A thermal oil furnace

Abstract

The present invention provides a heat transfer oil furnace, which belongs to the technical field of heat storage heaters, and specifically comprises an oil storage shell and an electric heating pipe installed in the oil storage shell, wherein the oil storage shell is made of a heat insulating material, a spiral electric heating spiral pipe is installed on the inner wall of the oil storage shell, and a multifunctional cylinder is installed in a circular array inside the oil storage shell, and all the multifunctional cylinders are connected through a shunt pipe and a return oil pipe coaxially arranged in the oil storage shell, and the oil inlet end of the return oil pipe extends out of the end face of the oil storage shell, and at least one electric heating pipe is installed between each two adjacent shunt pipes; an electric heating pipe for heating the hot oil in the multifunctional cylinder is also coaxially installed in the multifunctional cylinder, and an oil drain valve is also provided on the multifunctional cylinder, and when the oil drain valve is opened, the hot oil in the multifunctional cylinder can enter the oil storage shell. The heat transfer oil furnace can supply hot oil at a given temperature at any time, and can flexibly adjust the heating stock of the heat transfer oil as needed.

Description

Technical Field

[0001] The invention relates to the technical field of heat storage heaters, and in particular to a thermal oil furnace. Background Art

[0002] The heat of the thermal oil furnace is generated and transmitted by the electric heating element immersed in the thermal oil. The thermal oil is used as the medium and a circulating pump is used to force the thermal oil to circulate in the liquid phase, transferring the heat to one or more heat-using equipment. After being unloaded by the heat equipment, the heat is returned to the heater through the circulating pump, where it absorbs heat and transfers it to the heat-using equipment. This cycle is repeated to achieve continuous heat transfer, increase the temperature of the heated object, and meet the heating process requirements.

[0003] Existing thermal oil furnaces basically contain hot oil in an oil storage shell, and a number of electric heating pipes parallel to each other are arranged in the oil storage shell. These densely packed electric heating pipes can quickly heat the thermal oil in the oil storage shell to the working temperature. However, in actual use, the temperature of the thermal oil returned from the external equipment is often relatively low. When it directly enters the oil storage shell, it contacts and fuses with the hot oil inside it, and then a strong heat exchange occurs, which may significantly reduce the temperature of the original high-temperature hot oil at the working temperature, so that the temperature of the thermal oil output by the thermal oil furnace at this time is actually not within the required range, or it needs to wait for a period of time before it can be used after heating, and it cannot provide heat at any time; moreover, due to the different equipment to be heated, the amount and temperature of the refluxed hot oil are different, so in different occasions, the cooling effect on the original hot oil after reflux is not constant, which makes it impossible to determine the time required to restore the working temperature, which is not conducive to the heating operation.

[0004] In addition, the existing thermal oil furnaces have a constant volume and are all independent single spaces. They cannot be flexibly adjusted for different heating occasions, resulting in a small heating demand and the need to heat all the hot oil to the required temperature. Or, because the heat capacity is too small, even a single full output cannot meet the heating demand. Summary of the invention

[0005] In view of the above introduction to the current state of the art, the purpose of the present invention is to provide a thermal oil furnace to better solve the technical problems in the prior art that the thermal oil furnace is affected by the reflux hot oil and cannot maintain a relatively stable heating temperature at any time, and the heating amount cannot be flexibly adjusted.

[0006] A heat-conducting oil furnace of the present invention comprises a heat storage component and an electric heating tube installed in the heat storage component, wherein the heat storage component comprises an oil storage shell, the oil storage shell is made of a heat-insulating material, a spiral electric heating spiral tube is installed on the inner wall of the oil storage shell, and multifunctional cylinders are installed in a circular array inside the oil storage shell, all the multifunctional cylinders are connected through a shunt pipe and an oil return pipe coaxially arranged in the oil storage shell, the oil inlet end of the oil return pipe extends out of the end face of the oil storage shell, and at least one electric heating tube is installed between every two adjacent shunt pipes;

[0007] An electric heating tube for heating the hot oil in the multifunctional cylinder is also coaxially installed in the multifunctional cylinder. The multifunctional cylinder is also provided with an oil drain valve. When the oil drain valve is opened, the hot oil in the multifunctional cylinder can enter the oil storage shell.

