Electric heat tracing straight flow type throttle valve

Abstract

The utility model discloses an electric heat tracing straight flow type throttling valve. An inlet channel and an outlet channel are formed in the two side walls of the valve body correspondingly, and a first mounting hole is formed in the top of the valve body. A second mounting hole corresponding to the first mounting hole is formed in the valve cover; the mounting assembly is arranged on the side, away from the valve body, of the valve deck and provided with a third mounting hole corresponding to the second mounting hole. A first input end and a second input end of the temperature controller are electrically connected to the power supply and the temperature sensor respectively; the end, away from the temperature controller, of the first electric tracing band is wound around the outer wall of the valve body and then connected to the input end of the anti-explosion three-way junction box, the two output ends of the anti-explosion three-way junction box are connected to the second electric tracing bands corresponding to the output ends of the anti-explosion three-way junction box respectively, and the two second electric tracing bands are wound around the outer wall of the valve body and then connected to the anti-explosion tail end junction boxes corresponding to the second electric tracing bands. Medium solidification or unsmooth flowing can be effectively prevented, and abrasion and damage of a sealing face formed by the opening and closing assembly and the valve seat are reduced.

Description

Technical Field

[0001] The present application relates to the field of valve technology, and in particular to an electrically heated direct current throttle valve. Background Art

[0002] For a specific chemical working condition, a medium called cold mother liquid is involved. When the temperature is lower than or equal to 40°C, the medium will become viscous and easy to crystallize. In view of the unique physical properties of the cold mother liquid, it is crucial to select the appropriate valve type in the scenario where the flow rate of the cold mother liquid through the pipeline needs to be accurately controlled.

[0003] In the prior art, although the stop valve is often used for flow control under such working conditions, its flow channel structure is complex, and the medium needs to undergo a large angle change in direction after entering the flow channel, causing the medium flow to become turbulent, thereby increasing the pressure loss of the medium when passing through the valve and the resistance in the flow channel. In addition, since the stop valve usually does not have an auxiliary heating function, the cold mother liquid is prone to crystallize again when flowing through the inside of the valve. The crystallization phenomenon not only further increases the flow resistance and affects the accuracy of flow control, but also may accelerate the wear and damage to the valve sealing surface due to the accumulation of crystals, thereby shortening the service life of the valve. Utility Model Content

[0004] The embodiment of the present application provides an electrically heated direct current throttle valve, which solves the technical problems in the prior art that the stop valve does not have an auxiliary heating function, the cold mother liquid is easily crystallized again when flowing through the inside of the valve, and the valve sealing surface is easily worn and damaged.

[0005] The embodiment of the present application provides an electric heating direct current throttle valve, comprising a valve body, a valve cover, an opening and closing assembly, a mounting assembly, a heating assembly and a valve seat; the two side walls of the valve body are respectively provided with an inlet channel and an outlet channel, and a first mounting hole is provided on the top thereof; the inlet channel and the outlet channel form a straight line; the valve cover is connected to the valve body by a first fastener, and is provided with a second mounting hole corresponding to the first mounting hole; the valve seat is arranged at the intersection of the inlet channel and the outlet channel; the mounting assembly is arranged on a side of the valve cover away from the valve body, and is provided with a third mounting hole corresponding to the second mounting hole; after one end of the opening and closing assembly passes through the third mounting hole, the second mounting hole and the first mounting hole, it abuts against the inner wall of the valve seat and is configured to seal the valve; the heating assembly comprises a first electric heating tape, An explosion-proof three-way junction box, a thermostat, a temperature sensor, two second electric heating tapes and two explosion-proof terminal junction boxes; the explosion-proof three-way junction box, the temperature sensor and the two explosion-proof terminal junction boxes are all installed on the outer wall of the valve body; the thermostat is installed on the mounting assembly, the first input end of the thermostat is electrically connected to the power supply, the second input end is electrically connected to the temperature sensor, and the output end of the thermostat is connected to the first electric heating tape; the end of the first electric heating tape away from the thermostat is wound around the outer wall of the valve body and then connected to the input end of the explosion-proof three-way junction box, the two output ends of the explosion-proof three-way junction box are respectively connected to the corresponding second electric heating tapes, and the ends of the two second electric heating tapes away from the explosion-proof three-way junction box are respectively wound around the outer wall of the valve body and then connected to the corresponding explosion-proof terminal junction boxes.

