Differential pressure gauge with bidirectional pressure equalization protection structure

Abstract

This utility model discloses a differential pressure gauge with a bidirectional pressure equalization protection structure, including a gauge body, a high-pressure side inlet, and a low-pressure side inlet. The gauge also includes a bidirectional valve, comprising a high-pressure side channel, a low-pressure side channel, and two pressure-conducting valves. Each pressure-conducting valve includes a pressure equalization channel, a valve ball, and an elastic element. The side wall of the pressure equalization channel is provided with a pressure equalization inlet and a pressure equalization guide outlet. One end of the elastic element is fixedly installed, and the other end is fixed to the valve ball, with the elastic element supporting the valve ball and blocking the pressure equalization inlet. Therefore, this utility model's differential pressure gauge achieves bidirectional pressure equalization protection through two pressure-conducting valves. When the pressure difference across the gauge exceeds the limit, it automatically connects the high-pressure and low-pressure side channels to achieve rapid pressure equalization, reducing the pressure difference below a safe value and preventing damage to the gauge. It also features bidirectional response, zero power consumption, automatic reset characteristics, simple structure, and ease of implementation.

Description

Technical Field

[0001] This utility model relates to the field of industrial instrumentation technology, and in particular to a differential pressure gauge with a bidirectional pressure equalization protection structure. Background Technology

[0002] Differential pressure gauges are based on Bernoulli's theorem, which states that when a fluid passes through a narrow section of a pipe, its velocity increases, resulting in an increase in the fluid's kinetic energy and a decrease in static pressure. Therefore, for two points at different locations, if there is a difference in velocity between them, a differential pressure is generated. This differential pressure can be converted into flow rate or velocity for measurement. Existing differential pressure gauges include diaphragm type and bellows type, which measure the pressure difference ΔP through a high-pressure interface P1 and a low-pressure interface P2, where ΔP = |P1 - P2|.

[0003] During use, the following problems were found with existing differential pressure gauges: when the pressure on one side suddenly increases, such as P1 being much greater than P2, or when the instantaneous impact differential pressure exceeds the safety threshold, the sensitive elements of the differential pressure gauge, such as the diaphragm or Bourdon tube, are prone to plastic deformation or rupture, resulting in permanent damage; moreover, the existing one-way pressure relief valve can only protect against overpressure on one side and cannot cope with bidirectional differential pressure impacts; mechanical limit structures reduce measurement accuracy; and electronic cut-off systems are costly and require external power. Utility Model Content

[0004] To address the aforementioned shortcomings, the technical problem to be solved by this utility model is to provide a differential pressure gauge with a bidirectional pressure equalization protection structure. When the differential pressure exceeds the limit, the differential pressure gauge can automatically connect the high-pressure measurement channel and the low-pressure side channel to achieve rapid pressure equalization and reduce the differential pressure to below the safe value, thereby avoiding damage to the instrument. It also has the advantages of bidirectional response, zero power consumption, and automatic reset characteristics.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0006] A differential pressure gauge with a bidirectional pressure equalization protection structure includes a gauge body, a high-pressure inlet, and a low-pressure inlet. The gauge also includes a bidirectional valve, which comprises a high-pressure channel, a low-pressure channel, and two pressure-conducting valves. The high-pressure channel connects the gauge body and the high-pressure inlet; the low-pressure channel connects the gauge body and the low-pressure inlet. Each pressure-conducting valve includes a pressure equalization channel, a valve ball, and an elastic element disposed within the pressure equalization channel. The sidewall of the pressure equalization channel is provided with a pressure equalization outlet and a pressure equalization guide outlet. The pressure equalization outlet communicates with either the high-pressure channel or the low-pressure channel, and the pressure equalization guide outlet communicates with either the low-pressure channel or the high-pressure channel. One end of the elastic element is fixedly disposed, and the other end of the elastic element is fixed to the valve ball, and the elastic element supports the valve ball and blocks the pressure equalization outlet.

[0007] In a preferred embodiment, a guide structure is provided within the pressure equalization channel. The guide structure is located on the outer periphery of the pressure equalization outlet and is used to guide the valve ball.

[0008] In a preferred embodiment, the guiding structure is a guide cylinder, and the inner wall of the guide cylinder is provided with a trumpet-shaped guide plate, which is correspondingly arranged with the pressure equalization drainage port.

[0009] In a preferred embodiment, a fixing plate is further provided inside the pressure equalization channel, and one end of the elastic element is fixed to the fixing plate.

[0010] In a preferred embodiment, the elastic element is a spring.