[0008] Furthermore, the oil drain valve includes a valve column with a roughly fan-shaped cross-section, and a strip valve hole with a fan-shaped cross-section is opened on the wall of the multifunctional cylinder. The valve column is located in the strip valve hole and can slide along the radial straight line of the multifunctional cylinder to open or close the strip valve hole.

[0009] Furthermore, it also includes a guide rod, one end of which is fixed to the outer wall of the electric heating tube, and the other end of which is axially slidably installed in the valve column to guide the valve column to slide along the radial straight line of the multifunctional cylinder.

[0010] Furthermore, both ends of the valve column extend out of the end surface of the multifunctional cylinder respectively, and slidably cooperate with the slide grooves provided on the inner walls of both ends of the oil storage shell to guide the valve column to slide along the radial straight line of the multifunctional cylinder.

[0011] Furthermore, a flat thread is provided at one end of the valve column, and a driving gear is coaxially rotatably installed on the end face of the oil storage shell. One end of the driving gear is located inside the oil storage shell, and is meshed with the flat threads on the end faces of all the valve columns to form a flat thread pair, so that when the gear of the driving gear located outside the end face of the oil storage shell is meshed with an external input gear, all the valve columns are synchronously driven to slide out / into the corresponding strip valve holes through the flat thread pair.

[0012] Furthermore, the oil storage shell is divided into two oil storage shells which are arranged in parallel with each other and are connected to each other;

[0013] It also includes a first oil delivery pipe section and a second oil delivery pipe section respectively connected to the oil inlet ends of the upper and lower oil return pipes, and the two oil delivery pipe sections are respectively connected to the two ends of a regulating valve body, and are not on the same side; the center of the inner cavity of the regulating valve body is provided with an oil inlet, and a sliding column is linearly slidably installed in the regulating valve body, and a Z-shaped flow channel hole is provided in the sliding column, and the two ports of the flow channel hole can be connected with the two oil delivery pipe sections respectively in succession during the sliding process of the sliding column;

[0014] A transition pipe is connected to one end of the regulating valve body, and the transition pipe is connected to a vertically arranged compression pipe. The bottom end of the compression pipe is inserted into the top of the multifunctional cylinder at the highest point in the lower oil storage shell, and a piston block is vertically slidably installed in the compression pipe. The piston block is elastically supported and installed by a supporting spring, and can carry the pre-injected pre-filled oil above the piston block. The pre-filled oil fills the channel connecting the piston block to the transition pipe.

[0015] Furthermore, a return spring is provided at the joint between the transition pipe and the regulating valve body, one end of the return spring is connected to the transition pipe, and the other end is connected to the end face of the sliding column, and in a non-working state, the return spring makes the sliding column located at the position where the lower end of the flow channel hole is connected to the second oil pipeline section;

[0016] Only after the multifunctional cylinder at the highest point is filled with heat transfer oil, the heat transfer oil continues to be input into the return oil pipe. Then, the heat transfer oil overflows the multifunctional cylinder and pushes the piston block upward, so that the pre-filled oil pushes the sliding column to move in the regulating valve body, thereby connecting the upper port of the flow channel hole with the first oil pipeline section, while the lower port of the flow channel hole and the interface of the second oil pipeline section are staggered with each other.

[0017] Furthermore, the oil storage shell is entirely installed in a cabinet, the interior of the cabinet is divided into an upper compartment and a lower compartment, the oil storage shell is installed in the upper compartment, an output pipe section for outputting heat transfer oil to an external device is installed on the upper part of the oil storage shell, a first valve is installed on the output pipe section, and a liquid level meter and a temperature detector are also installed on the oil storage shell;

[0018] A base is installed in the lower bin, an oil pump is installed on the left side of the base, a filter and a second valve are installed on the pipeline at the input end of the oil pump, and a sewage pipe extending downward is installed at the outlet end of the second valve.

[0019] Furthermore, a door panel is provided on one side of the cabinet, and the door panel is directly opposite to the end of the oil storage housing where the oil inlet end of the oil return pipe is located.

