A zero cold water check valve for a gas water heater and a working method thereof

Abstract

The present invention belongs to the technical field of electric water heaters, and relates to a zero cold water one-way valve for a gas water heater and a working method. The one-way valve comprises a left valve body end cover and a right valve body end cover. A left cavity is arranged inside the left valve body end cover, and a bottom of one side of the left cavity extends outward to form a water outlet. The right valve body end cover comprises a water inlet, an auxiliary cavity and a main cavity. The main cavity is arranged at the bottom of the auxiliary cavity, and one side of the main cavity extends outward to form a water inlet. If a cold water tap near the water outlet is turned on, P2 drops instantaneously, causing P to drop through a C hole, F3>FP, so that the auxiliary spring releases its stretching, and the auxiliary valve core moves, thereby driving a connecting rod to apply F2 to the main valve core through a lever principle, so that F2+F+FPG>F1, causing the one-way valve to self-close, water at the water inlet cannot flow to the water outlet, and the gas water heater does not work. With the replenishment of water in the cold water pipe, P2=P is gradually restored.

Description

Technical Field

[0001] The invention belongs to the technical field of electric water heaters and relates to a zero cold water one-way valve for a gas water heater and a working method. Background Art

[0002] The existing two-pipe zero cold water return function of the gas water heater is realized by switching through the forward conduction and reverse cutoff of the one-way valve, and the cold water pipe and the hot water pipe are connected by the one-way valve. Under normal circumstances, due to the characteristics of the one-way valve, the zero cold water is started, the water inlet end is enlarged under the action of the water pump, the one-way valve is pushed open, and the water is returned through the cold water pipe to achieve circulation heating. However, when using cold water without turning on the water heater, such as turning on the cold water faucet, using the toilet, etc., the water outlet end drops instantly due to pipe pressure and water resistance, causing the force generated from the water inlet end to the water outlet end to be greater than the spring force, resulting in the wrong start of the water heater (because the hot gas water heater is water flow started). Using an ordinary one-way valve to switch can solve the above problems to a certain extent, but it will cause the water heater to start incorrectly, seriously affecting the user experience; at the same time, multiple and frequent short and instantaneous starts affect the product life. Summary of the invention

[0003] The object of the present invention is to provide a zero cold water one-way valve for a gas water heater and a working method thereof, so as to solve the problem in the prior art that the gas water heater is mistakenly started by using cold water.

[0004] A zero cold water one-way valve for a gas water heater, comprising a left valve body end cover and a right valve body end cover, wherein a left cavity is arranged inside the left valve body end cover, and the bottom of one side of the left cavity extends outward to form a water outlet, and the right valve body end cover comprises a water inlet, an auxiliary cavity and a main cavity, wherein the main cavity is arranged at the bottom of the auxiliary cavity, and one side of the main cavity extends outward to form a water inlet;

[0005] The left valve body end cover is fixed to the right valve body end cover by screws, the auxiliary cavity is connected to the top space of the left cavity, the main cavity is connected to the bottom space of the left cavity, the water outlet and the water inlet are respectively located on both sides of the zero cold water one-way valve, on the same horizontal plane and connected through the left cavity and the main cavity;

[0006] An auxiliary valve core and a main valve core are respectively arranged inside the auxiliary cavity and inside the main cavity, an auxiliary spring and a main spring are respectively arranged in the length direction of the auxiliary valve core and in the length direction of the main valve core, a fixed guide plate is arranged at the connecting point between the auxiliary cavity and the left cavity, and at the connecting point between the main cavity and the left cavity, a valve core channel and a plurality of flow channel holes are arranged on the fixed guide plate, a first end of the auxiliary valve core and a first end of the main valve core respectively pass through their corresponding valve core channels, a partition extending outwardly along the circumference of the auxiliary valve core is arranged in the center of the auxiliary valve core, the partition divides the auxiliary cavity into two sub-cavities, and the auxiliary spring and the fixed guide plate are arranged on the opposite sides of the partition;

[0007] A limit block is provided at the second end of the main valve core, the limit block includes a wide end and a narrow end, the wide end is connected to the second end of the main valve core, and the narrow end is clamped on the water inlet end, and the main spring is provided between the fixed guide plate and the wide end of the limit block;

[0008] A connecting rod is arranged in the left cavity, and two ends of the connecting rod are respectively connected to the first end of the auxiliary valve core and the first end of the main valve core.

