Drain valve

Abstract

The utility model discloses a drain valve which comprises a valve body, a valve core is arranged in the valve body, an upper end cover is arranged at an inlet of the valve body, and a lower end cover is arranged at an outlet of the valve body. According to the utility model, the problem of insufficient air tightness of the drain valve is solved by arranging the chamfered surface and the sealing ring I at the inlet end of the valve body, arranging the O-shaped sealing ring in the outer ring groove of the valve body and arranging the sealing ring II in the arc-shaped ring groove at the bottom of the spacer bush. The sensor assembly is arranged in the mounting groove in a matched mode, the mounting position is reasonable, and mounting is convenient. The pressure sensor is arranged right opposite to the drain hole, so that circulation is smooth, signal transmission is more stable, and the problem that a feedback signal of the drain valve is not sensitive is solved. The spring and the sealant are arranged in the valve element, the upper section and the lower section are consistent, the section and the height of the valve element are increased, meanwhile, the height of the coil is correspondingly increased, and the problem that electromagnetic attraction is insufficient is solved. The utility model has the advantages of small volume, multiple functions, convenience in installation and replacement and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile air brake system, especially a drain valve. BACKGROUND

[0002] The compressed air of the automobile air brake system can form a small amount of condensate in the air cylinder, if not discharged in time, can cause the air cylinder and the corrosion of the auxiliary pipeline, winter zero degree or so can also produce ice block pipeline. The existing similar products have the problems of insufficient electromagnetic attraction, pressure sensor feedback signal is not sensitive, temperature sensor installation position is not reasonable and is easy to leak, sealing system is easy to leak and the like.

[0003] The utility model discloses a kind of drain valves for automobile air brake system, including valve body, upper cover is set on valve body top, rear cover is set in valve body bottom, drain hole in the center of upper cover, it is characterized by: the center of valve body bottom is round hole, cone head pressure block is placed in round hole, the lower conical surface of cone head pressure block is provided with diaphragm pressure sensor, its upper surface is subjected to airflow impact;Heating film is set on valve body inner hole wall, the wire of heating film passes from valve body interior;Center sleeve is set in valve body, valve core of the magnetic material is set in center sleeve, the center hole of center sleeve is the movement passage of valve core, the upper part of valve core is pressed spring, the two sides of valve core and center sleeve inner hole are cooperated into clearance, as drain passage;Valve core is sleeved into coil, rear cover is also opened with drain hole;When coil is powered on to generate magnetic field force, valve core is moved upwards to the lower side of upper cover by overcoming spring force and gas pressure, at this time, condensate stored in air cylinder enters the space above center sleeve in steam-water mixed state through the drain hole in the center of upper cover, then enters valve body along the drain passage clearance of the two sides of valve core, steam-water mixture reaches valve body rear end space, finally is discharged to atmosphere from the drain hole of rear cover.

[0004] The drain valve for automobile air brake system described above has the functions of drainage, alarm and heating, and is light in weight and small in size, but cannot solve the problems of poor air tightness, insufficient electromagnetic attraction, unreasonable sensor installation position and insensitive feedback signal in the prior art. UTILITY MODEL CONTENTS

[0005] In view of the deficiencies in the above background art, the utility model provides a drain valve, which solves the problems of poor air tightness, insufficient electromagnetic attraction, unreasonable sensor installation position and insensitive feedback signal in the prior art.

[0006] The technical scheme of the utility model is implemented as follows:

[0007] A kind of drain valve, including valve body, valve body is equipped with valve core, the inlet end of valve body is equipped with upper end cap, outlet end is equipped with lower end cap.The upper end cap and lower end cap are equipped with water inlet hole and water outlet hole respectively;The valve body is equipped with conical boss, conical boss divides the upper cavity and lower cavity of valve body, conical boss is equipped with the drain hole for communicating the upper cavity and lower cavity of valve body;Upper cavity in the valve body is equipped with spacer sleeve, spacer sleeve is equipped with valve core, the side wall of valve core is equipped with arc drainage groove, one end of valve core is abutted in water inlet hole by spring, the other end is abutted at drain hole, spacer sleeve is equipped with coil, heating film is arranged between valve body and coil, and gap is left between the lower part of heating film and valve body;Lower cavity of valve body is equipped with sensor assembly corresponding to drain hole up and down.By setting arc drainage groove, the flowability of condensate in valve core is increased.By leaving gap between heating film and valve body, installation space is increased.By setting sensor assembly corresponding to drain hole up and down, signal transmission is more stable and sensitive.

