Novel spring type pressure gauge

Abstract

The utility model discloses a novel spring type pressure gauge, which relates to the technical field of pressure monitoring and comprises a shell, a lining is arranged in the shell, a dial plate is mounted on the lining in a matched manner, a bottom plate is fixedly mounted in the shell, a limiting seat and a positioning seat are arranged on one side of the bottom plate, a gear fixing seat is mounted on one side of the positioning seat in a matched manner, and a spring is arranged on the gear fixing seat. A transmission gear is installed between the gear fixing base and the bottom plate in a matched mode, a pointer is fixedly matched with the upper end of the transmission gear, a hairspring is installed on the lower side of the bottom plate in a matched mode, and the hairspring and the transmission gear are arranged in a matched mode. According to the utility model, a copper pipe pressure gauge with high requirements is abandoned, and the spring is adopted, so that the pressure gauge is low in selling price, has good impact resistance and adaptability, and can be put into use by replacing the corresponding spring when the error is too large after the pressure gauge is used for a period of time, thereby greatly reducing the maintenance cost of the pressure gauge.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure monitoring, and particularly relates to a new spring type pressure gauge. Background Technique

[0002] A pressure gauge is an important measuring tool. It uses an elastic element as a sensitive element and can measure and indicate the instrument with a pressure higher than the ambient pressure. The pressure gauge is almost used in all industrial processes and scientific research fields. Especially, it has a wide application in the fields of thermal pipeline network, oil and gas transmission, water supply and gas supply systems, vehicle maintenance, etc. In industrial production, the pressure gauge is used to monitor the pressure changes of pipelines and equipment to ensure the safe operation of the equipment; in manufacturing, it is used to monitor the pressure of production equipment to improve production efficiency. In the field of aerospace, the pressure gauge is a key device for monitoring important parameters such as the oxygen pressure inside the aircraft.

[0003] At present, all pressure gauges drive the pointer to rotate through a deformed circular arc copper tube (B in the attached Figure 11 ). After the pressure enters the circular arc copper tube, the thin copper tube deforms due to the internal and external pressures, and then drives the pointer at one end of the copper tube to rotate. Then, the corresponding pointer is used to display the value. However, in order to display the accuracy, the copper tube needs to be made very thin. In this way, the pressure gauge will become very fragile and will also show the situation that the gauge does not return to zero or the indication is inaccurate due to the passage of time. Content of the Utility Model

[0004] In order to solve the problems of the pressure gauge being fragile and inaccurate after being used for a period of time as mentioned in the above background technique, the purpose of the utility model is to provide a new spring type pressure gauge.

[0005] To achieve the above purpose, the utility model provides the following technical solution: a new spring type pressure gauge, including a housing. A bushing is arranged inside the housing. A dial is fitted and installed on the bushing. A bottom plate is fixedly installed inside the housing. A limit seat and a positioning seat are arranged on one side of the bottom plate. A gear fixing seat is fitted and installed on one side of the positioning seat. A transmission gear is fitted and installed between the gear fixing seat and the bottom plate. A pointer is fixedly fitted at the upper end of the transmission gear. A hairspring is fitted and installed on the lower side of the bottom plate. The hairspring is arranged in cooperation with the transmission gear;

[0006] A reduction gear is also fitted and installed between the gear fixing seat and the bottom plate. A rack is movably fitted on the positioning seat. The rack meshes with the reduction gear, and the reduction gear meshes with the transmission gear;

[0007] A pressing seat is fitted and installed on one side of the positioning seat. A spring fixing seat is fitted and installed between the positioning seat and the pressing seat. A connecting nozzle is fitted and installed on one side of the pressing seat;

[0008] A return spring is installed between the rack and the positioning seat. A piston is installed in the connecting nozzle in a sliding fit manner. The piston is in a sliding fit with both the pressing seat and the spring fixing seat. One end of the piston is arranged in cooperation with the rack. A limiting ring is sleeved and fixed on the piston, and a piston sealing ring is installed in cooperation with the limiting ring.

[0009] Preferably, the rack is in the shape of the letter "U".

[0010] Preferably, a first spring is sleeved and slidably fitted on the piston, and the first spring is located between the spring fixing seat and the limiting ring.

[0011] Preferably, a second spring is sleeved and slidably fitted on the piston, and the second spring is located between the limiting ring and the connecting nozzle.

