Pressure release valve capable of automatically adjusting action value according to water inlet pressure and pump room applying pressure release valve

Abstract

The utility model belongs to the technical field of water fire control, and particularly relates to a pressure release valve capable of automatically adjusting an action value according to water inlet pressure and a pump room applying the pressure release valve. The pressure release valve comprises a main valve body, a pilot valve body and a guide pipe combination. The interior of the main valve body is divided into a valve front cavity A, a valve rear cavity B and a diaphragm upper cavity C from bottom to top through a valve element and a diaphragm, and the valve element and the diaphragm are connected through a guide rod. The interior of the pilot valve body is divided into a pilot valve element lower cavity F, a pilot valve diaphragm lower cavity E and a pilot valve body diaphragm upper cavity D through a pilot valve element and a pilot valve diaphragm from bottom to top, and the pilot valve element and the pilot valve diaphragm are connected with a screw through a spring. The guide pipe combination comprises a plurality of guide pipes connected between the main valve body and the pilot valve body. In a municipal direct water supply fire-fighting system, the action accuracy value of the pressure release valve can be effectively improved, safe and reliable operation of the fire-fighting system is ensured, the purpose of adjusting the action value of the pressure release valve according to the water inlet pressure can be achieved through connection of the communicating pipe, and the pressure release valve is simple in structure and convenient to install and maintain.

Description

Technical Field

[0001] The utility model belongs to the technical field of water fire protection, and particularly relates to a pressure relief valve capable of automatically adjusting the action value according to the inlet pressure and a pump house applying the same. Background Technique

[0002] Article 5.1.6 of the Technical Code for Fire Protection Water Supply and Fire Hydrant Systems GB50974-2014 stipulates that the flow-head performance curve of the fire pump should be a smooth curve without humps and inflection points. The pressure at zero flow should not be greater than 140% of the design working pressure and should preferably be greater than 120% of the design working pressure. At the same time, Article 5.1.16 stipulates that: for a temporary high-pressure fire protection water supply system, technical measures should be taken to prevent the fire pump from idling and overheating at low flow rates. Therefore, when designing, a pressure relief valve is installed on the outlet main pipe of the fire pump, and the action pressure of the pressure relief valve is set between 120% and 140% of the pump head. When the pressure in the pipe network is too high and the pump flow rate is small, the pressure relief valve discharges water to prevent the pump from idling and overheating.

[0003] Article 4.2.1 of the Technical Code for Fire Protection Water Supply and Fire Hydrant Systems GB50974-2014 stipulates that: when the municipal water supply pipe network supplies water continuously, the fire protection water supply system can adopt the direct water supply of the municipal water supply pipe network; Article 7.1.2 of the Fire Prevention Design Standard for Subways GB51298-2018 stipulates that: fire protection water should preferably be supplied by the municipal water supply pipe network. For quite a number of fire protection systems, especially the subway fire protection system, the municipal direct supply of fire protection water is mostly adopted. Then, the action pressure of the pressure relief valve should not only consider the pump head of the fire pump, but also consider the influence of the superposition of the municipal pressure. In this case, the action pressure of the pressure relief valve is often set according to "(1.2 - 1.4) × pump head + municipal water pressure".

[0004] Taking the designed head of the pump as P, the head of the pump at zero flow ≤ 1.4P, the designed inlet water pressure of the municipal water supply as P0, and the designed dynamic pressure of the fire protection pipe network as P + P0, the action value of the pressure relief valve is P1 = 1.4P + P0. However, during the peak and trough of the municipal water pressure, the water pressure fluctuates greatly. Especially for subway projects, most of them are built in urban areas with dense population and large water consumption. The fluctuation range value of the municipal water pressure is P0 ± △P. When the fire pump is started during the low water consumption period, the municipal water pressure is relatively high, and the maximum municipal water pressure is P0 max = P0 + △P, the starting pressure of the fire pump is about 1.4P, and the pressure of the fire protection pipe network behind the pump = 1.4P + P0 + △P = P1 + △P > P1. It is equivalent to that the fire protection system has reached the action value of the pressure relief valve at the starting stage, resulting in the opening and discharging of the pressure relief valve and affecting fire extinguishing. When it is the peak water consumption period, the minimum municipal water pressure is P0 min= P0 - △P, the pressure of the fire protection pipe network after the pump = 1.4P + P0 - △P = P1 - △P < P1. That is, when the fire pump operates at low flow, 1.4P < the head of the pump < P1 - (P0 - △P). At this time, the fire pump may run idly at low flow, and the situation where the system pressure relief is not triggered yet may occur, resulting in deviation in the pressure control of the fire protection system at the same time.