[0006] In a possible implementation, the heating assembly also includes an insulation layer; the insulation layer is sleeved on the outer wall of the valve body and is located on a side of the first electric heating tape, the explosion-proof three-way junction box, the temperature sensor, the two second electric heating tapes and the two explosion-proof terminal junction boxes away from the valve body.

[0007] In a possible implementation, the opening and closing assembly includes a valve stem and a valve flap; one end of the valve stem passes through the third mounting hole, the second mounting hole and the first mounting hole, and is connected to the valve flap, and the side wall of the valve flap abuts against the inner wall of the valve seat.

[0008] In a possible implementation manner, a side of the valve flap facing the inlet channel is a conical structure.

[0009] In a possible implementation, the opening and closing assembly further includes a hand wheel; the hand wheel is disposed at an end of the valve stem away from the valve disc.

[0010] In a possible implementation, the mounting assembly includes a nut seat and a plurality of columns; the plurality of columns are all mounted on the circumference of a side of the valve cover away from the valve body; the nut seat is provided with a third mounting hole corresponding to the second mounting hole, and one end of the plurality of columns away from the valve cover is connected to the nut seat; the thermostat is mounted on the outer wall of one of the columns.

[0011] In a possible implementation, the electrically heated direct current throttle valve further includes a sealing assembly; one end of the sealing assembly passes through the second mounting hole, extends into the valve body, and is located on the outside of the opening and closing assembly.

[0012] In a possible implementation, the sealing assembly includes a mounting seat, a sealing packing layer, a packing sleeve and a packing pressure plate; the mounting seat is arranged in the second mounting hole and extends into the valve body, and forms a accommodating chamber with the outer wall of the opening and closing assembly; the sealing packing layer is located in the accommodating chamber; the packing sleeve is arranged at one end of the sealing packing layer away from the valve body; the packing pressure plate is arranged at one end of the packing sleeve away from the sealing packing layer, and is connected to the valve cover through a second fastener.

[0013] In a possible implementation, the sealing assembly further includes an anti-crystallization sleeve; the anti-crystallization sleeve is disposed between the inner wall of the mounting seat and the outer wall of the opening and closing assembly, and is located at one end of the sealing packing layer away from the packing sleeve.

[0014] In a possible implementation, the electric heating direct current throttle valve also includes an indicator arrow; two columns are provided, and are respectively located on both sides of the opening and closing component; a scale line is provided on the outer wall of one of the columns; one end of the indicator arrow is fixed to the outer wall of the opening and closing component, and the other end thereof abuts against the scale line.

[0015] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects:

[0016] The electric heating direct current throttle valve provided in the embodiment of the present application includes a valve body, a valve cover, an opening and closing assembly, a mounting assembly, a heating assembly and a valve seat. The inlet channel and the outlet channel of the valve body of the present application have a smooth transition and are straight. This design reduces the change of direction of the medium when passing through the valve, and hardly disturbs the original flow direction of the medium, thereby effectively reducing the pressure loss of the medium when passing through the valve. In addition, the present application integrates a thermostat and a temperature sensor to form an intelligent temperature control system. The system can automatically adjust the heating power of the first electric heating belt and the two second electric heating belts through the thermostat according to the feedback of the temperature sensor to achieve precise temperature control. The first electric heating belt is not only directly wrapped around the outer wall of the valve body for heating, but also distributes the heat to the two second electric heating belts through the explosion-proof three-way junction box, thereby achieving distributed heat transfer. This design not only expands the heating range, but also improves the heating efficiency, which helps to raise the medium in the valve body to the required temperature faster and shorten the heating time. At the same time, the explosion-proof three-way junction box and explosion-proof terminal junction box adopted in this application, when used in flammable and explosive environments, effectively reduce the safety risks that may be caused by the heating components, ensuring the stable operation of the equipment and the safety of the workplace. Therefore, the electric heating direct current throttle valve is suitable for various media control occasions that need to maintain a certain temperature, especially in low temperature and easy freezing environments. It can effectively prevent the medium from solidifying or flowing smoothly, further reducing the wear and damage of the sealing surface formed by the opening and closing components and the valve seat, thereby increasing the service life of the throttle valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A schematic diagram of the structure of an electrically heated direct current throttle valve provided in an embodiment of the present application;