[0020] Beneficial effects: The present invention adopts a method in which the hot oil refluxed from the equipment to be heated enters the multifunctional cylinder separately to heat it and raise its temperature to the working temperature, thereby avoiding direct injection into the heat transfer oil in the oil storage shell that has reached the working temperature, thereby avoiding the situation of cooling down this part of the heat transfer oil at the working temperature, and ensuring that the heat transfer oil inside the heat transfer oil furnace is always within the working temperature range to be output, and the heat supply is timely; and when necessary, the multifunctional cylinder is in the oil storage shell and can be directly used as pre-added hot oil for heating, which is suitable for occasions where a small amount of oil is used; or the valve holes of all the multifunctional cylinders are opened to connect with the space of the oil storage shell, thereby greatly improving the hot oil capacity for large-scale heating occasions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The following are auxiliary illustrations for explaining some specific embodiments of the present invention. The drawings described are mainly the principles of the specific operation execution structures or methods of some embodiments of the present invention. However, this does not mean that the physical structure or operation steps of the present invention can only be as shown in the drawings.

[0022] Figure 1 It is an overall structural layout diagram of the present invention;

[0023] Figure 2 It is a cross-sectional view of the oil storage housing;

[0024] Figure 3 is an enlarged cross-sectional view of the multifunctional cylinder;

[0025] Figure 4 It is a structural diagram when the valve column opens the strip valve hole;

[0026] Figure 5 It is a connection diagram between the valve column and the guide rod;

[0027] Figure 6 It is a schematic diagram of the installation at a multifunctional cylinder in the oil storage housing;

[0028] Figure 7 yes Figure 6 In the structure shown, a schematic diagram of the valve column in the oil storage housing opening the strip valve hole;

[0029] Figure 8 It is another installation schematic diagram of a multifunctional cylinder in the oil storage housing;

[0030] Fig. 9 It is a schematic diagram of the driving gear;

[0031] Fig.10 This is a connection diagram when two oil storage housings are arranged one above the other;

[0032] Fig.11 This is a schematic diagram of the lower oil return pipe being connected to the oil inlet;

[0033] Fig.12 This is a schematic diagram of the upper oil return pipe being connected to the oil inlet;

[0034] Fig.13 It is a schematic diagram of the internal structure of a compression tube.

[0035] In the figure, an oil storage shell 1, an electric heating spiral tube 2, a multifunctional tube 3, an electric heating tube 4, a valve column 5, a shunt pipe 6, an oil return pipe 7, a driving gear 8, a terminal 9, a spare pipe 10, a guide rod 11, a strip valve hole 12, a regulating valve body 13, a sliding column 14, an oil inlet 15, a flow channel hole 16, a first oil pipeline section 17, a second oil pipeline section 18, a transition pipe 19, a compression pipe 20, a piston block 21, a supporting spring 22, a liquid level gauge 23, a first valve 24, a cabinet 25, a base 26, an oil pump 27, a second valve 28, a sewage pipe 29, and a door panel 30 are shown. DETAILED DESCRIPTION

[0036] The embodiments of the present invention will be fully described below, and some core features of the embodiments will be specifically shown in the accompanying drawings, wherein the same or similar reference numerals in the drawings represent the same or similar technical features, or structures or steps or processes with similar functions. Other embodiments replaced by ordinary technicians based on these embodiments without the need for creative work also belong to the protection scope of the present invention.

[0037] See also Figure 1-2 As shown in the structure, the thermal oil furnace in this embodiment includes a heat storage component for storing heat. After the heat storage component outputs the internal heat to the outside, it can provide heat to the external object to be heated. Like the prior art, its heat storage component also includes an oil storage shell 1 and an electric heating pipe 4 installed in the oil storage shell 1. The difference is that, among them, the oil storage shell 1 used by the heat storage component in this embodiment is cylindrical. Of course, the oil storage shell 1 is made of insulation material. When it is specifically made, it can be directly made of insulation material as a whole, or it can be coated with insulation layer on the inner wall and outer wall to avoid internal heat loss and affect the heating efficiency of the thermal oil. And, correspondingly, a spiral electric heating spiral tube 2 is installed on the inner wall of the oil storage shell 1. The electric heating spiral tube 2 is fixedly installed in the oil storage shell 1 along the axial direction of the oil storage shell 1. At the same time, a number of multifunctional cylinders 3 are fixedly installed in a circular array inside the oil storage shell 1. An electric heating tube 4 for heating the hot oil in the multifunctional cylinder 3 is also coaxially installed in the multifunctional cylinder 3. The multifunctional cylinder 3 is also provided with an oil drain valve. When the oil drain valve is opened, the hot oil in the multifunctional cylinder 3 can enter the oil storage shell 1.