[0012] Preferably, a soft diaphragm is installed between the positioning seat and the pressing seat. A diaphragm fixing piece is installed on one side of the soft diaphragm, and the diaphragm fixing piece is arranged in cooperation with the rack.

[0013] Preferably, a fourth spring is installed between the diaphragm fixing piece and the connecting nozzle.

[0014] Preferably, a transparent cover is installed on the outer shell.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] 1. The pressure gauge of the present utility model abandons the technology of driving the pointer to rotate by the deformation of the commonly used arc-shaped copper tube at present, and adopts a corresponding spring to control the rotation amplitude of the pointer. When positive pressure is generated by the intake of air at the connecting nozzle, the first spring is compressed, the piston pushes the rack, the rack drives the reduction gear to rotate, and the reduction gear controls the rotation of the pointer through the transmission gear; when negative pressure is generated inside by the extraction of air at the connecting nozzle, the second spring is compressed, the piston pushes the rack, the rack drives the reduction gear to rotate, and the reduction gear controls the rotation of the pointer through the transmission gear. According to the deformation distance of the corresponding spring, the piston will push the rack forward by a corresponding distance. The return spring always keeps the rack in contact with the piston. The higher the air pressure, the greater the displacement of the rack, and thus the larger the rotation angle of the pointer. Using a spring can facilitate replacement on the one hand and transportation on the other hand, reducing the damage of the pressure gauge caused by bumps during transportation, and thus greatly improving the service life of the present utility model.

[0017] 2. Since the present utility model abandons the high-requirement copper tube pressure gauge and adopts a spring, the present utility model has a low selling price, good impact resistance and adaptability, solves the disadvantages of the current copper tube type pressure gauge being not drop-resistant and having poor adaptability, and when the error of the pressure gauge is too large after being used for a period of time, it can be put into use again by replacing the corresponding spring, thus greatly reducing the maintenance cost of the pressure gauge. Description of the Drawings

[0018] Figure 1 Schematic diagram of the internal structure of a new spring-type pressure gauge of the present utility model

[0019] Figure 2 Schematic diagram of the installation position of the dial of a new spring-type pressure gauge of the present utility model.

[0020] Figure 3 Schematic diagram of the basic structure of a new spring-type pressure gauge of the present utility model

[0021] Figure 4 Schematic diagram of the installation position of the hairspring of a new spring-type pressure gauge of the present utility model

[0022] Figure 5 Schematic diagram of the installation position of the gear fixing seat of a new spring-type pressure gauge of the present utility model

[0023] Figure 6 Schematic diagram of the cooperation between gears of a new spring-type pressure gauge of the present utility model

[0024] Figure 7 Of a new spring-type pressure gauge of the present utility model Figure 3 Front view

[0025] Figure 8 Partial cross-sectional view of Embodiment 1 of a new spring-type pressure gauge of the present utility model

[0026] Figure 9 Partial cross-sectional view of Embodiment 2 of a new spring-type pressure gauge of the present utility model

[0027] Figure 10 Partial cross-sectional view of Embodiment 3 of a new spring-type pressure gauge of the present utility model

[0028] Figure 11 Basic structure diagram of the current copper tube type pressure gauge

[0029] In the figure: 101, housing; 102, transparent cover; 103, dial; 104, pointer; 105, transmission gear; 106, bottom plate; 107, limit seat; 108, positioning seat; 109, rack; 110, reduction gear; 111, hairspring; 112, gear fixing seat; 113, connecting nozzle; 114, bushing; 116, return spring; 117, piston; 118, first spring; 119, second spring; 120, piston seal ring; 121, spring fixing seat; 122, pressing seat; 124, limit ring; 125, flexible diaphragm; 126, diaphragm fixing piece; 127, fourth spring. Detailed implementation mode

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work belong to the scope of protection of the present invention.

[0031] As the first embodiment of this application, refer to Figures 1-8 As shown, a new spring-type pressure gauge provided in this embodiment can be used for the monitoring of positive and negative pressures, including a housing 101. A bushing 114 is provided inside the housing 101. A dial 103 is fitted on the bushing 114. A bottom plate 106 is fixedly installed inside the housing 101. A limit seat 107 and a positioning seat 108 are provided on one side of the bottom plate 106. A gear fixing seat 112 is fitted on one side of the positioning seat 108. A transmission gear 105 is fitted between the gear fixing seat 112 and the bottom plate 106. A pointer 104 is fixedly fitted at the upper end of the transmission gear 105. A hairspring 111 is fitted on the lower side of the bottom plate 106. The hairspring 111 is arranged in cooperation with the transmission gear 105. A transparent cover 102 is fitted on the housing 101.