[0019] Figure 2 for Figure 1 A local enlarged view of point A;

[0020] Figure 3 A schematic diagram of the structure of a heating assembly provided in an embodiment of the present application;

[0021] Figure 4 A schematic diagram of the structure of the valve body provided in the embodiment of the present application;

[0022] Figure 5 A schematic diagram of the structure of the opening and closing assembly provided in an embodiment of the present application.

[0023] Icons: 1-valve body; 11-inlet channel; 12-outlet channel; 13-first mounting hole; 2-valve cover; 21-first fastener; 3-opening and closing assembly; 31-valve stem; 32-valve disc; 321-conical structure; 33-handwheel; 4-mounting assembly; 41-third mounting hole; 42-nut seat; 43-column; 5-heating assembly; 51-first electric heating tape; 52-explosion-proof three-way junction box; 53-thermostat; 54-temperature sensor; 55-second electric heating tape; 56-explosion-proof terminal junction box; 57-insulation layer; 6-sealing assembly; 61-mounting seat; 62-sealing packing layer; 63-packing sleeve; 64-packing pressure plate; 65-anti-crystallization sleeve; 66-second fastener; 7-indicator arrow; 8-scale line; 9-valve seat. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0025] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. The terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0026] The present application embodiment provides an electrically heated direct current throttle valve, such as Figures 1 to 5As shown. The electric heating direct current throttle valve includes a valve body 1, a valve cover 2, an opening and closing assembly 3, a mounting assembly 4, a heating assembly 5 and a valve seat 9. The two side walls of the valve body 1 are respectively provided with an inlet channel 11 and an outlet channel 12, and a first mounting hole 13 is provided on the top thereof. The inlet channel 11 and the outlet channel 12 form a straight line. The valve cover 2 is connected to the valve body 1 through a first fastener 21, and is provided with a second mounting hole corresponding to the first mounting hole 13. The valve seat 9 is arranged at the intersection of the inlet channel 11 and the outlet channel 12. The mounting assembly 4 is arranged on the side of the valve cover 2 away from the valve body 1, and is provided with a third mounting hole 41 corresponding to the second mounting hole. After one end of the opening and closing assembly 3 passes through the third mounting hole 41, the second mounting hole and the first mounting hole 13, it abuts against the inner wall of the valve seat 9 and is configured as a sealing valve. The heating assembly 5 includes a first electric heating tape 51, an explosion-proof three-way junction box 52, a thermostat 53, a temperature sensor 54, two second electric heating tapes 55 and two explosion-proof terminal junction boxes 56. The explosion-proof three-way junction box 52, the temperature sensor 54 and the two explosion-proof terminal junction boxes 56 are all installed on the outer wall of the valve body 1. The thermostat 53 is installed on the mounting assembly 4, the first input end of the thermostat 53 is electrically connected to the power supply, the second input end thereof is electrically connected to the temperature sensor 54, and the output end of the thermostat 53 is connected to the first electric heating tape 51. The end of the first electric heating tape 51 away from the thermostat 53 is wound around the outer wall of the valve body 1 and then connected to the input end of the explosion-proof three-way junction box 52, the two output ends of the explosion-proof three-way junction box 52 are respectively connected to the corresponding second electric heating tapes 55, and the ends of the two second electric heating tapes 55 away from the explosion-proof three-way junction box 52 are respectively wound around the outer wall of the valve body 1 and then connected to the corresponding explosion-proof terminal junction boxes 56.

[0027] Specifically, the temperature controller 53 of the present application can control the temperature of the medium at 75-85°C, solving the problem that when the temperature is lower than 40°C, the medium is prone to become viscous and crystallized, the fluid resistance increases, and the sealing surface is easily damaged.