[0038] In the above structural design, the multifunctional cylinder 3 is called a heat-insulating cylinder or a heat-conducting cylinder because it can be designed as an insulating cylinder or a heat-conducting cylinder according to needs. As an insulating cylinder, it can fully isolate the heat conduction between the external hot oil and independently bear the heating power of the internal electric heating tube 4. As a heat-conducting cylinder, it can transfer the heat of the electric heating tube 4 to the external hot oil and coordinate heating with the electric heating spiral tube 2. Specifically, this multifunctional cylinder 3 is arranged axially parallel to the oil storage shell 1. All multifunctional cylinders 3 are connected to a return oil pipe 7 coaxially arranged in the oil storage shell 1 through at least one corresponding shunt pipe 6. The oil inlet end of the return oil pipe 7 extends out of the end face of the oil storage shell 1 so as to connect the hot oil returned from the external equipment to be heated and then distribute it to each multifunctional cylinder 3. At the same time, at least one electric heating tube 4 is installed between each two adjacent shunt pipes 6 to increase the heating speed of the heat-conducting oil in the liquid storage shell. For ease of use, the connecting terminals 9 of the electric heating tube 4 can be connected to realize power supply and corresponding additional signal detection, etc., and a spare tube 10 can be connected to the end of each multifunctional tube 3 to realize the injection or output of corresponding hot oil or other media into the interior separately, or when necessary, the spare tube 10 can be connected through an additional pump during use to transport the oil stored in the multifunctional tube 3 to the oil storage shell 1 or other external buffer containers.

[0039] In more detail, when the multifunctional cylinder 3 is selected as an insulation cylinder, when the heat-conducting oil flows back from the external device to the heat-conducting furnace, it can directly enter the insulation cylinder first, so as to avoid heat exchange with the hot oil in the oil storage shell 1 with a relatively stable temperature, thereby preventing the heat-conducting oil that is already in the state of use from cooling down due to the reflux of the hot oil, and quickly and independently heating it to the temperature in the use state in the multifunctional cylinder 3 as an insulation cylinder, and then flowing into the oil storage shell 1 for standby. When the multifunctional cylinder 3 is selected as a heat-conducting cylinder, it can be pre-injected with a special oil with a high specific heat capacity through the return oil pipe 7, and after being quickly heated by the electric heating pipe 4, it is transferred to the surrounding heat-conducting oil through the heat-conducting pipe, which is equivalent to expanding the direct contact volume of the heat source. Or when a larger amount of hot oil is needed, the heat-conducting oil directly fills the entire oil storage shell 1 and all the heat-conducting cylinders, so that the oil storage shell 1 and the internal space of the heat-conducting cylinder are connected as one, and the heat-conducting oil contained is melted and heated together, thereby increasing the amount of heat-conducting oil. Of course, the above are only some specific implementation scenarios, and those skilled in the art can adaptably expand to other occasions or other operating modes based on this design.

[0040] like Figure 2-4 As shown, the oil drain valve in this embodiment specifically includes a valve column 5 with a substantially fan-shaped cross section, a strip valve hole 12 with a fan-shaped cross section is opened on the wall of the multifunctional cylinder 3, and the valve column 5 is located in the strip valve hole 12, which can completely close the strip valve hole 12 and can slide along the radial straight line of the multifunctional cylinder 3 so as to Figure 3Open the strip valve hole 12 as shown, or Figure 4 As shown, the strip valve hole 12 is closed.

[0041] In order to guide the valve rod 5 to slide, this embodiment also includes the following Figure 3-4 as well as Figure 5 The guide rod 11 shown in the figure may be one or more guide rods, one end of which is fixed to the outer wall of the electric heating tube 4, and the other end is axially slidably installed in the valve column 5 to guide the valve column 5 to slide along the radial straight line of the multifunctional cylinder 3 to accurately open and close the strip valve hole 12. Figure 6-7 The two ends of the valve column 5 extend out of the end surface of the multifunctional cylinder 3 respectively, and slide in cooperation with the slide grooves provided on the inner walls of the two ends of the oil storage shell 1 to guide the valve column 5 to slide along the radial straight line of the multifunctional cylinder 3. This structure can replace the guiding function formed by the above-mentioned guide rod 11.

