Negative pressure valve

Abstract

The utility model provides a negative pressure valve which comprises a valve cover, a valve body and a valve seat, the valve body is provided with a water inlet, a water outlet and a valve port used for communicating the water inlet and the water outlet, the negative pressure valve further comprises a sealing piece, the sealing piece is provided with an integrally-formed sealing ring, a plurality of inverted-V-shaped elastic arms and a plugging part, and the sealing ring is used for sealing a gap between the valve cover and the valve body; the plugging part is arranged in the middle of the sealing ring and connected with the sealing ring through a plurality of inverted-V-shaped elastic arms arranged along the outer edge of the plugging part at intervals, and the inverted-V-shaped elastic arms apply elastic acting force used for plugging the valve port to the plugging part. Compared with the prior art, only one sealing piece needs to be arranged, the structure is simpler, and assembly is faster and more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, and particularly relates to a negative pressure valve. Background Art

[0002] The existing negative pressure valve includes a valve cover, a valve body and a valve seat. The valve body is provided with a water inlet and a water outlet. A valve port for communicating the water inlet and the water outlet is arranged inside the valve body. A valve plug is arranged above the valve port of the valve body, and a spring for pressing the valve plug to block the valve port is provided. A push rod is arranged below the valve port. A sealing ring is further arranged between the edge of the valve cover and the valve body. In this way, the number of parts is large, the assembly is rather cumbersome, and the production cost is increased. Content of the Utility Model

[0003] Therefore, the technical problem to be solved by the utility model is to overcome the defects of the existing negative pressure valve, such as the large number of parts and high production cost, so as to provide a negative pressure valve with a simple structure.

[0004] For this purpose, the utility model provides a negative pressure valve, which includes a valve cover, a valve body and a valve seat. The valve body has a water inlet, a water outlet, and a valve port for communicating the water inlet and the water outlet. The negative pressure valve further includes: a sealing member, which has an integrally formed sealing ring, a plurality of inverted V-shaped elastic arms and a plugging portion. The sealing ring is used to seal the gap between the valve cover and the valve body. The plugging portion is arranged in the middle of the sealing ring and is connected to the sealing ring through a plurality of the inverted V-shaped elastic arms arranged at intervals along its outer edge. The plurality of inverted V-shaped elastic arms apply an elastic force for plugging the valve port to the plugging portion.

[0005] The valve body has a chamber located below the valve port. A push rod assembly is arranged in the chamber. The push rod assembly includes a push rod corresponding to and abutted against the plugging portion, and a spring for driving the push rod to reset. The push rod divides the chamber into an upper chamber and a lower chamber, and the lower chamber communicates with the outside.

[0006] The push rod includes a push rod portion arranged on the upper part and a sliding rod portion arranged on the lower part. An annular groove is formed on the periphery of the sliding rod portion, and at least one sealing ring abutted against the inner wall of the chamber is arranged in the annular groove.

[0007] The valve seat is arranged below the valve body and is assembled with the valve body through screws. An air hole for communicating the outside with the lower chamber is arranged in the middle of the valve seat.

[0008] A first step is arranged at the top edge of the valve body, and the sealing ring has a second step corresponding to and abutted against the first step.

[0009] The technical solution of the utility model has the following advantages:

[0010] 1. The negative pressure valve provided by the present utility model has a sealing member with an integrally formed sealing ring, a plurality of inverted V-shaped elastic arms, and a plugging portion. The sealing ring is used to seal the gap between the valve cover and the valve body. The plugging portion is provided in the middle of the sealing ring and is connected to the sealing ring through a plurality of inverted V-shaped elastic arms arranged at intervals along its outer edge. The plurality of inverted V-shaped elastic arms apply an elastic force for plugging the valve port to the plugging portion. That is, the sealing member not only seals the valve cover and the valve body but also plugs the valve port. Compared with the prior art, only one sealing member needs to be provided in this way, the structure is simpler, and the assembly is more rapid and convenient.

[0011] 2. The negative pressure valve provided by the present utility model has a chamber located below the valve port in the valve body. The chamber is provided with a push rod assembly. The push rod assembly includes a push rod corresponding to and abutting against the plugging portion and a spring for driving the push rod to reset. The push rod divides the chamber into an upper chamber and a lower chamber. The lower chamber communicates with the outside. When a negative pressure is formed at the water inlet, the push rod moves upward under the action of atmospheric pressure against the force of the spring, thereby pushing open the plugging portion and enabling the water inlet, the valve port, and the water outlet to communicate.

[0012] 3. The negative pressure valve provided by the present utility model has a first step provided at the top edge of the valve body. The sealing ring has a second step corresponding to and abutting against the first step. The setting of the above steps makes the sealing effect between the valve cover and the valve body better. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0014] Figure 1 It is a sectional view of the negative pressure valve of the present utility model;

[0015] Figure 2 It is an exploded structural schematic diagram of the negative pressure valve.

[0016] Explanation of reference numerals: 1, valve cover; 2, valve body; 3, valve seat; 4, water inlet; 5, water outlet; 6, valve port; 7, sealing member; 8, sealing ring; 9, inverted V-shaped elastic arm; 10, plugging portion; 11, push rod; 12, spring; 13, upper chamber; 14, lower chamber; 15, push rod portion; 16, sliding rod portion; 17, annular groove; 18, sealing ring; 19, air hole; 21, first step; 22, second step. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative work shall fall within the protection scope of the present utility model.

