Multi-power adjustable heat pump electric heater with reinforced supporting structure

Abstract

The utility model relates to an electric heating technology, and aims to provide a multi-power adjustable heat pump electric heater with a reinforced supporting structure. The product comprises a junction box, a connecting flange and a hollow sleeve which are sequentially arranged along the axial direction, and is provided with at least two groups of U-shaped electric heating pipes, in the sleeve, the straight pipe sections of all the electric heating pipes are fixedly installed at the same time through at least one disc type support; the outer edge of the disc type support is provided with a plurality of installation positions, and the straight pipe sections of the electric heating pipes are embedded into the corresponding installation positions respectively. The outer side edge of the disc type support is connected with the inner wall of the sleeve to jointly form a reinforced supporting structure. Under the impact of a high-flow-speed refrigerant medium, the disc type support does not move, displacement does not occur between the electric heating pipes and the support, stable reinforced supporting can be achieved, and noise generated by friction and vibration caused by loosening is avoided.

Description

Technical Field

[0001] The utility model relates to electric heating technology, in particular to a multi-power adjustable heat pump electric heater with a reinforced support structure. Background Art

[0002] Electric heaters using electric heating tubes are widely used in a wide variety of industrial production equipment. However, due to the varying heating requirements in different application scenarios, the detailed structures of electric heater products also vary greatly.

[0003] In heat pump air conditioners, electric heaters are used to heat the refrigerant. In addition to adjusting the heater's heating power based on the air conditioner's operating conditions, the overall noise level must be controlled to prevent vibration or noise caused by the refrigerant's flow. Heat pump heaters are typically 20-30 cm long and no wider than 10 cm. Due to their limited size, they lack the internal space required to accommodate additional accessories to meet the vibration and noise reduction requirements of conventional electric heaters.

[0004] Therefore, how to adopt a reasonable product structure to solve the problems of power adjustment and noise elimination in a limited space has become a difficult problem in the design of heat pump electric heaters. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies in the prior art and provide a multi-power adjustable heat pump electric heater with a reinforced support structure.

[0006] In order to solve the above technical problems, the solution adopted by the present invention is:

[0007] A multi-power adjustable heat pump electric heater with a reinforced support structure is provided, comprising a terminal box, a connecting flange, and a hollow sleeve arranged in sequence along the axial direction; the outer end of the hollow sleeve is closed, and a liquid inlet and a liquid outlet are provided on its side wall near both ends; at least two groups of U-shaped electric heating tubes are provided inside the hollow sleeve, and the electric heating tubes in the same group have the same shape and size and are arranged parallel to each other; based on the different lengths of the straight tube sections and the different spans of the arcs of the non-connection ends, the electric heating tubes of different groups are installed in a nested manner;

[0008] The wiring terminals of each electric heating tube pass through the connecting flange and extend into the inner cavity of the junction box, and are connected according to their groups; each group of electric heating tubes is connected to an external controller through a wire, and the controller adjusts the power of the electric heater by changing the number of groups of electric heating tubes connected;

[0009] Inside the hollow sleeve, at least one disc-type bracket is used to simultaneously fix and install the straight pipe sections of all electric heating tubes; the outer edge of the disc-type bracket has multiple installation positions, and the straight pipe sections of each electric heating tube are respectively embedded in the corresponding installation positions; the outer edge of the disc-type bracket is connected to the inner wall of the sleeve, together forming a reinforced support structure.

[0010] As an improved solution, the mounting position on the disc-type bracket is a groove, the inner bottom shape of which is an arc adapted to the straight section of the electric heating tube; or, the mounting position is a circular through hole, the inner diameter of which is adapted to the outer diameter of the straight section of the electric heating tube.

[0011] As an improved solution, the inner wall of the hollow sleeve is provided with an annularly arranged snap-fitting position, and the outer edge of the disc-shaped bracket is tightly embedded in the snap-fitting position.

[0012] As an improved solution, the straight tube section of the electric heating tube is tightly fitted to the mounting position on the disc-type bracket, and is reinforced and fixed by brazing.

[0013] As an improved solution, there are two groups of electric heating tubes, and the electric heating tubes between the two groups are arranged in a coaxial and vertical manner; the overall layout of each mounting position on the disc-type bracket is rectangular, and the straight pipe sections of the same group of electric heating tubes are respectively embedded in the mounting positions on the opposite sides of the rectangle.

