A liquid heater

Abstract

The present invention relates to the technical field of liquid heaters, and specifically to a liquid heater; it comprises an end cover and a liquid inlet joint and a liquid outlet joint symmetrically connected on both sides of the end cover; the liquid inlet joint and the liquid outlet joint are connected to the lower surface of the end cover; the end cover is electrically connected to the positive and negative electrodes of the heating wire, a leakage protector and a liquid level sensor; a straight-through pipe is provided at the center of the lower surface of the end cover and is connected to the liquid inlet joint; the lower position of the outer wall of the end cover is locked with a fixing sleeve by a locking ring; the upper end of the fixing sleeve is in sealing contact with the lower surface of the end cover; the present invention realizes the volume adjustment process of the liquid heater by controlling the container tube to move along the outer wall of the fixing sleeve, and locking the container tube and the fixing sleeve with bolts. Compared with the fixed volume of the existing liquid heaters, the liquid heater of the present invention has stronger versatility.

Description

Technical Field

[0001] The invention relates to the technical field of liquid heaters, in particular to a liquid heater. Background Art

[0002] A liquid heater is a device that heats liquid to a specific temperature. It plays a key role in many fields and provides a reliable and effective solution for liquid heating. Usually, when a liquid heater is working, the liquid enters the container tube along the liquid inlet pipe and flows from top to bottom along the straight pipe inside the container tube. After the liquid flows to the bottom of the container tube, it flows from bottom to top along the gap between the outer wall of the straight pipe and the inner wall of the container tube. The heating wire inside the container tube heats the liquid, so that the liquid flows out along the liquid outlet pipe after being heated.

[0003] Due to the limitation of their own size, the existing liquid heaters have a fixed volume for heating liquid. For some liquids with large heating requirements, the liquid heater with a smaller volume will restrict the entry of other liquids after being filled with liquid, thereby failing to meet the heating demand for increased liquid volume; for some liquids with small heating requirements, the larger container space in the liquid heater will make it difficult for the heated liquid to fill the space in the liquid heater, resulting in a waste of space and energy, and also making it difficult for the heated liquid to flow out in time; therefore, it is necessary to select a liquid heater with an appropriate volume before heating the liquid. It is not difficult to find that the existing liquid heaters have poor versatility and cannot meet the heating needs of liquids of different volumes. Summary of the invention

[0004] In order to make up for the shortcomings of the prior art, the present invention proposes a liquid heater. The present invention controls the container tube to move along the outer wall of the fixed sleeve and cooperates with bolts to lock the container tube and the fixed sleeve, thereby realizing the volume adjustment process of the liquid heater. Compared with the fixed volume of the existing liquid heaters, the liquid heater of the present invention is more versatile.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a liquid heater described in the present invention comprises an end cover and a liquid inlet joint and a liquid outlet joint symmetrically connected on both sides of the end cover; the liquid inlet joint and the liquid outlet joint are connected to the lower surface of the end cover; the end cover is electrically connected to the positive and negative electrodes of the heating wire, the leakage protector and the liquid level sensor; a straight-through pipe is arranged at the center of the lower surface of the end cover and connected to the liquid inlet joint; the lower position of the outer wall of the end cover is locked with a fixing sleeve through a locking ring; the upper end of the fixing sleeve is in sealing contact with the lower surface of the end cover; the upper and lower parts of the fixing sleeve are both open; the heating wire is located between the inner wall of the fixing sleeve and the outer wall of the straight-through pipe; a container tube is arranged on the outer wall of the fixing sleeve; bolts are passed through and threadedly connected to the upper positions of the inner and outer walls of the container tube; the bolts are pressed against the outer wall of the fixing sleeve when twisted; the lower end of the container tube is connected to the discharge joint; the container tube is locked by the bolt after moving along the axial direction of the fixing sleeve.

[0006] Preferably, the outer wall of the straight-through tube is movably sealed and connected to the extension tube; the lower end of the extension tube is connected to the grooved disk; the upper end of the heating wire is electrically connected to the end cover, and the lower end is connected to the upper surface of the grooved disk; the lower surface of the grooved disk is fixedly connected to the inner bottom wall of the container tube through a fixing rod; the grooved disk can pull the heating wire when moving away from the end cover.

