CN212107067U - a small water heater - Google Patents

Abstract

The utility model discloses a small water heater, comprising a water inlet pipe, a pressure-stabilizing valve, a flow regulating valve, a heating water tank and a water outlet pipe; the pressure-stabilizing valve comprises a valve body, and the valve body is provided with a valve seat, a valve core and a ventilation valve The valve body is communicated with the water inlet pipe and the flow regulating valve respectively; the valve seat is in close contact with the inner wall of the water inlet end of the valve body, and a gap is left between the valve seat and the inner wall of the water outlet end of the valve body; a water inlet chamber, the water inlet chamber is provided with a water inlet, and water flows from the water inlet end of the valve body to the water outlet end of the valve body through the water inlet chamber and the water inlet in sequence; the valve core comprises a sleeve and is sleeved on the sleeve One end of the sleeve is sleeved outside the valve seat, and the opening size of the water port is adjusted by driving the sleeve to move by hydraulic pressure; A vent hole is arranged in the vent piece; one end of the vent hole is communicated with the sleeve, and the other end of the vent hole is communicated with the outside of the valve body.

Description

a small water heater

technical field

The utility model relates to the technical field of water heaters, in particular to a small water heater.

Background technique

A water heater refers to a device that increases the temperature of cold water into hot water within a certain period of time through various physical principles. According to different principles, it can be divided into electric water heaters, gas water heaters, solar water heaters, magnetic energy water heaters, air energy water heaters, heating water heaters, etc. The heating water tank of the existing instant type small water heater is generally directly connected to the tap water pipe through the water inlet pipe, and the inflowing tap water is heated immediately through the heating water tank and then flows out from the water outlet pipe, without a voltage stabilizing device. However, the water pressure of the tap water provided by the water supply system is usually unstable. When the water pressure is too high, the water flow into the heating water tank is fast and the heating time is short, resulting in a low water temperature in the outlet pipe; when the water pressure is too low, the water entering the heating water tank The water flow speed is slow and the heating time is long, resulting in a high water temperature in the outlet pipe, which may easily lead to unstable heating of the water heater and affect the heating effect of the water heater.

Utility model content

The purpose of this utility model is to provide a small water heater, which can adjust the water flow rate adaptively according to the water pressure of the tap water, stabilize the water pressure provided by the external tap water, and can effectively improve the heating stability of the small water heater, so that the heated water temperature It is relatively stable and works well.

To achieve the above object, the utility model adopts the following technical solutions:

A small water heater, comprising a water inlet pipe, a pressure-stabilizing valve, a flow regulating valve, a heating water tank and a water outlet pipe arranged in sequence along the water flow direction; the pressure-stabilizing valve comprises a valve body, and valve seats are arranged in sequence along the water flow direction in the valve body , valve core and vent; both ends of the valve body are connected with the water inlet pipe and the flow regulating valve respectively; the valve seat is in close contact with the inner wall of the water inlet end of the valve body, and there is a gap between the valve seat and the inner wall of the water outlet end of the valve body; A water inlet cavity is arranged inside the valve seat, and a water inlet is arranged on the side wall of the water inlet chamber, and water flows from the water inlet end of the valve body to the water outlet end of the valve body through the water inlet chamber and the water inlet in sequence; the valve core includes a sleeve A cylinder and a spring sleeved in the sleeve; one end of the sleeve is tightly sleeved outside the valve seat, and the size of the opening of the water port is adjusted by driving the sleeve to move by water pressure; one end of the breather is slidably connected to the sleeve The other end of the vent is fixedly connected with the valve body; the vent is provided with a vent hole; one end of the vent hole is communicated with the inner cavity of the sleeve, and the other end of the vent hole is communicated with the outside of the valve body.