[0014] As an improved solution, the junction box is an integrated structure of cast iron or cast aluminum, and its ends are provided with end covers with threaded connections; at least one explosion-proof cable gland for wiring is provided on the side of the junction box.

[0015] As an improved solution, the connecting flange has multiple through holes corresponding to the mounting positions on the disc-type bracket; the ends of the straight pipe sections of each electric heating tube pass through the through holes on the connecting flange and are fixed and sealed by welding.

[0016] As an improved solution, it also includes a tubular thermocouple arranged coaxially with the hollow sleeve, whose wiring end passes through the mounting hole on the connecting flange, and the non-wiring end passes through the mounting hole on the disc-type bracket or is fixed to the straight pipe section of a certain electric heating pipe with a clamp; at the mounting hole on the connecting flange, fixation and sealing are achieved by welding.

[0017] As an improved solution, a mounting plate is fixedly arranged along the axial direction of the outer side of the hollow sleeve, and the mounting plate has at least two mounting holes; the mounting plate is flat, and its root is fixed to the outer wall of the sleeve by welding; or, the cross-section of the mounting plate is L-shaped, and its bottom plate is welded to the outer wall of the sleeve.

[0018] As an improved solution, at the connection ends of the electric heating tubes in the same group, the star connection of the electric heating tubes in the group is achieved by connecting the same-side connection posts with L-shaped connection pieces.

[0019] Compared with the prior art, the technical effects of the present invention are:

[0020] 1. In the product of the present invention, the outer edge of the disc-type bracket is connected to the inner wall of the sleeve to form a reinforced support structure. The straight sections of each electric heating tube are adaptively installed in the mounting position on the disc-type bracket, and the external shape and size are adapted to the shape of the inner bottom of the groove or the circular through hole; therefore, even under the impact of high-flow refrigerant medium, the bracket itself will not move, and the electric heating tubes and the bracket will not be displaced relative to each other, which can achieve stable reinforced support and avoid noise caused by loosening, friction, and vibration.

[0021] 2. In this utility model, the electric heating tube and the bracket are further fixed by brazing at the installation position, which can further strengthen the fixing effect and prevent loosening after long-term operation. At the same time, it can also effectively prevent corrosion in the gap between the heating tube and the bracket, as well as external scratches caused by vibration.

[0022] 3. This new product utilizes different straight tube lengths and non-connection end arcs to allow for nested installation of different groups of heating tubes. This allows for the installation of multiple groups within a heat pump air conditioner's limited internal space. By controlling the heating power of each group by switching them on and off, refrigerant temperature can be more precisely controlled, ensuring more stable operation and smoother regulation of the air conditioner.

[0023] 4. The integrated cast iron or cast aluminum junction box and explosion-proof cable gland design can meet the explosion-proof performance requirements of the refrigerant operating environment. The ends are equipped with screw-on end caps to facilitate line connection and installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a heat pump electric heater in the utility model.

[0025] Figure 2 This is the structural layout of two groups of electric heating tubes. The right side shows the installation relationship of the electric heating tubes in the disc bracket.

[0026] Figure 3 for Figure 2 The right side view of the structure in the middle shows the wiring method of the terminal blocks in the same group.

[0027] Figure 4 Schematic diagram of a junction box with multiple cable glands.

[0028] The reference numerals are: junction box 1; connecting flange 2; hollow sleeve 3; cable gland 4; liquid inlet 5; liquid outlet 6; disc-type bracket 7; electric heating tube 8. DETAILED DESCRIPTION

[0029] The specific implementation of the present utility model is described in detail below with reference to the accompanying drawings.

[0030] like Figure 1 、 2 As shown, the multi-power adjustable heat pump electric heater with a reinforced support structure in the present invention includes a terminal box 1, a connecting flange 2 and a hollow sleeve 3 arranged in sequence along the axial direction. The outer end of the hollow sleeve 3 is closed, and a liquid inlet 5 and a liquid outlet 6 are respectively provided on its side wall near both ends. Inside the hollow sleeve 3, there are at least two groups of U-shaped electric heating tubes 8. The electric heating tubes 8 in the same group have the same shape and size and are arranged parallel to each other. Based on the different lengths of the straight pipe sections and the span differences of the non-connection end arcs, different groups of electric heating tubes 8 are installed in a nested manner, thereby realizing the installation of multiple groups of electric heating tubes in a heat pump electric heater with limited volume.

