CN2588158Y - Anti-siphon device for safety valve of water heater - Google Patents

Abstract

The utility model relates to a safety valve for an energy storage type water heater. An anti-siphon device for a water heater safety valve, comprising a combined valve core bottom (2) in the safety valve and a safety valve body step (1) surrounding the combined valve core bottom, the combined valve core bottom and the safety valve body step are in surface contact or line contact and cooperate with each other, the bottom of the combined spool covers or enters the step of the safety valve body, and a throttle valve is formed at this time; a one-way valve. The utility model can prevent the hot water in the inner tank of the water heater from flowing to the water supply pipe through the contact and cooperation between the bottom of the combined valve core and the step of the safety valve body when the water supply system fails (siphon phenomenon occurs), and prevents water leakage from occurring.

Description

Anti-siphon device for safety valve of water heater

technical field

The utility model relates to a safety valve for an energy storage type water heater.

technical background

The existing internal leakage safety valve for energy storage water heaters consists of a combined valve body core, a pressure limiting release valve and a valve body shell. The combined valve body core includes a one-way valve piece, a sealing piece, a spring, a combined valve core and a pagoda spring. , as Chinese patent ZL 00264381.2 discloses a kind of " non-drip combined safety valve ". When the water supply pressure is greater than the tank pressure of the water heater (inner tank pressure for short), the entire combined valve body core moves upwards under the push of the water supply pressure P1 until the water supply pressure and the inner tank pressure P2 are balanced. Then the whole combined valve body core resets under the action of the spring. As the water in the inner tank is heated, the pressure P2 on the inner tank gradually increases. When the pressure of the liner acts on the side of the combined valve core near the inner tank, the force generated is greater than the sum of the force produced by the water supply pressure on the other side and the pressure of the pagoda spring, the combined valve core will flow toward the water. One side (downward) moves, so that the water in the inner tank will flow back into the water supply pipe, and the pressure of the inner tank will drop thereupon until it is balanced. When the water supply system breaks down, a negative pressure will be generated in the water supply pipe, resulting in a siphon phenomenon, the combination valve core is opened, and hot water is sucked from the inner tank to the water supply pipe. If the user's water supply pipe is a PV pipe or an aluminum-plastic pipe that is not resistant to high temperatures, it may be deformed by heat, resulting in water leakage.

Contents of the invention

The purpose of this utility model is to provide an anti-siphon device for a water heater safety valve, which can prevent the water in the inner tank from flowing back into the water supply pipe when the water supply system fails, and prevent water leakage from occurring.

The utility model is achieved in the following way: an anti-siphon device for a water heater safety valve, comprising the bottom of the combined valve core in the safety valve and the steps of the safety valve body surrounding the bottom of the combined valve core, the bottom of the combined valve core and the step of the safety valve body are on the same surface Contact or line contact and cooperate with each other, the bottom of the combined spool covers or enters the step of the safety valve body.

In the above-mentioned anti-siphon device for water heater safety valve, the bottom of the combined valve core is convex, and the step of the safety valve body is concave or flat; or the bottom of the combined valve core is concave or flat, and the step of the safety valve body is convex.

In the above-mentioned anti-siphon device for water heater safety valve, the bottom of the combined valve body and the steps of the safety valve body are provided with overflow grooves or convex grooves; or the bottom of the combined valve body or the steps of the safety valve body are provided with overflow grooves or convex groove.

In the above-mentioned anti-siphon device for the safety valve of the water heater, a seal is installed at the contact between the bottom of the combined valve core and the step of the safety valve body.

The working principle of the utility model is to prevent water from flowing to the water supply pipe under the siphon state through the surface contact or line contact between the bottom of the combined valve core and the step of the safety valve body, and to enumerate the mutual cooperation of various shapes; The cooperation between the water return holes formed by the steps of the safety valve body prevents the water in the inner tank from returning to the water supply pipe when the siphon occurs, and plays the role of a throttle valve and a one-way valve. A seal is installed at the contact point between the bottom of the combined spool and the step of the safety valve body to prevent water from flowing to the water supply pipe in a siphon state, thereby forming a one-way valve. When the siphon phenomenon occurs, the combined valve core will move downward under the action of negative pressure, and when the seal is pressed, the water flow will be blocked, and when there is no seal, the water will be throttled. An overflow groove or convex groove is arranged on the bottom of the combined spool and/or on the step of the safety valve body, which also achieves the function of a throttle valve. When the siphon phenomenon occurs, through the contact and cooperation between the bottom of the combination valve core and the step of the safety valve body, the hot water in the inner tank of the water heater is prevented from flowing to the water supply pipe, so as to prevent the occurrence of water leakage.

Description of drawings

Fig. 1 is a structural schematic diagram of an anti-siphon device for a water heater safety valve of the present invention; Fig. 2 is a structural schematic diagram of an anti-siphon device for a water heater safety valve with a seal on the step of the safety valve body; Fig. 3 is a structure diagram of a combined valve core with a seal at the bottom Schematic diagram of the structure of the anti-siphon device for the safety valve of the water heater. Figure 4 is a schematic diagram of the structure of the anti-siphon device for the safety valve of the water heater with a one-way valve in the safety valve body. Figures 5 to 12 are schematic diagrams of various forms of surface contact structures. Figure 22 is a schematic diagram of various forms of line contact structures, Figure 23 is a schematic structural diagram of the overflow groove on the bottom of the combined valve core and the step of the safety valve body, Figure 24 is a top view of Figure 23, and Figure 25 is the bottom of the combined valve core and a structural schematic diagram of an overflow convex groove on the step of the safety valve body, Fig. 26 is a top view of Fig. 25 .