[0008] Further, the upper end cap is provided with external thread II, the root of external thread II is provided with sealing groove, and sealing groove is provided with sealing ring I;The upper end cap is threadedly connected to the inlet end of the valve body, thereby ensuring stable connection of the upper end cap.The inner end face of the inlet of the valve body is a chamfered face, the sealing ring I is sealed with the chamfered face, and the airtightness of the upper end cap and the valve body is improved.The outer portion of the valve body is provided with an outer step, the outer step is provided with an outer ring groove, the outer ring groove is provided with an O-shaped sealing ring, and the sealing property of the drain valve when connected to the air brake system is improved.

[0009] Further, the top of the upper end cap is provided with a boss I for positioning the filter screen, thereby facilitating installation, allowing the filter screen to cover the water inlet hole, and preventing large particles from entering the valve body to cause blockage.The bottom of the upper end cap is provided with a boss II, the boss II and the bottom surface of the upper end cap form a groove, and the groove is used for positioning the upper end of the spacer sleeve.One end of the spacer sleeve is inserted into the groove, and the other end of the spacer sleeve is sleeved on the conical boss, and an arc-shaped sealing structure is arranged between the spacer sleeve and the conical boss, thereby ensuring the sealing property of the spacer sleeve.

[0010] Further, the bottom of the filter screen is provided with a circular table base, the circular table base is bonded to the top surface of the upper end cap, thereby ensuring stable connection of the upper end cap.The boss I and the boss II are respectively provided with a cross-shaped drainage groove I and a cross-shaped drainage groove II, the cross-shaped drainage groove I and the cross-shaped drainage groove II are communicated with the water inlet hole, the flow area is increased, and the flow property of the upper end cap is improved.

[0011] Further, the arc-shaped sealing structure comprises an arc-shaped ring groove arranged at the lower end surface of the spacer sleeve, and the arc-shaped ring groove is provided with a sealing ring II, thereby improving the airtightness of the spacer sleeve.

[0012] Further, the valve body is provided with a cable groove communicating with the upper cavity and the lower cavity, the lower cavity of the valve body is provided with a drainage passage and a mounting groove at the drainage hole, the drainage passage increases the flow area and improves the flow of condensed water in the lower cavity, the mounting groove is communicated with the cable groove to facilitate the guiding of the connecting wire, the mounting groove comprises a mounting groove I and a mounting groove II, the mounting groove I is larger than the groove depth of the mounting groove II, and the mounting groove I provides a mounting platform for the sensing assembly to ensure the stable installation of the sensing assembly.

[0013] Further, the sensing assembly comprises a pressure sensor and a temperature sensor, the pressure sensor is arranged in the mounting groove I and faces the drainage hole to improve the sensitivity of the pressure sensor, and the temperature sensor is arranged in the mounting groove II, the temperature sensor corresponds to the heating film to facilitate the opening and closing of the heating film, the side surface of the valve body is provided with a light hole for guiding the connecting wire, and the light hole is arranged on one side of the cable groove to facilitate the leading-out of the connecting wire, and the arrangement of the connecting wire is reasonable, safe and reliable.

[0014] Further, the lower end cover is threadedly connected to the outlet of the valve body to ensure the stable connection of the lower end cover, the top of the lower end cover is provided with a small circular boss, the sensing assembly is fixed on the lower cavity through the small circular boss to facilitate the installation of the sensing assembly, and the small circular boss and the top surface of the lower end cover form an annular groove, and the water outlet hole is arranged on the annular groove to improve the flow of condensed water.