[0031] In this example, there are two groups of electric heating tubes 8, and the electric heating tubes between the two groups are arranged in a coaxial and vertical manner. The overall layout shape of each mounting position on the disc-type bracket 7 is rectangular (such as Figure 2 As shown on the right side, the straight pipe sections of the same group of electric heating tubes 8 are respectively embedded in the installation positions on the opposite sides of the rectangle. In order to save installation space as much as possible, the appropriate span difference is adjusted to make the rectangle rectangular. Obviously, by adjusting the length and arc span of the straight pipe section, as well as the arrangement of the installation positions, it is also possible to arrange three or even more groups of electric heating tubes 8. In this example, three adjustment options of 33% power, 67% power and full power are available. When the number of groups of electric heating tubes is greater, more detailed and precise power regulation can be achieved, but it will also lead to problems of complex structure and limited installation space. Designers of production enterprises can make choices according to actual needs during specific implementation.

[0032] like Figure 2 、 3 As shown, the wiring terminals of the electric heating tubes 8 pass through the connecting flange 2 and extend into the inner cavity of the terminal box 1, where they are connected in groups. Each group of electric heating tubes 8 is connected to an external controller via wires. The controller adjusts the power of the electric heaters by changing the number of groups of electric heating tubes connected. Optionally, the wiring terminals of the electric heating tubes 8 in the same group can be connected to the same-side terminal posts to achieve a star connection for the electric heating tubes within the group.

[0033] A disc-type bracket 7 is designed inside the hollow sleeve 3 to simultaneously fix and install the straight sections of all electric heating tubes 8. There are multiple mounting positions on the outer edge of the disc-type bracket 7, and the straight sections of each electric heating tube 8 are respectively embedded in the corresponding mounting positions. The mounting position can be an open groove with an arc-shaped inner bottom, or a circular through hole; the size of the groove or through hole should be adapted to the outer diameter of the straight section of the electric heating tube so that the two fit tightly. A further optimized solution is to achieve enhanced fixation by brazing to avoid loosening after long-term operation, prevent corrosion in the gap between the heating tube and the bracket, and prevent external scratches caused by vibration.

[0034] To further strengthen the connection, the outer edge of the disc-shaped bracket 7 can be optionally connected to the inner wall of the sleeve to form a reinforced support structure. A plurality of snap-fitting positions can be optionally arranged in an annular pattern on the inner wall of the hollow sleeve 3, and the outer edge of the disc-shaped bracket 7 can be tightly embedded in the snap-fitting positions during installation.

[0035] The junction box 1 is an integrated structure of cast iron or cast aluminum, with screwed end covers provided at its ends. A plurality of explosion-proof cable glands 4 for wiring are provided on the side of the junction box 1 .

[0036] The connecting flange 3 has a plurality of through holes corresponding to the mounting positions on the disc-type bracket 7; the ends of the straight pipe sections of the electric heating tubes 8 pass through the through holes on the connecting flange 3 and are fixed and sealed by welding.

[0037] In order to achieve precise temperature control, a tubular thermocouple is coaxially arranged in the hollow sleeve, and its terminal passes through the mounting hole on the connecting flange ( Figure 3 The thermocouple is located in the center of the connecting flange 3) and is fixed and sealed by welding at the mounting hole on the connecting flange. In order to achieve end fixation to avoid vibration or loosening caused by liquid flow impact, the non-connecting end of the thermocouple can be optionally passed through the mounting hole in the center of the disc bracket; or fixed to the straight pipe section of a certain electric heating pipe with a clamp. In order to obtain temperature change data of different areas in the hollow sleeve 3, it can also be done as follows Figure 1 As shown in , a mounting hole is provided at the end of the sleeve, and a temperature measuring element is inserted into the inner cavity from the mounting hole to obtain the temperature of the refrigerant medium at the liquid outlet 6, so as to achieve more accurate temperature control.

[0038] like Figure 1 As shown, to facilitate installation of the heat pump electric heater within the air conditioner mainframe, a mounting plate is fixedly mounted axially outside the hollow sleeve 3. The mounting plate has at least two mounting holes. The mounting plate can be flat, with its base welded to the outer wall of the sleeve. Alternatively, the mounting plate can be L-shaped in cross-section, with its base snugly welded to the outer wall of the sleeve.

[0039] Based on the above description, although the present invention has been disclosed with preferred embodiments, those skilled in the art can utilize the above-disclosed structures and technical contents to create equivalent embodiments without departing from the scope of the present invention. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention shall fall within the scope of the present invention.