[0007] Preferably, a socket is provided on the outer wall of the fixing sleeve; the diameter of the socket is adapted to the outer diameter of the output end of the bolt; there are multiple sockets; the multiple sockets are evenly and adjacently distributed in the axial direction of the fixing sleeve; and the output end of the bolt can be inserted into the socket.

[0008] Preferably, a slide groove is arranged on the outer wall of the fixing sleeve along the axial direction; the insertion hole is arranged at the bottom of the slide groove; a sliding block is slidably connected in the slide groove; and the bolt passes through the sliding block and is threadedly connected to the sliding block.

[0009] Preferably, an elastic member is provided in the socket; the elastic member can fill the socket after the bolt is removed; the elastic member can be squeezed open after the bolt is inserted into the socket; the elastic member is an elastic sponge.

[0010] Preferably, the upper end of the fixing sleeve is turned outward; the upper end of the fixing sleeve is connected to the upper end of the container tube by a tension spring; the tension spring is sleeved on the outer wall of the container tube; the container tube after being unlocked can move axially along the fixing sleeve with the cooperation of the tension spring.

[0011] Preferably, a protective sleeve is movably sleeved on the outer wall of the container tube; the upper end of the protective sleeve is fixedly connected to the upper end of the fixed sleeve; an escape groove is axially arranged on the outer wall of the protective sleeve; and the bolt passes through the escape groove.

[0012] Preferably, a spiral groove is provided on the outer wall of the straight-through tube; a movable block is movably connected in the spiral groove; the movable block is fixedly connected to the inner wall of the extension tube; the lower end of the extension tube is rotatably connected to the grooved disk; the heating wire is tightly attached to the inner wall of the fixed sleeve; the outer wall of the extension tube is fixedly connected to a spiral plate; the spiral plate is located on the inner side of the heating wire; the outer edge of the spiral plate is arranged close to the heating wire; the spiral direction of the spiral plate is opposite to that of the spiral groove; when the container tube moves away from the end cover, the rotation of the spiral plate will inhibit the outflow of liquid from the container tube.

[0013] The beneficial effects of the present invention are as follows:

[0014] 1. The present invention controls the container tube to move along the outer wall of the fixed sleeve and locks the container tube and the fixed sleeve with bolts, thereby realizing the volume adjustment process of the liquid heater. Compared with the fixed volume of the existing liquid heater, the liquid heater of the present invention is more versatile.

[0015] 2. The liquid heater in the present invention has multiple usage forms. For some liquids with varying amounts of heating to be heated, the container tube needs to be unlocked so that the volume of the liquid heater changes with the amount of heating of the liquid to be heated. For some liquids with a constant amount of heating to be heated, the container tube needs to be locked so that the liquid heater can heat the liquid at a constant volume to meet different types of usage requirements.

[0016] 3. The rotation of the spiral plate in the present invention is equivalent to the auger in the screw extruder. The fluid between the inner wall of the container tube and the inner wall of the extension tube flows from bottom to top, and the rotation direction of the spiral plate will make the flow direction of the fluid from top to bottom, which can suppress the outflow speed of the liquid in the expanded liquid heater. In this way, the liquid in the liquid heater can flow out only after sufficient heating time, thereby ensuring the liquid heating effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described below in conjunction with the accompanying drawings and implementation modes.

[0018] Figure 1 is a stereogram of the present invention;

[0019] Figure 2 is a position diagram of the avoidance groove of the present invention;

[0020] Figure 3 is a cross-sectional view of the present invention;

[0021] Figure 4 yes Figure 3 The enlarged view of point A in the middle;

[0022] Figure 5 yes Figure 3 The enlarged view of point B in the middle;

[0023] Figure 6It is a stereogram of the spiral plate in the present invention.