[0028] Furthermore, the connection points between the first electric heating tape 51 and the thermostat 53, the connection points between the first electric heating tape 51 and the explosion-proof three-way junction box 52, the connection points between the second electric heating tape 55 and the explosion-proof three-way junction box 52, and the connection points between the second electric heating tape 55 and the explosion-proof terminal junction box 56 are all sealed with silicone.

[0029] It should be noted that the inlet channel 11 and the outlet channel 12 of the valve body 1 of the present application have a smooth transition and are straight. This design reduces the change in direction of the medium when passing through the valve, and hardly disturbs the original flow direction of the medium, thereby effectively reducing the pressure loss of the medium when passing through the valve. In addition, the present application integrates a thermostat 53 and a temperature sensor 54 to form an intelligent temperature control system. The system can automatically adjust the heating power of the first electric heating belt 51 and the two second electric heating belts 55 through the thermostat 53 according to the feedback of the temperature sensor 54 to achieve precise temperature control. The first electric heating belt 51 is not only directly wrapped around the outer wall of the valve body 1 for heating, but also distributes heat to the two second electric heating belts 55 through the explosion-proof three-way junction box 52, thereby achieving distributed heat transfer. This design not only expands the heating range, but also improves the heating efficiency, which helps to raise the medium in the valve body 1 to the required temperature more quickly and shortens the heating time. At the same time, the explosion-proof three-way junction box 52 and the explosion-proof terminal junction box 56 adopted in the present application effectively reduce the safety risks that may be caused by the heating component 5 when used in an inflammable and explosive environment, ensuring the stable operation of the equipment and the safety of the workplace. Therefore, the electric heating direct current throttle valve is suitable for various medium control occasions that need to maintain a certain temperature, especially in low temperature and easy freezing environments. It can effectively prevent the medium from solidifying or flowing poorly, further reducing the wear and damage of the sealing surface formed by the opening and closing component 3 and the valve seat 9, thereby increasing the service life of the throttle valve.

[0030] In the embodiment of the present application, the heating assembly 5 further includes an insulation layer 57. The insulation layer 57 is sleeved on the outer wall of the valve body 1 and is located on the side of the first electric heating tape 51, the explosion-proof three-way junction box 52, the temperature sensor 54, the two second electric heating tapes 55 and the two explosion-proof terminal junction boxes 56 away from the valve body 1.

[0031] Specifically, the insulation layer 57 of the present application is insulation cotton, and the outer side of the insulation cotton is wrapped and fixed with aluminum tape. The insulation cotton effectively blocks the direct erosion of the valve body 1 and other heating components 5 by harmful substances such as moisture and corrosive gases in the external environment, thereby ensuring the long-term stable operation of the equipment and extending the service life of the equipment.

[0032] In the embodiment of the present application, the opening and closing assembly 3 includes a valve stem 31 and a valve flap 32. One end of the valve stem 31 passes through the third mounting hole 41, the second mounting hole and the first mounting hole 13, and is connected to the valve flap 32, and the side wall of the valve flap 32 abuts against the inner wall of the valve seat 9.

[0033] It should be noted that when the valve flap 32 is in working state, its side wall is tightly in contact with the inner wall of the valve seat 9, thereby ensuring the sealing of the valve.

[0034] In the embodiment of the present application, the side of the valve flap 32 facing the inlet channel 11 is a conical structure 321 .

[0035] It should be noted that the side of the valve flap 32 facing the inlet channel 11 is a conical structure 321. This conical structure 321 not only has a unique cross-sectional variation characteristic, but also can accurately control the flow rate by occupying effective areas of different sizes as the valve flap 32 penetrates the valve seat 9. Specifically, as the valve flap 32 enters the valve seat 9 deeper, the effective area occupied by the conical structure 321 will gradually increase, and correspondingly, the remaining flowable area will increase by an equal amount according to the preset relative stroke. This change process follows a certain flow characteristic law, that is, the relative flow coefficient will increase by an equal percentage as the stroke of the valve stem 31 changes, thereby achieving accurate control of the medium flow rate.

[0036] In the embodiment of the present application, the opening and closing assembly 3 further includes a hand wheel 33. The hand wheel 33 is arranged at one end of the valve stem 31 away from the valve flap 32, so that the operator can directly control the opening and closing of the valve flap 32 by rotating the hand wheel 33, thereby improving work efficiency.