[0032] A reduction gear 110 is also fitted between the gear fixing seat 112 and the bottom plate 106. A rack 109 is movably fitted on the positioning seat 108. The rack 109 meshes with the reduction gear 110. The reduction gear 110 meshes with the transmission gear 105. The rack 109 is in the shape of the letter "U". Engagement teeth are provided on the rack 109 for meshing with the reduction gear 110. The reduction gear 110 is made by coaxially welding a large gear and a small gear. The small gear meshes with the rack 109. The large gear meshes with the transmission gear 105. The reduction gear 110 can increase the torque on the one hand and improve the movement accuracy and smoothness of the transmission gear on the other hand, thereby improving the value read by the pointer 104.

[0033] A pressing seat 122 is fitted on one side of the positioning seat 108. A spring fixing seat 121 is fitted between the positioning seat 108 and the pressing seat 122. A connecting nozzle 113 is fitted on one side of the pressing seat 122. A return spring 116 is fitted between the rack 109 and the positioning seat 108. A piston 117 is slidably fitted inside the connecting nozzle 113. The piston 117 is slidably fitted with both the pressing seat 122 and the spring fixing seat 121. One end of the piston 117 is arranged in cooperation with the rack 109. A limit ring 124 is sleeved and fixed on the piston 117. A piston seal ring 120 is fitted on the limit ring 124.

[0034] A first spring 118 is sleeved on and slidably engaged with the piston 117. The first spring 118 is located between the spring fixed seat 121 and the limit ring 124. A second spring 119 is sleeved on and slidably engaged with the piston 117. The second spring 119 is located between the limit ring 124 and the connection nozzle 113. The first spring 118 and the second spring 119 are respectively located on both sides of the limit ring 124. The first spring 118 and the second spring 119 are respectively used for positive pressure and negative pressure.

[0035] When this embodiment is in use, the piston 117 will compress the corresponding spring (the first spring 118 or the second spring 119 in this embodiment) and cause it to deform. At the same time, according to the deformation distance of the corresponding spring, the piston 117 will push the rack 109 forward by a corresponding distance. The return spring 116 always keeps the rack 109 in contact with the piston 117. The higher the air pressure, the greater the displacement of the rack 109, and thus the greater the rotation angle of the pointer 104.

[0036] It should be further noted that when positive pressure is generated by the intake of the connection nozzle 113, the first spring 118 is compressed, the piston 117 pushes the rack 109, and the rack 109 drives the reduction gear 110 to rotate. The reduction gear 110 controls the rotation of the pointer 104 through the transmission gear 105. When negative pressure is generated inside by the extraction of the connection nozzle 113, the second spring 119 is compressed, the piston 117 pushes the rack 109, and the rack 109 drives the reduction gear 110 to rotate. The reduction gear 110 controls the rotation of the pointer 104 through the transmission gear 105 (in the opposite direction of the rotation when the inside of the connection nozzle 113 is under positive pressure).

[0037] As the second embodiment of the present application, refer to Figures 1-7 、 Figure 9 As shown, a spring-type new pressure gauge provided in this embodiment includes a housing 101. A bushing 114 is provided inside the housing 101. A dial 103 is fitted and installed on the bushing 114. A bottom plate 106 is fixedly installed inside the housing 101. A limit seat 107 and a positioning seat 108 are provided on one side of the bottom plate 106. A gear fixed seat 112 is fitted and installed on one side of the positioning seat 108. A transmission gear 105 is fitted and installed between the gear fixed seat 112 and the bottom plate 106. A pointer 104 is fixedly engaged with the upper end of the transmission gear 105. A hairspring 111 is fitted and installed on the lower side of the bottom plate 106. The hairspring 111 is arranged in cooperation with the transmission gear 105. A transparent cover 102 is fitted and installed on the housing 101.