[0024] In the figure: end cover 1, liquid inlet joint 11, liquid outlet joint 12, straight pipe 2, spiral groove 21, movable block 22, locking ring 3, fixing sleeve 4, heating wire 41, jack 42, slide groove 43, slider 44, elastic member 45, tension spring 46, container tube 5, bolt 51, discharge joint 52, extension tube 6, grooved plate 61, fixing rod 62, spiral plate 63, protective sleeve 7, avoidance groove 71. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0026] like Figures 1 to 6 As shown, the present invention includes the following embodiments:

[0027] Embodiment 1: A liquid heater comprises an end cover 1 and a liquid inlet joint 11 and a liquid outlet joint 12 symmetrically connected on both sides of the end cover 1; the liquid inlet joint 11 and the liquid outlet joint 12 are connected to the lower surface of the end cover 1; the end cover 1 is electrically connected to the positive and negative electrodes of the heating wire 41, the leakage protector and the liquid level sensor; a straight-through pipe 2 is arranged at the center of the lower surface of the end cover 1 and is connected to the liquid inlet joint 11; the lower position of the outer wall of the end cover 1 is locked with a fixing sleeve 4 through a locking ring 3; the upper end of the fixing sleeve 4 is in sealing contact with the lower surface of the end cover 1; the upper and lower ends of the fixing sleeve 4 are both open; the heating wire 41 is located between the inner wall of the fixing sleeve 4 and the outer wall of the straight-through pipe 2; a container tube 5 is arranged on the outer wall of the fixing sleeve 4; the bolt 51 is penetrated and threadedly connected to the upper position of the inner and outer walls of the container tube 5; the bolt 51 is pressed against the outer wall of the fixing sleeve 4 when twisted; the lower end of the container tube 5 is connected to the discharge joint 52; the container tube 5 is locked by the bolt 51 after moving along the axial direction of the fixing sleeve 4.

[0028] The outer wall of the straight-through tube 2 is movably sealed and connected to the extension tube 6; the lower end of the extension tube 6 is connected to the grooved disk 61; the upper end of the heating wire 41 is electrically connected to the end cover 1, and the lower end is connected to the upper surface of the grooved disk 61; the lower surface of the grooved disk 61 is fixedly connected to the inner bottom wall of the container tube 5 through a fixing rod 62; the grooved disk 61 can pull the heating wire 41 when it is moving away from the end cover 1.

[0029] Specifically, the locking ring 3 is in the shape of an internal threaded sleeve, which can be sleeved on the upper outer wall of the fixing sleeve 4, and the upper end of the fixing sleeve 4 is clamped and pressed against the lower surface of the end cover 1. The internal thread of the locking ring 3 is threadedly connected to the lower position of the outer wall of the end cover 1 to achieve the locking connection between the upper end of the fixing sleeve 4 and the lower position of the outer wall of the end cover 1. Before using the liquid heater, the staff connects the liquid inlet joint 11 and the liquid outlet joint 12 to the corresponding pipes, connects the positive and negative poles of the heating wire 41 on the end cover 1, the leakage protector and the liquid level sensor, and finally blocks the drain joint 52, and then starts to adjust the volume of the liquid heater according to the liquid heating demand;

[0030] When it is necessary to enlarge the container of the liquid heater, the bolt 51 is screwed in the reverse direction. The bolt 51 will be out of contact with the fixing sleeve 4 when screwed in the reverse direction, so that the container tube 5 and the fixing sleeve 4 are unlocked. Then the staff can hold the container tube 5 away from the end cover 1. The container tube 5 can move along the outer wall of the fixing sleeve 4 in the process of moving away from the end cover 1. The outer wall of the fixing sleeve 4 is movably and sealedly connected with the inner wall of the container tube 5. Therefore, the liquid on the inner side of the fixing sleeve 4 will not flow out along the gap between the outer wall of the fixing sleeve 4 and the inner wall of the container tube 5. In the process of the container tube 5 moving away from the end cover 1, the volume in the liquid heater will increase. In the process of the container tube 5 moving away from the end cover 1, the fixing rod 62 will be driven to move away from the end cover 1 synchronously. In the process of the fixing rod 62 moving away from the end cover 1, the grooved plate 61 will also be driven to move away from the end cover 1. The grooved plate 61 moves away from the end cover 1, the extension tube 6 will be driven to move on the outer wall of the straight tube 2, and the inner wall of the extension tube 6 is movably sealed and connected with the outer wall of the straight tube 2. After the extension tube 6 is away from the end cover 1, the liquid in the expanded liquid heater will also flow into the inner bottom of the container tube 5. In addition, the heating wire 41 will be pulled in the process of the grooved plate 61 moving away from the end cover 1, so that the heating wire 41 is pulled apart and dispersed. After the heating wire 41 is pulled, the input current in the heating wire 41 is increased synchronously, so that the power of the heating wire 41 matches the expanded liquid heater. Finally, the bolt 51 is screwed forward, so that the bolt 51 is against the outer wall of the fixing sleeve 4, and the fixing sleeve 4 and the container tube 5 are locked by friction, so that the liquid heater is expanded to the corresponding heating volume according to the use requirements and is locked, thereby completing the expansion process of the liquid heater;