[0005] Therefore, developing and designing a pressure relief valve that can automatically adjust the action value according to the inlet pressure to eliminate the influence of municipal water pressure fluctuations on the action of the pressure relief valve has become an urgent problem for us to solve currently. Utility Model Content

[0006] The utility model provides a pressure relief valve that can automatically adjust the action value according to the inlet pressure to solve the problems existing in the prior art. In the fire protection system directly supplied by the municipal water supply, this pressure relief valve can effectively eliminate the adverse effects of municipal water pressure fluctuations on system pressure relief and improve the accuracy of the action of the pressure relief valve.

[0007] The technical solution adopted by the utility model to solve this problem is:

[0008] A pressure relief valve that can automatically adjust the action value according to the inlet pressure, comprising:

[0009] The main valve body, which is divided into a pre-valve chamber A, a post-valve chamber B, and a diaphragm upper chamber C from bottom to top through a valve core and a diaphragm inside. The valve core and the diaphragm are connected by a guide rod;

[0010] The pilot valve body, which is divided into a pilot valve core lower chamber F, a pilot valve diaphragm lower chamber E, and a pilot valve body diaphragm upper chamber D from bottom to top through a pilot valve core and a pilot valve diaphragm inside. The pilot valve core and the pilot valve diaphragm are connected to a screw through a spring;

[0011] The conduit assembly, which includes multiple conduits connected between the main valve body and the pilot valve body.

[0012] In a technical solution, the conduit assembly includes:

[0013] The first conduit, one end of which is connected to the pre-valve chamber A, and the other end is respectively connected to the diaphragm upper chamber C and the pilot valve diaphragm lower chamber E through a branch pipe;

[0014] The second conduit, one end of which is connected to the diaphragm upper chamber C, and the other end is connected to the pilot valve core lower chamber F;

[0015] The third conduit, one end of which is connected to the post-valve chamber B, and the other end is connected to the pilot valve core lower chamber F.

[0016] In a technical solution, a Y-type filter and a stop valve are provided on the conduit.

[0017] In one technical solution, a pressure gauge is provided on the catheter.

[0018] In one technical solution, the upper end of the screw passes through the pilot valve body and is threadedly connected to the pilot valve body. By rotating the screw, the spring length can be adjusted to adjust the compression force of the spring.

[0019] In one technical solution, the upper chamber D of the diaphragm of the pilot valve body is connected to the water inlet pipe of the water pump through a connecting pipe, used to conduct the water pressure in the suction pipe to the upper chamber D of the pilot valve diaphragm.

[0020] In one technical solution, one end of the connecting pipe is connected to the upper chamber D of the pilot valve diaphragm, and the other end is reserved with a threaded interface.

[0021] In one technical solution, a stop valve and a Y-type filter are provided on the connecting pipe.

[0022] The second object of the present invention is to provide a pump house applying the pressure relief valve that can automatically adjust the action value according to the inlet water pressure. The inlet main pipe of the water pump in the pump house is connected to the municipal water supply pipe, the outlet main pipe of the water pump is connected to the fire hydrant network, a pressure relief pipe is also installed on the outlet main pipe of the water pump, the pressure relief valve is integrally installed on the pressure relief pipe, the upper chamber D of the diaphragm of the pilot valve body is connected to the inlet main pipe of the water pump in the pump house through a connecting pipe, and the water pressure in the inlet main pipe of the water pump is conducted to the upper chamber D of the pilot valve diaphragm through the connecting pipe.