[0011] In a preferred embodiment, the fixing plate is disposed on the outer periphery of the pressure equalization guide port.

[0012] In a preferred embodiment, the bidirectional valve further includes a housing, and the high-pressure side channel and the low-pressure side channel are arranged in parallel within the housing.

[0013] In a preferred embodiment, the pressure equalization channels of the two pressure-conducting valves are arranged in parallel and spaced apart within the housing.

[0014] In a preferred embodiment, the equalizing channel is arranged perpendicularly to the high-pressure side channel.

[0015] In a preferred embodiment, external threads are provided at both the high-pressure side inlet and the low-pressure side inlet.

[0016] The beneficial effects of this utility model after adopting the above technical solution are:

[0017] The differential pressure gauge with bidirectional pressure equalization protection structure of this utility model includes a differential pressure gauge body, a high-pressure side inlet and a low-pressure side inlet. The differential pressure gauge also includes a bidirectional valve, which includes a high-pressure side channel, a low-pressure side channel and two pressure-conducting valves. The high-pressure side channel connects the differential pressure gauge body and the high-pressure side inlet; the low-pressure side channel connects the differential pressure gauge body and the low-pressure side inlet. Each pressure-conducting valve includes a pressure equalization channel and a valve ball and an elastic element disposed in the pressure equalization channel. The side wall of the pressure equalization channel is respectively provided with a pressure equalization outlet and a pressure equalization guide outlet. The pressure equalization outlet is connected to the high-pressure side channel or the low-pressure side channel, and the pressure equalization guide outlet is connected to the low-pressure side channel or the high-pressure side channel. One end of the elastic element is fixedly disposed, and the other end of the elastic element is fixed to the valve ball, and the elastic element supports the valve ball and blocks the pressure equalization outlet. As can be seen, the differential pressure gauge of this utility model achieves bidirectional pressure equalization protection through two pressure-conducting valves. When the differential pressure exceeds the limit, it automatically opens the high-pressure side channel and the low-pressure side channel to achieve rapid pressure equalization and reduce the differential pressure to below the safe value to avoid damage to the differential pressure gauge. Moreover, this utility model has the advantages of bidirectional response, zero power consumption, automatic reset characteristics, simple structure and easy implementation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the differential pressure gauge in the utility model.

[0019] Figure 2 This is a cross-sectional view of the two-way valve in this utility model;

[0020] Figure 3 This is a schematic diagram of the differential pressure gauge in its normal state according to this utility model;

[0021] Figure 4 This is a schematic diagram of the high-pressure side pressure ultra-high medium flow direction in this utility model;

[0022] Figure 5 This is a schematic diagram of the flow direction of the medium with ultra-high pressure on the low-pressure side in this utility model;

[0023] Figure 6 This is a front view of the two-way valve in this utility model;

[0024] Figure 7 yes Figure 6 Cross-sectional view along the AA direction;

[0025] Figure 8 This is a schematic diagram of the two-way valve in this utility model;

[0026] In the diagram: 1-Two-way valve, 2-Differential pressure gauge body, 3-External thread, 4-Equalizing channel, 5-Valve ball, 6-Elastic element, 7-Pressure-conducting valve, 8-Guide structure, 10-High-pressure equalizing valve, 11-Low-pressure equalizing valve, 12-Housing, 101-High-pressure side channel, 102-Low-pressure equalizing spring, 103-Low-pressure equalizing channel, 104-Low-pressure equalizing valve ball, 105-High-pressure side inlet, 106-Low-pressure side channel, 107-High-pressure equalizing spring, 108-High-pressure equalizing channel, 109-High-pressure equalizing valve ball, 110-Low-pressure side inlet, 111-Fixed plate, 112-High-pressure equalizing outlet, 113-Low-pressure equalizing outlet, 114-Low-pressure equalizing guide outlet, 115-High-pressure equalizing guide cylinder, 116-Low-pressure equalizing guide cylinder. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0028] It should be noted that in the description of this utility model, the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0029] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] like Figures 1 to 8 As shown, a differential pressure gauge with a bidirectional pressure equalization protection structure includes a differential pressure gauge body 2, a high-pressure side inlet 105, and a low-pressure side inlet 110. The differential pressure gauge of this invention also includes a bidirectional valve 1, which includes a high-pressure side channel 101, a low-pressure side channel 106, and two pressure-conducting valves 7. In this embodiment, the bidirectional valve 1 also includes a housing 12, with the high-pressure side channel 101 and the low-pressure side channel 106 arranged parallel to each other within the housing 12. The high-pressure side channel 101 connects the differential pressure gauge body 2 and the high-pressure side inlet 105; the low-pressure side channel 106 connects the differential pressure gauge body 2 and the low-pressure side inlet 110. External threads 3 are provided in the high-pressure side inlet 105 and the low-pressure side inlet 110 for connection to the pipeline under test, etc.

