Pre-filter

Abstract

The utility model discloses a prefilter which comprises a body and a shell which can be connected with each other, a water inlet channel and a water outlet channel are arranged on the body, a filter element is arranged in the shell, a water passing port is further arranged in the body, the water inlet channel can flow into the shell and is communicated with the water inlet end of the filter element, and the water passing port is communicated with the water outlet end of the filter element. The water outlet end of the filter element can be communicated with the water outlet channel through the water opening, a water through hole is formed between the water outlet channel and the shell, and a one-way valve is arranged in the water through hole; when water flows through the body and the shell normally, the water pressure in the shell is larger than that in the water outlet channel, and the one-way valve can be controlled by the water pressure difference so that the water passing hole can be blocked. When water in the body and the shell is frozen, the water pressure in the water outlet channel expands to be larger than the water pressure in the shell due to freezing of the water, the one-way valve can be controlled by the pressure difference to enable the water through hole to be communicated, the pre-filter can well protect the body and the shell from being exploded, meanwhile, the pre-filter can be made of all-plastic materials, and cost is reduced.

Description

Technical Field

[0001] The utility model relates to a pre-filter which can be used on the structure of a voltage-stabilizing pre-filter. Background Art

[0002] The existing pressure-stabilizing pre-filter only meets the user's functional requirements for pressure regulation, but its usage conditions are relatively limited. For example, in the north where the temperature is low, the nighttime temperature is around -20℃ or even lower. When the user is not using water, the water inside the pressure-stabilizing pre-filter will freeze, squeezing the shell and causing product abnormalities or even failure. For example, if copper is used as the pressure regulating valve shell, the metal material makes the entire product cost higher, and the overall complex structure will also make it difficult to form. Summary of the Invention

[0003] In order to solve the above technical problems, the purpose of the present utility model is to provide a pre-filter.

[0004] The utility model is realized by the following technical solutions:

[0005] A pre-filter comprises a main body and a shell that can be connected, the main body being provided with a water inlet and a water outlet, the shell being provided with a filter element, and the main body being further provided with a water outlet, the water inlet being able to flow into the shell and being connected with the water inlet end of the filter element, the water outlet end of the filter element being able to be connected with the water outlet through the water outlet, a water through hole being provided between the water outlet and the shell, and a one-way valve being provided in the water through hole; when water is flowing through the main body and the shell normally, the water pressure in the shell is greater than the water pressure in the water outlet, and the one-way valve can be controlled by the water pressure difference so that the water through hole is blocked; when water in the main body and the shell is frozen, the water pressure in the water outlet is greater than the water pressure in the shell due to the expansion of the water when it freezes, and the one-way valve can be controlled by the pressure difference so that the water through hole is conducted.

[0006] In the embodiment of the present invention, a pressure regulating valve capable of cooperating with the water outlet is provided in the main body.

[0007] In the embodiment of the present invention, the contact area between the pressure regulating valve and the rear end water channel is larger than the contact area between the pressure regulating valve and the front end water channel.

[0008] In an embodiment of the present invention, the upper opening of the shell is screwed to the lower opening of the body, the filter element is arranged in the middle part of the shell, and a water inlet cavity is formed between the inner periphery of the shell and the outer periphery of the filter element. The water flow of the water inlet can pass into the water inlet cavity and then be filtered through the filter element.

[0009] In the embodiment of the present invention, a water outlet cavity is formed between the shell at the water outlet end of the filter element and the main body, and a water hole that can connect the water outlet channel and the water outlet cavity is provided on the main body.

[0010] In the embodiment of the present invention, the body is made of plastic material.

[0011] In an embodiment of the present invention, the shell is made of nylon.

[0012] The utility model provides a pre-filter with the following beneficial effects: the pressure-stabilizing pre-filter can be made of plastic both before and after the valve, which reduces costs; and at the same time, a one-way valve is added to ensure that the pressure after the valve can be transferred to the front end under low temperature conditions, thereby preventing the water channel after the valve from freezing and cracking. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0014] Figure 1 It is a schematic diagram of the present utility model.

