed at the opening for tightly fixing the metal inner cavity 1 and the filter 4, thereby ensuring the sealing isolation of the urea solution cavity from the outside, the fixation of the metal inner cavity 1 and the penetration of the internal channel.

[0024] In summary, the above-mentioned urea pump filter cavity heating structure retains the advantage of good thermal conductivity of metal through the metal inner cavity, reduces the energy consumption and requirements of the heating unit, and retains the characteristics of plastic parts through the plastic outer cavity. It is convenient for injection molding and provides thermal insulation function for the metal inner cavity. In addition, the heating unit is not wrapped in plastic parts, which is conducive to early debugging and later maintenance. It has high overall integration, low cost, fast heat conduction, less heat loss, and high heating efficiency. It is a heating structure with feasible process, reliable structure and superior performance.

[0025] The above embodiments are only to illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above examples. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A urea pump filter cavity heating structure, It is characterized in that It comprises a metal inner cavity, a plastic outer cavity and a heating unit, wherein the metal inner cavity is in a hollow cylindrical shape, and a limiting step for mounting with a filter is arranged on the inner wall of the metal inner cavity, and a metal boss for fixing the heating unit is arranged on the outer wall of the metal inner cavity, and the plastic outer cavity is wrapped outside the metal inner cavity and fixed to the housing of the urea pump, and a window for exposing the heating unit is opened on the plastic outer cavity; The plastic outer cavity is integrated with the housing of the urea pump through an injection molding process, and the metal inner cavity is embedded in the plastic outer cavity during the injection molding process, and the inner wall and the metal boss of the metal inner cavity are exposed.

2. The urea pump filter cavity heating structure according to claim 1, Features: The heating unit is a heating sheet attached to the surface of the metal boss.

3. The urea pump filter cavity heating structure according to claim 1, Features: The top of the plastic outer cavity is open, and the side wall is provided with an inlet and outlet flow channel for urea solution passing through the internal filter. A pressure cover for tightly fixing the metal inner cavity and the filter is sealed at the opening.

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