[0009] Preferably, the plurality of flow channel holes are symmetrically arranged with respect to the valve core channel.

[0010] Preferably, the fixed guide plate is fixed to the right valve body end cover by screws.

[0011] Preferably, a sealing ring is provided at the connection between the left valve body end cover and the right valve body end cover.

[0012] Preferably, a sealing ring is provided at the contact point between the partition and the inner wall of the auxiliary cavity.

[0013] Preferably, an exhaust hole is provided on the right valve body end cover, and the exhaust hole is connected to the sub-cavity in the auxiliary cavity where the auxiliary spring is provided.

[0014] Preferably, the connecting rod is a lever structure, and both ends of the connecting rod are two force arms of the lever.

[0015] Preferably, the right valve body end cover comprises a partition wall, which is provided between the auxiliary cavity and the main cavity for separating the two, and one end of the partition wall close to the left cavity extends outward to form a lever fulcrum.

[0016] Preferably, the middle portion of the connecting rod is hinged to the lever fulcrum.

[0017] A working method of a zero cold water check valve for a gas water heater, using the zero cold water check valve for a gas water heater, the gas water heater is a double-pipe zero cold water gas water heater without a return pipe, the flow channel hole of the fixed guide plate at the connection between the auxiliary cavity and the left cavity is set as a C hole, the flow channel hole of the fixed guide plate at the connection between the main cavity and the left cavity is set as an E hole, the water outlet pressure is P2, the water inlet pressure is P1, the sub-cavity pressure in the auxiliary cavity without an auxiliary spring is P, the pressure of the main cavity is PG, the spring force of the main spring is F, the spring force of the auxiliary spring is F3, the force applied by P1 at the limit block is F1, the force applied by P at the partition is FP, the force applied by PG at the limit block is FPG, and the force applied by the connecting rod to the main valve core is F2;

[0018] The working method of the zero cold water check valve of the gas water heater includes the following steps:

[0019] S1. After the gas water heater is turned on, if the double-pipe zero cold water is not used, the gas water heater will not work. The relationship P2=P is kept constant through the C hole, and the relationship P2=PG is kept constant through the E hole, so that FP and F3 are in a balanced state. At this time, F+FPG>F1, so the main valve core does not produce any displacement, and the connecting rod will not drive the auxiliary valve core to move. According to the principle of the one-way valve, the water circuit is reversely cut off;

[0020] S2. When double-pipe zero cold water is needed, the gas water heater starts to work. Under the action of the circulating water pump of the gas water heater, P1 rises, causing F1 to increase, P2=P, F1>F+FPG+F2, that is, F1 is large enough to overcome the force applied by F2 on the limit block, drive the main valve core to move, and overcome the force of F3 preventing the movement of the connecting rod. The connecting rod compresses the auxiliary spring, drives the auxiliary valve core to move, the one-way valve is opened, and water flows to the water outlet through the E hole, causing P2 to increase. Subsequently, the pressure and force of each part reach a new balance point, forming a heating circulation water circuit. At this time, double-pipe zero cold water can be used continuously;

[0021] S3. After the gas water heater stops working, when the double-pipe zero cold water is not used, if the cold water tap near the water outlet is turned on, P2 drops instantly, causing P to drop through the C hole, F3>FP, releasing the auxiliary spring and stretching it, causing the auxiliary valve core to move, thereby driving the connecting rod to apply F2 to the main valve core through the lever principle, making F2+F+FPG>F1, causing the one-way valve to self-close, and the water at the water inlet end cannot flow to the water outlet end, so that the gas water heater does not work. As the cold water pipe is replenished with water, it gradually recovers to P2=P.

[0022] Compared with the prior art, the present invention has the following advantages: it can continue to supply water normally when using zero cold water; when the gas water heater is shut down, even if cold water is used, it will not cause the gas water heater to start up by mistake; the internal structure is simple and reliable, and it is convenient for users to use it for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a cross-sectional view of the present invention;

[0024] The reference numerals include: 1-lever fulcrum, 2-left cavity, 3-connecting rod, 4-partitioning part, 5-auxiliary spring, 6-auxiliary valve core, 7-left valve body end cover, 8-fixed guide plate, 9-main spring, 10-main valve core, 11-right valve body end cover, 12-limiting block, 13-water inlet end, 14-water outlet end, 15-exhaust hole, 16-main cavity, 17-auxiliary cavity, 18-flow channel hole, 19-partitioning wall. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with specific embodiments:

[0026] A zero cold water check valve for a gas water heater, comprising a left valve body end cover 7 and a right valve body end cover 11, wherein a left cavity 2 is arranged inside the left valve body end cover 7, and a bottom of one side of the left cavity 2 extends outward to form a water outlet 14, and the right valve body end cover 11 comprises a water inlet 13, an auxiliary cavity 17 and a main cavity 16, wherein the main cavity 16 is arranged at the bottom of the auxiliary cavity 17, and a side of the main cavity 16 extends outward to form a water inlet 13;

[0027] The left valve body end cover 7 is fixed to the right valve body end cover 11 by screws, the auxiliary cavity 17 is connected to the top space of the left cavity 2, the main cavity 16 is connected to the bottom space of the left cavity 2, the water outlet 14 and the water inlet 13 are respectively located on both sides of the zero cold water one-way valve, on the same horizontal plane and connected through the left cavity 2 and the main cavity 16;

[0028] An auxiliary valve core 7 and a main valve core 10 are respectively arranged inside the auxiliary cavity 17 and inside the main cavity 16, an auxiliary spring 5 and a main spring 9 are respectively arranged in the length direction of the auxiliary valve core 7 and in the length direction of the main valve core 10, a fixed guide plate 8 is arranged at the connecting point between the auxiliary cavity 17 and the left cavity 2, and at the connecting point between the main cavity 16 and the left cavity 2, a valve core channel and a plurality of flow channel holes 18 are arranged on the fixed guide plate 8, a first end of the auxiliary valve core 7 and a first end of the main valve core 10 respectively pass through their respective corresponding valve core channels, a partition 4 extending outwardly along the circumference of the auxiliary valve core 7 is arranged in the center of the auxiliary valve core 7, the partition 4 divides the auxiliary cavity 17 into two sub-cavities, and the auxiliary spring 5 and the fixed guide plate 8 are arranged on the opposite side of the partition 4;

[0029] A limit block 12 is provided at the second end of the main valve core 10, and the limit block 12 includes a wide end and a narrow end, the wide end is connected to the second end of the main valve core 10, and the narrow end is clamped on the water inlet end 13, and the main spring 9 is provided between the fixed guide plate 8 and the wide end of the limit block 12;

[0030] A connecting rod 3 is provided in the left cavity 2 , and two ends of the connecting rod 3 are respectively connected to a first end of the auxiliary valve core 7 and a first end of the main valve core 10 .

[0031] The plurality of flow channel holes 18 are symmetrically arranged with respect to the valve core channel.

[0032] The fixed guide plate 8 is fixed to the right valve body end cover 11 by screws.

[0033] A sealing ring is provided at the connection between the left valve body end cover 7 and the right valve body end cover 11 .

[0034] A sealing ring is provided at the contact point between the partition 4 and the inner wall of the auxiliary cavity 17 .

[0035] The right valve body end cover 11 is provided with an exhaust hole 15 , and the exhaust hole 15 is connected to the sub-cavity in the auxiliary cavity 17 where the auxiliary spring 5 is provided.

[0036] The connecting rod 3 is a lever structure, and the two ends of the connecting rod 3 are two lever arms.

[0037] The right valve body end cover 11 includes a partition wall 19 , which is disposed between the auxiliary cavity 17 and the main cavity 16 to separate the two. One end of the partition wall 19 close to the left cavity 2 extends outward to form a lever fulcrum 1 .

[0038] The middle part of the connecting rod 3 is hinged to the lever fulcrum 1 .

[0039] A working method of a zero cold water check valve for a gas water heater, using the zero cold water check valve for a gas water heater, the gas water heater is a double-pipe zero cold water gas water heater without a return pipe, the flow channel hole 18 of the fixed guide plate 8 at the connection between the auxiliary cavity 17 and the left cavity 2 is set as a C hole, the flow channel hole 18 of the fixed guide plate 8 at the connection between the main cavity 16 and the left cavity 2 is set as an E hole, the pressure at the water outlet 14 is P2, the pressure at the water inlet 13 is P1, the sub-cavity pressure in the auxiliary cavity 17 without the auxiliary spring 5 is P, the pressure of the main cavity 16 is PG, the spring force of the main spring 9 is F, the spring force of the auxiliary spring 5 is F3, the force applied by P1 at the limit block 12 is F1, the force applied by P at the partition 4 is FP, the force applied by PG at the limit block 12 is FPG, and the force applied by the connecting rod 3 to the main valve core 10 is F2;