[0031] When it is necessary to reduce the container of the liquid heater, the bolt 51 is screwed in the reverse direction away from the fixing sleeve 4, so that the fixing sleeve 4 and the container tube 5 are unlocked, and the container tube 5 is pushed to move on the outer wall of the fixing sleeve 4 and approach the end cover 1, so that the volume in the liquid heater is reduced. When the container tube 5 approaches the end cover 1, it will drive the fixing rod 62 and the grooved disk 61 to approach the end cover 1, and the grooved disk 61 will drive the extension tube 6 to move on the outer wall of the straight tube 2 and approach the end cover 1. When the grooved disk 61 approaches the end cover 1, the heating wire 41 will be refolded. The heating wire 41 has certain elasticity and toughness and can be pulled and folded. After the grooved disk 61 approaches the end cover 1, the current entering the heating wire 41 is simultaneously reduced, so that the power of the heating wire 41 is adapted to the liquid heater after the reduction. Finally, the bolt 51 is screwed in the forward direction, so that the fixing sleeve 4 and the container tube 5 are locked, and the reduction process of the liquid heater is completed.

[0032] After completing the volume adjustment of the liquid heater, the staff will control the liquid to be heated to be injected into the inner side of the straight tube 2 along the liquid inlet joint 11, and the liquid in the straight tube 2 will enter the extension tube 6 from the straight tube 2, and the liquid will flow from the lower end of the extension tube 6 to the inner bottom wall of the container tube 5, and the liquid will pass through the grooved plate 61 from the inner bottom wall of the container tube 5 to enter between the inner wall of the fixed sleeve 4 and the outer wall of the extension tube 6, and the heating wire 41 will heat the liquid under power, and the heated liquid will move up to enter between the outer wall of the straight tube 2 and the inner wall of the fixed sleeve 4, and finally be discharged along the liquid outlet joint 12; during the operation of the liquid heater, if it is necessary to adjust the volume of the liquid heater for the second time, there is no need to replace the liquid heater, and the volume of the liquid heater can be adjusted by controlling the container tube 5 to move along the fixed sleeve 4;

[0033] The present invention controls the container tube 5 to move along the outer wall of the fixing sleeve 4 and locks the container tube 5 and the fixing sleeve 4 with the bolt 51, thereby realizing the volume adjustment process of the liquid heater. Compared with the fixed volume of the existing liquid heater, the liquid heater of the present invention has stronger versatility.

[0034] Embodiment 2: The outer wall of the fixing sleeve 4 is provided with a socket 42; the diameter of the socket 42 is adapted to the outer diameter of the output end of the bolt 51; there are multiple sockets 42; the multiple sockets 42 are evenly and adjacently distributed in the axial direction of the fixing sleeve 4; the output end of the bolt 51 can be inserted into the socket 42.

[0035] The outer wall of the fixing sleeve 4 is provided with a slide groove 43 along the axial direction; the insertion hole 42 is arranged at the bottom of the slide groove 43; the slide block 44 is slidably connected in the slide groove 43; the bolt 51 passes through the slide block 44 and is threadedly connected with the slide block 44.

[0036] An elastic member 45 is disposed in the insertion hole 42 ; the elastic member 45 can fill the insertion hole 42 after the bolt 51 is removed; the elastic member 45 can be squeezed open after the bolt 51 is inserted into the insertion hole 42 ; the elastic member 45 is an elastic sponge.