Preferably, the water inlet pipe includes a cold water pipe, a sleeve pipe and a connecting pipe; the upper end of the cold water pipe is communicated with the water inlet end of the valve body, and water inlets are respectively opened on both sides of the lower end of the cold water pipe; one end of the connecting pipe penetrates and is fixed to the sleeve On the connecting pipe, the other end of the connecting pipe is communicated with the tap water pipe; the sleeve pipe is tightly sleeved on the outside of the cold water pipe at the water inlet, and the connecting pipe is connected with one of the water inlets by rotating the sleeve pipe.

Preferably, the connecting pipe is provided with an impurity removing mechanism for intercepting impurities in water; the impurity removing mechanism includes an impurity removing pipe and an impurity removing plug; the impurity removing pipe is penetrated and fixed on the lower side of the connecting pipe; A filter screen is fixed on the upper end of the plug; the filter screen is inserted into the connecting pipe from bottom to top, and the impurity removing plug is threadedly connected with the impurity removing pipe.

Preferably, there is a space between the impurity removing plug and the connecting pipe, and the impurities intercepted by the filter screen are deposited in the impurity removing pipe above the impurity removing plug.

Preferably, the cold water pipe outside the water inlet is provided with a first sealing groove; the first sealing groove is provided with a first sealing ring; one side of the first sealing ring is tightly embedded in the first sealing groove, and its The other side is in close contact with the inner wall of the sleeve pipe; the impurity removal plug is provided with a second sealing groove; the second sealing groove is provided with a second sealing ring; one side of the second sealing ring is tightly embedded in the second sealing In the groove, the other side is close to the impurity removal pipe.

Preferably, a water discharge pipe is arranged in the cold water pipe; the upper end of the water discharge pipe is communicated with the water inlet end of the valve body, and the lower end of the water discharge pipe is communicated with the inner cavity of the cold water pipe; The water flows from the drain pipe to the pressure regulator valve.

Preferably, a third sealing ring is provided where the valve seat is in contact with the inner wall of the valve; a third sealing groove is provided on the valve seat; one side of the third sealing ring is tightly embedded in the third sealing groove, and its The other side is in close contact with the inner wall of the valve; the place where the valve seat is in contact with the inner wall of the sleeve is provided with a fourth sealing ring; the valve seat is provided with a fourth sealing groove; one side of the fourth sealing ring is tightly embedded In the fourth sealing groove, the other side is in close contact with the inner wall of the sleeve; the place where the sleeve is in contact with the vent is provided with a fifth sealing ring; the sleeve is provided with a fifth sealing groove; One side of the sealing ring is tightly embedded in the fifth sealing groove, and the other side of the sealing ring is in close contact with the breather.

Preferably, a plurality of reinforcing ribs are fixed at intervals on the inner wall of the valve body; the reinforcing ribs are located outside the sleeve.

Preferably, the heating water tank includes a water storage tank and a heating element disposed on the water storage tank, and the water in the water storage tank is heated by the heating element.

Preferably, the heating water tank is provided with a water level pipe for improving the water heating effect; the lower end of the water level pipe is fixed on the heating water tank, and the upper end of the water level pipe is located above the water outlet end of the flow regulating valve; the water outlet end of the flow regulating valve is connected to the storage The lower part of the water tank is communicated, the water outlet pipe is communicated with the lower end of the water level pipe, and the heated water is discharged from the water outlet pipe through the water level pipe.

After adopting the above-mentioned technical scheme, the utility model has the following beneficial effects:

1. The utility model is a small water heater. When the water flows into the water outlet of the valve body from the water inlet, the water accumulated in the water outlet of the valve body will produce a downward reverse pressure on the sleeve. When the water inlet pressure increases At the same time, the water flowing into the outlet end of the valve body also increases in pressure, and the water pressure pushes the sleeve downward to overcome the resistance of the spring to move toward the water inlet side, and the gas inside the sleeve is discharged from the vent hole, so that the sleeve will The opening of the water port is gradually closed to reduce the water flow to the water outlet end of the valve body; when the water flow to the water outlet end of the valve body is too small, under the action of the spring restoring force, the sleeve moves to the side away from the water inlet end of the valve body to make the sleeve The opening of the water port is gradually opened to increase the water flow to the water outlet of the valve body, and finally the dynamic balance between the water outlet pressure and the spring restoring force can be achieved. Improve the heating stability of the small water heater, so that the heated water temperature is relatively stable and the use effect is good.