[0037] In the embodiment of the present application, the mounting assembly 4 includes a nut seat 42 and a plurality of columns 43. The plurality of columns 43 are all mounted on the circumference of the side of the valve cover 2 away from the valve body 1. The nut seat 42 is provided with a third mounting hole 41 corresponding to the second mounting hole, and one end of the plurality of columns 43 away from the valve cover 2 is connected to the nut seat 42. The thermostat 53 is mounted on the outer wall of one of the columns 43.

[0038] It should be noted that multiple columns 43 are evenly distributed on the side of the valve cover 2 away from the valve body 1, and are connected to the nut seat 42 to form a stable support structure. This design can effectively disperse the force and torque generated when the valve is operated, enhance the stability of the overall structure, and prevent deformation or damage caused by uneven force.

[0039] In the embodiment of the present application, the electric heating direct current throttle valve further includes a sealing component 6. One end of the sealing component 6 passes through the second mounting hole and extends into the valve body 1, and is located outside the opening and closing component 3.

[0040] In the embodiment of the present application, the sealing assembly 6 includes a mounting seat 61, a sealing packing layer 62, a packing gland 63 and a packing pressure plate 64. The mounting seat 61 is arranged in the second mounting hole, extends into the valve body 1, and forms a receiving chamber with the outer wall of the opening and closing assembly 3. The sealing packing layer 62 is located in the receiving chamber. The packing gland 63 is arranged at one end of the sealing packing layer 62 away from the valve body 1. The packing pressure plate 64 is arranged at one end of the packing gland 63 away from the sealing packing layer 62, and is connected to the valve cover 2 through the second fastener 66.

[0041] In the embodiment of the present application, the sealing assembly 6 further comprises an anti-crystallization sleeve 65. The anti-crystallization sleeve 65 is arranged between the inner wall of the mounting seat 61 and the outer wall of the opening and closing assembly 3, and is located at one end of the sealing packing layer 62 away from the packing gland 63.

[0042] It should be noted that the anti-crystallization sleeve 65 can prevent the medium from crystallizing inside the valve or on the surface of the mounting seat 61 under low temperature or specific conditions, thereby maintaining the normal operation of the valve.

[0043] In the embodiment of the present application, the electric heating direct current throttle valve further includes an indicator arrow 7. Two columns 43 of the present application are provided, and are respectively located on both sides of the opening and closing component 3. A scale line 8 is provided on the outer wall of one of the columns 43. One end of the indicator arrow 7 is fixed to the outer wall of the opening and closing component 3, and the other end thereof abuts against the scale line 8.

[0044] It should be noted that, in the present application, through the guidance of the scale line 8, the operator can adjust the valve more accurately, thus avoiding misoperation due to inaccurate estimation.

[0045] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0046] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. An electrically heated direct current throttle valve, characterized in that: It comprises a valve body (1), a valve cover (2), an opening and closing assembly (3), a mounting assembly (4), a heating assembly (5) and a valve seat (9); The two side walls of the valve body (1) are respectively provided with an inlet channel (11) and an outlet channel (12), and a first mounting hole (13) is provided on the top thereof; the inlet channel (11) and the outlet channel (12) form a straight line; The valve cover (2) is connected to the valve body (1) via a first fastener (21), and is provided with a second mounting hole corresponding to the first mounting hole (13); The valve seat (9) is arranged at the intersection of the inlet channel (11) and the outlet channel (12); The mounting assembly (4) is arranged on a side of the valve cover (2) away from the valve body (1), and is provided with a third mounting hole (41) corresponding to the second mounting hole; After one end of the opening and closing component (3) passes through the third mounting hole (41), the second mounting hole and the first mounting hole (13), it abuts against the inner wall of the valve seat (9) and is configured as a sealing valve; The heating assembly (5) comprises a first electric heating tape (51), an explosion-proof three-way junction box (52), a thermostat (53), a temperature sensor (54), two second electric heating tapes (55) and two explosion-proof terminal junction boxes (56); The explosion-proof three-way junction box (52), the temperature sensor (54) and the two explosion-proof terminal junction boxes (56) are all mounted on the outer wall of the valve body (1); The temperature controller (53) is installed on the installation assembly (4), a first input end of the temperature controller (53) is electrically connected to a power source, a second input end thereof is electrically connected to the temperature sensor (54), and an output end of the temperature controller (53) is connected to the first electric heating tape (51); One end of the first electric heating tape (51) away from the thermostat (53) is wound around the outer wall of the valve body (1) and then connected to the input end of the explosion-proof three-way junction box (52); two output ends of the explosion-proof three-way junction box (52) are respectively connected to the corresponding second electric heating tapes (55); and one end of the two second electric heating tapes (55) away from the explosion-proof three-way junction box (52) is respectively wound around the outer wall of the valve body (1) and then connected to the corresponding explosion-proof terminal junction boxes (56).