[0037] Before the volume of the liquid heater needs to be adjusted, the bolt 51 is screwed in the reverse direction so that the output end of the bolt 51 moves out of the socket 42 and breaks away from the contact with the fixing sleeve 4, so that the fixing sleeve 4 and the container tube 5 are unlocked. After the output end of the bolt 51 moves out of the corresponding socket 42, the elastic sponge in the socket 42 will reset and block the socket 42 again to prevent the socket 42 from being blocked by surrounding impurities. Then, the container tube 5 is controlled to move on the outer wall of the fixing sleeve 4. During the movement of the container tube 5, the slider 44 will be driven to slide in the slide groove 43. Due to the existence of the slider 44 and the slide groove 43, the container tube 5 will not be separated from the fixing sleeve 4, and the container tube 5 can only move along the axial direction of the fixing sleeve 4. As the container tube 5 After the outer wall of the fixing sleeve 4 completes the movement, the slider 44 will drive the output end of the bolt 51 to align with the corresponding socket 42, and the bolt 51 will be turned forward, and the output end of the bolt 51 will enter the socket 42 to compress the elastic sponge in the socket 42. After the bolt 51 is inserted into the socket 42, the fixing sleeve 4 and the container tube 5 are better locked, so that the container tube 5 will not change after the volume adjustment of the liquid heater is completed. During the operation of the liquid heater after the volume adjustment is completed, the elastic sponge contacts and covers the output end of the bolt 51, so that there is a large friction between the output end of the bolt 51 and the elastic sponge, making it difficult for the bolt 51 to rotate, and making the adjusted volume of the liquid heater more stable.

[0038] Embodiment 3: The upper end of the fixing sleeve 4 is turned outward; the upper end of the fixing sleeve 4 is connected to the upper end of the container tube 5 via a tension spring 46; the tension spring 46 is sleeved on the outer wall of the container tube 5; after being unlocked, the container tube 5 can move axially along the fixing sleeve 4 with the cooperation of the tension spring 46.

[0039] The outer wall of the container tube 5 is movably sleeved with a protective sleeve 7; the upper end of the protective sleeve 7 is fixedly connected to the upper end of the fixed sleeve 4; the outer wall of the protective sleeve 7 is axially provided with an escape groove 71; the bolt 51 passes through the escape groove 71.

[0040] After the liquid heater is put into use, the bolt 51 is screwed in the opposite direction so that the bolt 51 is out of contact with the fixing sleeve 4, so that the container tube 5 and the fixing sleeve 4 are unlocked, and the liquid to be heated enters the straight tube 2 along the liquid inlet joint 11, and the liquid in the straight tube 2 enters the bottom of the container tube 5 along the extension tube 6, and the liquid at the bottom of the container tube 5 flows along the gap between the outer wall of the extension tube 6 and the inner wall of the container tube 5, and finally flows into the liquid outlet joint 12 along the gap between the outer wall of the straight tube 2 and the inner wall of the fixing sleeve 4, and finally flows out along the liquid outlet joint 12. In the case that the liquid flow rate entering the container tube 5 through the liquid inlet joint 11 is greater than the liquid flow rate discharged from the liquid outlet joint 12, the liquid pressure in the container tube 5 increases, and the liquid will squeeze the container tube 5 away from the end cover 1. In the process of moving away from the end cover 1, the container tube 5 will pull the tension spring 46, so that the liquid needs to overcome the tension of the tension spring 46 to push the container tube 5 away As the amount of liquid in the container tube 5 increases, the container tube 5 will move further away from the end cover 1. In the process of moving away from the end cover 1, the volume in the liquid heater will be expanded, and the power of the heating wire 41 will increase accordingly, thereby meeting the heating demand of the increased liquid in the container tube 5; when the flow rate entering the container tube 5 from the liquid inlet joint 11 is less than the flow rate discharged from the liquid outlet joint 12, the amount of liquid in the container tube 5 decreases, and the container tube 5 moves closer to the end cover 1 under the tension of the tension spring 46. After the container tube 5 approaches the end cover 1, the volume in the liquid heater will be reduced, and the power of the heating wire 41 will also decrease accordingly, thereby meeting the heating demand of the reduced liquid in the container tube 5. In this embodiment, the tension spring 46 pulls the container tube 5, so that the volume in the liquid heater can change in time with the change of the amount of liquid in the container tube 5, thereby meeting the heating demand of some liquids with a changed amount of liquid to be heated;