[0042] In order to drive all valve rods 5 to synchronously open and close their respective strip valve holes 12, one end of the valve rod 5 is provided with a flat thread, and a threaded rod is coaxially rotatably mounted on the end surface of the oil storage housing 1. Fig. 9 The driving gear 8 shown in the figure is installed as Figure 6-8 One end of the driving gear 8 is located inside the oil storage housing 1 and meshes with the plane threads on the end faces of all valve posts 5, thereby forming a synchronous transmission mechanism of the plane thread pair, so that when the gear of the driving gear 8 located outside the end face of the oil storage housing 1 meshes with an external input gear (not shown in the figure), all valve posts 5 are synchronously driven to slide out / into the corresponding strip valve holes 12 through the plane thread pair, and then the strip valve holes 12 are opened or closed. The above input gear can be driven by a micro motor.

[0043] In order to increase the capacity of thermal oil and make heat conduction more flexible, such as Figure 1 The oil storage housing 1 is divided into two upper and lower parallel oil storage housings 1, and the two oil storage housings 1 are connected to each other. The specific connection method can be designed adaptively. Figure 1 and Fig.10 In this embodiment, the first oil delivery pipe section 17 and the second oil delivery pipe section 18 are respectively connected to the oil inlet ends of the upper and lower oil return pipes 7. The two oil delivery pipe sections are respectively connected to the two ends of a control valve body 13 and are not on the same side, that is, in terms of the upper and lower positions, one is located on the upper side and the other is located on the lower side. Fig.11 There is an oil inlet 15 in the center of the inner cavity of the regulating valve body 13, and a sliding column 14 is linearly slidably installed in the regulating valve body 13. The sliding column 14 has a Z-shaped flow channel hole 16. The two ports of the flow channel hole 16 can be connected with the two oil pipeline sections in succession during the sliding process of the sliding column 14, that is, when the sliding column 14 moves, it is connected with the two oil pipeline sections in turn, and then returns oil to the upper and lower return oil pipes 7 at different times.

[0044] Among them, Fig.10 As shown, a transition pipe 19 is connected to one end of the regulating valve body 13, and the transition pipe 19 is connected to a vertically arranged compression pipe 20, and the bottom end of the compression pipe 20 is inserted above the multifunctional cylinder 3 at the highest point in the lower oil storage shell 1. The reason why it is at the highest point is that all the multifunctional cylinders 3 form a huge connected container. When there is oil at the highest point, it means that the multifunctional cylinders 3 at other places are already filled with refluxed hot oil. More specifically, as Fig.13 A piston block 21 is vertically and slidably installed in the compression tube 20. The piston block 21 is elastically supported and installed by a supporting spring 22. The supporting spring 22 is fixed on the inner wall of the compression tube 20 and can carry the pre-injected pre-filled oil above the piston block 21. The pre-filled oil fills the channel between the piston block 21 and the transition tube 19 that is connected to each other, so that when the piston block 21 moves up, it pushes the pre-filled oil to move.

[0045] Based on the above structural design, Fig.12 As shown, a return spring (the reference numeral is not shown in the figure) is provided at the joint of the transition pipe 19 and the regulating valve body 13, one end of the return spring is connected to the transition pipe 19, and the other end is connected to the end face of the sliding column 14, and in the non-working state, the return spring makes the sliding column 14 located at the position where the lower end of the flow channel hole 16 is connected to the second oil pipeline section 18, that is, under normal conditions, the reflux oil first flows into the second oil pipeline section 18 below after passing through the above-mentioned oil inlet 15, and when all the multi-functional cylinders 3 below are filled, it is automatically switched to the reflux oil flowing into the first oil pipeline section 17, that is, flowing into the multi-functional cylinder 3 above. During the manufacturing process, after the multifunctional cylinder 3 at the highest position is filled with heat transfer oil, the heat transfer oil continues to be input into the return oil pipe 7. The heat transfer oil overflows the multifunctional cylinder 3 and pushes the piston block 21 upward, so that the pre-filled oil pushes the sliding column 14 to move in the regulating valve body 13, thereby connecting the upper port of the flow channel hole 16 with the first oil pipeline section 17, while the lower port of the flow channel hole 16 and the interface of the second oil pipeline section 18 are staggered with each other. With such a design, when in use, the refluxed hot oil first enters the lower multifunctional cylinder 3 to be preheated to the working temperature, and then the hot oil in the upper multifunctional cylinder 3 is injected to raise the temperature to the working temperature. When in use, the strip valve hole 12 of the lower multifunctional cylinder 3 is opened first to supply high-temperature heat-conducting oil to the external heating equipment, and then the heat-conducting oil in the upper multifunctional cylinder 3 is output. In this way, it can be fully ensured that the refluxed hot oil has the minimum cooling effect on the high-temperature hot oil that has reached the working temperature in the oil storage shell 1, so that the entire heat-conducting oil furnace is always in a state where high-temperature hot oil at a predetermined temperature can be delivered at any time.