[0031] like Figure 2 As shown, each pressure-controlled valve 7 includes a pressure equalization channel 4, a valve ball 5, and an elastic element 6 disposed within the pressure equalization channel 4. The sidewalls of the pressure equalization channel 4 are respectively provided with a pressure equalization inlet and a pressure equalization guide outlet. The pressure equalization inlet communicates with either the high-pressure side channel 101 or the low-pressure side channel 106, and the pressure equalization guide outlet communicates with either the low-pressure side channel 106 or the high-pressure side channel 101. That is, the pressure equalization channel 4 is simultaneously connected to both the high-pressure side channel 101 and the low-pressure side channel 106. One end of the elastic element 6 is fixedly disposed, and the other end is fixed to the valve ball 5, supporting the valve ball 5 in blocking the pressure equalization inlet. In a preferred embodiment, the pressure equalization channels of the two pressure-controlled valves are arranged parallel to each other within the housing 12, with the pressure equalization channels perpendicular to the high-pressure side channel 101. This structure facilitates manufacturing and improves the accuracy of differential pressure measurement. Of course, the pressure equalization channel 4 only needs to communicate with both the high-pressure side channel 101 and the low-pressure side channel 106; it does not need to be vertically positioned.

[0032] like Figure 2 As shown, in this invention, each pressure-conducting valve 7 has a guide structure 8 within its pressure equalization channel 4. The guide structure 8 is located on the outer periphery of the pressure equalization inlet and serves to guide the valve ball 5. Specifically, the guide structure 8 is a guide cylinder, and the inner wall of the guide cylinder is provided with a trumpet-shaped guide plate, which is correspondingly positioned to the pressure equalization inlet. Under the action of the guide structure 8, the valve ball 5 can move reliably.

[0033] like Figure 2 As shown, in this utility model, each pressure-conducting valve 7 is further provided with a fixing plate 111 in the pressure equalization channel 4, and one end of the elastic element 6 is fixed on the fixing plate 111. Specifically, the fixing plate 111 is located on the outer periphery of the pressure equalization guide port. In a preferred embodiment, the elastic element 6 is a spring, and the extension and retraction direction of the spring is from the pressure equalization guide port to the pressure equalization outlet, so as to reliably drive the valve ball 5 to move.

[0034] like Figures 2 to 7 As shown, for clearer description, the two pressure-conducting valves 7 are defined as a high-pressure equalization valve 10 and a low-pressure equalization valve 11, respectively. The high-pressure equalization valve 10 specifically includes: a high-pressure equalization channel 108, a high-pressure equalization valve ball 109, a high-pressure equalization spring 107, and a high-pressure equalization guide cylinder 115. The high-pressure equalization channel 108 has a high-pressure equalization outlet 112 and a high-pressure equalization guide port at both ends, respectively. The low-pressure equalization valve 11 specifically includes: a low-pressure equalization channel 103, a low-pressure equalization valve ball 104, a low-pressure equalization spring 102, and a low-pressure equalization guide cylinder 116. The low-pressure equalization channel 103 has a low-pressure equalization outlet 113 and a low-pressure equalization guide port 114 at both ends, respectively.

[0035] like Figures 1 to 8 As shown in the figure, when using this utility model, the high pressure outlet side of the two-way valve 1 is connected to the high pressure inlet of the differential pressure gauge, and the low pressure outlet side of the two-way valve 1 is connected to the low pressure inlet of the differential pressure gauge; the high pressure inlet 105 of the two-way valve 1 is connected to the high pressure point of the measured point using the external thread 3, and the low pressure inlet 110 of the two-way valve 1 is connected to the low pressure point of the measured point.

[0036] The working process of this utility model specifically includes:

[0037] Normal state: such as Figure 3 As shown, the high-pressure side inlet 105 of the two-way valve 1 is higher than the low-pressure side inlet 110, and the pressure difference does not exceed the spring force value. Therefore, the ball 104 of the low-pressure equalizing valve is kept sealed by the pressure of the high-pressure side channel 101, and the ball 109 of the high-pressure equalizing valve is kept sealed by the pressure of the low-pressure side channel 106.