[0041] For some liquid heaters that require a fixed volume, the staff only needs to tighten the bolt 51 against the outer wall of the fixing sleeve 4 to lock the fixing sleeve 4 and the container tube 5, so that the volume in the container tube 5 cannot change, thereby locking the volume of the liquid heater;

[0042] The liquid heater of the present invention has multiple usage modes. For some liquids whose heating amount varies, the container tube 5 needs to be unlocked so that the volume of the liquid heater varies with the change of the heating amount of the liquid. For some liquids whose heating amount is constant, the container tube 5 needs to be locked so that the liquid heater can heat the liquid at a constant volume, thereby meeting different usage requirements.

[0043] The volume of the liquid heater is divided into a fixed volume and a variable volume: the variable volume is easily affected by the flow rate of the liquid inlet joint 11 and the liquid outlet joint 12. When the flow rate of the liquid inlet joint 11 decreases, the liquid in the liquid heater will flow out when the container tube 5 approaches the end cover 1; the fixed volume will not be affected by the flow rate of the liquid inlet head and the liquid outlet head. When the flow rate of the liquid inlet joint 11 decreases, the liquid in the liquid heater can be temporarily retained in the container tube 5 and will not be squeezed out by the container tube 5; the fixed volume heating wire 41 does not need to be pulled back and forth, has a longer service life, and is suitable for some inaccurate It can meet the precise liquid heating needs and will not be affected by the change of the amount of liquid to be heated. It has the characteristics of low heating precision and durability. The variable volume heating wire 41 is often pulled and contracted, resulting in a short service life. It is suitable for some precise liquid heating needs. The volume will be changed according to the liquid heating demand and then heated. It has the characteristics of high heating precision. Furthermore, for some heating flow rates with small changes, a fixed volume can be selected, and for heating flow rates with large changes, a variable volume can be selected. The two are not equivalent, and the variable volume cannot replace the fixed volume. Therefore, the use form of the liquid heater will be adjusted and selected according to the use needs.

[0044] Embodiment 4: The outer wall of the straight-through tube 2 is provided with a spiral groove 21; the movable block 22 is movably connected in the spiral groove 21; the movable block 22 is fixedly connected to the inner wall of the extension tube 6; the lower end of the extension tube 6 is rotatably connected to the grooved disk 61; the heating wire 41 is close to the inner wall of the fixed sleeve 4; the outer wall of the extension tube 6 is fixedly connected to the spiral plate 63; the spiral plate 63 is located on the inner side of the heating wire 41; the outer edge of the spiral plate 63 is arranged close to the heating wire 41; the spiral direction of the spiral plate 63 is opposite to that of the spiral groove 21; when the container tube 5 moves away from the end cover 1, the rotation of the spiral plate 63 will inhibit the outflow of liquid from the container tube 5.

[0045] When the liquid heater is in a variable volume state, after the amount of liquid in the container tube 5 increases, the container tube 5 will move away from the end cover 1, thereby increasing the volume of the liquid heater. The container tube 5 will drive the fixed rod 62 and the grooved plate 61 away from the end cover 1, and the grooved plate 61 will drive the extension tube 6 to move on the outer wall of the straight tube 2, and the extension tube 6 will drive the movable block 22 to move along the spiral groove 21, so that the extension tube 6 rotates, and the rotating extension tube 6 will drive the spiral plate 63 to rotate. The rotation process of the spiral plate 63 is equivalent to the auger in the screw extruder. The fluid between the inner wall of the container tube 5 and the inner wall of the extension tube 6 flows from bottom to top, and the direction of rotation of the spiral plate 63 will make the fluid The flow direction of the body is from top to bottom. Although it cannot change the overall flow direction of the fluid from bottom to top, it can suppress the outflow speed of the liquid in the expanded liquid heater. The liquid will be discharged only after the efficiency of the heating wire increases and heats the liquid. At the same time, the liquid in the liquid heater will not flow out until it has enough time to heat, thereby ensuring the liquid heating effect. After the amount of liquid in the container tube 5 is reduced, the container tube 5 will move against the end cover 1, and the spiral plate 63 will assist the liquid in the container tube 5 to flow out quickly during the rotation process, thereby avoiding excessive heating of the liquid under the heating of the heating wire 41 whose power cannot be reduced in time, thereby reducing the residence time of the liquid in the container tube.