[0018] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0019] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0020] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0021] Embodiment

[0022] This embodiment provides a negative pressure valve, as Figure 1 shown, including a valve cover 1, a valve body 2, a valve seat 3, a seal 7, and a push rod assembly.

[0023] The valve body 2, as Figure 1 and Figure 2 shown, has a water inlet 4, a water outlet 5, and a valve port 6 for communicating the water inlet 4 and the water outlet 5. The valve body 2 has a chamber located below the valve port 6.

[0024] The seal 7, as Figure 1 and Figure 2As shown, it has an integrally formed sealing ring 8, a plurality of inverted V-shaped elastic arms 9 and a plugging portion 10. The sealing ring 8 is used to seal the gap between the valve cover 1 and the valve body 2. The plugging portion is arranged in the middle of the sealing ring 8 and is connected to the sealing ring 8 through a plurality of the inverted V-shaped elastic arms 9 arranged at intervals along its outer edge. The plurality of inverted V-shaped elastic arms 9 apply an elastic force for plugging the valve port 6 to the plugging portion 10. A first step 21 is provided at the top edge of the valve body 2, and the sealing ring 8 has a second step 22 corresponding to and abutting against the first step 21.

[0025] A push rod assembly is arranged in the chamber below the valve port 6. The push rod assembly includes a push rod 11 corresponding to and abutting against the plugging portion 10, and a spring 12 for driving the push rod 11 to reset, as Figure 1 shown. The push rod 11 divides the chamber into an upper chamber 13 and a lower chamber 14, and the lower chamber 14 communicates with the outside. The push rod 11 includes a push rod portion 15 arranged on the upper part and a sliding rod portion 16 arranged on the lower part. An annular groove 17 is formed on the periphery of the sliding rod portion 16, and two sealing rings 18 abutting against the inner wall of the chamber are arranged in the annular groove 17.

[0026] A valve seat 3 is arranged below the valve body 2 and is assembled with the valve body 2 by screws. An air hole 19 communicating the outside with the lower chamber 14 is provided in the middle of the valve seat 3.

[0027] For the negative pressure valve provided by the present utility model, the seal 7 has an integrally formed sealing ring 8, a plurality of inverted V-shaped elastic arms 9 and a plugging portion 10. The sealing ring 8 is used to seal the gap between the valve cover 1 and the valve body 2. The plugging portion 10 is arranged in the middle of the sealing ring 8 and is connected to the sealing ring 8 through a plurality of the inverted V-shaped elastic arms 9 arranged at intervals along its outer edge. The plurality of inverted V-shaped elastic arms 9 apply an elastic force for plugging the valve port 6 to the plugging portion 10, that is, the seal 7 not only plays the role of sealing the valve cover 1 and the valve body 2, but also plays the role of plugging the valve port 6. Compared with the prior art, only one seal needs to be provided in this way, the structure is simpler, and the assembly is more rapid and convenient.

[0028] Obviously, the above embodiments are only examples clearly described and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made on the basis of the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the creative concept of the present utility model.

Claims

1. A negative pressure valve, comprising a valve cover (1), a valve body (2) and a valve seat (3), wherein the valve body (2) has a water inlet (4), a water outlet (5), and a valve port (6) for connecting the water inlet (4) and the water outlet (5), characterized in that: Also includes: The sealing member (7) comprises an integrally formed sealing ring (8), a plurality of inverted V-shaped elastic arms (9) and a sealing portion (10); the sealing ring (8) is used to seal the gap between the valve cover (1) and the valve body (2); the sealing portion is arranged in the middle of the sealing ring (8) and is connected to the sealing ring (8) via a plurality of inverted V-shaped elastic arms (9) arranged at intervals along the outer edge thereof; the plurality of inverted V-shaped elastic arms (9) apply an elastic force toward the sealing portion (10) for sealing the valve port (6).

2. The negative pressure valve according to claim 1, characterized in that: The valve body (2) has a chamber located below the valve port (6), and the chamber is provided with a push rod assembly, the push rod assembly includes a push rod (11) corresponding to the blocking portion (10) and a spring (12) for driving the push rod (11) to return to its original position, the push rod (11) divides the chamber into an upper chamber (13) and a lower chamber (14), and the lower chamber (14) is connected to the outside.

3. The negative pressure valve according to claim 2, characterized in that: The push rod (11) comprises a push rod portion (15) arranged on the top, and a sliding rod portion (16) arranged on the bottom, an annular groove (17) is formed on the periphery of the sliding rod portion (16), and at least one sealing ring (18) is arranged in the annular groove (17) to abut against the inner wall of the chamber.

4. The negative pressure valve according to claim 2 or 3, characterized in that: The valve seat (3) is arranged below the valve body (2) and is assembled with the valve body (2) by means of screws. An air hole (19) is arranged in the middle of the valve seat (3) for connecting the outside with the lower chamber (14).

5. The negative pressure valve according to claim 1, characterized in that: The top edge of the valve body (2) is provided with a first step (21), and the sealing ring (8) has a second step (22) corresponding to and abutting against the first step (21).

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