JP2001029714A - Filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of such a malfunction of a filter that degradation of a filtering function is cause by breaking of a filter medium cartridge in the case when the pressure in a water supply piping is decreased, an internal pressure of the filter medium cartridge is yet maintained, and a negative pressure larger than an external pressure of the filter cartridge is generated, and a fitted part is forced to dislocate by force fitting or the like of the upper and lower cases of the external enclosure of the filter medium cartridge. SOLUTION: A filter medium cartridge 7 is stored in a filter main body having an inflow port 1a and an outflow port 1b, a bypass 16 is provided for connecting a primary side path of the main body in communication to an port 8a of the filter medium cartridge 7 with a secondary side path of the main body in communication to the outflow port 1b of the filter main body, and a valve 14 for uniformizing pressures in the inside and outside of the filter medium cartridge 7 is provided to the bypass 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter having a cartridge containing a filter medium for filtering impurities in tap water.

[0002]

2. Description of the Related Art In recent years, with the deterioration of tap water quality, consumers are increasingly interested in drinking water, and filters for purifying tap water have become widespread. In addition, as a market need, there is a demand for a filter having a low-priced and dividable filter medium cartridge for the purpose of recycling for environmental protection.

The structure of a conventional filter will be described with reference to FIG. 3. An inlet 1a for tap water and an outlet 1b for filtered water.
The filter main body is formed by fitting a cap-shaped main body cover 1 having a cylindrical shape and a bottomed cylindrical main body case 2, and a replaceable filter medium cartridge 7 containing a plurality of filter mediums 6 is housed in an inner space thereof. Have been.

[0004] The filter medium cartridge 7 is formed by fitting a cap-shaped upper case 8 having a hole for guiding a water collecting pipe in the center and a bottomed cylindrical lower case 9 by press-fitting or the like to form an outer shell.
A plurality of filter media 6 for filtering impurities such as residual chlorine and turbidity contained in tap water are contained in the internal space, and a side portion of a hole for leading out a water collecting pipe at the upper part of the upper case 8. Is provided with an inflow hole 8a of tap water, a water guide pipe 10 extending downward inside the filter medium cartridge 7 communicates with the inflow hole 8a, and a filter medium 6 is retained in a fitting portion between the water guide pipe 10 and the inflow hole 8a. A check valve 11 and a mount 12 are provided for preventing water, impurities, and the like from flowing out of the filter medium cartridge 7 due to backflow. The water filtered by the plurality of filter media 6 is supplied to an outlet of the filter body. A water collecting pipe 13 for leading to 1b is arranged and connected to the filter body. In the figure, 3 is a packing provided at a fitting portion between the main body cover 1 and the main body case 2, 4 is an auxiliary screw provided at an inlet 1a of tap water and an outlet 1b of filtered water, and 5 is an engagement of the auxiliary screw 4. An O-ring provided at the joint.

[0005] Here, the flow of water will be briefly described. Tap water flows into the filter body through an inlet 1a, passes through a plurality of filter media 6 built in a filter media cartridge 7, and the filtered water is filtered. It is guided and discharged to the outlet 1b of the vessel body.

[0006]

By the way, in a filter used as an in-line type which is directly connected to a water pipe, since the pressure in the water pipe fluctuates depending on the tap water usage of an adjacent private house, the filter is not used. In the state, when the filter medium cartridge 7 has a check valve, or when the filter medium 6 or the filter traps impurities and causes clogging, the internal pressure of the filter medium cartridge 7 is reduced even if the pressure in the water supply pipe is reduced. Is held, and a negative pressure that is larger than the external pressure of the filter medium cartridge 7 is generated. Therefore, the fitted portions are disengaged by press-fitting the upper and lower cases 1 and 2 forming the outer periphery of the filter medium cartridge 7, and the filter medium cartridge and the like are removed. There was a problem of causing breakage and lowering of the filtration function.