[0015] Further, the heating film is arranged on the inner wall of the upper cavity of the valve body in a surrounding mode, so that the heating film can sufficiently heat the valve body, the bottom of the upper cavity of the valve body is provided with an inner annular groove, the inner annular groove forms an annular gap between the heating film and the inner wall of the valve body, the installation space is increased, and the terminal of the heating film is prevented from interfering with the coil.

[0016] Further, the valve core is a cylinder, and the upper and lower sections of the valve core are consistent, the upper end surface of the valve core is provided with a chamfer and a blind hole I, the blind hole I is provided with a spring, the lower end surface of the valve core is provided with a blind hole II, the blind hole II is filled with sealing glue, and the spring and the sealing glue are arranged in the blind hole II, the length of the valve core is increased, the coil is correspondingly increased, and the electromagnetic attraction force is improved.

[0017] The utility model discloses the beneficial effects are as follows:

[0018] This invention significantly improves the airtightness of all parts of the drain valve by setting a chamfered surface at the valve body inlet end and sealing ring I, setting an O-ring seal in the outer annular groove of the valve body, and setting a sealing ring II in the arc-shaped annular groove at the bottom of the spacer, thus ensuring the safety and reliability of the drain valve. The sensor assembly of this invention is fitted into the mounting groove and secured by a small round boss on the lower end cover, with a reasonable installation position for easy installation; the mounting groove communicates with the cable groove, facilitating the guidance of the connecting wire. The pressure sensor of this invention is positioned directly opposite the drain hole, ensuring smooth flow, more stable signal transmission, and more sensitive feedback. The valve core of this invention uses an internally incorporated spring and sealant, with consistent upper and lower cross-sections, increasing the cross-section and height of the valve core, and correspondingly increasing the height of the coil, thereby improving the electromagnetic attraction of the drain valve.

[0019] This invention increases the installation space of the heating film by setting an inner annular groove in the valve body, preventing leakage caused by interference between the heating film's lead terminals and the coil. It also increases the flow area of ​​the upper end cover by setting cross-shaped drainage grooves I and II, improving fluidity. Furthermore, it increases fluidity and accelerates condensate drainage by setting a water outlet hole in the annular groove of the lower end cover. Finally, it ensures temperature stability of the filter screen and improves its airtightness by setting a frustum-shaped base on the filter screen and bonding it to the top surface of the upper end cover with epoxy resin. This invention has the advantages of small size, multiple functions, and convenient installation and replacement. Attached Figure Description

[0020] To more clearly illustrate the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the top of the valve body of this utility model;

[0023] Figure 3 This is a schematic diagram of the bottom of the valve body of this utility model;

[0024] Figure 4 This is a top view of the upper cover of this utility model;

[0025] Figure 5 This is a schematic diagram of the bottom of the upper cover of this utility model;

[0026] Figure 6 This is a schematic diagram of the structure of the spacer of this utility model;

[0027] Figure 7 Structure diagram of the filter screen of the utility model;

[0028] Figure 8 Top view of the lower end cover of the utility model;

[0029] Figure 9 Bottom view of the lower end cover of the utility model;

[0030] Figure 10 Structure diagram of the valve core of the utility model;