2. The utility model is a small water heater. According to the actual installation needs, the connecting pipe can be installed on the left or right side by rotating the sleeve pipe. .

3. The utility model is a small water heater. The filter screen on the impurity removal plug can effectively intercept the impurities in the water, and the impurity removal plug is threadedly connected with the impurity removal pipe, which is convenient for quick disassembly or installation and convenient cleaning; A space is reserved between the connecting pipes, which can be used to precipitate impurities intercepted by the filter screen, which not only avoids clogging of the connecting pipes, but also facilitates the removal of impurities in a centralized manner.

4. The utility model is a small water heater. The first sealing ring and the second sealing ring can improve the sealing effect of the water inlet pipe, and the third sealing ring, the fourth sealing ring and the fifth sealing ring can improve the sealing effect of the pressure regulator valve. It can effectively improve the working stability of small water heaters.

5. The utility model is a small water heater, the reinforcing ribs can improve the strength of the valve body, can effectively reduce the impact of water pressure on the inner wall of the valve body, and reduce the deformation of the valve body due to the water pressure or even the tube burst.

6. The utility model is a small water heater. The water inlet of the water level pipe is located above the water outlet end of the flow regulating valve, so that water can be accumulated in the water storage tank from bottom to top, and the water can be effectively heated by the heating element and flow into the water level pipe from the upper end. The water inlet is finally discharged from the outlet pipe.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of the present utility model;

Fig. 2 is the explosion structure diagram of the present utility model;

Fig. 3 is the three-dimensional structure diagram of the water storage tank of the utility model;

Fig. 4 is the cutaway structure schematic diagram of the water inlet pipe, the pressure-stabilizing valve and the flow regulating valve of the utility model;

5 is a partial exploded view of the water inlet pipe of the present utility model;

6 is a partial enlarged view of the cold water pipe of the utility model;

Fig. 7 is the structural representation of the impurity removing plug and the filter screen of the utility model;

Fig. 8 is the cutaway structure schematic diagram of the water inlet pipe of the utility model;

Fig. 9 is the exploded structure diagram of the pressure-stabilizing valve of the utility model;

Fig. 10 is the cutaway structure schematic diagram of the pressure-stabilizing valve of the present invention;

11 is a schematic view of the cut structure of the pressure-stabilizing valve of the present utility model when it avoids cutting to a reinforcing rib;

Figure 12 is a schematic view of the cutaway structure of the pressure-stabilizing valve of the present invention when the valve core is not installed;

FIG. 13 is a schematic view of the cutaway structure of the pressure-stabilizing valve of the present invention when viewed from above.

The reference numbers in the figure are indicated as:

1. Water inlet pipe; 10. Cold water pipe; 100. Water inlet; 101. First sealing groove; 102. Drain pipe; 103. Solenoid valve; 11. Sleeve pipe; 131, impurity removal plug; 1310, the second sealing groove; 132, the filter screen; 14, the first sealing ring; 15, the second sealing ring; 2, the pressure regulator valve; 20, the valve body; 21, the valve seat; 210, water inlet chamber; 211, water inlet; 212, third sealing groove; 213, fourth sealing groove; 22, valve core; 220, sleeve; 2200, fifth sealing groove; 221, spring; 23, Ventilation piece; 230, ventilation hole; 24, third sealing ring; 25, fourth sealing ring; 26, fifth sealing ring; 27, reinforcing rib; 3, flow regulating valve; 4, heating water tank; 40, water storage tank; 41. Heating element; 42. Water level pipe; 5. Water outlet pipe.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model more clearly understood, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not intended to limit the present invention.