[0040] The working method of the zero cold water check valve of the gas water heater includes the following steps:

[0041] S1. After the gas water heater is turned on, if the double-pipe zero cold water is not used, that is, the gas water heater is not started, the relationship P2=P is kept constant through the C hole, and the relationship P2=PG is kept constant through the E hole, so that FP and F3 are in a balanced state. At this time, F+FPG>F1, so the main valve core 10 does not produce any displacement, and the connecting rod 3 will not drive the auxiliary valve core 7 to move. According to the principle of the one-way valve, the water circuit is reversely cut off;

[0042] S2. When double-pipe zero cold water is needed, the gas water heater is turned on. Under the action of the circulating water pump of the gas water heater, P1 rises, causing F1 to increase, P2=P, F1>F+FPG+F2, that is, F1 is large enough to overcome the force applied by F2 on the limit block 12, drive the main valve core 10 to produce displacement, and overcome the force of F3 preventing the movement of the connecting rod 3. The connecting rod 3 compresses the auxiliary spring 5, drives the auxiliary valve core 7 to move, and the one-way valve is opened. Water flows to the water outlet 14 through the E hole, causing P2 to increase. Subsequently, the pressure and force of each part reach a new balance point, forming a heating circulation water circuit. At this time, the double-pipe zero cold water can be used continuously, that is, the faucet that provides hot water can be turned on and hot water can be used continuously;

[0043] S3. After the gas water heater stops working, when the double-pipe zero cold water is not used, that is, the faucet that can provide hot water is not used, if the cold water faucet near the water outlet 14 is turned on, for example, when flushing the toilet, P2 drops instantly, causing P to drop through the C hole, F3>FP, so that the auxiliary spring 5 releases the stretch, and the auxiliary valve core 7 moves, thereby driving the connecting rod 3 to apply F2 to the main valve core 10 through the lever principle, so that F2+F+FPG>F1, causing the one-way valve to self-close, and the water at the water inlet end 13 cannot flow to the water outlet end 14, and the gas water heater does not work. With the replenishment of water in the cold water pipe, P2=P is gradually restored.

[0044] The elastic device of the auxiliary cavity 17 is not limited to a spring, and other elastic devices may be used. The water connection may be a direct connection or an indirect connection with an adapter, and a solenoid valve may be used to replace the control component in the present invention.

[0045] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A zero cold water check valve for a gas water heater, characterized in that: It includes a left valve body end cover and a right valve body end cover, wherein a left cavity is provided inside the left valve body end cover, and the bottom of one side of the left cavity extends outward to form a water outlet, and the right valve body end cover includes a water inlet, an auxiliary cavity and a main cavity, wherein the main cavity is provided at the bottom of the auxiliary cavity, and one side of the main cavity extends outward to form a water inlet; The left valve body end cover is fixed to the right valve body end cover by screws, the auxiliary cavity is connected to the top space of the left cavity, the main cavity is connected to the bottom space of the left cavity, the water outlet and the water inlet are on the same horizontal plane, respectively on both sides of the zero cold water one-way valve and are connected through the left cavity and the main cavity; An auxiliary valve core and a main valve core are respectively arranged inside the auxiliary cavity and inside the main cavity, an auxiliary spring and a main spring are respectively arranged in the length direction of the auxiliary valve core and in the length direction of the main valve core, a fixed guide plate is arranged at the connecting point between the auxiliary cavity and the left cavity, and at the connecting point between the main cavity and the left cavity, a valve core channel and a plurality of flow channel holes are arranged on the fixed guide plate, a first end of the auxiliary valve core and a first end of the main valve core respectively pass through their corresponding valve core channels, a partition extending outwardly along the circumference of the auxiliary valve core is arranged in the center of the auxiliary valve core, the partition divides the auxiliary cavity into two sub-cavities, and the auxiliary spring and the fixed guide plate are arranged on the opposite sides of the partition; A limit block is provided at the second end of the main valve core, the limit block includes a wide end and a narrow end, the wide end is connected to the second end of the main valve core, and the narrow end is clamped on the water inlet end, and the main spring is provided between the fixed guide plate and the wide end of the limit block; A connecting rod is arranged in the left cavity, and two ends of the connecting rod are respectively connected to the first end of the auxiliary valve core and the first end of the main valve core.