[0038] A reduction gear 110 is also installed between the gear fixing seat 112 and the bottom plate 106 in a mating manner. A rack 109 is movably mated with the positioning seat 108. The rack 109 meshes with the reduction gear 110, and the reduction gear 110 meshes with the transmission gear 105. The rack 109 is provided with engaging teeth for meshing with the reduction gear 110. The reduction gear 110 is made by coaxially welding a large gear and a small gear. The small gear meshes with the rack 109, and the large gear meshes with the transmission gear 105. On the one hand, the reduction gear 110 can increase the torque, and on the other hand, it can improve the movement accuracy and smoothness of the transmission gear, thereby improving the value read by the pointer 104.

[0039] A pressing seat 122 is installed on one side of the positioning seat 108 in a mating manner. A spring fixing seat 121 is installed between the positioning seat 108 and the pressing seat 122 in a mating manner. A connecting nozzle 113 is installed on one side of the pressing seat 122 in a mating manner. A return spring 116 is installed between the rack 109 and the positioning seat 108 in a mating manner. A piston 117 is slidably installed in the connecting nozzle 113. The piston 117 is slidably mated with both the pressing seat 122 and the spring fixing seat 121. One end of the piston 117 is arranged in cooperation with the rack 109. A limiting ring 124 is sleeved and fixed on the piston 117, and a piston seal ring 120 is installed on the limiting ring 124 in a mating manner.

[0040] The rack 109 is in the shape of the letter "U". A first spring 118 is sleeved and slidably mated with the piston 117. The first spring 118 is located between the spring fixing seat 121 and the limiting ring 124.

[0041] When this embodiment is in use, the piston 117 will compress the corresponding first spring 118 and cause it to deform. At the same time, according to the deformation distance of the first spring 118, the piston 117 will push the rack 109 forward by a corresponding distance. The return spring 116 always keeps the rack 109 in contact with the piston 117. The higher the air pressure, the greater the displacement of the rack 109, and thus the greater the rotation angle of the pointer 104.

[0042] It should be further noted that when the pressure gauge for monitoring positive pressure in this embodiment is in use, the connecting nozzle 113 intakes air to generate positive pressure. The first spring 118 is compressed, the piston 117 pushes the rack 109, and the rack 109 drives the reduction gear 110 to rotate. The reduction gear 110 controls the rotation of the pointer 104 through the transmission gear 105.

[0043] As the third embodiment of this application, refer to Figures 1-7 、 Figure 10As shown in the figure, a new type of spring pressure gauge provided in this embodiment includes a housing 101. Inside the housing 101, there is a bushing 114. A dial 103 is fitted and installed on the bushing 114. A bottom plate 106 is fixedly installed inside the housing 101. On one side of the bottom plate 106, there are a limit seat 107 and a positioning seat 108. On one side of the positioning seat 108, a gear fixing seat 112 is fitted and installed. A transmission gear 105 is fitted and installed between the gear fixing seat 112 and the bottom plate 106. At the upper end of the transmission gear 105, a pointer 104 is fixedly fitted. A hairspring 111 is fitted and installed on the lower side of the bottom plate 106. The hairspring 111 is arranged in cooperation with the transmission gear 105. A transparent cover 102 is fitted and installed on the housing 101.

[0044] A reduction gear 110 is also fitted and installed between the gear fixing seat 112 and the bottom plate 106. A rack 109 is movably fitted on the positioning seat 108. The rack 109 meshes with the reduction gear 110. The reduction gear 110 meshes with the transmission gear 105. The rack 109 is provided with engaging teeth for meshing with the reduction gear 110. The reduction gear 110 is made by coaxially welding a large gear and a small gear. The small gear meshes with the rack 109, and the large gear meshes with the transmission gear 105. The reduction gear 110 can increase the torque on the one hand and improve the movement accuracy and smoothness of the transmission gear on the other hand, thereby improving the value read by the pointer 104.

[0045] On one side of the positioning seat 108, a pressing seat 122 is fitted and installed. A spring fixing seat 121 is fitted and installed between the positioning seat 108 and the pressing seat 122. On one side of the pressing seat 122, a connecting nozzle 113 is fitted and installed. A return spring 116 is fitted and installed between the rack 109 and the positioning seat 108. The rack 109 is in the shape of the letter "U".

[0046] A flexible diaphragm 125 is fitted and installed between the positioning seat 108 and the pressing seat 122. On one side of the flexible diaphragm 125, a diaphragm fixing piece 126 is fitted and installed. The diaphragm fixing piece 126 is arranged in cooperation with the rack 109. A fourth spring 127 is fitted and installed between the diaphragm fixing piece 126 and the connecting nozzle 113.