[0023] In one technical solution, the front chamber A of the main valve body is connected to the inlet side of the pressure relief pipe, and the rear chamber B of the main valve body is connected to the outlet side of the pressure relief pipe.

[0024] The advantages and positive effects of the present utility model are:

[0025] 1. In the fire protection system with direct municipal water supply, the present utility model can effectively improve the action accuracy value of the pressure relief valve and ensure the safe and reliable operation of the fire protection system.

[0026] 2. The present utility model can achieve the purpose of adjusting the action value of the pressure relief valve according to the inlet water pressure through the connection of the communicating pipe, with a simple structure, convenient for installation and maintenance.

[0027] 3. The present utility model has good application prospects, especially in the subway fire protection project. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The technical solution of the present utility model will be further described in detail below in conjunction with the drawings and embodiments. However, it should be understood that these drawings are only designed for the purpose of explanation and therefore do not limit the scope of the present utility model. In addition, unless otherwise specified, these drawings are only intended to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.

[0029] Figure 1 is a schematic diagram of the internal structure of the present utility model;

[0030] Figure 2 is an installation schematic diagram of the present utility model.

[0031] Figure 1 In the figure: 1. main valve body; 2. valve core; 3. pilot valve body; 4. spring; 5. pilot valve core; 6. diaphragm; 7. guide rod; 8. screw rod; 9. pressure gauge; 10. Y-type filter; 11. globe valve; 12. connecting pipe; 13. first conduit; 14. second conduit; 15. third conduit; 16. pilot valve diaphragm; 17. threaded interface; 18. water pump. Specific embodiments

[0032] First of all, it should be noted that the following will specifically illustrate the specific structure, characteristics, advantages, etc. of the present utility model by way of examples. However, all descriptions are only for the purpose of illustration and should not be construed as any limitation to the present utility model. In addition, any single technical feature described or implied in each embodiment mentioned in this article, or any single technical feature shown or implied in each drawing, can still be arbitrarily combined or deleted between these technical features (or their equivalents), so as to obtain more other embodiments of the present utility model that may not be directly mentioned in this article. In addition, for the sake of simplifying the drawings, the same or similar technical features may only be marked at one place in the same drawing.

[0033] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "setting", "connection", "fixation", "swivel connection", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two elements or the interaction relationship between two elements. Unless otherwise clearly defined, 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 circumstances. The present utility model will be specifically described below in conjunction with the drawings. Embodiment 1

[0034] A pressure relief valve that can automatically adjust the action value according to the inlet water pressure, including a main valve body 1, a pilot valve body 3, and a conduit combination, etc., where:

[0035] The main valve body 1 is internally divided into a pre-valve chamber A, a post-valve chamber B, and a diaphragm upper chamber C from bottom to top through a valve core 2 and a diaphragm 6, and the valve core 2 and the diaphragm 6 are connected by a guide rod 7;

[0036] The pilot valve body 3 is internally divided from bottom to top into a lower chamber F of the pilot valve spool, a lower chamber E of the pilot valve diaphragm, and an upper chamber D of the pilot valve body diaphragm through the pilot valve spool 5 and the pilot valve diaphragm 16. The pilot valve spool 5 and the pilot valve diaphragm 16 are connected to the screw 8 through a spring 4.

[0037] The conduit assembly includes multiple conduits connected between the main valve body 1 and the pilot valve body 3.