2. The electrically heated direct current throttle valve according to claim 1, characterized in that: The heating component (5) further comprises a heat-insulating layer (57); The thermal insulation layer (57) is sleeved on the outer wall of the valve body (1) and is located on a side of the first electric heating tape (51), the explosion-proof three-way junction box (52), the temperature sensor (54), the two second electric heating tapes (55) and the two explosion-proof terminal junction boxes (56) away from the valve body (1).

3. The electrically heated direct current throttle valve according to claim 1, characterized in that: The opening and closing assembly (3) comprises a valve stem (31) and a valve flap (32); One end of the valve stem (31) passes through the third mounting hole (41), the second mounting hole and the first mounting hole (13), and is then connected to the valve flap (32), and a side wall of the valve flap (32) abuts against an inner wall of the valve seat (9).

4. The electrically heated direct current throttle valve according to claim 3, characterized in that: The side of the valve flap (32) facing the inlet channel (11) is a conical structure (321).

5. The electrically heated direct current throttle valve according to claim 3, characterized in that: The opening and closing assembly (3) further comprises a hand wheel (33); The hand wheel (33) is arranged at an end of the valve stem (31) away from the valve flap (32).

6. The electrically heated direct current throttle valve according to claim 1, characterized in that: The mounting assembly (4) comprises a nut seat (42) and a plurality of columns (43); The plurality of upright posts (43) are all mounted on the circumference of a side of the valve cover (2) away from the valve body (1); The nut seat (42) is provided with a third mounting hole (41) corresponding to the second mounting hole, and one end of a plurality of the uprights (43) away from the valve cover (2) is connected to the nut seat (42); The temperature controller (53) is installed on the outer wall of one of the columns (43).

7. The electrically heated direct current throttle valve according to claim 1, characterized in that: Also included is a sealing assembly (6); One end of the sealing component (6) passes through the second mounting hole, extends into the valve body (1), and is located outside the opening and closing component (3).

8. The electrically heated direct current throttle valve according to claim 7, characterized in that: The sealing assembly (6) comprises a mounting seat (61), a sealing packing layer (62), a packing pressing sleeve (63) and a packing pressing plate (64); The mounting seat (61) is arranged in the second mounting hole and extends into the valve body (1), and forms a receiving chamber with the outer wall of the opening and closing assembly (3); The sealing filler layer (62) is located in the accommodating chamber; The packing gland (63) is arranged at an end of the sealing packing layer (62) away from the valve body (1); The packing pressure plate (64) is arranged at one end of the packing pressure sleeve (63) away from the sealing packing layer (62), and is connected to the valve cover (2) via a second fastener (66).

9. The electrically heated direct current throttle valve according to claim 8, characterized in that: The sealing assembly (6) further comprises an anti-crystallization sleeve (65); The anti-crystallization shaft sleeve (65) is arranged between the inner wall of the mounting seat (61) and the outer wall of the opening and closing component (3), and is located at an end of the sealing packing layer (62) away from the packing pressing sleeve (63).

10. The electrically heated direct current throttle valve according to claim 6, characterized in that: Also includes an indicator arrow (7); Two upright posts (43) are provided, and are respectively located on two sides of the opening and closing component (3); The outer wall of one of the upright posts (43) is provided with scale lines (8); One end of the indicating arrow (7) is fixed to the outer wall of the opening and closing component (3), and the other end thereof abuts against the scale line (8).

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