[0047] It should be further noted that, with reference to Figure 10 , when the flexible diaphragm 125 is evacuated by the connecting nozzle 113 on the right side to generate negative pressure during the use of this embodiment, the flexible diaphragm 125 will compress the fourth spring 127, causing the fourth spring 127 to be compressed and deformed. The rack 109 will displace under the action of the return spring 116. At the same time, according to the corresponding displacement distance of the forward displacement of the rack 109, the rotation angle of the pointer 104 can be confirmed, and then a reading is generated through the dial 103.

[0048] As shown in Table 1 below, the test values of 15 pressure gauges in the third embodiment are presented. The readings are for the corresponding negative pressure conditions (unit: Kpa), and the serial numbers indicate which pressure gauge it is. As can be seen from the figure, the error is within the controllable range (the maximum error is ±2 Kpa).

[0049]

[0050] Table 1 Measurement data of several pressure gauges

[0051] Refer to Figure 11 , which is the current copper tube type pressure gauge. The gas enters the copper tube B from the black arrow. The internal and external air pressures of the copper tube B are inconsistent and deform, thereby driving the pointer to rotate. This copper tube type pressure gauge is extremely easy to damage after being collided. Moreover, after being used for a period of time, this copper tube type pressure gauge will have a continuous increase in error due to metal fatigue. In addition, this copper tube type pressure gauge is not easy to repair and is expensive.

[0052] In this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0053] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A new type of spring-type pressure gauge, comprising a housing (101), a bushing (114) is provided inside the housing (101), a dial (103) is mounted on the bushing (114), and the characteristics are: A bottom plate (106) is fixedly installed in the housing (101), a limiting seat (107) and a positioning seat (108) are provided on one side of the bottom plate (106), a gear fixing seat (112) is installed on one side of the positioning seat (108), a transmission gear (105) is installed between the gear fixing seat (112) and the bottom plate (106), a pointer (104) is fixedly installed on the upper end of the transmission gear (105), a hairspring (111) is installed on the lower side of the bottom plate (106), and the hairspring (111) is arranged in cooperation with the transmission gear (105); A reduction gear (110) is also installed between the gear fixing seat (112) and the bottom plate (106); a rack (109) is movably mounted on the positioning seat (108); the rack (109) is meshed with the reduction gear (110); and the reduction gear (110) is meshed with the transmission gear (105); A pressing seat (122) is installed on one side of the positioning seat (108), a spring fixing seat (121) is installed between the positioning seat (108) and the pressing seat (122), and a connecting nozzle (113) is installed on one side of the pressing seat (122); A return spring (116) is installed between the rack (109) and the positioning seat (108), a piston (117) is installed in a sliding manner in the connecting nozzle (113), the piston (117) is slidably fitted with the clamping seat (122) and the spring fixing seat (121), one end of the piston (117) is arranged in cooperation with the rack (109), a limiting ring (124) is sleeved and fixed on the piston (117), and a piston sealing ring (120) is installed in cooperation with the limiting ring (124).

2. A new spring-type pressure gauge according to claim 1, characterized in that: The rack (109) is in the shape of the letter "U".

3. A new spring-type pressure gauge according to claim 1, characterized in that: A first spring (118) is sleeved and slidably fitted on the piston (117), and the first spring (118) is located between a spring fixing seat (121) and a limiting ring (124).

4. A new spring-type pressure gauge according to claim 3, characterized in that: A second spring (119) is sleeved and slidably fitted on the piston (117), and the second spring (119) is located between the limiting ring (124) and the connecting nozzle (113).

5. According to claim 2, a new type of spring-type pressure gauge is characterized in that: A soft diaphragm (125) is installed between the positioning seat (108) and the pressing seat (122), a diaphragm fixing plate (126) is installed on one side of the soft diaphragm (125), and the diaphragm fixing plate (126) is arranged in cooperation with the rack (109).

6. A new spring-type pressure gauge according to claim 5, characterized in that: A fourth spring (127) is installed between the diaphragm fixing plate (126) and the connecting nozzle (113).

7. A new spring-type pressure gauge according to claim 6, characterized in that: A transparent cover (102) is mounted on the outer shell (101).

Images