[0038] As Figure 1 shown, the main valve body 1 of the pressure relief valve includes a guide rod 7, a diaphragm 6, a valve core 2, etc. Inside the main valve body 1, the guide rod 7 connects the diaphragm 6 and the valve core 2, and the area of the diaphragm 6 is larger than that of the valve core 2, dividing the inside of the main valve body 1 into an upper chamber C of the diaphragm, a pre-valve chamber A, and a post-valve chamber B; the pilot valve body 3 of the pilot valve includes a screw 8, a spring 4, a pilot valve diaphragm 16, a pilot valve spool 5, etc. Inside the pilot valve body 3, the screw 8 connects the pilot valve spool 5 and the pilot valve diaphragm 16, and the spring 4 is sleeved. By adjusting the length of the spring 4, the pressing force of the spring 4 can be adjusted to adjust the operating pressure value of the pilot valve; the pilot valve diaphragm 16 divides the pilot valve body 3 into an upper chamber D of the diaphragm and a lower chamber E of the diaphragm. The lower chamber E of the diaphragm is connected to the main valve through a conduit. In addition to the spring 4 in the upper chamber D of the diaphragm, it is also connected to the pipeline in front of the pump 18 of the water pump 18 through a connecting pipe 12, introducing the water pressure in front of the pump into the upper chamber D of the diaphragm of the pilot valve body 3, so that the operating value of the pilot valve is jointly determined by the pressing force of the spring and the pressure of the pipeline in front of the pump.

[0039] Furthermore, it can also be considered in this embodiment that the conduit assembly includes:

[0040] The first conduit 13, one end of which is connected to the pre-valve chamber A, and the other end is respectively connected to the upper chamber C of the diaphragm and the lower chamber E of the pilot valve diaphragm through a branch pipe. Among them: the upper chamber C of the diaphragm is connected to the front of the main valve A through the first conduit 13 to conduct the water pressure in the pre-valve chamber A to the upper chamber C of the diaphragm; the lower chamber E of the pilot valve diaphragm is connected to the pre-valve chamber A of the main valve through the first conduit 13 to conduct the water pressure in the pre-valve chamber A to the lower chamber E of the pilot valve diaphragm.

[0041] The second conduit 14, one end of which is connected to the upper chamber C of the diaphragm, and the other end is connected to the lower chamber F of the pilot valve spool.

[0042] The third conduit 15, one end of which is connected to the post-valve chamber B, and the other end is connected to the lower chamber F of the pilot valve spool, and is used to discharge the water in the upper chamber C of the main valve diaphragm.

[0043] Furthermore, it can also be considered in this embodiment that a Y-type filter and a stop valve are provided on the conduit 13 to prevent debris from blocking the conduit and facilitate disassembly and maintenance.

[0044] Furthermore, it can also be considered in this embodiment that a pressure gauge is provided on the conduit 13 to measure the water pressure in the pipe to determine the operating pressure value of the pressure relief valve.

[0045] Furthermore, it can also be considered in this embodiment that the upper end of the screw rod 8 passes through the pilot valve body 3 and is threadedly connected to the pilot valve body 3. By rotating the screw rod 8, the length of the spring 4 can be adjusted to adjust the pressing force of the spring.

[0046] Furthermore, it can also be considered in this embodiment that the upper chamber D of the pilot valve body diaphragm is connected to the water inlet pipe of the water pump through the connecting pipe 12, so as to conduct the water pressure in the water suction pipe to the upper chamber D of the pilot valve diaphragm.

[0047] Furthermore, it can also be considered in this embodiment that the connecting pipe 12 is the key point of this technical solution. The pressure relief valve product is equipped with a connecting pipe 12 of a standard length. One end of the connecting pipe 12 is connected to the upper chamber D of the pilot valve diaphragm, and the other end is provided with a threaded interface 17. The upper chamber D of the pilot valve body diaphragm is connected to the water suction pipe of the water pump through the connecting pipe 12, so as to conduct the water pressure in the water suction pipe to the upper chamber D of the pilot valve diaphragm. During installation, according to the actual situation of different pump rooms, corresponding connecting pipes can be equipped and docked with the threaded interfaces reserved on the connecting pipe of the pilot valve.