1 to 13, a small water heater includes a water inlet pipe 1, a pressure regulator valve 2, a flow regulating valve 3, a heating water tank 4 and a water outlet pipe 5, which are arranged in sequence along the water flow direction. The water inlet pipe 1, the pressure regulator The water flow paths in the valve 2 and the flow regulating valve 3 are shown as line B in Figure 4; the pressure regulator valve 2 includes a valve body 20, and the valve body 20 is provided with a valve seat 21 and a valve core in sequence along the water flow direction. 22 and a ventilation member 23; both ends of the valve body 20 are respectively connected with the water inlet pipe 1 and the flow regulating valve 3; There is a gap between the inner walls; a water inlet cavity 210 is arranged inside the valve seat 21, and a water inlet 211 is arranged on the side wall of the water inlet chamber 210. The water flows from the inlet end of the valve body 20 through the water inlet chamber 210 and the water inlet 211 flows into the water outlet end of the valve body 20; the valve core 22 includes a sleeve 220 and a spring 221 sleeved in the sleeve 220; one end of the sleeve 220 is tightly sleeved outside the valve seat 21 and driven by water pressure The sleeve 220 is moved to adjust the size of the opening of the water port 211; one end of the ventilation member 23 is slidably connected with the sleeve 220, and the other end of the ventilation member 23 is fixedly connected with the valve body 20; the ventilation member 23 is provided with a ventilation hole 230; One end of the vent hole 230 is communicated with the inner cavity of the sleeve 220 , and the other end of the vent hole 230 is communicated with the outside of the valve body 20 .

As shown in Figure 2, Figure 4, Figure 5 and Figure 8, the water inlet pipe 1 includes a cold water pipe 10, a sleeve pipe 11 and a connecting pipe 12; the upper end of the cold water pipe 10 is communicated with the water inlet end of the valve body 20, and the cold water pipe 10. There are water inlets 100 on both sides of the lower end respectively; one end of the connecting pipe 12 is fixed on the sleeve pipe 11, and the other end of the connecting pipe 12 is communicated with the tap water pipe; the sleeve pipe 11 is tightly sleeved on the cold water at the water inlet 100. Outside the pipe 10 , the connecting pipe 12 is communicated with one of the water inlets 100 by rotating the sleeve pipe 11 .

As shown in FIGS. 2 , 4 , 5 , 7 and 8 , the connecting pipe 12 is provided with an impurity removing mechanism 13 for intercepting impurities in water; the impurity removing mechanism 13 includes an impurity removing pipe 130 and an impurity removing mechanism 13 The plug 131; the impurity removing pipe 130 is penetrated and fixed on the lower side of the connecting pipe 12; the filter screen 132 is fixed on the upper end of the impurity removing plug 131; Threaded connection with cleaning pipe 130.

As shown in FIG. 6 , FIG. 7 and FIG. 8 , there is a space between the impurity removing plug 131 and the connecting pipe 12 , and the impurities intercepted by the filter screen 132 are deposited in the impurity removing pipe 130 above the impurity removing plug 131 .

As shown in FIG. 9 , FIG. 10 , FIG. 11 , FIG. 12 and FIG. 13 , the cold water pipe 10 outside the water inlet 100 is provided with a first sealing groove 101 ; the first sealing groove 101 is provided with a first sealing groove One side of the first sealing ring 14 is tightly embedded in the first sealing groove 101, and the other side is in close contact with the inner wall of the sleeve pipe 11; the impurity removing plug 131 is provided with a second sealing groove 1310; the A second sealing ring 15 is disposed on the second sealing groove 1310 ; one side of the second sealing ring 15 is tightly embedded in the second sealing groove 1310 , and the other side is closely attached to the impurity removing pipe 130 .