[0046] When it comes to the production of the whole machine, Figure 1As shown, the oil storage shell 1 is completely installed in a cabinet 25. The interior of the cabinet 25 is divided into an upper compartment and a lower compartment. The oil storage shell 1 is installed in the upper compartment. The output pipe section for outputting the thermal oil to the external equipment is installed on the upper part of the oil storage shell 1. If there are two oil storage shells 1, each can be provided with an output pipeline separately, and a control valve can be installed. When it is used specifically, the specific control valve can be adaptively controlled. Of course, it is also necessary to install a first valve 24 on the output pipe section, and a liquid level gauge 23 and a temperature detector are also installed on the oil storage shell to measure the implementation temperature and the internal liquid level. In addition, a base 26 is installed in the lower compartment, and an oil pump 27 is installed on the left side of the base 26. The oil pump 27 is selected to be high temperature resistant. A filter can be installed on the pipeline at the input end of the oil pump 27 for filtering, and a sewage pipe 29 extending downward can also be installed at the outlet end of the second valve 28 to clean and discharge sewage when necessary. Finally, for ease of operation, it can be as follows Figure 1 As shown, a door panel 30 is provided on one side of the cabinet 25 , and the door panel 30 is directly opposite to the end of the oil storage housing 1 where the oil inlet end of the oil return pipe 7 is located. When operation is required, the door panel 30 can be opened.

[0047] The above series of specific implementation details are merely some preferred embodiments of the present invention and cannot be used to limit the protection scope of the claims of the present invention. A person skilled in the art can simply change the design ideas based on the understanding of the above embodiments and the reference to the basic principles recorded in the claims of the present invention. However, these design changes still fall within the protection scope of the invention.

Claims

1. A thermal oil furnace, comprising a heat storage component and an electric heating pipe (4) installed in the heat storage component, wherein the heat storage component comprises an oil storage housing (1), characterized in that: The oil storage shell (1) is made of a heat-insulating material. A spiral electric heating spiral tube (2) is installed on the inner wall of the oil storage shell (1). Multifunctional cylinders (3) are installed in a circular array inside the oil storage shell (1). The multifunctional cylinders (3) are made of a heat-insulating or heat-conductive material. All the multifunctional cylinders (3) are connected to an oil return pipe (7) coaxially arranged in the oil storage shell (1) through a shunt pipe (6). The oil inlet end of the oil return pipe (7) protrudes from the end surface of the oil storage shell (1). At least one electric heating tube (4) is also installed between every two adjacent shunt pipes (6). An electric heating tube (4) for heating the hot oil in the multifunctional cylinder (3) is also coaxially mounted in the multifunctional cylinder (3). The multifunctional cylinder (3) is also provided with an oil drain valve. When the oil drain valve is opened, the hot oil in the multifunctional cylinder (3) can enter the oil storage housing (1). The oil storage housing (1) is divided into two oil storage housings (1) arranged in parallel with each other and arranged in an upper and lower manner, and the two oil storage housings (1) are connected to each other; It also comprises a first oil delivery pipe section (17) and a second oil delivery pipe section (18) respectively connected to the oil inlet ends of the upper and lower oil return pipes (7), the two oil delivery pipe sections respectively connected to the two ends of a control valve body (13) and not on the same side; an oil inlet (15) is provided at the center of the inner cavity of the control valve body (13), a sliding column (14) is linearly slidably mounted in the control valve body (13), a Z-shaped flow channel hole (16) is provided in the sliding column (14), and two ports of the flow channel hole (16) can be connected to the two oil delivery pipe sections respectively and successively during the sliding process of the sliding column (14); A transition pipe (19) is connected to one end of the control valve body (13), and the transition pipe (19) is connected to a vertically arranged compression pipe (20). The bottom end of the compression pipe (20) is inserted into the top of the multifunctional cylinder (3) at the highest point in the lower oil storage housing (1), and a piston block (21) is vertically slidably installed in the compression pipe (20). The piston block (21) is elastically supported and installed by a supporting spring (22) and can carry pre-filled oil injected above the piston block (21). The pre-filled oil fills the channel between the piston block (21) and the transition pipe (19) that is connected to each other.