[0015] Figure 2 yes Figure 1 Enlarged schematic diagram of point A in the middle. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0017] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 understood as a limitation on the present invention.

[0018] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0019] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0020] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0021] Referring to the drawings of the specification, a pre-filter includes a main body 10 and a shell 20 that can be connected. In a preferred embodiment, the main body and the shell are both made of plastic material, and metal is not suitable, which reduces the cost of production. A water inlet 11 and a water outlet 12 are provided on the main body, and a filter element 30 is provided in the shell. A water outlet 13 is also provided in the main body. The water inlet can flow into the shell and is connected with the water inlet end of the filter element. The water outlet end of the filter element can be connected with the water outlet through the water outlet, thus forming a complete water flow direction. Municipal water flows in from the water inlet and flows out from the water outlet after filtration. A water hole 14 is provided between the water outlet and the shell, and a one-way valve 40 is provided in the water hole. The one-way valve can only allow water in the outlet to flow out. Flows to the shell; when water flows normally through the body and the shell, the water pressure in the shell is greater than the water pressure in the water outlet, and the one-way valve can be controlled by the water pressure difference to block the water hole. That is to say, at normal temperature (water is not frozen), when water can flow, the one-way valve is closed, so that there is no direct communication between the water outlet and the shell; when water in the body and the shell freezes, the water pressure in the water outlet is greater than the water pressure in the shell due to the expansion of water when it freezes, and the one-way valve can be controlled by the pressure difference to make the water hole open, that is, when the water in the water outlet gradually freezes, the water pressure of the unfrozen water rises. When this water pressure is greater than the water pressure in the shell, the one-way valve opens, and the water pressure in the water outlet is transferred to the shell and absorbed by the shell, to ensure that the water outlet structure and the structure inside the shell will not be frozen and cracked.

[0022] Furthermore, a pressure regulating valve 50 that can cooperate with the water outlet is provided in the body. The pressure regulating valve can adjust the water pressure of the water outlet (or even the water outlet end of the filter) by controlling the water flow into the water outlet.

[0023] Preferably, the contact area between the pressure regulating valve and its rear end water channel is larger than the contact area between the pressure regulating valve and its front end water channel. This ensures that during normal use, the water pressure inside the shell is greater than the water pressure in the water outlet, so that the one-way valve remains closed under the action of water pressure.

[0024] Referring to the accompanying drawings, the upper opening of the shell is screwed to the lower opening of the main body, and the main body and the shell can present a T shape after being connected. The filter element is arranged in the middle part of the shell and can be coaxially arranged. A water inlet cavity 21 is formed between the inner periphery of the shell and the outer periphery of the filter element. The water flow of the water inlet can pass into the water inlet cavity and then be filtered through the filter element.

[0025] Furthermore, a water outlet cavity 22 is formed between the shell and the main body at the water outlet end of the filter element, and a water hole 14 is provided on the main body to connect the water outlet channel and the water outlet cavity.

[0026] In the specific use of the present invention, the main body is made of plastic material and the shell is made of nylon.