2. The zero cold water one-way valve for gas water heater according to claim 1, characterized in that: The plurality of flow channel holes are symmetrically arranged with respect to the valve core channel.

3. The zero cold water one-way valve for gas water heater according to claim 2, characterized in that: The fixed guide plate is fixed to the right valve body end cover by screws.

4. The zero cold water one-way valve for gas water heater according to claim 3, characterized in that: A sealing ring is provided at the connection between the left valve body end cover and the right valve body end cover.

5. The zero cold water one-way valve for gas water heater according to claim 4, characterized in that: A sealing ring is arranged at the contact point between the partition part and the inner wall of the auxiliary cavity.

6. The zero cold water one-way valve for gas water heater according to claim 5, characterized in that: An exhaust hole is arranged on the right valve body end cover, and the exhaust hole is communicated with a sub-cavity in the auxiliary cavity where an auxiliary spring is arranged.

7. The zero cold water one-way valve for gas water heater according to claim 6, characterized in that: The connecting rod is a lever structure, and the two ends of the connecting rod are respectively two force arms of the lever.

8. The zero cold water one-way valve for gas water heater according to claim 7, characterized in that: The right valve body end cover comprises a partition wall, which is arranged between the auxiliary cavity and the main cavity for separating the two. One end of the partition wall close to the left cavity extends outward to form a lever fulcrum.

9. The zero cold water one-way valve for gas water heater according to claim 8, characterized in that: The middle part of the connecting rod is hinged to the lever fulcrum.

10. A method for operating a zero cold water check valve of a gas water heater, characterized in that: A zero cold water one-way valve for a gas water heater according to any one of claims 1 to 9 is used, the gas water heater is a double-pipe zero cold water gas water heater without a return pipe, the flow channel hole of the fixed guide plate at the connection between the auxiliary cavity and the left cavity is set as a C hole, the flow channel hole of the fixed guide plate at the connection between the main cavity and the left cavity is set as an E hole, the pressure at the water outlet is P2, the pressure at the water inlet is P1, the pressure of the sub-cavity without an auxiliary spring in the auxiliary cavity is P, the pressure of the main cavity is PG, the spring force of the main spring is F, the spring force of the auxiliary spring is F3, the force applied by P1 at the limit block is F1, the force applied by P at the partition is FP, the force applied by PG at the limit block is FPG, and the force applied by the connecting rod to the main valve core is F2; The working method of the zero cold water check valve of the gas water heater includes the following steps: S1. After the gas water heater is turned on, if the double-pipe zero cold water is not used, the gas water heater will not work. The relationship P2=P is kept constant through the C hole, and the relationship P2=PG is kept constant through the E hole, so that FP and F3 are in a balanced state. At this time, F+FPG>F1, so the main valve core does not produce any displacement, and the connecting rod will not drive the auxiliary valve core to move. According to the principle of the one-way valve, the water circuit is reversely cut off; S2. When double-pipe zero cold water is needed, the gas water heater starts to work. Under the action of the circulating water pump of the gas water heater, P1 rises, causing F1 to increase, P2=P, F1>F+FPG+F2, that is, F1 is large enough to overcome the force applied by F2 on the limit block, drive the main valve core to move, and overcome the force of F3 preventing the movement of the connecting rod. The connecting rod compresses the auxiliary spring, drives the auxiliary valve core to move, the one-way valve is opened, and water flows to the water outlet through the E hole, causing P2 to increase. Subsequently, the pressure and force of each part reach a new balance point, forming a heating circulation water circuit. At this time, double-pipe zero cold water can be used continuously; S3. After the gas water heater stops working, when the double-pipe zero cold water is not used, if the cold water tap near the water outlet is turned on, P2 drops instantly, causing P to drop through the C hole, F3>FP, releasing the auxiliary spring and stretching it, causing the auxiliary valve core to move, thereby driving the connecting rod to apply F2 to the main valve core through the lever principle, making F2+F+FPG>F1, causing the one-way valve to self-close, and the water at the water inlet end cannot flow to the water outlet end, so that the gas water heater does not work. As the cold water pipe is replenished with water, it gradually recovers to P2=P.

Images