[0048] Furthermore, it can also be considered in this embodiment that a stop valve 11 and a Y-type filter 10 are provided on the connecting pipe 12 to prevent debris from blocking the conduit and facilitate disassembly and maintenance. Embodiment 2

[0049] A pump room applying the pressure relief valve capable of automatically adjusting the action value according to the inlet water pressure described in Embodiment 1. The inlet main pipe of the water pump 18 in the pump room is connected to the municipal water supply pipe, the outlet main pipe of the water pump 18 is connected to the fire hydrant network, and a pressure relief pipe is also installed on the outlet main pipe of the water pump 18. The pressure relief valve is integrally installed on the pressure relief pipe. The upper chamber D of the pilot valve body diaphragm is connected to the inlet main pipe of the water pump 18 in the pump room through the connecting pipe 12, and the water pressure in the inlet main pipe of the water pump is conducted to the upper chamber D of the pilot valve diaphragm through the connecting pipe 12.

[0050] Furthermore, it can also be considered in this embodiment that the front chamber A of the main valve body 1 is connected to the water inlet side of the pressure relief pipe, and the rear chamber B of the main valve body 1 is connected to the water outlet side of the pressure relief pipe. The arrow direction in the figure represents the water flow direction.

[0051] The specific implementation process of the above embodiment:

[0052] Please refer to Figure 2As shown in the installation position of the pressure relief valve, through the connecting pipe 12, the water pressure in the water inlet pipe of the water pump can be conducted to the upper chamber D of the pilot valve diaphragm, and this water pressure is the municipal water pressure P0. At the same time, by adjusting the screw 8 on the pilot valve, the length of the spring 4 can be compressed or relaxed to adjust the pressing force of the spring 4. Taking this pressing force as P2, according to the relevant specification requirements, adjust the pressure value P2 = P×(1.2 - 1.4). Then the action pressure value of this pressure relief valve is set as P1 = P2 + P0 = P×(1.2 - 1.4) + P0. When the water pressure in front of the valve A rises to be greater than P1, the water flow passes through the conduit 13 and enters the lower chamber E of the pilot valve diaphragm. Under the action of this water pressure, the spring 4 is compressed, and the pilot valve spool 5 rises. At this time, the water in the upper chamber C of the main valve diaphragm is discharged through the conduits 14 and 15. Under the action of the water pressure in front of the valve A, the main valve spool 2 opens, and the water flow is discharged, achieving the purpose of pipeline pressure relief.

[0053] When the water pressure in front of the main valve A drops to be less than P1, the water pressure at the lower chamber E of the pilot valve diaphragm decreases. Under the combined action of the spring and the water pressure in the upper chamber of the pilot valve, the pilot valve spool closes, and the water discharge from the upper chamber C of the main valve diaphragm stops, and water continues to be replenished through the conduit 13. When the water pressure in the upper chamber C of the diaphragm is the same as the water pressure in A inside the valve body, due to the area of the diaphragm being larger than that of the spool, under the action of the pressure difference, the spool 2 closes, and at this time the pipeline stops pressure relief.

[0054] Here, the function of automatically adjusting the action pressure value of this pressure reducing valve is emphasized. The upper chamber D of the pilot valve diaphragm is connected to the water inlet pipe of the water pump through the connecting pipe 12, and the municipal water pressure P0 is conducted to the upper chamber D of the pilot valve diaphragm. By adjusting the spring length, the action pressure value of the pressure relief valve is determined as P1 = P2 + P0. When the water pump is running, the water pressure in front of the main valve A of the pressure relief valve is the sum of the municipal water pressure P0 and the water pump boost. This water pressure is introduced into the lower chamber E of the diaphragm through the conduit 13. That is, the municipal water pressure is introduced into both the upper chamber D and the lower chamber E of the pilot valve diaphragm, and the municipal water pressures on both sides of the diaphragm cancel each other out, and the fluctuations of the municipal water pressure P0 also cancel each other out. In actual use, it can be manifested that this pressure relief valve automatically adjusts the action value according to the inlet water pressure, or it can be considered that this pressure relief valve can "filter" the influence of the municipal water pressure fluctuation, thereby improving the accuracy of its action pressure value, enabling the fire protection system to accurately and timely relieve pressure, and ensuring the stable and reliable operation of the fire protection system.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

[0056] The above embodiments have described the present utility model in detail, but the above content is only the preferred embodiment of the present utility model and cannot be considered as limiting the scope of implementation of the present utility model. Any equivalent changes and improvements made within the scope of the application of the present utility model shall still fall within the scope covered by the patent of the present utility model.