Claims

1. A multi-power adjustable heat pump electric heater with a reinforced support structure, comprising a junction box, a connecting flange and a hollow sleeve arranged in sequence along the axial direction; characterized in that: The outer end of the hollow sleeve is closed, and a liquid inlet and a liquid outlet are provided on its side wall near both ends. At least two groups of U-shaped electric heating tubes are provided inside the hollow sleeve. The electric heating tubes in the same group have the same shape and size and are arranged parallel to each other. Based on the different lengths of the straight tube sections and the different spans of the non-connection end arcs, the electric heating tubes in different groups are installed in a nested manner. The wiring terminals of each electric heating tube pass through the connecting flange and extend into the inner cavity of the junction box, and are connected according to their groups; each group of electric heating tubes is connected to an external controller through a wire, and the controller adjusts the power of the electric heater by changing the number of groups of electric heating tubes connected; Inside the hollow sleeve, at least one disc-type bracket is used to simultaneously fix and install the straight pipe sections of all electric heating tubes; the outer edge of the disc-type bracket has multiple installation positions, and the straight pipe sections of each electric heating tube are respectively embedded in the corresponding installation positions; the outer edge of the disc-type bracket is connected to the inner wall of the sleeve, together forming a reinforced support structure.

2. The multi-power adjustable heat pump electric heater with a reinforced support structure according to claim 1, characterized in that: The mounting position on the disc-type bracket is a groove, the inner bottom shape of which is an arc adapted to the straight section of the electric heating pipe; or, the mounting position is a circular through hole, the inner diameter of which is adapted to the outer diameter of the straight section of the electric heating pipe.

3. The multi-power adjustable heat pump electric heater with a reinforced support structure according to claim 1, characterized in that: The inner wall of the hollow sleeve is provided with an annularly arranged clamping position, and the outer edge of the disc-shaped bracket is tightly embedded in the clamping position.

4. The multi-power adjustable heat pump electric heater with a reinforced support structure according to claim 1, characterized in that: The straight pipe section of the electric heating pipe is tightly fitted to the mounting position on the disc-type bracket and is reinforced and fixed by brazing.

5. The multi-power adjustable heat pump electric heater with a reinforced support structure according to claim 1, characterized in that: There are two groups of electric heating tubes, and the electric heating tubes between the two groups are arranged in a coaxial and vertical manner; the overall layout shape of each mounting position on the disc-type bracket is rectangular, and the straight pipe sections of the same group of electric heating tubes are respectively embedded in the mounting positions on opposite sides of the rectangle.

6. The multi-power adjustable heat pump electric heater with a reinforced support structure according to claim 1, characterized in that: The junction box is an integrated structure of cast iron or cast aluminum, and an end cap connected with a screw thread is provided at one end thereof; at least one explosion-proof gland for wiring is provided on the side of the junction box.

7. The multi-power adjustable heat pump electric heater with a reinforced support structure according to claim 1, characterized in that: The connecting flange is provided with a plurality of through holes corresponding to the mounting positions on the disc-type bracket; the ends of the straight pipe sections of each electric heating pipe pass through the through holes on the connecting flange and are fixed and sealed by welding.

8. The multi-power adjustable heat pump electric heater with a reinforced support structure according to claim 1, characterized in that: It also includes a rod-shaped thermocouple coaxially arranged with the hollow sleeve, the wiring end of which passes through the mounting hole on the connecting flange, and the non-wiring end passes through the mounting hole on the disc-type bracket or is fixed to the straight pipe section of a certain electric heating pipe with a clamp; at the mounting hole on the connecting flange, fixation and sealing are achieved by welding.

9. The multi-power adjustable heat pump electric heater with a reinforced support structure according to claim 1, characterized in that: On the outside of the hollow sleeve, a mounting plate is fixedly arranged along its axial direction, and the mounting plate has at least two mounting holes; the mounting plate is flat, and its root is fixed to the outer wall of the sleeve by welding; or, the cross-section of the mounting plate is L-shaped, and its bottom plate is welded to the outer wall of the sleeve.

10. The multi-power adjustable heat pump electric heater with a reinforced support structure according to claim 1, characterized in that: At the terminal ends of the electric heating tubes in the same group, the star connection of the electric heating tubes in the group is achieved by connecting the L-shaped terminal lugs to the terminal posts on the same side.

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