[0031] 1, valve body; 2, valve core; 3, upper end cover; 4, lower end cover; 5, water inlet hole; 6, water outlet hole; 7, conical boss; 8, drain hole; 9, spacer sleeve; 10, arc-shaped drain groove; 11, spring; 12, coil; 13, heating film; 14, chamfered surface; 15, boss I; 16, boss II; 17, filter screen; 18, circular table base; 19, arc-shaped ring groove; 20, O-shaped sealing ring; 21, drainage channel; 22, mounting groove I; 23, mounting groove II; 24, pressure sensor; 25, temperature sensor; 26, small circular boss; 27, ring groove; 28, chamfer; 29, blind hole I; 30, blind hole II; 31, outer ring groove; 32, cross-shaped drain groove I; 33, cross-shaped drain groove II; 34, sealing groove; 35, inner ring groove; 36, cable groove; 37, light hole; 38, sealing ring I; 39, sealing ring II. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0033] In this embodiment, as Figure 1As shown in the figure, a drain valve comprises a valve body 1 for providing installation and support platform for other components. A valve core 2 is arranged in the valve body 1, an upper end cover 3 is arranged at the inlet end of the valve body 1, and a lower end cover 4 is arranged at the outlet end of the valve body 1, which ensures the air tightness of the valve body 1. The upper end cover 3 and the lower end cover 4 are respectively provided with a water inlet hole 5 and a water outlet hole 6, and the condensed water in the automobile air cylinder enters the valve body 1 through the water inlet hole 5 and then is discharged from the water outlet hole 6. A conical boss 7 is arranged in the valve body 1, which divides the valve body 1 into an upper cavity and a lower cavity, and the conical boss 7 is provided with a drain hole 8 communicating the upper cavity and the lower cavity. A spacer sleeve 9 is arranged in the upper cavity of the valve body 1, the valve core 2 is arranged in the spacer sleeve 9, and the valve core 2 is slidably arranged in the spacer sleeve 9 and can move up and down; an arc-shaped drain groove 10 is arranged on the side wall of the valve core 2, and the condensed water enters the upper cavity from the water inlet hole 5 and flows through the arc-shaped drain groove 10. One end of the valve core 2 abuts against the water inlet hole 5 through a spring 11, and the other end abuts against the drain hole 8. A coil 12 is arranged outside the spacer sleeve 9, and the two ends of the coil 12 are tightly attached to insulating pads. Specifically, when the control system issues a drain instruction, the coil 12 is powered to generate a magnetic field force, thereby driving the valve core 2 made of magnetically conductive material to overcome the spring force to open the drain hole 8, so that the condensed water enters the lower cavity through the drain hole 8. A heating film 13 is arranged between the valve body 1 and the coil 12, and a gap is left between the lower part of the heating film 13 and the valve body 1, which provides a larger installation space. The lower cavity of the valve body 1 is provided with a sensor assembly corresponding to the drain hole 8 in a vertical direction, thereby realizing the alarm function and heating function of the drain valve.

[0034] Based on the above-mentioned embodiments, as a preferred embodiment, Figure 1 As shown in the figure, the upper end cover 3 is provided with external threads II, so that the upper end cover 3 is threadedly connected to the inlet end of the valve body 1. The root of the external threads II is provided with a sealing groove 34, and a sealing ring I 38 is arranged in the sealing groove 34 to improve the sealing performance. The inner end surface of the inlet of the valve body 1 is a chamfered surface 14; when the upper end cover 3 is threadedly connected to the inlet end of the valve body 1, the sealing ring I 38 on the upper end cover 3 is sealed with the chamfered surface 14, thereby improving the sealing performance of the upper end cover 3 and the inlet end of the valve body 1. The outer part of the valve body 1 is provided with an outer step, and an outer ring groove 31 is arranged on the outer step, and an O-shaped sealing ring 20 is arranged in the outer ring groove 31, thereby ensuring the sealing performance of the valve body 1 and the connection of the automobile air brake system.

[0035] On the basis of the above embodiment, as a preferred embodiment, the top of the upper end cover 3 is provided with a boss I 15 for positioning the filter screen 17, and the filter screen 17 is sleeved on the boss I 15 for positioning. The bottom of the upper end cover 3 is provided with a boss II 16, and the boss II 16 and the bottom surface of the upper end cover 3 form a groove for positioning the spacer sleeve 9; preferably, a sealing ring is arranged in the groove to ensure the sealing between the spacer sleeve 9 and the groove. One end of the spacer sleeve 9 is inserted into the groove, and the other end is sleeved on the conical boss 7, and an arc-shaped sealing structure is arranged between the spacer sleeve 9 and the conical boss 7. Preferably, the upper end cover 3 is made of a magnetic conductive material, the boss 16 acts as an electromagnetic armature under the action of the coil, and the boss 16 attracts the valve core 2 to move quickly against the spring force, thereby improving the sensitivity and working efficiency of the drain valve.