[0038] Overpressure condition (sudden increase in pressure at the high-pressure side inlet 105): such as Figure 4As shown, the pressure at the high-pressure side inlet 105 rises sharply, exceeding the spring force. The pressure in the high-pressure side channel 101 pushes the low-pressure equalizing valve ball 104, while simultaneously compressing the high-pressure equalizing valve ball 109 and the high-pressure equalizing spring 107. The high-pressure equalizing channel 108 opens, and the medium enters the high-pressure side channel 101 from the high-pressure equalizing inlet 112, and then flows from the high-pressure equalizing guide port to the low-pressure side channel 106, thus achieving pressure equalization.

[0039] Overpressure condition (sudden increase in pressure at inlet 110 on the low-pressure side): such as Figure 5 As shown, the pressure at the low-pressure side inlet 110 suddenly increases, exceeding the spring force. The pressure in the low-pressure side channel 106 pushes the ball 109 of the high-pressure equalizing valve, while compressing the ball 104 of the low-pressure equalizing valve and the low-pressure equalizing spring 102. The low-pressure equalizing channel 103 opens, and the medium enters the low-pressure side channel 106 from the low-pressure equalizing inlet 113, and then flows from the low-pressure equalizing guide port 114 to the high-pressure side channel 101, thus achieving pressure equalization.

[0040] Automatic reset: When the pressure of the high-pressure side channel 101 and the low-pressure side channel 106 is balanced, the high-pressure equalizing spring 107 or the low-pressure equalizing spring 102 pushes the high-pressure equalizing valve ball 109 or the low-pressure equalizing valve ball 104 to close the high-pressure equalizing channel 108 or the low-pressure equalizing channel 103, thereby achieving automatic reset.

[0041] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications made within the spirit and principles of the present utility model, or improvements to a differential pressure gauge with a bidirectional pressure equalization protection structure, should be included within the protection scope of the present utility model.

Claims

1. A differential pressure gauge with a bidirectional pressure equalization protection structure, comprising a differential pressure gauge body, a high-pressure side inlet, and a low-pressure side inlet, characterized in that, The differential pressure gauge also includes a two-way valve, which includes a high-pressure side channel, a low-pressure side channel, and two pressure-conducting valves. The high-pressure side channel connects the differential pressure gauge body and the high-pressure side inlet; The low-pressure side channel connects the differential pressure gauge body and the low-pressure side inlet; Each pressure-conducting valve includes a pressure equalization channel and a valve ball and an elastic element disposed within the pressure equalization channel. The side wall of the pressure equalization channel is provided with a pressure equalization outlet and a pressure equalization guide outlet. The pressure equalization outlet is connected to the high-pressure side channel or the low-pressure side channel, and the pressure equalization guide outlet is connected to the low-pressure side channel or the high-pressure side channel. One end of the elastic element is fixedly disposed, and the other end of the elastic element is fixed to the valve ball. The elastic element supports the valve ball and blocks the pressure equalization outlet.

2. The differential pressure gauge with a bidirectional pressure equalization protection structure according to claim 1, characterized in that, A guide structure is provided in the pressure equalization channel. The guide structure is located on the outer periphery of the pressure equalization outlet and is used to guide the valve ball.

3. The differential pressure gauge with a bidirectional pressure equalization protection structure according to claim 2, characterized in that, The guiding structure is a guide cylinder, and the inner wall of the guide cylinder is provided with a trumpet-shaped guide plate, which is correspondingly arranged with the pressure equalization drainage port.

4. The differential pressure gauge with a bidirectional pressure equalization protection structure according to claim 1, characterized in that, A fixing plate is also provided inside the pressure equalization channel, and one end of the elastic element is fixed to the fixing plate.

5. The differential pressure gauge with a bidirectional pressure equalization protection structure according to claim 4, characterized in that, The elastic element is a spring.

6. The differential pressure gauge with a bidirectional pressure equalization protection structure according to claim 5, characterized in that, The fixing plate is located on the outer periphery of the pressure equalization guide port.

7. The differential pressure gauge with a bidirectional pressure equalization protection structure according to claim 1, characterized in that, The bidirectional valve also includes a housing, and the high-pressure side channel and the low-pressure side channel are arranged in parallel within the housing.

8. The differential pressure gauge with a bidirectional pressure equalization protection structure according to claim 7, characterized in that, The pressure equalization channels of the two pressure-conducting valves are arranged in parallel and spaced apart within the housing.

9. The differential pressure gauge with a bidirectional pressure equalization protection structure according to claim 7, characterized in that, The equalizing channel is arranged perpendicularly to the high-pressure side channel.

10. The differential pressure gauge with a bidirectional pressure equalization protection structure according to claim 1, characterized in that, External threads are provided at the high-pressure side inlet and the low-pressure side inlet.

Images