In the figure: 1 safety valve body step, 2 combined valve core bottom, 3 one-way valve piece, 4 pagoda spring, 5 spring, 6 pressure reed piece, 7 composite sealing piece, 8 sealing piece, 9 one-way valve sealing piece, 10 One-way valve body, 11 differential pressure valve sealing sheets.

Detailed ways

Referring to Fig. 1, an anti-siphon device for a safety valve of a water heater includes a combined valve core bottom 2 in the safety valve and a safety valve body step 1 surrounding the combined valve core bottom 2, the combined valve core bottom 2 and the safety valve body step 1 are Surface contact or line contact and cooperate with each other, the bottom 2 of the combined valve core covers or enters the step 1 of the safety valve body. Combination spools include differential pressure spools, check spools or throttle spools. The combined spool bottom 2 is in surface contact with the safety valve body step 1, see Figures 5 to 12; the combined spool bottom 2 is in line contact with the safety valve body step 1, see Figures 13 to 22. Figures 5 to 22 list various forms of contact fit, which can be divided into the cooperation between the bottom 2 of the combined valve core being convex and the step 1 of the safety valve body being concave or flat, and the bottom 2 of the combined valve core being concave or flat. The cooperation between the planar shape and the convex shape of the step 1 of the safety valve body. Fig. 23 to Fig. 26 show the structural diagrams of the combined valve core bottom 2 and the safety valve body step 1 surrounding the combined valve core bottom 2 with overflow grooves or convex grooves, which function as throttle valves. When the siphon phenomenon occurs, the combination spool moves downward under the action of negative pressure. When the bottom 2 of the combination spool contacts the upper surface of the step 1 of the safety valve body, most of the water flow will be blocked. Its function is similar to that of a throttle. flow valve. Simultaneously because the whole water supply system must be the same as the atmosphere at a certain point, so in a limited time, the negative pressure of the water inlet pipe will disappear, and the condition of the siphon will be destroyed.

Referring to Fig. 2 and Fig. 3, a seal 8 is installed at the contact point between the bottom 2 of the combined valve core of the anti-siphon device for the water heater safety valve and the step 1 of the safety valve body surrounding the bottom 2 of the combined valve core, which can be sealed at the bottom 2 of the combined valve core Part 8 can also be installed on the step 1 of the safety valve body. For the contact fit between the bottom 2 of the combined valve core and the step 1 of the safety valve body, Fig. 5 to Fig. 22 are also suitable for the anti-siphon device for the water heater safety valve with the seal 8. When the siphon phenomenon occurs, the bottom 2 of the combined valve core moves downward under the effect of negative pressure, and when the sealing member 8 is pressed, the water flow is blocked, and its function is consistent with that of a one-way valve.

See Figure 4, the bottom of the combined valve core of the anti-siphon device for water heater safety valve and the step of the safety valve body surrounding the bottom of the combined valve core. In the safety valve body, the one-way valve sealing sheet 9 and the sealing sheet support, the sealing sheet support constitutes a water return hole to cooperate with the bottom 2 of the combined valve core. Figures 5 to 22 and Figures 23 to 26 are also suitable for the anti-siphon device for the water heater safety valve shown in Figure 4 . When the siphon phenomenon occurs, the bottom 2 of the combined valve core moves downward under the action of negative pressure, and when it presses the step 1 of the safety valve body, the water flow is blocked (installed with a seal) to form a one-way valve; when no seal is installed When there are overflow grooves or convex grooves on the bottom 2 of the combination valve body or the step 1 of the safety valve body, when the bottom 2 of the combination valve core presses the step 1 of the safety valve body, the water will be throttled to form a section flow valve.

Claims (8)

1. water heater safety's valve anti-siphon means, it is characterized in that this anti-siphon means comprises the combination valve core bottom (2) and the Safety valve body step (1) that surrounds combination valve core bottom (2) in the safety valve, combination valve core bottom (2) contacts for face with Safety valve body step (1) or line contacts and cooperatively interact, and (2) cover or enter Safety valve body step (1) bottom the combination valve core.

2. water heater safety's valve anti-siphon means according to claim 1 is characterized in that combination valve core bottom (2) is convex, and Safety valve body step (1) is a concavity or plane.

3. water heater safety's valve anti-siphon means according to claim 1 is characterized in that combination valve core bottom (2) is concavity or plane, and Safety valve body step (1) is a convex.

4. according to claim 1 or 2 or 3 described water heater safety's valve anti-siphon means, it is characterized in that having overflow groove or tongue on combinaing valve body bottom (2) and the Safety valve body step (1).

5. according to claim 1 or 2 or 3 described water heater safety's valve anti-siphon means, it is characterized in that having overflow groove or tongue on combinaing valve body bottom (2) or the Safety valve body step (1).

6. according to claim 1 or 2 or 3 described water heater safety's valve anti-siphon means, it is characterized in that combination valve core bottom (2) and Safety valve body step (1) contacting point be equipped with Sealing (8).

7. water heater safety's valve anti-siphon means according to claim 4 is characterized in that combination valve core bottom (2) and Safety valve body step (1) contacting point be equipped with Sealing (8).

8. water heater safety's valve anti-siphon means according to claim 5 is characterized in that combination valve core bottom (2) and Safety valve body step (1) contacting point be equipped with Sealing (8).

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