[0036] On the basis of the above embodiment, as a preferred embodiment, the filter screen 17 is made of a stainless steel screen to prevent large particles of new corrosion bodies from entering the valve body 1 and causing blockage. The bottom of the filter screen 17 is provided with a circular table base 18, which is bonded to the top surface of the upper end cover 3 by epoxy resin when the filter screen 17 is sleeved on the boss I 15, thereby ensuring the stable connection of the filter screen 17. The boss I 15 and the boss II 16 are respectively provided with a cross-shaped drainage groove I 32 and a cross-shaped drainage groove II 33, both of which are communicated with the water inlet hole 5, thereby increasing the flow area of the upper end cover 3 and accelerating the flowability of the condensed water.

[0037] On the basis of the above embodiment, as a preferred embodiment, the arc-shaped sealing structure includes an arc-shaped ring groove 19 arranged on the lower end surface of the spacer sleeve 9. Preferably, the bottom of the spacer sleeve 9 is provided with a circular table, and the top of the circular table can be used to place the coil 12, and the structure is compact. The bottom end surface of the circular table is provided with an arc-shaped ring groove 19, and a sealing ring II 39 is arranged in the arc-shaped ring groove 19; the upper end and the lower end of the spacer sleeve 9 are provided with two sealing rings with the same specifications, which greatly enhances the sealing performance of the spacer sleeve 9 in the valve body 1, thereby ensuring the safe operation of the drain valve. The air tightness between the spacer sleeve 9 and the conical boss 7 is ensured.

[0038] On the basis of the above embodiment, as a preferred embodiment, the valve core 2 is a cylinder, and the upper and lower cross sections of the valve core 2 are consistent, thereby relatively increasing the height of the valve core 2, and the height of the coil 12 is also increased accordingly, thereby increasing the electromagnetic attraction force. The upper end surface of the valve core 2 is provided with a chamfer 28 and a blind hole I 29, the chamfer 28 acts as a flow guide, and the blind hole I 29 is provided with a spring 11 abutting against the boss II 16. The lower end surface of the valve core 2 is provided with a blind hole II 30, which is filled with sealing glue and is one-piece formed, thereby preventing sliding and improving stability.

[0039] In Example 2, further optimization is made on the basis of Example 1. In this embodiment, as Figure 3As shown, the valve body 1 is provided with a cable groove 36 communicating the upper cavity and the lower cavity, and the cable groove 36 is a long groove. The lower cavity of the valve body 1 is provided with a drainage passage 21 and a mounting groove for positioning the sensor assembly at the drainage hole 8. Preferably, the drainage passage 21 is provided with a circular groove at the drainage hole 8, and the circular groove and the drainage passage 21 ensure the flowability of the condensed water in the lower cavity. The mounting groove is communicated with the cable groove 36, and the connecting wire of the sensor assembly is conveniently led out. The mounting groove includes a mounting groove I 22 and a mounting groove II 23, and the mounting groove I 22 and the mounting groove II 23 are arranged on one side of the drainage passage 21; wherein the groove depth of the mounting groove I 22 is greater than that of the mounting groove II 23, and the mounting groove I 22 is communicated with the other side of the drainage passage 21 across the circular groove, so as to conveniently position the sensor assembly, and the mounting position is reasonable and convenient for assembly.