Claims

1. A pressure relief valve capable of automatically adjusting the action value according to the water inlet pressure, characterized in that: include: A main valve body (1) is divided from bottom to top into a valve front chamber A, a valve rear chamber B, and a diaphragm upper chamber C by a valve core (2) and a diaphragm (6), wherein the valve core (2) and the diaphragm (6) are connected by a guide rod (7); A pilot valve body (3) is divided from bottom to top into a pilot valve core lower chamber F, a pilot valve diaphragm lower chamber E, and a pilot valve body diaphragm upper chamber D by a pilot valve core (5) and a pilot valve diaphragm (16), wherein the pilot valve core (5) and the pilot valve diaphragm (16) are connected to a screw rod (8) via a spring (4); A conduit assembly comprises a plurality of conduits connected between a main valve body (1) and a pilot valve body (3).

2. A pressure relief valve capable of automatically adjusting the action value according to the water inlet pressure according to claim 1, characterized in that: The catheter assembly comprises: A first conduit (13), one end of which is connected to the valve front chamber A, and the other end of which is connected to the diaphragm upper chamber C and the pilot valve diaphragm lower chamber E through branch pipes; A second conduit (14), one end of which is connected to the upper cavity C of the diaphragm, and the other end of which is connected to the lower cavity F of the pilot valve core; The third conduit (15) has one end connected to the valve rear chamber B and the other end connected to the lower chamber F of the pilot valve core.

3. A pressure relief valve capable of automatically adjusting the action value according to the water inlet pressure according to claim 2, characterized in that: The conduit (13) is provided with a Y-type filter and a stop valve.

4. A pressure relief valve capable of automatically adjusting the action value according to the water inlet pressure according to claim 2, characterized in that: The conduit (13) is provided with a pressure gauge.

5. A pressure relief valve capable of automatically adjusting the action value according to the water inlet pressure according to claim 1, characterized in that: The upper end of the screw rod (8) passes through the pilot valve body (3) and is threadedly connected to the pilot valve body (3). By rotating the screw rod (8), the length of the spring (4) can be adjusted to adjust the pressing force of the spring.

6. A pressure relief valve capable of automatically adjusting the action value according to the water inlet pressure according to claim 1, characterized in that: The upper cavity D of the pilot valve body diaphragm is connected to the water inlet pipe of the water pump (18) via a connecting pipe (12) so as to transmit the water pressure in the water inlet pipe to the upper cavity D of the pilot valve diaphragm.

7. A pressure relief valve capable of automatically adjusting the operating value according to the water inlet pressure according to claim 6, characterized in that: One end of the connecting pipe (12) is connected to the upper cavity D of the pilot valve diaphragm, and the other end is reserved for a threaded interface (17).

8. A pressure relief valve capable of automatically adjusting the operating value according to the water inlet pressure according to claim 6, characterized in that: The connecting pipe (12) is provided with a stop valve (11) and a Y-type filter (10).

9. A pump room using a pressure relief valve capable of automatically adjusting an action value according to water inlet pressure as claimed in any one of claims 1 to 8, wherein the water inlet main pipe of the water pump (18) in the pump room is connected to a municipal water supply pipe, the water outlet main pipe of the water pump (18) is connected to a fire hydrant network, and a pressure relief pipe is also installed on the water outlet main pipe of the water pump (18), characterized in that: The pressure relief valve is integrally mounted on the pressure relief pipe, and the upper cavity D of the pilot valve body diaphragm is connected to the water inlet main pipe of the water pump (18) in the pump room through a connecting pipe (12). The water pressure in the water inlet main pipe of the water pump (18) is transmitted to the upper cavity D of the pilot valve diaphragm through the connecting pipe (12).

10. A pump room according to claim 9, characterized in that: The front valve cavity A of the main valve body (1) is connected to the water inlet side of the pressure relief pipe, and the rear valve cavity B of the main valve body (1) is connected to the water outlet side of the pressure relief pipe.

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