[0027] To be more specific, the present utility model is as shown in the attached structure. The important water channels of the product are all made of plastic, and the front cavity of the valve (the front end of the pressure regulating valve, which can be the shell) adopts buffer material to prevent the expansion of water when freezing and causing the entire product shell to crack. Because the valve is in the closed state, the product water channel is divided into two parts, one is in front of the valve and the other is behind the valve, resulting in the expansion of the water in the rear part of the valve (water outlet) after freezing. Therefore, a one-way valve is added to open the water channels before and after the valve. The details are as follows: Municipal tap water enters the shell (front cavity of the valve), is filtered by the filter element, and enters the rear cavity of the valve (water outlet) through the pressure regulating valve. The outside of the front cavity of the valve is the shell, which is made of a material with excellent toughness. A one-way valve is added adjacent to the water channels of the front cavity of the valve and the rear cavity of the valve. When used at normal temperatures, due to the difference in area between the front and rear components of the valve, the water pressure in the rear chamber is lower than that in the front chamber. This pressure differential compresses the check valve, preventing water from flowing into the outlet chamber. This ensures the product's pressure-stabilizing function can properly regulate the rear water pressure. When the product is exposed to low temperatures (sub-zero), the water outside the filter element (outside the filter element) is closest to the housing and begins to freeze first. This ice expands, squeezing the water inside. Since the water inside cannot be compressed, it pushes outward against the housing, which is made of highly resilient material. The increased volume of the frozen water is absorbed by the housing, reducing the pressure. The rear chamber (i.e., the outlet) cannot absorb the increased volume of the frozen water, causing the water pressure to continue to rise. If not relieved, this could easily cause the valve body to crack. Therefore, when the pressure in the rear chamber exceeds the pressure in the front chamber, the check valve opens, allowing the water in the rear chamber to flow into the front chamber. Freezing occurs inside the housing, allowing the housing to absorb the expansion and thus preventing the rear chamber from freezing and cracking.

[0028] The utility model mainly adds a one-way valve structure, and utilizes the principle that there is a pressure difference before and after the pressure-stabilizing valve in the working state. At this time, the one-way valve is in a closed state, thereby ensuring the normal operation of the product's pressure-stabilizing function; pressure transfer when frozen: when the product is frozen, the water pressure before and after the valve increases, but the shell in front of the valve is made of a material with preferred toughness and can relieve pressure. The pressure after the valve cannot be relieved, resulting in a sharp increase in pressure. When the pressure after the valve is higher than the pressure before the valve, the one-way valve opens, allowing the water pressure after the valve to be discharged to the front of the valve and absorbed by the material with excellent toughness. Therefore, the product can be made of all-plastic material, which reduces costs.

[0029] The foregoing description shows and describes preferred embodiments of the present invention. As previously mentioned, it should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Instead, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the present invention as taught herein or through the techniques or knowledge of the relevant art. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be protected by the claims appended hereto.

Claims

1. A pre-filter comprising a body and a housing that can be connected, characterized in that: The body is provided with a water inlet and a water outlet, a filter element is provided in the shell, and a water outlet is further provided in the body. The water inlet can flow into the shell and is connected with the water inlet end of the filter element, and the water outlet end of the filter element can be connected with the water outlet through the water outlet. A water hole is provided between the water outlet and the shell, and a one-way valve is provided in the water hole. When water flows normally through the body and the shell, the water pressure in the shell is greater than the water pressure in the water outlet, and the one-way valve can be controlled by the water pressure difference to block the water hole; When water in the body and the shell freezes, the water pressure in the water outlet is greater than the water pressure in the shell due to the expansion of the water when it freezes, and the one-way valve can be controlled by the pressure difference to make the water hole open.

2. A pre-filter according to claim 1, characterized in that: The main body is provided with a pressure regulating valve which can be matched with the water outlet.

3. A pre-filter according to claim 2, characterized in that: The contact area between the pressure regulating valve and the water channel at the rear end thereof is larger than the contact area between the pressure regulating valve and the water channel at the front end thereof.

4. A pre-filter according to any one of claims 1 to 3, characterized in that: The upper opening of the shell is screwed to the lower opening of the body, the filter element is arranged in the middle of the shell, and a water inlet cavity is formed between the inner periphery of the shell and the outer periphery of the filter element. The water flow of the water inlet can pass through the water inlet cavity and then be filtered through the filter element.

5. A pre-filter according to claim 4, characterized in that: A water outlet cavity is formed between the shell body and the main body at the water outlet end of the filter element, and a water hole is provided on the main body to connect the water outlet channel and the water outlet cavity.

6. A pre-filter according to claim 5, characterized in that: The body is made of plastic material.

7. A pre-filter according to any one of claims 1-3, 5 and 6, characterized in that: The housing is made of nylon.

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