As shown in Figure 2, Figure 4, Figure 5, Figure 6 and Figure 8, the cold water pipe 10 is provided with a water discharge pipe 102; the upper end of the water discharge pipe 102 is connected to the water inlet end of the valve body 20, and the lower end of the water discharge pipe 102 The inner cavity of the cold water pipe 10 is connected; the cold water pipe 10 is provided with a solenoid valve 103, and the water in the cold water pipe 10 is controlled by the solenoid valve 103 to flow from the water discharge pipe 102 to the pressure-stabilizing valve 2; FIG. 8 shows the structure when the solenoid valve 103 is closed In the figure, line A is the water flow path.

As shown in FIG. 9 , FIG. 10 , FIG. 11 , FIG. 12 and FIG. 13 , a third sealing ring 24 is provided where the valve seat 21 is in contact with the inner wall of the valve body 20 ; a third sealing ring 24 is provided on the valve seat 21 groove 212; one side of the third sealing ring 24 is tightly embedded in the third sealing groove 212, and the other side is in close contact with the inner wall of the valve body 20; the place where the valve seat 21 contacts the inner wall of the sleeve 220 is provided with a fourth The sealing ring 25; the valve seat 21 is provided with a fourth sealing groove 213; one side of the fourth sealing ring 25 is tightly embedded in the fourth sealing groove 213, and the other side is closely attached to the inner wall of the sleeve 220; the A fifth sealing ring 26 is provided at the place where the sleeve 220 is in contact with the breather 23; a fifth sealing groove 2200 is provided on the sleeve 220; The other side is in close contact with the ventilation member 23 .

As shown in FIG. 11 , FIG. 12 and FIG. 13 , a plurality of reinforcing ribs 27 are fixed at intervals on the inner wall of the valve body 20 ; the reinforcing ribs 27 are located outside the sleeve 220 .

As shown in FIG. 1 , FIG. 2 and FIG. 5 , the heating water tank 4 includes a water storage tank 40 and a heating element 41 disposed on the water storage tank 40 , and the water in the water storage tank 40 is heated by the heating element 41 .

As shown in Figure 1, Figure 2 and Figure 3, the heating water tank 4 is provided with a water level pipe 42 for improving the water heating effect; the lower end of the water level pipe 42 is fixed on the heating water tank 4, and the upper end of the water level pipe 42 is located at the flow adjustment Above the water outlet end of the valve 3; the water outlet end of the flow regulating valve 3 is communicated with the lower part of the water storage tank 40, the water outlet pipe 5 is communicated with the lower end of the water level pipe 42, and the heated water is discharged from the water outlet pipe 5 through the water level pipe 42.

The working principle of the present utility model is as follows:

When the small water heater of the present invention is used, first place the first sealing ring 14 in the first sealing groove 101, and then set the sleeve pipe 11 outside the cold water pipe 10, according to the position of the water pipe reserved for the actual use site ( (not shown in the figure), the connecting pipe 12 is installed on the side that is convenient to be connected with the tap water pipe by rotating the sleeve pipe 11; then, the impurity removing plug 131 is installed on the impurity removing pipe 130 by rotating, so that the filter screen 132 is extended. Into the connecting pipe 12, the impurities in the water can be effectively intercepted and deposited in the impurity removal pipe 130 to facilitate centralized disassembly and cleaning; secondly, the filtered tap water flows into the cold water pipe 10 through the water inlet 100, and by opening the solenoid valve 103 The water in the cold water pipe 10 flows to the water inlet end of the valve body 20 through the water discharge pipe 102; then, the water in the water inlet end of the valve body 20 flows into the water outlet end of the valve body 20 from the water inlet cavity 210 and the water port 211, and accumulates in the valve body The water in the water outlet end of 20 will produce a downward reverse pressure on the sleeve 220. When the water inlet pressure increases, the water flowing to the water outlet end of the valve body 20 also increases in pressure, and the water pressure pushes the sleeve downward. 220 overcomes the resistance of the spring 221 to move to the side of the water inlet, and the gas inside the sleeve 220 is discharged from the vent hole 230, so that the sleeve 220 gradually closes the opening of the water port 211 to reduce the water flow to the water outlet of the valve body 20; When the water flow to the water outlet end of the valve body 20 is too small, under the restoring force of the spring 221, the sleeve 220 moves to the side away from the water inlet end of the valve body 20, so that the sleeve 220 gradually widens the opening of the water port 211 and increases the The water flow to the water outlet end of the valve body 20 finally realizes the dynamic balance between the water outlet pressure and the restoring force of the spring 221, and the water flow speed can be adjusted adaptively according to the water pressure of the tap water; finally, the water flow at the water outlet end of the valve body 20 flows into the water storage tank 40 through the flow regulating valve 3 , when the water is accumulated in the water storage tank 40 from bottom to top, the heating element 41 can effectively heat the water, and the heated hot water flows into the water inlet of the water level pipe 42 from the upper end, and finally is discharged from the water outlet pipe 5; The water heater can adaptively adjust the water flow speed according to the tap water pressure, stabilize the water pressure provided by the external tap water, which can effectively improve the heating stability of the small water heater, so that the heated water temperature is relatively stable, and the water inlet pipe 1 has strong versatility and good use effect. .

The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited to this. The changes or replacements should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (10)

1. A small-size water heater which characterized in that: comprises a water inlet pipe (1), a pressure stabilizing valve (2), a flow regulating valve (3), a heating water tank (4) and a water outlet pipe (5) which are arranged in sequence along the water flow direction; the pressure stabilizing valve (2) comprises a valve body (20), and a valve seat (21), a valve core (22) and a ventilation piece (23) are sequentially arranged in the valve body (20) along the water flow direction; two ends of the valve body (20) are respectively communicated with the water inlet pipe (1) and the flow regulating valve (3); the valve seat (21) is tightly attached to the inner wall of the water inlet end of the valve body (20), and a gap is reserved between the valve seat (21) and the inner wall of the water outlet end of the valve body (20); a water inlet cavity (210) is arranged inside the valve seat (21), a water through opening (211) is formed in the side wall of the water inlet cavity (210), and water flows into the water outlet end of the valve body (20) from the water inlet end of the valve body (20) through the water inlet cavity (210) and the water through opening (211) in sequence; the valve core (22) comprises a sleeve (220) and a spring (221) sleeved in the sleeve (220); one end of the sleeve (220) is tightly sleeved outside the valve seat (21), and the opening size of the water through opening (211) is adjusted by driving the sleeve (220) to move through water pressure; one end of the ventilation piece (23) is connected with the sleeve (220) in a sliding way, and the other end of the ventilation piece (23) is fixedly connected with the valve body (20); a vent hole (230) is arranged in the ventilation piece (23); one end of the vent hole (230) is communicated with the inner cavity of the sleeve (220), and the other end of the vent hole (230) is communicated with the outside of the valve body (20).

2. A small water heater as set forth in claim 1, wherein: the water inlet pipe (1) comprises a cold water pipe (10), a sleeve pipe (11) and a connecting pipe (12); the upper end of the cold water pipe (10) is communicated with the water inlet end of the valve body (20), and water inlets (100) are respectively formed in two sides of the lower end of the cold water pipe (10); one end of the connecting pipe (12) penetrates through and is fixed on the sleeve pipe (11), and the other end of the connecting pipe (12) is communicated with a tap water pipe; the sleeving pipe (11) is tightly sleeved outside the cold water pipe (10) at the water inlet (100), and the connecting pipe (12) is communicated with one water inlet (100) through the rotary sleeving pipe (11).