[0040] On the basis of the above-mentioned embodiments, as a preferred embodiment, the sensor assembly includes a pressure sensor 24 and a temperature sensor 25, the pressure sensor 24 is arranged in the mounting groove I 22 and faces the drainage hole 8, the condensed water directly impacts the pressure sensor 24 through the drainage hole 8, the airway is unobstructed, the signal transmission is more stable, and the sensitivity of the pressure sensor 24 is improved. The temperature sensor 14 is arranged in the mounting groove II 23 in a matched mode, the temperature sensor 25 corresponds to the heating film 13, the temperature sensor 25 is conveniently connected with the heating film 13; the temperature sensor 25 plays a role of a temperature control switch, so as to control the opening and closing of the heating film 13. The side surface of the valve body 1 is provided with a light hole 37 for guiding the connecting wire, and the light hole 37 is arranged on one side of the cable groove 36 in a corresponding mode, so as to conveniently lead out the connecting wire in the valve body 1 from the light hole 37, and then the connecting wire is fixed by sealing with sealing glue.

[0041] In example 3, the lower end cover 4 is threadedly connected to the outlet of the valve body 1, so as to ensure the stable connection of the lower end cover 4 and the valve body 1. The top of the lower end cover 4 is provided with a small circular boss 26, and the sensor assembly is top-fixed in the lower cavity through the small circular boss 26, so as to conveniently install. The small circular boss 26 and the top surface of the lower end cover 4 form a ring groove 27, and the water outlet hole 6 is arranged on the ring groove 27 in a penetrating mode, so as to have a simple structure and strong flowability. Preferably, the bottom surface of the lower end cover 4 is symmetrically provided with a process hole with the air outlet hole 6, and the process hole is used for connecting and tightening the lower end cover 4 and the valve body 1.

[0042] On the basis of the above-mentioned embodiments, as a preferred embodiment, the heating film 13 is arranged on the inner wall of the upper cavity of the valve body 1 in a surrounding mode, so as to ensure that the valve body 1 is sufficiently heated. The bottom of the upper cavity of the valve body 1 is provided with an inner ring groove 35, and the inner ring groove 35 forms an annular gap between the heating film 13 and the inner wall of the valve body 1, so as to increase the installation space and avoid the problem of electric leakage caused by the interference between the lead terminal of the heating film 13 and the coil 12.

[0043] The working process of the utility model is as follows:

[0044] When the air brake system is draining, the coil 12 is energized to generate a magnetic force, the valve core 2 overcomes the spring 11 elastic force and moves upward to open the drainage hole 8 of the conical boss 7 in the valve body 1, the condensed water accumulated at the bottom of the air reservoir flows through the water inlet hole 5 of the upper end cover 3, the arc-shaped drainage groove 19 of the valve core 2, the drainage hole 8 on the conical boss 7, the ring groove 27 of the lower end cover 4, and finally through the water outlet hole 6 in the ring groove 27 to drain to the atmosphere. At the same time when the drainage airflow passes through the drainage hole 8 of the conical boss 7, it impacts the surface of the opposite pressure sensor 24, and after the pressure sensor 24 is forced, it is converted into a resistance signal and transmitted to the control system, so that the driver can judge whether the air reservoir is draining normally. The temperature sensor 25 senses the change of the ambient temperature, when the ambient temperature is normal, the heating film 13 does not work, when the ambient temperature approaches zero, the temperature sensor 25 controls the heating film 13 to start heating, so as to avoid the condensed water from freezing and blocking the drainage channel.

[0045] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A drain valve, comprising a valve body (1), a valve core (2) disposed within the valve body (1), an upper end cap (3) disposed at the inlet end of the valve body (1), and a lower end cap (4) disposed at the outlet end, characterized in that: The upper end cap (3) and the lower end cap (4) are respectively provided with a water inlet hole (5) and a water outlet hole (6); the valve body (1) is provided with a conical boss (7), which divides the valve body (1) into an upper cavity and a lower cavity. The conical boss (7) is provided with a drain hole (8) that connects the upper cavity and the lower cavity; the upper cavity of the valve body (1) is provided with a spacer (9), the spacer (9) is provided with a valve core (2), the side wall of the valve core (2) is provided with an arc-shaped drain groove (10), one end of the valve core (2) is abutted against the water inlet hole (5) by a spring (11), and the other end is abutted against the drain hole (8). The spacer (9) is provided with a coil (12), and a heating film (13) is provided between the valve body (1) and the coil (12). A gap is left between the lower part of the heating film (13) and the valve body (1); the lower cavity of the valve body (1) is provided with a sensor assembly corresponding to the drain hole (8).