Therefore, it is necessary to improve the mechanical strength and the fitting method of the upper and lower cases 1 and 2 forming the outer shell of the filter medium cartridge and the like. However, the cost is high and the environmental protection for the future is required. It is considered that the ease of dividing and disassembling the filter medium cartridge 7 for the purpose of recycling is reduced.

The present invention solves the above-mentioned conventional problems and provides a filter that prevents breakage of a filter medium cartridge and does not impair the filtration function even if the internal pressure of the filter medium cartridge becomes higher than the external pressure. The purpose is to do.

[0009]

In order to achieve the above object, the present invention relates to a main body having a filter medium cartridge housed in a main body having an inlet for tap water and an outlet for filtered water and communicating with the inlet of the filter medium cartridge. A filter having a bypass passage connecting the primary passage of the filter medium and the secondary passage of the main body communicating with the outlet of the filter cartridge, and a valve provided in the bypass passage for equalizing the pressure inside and outside the filter cartridge. Container.

According to the present invention, in a filter used as an in-line type directly connected to a water supply pipe, the filter is not affected by pressure fluctuations in the water supply pipe due to the usage of tap water in a private house adjacent to the water supply pipe. When the filter is not in use, the internal pressure of the filter medium cartridge and the external pressure can be equalized, preventing damage to the filter medium cartridge and providing a filter that does not impair the filtration function. it can.

[0011]

DETAILED DESCRIPTION OF THE INVENTION According to the first aspect of the present invention, a filter medium cartridge is housed in a filter body having an inlet and an outlet, and a primary side passage communicating with the inlet of the filter medium cartridge is provided. A filter provided with a bypass which connects a secondary side passage communicating with the outlet of the filter body, and provided with a valve in the bypass, without being affected by pressure fluctuations in the water supply pipe, When the filter is not used, the internal pressure of the filter media cartridge and the external pressure can be equalized,
This has the effect of preventing the filter medium cartridge from being damaged.

According to a second aspect of the present invention, there is provided the filter according to the first aspect, wherein the filter medium cartridge has a check valve at an inflow port. Filter media and impurities are backflowed,
This has the effect of preventing outflow from the inside of the filter medium cartridge to the outside.

According to a third aspect of the present invention, in the filter according to the first aspect, a valve in a bypass between the primary side passage and the secondary side passage is provided with a hydraulic pressure in the secondary side passage. It is designed to open when the pressure is higher than the water pressure in the primary side passage, and is not affected by the pressure fluctuation in the water supply pipe, and when the filter is not in use, the internal pressure and the external pressure of the filter medium cartridge are reduced. This has the effect of equalizing the pressure and preventing breakage of the filter medium cartridge.

According to a fourth aspect of the present invention, in the filter according to the first or third aspect, the valve is fitted into a cylindrical cap, and the cylindrical cap is joined to a bypass passage. It is possible to equalize the internal pressure and the external pressure of the filter cartridge when the filter is not in use, without being affected by pressure fluctuations in the water pipe, and to prevent damage to the filter cartridge. It has the action of:

According to a fifth aspect of the present invention, in the filter according to any one of the first to third aspects, the bypass path has an annular rib on a sealing surface of the valve mounting portion. Yes, the sealability to prevent water from flowing from the primary passage to the secondary passage of the main body is improved, and the pressure of the internal pressure and the external pressure of the filter cartridge is not affected by the pressure fluctuation in the water supply pipe. Has an effect that the filter medium cartridge can be prevented from being damaged.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

(Embodiment 1) FIG. 1 is a sectional view of a filter according to Embodiment 1 of the present invention. In FIG. 1, members corresponding to those of the filter described in the related art are denoted by the same reference numerals.

Next, the structure of the filter according to the first embodiment will be described with reference to FIG.
Is formed by fitting a cap-shaped main body cover 1 having a tap water inlet 1a and a filtered water outlet 1b with a bottomed cylindrical main body case 2. A fitting portion between the main body cover 1 and the main body case 2 is sealed by a packing 3, and an auxiliary screw 4 is fixed to the inflow port 1a and the outflow port 1b of the main body cover 1 by screw fitting as a member for connecting to a water supply pipe. In order to stabilize the sealing property, O
The ring 5 is connected as a double seal provided at two places.

