Electric pump with improved heater structure

Abstract

According to the electric pump with the improved heater structure, a heater comprises a hollow columnar heat conduction part and a heating part covering the heat conduction part, and a pump cavity is divided into a first flow channel close to the axis side and a second flow channel away from the axis side by the heater; the heating part comprises a first insulating layer adjacent to the surface of the heat conduction part, a second insulating layer far away from the peripheral surface of the heat conduction part, a conductor layer arranged between the first insulating layer and the second insulating layer and a resistance heating body, the resistance heating body comprises strip-shaped bodies arranged in rows, and the resistance of the conductor layer is smaller than that of the resistance heating body; and the resistor is arranged between the adjacent rows of resistor heating bodies and is used for communicating the adjacent rows of resistor heating bodies. According to the electric pump with the design, the risk of electric leakage of the heater can be effectively reduced while liquid is heated by fully utilizing the radial inner surface and the radial outer surface of the heater, and the use safety of the electric pump is improved while the heating efficiency of the electric pump is guaranteed.

Description

Technical Field

[0001] The invention relates to an electric pump with an improved heater structure, and its IPC classification number is F04D 13 / 06. Background Art

[0002] The existing pump with heating function is shown in patent publication number CN114060288B, which includes a heater arranged in the pump body cavity, and the heater divides the cavity into an inner peripheral flow channel and an outer peripheral flow channel for the pump liquid to pass through the heating. Because the radial inner and outer surfaces of the heater are in direct contact with the liquid in the cavity, the risk of leakage is prone to occur, so there is a need for improvement.

[0003] Except as otherwise specified, the common knowledge and terms involved in this specification refer to the "Mechanical Engineering Handbook" and "Electrical Engineering Handbook" published by the Machinery Industry Press, first edition in 1978-1983 and second edition in 1997, "New Edition of Motor Winding Repair" published by Shanghai Science and Technology Press, first edition in 1995, and patent document CN114060288B. Summary of the invention

[0004] In order to solve the problems described in the background technology, the present invention provides the following technical solutions:

[0005] An electric pump with an improved heater structure comprises a pump body, a pump cover and a heater located in a pump cavity surrounded by the pump body and the pump cover, wherein the heater comprises a hollow cylindrical heat-conducting portion and a heating portion covering the heat-conducting portion, which divides the pump cavity into a first flow channel close to the axis side and a second flow channel away from the axis side, the heating portion comprises a first insulating layer adjacent to the surface of the heat-conducting portion, a second insulating layer away from the outer peripheral surface of the heat-conducting portion, a conductor layer and a resistive heating element arranged between the first insulating layer and the second insulating layer, the resistive heating element comprises strips arranged in rows, the resistance of the conductor layer is smaller than the resistance of the resistive heating element, the conductor layer is arranged between the resistive heating elements in adjacent rows, and connects the resistive heating elements in adjacent rows.

[0006] The utility model provides an electric pump with an improved heater structure, in which adjacent rows of the heating elements of the heater are provided with a conductor layer connecting the heating elements in adjacent rows, thereby reducing the probability of electric leakage caused by excessive heat generated by the resistance heating elements at the row change points when the electric pump is working, thereby ensuring the heating efficiency of the electric pump while improving the safety of the electric pump.

[0007] Furthermore, the radial thickness of the resistance heating element and the conductor layer is 10-30 um.

[0008] Furthermore, the radial thickness of the first insulating layer and / or the second insulating layer is 100-200 um.

[0009] The more specific design and technical effects of the present invention are further explained in the specific implementation manner in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a three-dimensional structural schematic diagram of the electric pump of the utility model;

[0011] Figure 2 This is an axial cross-sectional view of the electric pump of the utility model;

[0012] Figure 3 It is a three-dimensional structural schematic diagram of the heater of the utility model;

[0013] Figure 4 It is a schematic diagram of the expanded structure of the heater of the utility model;

[0014] Figure 5 It is an axial cross-sectional view of the heater of the utility model;

[0015] Figure 6 yes Figure 5 A is a partial enlarged schematic diagram;

[0016] in:

[0017] 10-pump cavity, 11-first flow channel, 12-second flow channel, 100-pump body, 200-pump cover, 210-water inlet, 220-drain outlet, 300-heater, 310-heat conducting part, 320-heating part, 321-first insulating layer, 322-conductor layer, 323-resistance heating element, 324-second insulating layer, 400-stator assembly, 500-rotor assembly DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] The present invention discloses an electric pump with an improved heater structure. Figure 1 and Figure 2The electric pump comprises a pump body 100, a pump cover 200 having a water inlet 210 and a drain outlet 220, a heater 300 and a stator assembly 400 fixed on the pump body 100, and a rotor assembly 500 with an impeller rotatably mounted on the pump body 100, wherein the heater 300 is mounted in a pump cavity 10 surrounded by the pump body 100 and the pump cover 200, and the pump cavity 10 is divided into a first flow channel 11 close to the axis side and a second flow channel 12 away from the axis side. During operation, the liquid enters the first flow channel 11 from the water inlet 210, and the liquid is heated by the radial inner surface of the heater 300, and then the liquid in the first flow channel 11 flows into the second flow channel 12, and the liquid is heated by the radial outer surface of the heater 300, and finally the liquid in the second flow channel 12 is discharged through the drain outlet 220.