2. The drain valve according to claim 1, characterized in that: The upper end cover (3) is provided with an external thread II, and a sealing groove (34) is provided at the root of the external thread II. A sealing ring I (38) is provided in the sealing groove (34). The upper end cover (3) is threadedly connected to the inlet end of the valve body (1). The inner end face of the inlet of the valve body (1) is a chamfered surface (14), and the sealing ring I (38) seals with the chamfered surface (14). The valve body (1) is provided with an outer step on the outside, and an outer ring groove (31) is provided on the outer step. An O-ring (20) is provided in the outer ring groove (31).

3. The drain valve according to claim 2, characterized in that: The top of the upper cover (3) is provided with a boss I (15) for positioning the filter screen (17); the bottom of the upper cover (3) is provided with a boss II (16), and the boss II (16) and the bottom surface of the upper cover (3) form a groove; one end of the spacer (9) is inserted into the groove and the other end is sleeved on the conical boss (7), and an arc-shaped sealing structure is provided between the spacer (9) and the conical boss (7).

4. The drain valve according to claim 3, characterized in that: The bottom of the filter screen (17) is provided with a frustum base (18), which is bonded to the top surface of the upper end cover (3); the boss I (15) and the boss II (16) are respectively provided with cross drainage groove I (32) and cross drainage groove II (33), which are connected to the water inlet hole (5).

5. The drain valve according to claim 4, characterized in that: The arc-shaped sealing structure includes an arc-shaped annular groove (19) provided on the lower end face of the spacer (9), and a sealing ring II (39) is provided in the arc-shaped annular groove (19).

6. The drain valve according to claim 1, characterized in that: The valve body (1) is provided with a cable groove (36) that connects the upper cavity and the lower cavity. The lower cavity of the valve body (1) is provided with a drainage channel (21) and an installation groove located at the drainage hole (8). The installation groove is connected to the cable groove (36). The installation groove includes installation groove I (22) and installation groove II (23). The depth of installation groove I (22) is greater than that of installation groove II (23).

7. The drain valve according to claim 6, characterized in that: The sensor assembly includes a pressure sensor (24) and a temperature sensor (25). The pressure sensor (24) is installed in the mounting groove I (22) and faces the drain hole (8). The temperature sensor (25) is installed in the mounting groove II (23). The temperature sensor (25) corresponds to the heating film (13). A light hole (37) for guiding the connecting wire is opened on the side of the valve body (1). The light hole (37) is correspondingly set on one side of the cable groove (36).

8. The drain valve according to claim 1, characterized in that: The lower end cover (4) is threaded to the outlet of the valve body (1); the top of the lower end cover (4) is provided with a small round boss (26), and the sensor assembly is fixed in the lower cavity through the small round boss (26); the small round boss (26) and the top surface of the lower end cover (4) form an annular groove (27), and the water outlet (6) is provided through the annular groove (27).

9. The drain valve according to claim 1, characterized in that: The heating film (13) is arranged around the inner wall of the upper cavity of the valve body (1). The bottom of the upper cavity of the valve body (1) is provided with an inner ring groove (35). The inner ring groove (35) makes the heating film (13) and the inner wall of the valve body (1) form an annular gap.

10. The drain valve according to claim 1, characterized in that: The valve core (2) is a cylinder with the same upper and lower cross sections. The upper end face of the valve core (2) is provided with a chamfer (28) and a blind hole I (29). A spring (11) is provided in the blind hole I (29). The lower end face of the valve core (2) is provided with a blind hole II (30). Sealant is injected into the blind hole II (30).

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