2. A thermal oil furnace according to claim 1, characterized in that: The oil drain valve comprises a valve column (5) having a fan-shaped cross section, a strip-shaped valve hole (12) having a fan-shaped cross section is formed on the wall of the multifunctional cylinder (3), and the valve column (5) is located in the strip-shaped valve hole (12) and can slide in a radial straight line along the multifunctional cylinder (3) to open or close the strip-shaped valve hole (12).

3. A thermal oil furnace according to claim 2, characterized in that: It also comprises a guide rod (11), one end of which is fixed to the outer wall of the electric heating tube (4), and the other end of which is axially slidably mounted in the valve column (5) to guide the valve column (5) to slide in a radial straight line along the multifunctional cylinder (3).

4. A thermal oil furnace according to claim 2, characterized in that: The two ends of the valve column (5) extend out of the end surface of the multifunctional cylinder (3) respectively, and are slidably matched with the slide grooves provided on the inner walls of the two ends of the oil storage housing (1) to guide the valve column (5) to slide in a radial straight line along the multifunctional cylinder (3).

5. The thermal oil furnace according to claim 2, characterized in that: One end of the valve column (5) is provided with a flat thread, and a driving gear (8) is coaxially rotatably mounted on the end surface of the oil storage housing (1). One end of the driving gear (8) is located inside the oil storage housing (1) and meshes with the flat threads on the end surfaces of all the valve columns (5) to form a flat thread pair, so that when the gear of the driving gear (8) located outside the end surface of the oil storage housing (1) meshes with an external input gear, all the valve columns (5) are synchronously driven to slide out / into the corresponding strip valve holes (12) through the flat thread pair.

6. The thermal oil furnace according to claim 1, characterized in that: A return spring is provided at the joint between the transition pipe (19) and the control valve body (13), one end of the return spring is connected to the transition pipe (19), and the other end is connected to the end surface of the slide column (14), and in a non-operating state, the return spring causes the slide column (14) to be located at a position where the lower end of the flow channel hole (16) is connected to the second oil pipeline section (18); Only after the multifunctional cylinder (3) at the highest point is filled with heat transfer oil, the heat transfer oil continues to be input into the oil return pipe (7). The heat transfer oil overflows the multifunctional cylinder (3) and pushes the piston block (21) upward, so that the pre-filled oil pushes the sliding column (14) to move in the regulating valve body (13), thereby making the upper end of the flow channel hole (16) communicate with the first oil delivery pipe section (17), while the lower end of the flow channel hole (16) and the interface of the second oil delivery pipe section (18) are staggered.

7. A thermal oil furnace according to any one of claims 1 to 6, characterized in that: The oil storage shell (1) is entirely installed in a cabinet (25); the interior of the cabinet (25) is divided into an upper compartment and a lower compartment; the oil storage shell (1) is installed in the upper compartment; an output pipe section for outputting heat transfer oil to an external device is installed at the upper part of the oil storage shell (1); a first valve (24) is installed on the output pipe section; and a liquid level meter (23) and a temperature detector are also installed on the oil storage shell; A base (26) is installed in the lower bin, an oil pump (27) is installed on the left side of the base (26), a filter and a second valve (28) are installed on the pipeline at the input end of the oil pump (27), and a sewage pipe (29) extending downward is installed at the outlet end of the second valve (28).

8. A thermal oil furnace according to claim 7, characterized in that: A door panel (30) is provided on one side of the cabinet (25), and the door panel (30) is directly opposite to the end of the oil storage housing (1) where the oil inlet end of the oil return pipe (7) is located.

9. The thermal oil furnace according to claim 1, characterized in that: Each of the multifunctional cylinders (3) is also individually connected to a spare tube (10).

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