Inside the main body case 2, a filter medium cartridge 7 is exchangeably accommodated. The filter medium cartridge 7 includes a cap-shaped upper case 8 and a bottomed cylindrical lower case 9 fitted to each other by press-fitting or the like to form a space inside the case, such as residual chlorine and turbidity contained in tap water. A plurality of filter media 6 are built in to filter impurities. In addition, a water collecting pipe outlet hole is provided in the center of the upper part of the upper case 8, and a tap water inlet 8 a is provided on a side portion of the water collecting pipe outlet hole, so that a water guide extending downward inside the filter medium cartridge 7 is provided. The pipe 10 communicates with the inlet 8a,
The fitting portion between the water guide pipe 10 and the inflow port 8a is provided with a check valve 11 and a mounting base 12 for preventing the filter medium 6, stagnant water, impurities and the like from flowing out of the filter medium cartridge 7 by the backflow. ing. Further, a water collecting pipe 13 of water filtered by a plurality of filter media 6 is provided.
The third outlet 13a is fitted to and connected to a water collecting pipe connection hole at the center of the main body cover 1 through a water collecting pipe leading hole at the upper part of the upper case 8. An O-ring 17 is provided in a hole for connecting the water collecting pipe into which the outlet 13a of the water collecting pipe 13 is fitted.

A bypass passage 16 is formed at the center of the main body cover 1 at the side of the hole for connecting the water collecting pipe to the outlet 1b. The bypass passage 16 is provided with a cap 15 and a valve 14 for equalizing the pressure inside and outside the filter medium cartridge 7.

Here, the flow of water will be briefly described. Tap water flows into the filter main body through the inlet 1a of the main body cover 1, flows through the inlet 8a of the filter medium cartridge 7, and is guided through the water pipe 10. Then, the water that has passed through the plurality of built-in filter media 6 and is filtered is collected in the water collecting pipe 13, and guided from the outlet 13 a at the tip of the water collecting pipe to the outlet 1 b through the hole for connecting the water collecting pipe of the main body cover 1. Released outside the device.
When represented by the symbols shown in FIG. 1, A → B → C → D → E → F → G
→ H.

Next, a valve configuration for equalizing the pressure inside and outside the filter medium cartridge 7, which is a main part of the present invention, will be described.

FIG. 2A is a sectional view showing a closed state of the valve of the filter according to the first embodiment of the present invention, FIG. 2B is a bottom view showing the closed state of the valve, and FIG. c) is a cross-sectional view showing the valve in an open state, FIG. 2D is a bottom view showing the valve in an open state, and FIG. 2E is a valve seal part of a main body cover of the filter. It is a bottom view.

The valve configuration in the filter will be described with reference to FIGS. 1 and 2 (a).

A space connecting the inlet 8a of the filter medium cartridge 7 housed in the filter body and the inlet 1a of the filter body, that is, the primary side passage V1, the outlet 13a of the filter medium cartridge 7, and the flow of the filter body. The space communicating with the outlet 1b, that is, the secondary side passage V2 is connected by a bypass passage 16 provided in the main body cover 1, and the valve 14 is fitted in a cylindrical cap 15, and the bypass passage 1 of the main body cover 1 is connected.
6.

Next, FIGS. 2 (a), (b), (c),
The valve operation will be described with reference to FIG.

2A and 2B, when the filter is in use, the water pressure P1 in the primary passage V1 is larger than the water pressure P2 in the secondary passage V2, that is, the filter medium cartridge 7 When the external water pressure is higher than the internal water pressure, the adjusting port 14a of the valve 14 is in a closed state, and therefore does not pass through the filter medium cartridge 7. That is, it is possible to prevent the unfiltered water from flowing out of the primary side passage V1 to the secondary side passage V2.