3. A small water heater as set forth in claim 2, wherein: an impurity removal mechanism (13) for intercepting impurities in water is arranged on the connecting pipe (12); the impurity removing mechanism (13) comprises an impurity removing pipe (130) and an impurity removing plug (131); the impurity removing pipe (130) penetrates through and is fixed at the lower side of the connecting pipe (12); a filter screen (132) is fixed at the upper end of the impurity removing plug (131); in filter screen (132) from the bottom up inserts connecting pipe (12), edulcoration stopper (131) and edulcoration pipe (130) threaded connection.

4. A small water heater as set forth in claim 3, wherein: a section of space is reserved between the impurity removal plug (131) and the connecting pipe (12), and impurities intercepted by the filter screen (132) are deposited in the impurity removal pipe (130) above the impurity removal plug (131).

5. A small water heater as set forth in claim 4, wherein: a first sealing groove (101) is formed in the cold water pipe (10) on the outer side of the water inlet (100); a first sealing ring (14) is arranged on the first sealing groove (101); one side of the first sealing ring (14) is tightly embedded into the first sealing groove (101), and the other side of the first sealing ring is tightly attached to the inner wall of the sleeve pipe (11); a second sealing groove (1310) is arranged on the impurity removing plug (131); a second sealing ring (15) is arranged on the second sealing groove (1310); one side of the second sealing ring (15) is tightly embedded into the second sealing groove (1310), and the other side of the second sealing ring is tightly attached to the impurity removing pipe (130).

6. A small water heater as set forth in claim 2, wherein: a water discharge pipe (102) is arranged in the cold water pipe (10); the upper end of the water discharge pipe (102) is communicated with the water inlet end of the valve body (20), and the lower end of the water discharge pipe (102) is communicated with the inner cavity of the cold water pipe (10); an electromagnetic valve (103) is arranged on the cold water pipe (10), and the electromagnetic valve (103) is used for controlling water in the cold water pipe (10) to flow to the pressure stabilizing valve (2) from the water discharging pipe (102).

7. A small water heater as set forth in claim 1, wherein: a third sealing ring (24) is arranged at the position where the valve seat (21) is contacted with the inner wall of the valve body (20); a third sealing groove (212) is formed in the valve seat (21); one side of the third sealing ring (24) is tightly embedded into the third sealing groove (212), and the other side of the third sealing ring is tightly attached to the inner wall of the valve body (20); a fourth sealing ring (25) is arranged at the position where the valve seat (21) is contacted with the inner wall of the sleeve (220); a fourth sealing groove (213) is formed in the valve seat (21); one side of the fourth sealing ring (25) is tightly embedded into the fourth sealing groove (213), and the other side of the fourth sealing ring is tightly attached to the inner wall of the sleeve (220); a fifth sealing ring (26) is arranged at the position where the sleeve (220) is contacted with the ventilation piece (23); a fifth sealing groove (2200) is formed in the sleeve (220); one side of the fifth sealing ring (26) is tightly embedded into the fifth sealing groove (2200), and the other side of the fifth sealing ring is tightly attached to the ventilation piece (23).

8. A small water heater as set forth in claim 1, wherein: a plurality of reinforcing ribs (27) are fixed on the inner wall of the valve body (20) at intervals; the reinforcing ribs (27) are positioned outside the sleeve (220).

9. A small water heater as set forth in claim 1, wherein: the heating water tank (4) comprises a water storage tank (40) and a heating element (41) arranged on the water storage tank (40), and water in the water storage tank (40) is heated through the heating element (41).

10. A small water heater as set forth in claim 9, wherein: a water level pipe (42) for improving the water heating effect is arranged in the heating water tank (4); the lower end of the water level pipe (42) is fixed on the heating water tank (4), and the upper end of the water level pipe (42) is positioned above the water outlet end of the flow regulating valve (3); the water outlet end of the flow regulating valve (3) is communicated with the lower part of the water storage tank (40), the water outlet pipe (5) is communicated with the lower end of the water level pipe (42), and the heated water is discharged from the water outlet pipe (5) through the water level pipe (42).

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