[0020] The structure and assembly of the stator assembly 400 and the rotor assembly 500 of the electric pump of the utility model are roughly the same as those of the electric pump of the background patent CN114060288B, and will not be repeated here. The improvement of the utility model is to optimize the design of the heater 300, see Figures 3 to 6The heater 300 of the utility model includes a hollow cylindrical heat-conducting part 310 and a heating part 320 covering the outer peripheral surface of the heat-conducting part 310, wherein the heating part 320 includes a first insulating layer 321 adjacent to the outer peripheral surface of the heat-conducting part 310, a second insulating layer 324 away from the outer peripheral surface of the heat-conducting part 310, and a resistive heating body 323 arranged between the first insulating layer 321 and the second insulating layer 324, and the resistive heating body 323 includes strips arranged in rows. In order to reduce the probability of leakage caused by damage to the first insulating layer and / or the second insulating layer due to excessive heat generation of the resistor heating element 323 at the line break when the electric pump is working (the resistor heating elements of the heater of the prior art electric pump are connected at the line break with the same material as the resistor heating elements, and connecting the resistor heating elements of adjacent rows will generate heat, resulting in the resistor heating elements of adjacent rows generating more heat at the line break than at other positions), the heater 300 of the electric pump of the utility model is further provided with a conductor layer 322 between the first insulating layer 321 and the second insulating layer 324, and the conductor layer 322 is arranged between the resistor heating elements 323 of adjacent rows and electrically connects the resistor heating elements 323 of adjacent rows, and at the same time, the resistance of the conductor layer 322 is less than the resistance of the resistor heating element 323. The first insulating layer 321 and the second insulating layer in the utility model are formed by sintering a dielectric slurry on the heat conducting part 310, and materials such as barium titanate, borosilicate, alumina ceramics and glass powder can be selected, which can play a good insulating role; the resistive heating element 323 is sintered between the first insulating layer 321 and the second insulating layer by using a resistive slurry, and conductive and heat-generating stable compound materials such as nickel, ruthenium dioxide, tungsten, etc. can be selected; the conductor layer 322 is sintered between the first insulating layer 321 and the second insulating layer by using an electrically conductive metal slurry, and metal materials with good conductive properties such as gold, silver, palladium, etc. can be selected, and silver is generally selected as the conductor layer.

[0021] The electric pump designed as above can effectively reduce the risk of excessive heat generation at the line break point causing damage to the first insulating layer and / or the second insulating layer and causing leakage by making full use of the radial inner and outer surfaces of the heater to heat the liquid, thereby ensuring the heating efficiency of the electric pump and improving the safety of the electric pump.

[0022] In this embodiment, the radial thickness of the resistance heating element 323 and the conductor layer 322 is preferably 10-30 um. Experiments show that the heat generated by the heating element 323 can meet the temperature rise requirements of the liquid pumped by the electric pump.

[0023] Preferably, experiments have shown that when the radial thickness of the first insulating layer 321 is 100-200um, it has a high thermal conductivity while taking into account the manufacturing cost. In addition, considering that the resistance heating element 323 generates too much heat at the line break, in order to further ensure the insulation reliability of the second insulating layer, the radial thickness of the second insulating layer is preferably 100-200um, so that both safety performance and manufacturing cost can be taken into account.

Claims

1. An electric pump with an improved heater structure, comprising a pump body (100), a pump cover (200) and a heater (300) located in a pump cavity (10) surrounded by the pump body and the pump cover, characterized in that: The heater (300) includes a hollow columnar heat-conducting portion (310) and a heating portion (320) covering the heat-conducting portion (310), which divides the pump chamber (10) into a first flow channel (11) close to the axis side and a second flow channel (12) away from the axis side. The heating portion (320) includes a first insulating layer (321) adjacent to the surface of the heat-conducting portion (310), a second insulating layer (324) away from the outer peripheral surface of the heat-conducting portion (310), a conductor layer (322) and a resistive heating element (323) arranged between the first insulating layer (321) and the second insulating layer (324). The resistive heating element (323) includes strips arranged in rows. The resistance of the conductor layer (322) is smaller than the resistance of the resistive heating element (323). The conductor layer (322) is arranged between the resistive heating elements (323) in adjacent rows and connects the resistive heating elements (323) in adjacent rows.

2. The electric pump with improved heater structure according to claim 1, characterized in that: The radial thickness of the resistance heating element (323) is 10-30 um.

3. The electric pump with improved heater structure according to claim 1 or 2, characterized in that: The radial thickness of the first insulating layer and / or the second insulating layer is 100-200 um.

Images