[0046] It can be understood that the power change of the heating wire 41 requires a process. With the assistance of the spiral plate 63, a time buffer is provided for the power change of the heating wire 41, so that the outflow speed of the liquid is slowed down before the heating temperature is reached, and the liquid can flow out quickly after reaching the heating temperature, thereby improving the accuracy of liquid heating.

[0047] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0048] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A liquid heater, comprising an end cover and a liquid inlet joint and a liquid outlet joint symmetrically connected on both sides of the end cover; the liquid inlet joint and the liquid outlet joint are connected to the lower surface of the end cover; the positive and negative electrodes of the heating wire, the leakage protector and the liquid level sensor are electrically connected to the end cover; a straight-through pipe is provided at the center of the lower surface of the end cover in communication with the liquid inlet joint; characterized in that: The lower position of the outer wall of the end cover is locked with the fixing sleeve through a locking ring; the upper end of the fixing sleeve is in sealing contact with the lower surface of the end cover; the heating wire is located between the inner wall of the fixing sleeve and the outer wall of the straight-through pipe; the movable sealing sleeve on the outer wall of the fixing sleeve is provided with a container tube; the upper positions of the inner and outer walls of the container tube are penetrated and threadedly connected with bolts; the bolts are pressed against the outer wall of the fixing sleeve when twisted; the lower end of the container tube is connected to the drainage joint; the container tube is locked by the bolts after moving along the axial direction of the fixing sleeve; The outer wall of the straight-through tube is movably sealed and connected to the extension tube; the lower end of the extension tube is connected to the grooved disc; the upper end of the heating wire is electrically connected to the end cover, and the lower end is connected to the upper surface of the grooved disc; the lower surface of the grooved disc is fixedly connected to the inner bottom wall of the container tube through a fixing rod; the grooved disc can pull the heating wire when it is away from the end cover; The outer wall of the fixing sleeve is provided with a plug hole; the diameter of the plug hole is adapted to the outer diameter of the output end of the bolt; there are multiple plug holes; the multiple plug holes are evenly and adjacently distributed in the axial direction of the fixing sleeve; the output end of the bolt can be inserted into the plug hole.

2. A liquid heater according to claim 1, characterized in that: The outer wall of the fixing sleeve is provided with a slide groove along the axial direction; the insertion hole is arranged at the bottom of the slide groove; the slide block is slidably connected in the slide groove; the bolt passes through the slide block and is threadedly connected with the slide block.

3. A liquid heater according to claim 2, characterized in that: An elastic member is arranged in the insertion hole; the elastic member can fill the insertion hole after the bolt is removed; and the elastic member can be squeezed open after the bolt is inserted into the insertion hole.

4. A liquid heater according to claim 1, characterized in that: The upper end of the fixing sleeve is turned outward; the upper end of the fixing sleeve is connected to the upper end of the container tube via a tension spring; the tension spring is sleeved on the outer wall of the container tube; after being unlocked, the container tube can move axially along the fixing sleeve with the cooperation of the tension spring.

5. A liquid heater according to claim 4, characterized in that: The outer wall of the container tube is movably sleeved with a protective sleeve; the upper end of the protective sleeve is fixedly connected to the upper end of the fixed sleeve; the outer wall of the protective sleeve is axially provided with an avoidance groove; the bolt passes through the avoidance groove.

6. A liquid heater according to claim 4, characterized in that: The outer wall of the straight-through tube is provided with a spiral groove; a movable block is movably connected in the spiral groove; the movable block is fixedly connected to the inner wall of the extension tube; the lower end of the extension tube is rotatably connected to the grooved disk; the heating wire is tightly attached to the inner wall of the fixed sleeve; the outer wall of the extension tube is fixedly connected to the spiral plate; the spiral plate is located on the inner side of the heating wire; the outer edge of the spiral plate is arranged close to the heating wire; the spiral direction of the spiral plate is opposite to that of the spiral groove; when the container tube moves away from the end cover, the rotation of the spiral plate will inhibit the outflow of liquid from the container tube.

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