2 (c) and 2 (d), when the filter is not used, the water pressure in the water supply pipe is affected by the pressure fluctuation due to the use condition of the adjacent private house, so that the primary passage V1 is not used.
In some cases, a state in which the water pressure P2 in the secondary passage V2 is higher than the internal water pressure P1, that is, a state in which the water pressure inside the filter medium cartridge 7 is higher than the outside water pressure may occur. At that time, since the water pressure P2 in the secondary passage V2 is released into the primary passage V1, the adjustment port 14a of the valve 14 is opened, so that the water pressure P1 in the primary passage V1 and the water pressure P2 in the secondary passage V2 are not changed. Of the filter medium cartridge 7 due to the disengagement of the fitting portion between the upper case 8 and the lower case 9 forming the outer shell of the filter medium cartridge 7, thereby providing filtered water without impairing the filtration function. can do.

In FIG. 2 (e), an annular rib 1c is provided on the sealing surface of the mounting portion of the valve 14 of the bypass passage 16 provided in the main body cover 1, so that the primary side passage V1 of the filter main body can be removed. The sealing performance for preventing the unfiltered water from flowing out to the secondary side passage V2 can be improved.

As described above, the filter according to the first embodiment includes the inlet 8a of the filter medium cartridge 7 housed in the filter body.
The space that communicates with the inlet 1a of the filter body, that is, the primary side passage V1, and the space that communicates the outlet 13a of the filter medium cartridge 7 with the outlet 1b of the filter body, that is, the secondary side passage V2, 1 is a filter used as an in-line type which is directly connected to a water pipe because it is connected with a bypass path 16 provided in 1 and a valve 14 is provided in the bypass path 16. When the water pressure fluctuates depending on the situation and the filter is not used, even if the internal pressure of the filter medium cartridge 7 becomes higher than the external pressure, the filter medium cartridge 7 is prevented from being damaged, and the filtration function is not impaired.

[0031]

As is apparent from the above description, the present invention relates to a filter used as an in-line type which is directly connected to a water supply pipe. When the filter medium fluctuates and the filter is not used, even if the internal pressure of the filter medium cartridge becomes higher than the external pressure, it is possible to provide a filter that prevents damage to the filter medium cartridge and does not impair the filtration function.

[Brief description of the drawings]

FIG. 1 is a sectional view of a filter according to a first embodiment of the present invention.

2A is a cross-sectional view showing a closed state of a valve of the filter. FIG. 2B is a bottom view showing a closed state of the valve. FIG. 2C is a cross-sectional view showing an open state of the valve. Bottom view showing the state (e) Bottom view showing the valve seal part of the body cover of the filter

FIG. 3 is a cross-sectional view of a conventional filter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body cover 1a Inflow port 1b Outflow port 1c Annular rib 2 Main case 3 Packing 4 Auxiliary screw 5 O-ring 6 Filter medium 7 Filter medium cartridge 8 Upper case 8a Inflow port 9 Lower case 10 Water guide pipe 11 Check valve 12 Mounting base 13 Water collecting pipe 13a Outflow port 14 Valve 14a Adjustment port 15 Cap 16 Bypass path 17 O-ring

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yasuyuki Ikata 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. 72) Inventor Kazuya Yamamoto 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F term (reference) 4D064 AA01 BA21 BA36 DE04

Claims (5)

[Claims] 1. A filter medium cartridge is accommodated in a filter body having an inlet and an outlet, and a primary side passage communicating with the inlet of the filter medium cartridge and a secondary side passage communicating with the outlet of the filter body. And a bypass path for connecting the filter and the filter, and a valve is provided in the bypass path. 2. The filter according to claim 1, wherein the filter medium cartridge has a check valve at an inflow port. 3. The valve of a bypass passage between a primary passage and a secondary passage is opened when a water pressure in the secondary passage is higher than a water pressure in the primary passage. The filter according to claim 1, wherein 4. The filter according to claim 1, wherein the valve is fitted into a cylindrical cap, and the cylindrical cap is joined to a bypass passage. 5. The filter according to claim 1, wherein the bypass has an annular rib on a sealing surface of the valve mounting portion.